NOISSUE - Update changelog for release 0.13.0 (#1595 )

Signed-off-by: dusanb94 <dusan.borovcanin@mainflux.com>
Update VerneMQ release (#1593 )
2026-08-07 15:25:48 +00:00 · 2022-04-15 15:51:35 +02:00 · 2022-04-15 15:25:39 +02:00 · 2022-04-15 12:37:55 +02:00 · 2022-04-11 13:52:20 +02:00 · 2022-03-30 16:52:10 +02:00
5371 changed files with 856169 additions and 381178 deletions
@@ -0,0 +1,6 @@
+.git
+.github
+build
+docker
+metrics
+scripts
@@ -1,88 +0,0 @@
-# Contributing to Mainflux
-
-The following is a set of guidelines for contributing to Mainflux and its libraries, which are
-hosted in the [Mainflux Organization](https://github.com/mainflux) on GitHub.
-
-This project adheres to the [Contributor Covenant 1.2](http://contributor-covenant.org/version/1/2/0).
-By participating, you are expected to uphold this code. Please report unacceptable behavior to
-[abuse@mainflux.com](mailto:abuse@mainflux.com).
-
-## Reporting issues
-
-Reporting issues is a great way to contribute to the project. We always appreciate a well-written,
-thorough bug reports.
-
-Prior to raising a new issue, check out [our issue
-list](https://github.com/mainflux/mainflux/issues) to determine whether it already include the
-problem you are facing.
-
-A good bug report shouldn't leave others needing to chase you up for more information. Please try to
-be as detailed as possible. The following questions might serve as a template for writing a detailed
-reports:
-
- What were you trying to achieve?
- What are the expected results?
- What are the received results?
- What are the steps to reproduce the issue?
- In what environment did you encounter the issue?
-
-## Pull requests
-
-Good pull requests (e.g. patches, improvements, new features) are a fantastic help. They should
-remain focused in scope and avoid containing unrelated commits.
-
-**Please ask first** before embarking any significant pull request (e.g. implementing new features,
-refactoring code etc.), otherwise you risk spending a lot of time working on something that the
-maintainers might not want to merge into the project.
-
-Please adhere to the coding conventions used throughout the project. If in doubt, consult the
-[Effective Go](https://golang.org/doc/effective_go.html) style guide.
-
-To start contributing to the project, [fork](https://help.github.com/articles/fork-a-repo/) it,
-clone your fork repository, and configure the remotes:
-
-```
-git clone https://github.com/<your-username>/mainflux.git
-cd mainflux
-git remote add upstream https://github.com/mainflux/mainflux.git
-```
-
-If you cloned a while ago, get the latest changes from upstream:
-
-```
-git checkout master
-git pull --rebase upstream master
-```
-
-Create a new topic branch from `master` using the naming convention `MF-[issue-number]`
-to help us keep track of your contribution scope:
-
-```
-git checkout -b MF-[issue-number]
-```
-
-Commit your changes in logical chunks. When you are ready to commit, make sure
-to write a Good Commit Message™. Consult the [Erlang's contributing guide](https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
-if you're not sure what constitutes a Good Commit Message™. Use [interactive rebase](https://help.github.com/articles/about-git-rebase)
-to group your commits into logical units of working before making them public.
-
-Note that every commit you make must be signed. By signing off your work you indicate that you
-are accepting the [Developer Certificate of Origin](https://developercertificate.org/).
-
-Use your real name (sorry, no pseudonyms or anonymous contributions). If you set your `user.name`
-and `user.email` git configs, you can sign your commit automatically with `git commit -s`.
-
-Locally merge (or rebase) the upstream development branch into your topic branch:
-
-```
-git pull --rebase upstream master
-```
-
-Push your topic branch up to your fork:
-
-```
-git push origin MF-[issue-number]
-```
-
-[Open a Pull Request](https://help.github.com/articles/using-pull-requests/) with a clear title
-and detailed description.
@@ -28,3 +28,13 @@ the following locations:
 5. In what environment did you encounter the issue?

 6. Additional information you deem important:
+
+**ENHANCEMENT**
+1. Describe the enhancement you are requesting. Enhancements include:
+   - tests
+   - code refactor
+   - documentation
+   - research
+   - tooling
+
+2. Indicate the importance of this enhancement to you (must-have, should-have, nice-to-have).
@@ -0,0 +1,15 @@
+Pull request title should be `MF-XXX - description` or `NOISSUE - description` where XXX is ID of issue that this PR relate to.
+Please review the [CONTRIBUTING.md](./CONTRIBUTING.md) file for detailed contributing guidelines.
+
+### What does this do?
+
+### Which issue(s) does this PR fix/relate to?
+Put here `Resolves #XXX` to auto-close the issue that your PR fixes (if such)
+
+### List any changes that modify/break current functionality
+
+### Have you included tests for your changes?
+
+### Did you document any new/modified functionality?
+
+### Notes
@@ -0,0 +1,26 @@
+name: Deploy GitHub Pages
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Swagger ui action
+        id: swagger-ui-action
+        uses: blokovi/swagger-ui-action@main
+        with:
+          dir: './api/openapi'
+          pattern: '*.yml'
+          debug: 'true'
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: swagger-ui
+          cname: api.mainflux.io
@@ -1,4 +1,8 @@
+# Copyright (c) Mainflux
+# SPDX-License-Identifier: Apache-2.0
+
+# Set your private global .gitignore:
+# https://digitalfortress.tech/tricks/creating-a-global-gitignore/
+
 build

-site/
-
@@ -0,0 +1,36 @@
+# Adopters
+
+As Mainflux Community grows, we'd like to keep track of Mainflux adopters to grow the community, contact other users, share experiences and best practices.
+
+To accomplish this, we created a public ledger. The list of organizations and users who consider themselves as Mainflux adopters and that **publicly/officially** shared information and/or details of their adoption journey(optional).
+Where users themselves directly maintain the list.
+
+## Adding yourself as an adopter
+If you are using Mainflux, please consider adding yourself as an adopter with a brief description of your use case by opening a pull request to this file and adding a section describing your adoption of Mainflux technology.
+
+**Please send PRs to add or remove organizations/users**
+
+### Format
+
+```
+N: Name of user (company or individual)
+D: Short Use Case Description (optional)
+L: Link with further information (optional)
+T: Type of adaptation: Evaluation, Core Technology, Production Usage (optional)
+```
+
+## Requirements
+* You must represent the user or organization listed. Do NOT add entries on behalf of other organizations or individuals.
+Pull request commit must be [signed](https://docs.github.com/en/github/authenticating-to-github/signing-commits) and auto-checked with [ Developer Certificate of Origin (DCO)](https://probot.github.io/apps/dco/)
+* There is no minimum requirement or adaptation size, but we request to list permanent deployments only, i.e., no demo or trial deployments. Commercial or production use is not required. A well-done home lab setup can be equally impressive as a large-scale commercial deployment.
+
+
+**The list of organizations/users that have publicly shared the usage of Mainflux:**
+
+**Note**: Several other organizations/users couldn't publicly share their usage details but are active project contributors and Mainflux Community members.
+
+
+## Adopters list (alphabetical)
+
+
+**Note:** The list is maintained by the users themselves. If you find yourself on this list, and you think it's inappropriate. Please contact [project maintainers](https://github.com/mainflux/mainflux/blob/master/MAINTAINERS) and you will be permanently removed from the list.
@@ -0,0 +1,708 @@
+# Mainflux Changelog
+
+## Generation
+Mainflux release notes for the latest release can be obtained via:
+```
+make changelog
+```
+
+Otherwise, whole log in a similar format can be observed via:
+```
+git log --pretty=oneline --abbrev-commit
+```
+
+## 0.13.0 - 15. APR 2022.
+### Features and Bugfixes
+- NOISSUE - Update changelog for release 0.13.0
+- Update VerneMQ release (#1593)
+- NOISSUE - Update changelog and readme for release 0.13.0
+- MF-1582 - Fix lora-adapter MQTT client (#1583)
+- NOISSUE - Fix CoAP adapter (#1572)
+- NOISSUE - Unify MF_INFLUX_READER_DB_HOST and MF_INFLUX_WRITER_DB_HOST envars (#1585)
+- MF-1580 - Influxdb Writer changes format of update-time to string (#1581)
+- MF-1575 Add 'Name' field to ListMembers response in things svc (#1576)
+- MF-1565 - Document Bearer, Thing and Basic Authorization header (#1566)
+- MF-1567 - Use Bearer, Thing or Basic scheme in Authorization header (#1568)
+- MF-1348 - Add transport errors logging (#1544)
+- NOISSUE - Add nats wrapper for COAP (#1569)
+- MF-1469 - Indicate proper authentication scheme in Authorization header (#1523)
+- MF-1240 - Return to service transport layer only service errors (#1559)
+- Update dependencies (#1564)
+- NOISSUE - Separate Keto hosts for read and write (#1563)
+- MF-1551 - Fix Cobra usage commands and clean unnecessary struct types (#1558)
+- MF-1257 - Access messages from readers endpoint with user access token (#1470)
+- NOISSUE - Refactor MQTT subscriber (#1561)
+- MF-1059 - Add TLS support for email (#1560)
+- MF-1261 - Use StatusUnauthorized for authn and StatusForbidden for authz (#1538)
+- NOISSUE - Fix auth members list response (#1555)
+- MF-1263 - Move repeating errors to the separate package (#1540)
+- NOISSUE - Add API keys functions to CLI (#1537)
+- Fix SDK for group members (#1553)
+- NOISSUE - Fix Swagger UI (#1552)
+- MF-1008 - Make token duration configurable (#1550)
+- MF-1308 - Use IETF Health Check standard (#1541)
+- Fix user listing access control (#1546)
+- Update dependencies (#1545)
+- MF-1478 - TimescaleDB writer and reader add-on (#1542)
+- MF-1149 - Add AsyncAPI MQTT API doc (#1539)
+- MF-1535 - Add API keys functions to SDK (#1536)
+- NOISSUE - Add view and list serials endpoints in certs service (#1483)
+- MF-1516 - Fix API key issuing (#1530)
+- NOISSUE - Add disconnect endpoint in nginx conf (#1528)
+- NOISSUE - Add timestamp transformation rules for specifc JSON fields (#1514)
+- MF-1425 - Support external UUIDs for Things and Channels (#1518)
+- MF-1521 - Fix email headers (#1522)
+- Fix SenML lib dependency version (#1519)
+- Bump vernemq to 1.12.3 (#1520)
+- NOISSUE - Remove auth URL from SDK (#1511)
+- NOISSUE - Apply policies to Channels (#1505)
+- remove dead code (#1503)
+- NOISSUE - Fix listing (#1502)
+- NOISSUE - Listing Policies (#1498)
+- Fix standalone mode (#1497)
+- MF-1489 - Add API for deleting policies (#1491)
+- NOISSUE - Update group sharing policies (#1494)
+- NOISSUE - Refactor InfluxDB Reader: explicit check event + add safe conversion (#1460)
+- NOISSUE - Update users create command for CLI (#1495)
+- NOISSUE - Update self register environment variable name (#1493)
+- Bring back the job add
+- NOISSUE - Fix assigning invalid group policy (#1487)
+- MF-1443 - Add policies (#1482)
+- NOISSUE - Fix retrieving all users (#1477)
+- MF-1468 - Fix ThingsURL in Certs Service (#1474)
+- NOISSUE - Refactor single-user mode (#1471)
+- Fix UpdateChannelHandler for Redis producer (#1473)
+- NOISSUE - Add SMPP notifier (#1464)
+- NOISSUE - Update dependencies (#1453)
+- NOISSUE - Fix security warnings for dependencies (#1452)
+- Bump docker-compose version in prereq (#1449)
+- NOISSUE - Fix bootstraping (#1448)
+- MF 1413 - Use per-service URL in SDK (#1444)
+- MF-1439 - Add support for Basic Authentication in HTTP Adapter (#1441)
+- MF-1421 - Make flattening of JSON transformer only available on InfluxDB (#1432)
+- NOISSUE - Update the /disconnect endpoint HTTP method as PUT (#1438)
+- MF-1389 - Add /disconnect endpoint in Things service (#1433)
+- NOISSUE - Fix httputil implementation in users service (#1434)
+- Fix fetching user members of an empty group (#1436)
+- Change to user friendly docs urls (#1430)
+- NOISSUE - Use github action for showing OpenAPI spec with Swagger UI (#1427)
+- Fix JSON Transformer empty format handling (#1429)
+- Update README
+- NOISSUE - Update docker-compose images to latest release (#1419)
+- MF-1378 - Update dependencies (#1379)
+
+## 0.12.1 - 05. MAY 2021.
+### Features and Bugfixes
+- NOISSUE - Refactor SDK memberships and fix openapi for memberships.
+- NOISSUE - Fix incorrect influxdb credentials
+- MF-1408 - Fix error handling for Thing update SQL(#1408)
+- MF-1288 - Add tests for JSON messages in message writers and readers
+- NOISSUE - Fix Postgres Reader order
+- NOISSUE - Fix nginx configuration for groups
+- NOISSUE - Add tests and connection route-map to lora-adapter
+- MF-1403 - Change vernemq building source revision
+- NOISSUE - Rm content-type check from list endpoint
+
+## 0.12.0 - 29. MAR 2021.
+### Features and Bugfixes
+- MF-1394 - SDK groups (#1396)
+- NOISSUE - fix response for passwd endpoints (#1393)
+- NOISSUE - dont retrieve groups (#1392)
+- MF-1368 - Add internal http api package for query params reading  (#1384)
+- MF-1390 - Fix docker-compose env_file (#1391)
+- NOISSUE - put order direction in response body (#1387)
+- NOISSUE - Certs service refactor (#1369)
+- MF-1357 - Add new endpoint for searching things (#1383)
+- NOISSUE - Add missing auth port in nginx enrypoint.sh (#1380)
+- MF-1346 - Create Groups API - add grouping of entities (#1334)
+- NOISSUE - Fix certs and vault deployment, reorganize and remove unnecessary vars (#1368)
+- MF-1317 - Configurable regexp rule for password (#1355)
+- Fix CoAP Adapter README (#1376)
+- NOISSUE - Fix default values for port and x509 provision (#1367)
+- NOISSUE - Added missing endpoints for users service (#1372)
+- MF-1365 - Add ADOPTERS.md file (#1371)
+- Fix grpc endpoint parameter permutation (#1370)
+- NOISSUE - Add IsChannelOwner grpc endpoint (#1366)
+- MF-1362 - Sort Things and Channels connections by name  (#1363)
+- MF-1314 - Add value comparison filters for readers (#1353)
+- Fix env configuration and documentation (#1360)
+- NOISSUE - Support disabling Email Agent authentication (#1356)
+- NOISSUE - Upgrade Mongo, Cassandra and Influx docker images (#1354)
+- NOISSUE - Add READMEs to pkg packages (#1352)
+- NOISSUE - Correct README (#1349)
+- MF-1342 - Use environment variables in docker-compose to use tagged version of image (#1343)
+- MF-1311 - Add Notifications service (#1324)
+- MF-1344 - Fix links to API documentations #1345
+- NOISSUE - Upgrade influxdb and postgres docker images (#1341)
+- NOISSUE - Revert cli to use user token from command args (#1339)
+- MF-1276 - Fix openapi IDs and Keys format (#1338)
+- MF-1061 - Add PageMetadata to readers (#1333)
+- NOISSUE - Fix run script and compiler warnings (#1336)
+- Fix Postgres writer transaction handling (#1335)
+- Make Transformer type configurable (#1331)
+- MF-1061 - Implement v, vb, vs, vd and from/to mongodb-reader filters (#1326)
+- NOISSUE - Rename package aliases uuidProvider into uuid (#1323)
+- MF-1034 - Wrapping MQTT client (#1318)
+- MF-1061 - Fix cassandra-reader count for json format (#1327)
+- MF-1061 - Implement v, vb, vs, vd and from/to cassandra-reader filters (#1325)
+- NOISSUE - Switch to Consumers interface (#1316)
+- MF-1061 - Implement protocol, name, v, vb, vs, vd and from/to Postgres reader… (#1322)
+- MF-1061 - Add name, protocol and publisher tests to influxdb-reader (#1320)
+- NOISSUE - Fix Auth typo (#1319)
+- NOISSUE - Add health check for MQTT broker (#1305)
+- MF-1264 - Add support for JSON readers (#1295)
+- NOISSUE - Merge authz and authn into new service auth (#1313)
+- MF-1061 - Implement InfluxDB filters value, v, vb, vs, vd, from, to (#1312)
+- NOISSUE - Correct readers openapi.yml (#1310)
+- NOISSUE - Fix MQTT Forwarder client id (#1309)
+- NOISSUE - Fix dates not being init properly on save, change path construction, replace UUID with ULID for group ID (#1300)
+- NOISSUE - Remove authz from docker comp (#1307)
+- Shorten descriptions and add formats (#1306)
+- NOISSUE - remove owner id from user table and object (#1303)
+- NOISSUE - Add missing fields to openapi specs and enclose http codes in single quotes (#1302)
+- MF-1290 - Sort Things and Channels by name (#1293)
+- MF-1248 - Add access policies for users (#1246)
+- Fixes, without spaces. (#1296)
+- Add different CNs for CA and certs (#1292)
+- MF-397 - Introduce Thing Groups (#1259)
+- Add Enhancement section to the issue template (#1284)
+- Fix hardcoded env var values (#1283)
+- NOISSUE - Improve AuthN service docs (#1282)
+- MF-1268 - CLI improvements (#1274)
+- NOISSSUE - Vault integration as an addon. (#1266)
+- Fix naming in Authn API tests (#1275)
+- MF-1244 - Return UserID alongside with user Email in Identify response (#1245)
+- NOISSUE - Fix ViewGroup and UpdateGroup (#1269)
+- NOISSUE - Add ListUsers, ViewUser and ViewProfile methods  (#1262)
+- NOISSUE - Rm users http package (#1256)
+- NOISSUE - Remove content-type check from decodeListUserGroupsRequest (#1255)
+- NOISSUE - Migrate swaggers to openapi 3 spec (#1250)
+- Update MQTT Broker Docker scripts (#1253)
+- update mproxy version (#1251)
+- NOISSUE - Fix group retrieval when parent id is not specified (#1247)
+- NOISSUE - Add new endpoint to retrieve configuration to be used as a template. (#1242)
+- NOISSUE - Add user groups (#1228)
+- MF-1237 - Return to transport only things service errors (#1236)
+- MF-928 - Change CoAP lib (#1233)
+- NOISSUE - Simplify make cleandocker (#1230)
+- NOISSUE - Fix malformed Swagger API specs (#1229)
+- MF-435 - Add support for env file loading (#1223)
+- update certs docs (#1227)
+- NOISSUE - Fix certs update in bootstrap config and make content handling in config.toml user friendly (#1221)
+- NOISSUE - Fix typo in authorization.js (#1226)
+- MF-983 - Add HTTP query param to connections list endpoints to fetch disconnected Things or Channels (#1217)
+- MF-1179 - Add a certificate service and certs endpoint to SDK (#1188)
+- NOISUE - Fix cache error when key is not in Redis (#1220)
+- MF-1199 - Add NATS messaging tests (#1209)
+- NOISSUE: Fix emailer (#1219)
+- NOISSUE - Update dependencies (#1218)
+- NOISSUE - Add subtopic wildcard for twin attribute's definition (#1214)
+- fix envs for nginx (#1215)
+- Remove twin mqtt related obsolete var and fix es-redis address (#1213)
+- NOISSUE - Remove unused `MF_THINGS_SECRET` env var (#1211)
+- NOISSUE - Fix some typos (#1212)
+- NOISSUE - Remove unknown Bootstrap requests (#1210)
+- NOISSUE - Use `pgcrypto` instead `uuid-ossp` for UUIDs generation (version 4) (#1208)
+- MF-1198 - Add errors package tests (#1207)
+- MF-1025 - timeout env in sec, use parseduration (#1206)
+- MF-1201 - Fix MF_THINGS_AUTH_GRPC_URL mongo reader ENVAR (#1203)
+- NOISSUE - Fix CI (#1204)
+- MF-1180 - Add redis based twins and states cache (#1184)
+- MF-739 - Add ID to the User entity (#1152)
+- NOISSUE - Fix default db name for storage databases (#1194)
+- NOISSUE - Add `MF_DOCKER_IMAGE_NAME_PREFIX` to Makefile (#1173)
+- MF-1154 - Move UUID provider to project root (#1172)
+- Fix typo in error messages (#1193)
+- MF-1190 - Add pkg for library packages (#1191)
+- MF-1177 - Implement caching in MQTT adapter (#1187)
+- NOISSUE - Refactor provision tool (#1189)
+
+## 0.11.0 - 29. MAY 2020.
+### Features and Bugfixes
+- Add VerneMQ docker image build from source (#1178)
+- MF-994 - Add tracing middleware for twins and states repos (#1181)
+- MF-995 - Add Twins tests for endpoint list twins and list states (#1174)
+- NOISSUE - Update dependencies (#1176)
+- MF-1163 - Fix influxdb-reader to use nanoseconds precision (#1171)
+- Rename environment variable MF_MQTT_ADAPTER_PORT to MF_MQTT_ADAPTER_MQTT_PORT in docker environment (#1170)
+- Remove thing related code from twins service (#1169)
+- MF-997 - Add twins service swagger file (#1167)
+- MF-1079 - Add MQTT forwarder (#1164)
+- MF-1159 - add gateway metadata update in provision method (#1160)
+- MF-1055 - rollback/release transaction on error (#1166)
+- NOISSUE - Use log level error for VermeMQ docker (#1162)
+- NOISSUE - Fix default nats pubsub subject (#1153)
+- MF-1125 - Document Provision service (#1143)
+- NOISSUE - Fix bootstrap SDK args naming (#1151)
+- Use VerneMQ default log level (#1150)
+- NOISSUE - Update provision service (#1133)
+- NOISSUE - Refactor messaging (#1141)
+- Add JSON tags to SDK entities (#1146)
+- NOISSUE - Update CLI README.md (#1139)
+- NOISSUE - Update mProxy version (#1137)
+- fix nginx, channel connect (#1136)
+- Remove concurrency flag for golangci-lint (#1134)
+- MF-1088 - Remove message payload content type (#1121)
+- MF-1129 - Use snake_case for Lora and OPC-UA metadata fields (#1130)
+- MF-1128 - Add golangci-linter to a CI script (#1131)
+- MF-1123 - Move Provision service to monorepo (#1132)
+- MF-845 - Add FOSSA badge for licensing (#1127)
+- MF-1087 - Remove WebSocket adapter (#1120)
+- NOISSUE - Use HTTP Status in SDK error messages (#1119)
+- NOISSUE - Fix bootstrap token naming and interfaces named args (#1117)
+- MF-1115 - Improve the SDK error encoding (#1118)
+- MF-862 - Add boostrap CRUD to SDK and CLI (#1114)
+- NOISSUE - Update coding style in Things service (#1116)
+- NOISSUE - Remove defers from TestMain (#1111)
+- NOISSUE - Create func to encode SDK errors (#1110)
+- MF-1078 - Add timestamp to published messages and use it in Transformer (#1106)
+- Fix prometheus namespace in postgres reader & writer (#1109)
+- NOISSUE - Implement errors package in senml transformer, readers and writers (#1108)
+- NOISSUE - Implement errors package in Authentication service (#1105)
+- MF-1103 - API key should ignore empty expiration time (#1104)
+- MF-1096 - Fix AuthN and Things Auth ENVARS (#1066)
+- fix Contains function for nil arguments (#1102)
+- MF-1099 - Add email subdomain validator (#1101)
+- MF-1091 - Use channels. as broker prefix (#1098)
+- MF-1090 - Use named Interfaces args (#1097)
+- NOISSUE - Create broker package for NATS (#1080)
+- NOISSUE - Implement errors package in bootstrap service (#1093)
+- NOISSUE - Fix writers loadSubjectsConfig if file is missing (#1094)
+- NOISSUE - Adding subtopics filtering in writer services (#1072)
+- NOISSUE - Improve errors package (#1086)
+- NOISSUE - Enable MQTT over WS in docker composition (#1085)
+- NOISSUE - Rm unused opc-ua envars (#1083)
+- MF-798 - Add utf8 support for email validation (#1082)
+- Remove unused Tokenizer interface (#1084)
+- Update mqtt adapter imports (#1081)
+- NOISSUE - Update state based on SenML time value (#1075)
+- NOISSUE - Fix StatusBadDecodingError for opc-ua browse (#1074)
+- Save senml array msg to multiple states (#1073)
+- NOISSUE - Fix opc-ua message type handling (#1071)
+- NOISSUE - Add Publisher field to MQTT adapter (#1067)
+- NOISSUE - Fix users CLI (#1062)
+- NOISSUE - Fix SDK Messages response (#1064)
+- Merged MQTT docker compose in core composition file (#1060)
+- MF-1016 - Add UserUpdate and UpdatePassword to sdk and CLI (#1057)
+- Update mProxy (#1058)
+- MF-1053 - Add disconnect event to MQTT adapter (#1056)
+- Fix data type for data_value in databases (#1054)
+- NOISSUE - Fix opc-ua subscriptions store (#1052)
+- NOISSUE - Fix connect CLI command and remove ConnectThing func from SDK (#1051)
+- NOISSUE - Update Vernemq image repository (#1050)
+- Removed VerneMQ auth plugin, Aedes impl. Added mproxy support in docker (#1049)
+- NOISSUE - Add default subscription nodeID and Interval ENVAR (#1046)
+- MF-415 - Merge mProxy support  (#1045)
+- NOISSUE - Remove twins-service mqtt dependency and publish notifs to nats (#1042)
+- Add arbitrary SenML value type saving to twin state (#1039)
+- Fixed Aedes dependencies (#1036)
+- MF-998 - Add Twins service to Makefile and docker-compose.yml (#1035)
+- MF-1032 - Fix redis docker volume of opcua-adapter (#1033)
+- NOISSUE - add nats conf (#1031)
+- MF-442 - Add SSL encryption to the MongoDB, InfluxDB and Cassanda readers (#1024)
+- NOISSUE - Add opc-ua type handling and unsubscription (#1029)
+- NOISSUE - Add aggregate attribute-based search for twin retrieval (#1027)
+- NOISSUE - Fix metadata in add Things endpoint (#1028)
+- NOISSUE - Fix minimal password length (#1023)
+- MF-1020 - Change default password for CLI provision test (#1021)
+- NOISSUE - Add subtopic to opcua messages (#1022)
+- NOISSUE - Add details to browsed OPC-UA nodes (#1019)
+- NOISSUE Fix obsolete attribute persistance (#1018)
+- Fix twins update revision counter (#1011)
+- Fixed docs instructions in README (#1010)
+- Fix copyright year (#1009)
+- Fix issuing recovery key (#1007)
+- Removed gatling load-test (#1005)
+- Removed old k8s manifests (#1004)
+- NOISSUE - Remove UI from docker-compose (#1001)
+- NOISSUE - Store successfull OPC-UA subscriptions (#999)
+- MF-730 - Add digital twin service for things (#855)
+- Fix Redis event naming (#996)
+- NOISSUE - Add a Browse endpoint in opcua-adapter (#988)
+- NOISSUE - Add Redis ES Username/Pass for VerneMQ (#991)
+- MF-982 - Add error when connecting empty channels or things (#985)
+
+## 0.10.0 - 17. DEC 2019.
+### Features
+- MF-932 - User API keys (#941)
+- NOISSUE - Use opcua server timestamp in opcua-adapter messages (#980)
+- Simplify CI script (#979)
+- NOISSUE - Add opcua-adapter conn route-map, use ServerURI and NodeID (#975)
+- Move docs to a separate repo (#976)
+- NOISSUE - Support multiple types values in opcua-adapter (#973)
+- Migrate from dep to go modules (#971)
+- NOISSUE - Add Node IdentifierType config in opcua-adapter (#967)
+- NOISSUE - Remove messages limit in influxdb-reader (#968)
+- MF-898 - Add bulk connect to CLI and SDK (#956)
+- MF-538 - Improve logging and API errors (#866)
+- NOISSUE - Remove Elm UI (#953)
+- MF-898 - Add bulk connections endpoint (#948)
+- MF-898 - Change thing's service to use bulk connect (#946)
+- MF-898 - Add transactions to postgres connect (#940)
+- Add missing user service tests (#945)
+- Remove Normalizer service from compose (#937)
+- MF-919 - Mainflux message updates (#924)
+- NOISSUE - Remove ARM multi-arch images (#929)
+- MF-906 - Change single creation endpoints to use bulk service calls (#927)
+- MF-922 - Add UpdateUser endpoint (#923)
+- MF-780 - Use Normalizer as a lib (#915)
+- NOISSUE - Switch to grpcbox for VerneMQ (#914)
+- Change channels to chs (#918)
+- MF-484 - Add bulk provisioning for things and channels (#889)
+- MF-899 - Update README and official docs (#910)
+- NOISSUE - Fix Redis envars (#903)
+- Add disconnect on gen_server terminate() (#913)
+- MF-890 - Add OPC-UA docs  (#904)
+- NOISSUE - Update Protobuf version (#902)
+- MF-886 - Add OPC-UA adapter (#878)
+- MF-532 - Password reset (#873)
+- MF-785 - Change CanAccess to CanAccessByKey (#894)
+- NOISSUE - Add MQTT UserName check on register and InstanceId in Redis (#884)
+- Add MQTT troubleshooting section (#882)
+- MF-875 - Add tracing to official documentation (#877)
+- MF-788 - Remove date and minimize copyright comments (#876)
+- MF-787 - Add tags to user, thing, and channel spans (#869)
+- Update docker-compose version for addons (#874)
+- MF-859 - Channels metadata search (#867)
+- MF-858 Users metadata (#861)
+- NOISSUE - Simplify MQTT benchmarking tool (#852)
+- NOISSUE - Upgrade Go version to 1.13 in container images (#868)
+- MF-820 - Fetch messages for a particular device (#843)
+- Update gorilla websocket version (#865)
+- NOISSUE - Update aedes version and fix Dockerfile (#863)
+- NOISSUE - Search by metadata (#849)
+- MF-846 - Install python in docker build for aedes mqtt image (#860)
+- NOISSUE - Clean NginX files, move .gitignores to dirs (#853)
+- NOISSUE - Add docker-compose for MQTT cluster (#841)
+- Add debug logs to the WS adapter (#848)
+- NOISSUE - Add measuring time from pub to sub (#839)
+- NOISSUE - update mqtt prov tool and some refactor (#831)
+- NOISSUE - Use Thing ID to update certs data (#827)
+- NOISSUE - Improve VerneMQ plugin code, add configurable gRPC pool size (#836)
+- NOISSUE - Use gRPC for VerneMQ (#835)
+- Switch secure of WS connection according to secure of http connection of UI (#829)
+- NOISSUE - Use current hostname instead of localhost for a WebSocket connection in the UI (#826)
+- NOISSUE - Improve MQTT benchmarking tools (#828)
+- NOISSUE - update mqtt benchmark (#824)
+- Add encryption key to env vars table (#823)
+- NOISSUE - Add version endpoint to MQTT adapter (#816)
+- MF-295 add mqtt benchmark tool (#817)
+- update mqtts commands (#815)
+- NOISSUE - Support encrypted bootstrap (#796)
+- Add config to writers docs (#812)
+- NOISSUE - Add VerneMQ support (#809)
+- NOISSUE - Add content type as part of MQTT subscription topic (#810)
+
+### Bugfixes
+- Fix MQTT protobuf filename(#981)  
+- MF-950 - Runtime error in normalizer - CBOR SenML (#974)
+- NOISSUE - Fix opcua-adapter events warnings (#965)
+- NOISSUE - Fix opcua-adapter events decode (#951)
+- Fix subtopic handling in VerneMQ (#962)
+- NOISSUE - Fix Update User (#959)
+- NOISSUE - Fix make dockers (#957)
+- Add dev_ back to make dockers_dev (#955)
+- NOISSUE - Fix docs (#952)
+- MF-916 - Fix Things and Channels counters (#947)
+- MF-942 - Fix email template logic  (#944)
+- NOISSUE - Fix HTTP header for Things and Channels creation (#939)
+- NOISSUE - Fix docker ui image name (#938)
+- NOISSUE - Fix lora-adapter (#936)
+- NOISSUE - Fix lora creation events (#933)
+- Fix doc for ENV vars in README (#920)
+- Fix compilation (#911)
+- Revert "NOISSUE - Make event sourcing optional (#907)" (#909)
+- NOISSUE - Make event sourcing optional (#907)
+- NOISSUE - Fix InfluxDB env vars (#908)
+- Fix Elm version for ARM Docker images (#905)
+- Fix Elm version in Dockerfile (#901)
+- NOISSUE - fix security doc (#897)
+- NOISSUE - Fix typo in docs and README (#891)
+- Fix Nginx mTLS configuration (#885)
+- Fix provision tool connect error handling (#879)
+- Fix: Correct 404 and Content-Type Issues in MQTT Version Endpoint (#837)
+- NOISSUE - Fix proto files in VerneMQ (#834)
+- NOISSUE - Fix hackney HTTP request (#833)
+- Add socket pool and fix pattern matching (#830)
+- Fix typo (#814)
+
+## 0.9.0 - 19. JUL 2019.
+### Features
+- Create and push docker manifest for new release from Makefile (#794)
+- MF-399 - Add open tracing support (#782)
+- MF-783 - Allow access checking by a thing ID (#784)
+- NOISSUE - Add authorization HTTP API to things service (#772)
+- Remove cli executable from repo (#776)
+- NOISSUE - Use .env vars in docker-compose (#770)
+- MF-663 - enable nginx port conf from docker env (#769)
+- Update docs (#766)
+- NOISSUE - Remove installing non-existent package in ci (#758)
+-  NOISSUE - Add searchable Channels name  (#754)
+- MF-466 - ARM docker deployment (#756)
+- Add missing Websocket.js into docker ui image (#755)
+- NOISSUE - Add searchable Things name (#750)
+- NOISSUE - Add certificate fields to the Bootstrap service (#752)
+- Update grpc and protobuf deps in mqtt adapter (#751)
+- MF-742 - Things to support single user scenario (#749)
+- MF-732 - Add Postgres reader (#740)
+- MF-722 - Change UUID lib (#746)
+- Add performance improvement to writer filtering (#744)
+- NOISSUE - Update nginx version (#748)
+- MF-574 - Add missing environment variables to Cassandra writer (#745)
+- NOISSUE - Add compile test to CI (#743)
+- MF-708 - Assign Writer(s) to a channel (#737)
+- MF-732 - Add PostgreSQL writer (#733)
+- NOISSUE - Add readers pagination in SDK (#736)
+- Add UI websocket open/close and send/receive (#728)
+- MF-707 - Allow custom Thing key (#726)
+- MF-525 - Add pagination response to the readers (#729)
+- NOISSUE - Rm Things type from lora-adapter (#727)
+- skip deleting of persistent volumes by default (#723)
+- MF-488 - Remove Thing type (app or device) (#718)
+- Remove empty channels check (#720)
+- MF-655 Proper usage of docker volumes (#657)
+- NOISSUE - Improve UI styling (#719)
+- MF-715 - Conflict on updating connection with a valid list of channels (#716)
+- MF-711 - Create separate Redis instance for ES (#717)
+- NOISSUE - Update event fields naming (#713)
+- MF-698 - Add missing info and docs about sys event sourcing (#712)
+- MF-549 - Change metadata format from JSON string to JSON object (#706)
+- NOISSUE - Replace repeating code by card gen func (#697)
+- Update Bootstrap service docker-compose.yml (#700)
+- Remove Debug function (#699)
+- MF-687 - Add event sourcing to Bootstrap service (#695)
+- NOISSUE - Remove debugging message from response of handle error function (#696)
+- Add event stream to MQTT adapter for conn status (#692)
+- NOISSUE - Improve UI style (#691)
+- Update docs structure (#686)
+- Use images instead of carousel (#685)
+- NOISSUE - Update docs (#683)
+- MF-662 - Change menu style (#678)
+- MF-651 - X509 Mutual TLS authentication (#676)
+- Update Aedes version for MQTT adapter (#677)
+- MF-661 - Bootstrap pagination in UI (#672)
+- Update subtopics section in documentation (#670)
+- Remove default base URL value (#671)
+
+### Bugfixes
+- NOISSUE - Fix Readers logs (#735)
+- NOISSUE - Fix Docker for ARM (#760)
+- NOISSUE - Fix count when search by name is performed (#767)
+- NOISSUE - Typo fix (#777)
+- NOISSUE - Fix Postgres logs in Things service (#734)
+- Fix CI with fixed plugin versions (#747)
+- fix building problems (#741)
+- fix docker-compose env (#775)
+- Fix MF_THINGS_AUTH_GRPC_PORT in addons' docker-compose files (#781)
+- Fix MQTT raw message deserialization (#753)
+- fix variant option for manifest annotate (#765)
+- fix to makefile for OSX/Darwin (#724)
+- Fix .dockerignore file by removing index.html (#725)
+- Fix things and channels metadata create and edit & remove thing type (#721)
+- Fix Bootstrap service event map keys (#705)
+- Fix logging in publish event callback (#694)
+- Fix InfluxDB time bug (#689)
+- Fix users service to work in offline mode (#795)
+- fix mainflux_id parameter in bootstrap swagger (#789)
+- Fix offset calculation after deleting thing/channel, not to go to negative offset after deleting last thing/channel (#679)
+- Use errors and null packets in authorized pub/sub (#773)
+- NOISSUE - Fix CoAP adapter (#779)
+
+
+### Summary
+https://github.com/mainflux/mainflux/milestone/10?closed=1
+
+## 0.8.0 - 20. MAR 2019.
+### Features
+- MF-571 - Add Env.elm to set custom base URL (#654)
+- NOISSUE Added docs about docker-compose config overriding (#653)
+- MF-539 - Improve Bootstrap Service documentation (#646)
+- MF-596 - Add subtopic to RawMessage (#642)
+- NOISSUE - Prevent infinite loop in lora-adapter if Redis init fail (#647)
+- Corrected grammar and rephrased a few sentences to read nicely (#641)
+- MF-571 - Elm UI (#632)
+- MF-552 - Use event sourcing to keep Bootstrap service in sync with Things service (#603)
+- MF-540 - Add pagination in API responses for Bootstrap service (#575)
+- MF-600 - Handle custom LoRa Server application decoder (#608)
+- update docker-compose (#590)
+- Update generated code (#602)
+- Add generated files check (#601)
+- MF-597 - Removed legacy code as not needed anymore (#598)
+- NOISSUE - Added normalizer service to run script (#594)
+- Changed RawMessage (#587)
+- NOISSUE - fix CLI log (#581)
+- MF-519 - Refine Message (#567)
+- NOISSUE - Add name field for Bootstrap Config (#564)
+- Fix non-SenML message routing in normalizer (#573)
+- NOISSUE - Update authors list (#569)
+- Update lora.md (#568)
+- NOISSUE- Improve LoRa doc (#562)
+- MF-551 - Add metadata fields to Bootstrap Channels (#563)
+- Fix MQTT adapter by setting subscription queue (#561)
+- MF-558 - Add MQTT subtopics documentation (#559)
+- Fix regexp for SUB (#557)
+- Simplify MQTT topipc regexp (#555)
+- MF-429 -Enabled MQTT subtopic's (#554)
+- Add env var for number of concurrent messages (#545)
+- NOISSUE - Update doc and fix empty key bug (#544)
+- MF-370 - Simplify and refine CI (#541)
+- NOISSUE - Add connection commands to CLI (#542)
+- NOISSUE - Refine docs (#537)
+- Update licnese year (#533)
+- MF-513 - Add Bootstrapping service (#524)
+- Add dedicated env vars for event sourcing (#536)
+- NOISSUE - Fix docs (#535)
+- Add lora doc to getting-started.md (#529)
+- MF-483 - Enable channels and devices corresponding lists in backend (#520)
+- Add missing components doc to architecture.md (#531)
+
+### Bugfixes
+- MF-639 Split Content-Type header field on semicolon and evaluate all substrings (#644)
+- MF-656 - Change bootstrap service port to 8200 (#658)
+- Replace crossOrigin with relative path and fix messaging bug (#645)
+- MF-579 Things & Channels returns 404 when not found or ID is malformed, not 500 (#633)
+- Fix run command in dev guide (#605)
+- MF-583 - Correct cmd/mongodb-reader HTTPServer log Info (#584)
+- Fix Dusan Maldenovic GitHub (#570)
+- Fix CLI docs (#566)
+- Fix pagination response for empty page (#547)
+- Fix swagger and provisioning docs (#546)
+- NOISSUE - Fix event sourcing client on LoRa adapter (#527)
+- Fix MQTT adapter scaling issue (#526)
+- NOISSUE - Fix subtopic regex and restrict empty subtopic parts (#659)
+- Fix missing css in container ui (#638)
+- NOISSUE - Fix lora-adapter Object decode (#610)
+- NOISSUE - Fix users logs in main.go (#577)
+- NOISSUE - Fix normalizer exposed port in docker-compose (#548)
+
+### Summary
+https://github.com/mainflux/mainflux/milestone/9?closed=1
+
+
+## 0.7.0 - 08. DEC 2018.
+### Features
+
+- MF-486 - Add provisioning command to CLI (#487)
+- Fix lora-adapter event store handlers (#492)
+- NOISSUE - Add LoRa route map validation and fix LoRa messages URL (#491)
+- MF-475 - Replace increment ID with UUID (#490)
+- MF-166 - Add lora-adapter service (#481)
+- NOISSUE - Add Makefile target to clean old imgs (#485)
+- MF-473 -  Add metadata field to channel (#476)
+- Make CoAP ping period configurable (#469)
+- Add nginx ingress config to k8s services (#472)
+- Add CoAP section in getting-started (#468)
+- NOISSUE - Move CLI documentation from getting started guide to separate page (#470)
+- NOISSUE - Update Getting Started doc with CLI usage (#465)
+- Update CoAP docs with URL example (#463)
+- MF-447 - Add event sourcing to things service (#460)
+- Add TLS support to CoAP adapter and all readers (#459)
+- MF-417 - Implement SDK tests (#438)
+- MF-454 - Use message Time field as a time for InfluxDB points (#455)
+- NOISSUE - Add .dockerignore to project root (#457)
+- Update docker-compose so that every service has debug log level (#453)
+- NOISSUE - Add TLS flag for Mainflux services (#452)
+- MF-448 - Option for Postgres SSL Mode (#449)
+- MF-443 Update project dependencies (#444)
+- MF-426 - Add optional MF_CA_CERTS env variable to allow GRPC client to use TLS certs (#430)
+- Expose the InfluxDB and Cassandra ports to host (#441)
+- MF-374 - Bring back CoAP adapter (#413)
+
+### Bugfixes
+- gRPC Load Balancing between http-adapter and things (#387)
+- MF-407 - Values of zero are being omitted  (#434)
+
+### Summary
+https://github.com/mainflux/mainflux/milestone/8?closed=1
+
+
+## 0.6.0 - 26. OCT 2018.
+### Features
+
+- Added Go SDK (#357)
+- Updated NATS version (#412)
+- Added debbug level to MFX logger (#379)
+- Added Documentation for readers (#389)
+- Added Redis cache to improve performance (#382)
+
+
+## 0.5.1 - 05. SEP 2018.
+### Features
+- Improve performance by adding Redis cache (#382)
+
+### Bugfixes
+- Mixed up name and type of the things (#375)
+- Fix MQTT topic (#380)
+
+
+## 0.5.0 - 28. AUG 2018
+### Features
+- InfluxDB Reader (#311)
+- Cassandra Reader (#313)
+- MongoDB Reader (#344)
+- MQTT Persistance via Redis (#328)
+- CLI integrated into monorepo (#216)
+- Normalizer logging (#333)
+- WS swagger doc (#337)
+- Payload renamed to Metadata (#343)
+- Protobuf files added (#363)
+- SPDX headers added (#325)
+
+### Bugfixes
+- Docker network for InfluxDB (#346)
+- Vendor correct gRPC version (#340)
+
+### Summary
+https://github.com/mainflux/mainflux/milestone/6?closed=1
+
+
+## 0.4.0 - 01. JUN 2018.
+* Integrated MQTT adapter (#165 )
+* Support for storing messages in MongoDB (#237)
+* Support for storing messages in InfluxDB (#236)
+* Use UUID PKs with auto-incremented values (#269 )
+* Replaced JWT with plain string tokens in things service (#268 )
+* Emit non-SenML messages (#239 )
+* Support for Grafana (#296)
+* Added WS Load test (#299 )
+
+
+## 0.3.0 - 14. MAY 2018.
+- CoAP API for message exchange (#186)
+- Split `manager` service into `clients` and `users` (#266)
+- Replaced ORM with raw SQL (#265)
+- Setup Kubernetes (#226, #273)
+- Fix docker compose (#274)
+- Integrated `dashflux` into monorepo (#258)
+- Integrated (*non-compatible*) `mqtt` into monorepo (#260)
+
+
+## 0.2.3 - 24. APR 2018.
+- Fix examples in the documentation (#243)
+- Add service name in info response (#241)
+- Improve code coverage in WS adapter (#242)
+
+
+## 0.2.2 - 23. APR 2018.
+- Setup load testing scenarios (#225)
+
+
+## 0.2.1 - 22. APR 2018.
+- Fixed `Content-Type` header checking (#238)
+
+## 0.2.0 - 18. APR 2018
+- Protobuf message serialization (#192)
+- Websocket API for exchanging messages (#188)
+- Channel & client retrieval paging (#227)
+- Service instrumentation (#213)
+- `go-kit` based JSON logger (#212)
+- Project documentation (#218, #220)
+- API tests (#211, #224)
+
+
+## 0.1.2 - 18. MAR 2018.
+### Bug fixes
+
+- Fixed go lint warnings (#189)
+- Compose failing startup (#185)
+- Added missing service startup messages (#190)
@@ -0,0 +1,87 @@
+# Contributing to Mainflux
+
+The following is a set of guidelines to contribute to Mainflux and its libraries, which are
+hosted on the [Mainflux Organization](https://github.com/mainflux) on GitHub.
+
+This project adheres to the [Contributor Covenant 1.2](http://contributor-covenant.org/version/1/2/0).
+By participating, you are expected to uphold this code. Please report unacceptable behavior to
+[abuse@mainflux.com](mailto:abuse@mainflux.com).
+
+## Reporting issues
+
+Reporting issues are a great way to contribute to the project. We are perpetually grateful about a well-written,
+thorough bug report.
+
+Before raising a new issue, check [our issue
+list](https://github.com/mainflux/mainflux/issues) to determine if it already contains the
+problem that you are facing.
+
+A good bug report shouldn't leave others needing to chase you for more information. Please be as detailed as possible. The following questions might serve as a template for writing a detailed
+report:
+
+- What were you trying to achieve?
+- What are the expected results?
+- What are the received results?
+- What are the steps to reproduce the issue?
+- In what environment did you encounter the issue?
+
+## Pull requests
+
+Good pull requests (e.g. patches, improvements, new features) are a fantastic help. They should
+remain focused in scope and avoid unrelated commits.
+
+**Please ask first** before embarking on any significant pull request (e.g. implementing new features,
+refactoring code etc.), otherwise you risk spending a lot of time working on something that the
+maintainers might not want to merge into the project.
+
+Please adhere to the coding conventions used throughout the project. If in doubt, consult the
+[Effective Go](https://golang.org/doc/effective_go.html) style guide.
+
+To contribute to the project, [fork](https://help.github.com/articles/fork-a-repo/) it,
+clone your fork repository, and configure the remotes:
+
+```
+git clone https://github.com/<your-username>/mainflux.git
+cd mainflux
+git remote add upstream https://github.com/mainflux/mainflux.git
+```
+
+If your cloned repository is behind the upstream commits, then get the latest changes from upstream:
+
+```
+git checkout master
+git pull --rebase upstream master
+```
+
+Create a new topic branch from `master` using the naming convention `MF-[issue-number]`
+to help us keep track of your contribution scope:
+
+```
+git checkout -b MF-[issue-number]
+```
+
+Commit your changes in logical chunks. When you are ready to commit, make sure
+to write a Good Commit Message™. Consult the [Erlang's contributing guide](https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
+if you're unsure of what constitutes a Good Commit Message™. Use [interactive rebase](https://help.github.com/articles/about-git-rebase)
+to group your commits into logical units of work before making it public.
+
+Note that every commit you make must be signed. By signing off your work you indicate that you
+are accepting the [Developer Certificate of Origin](https://developercertificate.org/).
+
+Use your real name (sorry, no pseudonyms or anonymous contributions). If you set your `user.name`
+and `user.email` git configs, you can sign your commit automatically with `git commit -s`.
+
+Locally merge (or rebase) the upstream development branch into your topic branch:
+
+```
+git pull --rebase upstream master
+```
+
+Push your topic branch up to your fork:
+
+```
+git push origin MF-[issue-number]
+```
+
+[Open a Pull Request](https://help.github.com/articles/using-pull-requests/) with a clear title
+and detailed description.
@@ -1,573 +0,0 @@
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-  packages = ["proto"]
-  revision = "1adfc126b41513cc696b209667c8656ea7aac67c"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/golang/protobuf"
-  packages = [
-    "proto",
-    "ptypes",
-    "ptypes/any",
-    "ptypes/duration",
-    "ptypes/timestamp"
-  ]
-  revision = "b4deda0973fb4c70b50d226b1af49f3da59f5265"
-  version = "v1.1.0"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/golang/snappy"
-  packages = ["."]
-  revision = "2e65f85255dbc3072edf28d6b5b8efc472979f5a"
-
-[[projects]]
-  name = "github.com/gorilla/websocket"
-  packages = ["."]
-  revision = "ea4d1f681babbce9545c9c5f3d5194a789c89f5b"
-  version = "v1.2.0"
-
-[[projects]]
-  name = "github.com/hailocab/go-hostpool"
-  packages = ["."]
-  revision = "e80d13ce29ede4452c43dea11e79b9bc8a15b478"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/hokaccha/go-prettyjson"
-  packages = ["."]
-  revision = "e6b9231a2b1cc5798b336fdbf99c16cd8ad1e0c9"
-
-[[projects]]
-  name = "github.com/inconshreveable/mousetrap"
-  packages = ["."]
-  revision = "76626ae9c91c4f2a10f34cad8ce83ea42c93bb75"
-  version = "v1.0"
-
-[[projects]]
-  name = "github.com/influxdata/influxdb"
-  packages = [
-    "client/v2",
-    "models",
-    "pkg/escape"
-  ]
-  revision = "02d7d4f043b34ecb4e9b2dbec298c6f9450c2a32"
-  version = "v1.5.2"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/kr/logfmt"
-  packages = ["."]
-  revision = "b84e30acd515aadc4b783ad4ff83aff3299bdfe0"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/lib/pq"
-  packages = [
-    ".",
-    "oid"
-  ]
-  revision = "d34b9ff171c21ad295489235aec8b6626023cd04"
-
-[[projects]]
-  name = "github.com/mattn/go-colorable"
-  packages = ["."]
-  revision = "167de6bfdfba052fa6b2d3664c8f5272e23c9072"
-  version = "v0.0.9"
-
-[[projects]]
-  name = "github.com/mattn/go-isatty"
-  packages = ["."]
-  revision = "0360b2af4f38e8d38c7fce2a9f4e702702d73a39"
-  version = "v0.0.3"
-
-[[projects]]
-  name = "github.com/matttproud/golang_protobuf_extensions"
-  packages = ["pbutil"]
-  revision = "3247c84500bff8d9fb6d579d800f20b3e091582c"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/mongodb/mongo-go-driver"
-  packages = [
-    "bson",
-    "bson/builder",
-    "bson/decimal",
-    "bson/elements",
-    "bson/objectid",
-    "bson/parser",
-    "bson/parser/ast",
-    "core/address",
-    "core/auth",
-    "core/auth/internal/gssapi",
-    "core/command",
-    "core/compressor",
-    "core/connection",
-    "core/connstring",
-    "core/description",
-    "core/dispatch",
-    "core/event",
-    "core/option",
-    "core/readconcern",
-    "core/readpref",
-    "core/result",
-    "core/session",
-    "core/tag",
-    "core/topology",
-    "core/uuid",
-    "core/version",
-    "core/wiremessage",
-    "core/writeconcern",
-    "internal",
-    "mongo",
-    "mongo/aggregateopt",
-    "mongo/changestreamopt",
-    "mongo/clientopt",
-    "mongo/collectionopt",
-    "mongo/countopt",
-    "mongo/dbopt",
-    "mongo/deleteopt",
-    "mongo/distinctopt",
-    "mongo/dropcollopt",
-    "mongo/findopt",
-    "mongo/indexopt",
-    "mongo/insertopt",
-    "mongo/listcollectionopt",
-    "mongo/listdbopt",
-    "mongo/mongoopt",
-    "mongo/replaceopt",
-    "mongo/runcmdopt",
-    "mongo/updateopt"
-  ]
-  revision = "8df56f107cdd485351eb2523992c3364114b4b2e"
-  version = "v0.0.10"
-
-[[projects]]
-  name = "github.com/nats-io/go-nats"
-  packages = [
-    ".",
-    "encoders/builtin",
-    "util"
-  ]
-  revision = "062418ea1c2181f52dc0f954f6204370519a868b"
-  version = "v1.5.0"
-
-[[projects]]
-  name = "github.com/nats-io/nuid"
-  packages = ["."]
-  revision = "289cccf02c178dc782430d534e3c1f5b72af807f"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/opencontainers/go-digest"
-  packages = ["."]
-  revision = "279bed98673dd5bef374d3b6e4b09e2af76183bf"
-  version = "v1.0.0-rc1"
-
-[[projects]]
-  name = "github.com/opencontainers/image-spec"
-  packages = [
-    "specs-go",
-    "specs-go/v1"
-  ]
-  revision = "d60099175f88c47cd379c4738d158884749ed235"
-  version = "v1.0.1"
-
-[[projects]]
-  name = "github.com/opencontainers/runc"
-  packages = [
-    "libcontainer/system",
-    "libcontainer/user"
-  ]
-  revision = "baf6536d6259209c3edfa2b22237af82942d3dfa"
-  version = "v0.1.1"
-
-[[projects]]
-  name = "github.com/ory/dockertest"
-  packages = [
-    "docker",
-    "docker/opts",
-    "docker/pkg/archive",
-    "docker/pkg/fileutils",
-    "docker/pkg/homedir",
-    "docker/pkg/idtools",
-    "docker/pkg/ioutils",
-    "docker/pkg/jsonmessage",
-    "docker/pkg/longpath",
-    "docker/pkg/mount",
-    "docker/pkg/pools",
-    "docker/pkg/stdcopy",
-    "docker/pkg/system",
-    "docker/pkg/term",
-    "docker/pkg/term/windows",
-    "docker/types",
-    "docker/types/blkiodev",
-    "docker/types/container",
-    "docker/types/filters",
-    "docker/types/mount",
-    "docker/types/network",
-    "docker/types/registry",
-    "docker/types/strslice",
-    "docker/types/versions"
-  ]
-  revision = "2e92e7784b6fb199fd168aa46269a2f1b34f299e"
-  version = "v3.3.0"
-
-[[projects]]
-  name = "github.com/pkg/errors"
-  packages = ["."]
-  revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
-  version = "v0.8.0"
-
-[[projects]]
-  name = "github.com/pmezard/go-difflib"
-  packages = ["difflib"]
-  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/prometheus/client_golang"
-  packages = [
-    "prometheus",
-    "prometheus/promhttp"
-  ]
-  revision = "c5b7fccd204277076155f10851dad72b76a49317"
-  version = "v0.8.0"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/prometheus/client_model"
-  packages = ["go"]
-  revision = "99fa1f4be8e564e8a6b613da7fa6f46c9edafc6c"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/prometheus/common"
-  packages = [
-    "expfmt",
-    "internal/bitbucket.org/ww/goautoneg",
-    "model"
-  ]
-  revision = "d811d2e9bf898806ecfb6ef6296774b13ffc314c"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/prometheus/procfs"
-  packages = [
-    ".",
-    "internal/util",
-    "nfs",
-    "xfs"
-  ]
-  revision = "8b1c2da0d56deffdbb9e48d4414b4e674bd8083e"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/rubenv/sql-migrate"
-  packages = [
-    ".",
-    "sqlparse"
-  ]
-  revision = "081fe17d19ff4e2dd9f5a0c1158e6bcf74da6906"
-
-[[projects]]
-  name = "github.com/satori/go.uuid"
-  packages = ["."]
-  revision = "f58768cc1a7a7e77a3bd49e98cdd21419399b6a3"
-  version = "v1.2.0"
-
-[[projects]]
-  name = "github.com/sirupsen/logrus"
-  packages = ["."]
-  revision = "c155da19408a8799da419ed3eeb0cb5db0ad5dbc"
-  version = "v1.0.5"
-
-[[projects]]
-  name = "github.com/sony/gobreaker"
-  packages = ["."]
-  revision = "e9556a45379ef1da12e54847edb2fb3d7d566f36"
-  version = "0.3.0"
-
-[[projects]]
-  name = "github.com/spf13/cobra"
-  packages = ["."]
-  revision = "ef82de70bb3f60c65fb8eebacbb2d122ef517385"
-  version = "v0.0.3"
-
-[[projects]]
-  name = "github.com/spf13/pflag"
-  packages = ["."]
-  revision = "583c0c0531f06d5278b7d917446061adc344b5cd"
-  version = "v1.0.1"
-
-[[projects]]
-  name = "github.com/stretchr/testify"
-  packages = [
-    "assert",
-    "require"
-  ]
-  revision = "12b6f73e6084dad08a7c6e575284b177ecafbc71"
-  version = "v1.2.1"
-
-[[projects]]
-  name = "github.com/ugorji/go"
-  packages = ["codec"]
-  revision = "b4c50a2b199d93b13dc15e78929cfb23bfdf21ab"
-  version = "v1.1.1"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/crypto"
-  packages = [
-    "bcrypt",
-    "blowfish",
-    "pbkdf2",
-    "ssh/terminal"
-  ]
-  revision = "2d027ae1dddd4694d54f7a8b6cbe78dca8720226"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/net"
-  packages = [
-    "context",
-    "http/httpguts",
-    "http2",
-    "http2/hpack",
-    "idna",
-    "internal/timeseries",
-    "trace"
-  ]
-  revision = "f73e4c9ed3b7ebdd5f699a16a880c2b1994e50dd"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/sync"
-  packages = ["semaphore"]
-  revision = "1d60e4601c6fd243af51cc01ddf169918a5407ca"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/sys"
-  packages = [
-    "unix",
-    "windows"
-  ]
-  revision = "7dfd1290c7917b7ba22824b9d24954ab3002fe24"
-
-[[projects]]
-  name = "golang.org/x/text"
-  packages = [
-    "collate",
-    "collate/build",
-    "internal/colltab",
-    "internal/gen",
-    "internal/tag",
-    "internal/triegen",
-    "internal/ucd",
-    "language",
-    "secure/bidirule",
-    "transform",
-    "unicode/bidi",
-    "unicode/cldr",
-    "unicode/norm",
-    "unicode/rangetable"
-  ]
-  revision = "f21a4dfb5e38f5895301dc265a8def02365cc3d0"
-  version = "v0.3.0"
-
-[[projects]]
-  branch = "master"
-  name = "google.golang.org/genproto"
-  packages = ["googleapis/rpc/status"]
-  revision = "86e600f69ee4704c6efbf6a2a40a5c10700e76c2"
-
-[[projects]]
-  name = "google.golang.org/grpc"
-  packages = [
-    ".",
-    "balancer",
-    "balancer/base",
-    "balancer/roundrobin",
-    "channelz",
-    "codes",
-    "connectivity",
-    "credentials",
-    "encoding",
-    "encoding/proto",
-    "grpclb/grpc_lb_v1/messages",
-    "grpclog",
-    "internal",
-    "keepalive",
-    "metadata",
-    "naming",
-    "peer",
-    "resolver",
-    "resolver/dns",
-    "resolver/passthrough",
-    "stats",
-    "status",
-    "tap",
-    "transport"
-  ]
-  revision = "41344da2231b913fa3d983840a57a6b1b7b631a1"
-  version = "v1.12.0"
-
-[[projects]]
-  name = "gopkg.in/gorp.v1"
-  packages = ["."]
-  revision = "c87af80f3cc5036b55b83d77171e156791085e2e"
-  version = "v1.7.1"
-
-[[projects]]
-  name = "gopkg.in/inf.v0"
-  packages = ["."]
-  revision = "d2d2541c53f18d2a059457998ce2876cc8e67cbf"
-  version = "v0.9.1"
-
-[[projects]]
-  name = "gopkg.in/ory-am/dockertest.v3"
-  packages = ["."]
-  revision = "2e92e7784b6fb199fd168aa46269a2f1b34f299e"
-  version = "v3.3.0"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "e3b07d2098253644fc2f77fede1f00fcc077a20e4f46c59466ffd61c4998bb00"
-  solver-name = "gps-cdcl"
-  solver-version = 1
@@ -1,91 +0,0 @@
-[[constraint]]
-  name = "github.com/asaskevich/govalidator"
-  version = "9.0.0"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/cisco/senml"
-
-[[constraint]]
-  name = "github.com/dgrijalva/jwt-go"
-  version = "3.2.0"
-
-[[constraint]]
-  name = "github.com/fatih/color"
-  version = "1.7.0"
-
-[[constraint]]
-  name = "github.com/go-kit/kit"
-  version = "0.6.0"
-
-[[constraint]]
-  name = "github.com/go-zoo/bone"
-  version = "1.2.0"
-
-[[constraint]]
-  name = "github.com/golang/protobuf"
-  version = "1.1.0"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/hokaccha/go-prettyjson"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/lib/pq"
-
-[[constraint]]
-  name = "github.com/nats-io/go-nats"
-  version = "1.4.0"
-
-[[constraint]]
-  name = "github.com/prometheus/client_golang"
-  version = "0.8.0"
-
-[[constraint]]
-  name = "github.com/satori/go.uuid"
-  version = "1.2.0"
-
-[[constraint]]
-  name = "github.com/sony/gobreaker"
-  version = "0.3.0"
-
-[[constraint]]
-  name = "github.com/spf13/cobra"
-  version = "0.0.3"
-
-[[constraint]]
-  name = "github.com/stretchr/testify"
-  version = "1.2.1"
-
-[[constraint]]
-  branch = "master"
-  name = "golang.org/x/crypto"
-
-[[constraint]]
-  name = "gopkg.in/ory-am/dockertest.v3"
-  version = "3.1.6"
-
-[[constraint]]
-  name = "github.com/gorilla/websocket"
-  version = "1.2.0"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/rubenv/sql-migrate"
-
-[[constraint]]
-  name = "github.com/influxdata/influxdb"
-  version = "1.5.2"
-
-[[constraint]]
-  name = "github.com/mongodb/mongo-go-driver"
-  version = "0.0.5"
-
-[[constraint]]
-  branch = "master"
-  name = "github.com/gocql/gocql"
-
-[prune]
-  go-tests = true
-  unused-packages = true
@@ -176,7 +176,7 @@

   END OF TERMS AND CONDITIONS

-   Copyright 2015-2018 Mainflux
+   Copyright 2015-2020 Mainflux

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -7,7 +7,7 @@
 	
 	[[drasko]]
 	Name	= "Drasko DRASKOVIC"
-	Email	= "drasko.draskovic@mainflux.com"
+	Email	= "drasko@mainflux.com"
 	GitHub	= "drasko"

 # However, this role serves only in dead-lock events, or in a special and very rare cases
@@ -24,22 +24,23 @@

 [maintainers]

+	[[aleksandar]]
+	Name	= "Aleksandar NOVAKOVIC"
+	Email	= "aleksandar@mainflux.com"
+	GitHub	= "anovakovic01"
+ 
+ 	[[dusan]]
+	Name	= "Dusan BOROVCANIN"
+	Email	= "dusan@mainflux.com"
+	GitHub	= "dusanb94"
+
 	[[manuel]]
 	Name	= "Manuel IMPERIALE"
-	Email	= "manuel.imperiale@gmail.com"
+	Email	= "manuel@mainflux.com"
 	GitHub	= "manuIO"

-	[[janko]]
-	Name	= "Janko ISIDOROVIC"
-	Email	= "janko.isidorovic@mainflux.com"
-	GitHub	= "janko-isidorovic"
-
 	[[nikola]]
 	Name	= "Nikola MARCETIC"
-	Email	= "nikola.marcetic@mainflux.com"
+	Email	= "nikola@mainflux.com"
 	GitHub	= "nmarcetic"
-	
-	[[dejan]]
-	Name	= "Dejan MIJIC"
-	Email	= "dejan.mijic@mainflux.com"
-	GitHub	= "mijicd"
+
@@ -1,66 +1,114 @@
+# Copyright (c) Mainflux
+# SPDX-License-Identifier: Apache-2.0
+
+MF_DOCKER_IMAGE_NAME_PREFIX ?= mainflux
 BUILD_DIR = build
-SERVICES = users things http normalizer ws influxdb-writer influxdb-reader mongodb-writer mongodb-reader cassandra-writer cassandra-reader cli
+SERVICES = users things http coap lora influxdb-writer influxdb-reader mongodb-writer \
+	mongodb-reader cassandra-writer cassandra-reader postgres-writer postgres-reader timescale-writer timescale-reader cli \
+	bootstrap opcua auth twins mqtt provision certs smtp-notifier smpp-notifier
 DOCKERS = $(addprefix docker_,$(SERVICES))
+DOCKERS_DEV = $(addprefix docker_dev_,$(SERVICES))
 CGO_ENABLED ?= 0
-GOOS ?= linux
+GOARCH ?= amd64
+VERSION ?= $(shell git describe --abbrev=0 --tags)
+COMMIT ?= $(shell git rev-parse HEAD)
+TIME ?= $(shell date +%F_%T)

 define compile_service
-	CGO_ENABLED=$(CGO_ENABLED) GOOS=$(GOOS) GOARCH=$(GOARCH) GOARM=$(GOARM) go build -ldflags "-s -w" -o ${BUILD_DIR}/mainflux-$(1) cmd/$(1)/main.go
+	CGO_ENABLED=$(CGO_ENABLED) GOOS=$(GOOS) GOARCH=$(GOARCH) GOARM=$(GOARM) \
+	go build -mod=vendor -ldflags "-s -w \
+	-X 'github.com/mainflux/mainflux.BuildTime=$(TIME)' \
+	-X 'github.com/mainflux/mainflux.Version=$(VERSION)' \
+	-X 'github.com/mainflux/mainflux.Commit=$(COMMIT)'" \
+	-o ${BUILD_DIR}/mainflux-$(1) cmd/$(1)/main.go
 endef

 define make_docker
-	docker build --build-arg SVC_NAME=$(subst docker_,,$(1)) --tag=mainflux/$(subst docker_,,$(1)) -f docker/Dockerfile .
+	$(eval svc=$(subst docker_,,$(1)))
+
+	docker build \
+		--no-cache \
+		--build-arg SVC=$(svc) \
+		--build-arg GOARCH=$(GOARCH) \
+		--build-arg GOARM=$(GOARM) \
+		--build-arg VERSION=$(VERSION) \
+		--build-arg COMMIT=$(COMMIT) \
+		--build-arg TIME=$(TIME) \
+		--tag=$(MF_DOCKER_IMAGE_NAME_PREFIX)/$(svc) \
+		-f docker/Dockerfile .
 endef

-all: $(SERVICES) mqtt
+define make_docker_dev
+	$(eval svc=$(subst docker_dev_,,$(1)))

-.PHONY: all $(SERVICES) dockers latest release mqtt
+	docker build \
+		--no-cache \
+		--build-arg SVC=$(svc) \
+		--tag=$(MF_DOCKER_IMAGE_NAME_PREFIX)/$(svc) \
+		-f docker/Dockerfile.dev ./build
+endef
+
+all: $(SERVICES)
+
+.PHONY: all $(SERVICES) dockers dockers_dev latest release

 clean:
 	rm -rf ${BUILD_DIR}
-	rm -rf mqtt/node_modules
+
+cleandocker:
+	# Stops containers and removes containers, networks, volumes, and images created by up
+	docker-compose -f docker/docker-compose.yml down --rmi all -v --remove-orphans
+
+ifdef pv
+	# Remove unused volumes
+	docker volume ls -f name=$(MF_DOCKER_IMAGE_NAME_PREFIX) -f dangling=true -q | xargs -r docker volume rm
+endif

 install:
 	cp ${BUILD_DIR}/* $(GOBIN)

 test:
-	GOCACHE=off go test -v -race -tags test $(shell go list ./... | grep -v 'vendor\|cmd')
+	go test -mod=vendor -v -race -count 1 -tags test $(shell go list ./... | grep -v 'vendor\|cmd')

 proto:
-	protoc --go_out=plugins=grpc:. *.proto
+	protoc --gofast_out=plugins=grpc:. *.proto
+	protoc --gofast_out=plugins=grpc:. pkg/messaging/*.proto

 $(SERVICES):
 	$(call compile_service,$(@))

 $(DOCKERS):
-	$(call make_docker,$(@))
+	$(call make_docker,$(@),$(GOARCH))
+
+$(DOCKERS_DEV):
+	$(call make_docker_dev,$(@))

 dockers: $(DOCKERS)
-	docker build --tag=mainflux/dashflux -f dashflux/docker/Dockerfile dashflux
-	docker build --tag=mainflux/mqtt -f mqtt/Dockerfile .
+dockers_dev: $(DOCKERS_DEV)

-mqtt:
-	cd mqtt && npm install
+define docker_push
+	for svc in $(SERVICES); do \
+		docker push $(MF_DOCKER_IMAGE_NAME_PREFIX)/$$svc:$(1); \
+	done
+endef
+
+changelog:
+	git log $(shell git describe --tags --abbrev=0)..HEAD --pretty=format:"- %s"

 latest: dockers
-	for svc in $(SERVICES); do \
-		docker push mainflux/$$svc; \
-	done
-	docker push mainflux/dashflux
-	docker push mainflux/mqtt
+	$(call docker_push,latest)

 release:
 	$(eval version = $(shell git describe --abbrev=0 --tags))
 	git checkout $(version)
 	$(MAKE) dockers
 	for svc in $(SERVICES); do \
-		docker tag mainflux/$$svc mainflux/$$svc:$(version); \
-		docker push mainflux/$$svc:$(version); \
+		docker tag $(MF_DOCKER_IMAGE_NAME_PREFIX)/$$svc $(MF_DOCKER_IMAGE_NAME_PREFIX)/$$svc:$(version); \
 	done
-	docker tag mainflux/dashflux mainflux/dashflux:$(version)
-	docker push mainflux/dashflux:$(version)
-	docker tag mainflux/mqtt mainflux/mqtt:$(version)
-	docker push mainflux/mqtt:$(version)
+	$(call docker_push,$(version))
+
+rundev:
+	cd scripts && ./run.sh

 run:
-	cd scripts && ./run.sh
+	docker-compose -f docker/docker-compose.yml up
@@ -8,9 +8,9 @@

 ![banner][banner]

-Mainflux is modern, scalable, secure open source and patent-free IoT cloud platform written in Go.
+Mainflux is modern, scalable, secure, open-source, and patent-free IoT cloud platform written in Go.

-It accepts user, device, and application connections over various network protocols (i.e. HTTP,
+It accepts user and thing (sensor, actuator, application) connections over various network protocols (i.e. HTTP,
 MQTT, WebSocket, CoAP), thus making a seamless bridge between them. It is used as the IoT middleware
 for building complex IoT solutions.

@@ -18,43 +18,137 @@ For more details, check out the [official documentation][docs].

 ## Features

- Protocol bridging (i.e. HTTP, MQTT, WebSocket, CoAP)
- Device management and provisioning
- Fine-grained access control
- Platform logging and instrumentation support
- Container-based deployment using [Docker][docker]
+- Multi-protocol connectivity and bridging (HTTP, MQTT, WebSocket and CoAP)
+- Device management and provisioning (Zero Touch provisioning)
+- Mutual TLS Authentication (mTLS) using X.509 Certificates
+- Fine-grained access control (policies, ABAC/RBAC)
+- Message persistence (Cassandra, InfluxDB, MongoDB and PostgresSQL)
+- Platform logging and instrumentation support (Grafana, Prometheus and OpenTracing)
+- Event sourcing
+- Container-based deployment using [Docker][docker] and [Kubernetes][kubernetes]
+- [LoRaWAN][lora] network integration
+- [OPC UA](opcua) integration
+- Edge [Agent](agent) and [Export](export) services for remote IoT gateway management and edge computing
+- SDK
+- CLI
+- Small memory footprint and fast execution
+- Domain-driven design architecture, high-quality code and test coverage

-## Quickstart
+## Prerequisites

-Before proceeding, install the following prerequisites:
+The following are needed to run Mainflux:

- [Docker](https://docs.docker.com/install/)
- [Docker compose](https://docs.docker.com/compose/install/)
+- [Docker](https://docs.docker.com/install/) (version 20.10)
+- [Docker compose](https://docs.docker.com/compose/install/) (version 1.29)

-Once everything is installed, execute the following commands from project root:
+Developing Mainflux will also require:
+
+- [Go](https://golang.org/doc/install) (version 1.13.3)
+- [Protobuf](https://github.com/protocolbuffers/protobuf#protocol-compiler-installation) (version 3.6.1)
+
+## Install
+
+Once the prerequisites are installed, execute the following commands from the project's root:

 ```bash
-docker-compose -f docker/docker-compose.yml up -d
+docker-compose -f docker/docker-compose.yml up
 ```

+This will bring up the Mainflux docker services and interconnect them. This command can also be executed using the project's included Makefile:
+
+```bash
+make run
+```
+
+If you want to run services from specific release checkout code from github and make sure that
+`MF_RELEASE_TAG` in [.env](.env) is being set to match the release version
+
+```bash
+git checkout tags/<release_number> -b <release_number>
+# e.g. `git checkout tags/0.13.0 -b 0.13.0`
+```
+
+Check that `.env` file contains:
+
+```bash
+MF_RELEASE_TAG=<release_number>
+```
+
+>`docker-compose` should be used for development and testing deployments. For production we suggest using [Kubernetes](https://docs.mainflux.io/kubernetes).
+
+## Usage
+
+The quickest way to start using Mainflux is via the CLI. The latest version can be downloaded from the [official releases page][rel].
+
+It can also be built and used from the project's root directory:
+
+```bash
+make cli
+./build/mainflux-cli version
+```
+
+Additional details on using the CLI can be found in the [CLI documentation](https://docs.mainflux.io/cli).
+
+## Documentation
+
+Official documentation is hosted at [Mainflux official docs page][docs]. Documentation is auto-generated, checkout the instructions on [official docs repository](https://github.com/mainflux/docs):
+
+If you spot an error or a need for corrections, please let us know - or even better: send us a PR.
+
+## Authors
+
+Main architect and BDFL of Mainflux project is [@drasko][drasko].
+
+Additionally, [@nmarcetic][nikola] and [@janko-isidorovic][janko] assured
+overall architecture and design, while [@manuio][manu] and [@darkodraskovic][darko]
+helped with crafting initial implementation and continuously worked on the project evolutions.
+
+Besides them, Mainflux is constantly improved and actively
+developed by [@anovakovic01][alex], [@dusanb94][dusan], [@srados][sava],
+[@gsaleh][george], [@blokovi][iva], [@chombium][kole], [@mteodor][mirko] and a large set of contributors.
+
+Maintainers are listed in [MAINTAINERS](MAINTAINERS) file.
+
+The Mainflux team would like to give special thanks to [@mijicd][dejan] for his monumental work
+on designing and implementing a highly improved and optimized version of the platform,
+and [@malidukica][dusanm] for his effort on implementing the initial user interface.
+
+## Professional Support
+
+There are many companies offering professional support for the Mainflux system.
+
+If you need this kind of support, best is to reach out to [@drasko][drasko] directly, and he will point you out to the best-matching support team.
+
 ## Contributing

-Thank you for your interest in Mainflux and wish to contribute!
+Thank you for your interest in Mainflux and the desire to contribute!

-1. Take a look at our [open issues](https://github.com/mainflux/mainflux/issues).
-2. Checkout the [contribution guide](.github/CONTRIBUTING.md) to learn more about our style and conventions.
+1. Take a look at our [open issues](https://github.com/mainflux/mainflux/issues). The [good-first-issue](https://github.com/mainflux/mainflux/labels/good-first-issue) label is specifically for issues that are great for getting started.
+2. Checkout the [contribution guide](CONTRIBUTING.md) to learn more about our style and conventions.
 3. Make your changes compatible to our workflow.

+### We're Hiring
+
+You like Mainflux and you would like to make it your day job? We're always looking for talented engineers interested in open-source, IoT and distributed systems. If you recognize yourself, reach out to [@drasko][drasko] - he will contact you back.
+
+>The best way to grab our attention is, of course, by sending PRs :sunglasses:.
+
 ## Community

 - [Google group][forum]
 - [Gitter][gitter]
 - [Twitter][twitter]

-[banner]: https://github.com/mainflux/mainflux/blob/master/docs/img/gopherBanner.jpg
+## License
+
+[Apache-2.0](LICENSE)
+
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fmainflux%2Fmainflux.svg?type=large)](https://app.fossa.com/projects/git%2Bgithub.com%2Fmainflux%2Fmainflux?ref=badge_large)
+
+[banner]: https://github.com/mainflux/docs/blob/master/docs/img/gopherBanner.jpg
 [ci-badge]: https://semaphoreci.com/api/v1/mainflux/mainflux/branches/master/badge.svg
 [ci-url]: https://semaphoreci.com/mainflux/mainflux
-[docs]: http://mainflux.readthedocs.io
+[docs]: https://docs.mainflux.io
 [docker]: https://www.docker.com
 [forum]: https://groups.google.com/forum/#!forum/mainflux
 [gitter]: https://gitter.im/mainflux/mainflux?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
@@ -65,3 +159,28 @@ Thank you for your interest in Mainflux and wish to contribute!
 [cov-url]: https://codecov.io/gh/mainflux/mainflux
 [license]: https://img.shields.io/badge/license-Apache%20v2.0-blue.svg
 [twitter]: https://twitter.com/mainflux
+[lora]: https://lora-alliance.org/
+[opcua]: https://opcfoundation.org/about/opc-technologies/opc-ua/
+[agent]: https://github.com/mainflux/agent
+[export]: https://github.com/mainflux/export
+[kubernetes]: https://kubernetes.io/
+[rel]: https://github.com/mainflux/mainflux/releases
+[careers]: https://www.mainflux.com/careers.html
+[lf]: https://www.linuxfoundation.org/
+[edgex]: https://www.edgexfoundry.org/
+[company]: https://www.mainflux.com/
+[blog]: https://medium.com/mainflux-iot-platform
+[drasko]: https://github.com/drasko
+[nikola]: https://github.com/nmarcetic
+[dejan]: https://github.com/mijicd
+[manu]: https://github.com/manuIO
+[darko]: https://github.com/darkodraskovic
+[janko]: https://github.com/janko-isidorovic
+[alex]: https://github.com/anovakovic01
+[dusan]: https://github.com/dusanb94
+[sava]: https://github.com/srados
+[george]: https://github.com/gesaleh
+[iva]: https://github.com/blokovi
+[kole]: https://github.com/chombium
+[dusanm]: https://github.com/malidukica
+[mirko]: https://github.com/mteodor
@@ -1,9 +1,5 @@
-//
-// Copyright (c) 2018
-// Mainflux
-//
+// Copyright (c) Mainflux
 // SPDX-License-Identifier: Apache-2.0
-//

 package mainflux

@@ -0,0 +1,92 @@
+asyncapi: '2.2.0'
+info:
+  title: MQTT Adapter
+  license:
+    name: Apache 2.0
+    url: https://www.apache.org/licenses/LICENSE-2.0
+  version: '1.0.0'
+  description: |
+    MQTT adapter provides an MQTT API for sending messages through the platform. MQTT adapter uses [mProxy](https://github.com/mainflux/mproxy) for proxying traffic between client and MQTT broker.
+    Additionally, the MQTT adapter and the NATS message broker are replicating the traffic between brokers.
+
+defaultContentType: application/json
+
+servers:
+  dev:
+    url: localhost:{port}
+    protocol: mqtt
+    description: Test broker
+    variables:
+      port:
+        description: Secure connection (TLS) is available through port 8883.
+        default: '1883'
+        enum:
+          - '1883'
+          - '8883'
+      username:
+        description: Thing ID connected to the channel defined in the MQTT topic.
+      password:
+        description: Thing Key corresponding to the Thing ID.
+
+channels:
+  channels/{channelId}/messages/{subtopic}:
+    parameters:
+      channelId:
+        $ref: '#/components/parameters/channelId'
+      subtopic:
+        $ref: '#/components/parameters/subtopic'
+    publish:
+      traits:
+        - $ref: '#/components/operationTraits/mqtt'
+      message:
+        $ref: '#/components/messages/jsonMsg'
+    subscribe:
+      traits:
+        - $ref: '#/components/operationTraits/mqtt'
+      message:
+        $ref: '#/components/messages/jsonMsg'
+
+components:
+  messages:
+    jsonMsg:
+      title: JSON Message
+      summary: Arbitrary JSON array or object.
+      contentType: application/json
+      payload:
+        $ref: "#/components/schemas/jsonMsg"
+
+  schemas:
+    jsonMsg:
+      type: object
+      description: Arbitrary JSON object or array. SenML format is recommended.
+      example: |
+        ### SenML
+        ```json
+        [{"bn":"some-base-name:","bt":1641646520, "bu":"A","bver":5, "n":"voltage","u":"V","v":120.1}, {"n":"current","t":-5,"v":1.2}, {"n":"current","t":-4,"v":1.3}]
+        ```
+        ### JSON
+        ```json
+        {"field_1":"val_1", "t": 1641646525}
+        ```
+        ### JSON Array
+        ```json
+        [{"field_1":"val_1", "t": 1641646520},{"field_2":"val_2", "t": 1641646522}]
+        ```
+
+  parameters:
+    channelId:
+      description: Channel ID connected to the Thing ID defined in the username.
+      schema:
+        type: string
+        format: uuid
+    subtopic:
+      description: Arbitrary message subtopic.
+      schema:
+        type: string
+        default: ''
+
+  operationTraits:
+    mqtt:
+      bindings:
+        mqtt:
+          qos: 2
@@ -0,0 +1,5 @@
+# Mainflux OpenAPI Specification
+
+This folder contains an OpenAPI specifications for Mainflux API.
+
+View specification in Swagger UI at [api.mainflux.io](https://api.mainflux.io)
@@ -0,0 +1,735 @@
+openapi: 3.0.1
+info:
+  title: Mainflux authentication service
+  description: HTTP API for managing platform API keys.
+  version: "1.0.0"
+paths:
+  /keys:
+    post:
+      summary: Issue API key
+      description: |
+        Generates a new API key. Thew new API key will
+        be uniquely identified by its ID.
+      tags:
+        - auth
+      requestBody:
+        $ref: "#/components/requestBodies/KeyRequest"
+      responses:
+        '201':
+          description: Issued new key.
+        '400':
+          description: Failed due to malformed JSON.
+        '409':
+          description: Failed due to using already existing ID.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /keys/{id}:
+    get:
+      summary: Gets API key details.
+      description: |
+        Gets API key details for the given key.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/ApiKeyId"
+      responses:
+        '200':
+          $ref: "#/components/responses/KeyRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    delete:
+      summary: Revoke API key
+      description: |
+        Revoke API key identified by the given ID.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/ApiKeyId"
+      responses:
+        '204':
+          description: Key revoked.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups:
+    post:
+      summary: Creates new group
+      description: |
+        Creates new group that can be used for grouping entities - things, users.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/requestBodies/GroupCreateReq"
+      responses:
+        '201':
+          $ref: "#/components/responses/GroupCreateRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '409':
+          description: Failed due to using an existing email address.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: Gets all groups.
+      description: |
+        Gets all groups up to a max level of hierarchy that can be fetched in one
+        request ( max level = 5). Result can be filtered by metadata. Groups will
+        be returned as JSON array or JSON tree.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/Level"
+        - $ref: "#/components/parameters/Metadata"
+        - $ref: "#/components/parameters/Tree"
+      responses:
+        '200':
+          $ref: "#/components/responses/GroupsPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{groupId}:
+    get:
+      summary: Gets group info.
+      description: |
+        Gets info on a group specified by id.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+      responses:
+        '200':
+          $ref: "#/components/responses/GroupRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    put:
+      summary: Updates group data.
+      description: |
+        Updates Name, Description or Metadata of a group.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+      requestBody:
+        $ref: "#/components/requestBodies/GroupUpdateReq"
+      responses:
+        '200':
+          description: Group updated.
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    delete:
+      summary: Deletes group.
+      description: |
+        Deletes group. If group is parent and descendant groups do not have any members
+        child groups will be deleted. Group cannot be deleted if has members or if
+        any descendant group has members.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+        - $ref: "#/components/parameters/Level"
+        - $ref: "#/components/parameters/Metadata"
+        - $ref: "#/components/parameters/Tree"
+      responses:
+        '204':
+          description: Group removed.
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{groupId}/children:
+    get:
+      summary: Gets group children.
+      description: |
+        Gets the whole tree of descendants of group for given id including itself.
+        For performance reason request is limited up to a given level of hierarchy
+        (max. 5).
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+        - $ref: "#/components/parameters/Level"
+        - $ref: "#/components/parameters/Metadata"
+        - $ref: "#/components/parameters/Tree"
+      responses:
+        '200':
+          $ref: "#/components/responses/GroupsPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{groupId}/parents:
+    get:
+      summary: Gets group info.
+      description: |
+        Gets a direct line of ancestors for a group specified by id.
+        Result is up to a specified hierarchy level or up to a root group.
+        Result can be a JSON array or a JSON tree.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+        - $ref: "#/components/parameters/Level"
+        - $ref: "#/components/parameters/Metadata"
+        - $ref: "#/components/parameters/Tree"
+      responses:
+        '200':
+          $ref: "#/components/responses/GroupsPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Group does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{groupId}/members:
+    post:
+      summary: Assigns members to a group.
+      description: |
+        Assigns thing or user id to a group.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+      requestBody:
+        $ref: "#/components/requestBodies/MembersReq"
+      responses:
+        '201':
+          $ref: "#/components/responses/GroupCreateRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '409':
+          description: Failed due to using an existing email address.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: Gets members of a group.
+      description: |
+        Array of member ids that are in the group specified with groupID.
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Limit"
+      responses:
+        '200':
+          $ref: "#/components/responses/MembersRes"
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{userGroupID}/share:
+    post:
+      summary: Adds access rights on thing groups to user group with userGroupID.
+      description: |
+        Takes user group id through parameter and adds access rights for user group on thing group received via request body.
+      tags:
+        - auth
+      parameters:
+        - $ref: "#/components/parameters/UserGroupID"
+      requestBody:
+        $ref: "#/components/requestBodies/ShareGroupAccessReq"
+      responses:
+        '200':
+          description: User group shared with thing group.
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /members/{memberId}/groups:
+    get:
+      summary: Gets memberships for a member with member id.
+      description: |
+        Array of groups that member belongs to.
+      parameters:
+        - $ref: "#/components/parameters/MemberId"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Limit"
+        - $ref: "#/components/parameters/Metadata"
+      responses:
+        '200':
+          $ref: "#/components/responses/GroupRes"
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /policies:
+    post:
+      summary: Creates new policies.
+      description: |
+        Creates new policies. Only admin can use this endpoint. Therefore, you need an authentication token for the admin.
+        Also, only policies defined on the system are allowed to add. For more details, please see the docs for Authorization.
+      tags:
+        - auth
+      requestBody:
+        $ref: "#/components/requestBodies/PoliciesReq"
+      responses:
+        '201':
+          description: Policies created.
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '403':
+          description: Unauthorized access token provided.
+        '409':
+          description: Failed due to using an existing email address.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    put:
+      summary: Deletes policies.
+      description: |
+        Deletes policies. Only admin can use this endpoint. Therefore, you need an authentication token for the admin.
+        Also, only policies defined on the system are allowed to delete. For more details, please see the docs for Authorization.
+      tags:
+        - auth
+      requestBody:
+        $ref: "#/components/requestBodies/PoliciesReq"
+      responses:
+        '204':
+          description: Policies deleted.
+        '400':
+          description: Failed due to malformed JSON.
+        '409':
+          description: Failed due to using an existing email address.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    Key:
+      type: object
+      properties:
+        id:
+          type: string
+          format: uuid
+          example: "c5747f2f-2a7c-4fe1-b41a-51a5ae290945"
+          description: API key unique identifier
+        issuer_id:
+          type: string
+          format: uuid
+          example: "9118de62-c680-46b7-ad0a-21748a52833a"
+          description: In ID of the entity that issued the token.
+        type:
+          type: integer
+          example: 0
+          description: API key type. Keys of different type are processed differently.
+        subject:
+          type: string
+          format: string
+          example: "test@example.com"
+          description: User's email or service identifier of API key subject.
+        issued_at:
+          type: string
+          format: date-time
+          example: "2019-11-26 13:31:52"
+          description: Time when the key is generated.
+        expires_at:
+          type: string
+          format: date-time
+          example: "2019-11-26 13:31:52"
+          description: Time when the Key expires. If this field is missing,
+            that means that Key is valid indefinitely.
+    GroupReqSchema:
+      type: object
+      properties:
+        name:
+          type: string
+          description: |
+            Free-form group name. Group name is unique on the given hierarchy level.
+        description:
+          type: string
+          description: Group description, free form text.
+        parent_id:
+          type: string
+          format: ulid
+          description: Id of parent group, it must be existing group.
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded group's data.
+    GroupUpdateSchema:
+      type: object
+      properties:
+        name:
+          type: string
+          description: |
+            Free-form group name. Group name is unique on the given hierarchy level.
+        description:
+          type: string
+          description: Group description, free form text.
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded group's data.
+    GroupResSchema:
+      type: object
+      properties:
+        id:
+          type: string
+          format: ulid
+          description: Unique group identifier generated by the service.
+        name:
+          type: string
+          description: Free-form group name.
+        parent_id:
+          type: string
+          description: Group ID of parent group.
+        owner_id:
+          type: string
+          format: uuid
+          description: UUID of user that created the group.
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded group's data.
+        level:
+          type: integer
+          description: Level in hierarchy, distance from the root group.
+        path:
+          type: string
+          description: Hierarchy path, concatenated ids of group ancestors.
+        children:
+          type: object
+          # schema: GroupResSchema
+        created_at:
+          type: string
+          description: Datetime of group creation.
+        updated_at:
+          type: string
+          description: Datetime of last group updated.
+      required:
+        - id
+        - name
+        - owner_id
+        - description
+        - level
+        - path
+        - created_at
+        - updated_at
+    MembersReqSchema:
+      type: object
+      properties:
+        members:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            type: string
+            format: uuid | ulid
+        type:
+          type: string
+          description: Type of entity
+    ShareGroupAccessReqSchema:
+      type: object
+      properties:
+        thing_group_id:
+          type: string
+          description: Group ID of the Thing Group.
+          format: uuid
+    GroupsPage:
+      type: object
+      properties:
+        groups:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/GroupResSchema"
+        total:
+          type: integer
+          description: Total number of items.
+        level:
+          type: integer
+          description: Level of hierarchy up to which groups are fetched.
+      required:
+        - groups
+        - total
+        - level
+    MembershipPage:
+      type: object
+      properties:
+        groups:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/GroupResSchema"
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+        total:
+          type: integer
+          description: Total number of items.
+      required:
+        - groups
+    PoliciesReqSchema:
+      type: object
+      properties:
+        object:
+          type: string
+          description: |
+            Specifies an object field for the field.
+            Object indicates application objects such as ThingID.
+        subjects:
+          type: array
+          minItems: 1
+          uniqueItems: true
+          items:
+            type: string
+        policies:
+          type: array
+          minItems: 1
+          uniqueItems: true
+          items:
+            type: string
+
+  parameters:
+    ApiKeyId:
+      name: id
+      description: API Key ID.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    UserGroupID:
+      name: userGroupID
+      description: User Group ID.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    GroupId:
+      name: groupId
+      description: Group ID.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    MemberId:
+      name: memberId
+      description: Member id.
+      in: path
+      schema:
+        type: string
+        format: uuid | ulid
+      required: true
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+    Level:
+      name: level
+      description: Level of hierarchy up to which to retrieve groups from given group id.
+      in: query
+      schema:
+        type: integer
+        minimum: 1
+        maximum: 5
+      required: false
+    Metadata:
+      name: metadata
+      description: Metadata filter. Filtering is performed matching the parameter with metadata on top level. Parameter is json.
+      in: query
+      required: false
+      schema:
+        type: object
+        additionalProperties: {}
+    Tree:
+      name: tree
+      description: Specify type of response, JSON array or tree.
+      in: query
+      required: false
+      schema:
+        type: boolean
+        default: false
+
+  requestBodies:
+    KeyRequest:
+      description: JSON-formatted document describing key request.
+      required: true
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              type:
+                type: integer
+                example: 0
+                description: API key type. Keys of different type are processed differently.
+              duration:
+                type: number
+                format: integer
+                example: 23456
+                description: Number of seconds issued token is valid for.
+    GroupCreateReq:
+      description: JSON-formatted document describing group create request.
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/GroupReqSchema"
+    GroupUpdateReq:
+      description: JSON-formatted document describing group create request.
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/GroupUpdateSchema"
+    MembersReq:
+      description: JSON array of member IDs.
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/MembersReqSchema"
+    ShareGroupAccessReq:
+      description: test
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/ShareGroupAccessReqSchema"
+    PoliciesReq:
+      description: JSON-formatted document describing adding policies request.
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/PoliciesReqSchema"
+
+  responses:
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    KeyRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Key"
+    GroupCreateRes:
+      description: Group created.
+      headers:
+        Location:
+          content:
+            text/plain:
+              schema:
+                type: string
+                description: Created group's relative URL.
+                example: /groups/{groupId}
+    ShareAccessRightRes:
+      description: User group shared with thing group.
+    GroupRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/GroupResSchema"
+    GroupsPageRes:
+      description: Group data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/GroupsPage"
+    MembersRes:
+      description: Groups data retrieved. Groups assigned to a member.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/MembershipPage"
+    MembershipPageRes:
+      description: Groups data retrieved. Groups assigned to a member.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/MembershipPage"
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,531 @@
+openapi: 3.0.1
+info:
+  title: Mainflux Bootstrap service
+  description: HTTP API for managing platform things configuration.
+  version: "1.0.0"
+
+paths:
+  /things/configs:
+    post:
+      summary: Adds new config
+      description: |
+        Adds new config to the list of config owned by user identified using
+        the provided access token.
+      tags:
+        - configs
+      requestBody:
+        $ref: "#/components/requestBodies/ConfigCreateReq"
+      responses:
+        '201':
+          $ref: "#/components/responses/ConfigCreateRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: Retrieves managed configs
+      description: |
+        Retrieves a list of managed configs. Due to performance concerns, data
+        is retrieved in subsets. The API configs must ensure that the entire
+        dataset is consumed either by making subsequent requests, or by
+        increasing the subset size of the initial request.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/Limit"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/State"
+        - $ref: "#/components/parameters/Name"
+      responses:
+        '200':
+          $ref: "#/components/responses/ConfigListRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/configs/{configId}:
+    get:
+      summary: Retrieves config info (with channels).
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      responses:
+        '200':
+          $ref: "#/components/responses/ConfigRes"
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Config does not exist.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    put:
+      summary: Updates config info
+      description: |
+        Update is performed by replacing the current resource data with values
+        provided in a request payload. Note that the owner, ID, external ID,
+        external key, Mainflux Thing ID and key cannot be changed.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      requestBody:
+          $ref: "#/components/requestBodies/ConfigUpdateReq"
+      responses:
+        '200':
+          description: Config updated.
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Config does not exist.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    delete:
+      summary: Removes a Config
+      description: |
+        Removes a Config. In case of successful removal the service will ensure
+        that the removed config is disconnected from all of the Mainflux channels.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      responses:
+        '204':
+          description: Config removed.
+        '400':
+          description: Failed due to malformed config ID.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/configs/certs/{configId}:
+    patch:
+      summary: Updates certs
+      description: |
+        Update is performed by replacing the current certificate data with values
+        provided in a request payload.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      requestBody:
+        $ref: "#/components/requestBodies/ConfigCertUpdateReq"
+      responses:
+        '200':
+          description: Config updated.
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Config does not exist.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/configs/connections/{configId}:
+    put:
+      summary: Updates channels the thing is connected to
+      description: |
+        Update connections performs update of the channel list corresponding
+        Thing is connected to.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      requestBody:
+        $ref: "#/components/requestBodies/ConfigConnUpdateReq"
+      responses:
+        '200':
+          description: Config updated.
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Config does not exist.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/bootstrap/{externalId}:
+    get:
+      summary: Retrieves configuration.
+      description: |
+        Retrieves a configuration with given external ID and external key.
+      tags:
+        - configs
+      security:
+        - bootstrapAuth: []
+      parameters:
+        - $ref: "#/components/parameters/ExternalId"
+      responses:
+        '200':
+          $ref: "#/components/responses/BootstrapConfigRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid external key provided.
+        '404':
+          description: Failed to retrieve corresponding config.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/bootstrap/secure/{externalId}:
+    get:
+      summary: Retrieves configuration.
+      description: |
+        Retrieves a configuration with given external ID and encrypted external key.
+      tags:
+        - configs
+      security:
+        - bootstrapEncAuth: []
+      parameters:
+        - $ref: "#/components/parameters/ExternalId"
+      responses:
+        '200':
+          $ref: "#/components/responses/BootstrapConfigRes"
+        '404':
+          description: |
+            Failed to retrieve corresponding config.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /things/state/{configId}:
+    put:
+      summary: Updates Config state.
+      description: |
+        Updating state represents enabling/disabling Config, i.e. connecting
+        and disconnecting corresponding Mainflux Thing to the list of Channels.
+      tags:
+        - configs
+      parameters:
+        - $ref: "#/components/parameters/ConfigId"
+      requestBody:
+        $ref: '#/components/requestBodies/ConfigStateUpdateReq'
+      responses:
+        '204':
+          description: Config removed.
+        '400':
+          description: Failed due to malformed config's ID.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    State:
+      type: integer
+      enum: [0, 1]
+    Config:
+      type: object
+      properties:
+        mainflux_id:
+          type: string
+          format: uuid
+          description: Corresponding Mainflux Thing ID.
+        mainflux_key:
+          type: string
+          format: uuid
+          description: Corresponding Mainflux Thing key.
+        mainflux_channels:
+          type: array
+          minItems: 0
+          items:
+            type: object
+            properties:
+              id:
+                type: string
+                format: uuid
+                description: Channel unique identifier.
+              name:
+                type: string
+                description: Name of the Channel.
+              metadata:
+                type: object
+                description: Custom metadata related to the Channel.
+        external_id:
+          type: string
+          description: External ID (MAC address or some unique identifier).
+        external_key:
+          type: string
+          description: External key.
+        content:
+          type: string
+          description: Free-form custom configuration.
+        state:
+          $ref: "#/components/schemas/State"
+      required:
+        - external_id
+        - external_key
+    ConfigList:
+      type: object
+      properties:
+        total:
+          type: integer
+          description: Total number of results.
+          minimum: 0
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+          minimum: 0
+          default: 0
+        limit:
+          type: integer
+          description: Size of the subset to retrieve.
+          maximum: 100
+          default: 10
+        configs:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/Config"
+      required:
+        - configs
+    BootstrapConfig:
+      type: object
+      properties:
+        mainflux_id:
+          type: string
+          format: uuid
+          description: Corresponding Mainflux Thing ID.
+        mainflux_key:
+          type: string
+          format: uuid
+          description: Corresponding Mainflux Thing key.
+        mainflux_channels:
+          type: array
+          minItems: 0
+          items:
+            type: string
+        content:
+          type: string
+          description: Free-form custom configuration.
+        client_cert:
+          type: string
+          description: Client certificate.
+        client_key:
+          type: string
+          description: Key for the client_cert.
+        ca_cert:
+          type: string
+          description: Issuing CA certificate.
+      required:
+        - mainflux_id
+        - mainflux_key
+        - mainflux_channels
+        - content
+
+  parameters:
+    ConfigId:
+      name: configId
+      description: Unique Config identifier. It's the ID of the corresponding Thing.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    ExternalId:
+      name: externalId
+      description: Unique Config identifier provided by external entity.
+      in: path
+      schema:
+        type: string
+      required: true
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+    State:
+      name: state
+      description: A state of items
+      in: query
+      schema:
+        $ref: "#/components/schemas/State"
+      required: false
+    Name:
+      name: name
+      description: Name of the config. Search by name is partial-match and case-insensitive.
+      in: query
+      schema:
+        type: string
+      required: false
+
+  requestBodies:
+    ConfigCreateReq:
+      description: JSON-formatted document describing the new config.
+      required: true
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              external_id:
+                type: string
+                description: External ID (MAC address or some unique identifier).
+              external_key:
+                type: string
+                description: External key.
+              thing_id:
+                type: string
+                description: ID of the corresponding Mainflux Thing.
+              channels:
+                type: array
+                minItems: 0
+                items:
+                  type: string
+              content:
+                type: string
+            required:
+              - external_id
+              - external_key
+    ConfigUpdateReq:
+      description: JSON-formatted document describing the updated thing.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              content:
+                type: string
+              name:
+                type: string
+            required:
+              - content
+              - name
+    ConfigCertUpdateReq:
+      description: JSON-formatted document describing the updated thing.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              client_cert:
+                type: string
+              client_key:
+                type: string
+              ca_cert:
+                type: string
+    ConfigConnUpdateReq:
+      description: Array if IDs the thing is be connected to.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              channels:
+                type: array
+                minItems: 0
+                items:
+                  type: string
+    ConfigStateUpdateReq:
+      description: Update the state of the Config.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              state:
+                $ref: "#/components/schemas/State"
+
+  responses:
+    ConfigCreateRes:
+     description: Config registered.
+     headers:
+       Location:
+         content:
+           text/plain:
+             schema:
+               type: string
+               description: Created configuration's relative URL (i.e. /things/configs/{configId}).
+    ConfigListRes:
+      description: Data retrieved. Configs from this list don't contain channels.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/ConfigList"
+    ConfigRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Config"
+    BootstrapConfigRes:
+      description: |
+          Data retrieved. If secure, a response is encrypted using
+          the secret key, so the response is in the binary form.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/BootstrapConfig"
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+    bootstrapAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: string
+      description: |
+        * Things access: "Authorization: Thing <external_key>"
+
+    bootstrapEncAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: aes-sha256-uuid
+      description: |
+        * Things access: "Authorization: Thing <external_enc_key>"
+        Hex-encoded configuration external key encrypted using
+        the AES algorithm and SHA256 sum of the external key
+        itself as an encryption key.
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,257 @@
+openapi: 3.0.1
+info:
+  title: Mainflux Certs service
+  description: HTTP API for Certs service
+  version: "1.0.0"
+
+paths:
+  /certs:
+    post:
+      summary: Creates a certificate for thing
+      description: Creates a certificate for thing
+      tags:
+        - certs
+      requestBody:
+        $ref: "#/components/requestBodies/CertReq"
+      responses:
+        '201':
+          description: Created
+        '400':
+          description: Failed due to malformed JSON.
+        "401":
+          description: Missing or invalid access token provided.
+        '500':
+          description: Unexpected server-side error ocurred.
+  /certs/{certID}:
+    get:
+      summary: Retrieves a certificate
+      description: |
+        Retrieves a certificate for a given cert ID.
+      tags:
+        - certs
+      parameters:
+        - $ref: "#/components/parameters/CertID"
+      responses:
+        '200':
+          $ref: "#/components/responses/CertRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        "401":
+          description: Missing or invalid access token provided.
+        '404':
+          description: |
+            Failed to retrieve corresponding certificate.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    delete:
+      summary: Revokes a certificate
+      description: |
+        Revokes a certificate for a given cert ID.
+      tags:
+        - certs
+      parameters:
+        - $ref: "#/components/parameters/CertID"
+      responses:
+        '200':
+          $ref: "#/components/responses/RevokeRes"
+        "401":
+          description: Missing or invalid access token provided.
+        '404':
+          description: |
+            Failed to revoke corresponding certificate.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /serials/{thingID}:
+    get:
+      summary: Retrieves certificates' serial IDs
+      description: |
+        Retrieves a list of certificates' serial IDs for a given thing ID.
+      tags:
+        - certs
+      parameters:
+        - $ref: "#/components/parameters/ThingID"
+      responses:
+        '200':
+          $ref: "#/components/responses/SerialsPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        "401":
+          description: Missing or invalid access token provided.
+        '404':
+          description: |
+            Failed to retrieve corresponding certificates.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  parameters:
+    ThingID:
+      name: thingID
+      description: Thing ID
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    CertID:
+      name: certID
+      description: Serial of certificate
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+
+  schemas:
+    Cert:
+      type: object
+      properties:
+        thing_id:
+          type: string
+          format: uuid
+          description: Corresponding Mainflux Thing ID.
+        client_cert:
+          type: string
+          description: Client Certificate.
+        client_key:
+          type: string
+          description: Key for the client_cert.
+        issuing_ca:
+          type: string
+          description: CA Certificate that is used to issue client certs, usually intermediate.
+        serial:
+          type: string
+          description: Certificate serial
+        expire:
+          type: string
+          description: Certificate expiry date
+    Serial:
+      type: object
+      properties:
+        serial:
+          type: string
+          description: Certificate serial
+    CertsPage:
+      type: object
+      properties:
+        certs:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/Cert"
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+    SerialsPage:
+      type: object
+      properties:
+        serials:
+          type: array
+          description: Certificate serials IDs.
+          minItems: 0
+          uniqueItems: true
+          items:
+            type: string
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+    Revoke:
+      type: object
+      properties:
+        revocation_time:
+          type: string
+          description: Certificate revocation time
+
+  requestBodies:
+    CertReq:
+      description: |
+          Issues a certificate that is required for mTLS. To create a certificate for a thing
+          provide a thing id, data identifying particular thing will be embedded into the Certificate.
+          x509 and ECC certificates are supported when using when Vault is used as PKI.
+      content:
+        application/json:
+          schema:
+            type: object
+            required:
+              - thing_id
+              - ttl
+              - key_bits
+              - key_type
+            properties:
+               thing_id:
+                 type: string
+                 format: uuid
+               ttl:
+                 type: string
+               key_type:
+                 type: string
+               key_bits:
+                 type: integer
+
+  responses:
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    CertRes:
+      description: Certificate data.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Cert"
+    CertsPageRes:
+      description: Certificates page.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/CertsPage"
+    SerialsPageRes:
+      description: Serials page.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/SerialsPage"
+    RevokeRes:
+      description: Certificate revoked.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Revoke"
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,220 @@
+openapi: 3.0.1
+info:
+  title: Mainflux Notifiers service
+  description: HTTP API for Notifiers service.
+  version: "1.0.0"
+paths:
+  /subscriptions:
+    post:
+      summary: Create subscription
+      description: Creates a new subscription give a topic and contact.
+      tags:
+        - notifiers
+      requestBody:
+        $ref: "#/components/requestBodies/Create"
+      responses:
+        "201":
+          $ref: "#/components/responses/Create"
+        "400":
+          description: Failed due to malformed JSON.
+        "409":
+          description: Failed due to using an existing topic and contact.
+        "415":
+          description: Missing or invalid content type.
+        "500":
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: List subscriptions
+      description: List subscriptions given list parameters.
+      tags:
+        - notifiers
+      parameters:
+        - $ref: "#/components/parameters/Topic"
+        - $ref: "#/components/parameters/Contact"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Limit"
+      responses:
+        "200":
+          $ref: "#/components/responses/Page"
+        "400":
+          description: Failed due to malformed query parameters.
+        "401":
+          description: Missing or invalid access token provided.
+        "500":
+          $ref: "#/components/responses/ServiceError"
+  /subscriptions/{id}:
+    get:
+      summary: Get subscription with the provided id
+      description: Retrieves a subscription with the provided id.
+      tags:
+        - notifiers
+      parameters:
+        - $ref: "#/components/parameters/Id"
+      responses:
+        "200":
+          $ref: "#/components/responses/View"
+        "401":
+          description: Missing or invalid access token provided.
+        "500":
+          $ref: "#/components/responses/ServiceError"
+    delete:
+      summary: Delete subscription with the provided id
+      description: Removes a subscription with the provided id.
+      tags:
+        - notifiers
+      parameters:
+        - $ref: "#/components/parameters/Id"
+      responses:
+        "204":
+          description: Subscription removed
+        "401":
+          description: Missing or invalid access token provided.
+        "500":
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    Subscription:
+      type: object
+      properties:
+        id:
+          type: string
+          format: ulid
+          example: 01EWDVKBQSG80B6PQRS9PAAY35
+          description: ULID id of the subscription.
+        owner_id:
+          type: string
+          format: uuid
+          example: 18167738-f7a8-4e96-a123-58c3cd14de3a
+          description: An id of the owner who created subscription.
+        topic:
+          type: string
+          example: topic.subtopic
+          description: Topic to which the user subscribes.
+        contact:
+          type: string
+          example: user@example.com
+          description: The contact of the user to which the notification will be sent.
+    Page:
+      type: object
+      properties:
+        subscriptions:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/Subscription"
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+
+  parameters:
+    Id:
+      name: id
+      description: Unique identifier.
+      in: path
+      schema:
+        type: string
+        format: ulid
+      required: true
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+    Topic:
+      name: topic
+      description: Topic name.
+      in: query
+      schema:
+        type: string
+      required: false
+    Contact:
+      name: contact
+      description: Subscription contact.
+      in: query
+      schema:
+        type: string
+      required: false
+
+  requestBodies:
+    Create:
+      description: JSON-formatted document describing the new subscription to be created
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Subscription"
+
+  responses:
+    Create:
+      description: Created a new subscription.
+      headers:
+        Location:
+          content:
+            text/plain:
+              schema:
+                type: string
+                description: Created subscription relative URL
+                example: /subscriptions/{id}
+    View:
+      description: View subscription.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Subscription"
+    Page:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/Page"
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,162 @@
+openapi: 3.0.1
+info:
+  title: Mainflux http adapter
+  description: HTTP API for sending messages through communication channels.
+  version: "1.0.0"
+paths:
+  /channels/{id}/messages:
+    post:
+      summary: Sends message to the communication channel
+      description: |
+        Sends message to the communication channel. Messages can be sent as
+        JSON formatted SenML or as blob.
+      tags:
+        - messages
+      parameters:
+        - $ref: "#/components/parameters/ID"
+      requestBody:
+        $ref: "#/components/requestBodies/MessageReq"
+      responses:
+        "202":
+          description: Message is accepted for processing.
+        "400":
+          description: Message discarded due to its malformed content.
+        "401":
+          description: Missing or invalid access token provided.
+        "404":
+          description: Message discarded due to invalid channel id.
+        "415":
+          description: Message discarded due to invalid or missing content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    SenMLRecord:
+      type: object
+      properties:
+        bn:
+          type: string
+          description: Base Name
+        bt:
+          type: number
+          format: double
+          description: Base Time
+        bu:
+          type: number
+          format: double
+          description: Base Unit
+        bv:
+          type: number
+          format: double
+          description: Base Value
+        bs:
+          type: number
+          format: double
+          description: Base Sum
+        bver:
+          type: number
+          format: double
+          description: Version
+        n:
+          type: string
+          description: Name
+        u:
+          type: string
+          description: Unit
+        v:
+          type: number
+          format: double
+          description: Value
+        vs:
+          type: string
+          description: String Value
+        vb:
+          type: boolean
+          description: Boolean Value
+        vd:
+          type: string
+          description: Data Value
+        s:
+          type: number
+          format: double
+          description: Value Sum
+        t:
+          type: number
+          format: double
+          description: Time
+        ut:
+          type: number
+          format: double
+          description: Update Time
+    SenMLArray:
+      type: array
+      items:
+        $ref: "#/components/schemas/SenMLRecord"
+
+  parameters:
+    ID:
+      name: id
+      description: Unique channel identifier.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+
+  requestBodies:
+    MessageReq:
+      description: |
+        Message to be distributed. Since the platform expects messages to be
+        properly formatted SenML in order to be post-processed, clients are
+        obliged to specify Content-Type header for each published message.
+        Note that all messages that aren't SenML will be accepted and published,
+        but no post-processing will be applied.
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/SenMLArray"
+
+  responses:
+    ServiceError:
+      description: Unexpected server-side error occurred.
+      content:
+        application/json:
+          schema:
+            type: string
+            format: byte
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: uuid
+      description: |
+        * Thing access: "Authorization: Thing <thing_key>"
+
+    basicAuth:
+      type: http
+      scheme: basic
+      description: |
+        * Things access: "Authorization: Basic <base64-encoded_credentials>"
+
+security:
+  - bearerAuth: []
+  - basicAuth: []
@@ -0,0 +1,94 @@
+openapi: 3.0.1
+info:
+  title: Mainflux Provision service
+  description: HTTP API for Provision service
+  version: "1.0.0"
+
+paths:
+  /mapping:
+    post:
+      summary: Adds new device to proxy
+      description: Adds new device to proxy
+      tags:
+        - provision
+      requestBody:
+        $ref: "#/components/requestBodies/ProvisionReq"
+      responses:
+        '201':
+          description: Created
+        '400':
+          description: Failed due to malformed JSON.
+        "401":
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: Gets current mapping.
+      description: Gets current mapping. This can be used in UI
+        so that when bootstrap config is created from UI matches
+        configuration created with provision service.
+      tags:
+        - provision
+      responses:
+        '200':
+          $ref: "#/components/responses/ProvisionRes"
+        "401":
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  requestBodies:
+    ProvisionReq:
+      description: MAC address of device or other identifier
+      content:
+        application/json:
+          schema:
+            type: object
+            required:
+              - external_id
+              - external_key
+            properties:
+              external_id:
+                type: string
+              external_key:
+                 type: string
+              name:
+                 type: string
+
+  responses:
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    ProvisionRes:
+      description: Current mapping JSON representation.
+      content:
+        application/json:
+          schema:
+            type: object
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,241 @@
+openapi: 3.0.1
+info:
+  title: Mainflux reader service
+  description: HTTP API for reading messages.
+  version: "1.0.0"
+
+paths:
+  /channels/{chanId}/messages:
+    get:
+      summary: Retrieves messages sent to single channel
+      description: |
+        Retrieves a list of messages sent to specific channel. Due to
+        performance concerns, data is retrieved in subsets. The API readers must
+        ensure that the entire dataset is consumed either by making subsequent
+        requests, or by increasing the subset size of the initial request.
+      tags:
+        - messages
+      parameters:
+        - $ref: "#/components/parameters/ChanId"
+        - $ref: "#/components/parameters/Limit"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Publisher"
+        - $ref: "#/components/parameters/Name"
+        - $ref: "#/components/parameters/Value"
+        - $ref: "#/components/parameters/BoolValue"
+        - $ref: "#/components/parameters/StringValue"
+        - $ref: "#/components/parameters/DataValue"
+        - $ref: "#/components/parameters/From"
+        - $ref: "#/components/parameters/To"
+      responses:
+        '200':
+          $ref: "#/components/responses/MessagesPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    MessagesPage:
+      type: object
+      properties:
+        total:
+          type: number
+          description: Total number of items that are present on the system.
+        offset:
+          type: number
+          description: Number of items that were skipped during retrieval.
+        limit:
+          type: number
+          description: Size of the subset that was retrieved.
+        messages:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            type: object
+            properties:
+              channel:
+                type: integer
+                description: Unique channel id.
+              publisher:
+                type: integer
+                description: Unique publisher id.
+              protocol:
+                type: string
+                description: Protocol name.
+              name:
+                type: string
+                description: Measured parameter name.
+              unit:
+                type: string
+                description: Value unit.
+              value:
+                type: number
+                description: Measured value in number.
+              stringValue:
+                type: string
+                description: Measured value in string format.
+              boolValue:
+                type: boolean
+                description: Measured value in boolean format.
+              dataValue:
+                type: string
+                description: Measured value in binary format.
+              valueSum:
+                type: number
+                description: Sum value.
+              time:
+                type: number
+                description: Time of measurement.
+              updateTime:
+                type: number
+                description: Time of updating measurement.
+
+  parameters:
+    ChanId:
+      name: chanId
+      description: Unique channel identifier.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+    Publisher:
+      name: Publisher
+      description: Unique thing identifier.
+      in: query
+      schema:
+        type: string
+        format: uuid
+      required: false
+    Name:
+      name: name
+      description: SenML message name.
+      in: query
+      schema:
+        type: string
+      required: false
+    Value:
+      name: v
+      description: SenML message value.
+      in: query
+      schema:
+        type: string
+      required: false
+    BoolValue:
+      name: vb
+      description: SenML message bool value.
+      in: query
+      schema:
+        type: boolean
+      required: false
+    StringValue:
+      name: vs
+      description: SenML message string value.
+      in: query
+      schema:
+        type: string
+      required: false
+    DataValue:
+      name: vd
+      description: SenML message data value.
+      in: query
+      schema:
+        type: string
+      required: false
+    Comparator:
+      name: comparator
+      description: Value comparison operator.
+      in: query
+      schema:
+        type: string
+        default: eq
+        enum:
+          - eq
+          - lt
+          - le
+          - gt
+          - ge
+      required: false
+    From:
+      name: from
+      description: SenML message time in nanoseconds (integer part represents seconds).
+      in: query
+      schema:
+        type: number
+      required: false
+    To:
+      name: to
+      description: SenML message time in nanoseconds (integer part represents seconds).
+      in: query
+      schema:
+        type: number
+      required: false
+
+  responses:
+    MessagesPageRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/MessagesPage"
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+    thingAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: uuid
+      description: |
+        * Things access: "Authorization: Thing <thing_key>"
+
+security:
+  - bearerAuth: []
+  - thingAuth: []
@@ -0,0 +1,23 @@
+type: object
+properties:
+  status:
+    type: string
+    description: Service status.
+    enum:
+      - pass
+  version:
+    type: string
+    description: Service version.
+    example: 0.0.1
+  commit:
+    type: string
+    description: Service commit hash.
+    example: 7d6f4dc4f7f0c1fa3dc24eddfb18bb5073ff4f62
+  description:
+    type: string
+    description: Service description.
+    example: <service_name> service
+  build_time:
+    type: string
+    description: Service build time.
+    example: 1970-01-01_00:00:00
@@ -0,0 +1,379 @@
+openapi: 3.0.1
+info:
+  title: Mainflux twins service
+  description: HTTP API for managing digital twins and their states.
+  version: '1.0.0'
+
+paths:
+  /twins:
+    post:
+      summary: Adds new twin
+      description: |
+        Adds new twin to the list of twins owned by user identified using
+        the provided access token.
+      tags:
+        - twins
+      requestBody:
+        $ref: "#/components/requestBodies/TwinReq"
+      responses:
+        '201':
+          $ref: "#/components/responses/TwinCreateRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+
+    get:
+      summary: Retrieves twins
+      description: |
+        Retrieves a list of twins. Due to performance concerns, data
+        is retrieved in subsets.
+      tags:
+        - twins
+      parameters:
+        - $ref: '#/components/parameters/Limit'
+        - $ref: '#/components/parameters/Offset'
+        - $ref: '#/components/parameters/Name'
+        - $ref: '#/components/parameters/Metadata'
+      responses:
+        '200':
+          $ref: '#/components/responses/TwinsPageRes'
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+
+  /twins/{twinID}:
+    get:
+      summary: Retrieves twin info
+      tags:
+        - twins
+      parameters:
+        - $ref: '#/components/parameters/TwinID'
+      responses:
+        '200':
+          $ref: '#/components/responses/TwinRes'
+        '400':
+          description: Failed due to malformed twin's ID.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Twin does not exist.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+    put:
+      summary: Updates twin info
+      description: |
+        Update is performed by replacing the current resource data with values
+        provided in a request payload. Note that the twin's ID cannot be changed.
+      tags:
+        - twins
+      parameters:
+        - $ref: '#/components/parameters/TwinID'
+      requestBody:
+        $ref: '#/components/requestBodies/TwinReq'
+      responses:
+        '200':
+          description: Twin updated.
+        '400':
+          description: Failed due to malformed twin's ID or malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Twin does not exist.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+    delete:
+      summary: Removes a twin
+      description: Removes a twin.
+      tags:
+        - twins
+      parameters:
+        - $ref: '#/components/parameters/TwinID'
+      responses:
+        '204':
+          description: Twin removed.
+        '400':
+          description: Failed due to malformed twin's ID.
+        '401':
+          description: Missing or invalid access token provided
+        '404':
+          description: Twin does not exist.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+
+  /states/{twinID}:
+    get:
+      summary: Retrieves states of twin with id twinID
+      description: |
+        Retrieves a list of states. Due to performance concerns, data
+        is retrieved in subsets.
+      tags:
+        - states
+      parameters:
+        - $ref: '#/components/parameters/TwinID'
+        - $ref: '#/components/parameters/Limit'
+        - $ref: '#/components/parameters/Offset'
+      responses:
+        '200':
+          $ref: '#/components/responses/StatesPageRes'
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: Twin does not exist.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  parameters:
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+    Name:
+      name: name
+      description: Twin name
+      in: query
+      schema:
+        type: string
+      required: false
+    Metadata:
+      name: metadata
+      description: |
+        Metadata filter. Filtering is performed matching the parameter with
+        metadata on top level. Parameter is json.
+      in: query
+      schema:
+        type: string
+        minimum: 0
+      required: false
+    TwinID:
+      name: twinID
+      description: Unique twin identifier.
+      in: path
+      schema:
+        type: string
+        format: uuid
+        minimum: 1
+      required: true
+
+  schemas:
+    Attribute:
+      type: object
+      properties:
+        name:
+          type: string
+          description: Name of the attribute.
+        channel:
+          type: string
+          description: Mainflux channel used by attribute.
+        subtopic:
+          type: string
+          description: Subtopic used by attribute.
+        persist_state:
+          type: boolean
+          description: Trigger state creation based on the attribute.
+    Definition:
+      type: object
+      properties:
+        delta:
+          type: number
+          description: Minimal time delay before new state creation.
+        attributes:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: '#/components/schemas/Attribute'
+    TwinReqObj:
+      type: object
+      properties:
+        name:
+          type: string
+          description: Free-form twin name.
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded twin's data.
+        definition:
+          $ref: '#/components/schemas/Definition'
+    TwinResObj:
+      type: object
+      properties:
+        owner:
+          type: string
+          description: Email address of Mainflux user that owns twin.
+        id:
+          type: string
+          format: uuid
+          description: Unique twin identifier generated by the service.
+        name:
+          type: string
+          description: Free-form twin name.
+        revision:
+          type: number
+          description: Oridnal revision number of twin.
+        created:
+          type: string
+          format: date
+          description: Twin creation date and time.
+        updated:
+          type: string
+          format: date
+          description: Twin update date and time.
+        definitions:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: '#/components/schemas/Definition'
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded twin's data.
+    TwinsPage:
+      type: object
+      properties:
+        twins:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: '#/components/schemas/TwinResObj'
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+      required:
+        - twins
+    State:
+      type: object
+      properties:
+        twin_id:
+          type: string
+          format: uuid
+          description: ID of twin state belongs to.
+        id:
+          type: number
+          description: State position in a time row of states.
+        created:
+          type: string
+          format: date
+          description: State creation date.
+        payload:
+          type: object
+          description: Object-encoded states's payload.
+    StatesPage:
+      type: object
+      properties:
+        twins:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: '#/components/schemas/State'
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+      required:
+        - twins
+
+  requestBodies:
+    TwinReq:
+      description: JSON-formatted document describing the twin to create or update.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/TwinReqObj'
+      required: true
+
+  responses:
+    TwinCreateRes:
+      description: Created twin's relative URL (i.e. /twins/{twinID}).
+      headers:
+        Location:
+          content:
+            text/plain:
+              schema:
+                type: string
+    TwinRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/TwinResObj'
+    TwinsPageRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/TwinsPage'
+    StatesPageRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/StatesPage'
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,464 @@
+openapi: 3.0.1
+info:
+  title: Mainflux users service
+  description: HTTP API for managing platform users.
+  version: "1.0.0"
+
+paths:
+  /users:
+    post:
+      summary: Registers user account
+      description: |
+        Registers new user account given email and password. New account will
+        be uniquely identified by its email address.
+      tags:
+        - users
+      requestBody:
+        $ref: "#/components/requestBodies/UserCreateReq"
+      responses:
+        '201':
+          $ref: "#/components/responses/UserCreateRes"
+        '400':
+          description: Failed due to malformed JSON.
+        '401':
+          description: Missing or invalid access token provided.
+        '409':
+          description: Failed due to using an existing email address.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    get:
+      summary: Retrieves users
+      description: |
+        Retrieves a list of users. Due to performance concerns, data
+        is retrieved in subsets. The API things must ensure that the entire
+        dataset is consumed either by making subsequent requests, or by
+        increasing the subset size of the initial request.
+      tags:
+        - users
+      parameters:
+        - $ref: "#/components/parameters/Limit"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Metadata"
+      responses:
+        '200':
+          $ref: "#/components/responses/UsersPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: |
+            Missing or invalid access token provided.
+            This endpoint is available only for administrators.
+        '404':
+          description: A non-existent entity request.
+        '422':
+          description: Database can't process request.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+    put:
+      summary: Updates info on currently logged in user.
+      description: |
+        Updates info on currently logged in user. Info is updated using
+        authorization token and the new received info.
+      tags:
+        - users
+      requestBody:
+        $ref: "#/components/requestBodies/UserUpdateReq"
+      responses:
+        '200':
+          description: User updated.
+        '400':
+          description: Failed due to malformed JSON.
+        '404':
+          description: Failed due to non existing user.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+         $ref: "#/components/responses/ServiceError"
+  /users/profile:
+     get:
+      summary: Gets info on currently logged in user.
+      description: |
+        Gets info on currently logged in user. Info is obtained using
+        authorization token
+      tags:
+        - users
+      responses:
+        '200':
+          $ref: "#/components/responses/UserRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /groups/{groupId}:
+    get:
+      summary: Retrieves users
+      description: |
+        Retrieves a list of users that belong to a group. Due to performance concerns, data
+        is retrieved in subsets. The API things must ensure that the entire
+        dataset is consumed either by making subsequent requests, or by
+        increasing the subset size of the initial request.
+      tags:
+        - users
+      parameters:
+        - $ref: "#/components/parameters/GroupId"
+        - $ref: "#/components/parameters/Limit"
+        - $ref: "#/components/parameters/Offset"
+        - $ref: "#/components/parameters/Metadata"
+      responses:
+        '200':
+          $ref: "#/components/responses/UsersPageRes"
+        '400':
+          description: Failed due to malformed query parameters.
+        '401':
+          description: Missing or invalid access token provided.
+        '404':
+          description: A non-existent entity request.
+        '422':
+          description: Database can't process request.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /tokens:
+    post:
+      summary: User authentication
+      description: Generates an access token when provided with proper credentials.
+      tags:
+        - users
+      requestBody:
+        $ref: "#/components/requestBodies/UserCreateReq"
+      responses:
+        '201':
+          description: User authenticated.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Token'
+        '400':
+          description: Failed due to malformed JSON.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '401':
+          description: Failed due to using invalid credentials.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '415':
+          description: Missing or invalid content type.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
+        '500':
+          $ref: '#/components/responses/ServiceError'
+  /password/reset-request:
+    post:
+      summary: User password reset request
+      description: |
+        Generates a reset token and sends and
+        email with link for resetting password.
+      tags:
+        - users
+      parameters:
+        - $ref: "#/components/parameters/Referer"
+      requestBody:
+        $ref: '#/components/requestBodies/RequestPasswordReset'
+      responses:
+        '201':
+          description: Users link for reseting password.
+        '400':
+          description: Failed due to malformed JSON.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+  /password/reset:
+    put:
+      summary: User password reset endpoint
+      description: |
+        When user gets reset token, after he submited
+        email to `/password/reset-request`, posting a
+          new password along to this endpoint will change password.
+      tags:
+        - users
+      requestBody:
+        $ref: '#/components/requestBodies/PasswordReset'
+      responses:
+        '201':
+          description: User link .
+        '400':
+          description: Failed due to malformed JSON.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: '#/components/responses/ServiceError'
+  /password:
+    patch:
+      summary: User password change endpoint
+      description: |
+        When authenticated user wants to change password.
+      tags:
+        - users
+      requestBody:
+        $ref: '#/components/requestBodies/PasswordChange'
+      responses:
+        '201':
+          description: User link .
+        '400':
+          description: Failed due to malformed JSON.
+        '415':
+          description: Missing or invalid content type.
+        '500':
+          $ref: "#/components/responses/ServiceError"
+  /health:
+    get:
+      summary: Retrieves service health check info.
+      tags:
+        - health
+      responses:
+        '200':
+          $ref: "#/components/responses/HealthRes"
+        '500':
+          $ref: "#/components/responses/ServiceError"
+
+components:
+  schemas:
+    Token:
+      type: object
+      properties:
+        token:
+          type: string
+          format: jwt
+          description: Generated access token.
+      required:
+        - token
+    UserReqObj:
+      type: object
+      properties:
+        email:
+          type: string
+          format: email
+          example: "test@example.com"
+          description: User's email address will be used as its unique identifier
+        password:
+          type: string
+          format: password
+          minimum: 8
+          description: Free-form account password used for acquiring auth token(s).
+      required:
+        - email
+        - password
+    User:
+      type: object
+      properties:
+        id:
+          type: string
+          format: uuid
+          example: 18167738-f7a8-4e96-a123-58c3cd14de3a
+          description: User unique identifier.
+        email:
+          type: string
+          format: email
+          example: "test@example.com"
+          description: User's email address will be used as its unique identifier.
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded user's data.
+    UsersPage:
+      type: object
+      properties:
+        things:
+          type: array
+          minItems: 0
+          uniqueItems: true
+          items:
+            $ref: "#/components/schemas/User"
+        total:
+          type: integer
+          description: Total number of items.
+        offset:
+          type: integer
+          description: Number of items to skip during retrieval.
+        limit:
+          type: integer
+          description: Maximum number of items to return in one page.
+      required:
+        - things
+    UserMetadata:
+      type: object
+      properties:
+        metadata:
+          type: object
+          description: Arbitrary, object-encoded user's data.
+    Error:
+      type: object
+      properties:
+        error:
+          type: string
+          description: Error message
+
+  parameters:
+    Referer:
+      name: Referer
+      description: Host being sent by browser.
+      in: header
+      schema:
+        type: string
+      required: true
+    Metadata:
+      name: metadata
+      description: Metadata filter. Filtering is performed matching the parameter with metadata on top level. Parameter is json.
+      in: query
+      schema:
+        type: string
+        minimum: 0
+      required: false
+    UserID:
+      name: userId
+      description: Unique user identifier.
+      in: path
+      schema:
+        type: string
+        format: uuid
+      required: true
+    GroupId:
+      name: groupId
+      description: Unique group identifier.
+      in: path
+      schema:
+        type: string
+        format: ulid
+      required: true
+    Limit:
+      name: limit
+      description: Size of the subset to retrieve.
+      in: query
+      schema:
+        type: integer
+        default: 10
+        maximum: 100
+        minimum: 1
+      required: false
+    Offset:
+      name: offset
+      description: Number of items to skip during retrieval.
+      in: query
+      schema:
+        type: integer
+        default: 0
+        minimum: 0
+      required: false
+
+  requestBodies:
+    UserCreateReq:
+      description: JSON-formatted document describing the new user to be registered
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/UserReqObj'
+    UserUpdateReq:
+      description: JSON-formated document describing the metadata of user to be update
+      required: true
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/UserMetadata"
+    RequestPasswordReset:
+      description: Initiate password request procedure.
+      required: true
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              email:
+                type: string
+                format: email
+                description: User email.
+    PasswordReset:
+      description: Password reset request data, new password and token that is appended on password reset link received in email.
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              password:
+                type: string
+                format: password
+                description: New password.
+                minimum: 8
+              confirm_password:
+                type: string
+                format: password
+                description: New confirmation password.
+                minimum: 8
+              token:
+                type: string
+                format: jwt
+                description: Reset token generated and sent in email.
+    PasswordChange:
+      description: Password change data. User can change its password.
+      required: true
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              password:
+                type: string
+                format: password
+                description: New password.
+              old_password:
+                type: string
+                format: password
+                description: Old password.
+
+  responses:
+    UserCreateRes:
+      description: Registered new user.
+      headers:
+        Location:
+          content:
+            text/plain:
+              schema:
+                type: string
+                format: url
+                description: Registered user relative URL.
+                example: /users/{userId}
+    UserRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/User"
+    UsersPageRes:
+      description: Data retrieved.
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/UsersPage"
+    ServiceError:
+      description: Unexpected server-side error occurred.
+    HealthRes:
+      description: Service Health Check.
+      content:
+        application/json:
+          schema:
+            $ref: "./schemas/HealthInfo.yml"
+
+  securitySchemes:
+    bearerAuth:
+      type: http
+      scheme: bearer
+      bearerFormat: JWT
+      description: |
+        * Users access: "Authorization: Bearer <user_token>"
+
+security:
+  - bearerAuth: []
@@ -0,0 +1,129 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+syntax = "proto3";
+
+package mainflux;
+
+import "google/protobuf/empty.proto";
+
+service ThingsService {
+    rpc CanAccessByKey(AccessByKeyReq) returns (ThingID) {}
+    rpc IsChannelOwner(ChannelOwnerReq) returns (google.protobuf.Empty) {}
+    rpc CanAccessByID(AccessByIDReq) returns (google.protobuf.Empty) {}
+    rpc Identify(Token) returns (ThingID) {}
+}
+
+service AuthService {
+    rpc Issue(IssueReq) returns (Token) {}
+    rpc Identify(Token) returns (UserIdentity) {}
+    rpc Authorize(AuthorizeReq) returns (AuthorizeRes) {}
+    rpc AddPolicy(AddPolicyReq) returns (AddPolicyRes) {}
+    rpc DeletePolicy(DeletePolicyReq) returns (DeletePolicyRes) {}
+    rpc ListPolicies(ListPoliciesReq) returns (ListPoliciesRes) {}
+    rpc Assign(Assignment) returns(google.protobuf.Empty) {}
+    rpc Members(MembersReq) returns (MembersRes) {}
+}
+
+message AccessByKeyReq {
+    string token  = 1;
+    string chanID = 2;
+}
+
+message ChannelOwnerReq {
+    string owner  = 1;
+    string chanID = 2;
+}
+
+message ThingID {
+    string value = 1;
+}
+
+message ChannelID {
+    string value = 1;
+}
+
+message AccessByIDReq {
+    string thingID = 1;
+    string chanID  = 2;
+}
+
+// If a token is not carrying any information itself, the type
+// field can be used to determine how to validate the token.
+// Also, different tokens can be encoded in different ways.
+message Token {
+    string value = 1;
+}
+
+message UserIdentity {
+    string id    = 1;
+    string email = 2;
+}
+
+message IssueReq {
+    string id    = 1;
+    string email = 2;
+    uint32 type  = 3;
+}
+
+message AuthorizeReq {
+    string sub = 1;
+    string obj = 2;
+    string act = 3;
+}
+
+message AuthorizeRes {
+    bool authorized = 1;
+}
+
+message AddPolicyReq {
+    string sub = 1;
+    string obj = 2;
+    string act = 3;
+}
+
+message AddPolicyRes {
+    bool authorized = 1;
+}
+
+message DeletePolicyReq {
+    string sub = 1;
+    string obj = 2;
+    string act = 3;
+}
+
+message DeletePolicyRes {
+    bool deleted = 1;
+}
+
+message ListPoliciesReq {
+    string sub = 1;
+    string obj = 2;
+    string act = 3;
+}
+
+message ListPoliciesRes {
+    repeated string policies = 1;
+}
+
+message Assignment {
+    string token    = 1;
+    string groupID  = 2;
+    string memberID = 3;
+}
+
+message MembersReq {
+    string token    = 1;
+    string groupID  = 2;
+    uint64 offset   = 3;
+    uint64 limit    = 4;
+    string type     = 5;
+}
+
+message MembersRes {
+    uint64 total            = 1;
+    uint64 offset           = 2;
+    uint64 limit            = 3;
+    string type             = 4;
+    repeated string members = 5;
+}
@@ -0,0 +1,113 @@
+# Auth - Authentication and Authorization service
+
+Auth service provides authentication features as an API for managing authentication keys as well as administering groups of entities - `things` and `users`. 
+
+# Authentication
+User service is using Auth service gRPC API to obtain login token or password reset token. Authentication key consists of the following fields:
+- ID - key ID
+- Type - one of the three types described below
+- IssuerID - an ID of the Mainflux User who issued the key
+- Subject - user email
+- IssuedAt - the timestamp when the key is issued
+- ExpiresAt - the timestamp after which the key is invalid
+
+There are *three types of authentication keys*:
+
+- User key - keys issued to the user upon login request
+- API key - keys issued upon the user request
+- Recovery key - password recovery key
+
+Authentication keys are represented and distributed by the corresponding [JWT](jwt.io).
+
+User keys are issued when user logs in. Each user request (other than `registration` and `login`) contains user key that is used to authenticate the user.
+
+API keys are similar to the User keys. The main difference is that API keys have configurable expiration time. If no time is set, the key will never expire. For that reason, API keys are _the only key type that can be revoked_. This also means that, despite being used as a JWT, it requires a query to the database to validate the API key. The user with API key can perform all the same actions as the user with login key (can act on behalf of the user for Thing, Channel, or user profile management), *except issuing new API keys*.
+
+Recovery key is the password recovery key. It's short-lived token used for password recovery process.
+
+For in-depth explanation of the aforementioned scenarios, as well as thorough
+understanding of Mainflux, please check out the [official documentation][doc].
+
+The following actions are supported:
+
+- create (all key types)
+- verify (all key types)
+- obtain (API keys only)
+- revoke (API keys only)
+
+# Groups
+User and Things service are using Auth gRPC API to get the list of ids that are part of a group. Groups can be organized as tree structure.
+Group consists of the following fields:
+
+- ID - ULID id uniquely representing group
+- Name - name of the group, name of the group is unique at the same level of tree hierarchy for a given tree.
+- ParentID - id of the parent group
+- OwnerID - id of the user that created a group
+- Description - free form text, up to 1024 characters
+- Metadata - Arbitrary, object-encoded group's data
+- Path - tree path consisting of group ids
+- CreatedAt - timestamp at which the group is created
+- UpdatedAt - timestamp at which the group is updated
+
+## Configuration
+
+The service is configured using the environment variables presented in the
+following table. Note that any unset variables will be replaced with their
+default values.
+
+| Variable                      | Description                                                              | Default        |
+|-------------------------------|--------------------------------------------------------------------------|----------------|
+| MF_AUTH_LOG_LEVEL             | Service level (debug, info, warn, error)                                 | error          |
+| MF_AUTH_DB_HOST               | Database host address                                                    | localhost      |
+| MF_AUTH_DB_PORT               | Database host port                                                       | 5432           |
+| MF_AUTH_DB_USER               | Database user                                                            | mainflux       |
+| MF_AUTH_DB_PASSWORD           | Database password                                                        | mainflux       |
+| MF_AUTH_DB                    | Name of the database used by the service                                 | auth           |
+| MF_AUTH_DB_SSL_MODE           | Database connection SSL mode (disable, require, verify-ca, verify-full)  | disable        |
+| MF_AUTH_DB_SSL_CERT           | Path to the PEM encoded certificate file                                 |                |
+| MF_AUTH_DB_SSL_KEY            | Path to the PEM encoded key file                                         |                |
+| MF_AUTH_DB_SSL_ROOT_CERT      | Path to the PEM encoded root certificate file                            |                |
+| MF_AUTH_HTTP_PORT             | Auth service HTTP port                                                   | 8180           |
+| MF_AUTH_GRPC_PORT             | Auth service gRPC port                                                   | 8181           |
+| MF_AUTH_SERVER_CERT           | Path to server certificate in pem format                                 |                |
+| MF_AUTH_SERVER_KEY            | Path to server key in pem format                                         |                |
+| MF_AUTH_SECRET                | String used for signing tokens                                           | auth           |
+| MF_AUTH_LOGIN_TOKEN_DURATION  | The login token expiration period                                        | 10h            |
+| MF_JAEGER_URL                 | Jaeger server URL                                                        | localhost:6831 |
+| MF_KETO_READ_REMOTE_HOST      | Keto Read Host                                                           | mainflux-keto  |
+| MF_KETO_WRITE_REMOTE_HOST     | Keto Write Host                                                          | mainflux-keto  |
+| MF_KETO_READ_REMOTE_PORT      | Keto Read Port                                                           | 4466           |
+| MF_KETO_WRITE_REMOTE_PORT     | Keto Write Port                                                          | 4467           |
+
+## Deployment
+
+The service itself is distributed as Docker container. Check the [`auth`](https://github.com/mainflux/mainflux/blob/master/docker/docker-compose.yml#L71-L94) service section in 
+docker-compose to see how service is deployed.
+
+
+To start the service outside of the container, execute the following shell script:
+
+```bash
+# download the latest version of the service
+go get github.com/mainflux/mainflux
+
+cd $GOPATH/src/github.com/mainflux/mainflux
+
+# compile the service
+make auth
+
+# copy binary to bin
+make install
+
+# set the environment variables and run the service
+MF_AUTH_LOG_LEVEL=[Service log level] MF_AUTH_DB_HOST=[Database host address] MF_AUTH_DB_PORT=[Database host port] MF_AUTH_DB_USER=[Database user] MF_AUTH_DB_PASS=[Database password] MF_AUTH_DB=[Name of the database used by the service] MF_AUTH_DB_SSL_MODE=[SSL mode to connect to the database with] MF_AUTH_DB_SSL_CERT=[Path to the PEM encoded certificate file] MF_AUTH_DB_SSL_KEY=[Path to the PEM encoded key file] MF_AUTH_DB_SSL_ROOT_CERT=[Path to the PEM encoded root certificate file] MF_AUTH_HTTP_PORT=[Service HTTP port] MF_AUTH_GRPC_PORT=[Service gRPC port] MF_AUTH_SECRET=[String used for signing tokens] MF_AUTH_SERVER_CERT=[Path to server certificate] MF_AUTH_SERVER_KEY=[Path to server key] MF_JAEGER_URL=[Jaeger server URL] MF_AUTH_LOGIN_TOKEN_DURATION=[The login token expiration period] $GOBIN/mainflux-auth
+```
+
+If `MF_EMAIL_TEMPLATE` doesn't point to any file service will function but password reset functionality will not work.
+
+## Usage
+
+For more information about service capabilities and its usage, please check out
+the [API documentation](https://api.mainflux.io/?urls.primaryName=auth-openapi.yml).
+
+[doc]: https://docs.mainflux.io
@@ -0,0 +1,5 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package api contains implementation of Auth service HTTP API.
+package api
@@ -0,0 +1,334 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/endpoint"
+	kitot "github.com/go-kit/kit/tracing/opentracing"
+	kitgrpc "github.com/go-kit/kit/transport/grpc"
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/mainflux/mainflux"
+	opentracing "github.com/opentracing/opentracing-go"
+	"google.golang.org/grpc"
+)
+
+const (
+	svcName = "mainflux.AuthService"
+)
+
+var _ mainflux.AuthServiceClient = (*grpcClient)(nil)
+
+type grpcClient struct {
+	issue        endpoint.Endpoint
+	identify     endpoint.Endpoint
+	authorize    endpoint.Endpoint
+	addPolicy    endpoint.Endpoint
+	deletePolicy endpoint.Endpoint
+	listPolicies endpoint.Endpoint
+	assign       endpoint.Endpoint
+	members      endpoint.Endpoint
+	timeout      time.Duration
+}
+
+// NewClient returns new gRPC client instance.
+func NewClient(tracer opentracing.Tracer, conn *grpc.ClientConn, timeout time.Duration) mainflux.AuthServiceClient {
+	return &grpcClient{
+		issue: kitot.TraceClient(tracer, "issue")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"Issue",
+			encodeIssueRequest,
+			decodeIssueResponse,
+			mainflux.UserIdentity{},
+		).Endpoint()),
+		identify: kitot.TraceClient(tracer, "identify")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"Identify",
+			encodeIdentifyRequest,
+			decodeIdentifyResponse,
+			mainflux.UserIdentity{},
+		).Endpoint()),
+		authorize: kitot.TraceClient(tracer, "authorize")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"Authorize",
+			encodeAuthorizeRequest,
+			decodeAuthorizeResponse,
+			mainflux.AuthorizeRes{},
+		).Endpoint()),
+		addPolicy: kitot.TraceClient(tracer, "add_policy")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"AddPolicy",
+			encodeAddPolicyRequest,
+			decodeAddPolicyResponse,
+			mainflux.AddPolicyRes{},
+		).Endpoint()),
+		deletePolicy: kitot.TraceClient(tracer, "delete_policy")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"DeletePolicy",
+			encodeDeletePolicyRequest,
+			decodeDeletePolicyResponse,
+			mainflux.DeletePolicyRes{},
+		).Endpoint()),
+		listPolicies: kitot.TraceClient(tracer, "list_policies")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"ListPolicies",
+			encodeListPoliciesRequest,
+			decodeListPoliciesResponse,
+			mainflux.ListPoliciesRes{},
+		).Endpoint()),
+		assign: kitot.TraceClient(tracer, "assign")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"Assign",
+			encodeAssignRequest,
+			decodeAssignResponse,
+			mainflux.AuthorizeRes{},
+		).Endpoint()),
+		members: kitot.TraceClient(tracer, "members")(kitgrpc.NewClient(
+			conn,
+			svcName,
+			"Members",
+			encodeMembersRequest,
+			decodeMembersResponse,
+			mainflux.MembersRes{},
+		).Endpoint()),
+
+		timeout: timeout,
+	}
+}
+
+func (client grpcClient) Issue(ctx context.Context, req *mainflux.IssueReq, _ ...grpc.CallOption) (*mainflux.Token, error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.issue(ctx, issueReq{id: req.GetId(), email: req.GetEmail(), keyType: req.Type})
+	if err != nil {
+		return nil, err
+	}
+
+	ir := res.(identityRes)
+	return &mainflux.Token{Value: ir.id}, nil
+}
+
+func encodeIssueRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(issueReq)
+	return &mainflux.IssueReq{Id: req.id, Email: req.email, Type: req.keyType}, nil
+}
+
+func decodeIssueResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.UserIdentity)
+	return identityRes{id: res.GetId(), email: res.GetEmail()}, nil
+}
+
+func (client grpcClient) Identify(ctx context.Context, token *mainflux.Token, _ ...grpc.CallOption) (*mainflux.UserIdentity, error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.identify(ctx, identityReq{token: token.GetValue()})
+	if err != nil {
+		return nil, err
+	}
+
+	ir := res.(identityRes)
+	return &mainflux.UserIdentity{Id: ir.id, Email: ir.email}, nil
+}
+
+func encodeIdentifyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(identityReq)
+	return &mainflux.Token{Value: req.token}, nil
+}
+
+func decodeIdentifyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.UserIdentity)
+	return identityRes{id: res.GetId(), email: res.GetEmail()}, nil
+}
+
+func (client grpcClient) Authorize(ctx context.Context, req *mainflux.AuthorizeReq, _ ...grpc.CallOption) (r *mainflux.AuthorizeRes, err error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.authorize(ctx, authReq{Act: req.GetAct(), Obj: req.GetObj(), Sub: req.GetSub()})
+	if err != nil {
+		return &mainflux.AuthorizeRes{}, err
+	}
+
+	ar := res.(authorizeRes)
+	return &mainflux.AuthorizeRes{Authorized: ar.authorized}, err
+}
+
+func decodeAuthorizeResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.AuthorizeRes)
+	return authorizeRes{authorized: res.Authorized}, nil
+}
+
+func encodeAuthorizeRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(authReq)
+	return &mainflux.AuthorizeReq{
+		Sub: req.Sub,
+		Obj: req.Obj,
+		Act: req.Act,
+	}, nil
+}
+
+func (client grpcClient) AddPolicy(ctx context.Context, in *mainflux.AddPolicyReq, opts ...grpc.CallOption) (*mainflux.AddPolicyRes, error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.addPolicy(ctx, policyReq{Act: in.GetAct(), Obj: in.GetObj(), Sub: in.GetSub()})
+	if err != nil {
+		return &mainflux.AddPolicyRes{}, err
+	}
+
+	apr := res.(addPolicyRes)
+	return &mainflux.AddPolicyRes{Authorized: apr.authorized}, err
+}
+
+func decodeAddPolicyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.AddPolicyRes)
+	return addPolicyRes{authorized: res.Authorized}, nil
+}
+
+func encodeAddPolicyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(policyReq)
+	return &mainflux.AddPolicyReq{
+		Sub: req.Sub,
+		Obj: req.Obj,
+		Act: req.Act,
+	}, nil
+}
+
+func (client grpcClient) DeletePolicy(ctx context.Context, in *mainflux.DeletePolicyReq, opts ...grpc.CallOption) (*mainflux.DeletePolicyRes, error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.deletePolicy(ctx, policyReq{Act: in.GetAct(), Obj: in.GetObj(), Sub: in.GetSub()})
+	if err != nil {
+		return &mainflux.DeletePolicyRes{}, err
+	}
+
+	dpr := res.(deletePolicyRes)
+	return &mainflux.DeletePolicyRes{Deleted: dpr.deleted}, err
+}
+
+func decodeDeletePolicyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.DeletePolicyRes)
+	return deletePolicyRes{deleted: res.GetDeleted()}, nil
+}
+
+func encodeDeletePolicyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(policyReq)
+	return &mainflux.DeletePolicyReq{
+		Sub: req.Sub,
+		Obj: req.Obj,
+		Act: req.Act,
+	}, nil
+}
+
+func (client grpcClient) ListPolicies(ctx context.Context, in *mainflux.ListPoliciesReq, opts ...grpc.CallOption) (*mainflux.ListPoliciesRes, error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.listPolicies(ctx, listPoliciesReq{Obj: in.GetObj(), Act: in.GetAct(), Sub: in.GetSub()})
+	if err != nil {
+		return &mainflux.ListPoliciesRes{}, err
+	}
+
+	lpr := res.(listPoliciesRes)
+	return &mainflux.ListPoliciesRes{Policies: lpr.policies}, err
+}
+
+func decodeListPoliciesResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.ListPoliciesRes)
+	return listPoliciesRes{policies: res.GetPolicies()}, nil
+}
+
+func encodeListPoliciesRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(listPoliciesReq)
+	return &mainflux.ListPoliciesReq{
+		Sub: req.Sub,
+		Obj: req.Obj,
+		Act: req.Act,
+	}, nil
+}
+
+func (client grpcClient) Members(ctx context.Context, req *mainflux.MembersReq, _ ...grpc.CallOption) (r *mainflux.MembersRes, err error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	res, err := client.members(ctx, membersReq{
+		token:      req.GetToken(),
+		groupID:    req.GetGroupID(),
+		memberType: req.GetType(),
+		offset:     req.GetOffset(),
+		limit:      req.GetLimit(),
+	})
+	if err != nil {
+		return &mainflux.MembersRes{}, err
+	}
+
+	mr := res.(membersRes)
+
+	return &mainflux.MembersRes{
+		Offset:  mr.offset,
+		Limit:   mr.limit,
+		Total:   mr.total,
+		Type:    mr.groupType,
+		Members: mr.members,
+	}, err
+}
+
+func encodeMembersRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(membersReq)
+	return &mainflux.MembersReq{
+		Token:   req.token,
+		Offset:  req.offset,
+		Limit:   req.limit,
+		GroupID: req.groupID,
+		Type:    req.memberType,
+	}, nil
+}
+
+func decodeMembersResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.MembersRes)
+	return membersRes{
+		offset:  res.Offset,
+		limit:   res.Limit,
+		total:   res.Total,
+		members: res.Members,
+	}, nil
+}
+
+func (client grpcClient) Assign(ctx context.Context, req *mainflux.Assignment, _ ...grpc.CallOption) (r *empty.Empty, err error) {
+	ctx, close := context.WithTimeout(ctx, client.timeout)
+	defer close()
+
+	_, err = client.assign(ctx, assignReq{token: req.GetToken(), groupID: req.GetGroupID(), memberID: req.GetMemberID()})
+	if err != nil {
+		return &empty.Empty{}, err
+	}
+
+	return &empty.Empty{}, err
+}
+
+func encodeAssignRequest(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(*mainflux.AuthorizeRes)
+	return authorizeRes{authorized: res.Authorized}, nil
+}
+
+func decodeAssignResponse(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(authReq)
+	return &mainflux.AuthorizeReq{
+		Sub: req.Sub,
+		Obj: req.Obj,
+		Act: req.Act,
+	}, nil
+}
@@ -0,0 +1,5 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package grpc contains implementation of Auth service gRPC API.
+package grpc
@@ -0,0 +1,163 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/endpoint"
+	"github.com/mainflux/mainflux/auth"
+)
+
+func issueEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(issueReq)
+		if err := req.validate(); err != nil {
+			return issueRes{}, err
+		}
+
+		key := auth.Key{
+			Type:     req.keyType,
+			Subject:  req.email,
+			IssuerID: req.id,
+			IssuedAt: time.Now().UTC(),
+		}
+
+		_, secret, err := svc.Issue(ctx, "", key)
+		if err != nil {
+			return issueRes{}, err
+		}
+
+		return issueRes{secret}, nil
+	}
+}
+
+func identifyEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(identityReq)
+		if err := req.validate(); err != nil {
+			return identityRes{}, err
+		}
+
+		id, err := svc.Identify(ctx, req.token)
+		if err != nil {
+			return identityRes{}, err
+		}
+
+		ret := identityRes{
+			id:    id.ID,
+			email: id.Email,
+		}
+		return ret, nil
+	}
+}
+
+func authorizeEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(authReq)
+
+		if err := req.validate(); err != nil {
+			return authorizeRes{}, err
+		}
+
+		err := svc.Authorize(ctx, auth.PolicyReq{Subject: req.Sub, Object: req.Obj, Relation: req.Act})
+		if err != nil {
+			return authorizeRes{}, err
+		}
+		return authorizeRes{authorized: true}, err
+	}
+}
+
+func addPolicyEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(policyReq)
+		if err := req.validate(); err != nil {
+			return addPolicyRes{}, err
+		}
+
+		err := svc.AddPolicy(ctx, auth.PolicyReq{Subject: req.Sub, Object: req.Obj, Relation: req.Act})
+		if err != nil {
+			return addPolicyRes{}, err
+		}
+		return addPolicyRes{authorized: true}, err
+	}
+}
+
+func deletePolicyEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(policyReq)
+		if err := req.validate(); err != nil {
+			return deletePolicyRes{}, err
+		}
+
+		err := svc.DeletePolicy(ctx, auth.PolicyReq{Subject: req.Sub, Object: req.Obj, Relation: req.Act})
+		if err != nil {
+			return deletePolicyRes{}, err
+		}
+		return deletePolicyRes{deleted: true}, nil
+	}
+}
+
+func listPoliciesEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listPoliciesReq)
+
+		page, err := svc.ListPolicies(ctx, auth.PolicyReq{Subject: req.Sub, Object: req.Obj, Relation: req.Act})
+		if err != nil {
+			return deletePolicyRes{}, err
+		}
+		return listPoliciesRes{policies: page.Policies}, nil
+	}
+}
+
+func assignEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(assignReq)
+
+		if err := req.validate(); err != nil {
+			return emptyRes{}, err
+		}
+
+		_, err := svc.Identify(ctx, req.token)
+		if err != nil {
+			return emptyRes{}, err
+		}
+
+		err = svc.Assign(ctx, req.token, req.memberID, req.groupID, req.groupType)
+		if err != nil {
+			return emptyRes{}, err
+		}
+		return emptyRes{}, nil
+
+	}
+}
+
+func membersEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(membersReq)
+		if err := req.validate(); err != nil {
+			return membersRes{}, err
+		}
+
+		pm := auth.PageMetadata{
+			Offset: req.offset,
+			Limit:  req.limit,
+		}
+		mp, err := svc.ListMembers(ctx, req.token, req.groupID, req.memberType, pm)
+		if err != nil {
+			return membersRes{}, err
+		}
+		var members []string
+		for _, m := range mp.Members {
+			members = append(members, m.ID)
+		}
+		return membersRes{
+			offset:  req.offset,
+			limit:   req.limit,
+			total:   mp.PageMetadata.Total,
+			members: members,
+		}, nil
+	}
+}
@@ -0,0 +1,463 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc_test
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	grpcapi "github.com/mainflux/mainflux/auth/api/grpc"
+	"github.com/mainflux/mainflux/auth/jwt"
+	"github.com/mainflux/mainflux/auth/mocks"
+	"github.com/mainflux/mainflux/pkg/uuid"
+	"github.com/opentracing/opentracing-go/mocktracer"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+const (
+	port        = 8081
+	secret      = "secret"
+	email       = "test@example.com"
+	id          = "testID"
+	thingsType  = "things"
+	usersType   = "users"
+	description = "Description"
+
+	numOfThings = 5
+	numOfUsers  = 5
+
+	authoritiesObj = "authorities"
+	memberRelation = "member"
+	loginDuration  = 30 * time.Minute
+)
+
+var svc auth.Service
+
+func newService() auth.Service {
+	repo := mocks.NewKeyRepository()
+	groupRepo := mocks.NewGroupRepository()
+	idProvider := uuid.NewMock()
+
+	mockAuthzDB := map[string][]mocks.MockSubjectSet{}
+	mockAuthzDB[id] = append(mockAuthzDB[id], mocks.MockSubjectSet{Object: authoritiesObj, Relation: memberRelation})
+	ketoMock := mocks.NewKetoMock(mockAuthzDB)
+
+	t := jwt.New(secret)
+
+	return auth.New(repo, groupRepo, idProvider, t, ketoMock, loginDuration)
+}
+
+func startGRPCServer(svc auth.Service, port int) {
+	listener, _ := net.Listen("tcp", fmt.Sprintf(":%d", port))
+	server := grpc.NewServer()
+	mainflux.RegisterAuthServiceServer(server, grpcapi.NewServer(mocktracer.New(), svc))
+	go server.Serve(listener)
+}
+
+func TestIssue(t *testing.T) {
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	cases := []struct {
+		desc  string
+		id    string
+		email string
+		kind  uint32
+		err   error
+		code  codes.Code
+	}{
+		{
+			desc:  "issue for user with valid token",
+			id:    id,
+			email: email,
+			kind:  auth.LoginKey,
+			err:   nil,
+			code:  codes.OK,
+		},
+		{
+			desc:  "issue recovery key",
+			id:    id,
+			email: email,
+			kind:  auth.RecoveryKey,
+			err:   nil,
+			code:  codes.OK,
+		},
+		{
+			desc:  "issue API key unauthenticated",
+			id:    id,
+			email: email,
+			kind:  auth.APIKey,
+			err:   nil,
+			code:  codes.Unauthenticated,
+		},
+		{
+			desc:  "issue for invalid key type",
+			id:    id,
+			email: email,
+			kind:  32,
+			err:   status.Error(codes.InvalidArgument, "received invalid token request"),
+			code:  codes.InvalidArgument,
+		},
+		{
+			desc:  "issue for user that exist",
+			id:    "",
+			email: "",
+			kind:  auth.APIKey,
+			err:   status.Error(codes.Unauthenticated, "unauthenticated access"),
+			code:  codes.Unauthenticated,
+		},
+	}
+
+	for _, tc := range cases {
+		_, err := client.Issue(context.Background(), &mainflux.IssueReq{Id: tc.id, Email: tc.email, Type: tc.kind})
+		e, ok := status.FromError(err)
+		assert.True(t, ok, "gRPC status can't be extracted from the error")
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+	}
+}
+
+func TestIdentify(t *testing.T) {
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	_, recoverySecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.RecoveryKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing recovery key expected to succeed: %s", err))
+
+	_, apiSecret, err := svc.Issue(context.Background(), loginSecret, auth.Key{Type: auth.APIKey, IssuedAt: time.Now(), ExpiresAt: time.Now().Add(time.Minute), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing API key expected to succeed: %s", err))
+
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	cases := []struct {
+		desc  string
+		token string
+		idt   mainflux.UserIdentity
+		err   error
+		code  codes.Code
+	}{
+		{
+			desc:  "identify user with user token",
+			token: loginSecret,
+			idt:   mainflux.UserIdentity{Email: email, Id: id},
+			err:   nil,
+			code:  codes.OK,
+		},
+		{
+			desc:  "identify user with recovery token",
+			token: recoverySecret,
+			idt:   mainflux.UserIdentity{Email: email, Id: id},
+			err:   nil,
+			code:  codes.OK,
+		},
+		{
+			desc:  "identify user with API token",
+			token: apiSecret,
+			idt:   mainflux.UserIdentity{Email: email, Id: id},
+			err:   nil,
+			code:  codes.OK,
+		},
+		{
+			desc:  "identify user with invalid user token",
+			token: "invalid",
+			idt:   mainflux.UserIdentity{},
+			err:   status.Error(codes.Unauthenticated, "unauthenticated access"),
+			code:  codes.Unauthenticated,
+		},
+		{
+			desc:  "identify user with empty token",
+			token: "",
+			idt:   mainflux.UserIdentity{},
+			err:   status.Error(codes.InvalidArgument, "received invalid token request"),
+			code:  codes.Unauthenticated,
+		},
+	}
+
+	for _, tc := range cases {
+		idt, err := client.Identify(context.Background(), &mainflux.Token{Value: tc.token})
+		if idt != nil {
+			assert.Equal(t, tc.idt, *idt, fmt.Sprintf("%s: expected %v got %v", tc.desc, tc.idt, *idt))
+		}
+		e, ok := status.FromError(err)
+		assert.True(t, ok, "gRPC status can't be extracted from the error")
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+	}
+}
+
+func TestAuthorize(t *testing.T) {
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	cases := []struct {
+		desc     string
+		token    string
+		subject  string
+		object   string
+		relation string
+		ar       mainflux.AuthorizeRes
+		err      error
+		code     codes.Code
+	}{
+		{
+			desc:     "authorize user with authorized token",
+			token:    loginSecret,
+			subject:  id,
+			object:   authoritiesObj,
+			relation: memberRelation,
+			ar:       mainflux.AuthorizeRes{Authorized: true},
+			err:      nil,
+			code:     codes.OK,
+		},
+		{
+			desc:     "authorize user with unauthorized relation",
+			token:    loginSecret,
+			subject:  id,
+			object:   authoritiesObj,
+			relation: "unauthorizedRelation",
+			ar:       mainflux.AuthorizeRes{Authorized: false},
+			err:      nil,
+			code:     codes.PermissionDenied,
+		},
+		{
+			desc:     "authorize user with unauthorized object",
+			token:    loginSecret,
+			subject:  id,
+			object:   "unauthorizedobject",
+			relation: memberRelation,
+			ar:       mainflux.AuthorizeRes{Authorized: false},
+			err:      nil,
+			code:     codes.PermissionDenied,
+		},
+		{
+			desc:     "authorize user with unauthorized subject",
+			token:    loginSecret,
+			subject:  "unauthorizedSubject",
+			object:   authoritiesObj,
+			relation: memberRelation,
+			ar:       mainflux.AuthorizeRes{Authorized: false},
+			err:      nil,
+			code:     codes.PermissionDenied,
+		},
+		{
+			desc:     "authorize user with invalid ACL",
+			token:    loginSecret,
+			subject:  "",
+			object:   "",
+			relation: "",
+			ar:       mainflux.AuthorizeRes{Authorized: false},
+			err:      nil,
+			code:     codes.InvalidArgument,
+		},
+	}
+	for _, tc := range cases {
+		ar, err := client.Authorize(context.Background(), &mainflux.AuthorizeReq{Sub: tc.subject, Obj: tc.object, Act: tc.relation})
+		if ar != nil {
+			assert.Equal(t, tc.ar, *ar, fmt.Sprintf("%s: expected %v got %v", tc.desc, tc.ar, *ar))
+		}
+
+		e, ok := status.FromError(err)
+		assert.True(t, ok, "gRPC status can't be extracted from the error")
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+	}
+}
+
+func TestAddPolicy(t *testing.T) {
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	groupAdminObj := "groupadmin"
+
+	cases := []struct {
+		desc     string
+		token    string
+		subject  string
+		object   string
+		relation string
+		ar       mainflux.AddPolicyRes
+		err      error
+		code     codes.Code
+	}{
+		{
+			desc:     "add groupadmin policy to user",
+			token:    loginSecret,
+			subject:  id,
+			object:   groupAdminObj,
+			relation: memberRelation,
+			ar:       mainflux.AddPolicyRes{Authorized: true},
+			err:      nil,
+			code:     codes.OK,
+		},
+		{
+			desc:     "add policy to user with invalid ACL",
+			token:    loginSecret,
+			subject:  "",
+			object:   "",
+			relation: "",
+			ar:       mainflux.AddPolicyRes{Authorized: false},
+			err:      nil,
+			code:     codes.InvalidArgument,
+		},
+	}
+	for _, tc := range cases {
+		apr, err := client.AddPolicy(context.Background(), &mainflux.AddPolicyReq{Sub: tc.subject, Obj: tc.object, Act: tc.relation})
+		if apr != nil {
+			assert.Equal(t, tc.ar, *apr, fmt.Sprintf("%s: expected %v got %v", tc.desc, tc.ar, *apr))
+		}
+
+		e, ok := status.FromError(err)
+		assert.True(t, ok, "gRPC status can't be extracted from the error")
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+	}
+}
+
+func TestDeletePolicy(t *testing.T) {
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	readRelation := "read"
+	thingID := "thing"
+
+	apr, err := client.AddPolicy(context.Background(), &mainflux.AddPolicyReq{Sub: id, Obj: thingID, Act: readRelation})
+	assert.Nil(t, err, fmt.Sprintf("Adding read policy to user expected to succeed: %s", err))
+	assert.True(t, apr.GetAuthorized(), fmt.Sprintf("Adding read policy expected to make user authorized, expected %v got %v", true, apr.GetAuthorized()))
+
+	cases := []struct {
+		desc     string
+		token    string
+		subject  string
+		object   string
+		relation string
+		dpr      *mainflux.DeletePolicyRes
+		code     codes.Code
+	}{
+		{
+			desc:     "delete valid policy",
+			token:    loginSecret,
+			subject:  id,
+			object:   thingID,
+			relation: readRelation,
+			dpr:      &mainflux.DeletePolicyRes{Deleted: true},
+			code:     codes.OK,
+		},
+		{
+			desc:     "delete invalid policy",
+			token:    loginSecret,
+			subject:  "",
+			object:   "",
+			relation: "",
+			dpr:      &mainflux.DeletePolicyRes{Deleted: false},
+			code:     codes.InvalidArgument,
+		},
+	}
+	for _, tc := range cases {
+		dpr, err := client.DeletePolicy(context.Background(), &mainflux.DeletePolicyReq{Sub: tc.subject, Obj: tc.object, Act: tc.relation})
+		e, ok := status.FromError(err)
+		assert.True(t, ok, "gRPC status can't be extracted from the error")
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+		assert.Equal(t, tc.dpr.GetDeleted(), dpr.GetDeleted(), fmt.Sprintf("%s: expected %v got %v", tc.desc, tc.dpr.GetDeleted(), dpr.GetDeleted()))
+	}
+}
+
+func TestMembers(t *testing.T) {
+	_, token, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	group := auth.Group{
+		Name:        "Mainflux",
+		Description: description,
+	}
+
+	var things []string
+	for i := 0; i < numOfThings; i++ {
+		thID, err := uuid.New().ID()
+		assert.Nil(t, err, fmt.Sprintf("Generate thing id expected to succeed: %s", err))
+
+		err = svc.AddPolicy(context.Background(), auth.PolicyReq{Subject: id, Object: thID, Relation: "owner"})
+		assert.Nil(t, err, fmt.Sprintf("Adding a policy expected to succeed: %s", err))
+
+		things = append(things, thID)
+	}
+
+	var users []string
+	for i := 0; i < numOfUsers; i++ {
+		id, err := uuid.New().ID()
+		assert.Nil(t, err, fmt.Sprintf("Generate thing id expected to succeed: %s", err))
+
+		users = append(users, id)
+	}
+
+	group, err = svc.CreateGroup(context.Background(), token, group)
+	assert.Nil(t, err, fmt.Sprintf("Creating group expected to succeed: %s", err))
+	err = svc.AddPolicy(context.Background(), auth.PolicyReq{Subject: id, Object: group.ID, Relation: "groupadmin"})
+	assert.Nil(t, err, fmt.Sprintf("Adding a policy expected to succeed: %s", err))
+
+	err = svc.Assign(context.Background(), token, group.ID, thingsType, things...)
+	assert.Nil(t, err, fmt.Sprintf("Assign members to  expected to succeed: %s", err))
+
+	err = svc.Assign(context.Background(), token, group.ID, usersType, users...)
+	assert.Nil(t, err, fmt.Sprintf("Assign members to group expected to succeed: %s", err))
+
+	cases := []struct {
+		desc      string
+		token     string
+		groupID   string
+		groupType string
+		size      int
+		err       error
+		code      codes.Code
+	}{
+		{
+			desc:      "get all things with user token",
+			groupID:   group.ID,
+			token:     token,
+			groupType: thingsType,
+			size:      numOfThings,
+			err:       nil,
+			code:      codes.OK,
+		},
+		{
+			desc:      "get all users with user token",
+			groupID:   group.ID,
+			token:     token,
+			groupType: usersType,
+			size:      numOfUsers,
+			err:       nil,
+			code:      codes.OK,
+		},
+	}
+
+	authAddr := fmt.Sprintf("localhost:%d", port)
+	conn, _ := grpc.Dial(authAddr, grpc.WithInsecure())
+	client := grpcapi.NewClient(mocktracer.New(), conn, time.Second)
+
+	for _, tc := range cases {
+		m, err := client.Members(context.Background(), &mainflux.MembersReq{Token: tc.token, GroupID: tc.groupID, Type: tc.groupType, Offset: 0, Limit: 10})
+		e, ok := status.FromError(err)
+		assert.Equal(t, tc.size, len(m.Members), fmt.Sprintf("%s: expected %d got %d", tc.desc, tc.size, len(m.Members)))
+		assert.Equal(t, tc.code, e.Code(), fmt.Sprintf("%s: expected %s got %s", tc.desc, tc.code, e.Code()))
+		assert.True(t, ok, "OK expected to be true")
+	}
+}
@@ -0,0 +1,138 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc
+
+import (
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+)
+
+type identityReq struct {
+	token string
+	kind  uint32
+}
+
+func (req identityReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+	if req.kind != auth.LoginKey &&
+		req.kind != auth.APIKey &&
+		req.kind != auth.RecoveryKey {
+		return apiutil.ErrInvalidAuthKey
+	}
+
+	return nil
+}
+
+type issueReq struct {
+	id      string
+	email   string
+	keyType uint32
+}
+
+func (req issueReq) validate() error {
+	if req.email == "" {
+		return apiutil.ErrMissingEmail
+	}
+	if req.keyType != auth.LoginKey &&
+		req.keyType != auth.APIKey &&
+		req.keyType != auth.RecoveryKey {
+		return apiutil.ErrInvalidAuthKey
+	}
+
+	return nil
+}
+
+type assignReq struct {
+	token     string
+	groupID   string
+	memberID  string
+	groupType string
+}
+
+func (req assignReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+	if req.groupID == "" || req.memberID == "" {
+		return apiutil.ErrMissingID
+	}
+	return nil
+}
+
+type membersReq struct {
+	token      string
+	groupID    string
+	offset     uint64
+	limit      uint64
+	memberType string
+}
+
+func (req membersReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+	if req.groupID == "" {
+		return apiutil.ErrMissingID
+	}
+	if req.memberType == "" {
+		return apiutil.ErrMissingMemberType
+	}
+	return nil
+}
+
+// authReq represents authorization request. It contains:
+// 1. subject - an action invoker
+// 2. object - an entity over which action will be executed
+// 3. action - type of action that will be executed (read/write)
+type authReq struct {
+	Sub string
+	Obj string
+	Act string
+}
+
+func (req authReq) validate() error {
+	if req.Sub == "" {
+		return apiutil.ErrMissingPolicySub
+	}
+
+	if req.Obj == "" {
+		return apiutil.ErrMissingPolicyObj
+	}
+
+	if req.Act == "" {
+		return apiutil.ErrMissingPolicyAct
+	}
+
+	return nil
+}
+
+type policyReq struct {
+	Sub string
+	Obj string
+	Act string
+}
+
+func (req policyReq) validate() error {
+	if req.Sub == "" {
+		return apiutil.ErrMissingPolicySub
+	}
+
+	if req.Obj == "" {
+		return apiutil.ErrMissingPolicyObj
+	}
+
+	if req.Act == "" {
+		return apiutil.ErrMissingPolicyAct
+	}
+
+	return nil
+}
+
+type listPoliciesReq struct {
+	Sub string
+	Obj string
+	Act string
+}
@@ -0,0 +1,40 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc
+
+type identityRes struct {
+	id    string
+	email string
+}
+
+type issueRes struct {
+	value string
+}
+
+type authorizeRes struct {
+	authorized bool
+}
+
+type addPolicyRes struct {
+	authorized bool
+}
+
+type deletePolicyRes struct {
+	deleted bool
+}
+
+type listPoliciesRes struct {
+	policies []string
+}
+
+type membersRes struct {
+	total     uint64
+	offset    uint64
+	limit     uint64
+	groupType string
+	members   []string
+}
+type emptyRes struct {
+	err error
+}
@@ -0,0 +1,258 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc
+
+import (
+	"context"
+
+	kitot "github.com/go-kit/kit/tracing/opentracing"
+	kitgrpc "github.com/go-kit/kit/transport/grpc"
+	"github.com/golang/protobuf/ptypes/empty"
+	mainflux "github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/pkg/errors"
+	opentracing "github.com/opentracing/opentracing-go"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+var _ mainflux.AuthServiceServer = (*grpcServer)(nil)
+
+type grpcServer struct {
+	issue        kitgrpc.Handler
+	identify     kitgrpc.Handler
+	authorize    kitgrpc.Handler
+	addPolicy    kitgrpc.Handler
+	deletePolicy kitgrpc.Handler
+	listPolicies kitgrpc.Handler
+	assign       kitgrpc.Handler
+	members      kitgrpc.Handler
+}
+
+// NewServer returns new AuthServiceServer instance.
+func NewServer(tracer opentracing.Tracer, svc auth.Service) mainflux.AuthServiceServer {
+	return &grpcServer{
+		issue: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "issue")(issueEndpoint(svc)),
+			decodeIssueRequest,
+			encodeIssueResponse,
+		),
+		identify: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "identify")(identifyEndpoint(svc)),
+			decodeIdentifyRequest,
+			encodeIdentifyResponse,
+		),
+		authorize: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "authorize")(authorizeEndpoint(svc)),
+			decodeAuthorizeRequest,
+			encodeAuthorizeResponse,
+		),
+		addPolicy: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "add_policy")(addPolicyEndpoint(svc)),
+			decodeAddPolicyRequest,
+			encodeAddPolicyResponse,
+		),
+		deletePolicy: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "delete_policy")(deletePolicyEndpoint(svc)),
+			decodeDeletePolicyRequest,
+			encodeDeletePolicyResponse,
+		),
+		listPolicies: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "list_policies")(listPoliciesEndpoint(svc)),
+			decodeListPoliciesRequest,
+			encodeListPoliciesResponse,
+		),
+		assign: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "assign")(assignEndpoint(svc)),
+			decodeAssignRequest,
+			encodeEmptyResponse,
+		),
+		members: kitgrpc.NewServer(
+			kitot.TraceServer(tracer, "members")(membersEndpoint(svc)),
+			decodeMembersRequest,
+			encodeMembersResponse,
+		),
+	}
+}
+
+func (s *grpcServer) Issue(ctx context.Context, req *mainflux.IssueReq) (*mainflux.Token, error) {
+	_, res, err := s.issue.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.Token), nil
+}
+
+func (s *grpcServer) Identify(ctx context.Context, token *mainflux.Token) (*mainflux.UserIdentity, error) {
+	_, res, err := s.identify.ServeGRPC(ctx, token)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.UserIdentity), nil
+}
+
+func (s *grpcServer) Authorize(ctx context.Context, req *mainflux.AuthorizeReq) (*mainflux.AuthorizeRes, error) {
+	_, res, err := s.authorize.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.AuthorizeRes), nil
+}
+
+func (s *grpcServer) AddPolicy(ctx context.Context, req *mainflux.AddPolicyReq) (*mainflux.AddPolicyRes, error) {
+	_, res, err := s.addPolicy.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.AddPolicyRes), nil
+}
+
+func (s *grpcServer) DeletePolicy(ctx context.Context, req *mainflux.DeletePolicyReq) (*mainflux.DeletePolicyRes, error) {
+	_, res, err := s.deletePolicy.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.DeletePolicyRes), nil
+}
+
+func (s *grpcServer) ListPolicies(ctx context.Context, req *mainflux.ListPoliciesReq) (*mainflux.ListPoliciesRes, error) {
+	_, res, err := s.listPolicies.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.ListPoliciesRes), nil
+}
+
+func (s *grpcServer) Assign(ctx context.Context, token *mainflux.Assignment) (*empty.Empty, error) {
+	_, res, err := s.assign.ServeGRPC(ctx, token)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*empty.Empty), nil
+}
+
+func (s *grpcServer) Members(ctx context.Context, req *mainflux.MembersReq) (*mainflux.MembersRes, error) {
+	_, res, err := s.members.ServeGRPC(ctx, req)
+	if err != nil {
+		return nil, encodeError(err)
+	}
+	return res.(*mainflux.MembersRes), nil
+}
+
+func decodeIssueRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.IssueReq)
+	return issueReq{id: req.GetId(), email: req.GetEmail(), keyType: req.GetType()}, nil
+}
+
+func encodeIssueResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(issueRes)
+	return &mainflux.Token{Value: res.value}, nil
+}
+
+func decodeIdentifyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.Token)
+	return identityReq{token: req.GetValue()}, nil
+}
+
+func encodeIdentifyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(identityRes)
+	return &mainflux.UserIdentity{Id: res.id, Email: res.email}, nil
+}
+
+func decodeAuthorizeRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.AuthorizeReq)
+	return authReq{Act: req.GetAct(), Obj: req.GetObj(), Sub: req.GetSub()}, nil
+}
+
+func encodeAuthorizeResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(authorizeRes)
+	return &mainflux.AuthorizeRes{Authorized: res.authorized}, nil
+}
+
+func decodeAddPolicyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.AddPolicyReq)
+	return policyReq{Sub: req.GetSub(), Obj: req.GetObj(), Act: req.GetAct()}, nil
+}
+
+func encodeAddPolicyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(addPolicyRes)
+	return &mainflux.AddPolicyRes{Authorized: res.authorized}, nil
+}
+
+func decodeAssignRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.Token)
+	return assignReq{token: req.GetValue()}, nil
+}
+
+func decodeDeletePolicyRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.DeletePolicyReq)
+	return policyReq{Sub: req.GetSub(), Obj: req.GetObj(), Act: req.GetAct()}, nil
+}
+
+func encodeDeletePolicyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(deletePolicyRes)
+	return &mainflux.DeletePolicyRes{Deleted: res.deleted}, nil
+}
+
+func decodeListPoliciesRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.ListPoliciesReq)
+	return listPoliciesReq{Sub: req.GetSub(), Obj: req.GetObj(), Act: req.GetAct()}, nil
+}
+
+func encodeListPoliciesResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(listPoliciesRes)
+	return &mainflux.ListPoliciesRes{Policies: res.policies}, nil
+}
+
+func decodeMembersRequest(_ context.Context, grpcReq interface{}) (interface{}, error) {
+	req := grpcReq.(*mainflux.MembersReq)
+	return membersReq{
+		token:      req.GetToken(),
+		groupID:    req.GetGroupID(),
+		memberType: req.GetType(),
+		offset:     req.Offset,
+		limit:      req.Limit,
+	}, nil
+}
+
+func encodeMembersResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(membersRes)
+	return &mainflux.MembersRes{
+		Total:   res.total,
+		Offset:  res.offset,
+		Limit:   res.limit,
+		Type:    res.groupType,
+		Members: res.members,
+	}, nil
+}
+
+func encodeEmptyResponse(_ context.Context, grpcRes interface{}) (interface{}, error) {
+	res := grpcRes.(emptyRes)
+	return &empty.Empty{}, encodeError(res.err)
+}
+
+func encodeError(err error) error {
+	switch {
+	case errors.Contains(err, nil):
+		return nil
+	case errors.Contains(err, errors.ErrMalformedEntity),
+		err == apiutil.ErrInvalidAuthKey,
+		err == apiutil.ErrMissingID,
+		err == apiutil.ErrMissingMemberType,
+		err == apiutil.ErrMissingPolicySub,
+		err == apiutil.ErrMissingPolicyObj,
+		err == apiutil.ErrMissingPolicyAct:
+		return status.Error(codes.InvalidArgument, err.Error())
+	case errors.Contains(err, errors.ErrAuthentication),
+		errors.Contains(err, auth.ErrKeyExpired),
+		err == apiutil.ErrMissingEmail,
+		err == apiutil.ErrBearerToken:
+		return status.Error(codes.Unauthenticated, err.Error())
+	case errors.Contains(err, errors.ErrAuthorization):
+		return status.Error(codes.PermissionDenied, err.Error())
+	default:
+		return status.Error(codes.Internal, "internal server error")
+	}
+}
@@ -0,0 +1,18 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package grpc_test
+
+import (
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	svc = newService()
+	startGRPCServer(svc, port)
+
+	code := m.Run()
+
+	os.Exit(code)
+}
@@ -0,0 +1,3 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+package http
@@ -0,0 +1,370 @@
+package groups
+
+import (
+	"context"
+
+	"github.com/go-kit/kit/endpoint"
+	"github.com/mainflux/mainflux/auth"
+)
+
+func createGroupEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(createGroupReq)
+		if err := req.validate(); err != nil {
+			return groupRes{}, err
+		}
+
+		group := auth.Group{
+			Name:        req.Name,
+			Description: req.Description,
+			ParentID:    req.ParentID,
+			Metadata:    req.Metadata,
+		}
+
+		group, err := svc.CreateGroup(ctx, req.token, group)
+		if err != nil {
+			return groupRes{}, err
+		}
+
+		return groupRes{created: true, id: group.ID}, nil
+	}
+}
+
+func viewGroupEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(groupReq)
+		if err := req.validate(); err != nil {
+			return viewGroupRes{}, err
+		}
+
+		group, err := svc.ViewGroup(ctx, req.token, req.id)
+		if err != nil {
+			return viewGroupRes{}, err
+		}
+
+		res := viewGroupRes{
+			ID:          group.ID,
+			Name:        group.Name,
+			Description: group.Description,
+			Metadata:    group.Metadata,
+			ParentID:    group.ParentID,
+			OwnerID:     group.OwnerID,
+			CreatedAt:   group.CreatedAt,
+			UpdatedAt:   group.UpdatedAt,
+		}
+
+		return res, nil
+	}
+}
+
+func updateGroupEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(updateGroupReq)
+		if err := req.validate(); err != nil {
+			return groupRes{}, err
+		}
+
+		group := auth.Group{
+			ID:          req.id,
+			Name:        req.Name,
+			Description: req.Description,
+			Metadata:    req.Metadata,
+		}
+
+		_, err := svc.UpdateGroup(ctx, req.token, group)
+		if err != nil {
+			return groupRes{}, err
+		}
+
+		res := groupRes{created: false}
+		return res, nil
+	}
+}
+
+func deleteGroupEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(groupReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.RemoveGroup(ctx, req.token, req.id); err != nil {
+			return nil, err
+		}
+
+		return deleteRes{}, nil
+	}
+}
+
+func listGroupsEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listGroupsReq)
+		if err := req.validate(); err != nil {
+			return groupPageRes{}, err
+		}
+		pm := auth.PageMetadata{
+			Level:    req.level,
+			Metadata: req.metadata,
+		}
+		page, err := svc.ListGroups(ctx, req.token, pm)
+		if err != nil {
+			return groupPageRes{}, err
+		}
+
+		if req.tree {
+			return buildGroupsResponseTree(page), nil
+		}
+
+		return buildGroupsResponse(page), nil
+	}
+}
+
+func listMemberships(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listMembershipsReq)
+		if err := req.validate(); err != nil {
+			return memberPageRes{}, err
+		}
+
+		pm := auth.PageMetadata{
+			Offset:   req.offset,
+			Limit:    req.limit,
+			Metadata: req.metadata,
+		}
+
+		page, err := svc.ListMemberships(ctx, req.token, req.id, pm)
+		if err != nil {
+			return memberPageRes{}, err
+		}
+
+		return buildGroupsResponse(page), nil
+	}
+}
+
+func shareGroupAccessEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(shareGroupAccessReq)
+		if err := req.validate(); err != nil {
+			return shareGroupRes{}, err
+		}
+
+		if err := svc.AssignGroupAccessRights(ctx, req.token, req.ThingGroupID, req.userGroupID); err != nil {
+			return shareGroupRes{}, err
+		}
+		return shareGroupRes{}, nil
+	}
+}
+
+func listChildrenEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listGroupsReq)
+		if err := req.validate(); err != nil {
+			return groupPageRes{}, err
+		}
+
+		pm := auth.PageMetadata{
+			Level:    req.level,
+			Metadata: req.metadata,
+		}
+		page, err := svc.ListChildren(ctx, req.token, req.id, pm)
+		if err != nil {
+			return groupPageRes{}, err
+		}
+
+		if req.tree {
+			return buildGroupsResponseTree(page), nil
+		}
+
+		return buildGroupsResponse(page), nil
+	}
+}
+
+func listParentsEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listGroupsReq)
+		if err := req.validate(); err != nil {
+			return groupPageRes{}, err
+		}
+		pm := auth.PageMetadata{
+			Level:    req.level,
+			Metadata: req.metadata,
+		}
+
+		page, err := svc.ListParents(ctx, req.token, req.id, pm)
+		if err != nil {
+			return groupPageRes{}, err
+		}
+
+		if req.tree {
+			return buildGroupsResponseTree(page), nil
+		}
+
+		return buildGroupsResponse(page), nil
+	}
+}
+
+func assignEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(assignReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.Assign(ctx, req.token, req.groupID, req.Type, req.Members...); err != nil {
+			return nil, err
+		}
+
+		return assignRes{}, nil
+	}
+}
+
+func unassignEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(unassignReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.Unassign(ctx, req.token, req.groupID, req.Members...); err != nil {
+			return nil, err
+		}
+
+		return unassignRes{}, nil
+	}
+}
+
+func listMembersEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listMembersReq)
+		if err := req.validate(); err != nil {
+			return memberPageRes{}, err
+		}
+
+		pm := auth.PageMetadata{
+			Offset:   req.offset,
+			Limit:    req.limit,
+			Metadata: req.metadata,
+		}
+		page, err := svc.ListMembers(ctx, req.token, req.id, req.groupType, pm)
+		if err != nil {
+			return memberPageRes{}, err
+		}
+
+		return buildUsersResponse(page, req.groupType), nil
+	}
+}
+
+func buildGroupsResponseTree(page auth.GroupPage) groupPageRes {
+	groupsMap := map[string]*auth.Group{}
+	// Parents' map keeps its array of children.
+	parentsMap := map[string][]*auth.Group{}
+	for i := range page.Groups {
+		if _, ok := groupsMap[page.Groups[i].ID]; !ok {
+			groupsMap[page.Groups[i].ID] = &page.Groups[i]
+			parentsMap[page.Groups[i].ID] = make([]*auth.Group, 0)
+		}
+	}
+
+	for _, group := range groupsMap {
+		if children, ok := parentsMap[group.ParentID]; ok {
+			children = append(children, group)
+			parentsMap[group.ParentID] = children
+		}
+	}
+
+	res := groupPageRes{
+		pageRes: pageRes{
+			Limit:  page.Limit,
+			Offset: page.Offset,
+			Total:  page.Total,
+			Level:  page.Level,
+		},
+		Groups: []viewGroupRes{},
+	}
+
+	for _, group := range groupsMap {
+		if children, ok := parentsMap[group.ID]; ok {
+			group.Children = children
+		}
+
+	}
+
+	for _, group := range groupsMap {
+		view := toViewGroupRes(*group)
+		if children, ok := parentsMap[group.ParentID]; len(children) == 0 || !ok {
+			res.Groups = append(res.Groups, view)
+		}
+	}
+
+	return res
+}
+
+func toViewGroupRes(group auth.Group) viewGroupRes {
+	view := viewGroupRes{
+		ID:          group.ID,
+		ParentID:    group.ParentID,
+		OwnerID:     group.OwnerID,
+		Name:        group.Name,
+		Description: group.Description,
+		Metadata:    group.Metadata,
+		Level:       group.Level,
+		Path:        group.Path,
+		Children:    make([]*viewGroupRes, 0),
+		CreatedAt:   group.CreatedAt,
+		UpdatedAt:   group.UpdatedAt,
+	}
+
+	for _, ch := range group.Children {
+		child := toViewGroupRes(*ch)
+		view.Children = append(view.Children, &child)
+	}
+
+	return view
+}
+
+func buildGroupsResponse(gp auth.GroupPage) groupPageRes {
+	res := groupPageRes{
+		pageRes: pageRes{
+			Total: gp.Total,
+			Level: gp.Level,
+		},
+		Groups: []viewGroupRes{},
+	}
+
+	for _, group := range gp.Groups {
+		view := viewGroupRes{
+			ID:          group.ID,
+			ParentID:    group.ParentID,
+			OwnerID:     group.OwnerID,
+			Name:        group.Name,
+			Description: group.Description,
+			Metadata:    group.Metadata,
+			Level:       group.Level,
+			Path:        group.Path,
+			CreatedAt:   group.CreatedAt,
+			UpdatedAt:   group.UpdatedAt,
+		}
+		res.Groups = append(res.Groups, view)
+	}
+
+	return res
+}
+
+func buildUsersResponse(mp auth.MemberPage, groupType string) memberPageRes {
+	res := memberPageRes{
+		pageRes: pageRes{
+			Total:  mp.Total,
+			Offset: mp.Offset,
+			Limit:  mp.Limit,
+			Name:   mp.Name,
+		},
+		Type:    groupType,
+		Members: []string{},
+	}
+
+	for _, m := range mp.Members {
+		res.Members = append(res.Members, m.ID)
+	}
+
+	return res
+}
@@ -0,0 +1,177 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package groups_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	httpapi "github.com/mainflux/mainflux/auth/api/http"
+	"github.com/mainflux/mainflux/auth/jwt"
+	"github.com/mainflux/mainflux/auth/mocks"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/uuid"
+	"github.com/opentracing/opentracing-go/mocktracer"
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	contentType   = "application/json"
+	email         = "user@example.com"
+	secret        = "secret"
+	id            = "testID"
+	loginDuration = 30 * time.Minute
+)
+
+type testRequest struct {
+	client      *http.Client
+	method      string
+	url         string
+	contentType string
+	token       string
+	body        io.Reader
+}
+
+func (tr testRequest) make() (*http.Response, error) {
+	req, err := http.NewRequest(tr.method, tr.url, tr.body)
+	if err != nil {
+		return nil, err
+	}
+	if tr.token != "" {
+		req.Header.Set("Authorization", apiutil.BearerPrefix+tr.token)
+	}
+	if tr.contentType != "" {
+		req.Header.Set("Content-Type", tr.contentType)
+	}
+	return tr.client.Do(req)
+}
+
+func newService() auth.Service {
+	keys := mocks.NewKeyRepository()
+	groups := mocks.NewGroupRepository()
+	idProvider := uuid.NewMock()
+	t := jwt.New(secret)
+	policies := mocks.NewKetoMock(map[string][]mocks.MockSubjectSet{})
+	return auth.New(keys, groups, idProvider, t, policies, loginDuration)
+}
+
+func newServer(svc auth.Service) *httptest.Server {
+	logger := logger.NewMock()
+	mux := httpapi.MakeHandler(svc, mocktracer.New(), logger)
+	return httptest.NewServer(mux)
+}
+
+func toJSON(data interface{}) string {
+	jsonData, _ := json.Marshal(data)
+	return string(jsonData)
+}
+
+func TestShareGroupAccess(t *testing.T) {
+	svc := newService()
+	ts := newServer(svc)
+	defer ts.Close()
+
+	_, secret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+
+	key := auth.Key{
+		ID:       "id",
+		Type:     auth.APIKey,
+		IssuerID: id,
+		Subject:  email,
+		IssuedAt: time.Now(),
+	}
+
+	_, apiToken, err := svc.Issue(context.Background(), secret, key)
+	assert.Nil(t, err, fmt.Sprintf("Issuing user's key expected to succeed: %s", err))
+
+	type shareGroupAccessReq struct {
+		token        string
+		userGroupID  string
+		ThingGroupID string `json:"thing_group_id"`
+	}
+	data := shareGroupAccessReq{token: apiToken, userGroupID: "ug", ThingGroupID: "tg"}
+	invalidData := shareGroupAccessReq{token: apiToken, userGroupID: "ug", ThingGroupID: ""}
+
+	cases := []struct {
+		desc        string
+		req         string
+		contentType string
+		auth        string
+		userGroupID string
+		status      int
+	}{
+		{
+			desc:        "share a user group with thing group",
+			req:         toJSON(data),
+			contentType: contentType,
+			auth:        apiToken,
+			userGroupID: "ug",
+			status:      http.StatusOK,
+		},
+		{
+			desc:        "share a user group with invalid thing group",
+			req:         toJSON(invalidData),
+			contentType: contentType,
+			auth:        apiToken,
+			userGroupID: "ug",
+			status:      http.StatusBadRequest,
+		},
+		{
+			desc:        "share an invalid user group with thing group",
+			req:         toJSON(data),
+			contentType: contentType,
+			auth:        apiToken,
+			userGroupID: "",
+			status:      http.StatusBadRequest,
+		},
+		{
+			desc:        "share an invalid user group with invalid thing group",
+			req:         toJSON(invalidData),
+			contentType: contentType,
+			auth:        apiToken,
+			userGroupID: "",
+			status:      http.StatusBadRequest,
+		},
+		{
+			desc:        "share a user group with thing group with invalid content type",
+			req:         toJSON(data),
+			contentType: "",
+			auth:        apiToken,
+			userGroupID: "ug",
+			status:      http.StatusUnsupportedMediaType,
+		},
+		{
+			desc:        "share a user group with thing group with invalid token",
+			req:         toJSON(data),
+			contentType: contentType,
+			auth:        "token",
+			userGroupID: "ug",
+			status:      http.StatusUnauthorized,
+		},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client:      ts.Client(),
+			method:      http.MethodPost,
+			url:         fmt.Sprintf("%s/groups/%s/share", ts.URL, tc.userGroupID),
+			contentType: tc.contentType,
+			token:       tc.auth,
+			body:        strings.NewReader(tc.req),
+		}
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
@@ -0,0 +1,191 @@
+package groups
+
+import (
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+)
+
+type createGroupReq struct {
+	token       string
+	Name        string                 `json:"name,omitempty"`
+	ParentID    string                 `json:"parent_id,omitempty"`
+	Description string                 `json:"description,omitempty"`
+	Metadata    map[string]interface{} `json:"metadata,omitempty"`
+}
+
+func (req createGroupReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+	if len(req.Name) > maxNameSize || req.Name == "" {
+		return apiutil.ErrNameSize
+	}
+
+	return nil
+}
+
+type updateGroupReq struct {
+	token       string
+	id          string
+	Name        string                 `json:"name,omitempty"`
+	Description string                 `json:"description,omitempty"`
+	Metadata    map[string]interface{} `json:"metadata,omitempty"`
+}
+
+func (req updateGroupReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type listGroupsReq struct {
+	token string
+	id    string
+	level uint64
+	// - `true`  - result is JSON tree representing groups hierarchy,
+	// - `false` - result is JSON array of groups.
+	tree     bool
+	metadata auth.GroupMetadata
+}
+
+func (req listGroupsReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.level > auth.MaxLevel || req.level < auth.MinLevel {
+		return apiutil.ErrMaxLevelExceeded
+	}
+
+	return nil
+}
+
+type listMembersReq struct {
+	token     string
+	id        string
+	groupType string
+	offset    uint64
+	limit     uint64
+	tree      bool
+	metadata  auth.GroupMetadata
+}
+
+func (req listMembersReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type listMembershipsReq struct {
+	token    string
+	id       string
+	offset   uint64
+	limit    uint64
+	metadata auth.GroupMetadata
+}
+
+func (req listMembershipsReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type assignReq struct {
+	token   string
+	groupID string
+	Type    string   `json:"type,omitempty"`
+	Members []string `json:"members"`
+}
+
+func (req assignReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.Type == "" {
+		return apiutil.ErrMissingMemberType
+	}
+
+	if req.groupID == "" {
+		return apiutil.ErrMissingID
+	}
+
+	if len(req.Members) == 0 {
+		return apiutil.ErrEmptyList
+	}
+
+	return nil
+}
+
+type shareGroupAccessReq struct {
+	token        string
+	userGroupID  string
+	ThingGroupID string `json:"thing_group_id"`
+}
+
+func (req shareGroupAccessReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.ThingGroupID == "" || req.userGroupID == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type unassignReq struct {
+	assignReq
+}
+
+func (req unassignReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.groupID == "" {
+		return apiutil.ErrMissingID
+	}
+
+	if len(req.Members) == 0 {
+		return apiutil.ErrEmptyList
+	}
+
+	return nil
+}
+
+type groupReq struct {
+	token string
+	id    string
+}
+
+func (req groupReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
@@ -0,0 +1,174 @@
+package groups
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/mainflux/mainflux"
+)
+
+var (
+	_ mainflux.Response = (*memberPageRes)(nil)
+	_ mainflux.Response = (*groupRes)(nil)
+	_ mainflux.Response = (*deleteRes)(nil)
+	_ mainflux.Response = (*assignRes)(nil)
+	_ mainflux.Response = (*unassignRes)(nil)
+)
+
+type memberPageRes struct {
+	pageRes
+	Type    string   `json:"type"`
+	Members []string `json:"members"`
+}
+
+func (res memberPageRes) Code() int {
+	return http.StatusOK
+}
+
+func (res memberPageRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res memberPageRes) Empty() bool {
+	return false
+}
+
+type shareGroupRes struct {
+}
+
+func (res shareGroupRes) Code() int {
+	return http.StatusOK
+}
+
+func (res shareGroupRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res shareGroupRes) Empty() bool {
+	return false
+}
+
+type viewGroupRes struct {
+	ID          string                 `json:"id"`
+	Name        string                 `json:"name"`
+	OwnerID     string                 `json:"owner_id"`
+	ParentID    string                 `json:"parent_id,omitempty"`
+	Description string                 `json:"description,omitempty"`
+	Metadata    map[string]interface{} `json:"metadata,omitempty"`
+	// Indicates a level in tree hierarchy from first group node - root.
+	Level int `json:"level"`
+	// Path in a tree consisting of group ids
+	// parentID1.parentID2.childID1
+	// e.g. 01EXPM5Z8HRGFAEWTETR1X1441.01EXPKW2TVK74S5NWQ979VJ4PJ.01EXPKW2TVK74S5NWQ979VJ4PJ
+	Path      string          `json:"path"`
+	Children  []*viewGroupRes `json:"children,omitempty"`
+	CreatedAt time.Time       `json:"created_at"`
+	UpdatedAt time.Time       `json:"updated_at"`
+}
+
+func (res viewGroupRes) Code() int {
+	return http.StatusOK
+}
+
+func (res viewGroupRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res viewGroupRes) Empty() bool {
+	return false
+}
+
+type groupRes struct {
+	id      string
+	created bool
+}
+
+func (res groupRes) Code() int {
+	if res.created {
+		return http.StatusCreated
+	}
+
+	return http.StatusOK
+}
+
+func (res groupRes) Headers() map[string]string {
+	if res.created {
+		return map[string]string{
+			"Location": fmt.Sprintf("/groups/%s", res.id),
+		}
+	}
+
+	return map[string]string{}
+}
+
+func (res groupRes) Empty() bool {
+	return true
+}
+
+type groupPageRes struct {
+	pageRes
+	Groups []viewGroupRes `json:"groups"`
+}
+
+type pageRes struct {
+	Limit  uint64 `json:"limit,omitempty"`
+	Offset uint64 `json:"offset,omitempty"`
+	Total  uint64 `json:"total"`
+	Level  uint64 `json:"level"`
+	Name   string `json:"name"`
+}
+
+func (res groupPageRes) Code() int {
+	return http.StatusOK
+}
+
+func (res groupPageRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res groupPageRes) Empty() bool {
+	return false
+}
+
+type deleteRes struct{}
+
+func (res deleteRes) Code() int {
+	return http.StatusNoContent
+}
+
+func (res deleteRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res deleteRes) Empty() bool {
+	return true
+}
+
+type assignRes struct{}
+
+func (res assignRes) Code() int {
+	return http.StatusOK
+}
+
+func (res assignRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res assignRes) Empty() bool {
+	return true
+}
+
+type unassignRes struct{}
+
+func (res unassignRes) Code() int {
+	return http.StatusNoContent
+}
+
+func (res unassignRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res unassignRes) Empty() bool {
+	return true
+}
@@ -0,0 +1,354 @@
+package groups
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	kitot "github.com/go-kit/kit/tracing/opentracing"
+	kithttp "github.com/go-kit/kit/transport/http"
+	"github.com/go-zoo/bone"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/opentracing/opentracing-go"
+)
+
+const (
+	contentType = "application/json"
+	maxNameSize = 254
+	offsetKey   = "offset"
+	limitKey    = "limit"
+	levelKey    = "level"
+	metadataKey = "metadata"
+	treeKey     = "tree"
+	groupType   = "type"
+	defOffset   = 0
+	defLimit    = 10
+	defLevel    = 1
+)
+
+// MakeHandler returns a HTTP handler for API endpoints.
+func MakeHandler(svc auth.Service, mux *bone.Mux, tracer opentracing.Tracer, logger logger.Logger) *bone.Mux {
+	opts := []kithttp.ServerOption{
+		kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
+	}
+	mux.Post("/groups", kithttp.NewServer(
+		kitot.TraceServer(tracer, "create_group")(createGroupEndpoint(svc)),
+		decodeGroupCreate,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/groups/:groupID", kithttp.NewServer(
+		kitot.TraceServer(tracer, "view_group")(viewGroupEndpoint(svc)),
+		decodeGroupRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Put("/groups/:groupID", kithttp.NewServer(
+		kitot.TraceServer(tracer, "update_group")(updateGroupEndpoint(svc)),
+		decodeGroupUpdate,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Delete("/groups/:groupID", kithttp.NewServer(
+		kitot.TraceServer(tracer, "delete_group")(deleteGroupEndpoint(svc)),
+		decodeGroupRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Post("/groups/:subjectGroupID/share", kithttp.NewServer(
+		kitot.TraceServer(tracer, "share_group_access")(shareGroupAccessEndpoint(svc)),
+		decodeShareGroupRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/groups", kithttp.NewServer(
+		kitot.TraceServer(tracer, "list_groups")(listGroupsEndpoint(svc)),
+		decodeListGroupsRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/groups/:groupID/children", kithttp.NewServer(
+		kitot.TraceServer(tracer, "list_children")(listChildrenEndpoint(svc)),
+		decodeListGroupsRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/groups/:groupID/parents", kithttp.NewServer(
+		kitot.TraceServer(tracer, "list_parents_groups")(listParentsEndpoint(svc)),
+		decodeListGroupsRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Post("/groups/:groupID/members", kithttp.NewServer(
+		kitot.TraceServer(tracer, "assign")(assignEndpoint(svc)),
+		decodeAssignRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Delete("/groups/:groupID/members", kithttp.NewServer(
+		kitot.TraceServer(tracer, "unassign")(unassignEndpoint(svc)),
+		decodeUnassignRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/groups/:groupID/members", kithttp.NewServer(
+		kitot.TraceServer(tracer, "list_members")(listMembersEndpoint(svc)),
+		decodeListMembersRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/members/:memberID/groups", kithttp.NewServer(
+		kitot.TraceServer(tracer, "list_memberships")(listMemberships(svc)),
+		decodeListMembershipsRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	return mux
+}
+
+func decodeShareGroupRequest(ctx context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := shareGroupAccessReq{
+		token:       apiutil.ExtractBearerToken(r),
+		userGroupID: bone.GetValue(r, "subjectGroupID"),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeListGroupsRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	l, err := apiutil.ReadUintQuery(r, levelKey, defLevel)
+	if err != nil {
+		return nil, err
+	}
+
+	m, err := apiutil.ReadMetadataQuery(r, metadataKey, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	t, err := apiutil.ReadBoolQuery(r, treeKey, false)
+	if err != nil {
+		return nil, err
+	}
+
+	req := listGroupsReq{
+		token:    apiutil.ExtractBearerToken(r),
+		level:    l,
+		metadata: m,
+		tree:     t,
+		id:       bone.GetValue(r, "groupID"),
+	}
+	return req, nil
+}
+
+func decodeListMembersRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	o, err := apiutil.ReadUintQuery(r, offsetKey, defOffset)
+	if err != nil {
+		return nil, err
+	}
+
+	l, err := apiutil.ReadUintQuery(r, limitKey, defLimit)
+	if err != nil {
+		return nil, err
+	}
+
+	m, err := apiutil.ReadMetadataQuery(r, metadataKey, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	tree, err := apiutil.ReadBoolQuery(r, treeKey, false)
+	if err != nil {
+		return nil, err
+	}
+
+	t, err := apiutil.ReadStringQuery(r, groupType, "")
+	if err != nil {
+		return nil, err
+	}
+
+	req := listMembersReq{
+		token:     apiutil.ExtractBearerToken(r),
+		id:        bone.GetValue(r, "groupID"),
+		groupType: t,
+		offset:    o,
+		limit:     l,
+		metadata:  m,
+		tree:      tree,
+	}
+	return req, nil
+}
+
+func decodeListMembershipsRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	o, err := apiutil.ReadUintQuery(r, offsetKey, defOffset)
+	if err != nil {
+		return nil, err
+	}
+
+	l, err := apiutil.ReadUintQuery(r, limitKey, defLimit)
+	if err != nil {
+		return nil, err
+	}
+
+	m, err := apiutil.ReadMetadataQuery(r, metadataKey, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req := listMembershipsReq{
+		token:    apiutil.ExtractBearerToken(r),
+		id:       bone.GetValue(r, "memberID"),
+		offset:   o,
+		limit:    l,
+		metadata: m,
+	}
+
+	return req, nil
+}
+
+func decodeGroupCreate(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := createGroupReq{token: apiutil.ExtractBearerToken(r)}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeGroupUpdate(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := updateGroupReq{
+		id:    bone.GetValue(r, "groupID"),
+		token: apiutil.ExtractBearerToken(r),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeGroupRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	req := groupReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "groupID"),
+	}
+
+	return req, nil
+}
+
+func decodeAssignRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	req := assignReq{
+		token:   apiutil.ExtractBearerToken(r),
+		groupID: bone.GetValue(r, "groupID"),
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeUnassignRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	req := unassignReq{
+		assignReq{
+			token:   apiutil.ExtractBearerToken(r),
+			groupID: bone.GetValue(r, "groupID"),
+		},
+	}
+
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
+	w.Header().Set("Content-Type", contentType)
+
+	if ar, ok := response.(mainflux.Response); ok {
+		for k, v := range ar.Headers() {
+			w.Header().Set(k, v)
+		}
+
+		w.WriteHeader(ar.Code())
+
+		if ar.Empty() {
+			return nil
+		}
+	}
+
+	return json.NewEncoder(w).Encode(response)
+}
+
+func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	switch {
+	case errors.Contains(err, errors.ErrMalformedEntity),
+		err == apiutil.ErrMissingID,
+		err == apiutil.ErrEmptyList,
+		err == apiutil.ErrMissingMemberType,
+		err == apiutil.ErrNameSize:
+		w.WriteHeader(http.StatusBadRequest)
+	case errors.Contains(err, errors.ErrAuthentication):
+		w.WriteHeader(http.StatusUnauthorized)
+	case errors.Contains(err, errors.ErrNotFound):
+		w.WriteHeader(http.StatusNotFound)
+	case errors.Contains(err, errors.ErrConflict):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, errors.ErrAuthorization):
+		w.WriteHeader(http.StatusForbidden)
+	case errors.Contains(err, auth.ErrMemberAlreadyAssigned):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, errors.ErrUnsupportedContentType):
+		w.WriteHeader(http.StatusUnsupportedMediaType)
+
+	case errors.Contains(err, errors.ErrCreateEntity),
+		errors.Contains(err, errors.ErrUpdateEntity),
+		errors.Contains(err, errors.ErrViewEntity),
+		errors.Contains(err, errors.ErrRemoveEntity):
+		w.WriteHeader(http.StatusInternalServerError)
+
+	default:
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	if errorVal, ok := err.(errors.Error); ok {
+		w.Header().Set("Content-Type", contentType)
+		if err := json.NewEncoder(w).Encode(apiutil.ErrorRes{Err: errorVal.Msg()}); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
+	}
+}
@@ -0,0 +1,92 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/endpoint"
+	"github.com/mainflux/mainflux/auth"
+)
+
+func issueEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(issueKeyReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		now := time.Now().UTC()
+		newKey := auth.Key{
+			IssuedAt: now,
+			Type:     req.Type,
+		}
+
+		duration := time.Duration(req.Duration * time.Second)
+		if duration != 0 {
+			exp := now.Add(duration)
+			newKey.ExpiresAt = exp
+		}
+
+		key, secret, err := svc.Issue(ctx, req.token, newKey)
+		if err != nil {
+			return nil, err
+		}
+
+		res := issueKeyRes{
+			ID:       key.ID,
+			Value:    secret,
+			IssuedAt: key.IssuedAt,
+		}
+		if !key.ExpiresAt.IsZero() {
+			res.ExpiresAt = &key.ExpiresAt
+		}
+		return res, nil
+	}
+}
+
+func retrieveEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(keyReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		key, err := svc.RetrieveKey(ctx, req.token, req.id)
+
+		if err != nil {
+			return nil, err
+		}
+		ret := retrieveKeyRes{
+			ID:       key.ID,
+			IssuerID: key.IssuerID,
+			Subject:  key.Subject,
+			Type:     key.Type,
+			IssuedAt: key.IssuedAt,
+		}
+		if !key.ExpiresAt.IsZero() {
+			ret.ExpiresAt = &key.ExpiresAt
+		}
+
+		return ret, nil
+	}
+}
+
+func revokeEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(keyReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.Revoke(ctx, req.token, req.id); err != nil {
+			return nil, err
+		}
+
+		return revokeKeyRes{}, nil
+	}
+}
@@ -0,0 +1,298 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keys_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	httpapi "github.com/mainflux/mainflux/auth/api/http"
+	"github.com/mainflux/mainflux/auth/jwt"
+	"github.com/mainflux/mainflux/auth/mocks"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/uuid"
+	"github.com/opentracing/opentracing-go/mocktracer"
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	secret        = "secret"
+	contentType   = "application/json"
+	id            = "123e4567-e89b-12d3-a456-000000000001"
+	email         = "user@example.com"
+	loginDuration = 30 * time.Minute
+)
+
+type issueRequest struct {
+	Duration time.Duration `json:"duration,omitempty"`
+	Type     uint32        `json:"type,omitempty"`
+}
+
+type testRequest struct {
+	client      *http.Client
+	method      string
+	url         string
+	contentType string
+	token       string
+	body        io.Reader
+}
+
+func (tr testRequest) make() (*http.Response, error) {
+	req, err := http.NewRequest(tr.method, tr.url, tr.body)
+	if err != nil {
+		return nil, err
+	}
+	if tr.token != "" {
+		req.Header.Set("Authorization", apiutil.BearerPrefix+tr.token)
+	}
+	if tr.contentType != "" {
+		req.Header.Set("Content-Type", tr.contentType)
+	}
+
+	req.Header.Set("Referer", "http://localhost")
+	return tr.client.Do(req)
+}
+
+func newService() auth.Service {
+	repo := mocks.NewKeyRepository()
+	groupRepo := mocks.NewGroupRepository()
+	idProvider := uuid.NewMock()
+	t := jwt.New(secret)
+
+	mockAuthzDB := map[string][]mocks.MockSubjectSet{}
+	mockAuthzDB[id] = append(mockAuthzDB[id], mocks.MockSubjectSet{Object: "authorities", Relation: "member"})
+	ketoMock := mocks.NewKetoMock(mockAuthzDB)
+
+	return auth.New(repo, groupRepo, idProvider, t, ketoMock, loginDuration)
+}
+
+func newServer(svc auth.Service) *httptest.Server {
+	logger := logger.NewMock()
+	mux := httpapi.MakeHandler(svc, mocktracer.New(), logger)
+	return httptest.NewServer(mux)
+}
+
+func toJSON(data interface{}) string {
+	jsonData, _ := json.Marshal(data)
+	return string(jsonData)
+}
+
+func TestIssue(t *testing.T) {
+	svc := newService()
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+
+	ts := newServer(svc)
+	defer ts.Close()
+	client := ts.Client()
+
+	lk := issueRequest{Type: auth.LoginKey}
+	ak := issueRequest{Type: auth.APIKey, Duration: time.Hour}
+	rk := issueRequest{Type: auth.RecoveryKey}
+
+	cases := []struct {
+		desc   string
+		req    string
+		ct     string
+		token  string
+		status int
+	}{
+		{
+			desc:   "issue login key with empty token",
+			req:    toJSON(lk),
+			ct:     contentType,
+			token:  "",
+			status: http.StatusUnauthorized,
+		},
+		{
+			desc:   "issue API key",
+			req:    toJSON(ak),
+			ct:     contentType,
+			token:  loginSecret,
+			status: http.StatusCreated,
+		},
+		{
+			desc:   "issue recovery key",
+			req:    toJSON(rk),
+			ct:     contentType,
+			token:  loginSecret,
+			status: http.StatusCreated,
+		},
+		{
+			desc:   "issue login key wrong content type",
+			req:    toJSON(lk),
+			ct:     "",
+			token:  loginSecret,
+			status: http.StatusUnsupportedMediaType,
+		},
+		{
+			desc:   "issue recovery key wrong content type",
+			req:    toJSON(rk),
+			ct:     "",
+			token:  loginSecret,
+			status: http.StatusUnsupportedMediaType,
+		},
+		{
+			desc:   "issue key with an invalid token",
+			req:    toJSON(ak),
+			ct:     contentType,
+			token:  "wrong",
+			status: http.StatusUnauthorized,
+		},
+		{
+			desc:   "issue recovery key with empty token",
+			req:    toJSON(rk),
+			ct:     contentType,
+			token:  "",
+			status: http.StatusUnauthorized,
+		},
+		{
+			desc:   "issue key with invalid request",
+			req:    "{",
+			ct:     contentType,
+			token:  loginSecret,
+			status: http.StatusBadRequest,
+		},
+		{
+			desc:   "issue key with invalid JSON",
+			req:    "{invalid}",
+			ct:     contentType,
+			token:  loginSecret,
+			status: http.StatusBadRequest,
+		},
+		{
+			desc:   "issue key with invalid JSON content",
+			req:    `{"Type":{"key":"value"}}`,
+			ct:     contentType,
+			token:  loginSecret,
+			status: http.StatusBadRequest,
+		},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client:      client,
+			method:      http.MethodPost,
+			url:         fmt.Sprintf("%s/keys", ts.URL),
+			contentType: tc.ct,
+			token:       tc.token,
+			body:        strings.NewReader(tc.req),
+		}
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
+
+func TestRetrieve(t *testing.T) {
+	svc := newService()
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+	key := auth.Key{Type: auth.APIKey, IssuedAt: time.Now(), IssuerID: id, Subject: email}
+
+	k, _, err := svc.Issue(context.Background(), loginSecret, key)
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+
+	ts := newServer(svc)
+	defer ts.Close()
+	client := ts.Client()
+
+	cases := []struct {
+		desc   string
+		id     string
+		token  string
+		status int
+	}{
+		{
+			desc:   "retrieve an existing key",
+			id:     k.ID,
+			token:  loginSecret,
+			status: http.StatusOK,
+		},
+		{
+			desc:   "retrieve a non-existing key",
+			id:     "non-existing",
+			token:  loginSecret,
+			status: http.StatusNotFound,
+		},
+		{
+			desc:   "retrieve a key with an invalid token",
+			id:     k.ID,
+			token:  "wrong",
+			status: http.StatusUnauthorized,
+		},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client: client,
+			method: http.MethodGet,
+			url:    fmt.Sprintf("%s/keys/%s", ts.URL, tc.id),
+			token:  tc.token,
+		}
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
+
+func TestRevoke(t *testing.T) {
+	svc := newService()
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+	key := auth.Key{Type: auth.APIKey, IssuedAt: time.Now(), IssuerID: id, Subject: email}
+
+	k, _, err := svc.Issue(context.Background(), loginSecret, key)
+	assert.Nil(t, err, fmt.Sprintf("Issuing login key expected to succeed: %s", err))
+
+	ts := newServer(svc)
+	defer ts.Close()
+	client := ts.Client()
+
+	cases := []struct {
+		desc   string
+		id     string
+		token  string
+		status int
+	}{
+		{
+			desc:   "revoke an existing key",
+			id:     k.ID,
+			token:  loginSecret,
+			status: http.StatusNoContent,
+		},
+		{
+			desc:   "revoke a non-existing key",
+			id:     "non-existing",
+			token:  loginSecret,
+			status: http.StatusNoContent,
+		},
+		{
+			desc:   "revoke key with invalid token",
+			id:     k.ID,
+			token:  "wrong",
+			status: http.StatusUnauthorized},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client: client,
+			method: http.MethodDelete,
+			url:    fmt.Sprintf("%s/keys/%s", ts.URL, tc.id),
+			token:  tc.token,
+		}
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
@@ -0,0 +1,48 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+)
+
+type issueKeyReq struct {
+	token    string
+	Type     uint32        `json:"type,omitempty"`
+	Duration time.Duration `json:"duration,omitempty"`
+}
+
+// It is not possible to issue Reset key using HTTP API.
+func (req issueKeyReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.Type != auth.LoginKey &&
+		req.Type != auth.RecoveryKey &&
+		req.Type != auth.APIKey {
+		return apiutil.ErrInvalidAPIKey
+	}
+
+	return nil
+}
+
+type keyReq struct {
+	token string
+	id    string
+}
+
+func (req keyReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+	return nil
+}
@@ -0,0 +1,71 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/mainflux/mainflux"
+)
+
+var (
+	_ mainflux.Response = (*issueKeyRes)(nil)
+	_ mainflux.Response = (*revokeKeyRes)(nil)
+)
+
+type issueKeyRes struct {
+	ID        string     `json:"id,omitempty"`
+	Value     string     `json:"value,omitempty"`
+	IssuedAt  time.Time  `json:"issued_at,omitempty"`
+	ExpiresAt *time.Time `json:"expires_at,omitempty"`
+}
+
+func (res issueKeyRes) Code() int {
+	return http.StatusCreated
+}
+
+func (res issueKeyRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res issueKeyRes) Empty() bool {
+	return res.Value == ""
+}
+
+type retrieveKeyRes struct {
+	ID        string     `json:"id,omitempty"`
+	IssuerID  string     `json:"issuer_id,omitempty"`
+	Subject   string     `json:"subject,omitempty"`
+	Type      uint32     `json:"type,omitempty"`
+	IssuedAt  time.Time  `json:"issued_at,omitempty"`
+	ExpiresAt *time.Time `json:"expires_at,omitempty"`
+}
+
+func (res retrieveKeyRes) Code() int {
+	return http.StatusOK
+}
+
+func (res retrieveKeyRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res retrieveKeyRes) Empty() bool {
+	return false
+}
+
+type revokeKeyRes struct {
+}
+
+func (res revokeKeyRes) Code() int {
+	return http.StatusNoContent
+}
+
+func (res revokeKeyRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res revokeKeyRes) Empty() bool {
+	return true
+}
@@ -0,0 +1,118 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	kitot "github.com/go-kit/kit/tracing/opentracing"
+	kithttp "github.com/go-kit/kit/transport/http"
+	"github.com/go-zoo/bone"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/opentracing/opentracing-go"
+)
+
+const contentType = "application/json"
+
+// MakeHandler returns a HTTP handler for API endpoints.
+func MakeHandler(svc auth.Service, mux *bone.Mux, tracer opentracing.Tracer, logger logger.Logger) *bone.Mux {
+	opts := []kithttp.ServerOption{
+		kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
+	}
+	mux.Post("/keys", kithttp.NewServer(
+		kitot.TraceServer(tracer, "issue")(issueEndpoint(svc)),
+		decodeIssue,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Get("/keys/:id", kithttp.NewServer(
+		kitot.TraceServer(tracer, "retrieve")(retrieveEndpoint(svc)),
+		decodeKeyReq,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Delete("/keys/:id", kithttp.NewServer(
+		kitot.TraceServer(tracer, "revoke")(revokeEndpoint(svc)),
+		decodeKeyReq,
+		encodeResponse,
+		opts...,
+	))
+
+	return mux
+}
+
+func decodeIssue(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := issueKeyReq{token: apiutil.ExtractBearerToken(r)}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeKeyReq(_ context.Context, r *http.Request) (interface{}, error) {
+	req := keyReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "id"),
+	}
+	return req, nil
+}
+
+func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
+	w.Header().Set("Content-Type", contentType)
+
+	if ar, ok := response.(mainflux.Response); ok {
+		for k, v := range ar.Headers() {
+			w.Header().Set(k, v)
+		}
+
+		w.WriteHeader(ar.Code())
+
+		if ar.Empty() {
+			return nil
+		}
+	}
+
+	return json.NewEncoder(w).Encode(response)
+}
+
+func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	switch {
+	case errors.Contains(err, errors.ErrMalformedEntity),
+		err == apiutil.ErrMissingID,
+		err == apiutil.ErrInvalidAPIKey:
+		w.WriteHeader(http.StatusBadRequest)
+	case errors.Contains(err, errors.ErrAuthentication),
+		err == apiutil.ErrBearerToken:
+		w.WriteHeader(http.StatusUnauthorized)
+	case errors.Contains(err, errors.ErrNotFound):
+		w.WriteHeader(http.StatusNotFound)
+	case errors.Contains(err, errors.ErrConflict):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, errors.ErrUnsupportedContentType):
+		w.WriteHeader(http.StatusUnsupportedMediaType)
+	default:
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	if errorVal, ok := err.(errors.Error); ok {
+		w.Header().Set("Content-Type", contentType)
+		if err := json.NewEncoder(w).Encode(apiutil.ErrorRes{Err: errorVal.Msg()}); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
+	}
+}
@@ -0,0 +1,38 @@
+package policies
+
+import (
+	"context"
+
+	"github.com/go-kit/kit/endpoint"
+	"github.com/mainflux/mainflux/auth"
+)
+
+func createPolicyEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(policiesReq)
+		if err := req.validate(); err != nil {
+			return createPolicyRes{}, err
+		}
+
+		if err := svc.AddPolicies(ctx, req.token, req.Object, req.SubjectIDs, req.Policies); err != nil {
+			return createPolicyRes{}, err
+		}
+
+		return createPolicyRes{created: true}, nil
+	}
+}
+
+func deletePoliciesEndpoint(svc auth.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(policiesReq)
+		if err := req.validate(); err != nil {
+			return deletePoliciesRes{}, err
+		}
+
+		if err := svc.DeletePolicies(ctx, req.token, req.Object, req.SubjectIDs, req.Policies); err != nil {
+			return deletePoliciesRes{}, err
+		}
+
+		return deletePoliciesRes{deleted: true}, nil
+	}
+}
@@ -0,0 +1,336 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package policies_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	httpapi "github.com/mainflux/mainflux/auth/api/http"
+	"github.com/mainflux/mainflux/auth/jwt"
+	"github.com/mainflux/mainflux/auth/mocks"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/uuid"
+	"github.com/opentracing/opentracing-go/mocktracer"
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	secret        = "secret"
+	contentType   = "application/json"
+	id            = uuid.Prefix + "-000000000001"
+	email         = "user@example.com"
+	unauthzID     = uuid.Prefix + "-000000000002"
+	unauthzEmail  = "unauthz@example.com"
+	loginDuration = 30 * time.Minute
+)
+
+type testRequest struct {
+	client      *http.Client
+	method      string
+	url         string
+	contentType string
+	token       string
+	body        io.Reader
+}
+
+func (tr testRequest) make() (*http.Response, error) {
+	req, err := http.NewRequest(tr.method, tr.url, tr.body)
+	if err != nil {
+		return nil, err
+	}
+	if tr.token != "" {
+		req.Header.Set("Authorization", apiutil.BearerPrefix+tr.token)
+	}
+	if tr.contentType != "" {
+		req.Header.Set("Content-Type", tr.contentType)
+	}
+
+	req.Header.Set("Referer", "http://localhost")
+	return tr.client.Do(req)
+}
+
+func newService() auth.Service {
+	repo := mocks.NewKeyRepository()
+	groupRepo := mocks.NewGroupRepository()
+	idProvider := uuid.NewMock()
+	t := jwt.New(secret)
+
+	mockAuthzDB := map[string][]mocks.MockSubjectSet{}
+	mockAuthzDB[id] = append(mockAuthzDB[id], mocks.MockSubjectSet{Object: "authorities", Relation: "member"})
+	mockAuthzDB[unauthzID] = append(mockAuthzDB[unauthzID], mocks.MockSubjectSet{Object: "users", Relation: "member"})
+	ketoMock := mocks.NewKetoMock(mockAuthzDB)
+
+	return auth.New(repo, groupRepo, idProvider, t, ketoMock, loginDuration)
+}
+
+func newServer(svc auth.Service) *httptest.Server {
+	logger := logger.NewMock()
+	mux := httpapi.MakeHandler(svc, mocktracer.New(), logger)
+	return httptest.NewServer(mux)
+}
+
+func toJSON(data interface{}) string {
+	jsonData, _ := json.Marshal(data)
+	return string(jsonData)
+}
+
+type addPolicyRequest struct {
+	SubjectIDs []string `json:"subjects"`
+	Policies   []string `json:"policies"`
+	Object     string   `json:"object"`
+}
+
+func TestAddPolicies(t *testing.T) {
+	svc := newService()
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	_, userLoginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: unauthzID, Subject: unauthzEmail})
+	assert.Nil(t, err, fmt.Sprintf("Issuing unauthorized user's key expected to succeed: %s", err))
+
+	ts := newServer(svc)
+	defer ts.Close()
+	client := ts.Client()
+
+	valid := addPolicyRequest{Object: "obj", Policies: []string{"read"}, SubjectIDs: []string{"user1", "user2"}}
+	multipleValid := addPolicyRequest{Object: "obj", Policies: []string{"write", "delete"}, SubjectIDs: []string{"user1", "user2"}}
+	invalidObject := addPolicyRequest{Object: "", Policies: []string{"read"}, SubjectIDs: []string{"user1", "user2"}}
+	invalidPolicies := addPolicyRequest{Object: "obj", Policies: []string{"read", "invalid"}, SubjectIDs: []string{"user1", "user2"}}
+	invalidSubjects := addPolicyRequest{Object: "obj", Policies: []string{"read", "access"}, SubjectIDs: []string{"", "user2"}}
+
+	cases := []struct {
+		desc   string
+		token  string
+		ct     string
+		status int
+		req    string
+	}{
+		{
+			desc:   "Add policies with authorized access",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusCreated,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add multiple policies to multiple user",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusCreated,
+			req:    toJSON(multipleValid),
+		},
+		{
+			desc:   "Add policies with unauthorized access",
+			token:  userLoginSecret,
+			ct:     contentType,
+			status: http.StatusForbidden,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add policies with invalid token",
+			token:  "invalid",
+			ct:     contentType,
+			status: http.StatusUnauthorized,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add policies with empty token",
+			token:  "",
+			ct:     contentType,
+			status: http.StatusUnauthorized,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add policies with invalid content type",
+			token:  loginSecret,
+			ct:     "text/html",
+			status: http.StatusUnsupportedMediaType,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add policies with empty content type",
+			token:  loginSecret,
+			ct:     "",
+			status: http.StatusUnsupportedMediaType,
+			req:    toJSON(valid),
+		},
+		{
+			desc:   "Add policies with invalid object field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidObject),
+		},
+		{
+			desc:   "Add policies with invalid policies field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidPolicies),
+		},
+		{
+			desc:   "Add policies with invalid subjects field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidSubjects),
+		},
+		{
+			desc:   "Add policies with empty request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    "",
+		},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client:      client,
+			method:      http.MethodPost,
+			url:         fmt.Sprintf("%s/policies", ts.URL),
+			contentType: tc.ct,
+			token:       tc.token,
+			body:        strings.NewReader(tc.req),
+		}
+
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
+
+func TestDeletePolicies(t *testing.T) {
+	svc := newService()
+	_, loginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: id, Subject: email})
+	assert.Nil(t, err, fmt.Sprintf("Issuing user key expected to succeed: %s", err))
+
+	_, userLoginSecret, err := svc.Issue(context.Background(), "", auth.Key{Type: auth.LoginKey, IssuedAt: time.Now(), IssuerID: unauthzID, Subject: unauthzEmail})
+	assert.Nil(t, err, fmt.Sprintf("Issuing unauthorized user's key expected to succeed: %s", err))
+
+	ts := newServer(svc)
+	defer ts.Close()
+	client := ts.Client()
+
+	policies := addPolicyRequest{Object: "obj", Policies: []string{"read", "write", "delete"}, SubjectIDs: []string{"user1", "user2", "user3"}}
+	err = svc.AddPolicies(context.Background(), loginSecret, policies.Object, policies.SubjectIDs, policies.Policies)
+	assert.Nil(t, err, fmt.Sprintf("Adding policies expected to succeed: %s", err))
+
+	validSingleDeleteReq := addPolicyRequest{Object: "obj", Policies: []string{"read"}, SubjectIDs: []string{"user1"}}
+	validMultipleDeleteReq := addPolicyRequest{Object: "obj", Policies: []string{"write", "delete"}, SubjectIDs: []string{"user2", "user3"}}
+	invalidObject := addPolicyRequest{Object: "", Policies: []string{"read"}, SubjectIDs: []string{"user1", "user2"}}
+	invalidPolicies := addPolicyRequest{Object: "obj", Policies: []string{"read", "invalid"}, SubjectIDs: []string{"user1", "user2"}}
+	invalidSubjects := addPolicyRequest{Object: "obj", Policies: []string{"read", "access"}, SubjectIDs: []string{"", "user2"}}
+
+	cases := []struct {
+		desc   string
+		token  string
+		ct     string
+		req    string
+		status int
+	}{
+		{
+			desc:   "Delete policies with unauthorized access",
+			token:  userLoginSecret,
+			ct:     contentType,
+			status: http.StatusForbidden,
+			req:    toJSON(validMultipleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with invalid token",
+			token:  "invalid",
+			ct:     contentType,
+			status: http.StatusUnauthorized,
+			req:    toJSON(validSingleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with empty token",
+			token:  "",
+			ct:     contentType,
+			status: http.StatusUnauthorized,
+			req:    toJSON(validSingleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with authorized access",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusNoContent,
+			req:    toJSON(validSingleDeleteReq),
+		},
+		{
+			desc:   "Delete multiple policies to multiple user",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusNoContent,
+			req:    toJSON(validMultipleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with invalid content type",
+			token:  loginSecret,
+			ct:     "text/html",
+			status: http.StatusUnsupportedMediaType,
+			req:    toJSON(validMultipleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with empty content type",
+			token:  loginSecret,
+			ct:     "",
+			status: http.StatusUnsupportedMediaType,
+			req:    toJSON(validMultipleDeleteReq),
+		},
+		{
+			desc:   "Delete policies with invalid object field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidObject),
+		},
+		{
+			desc:   "Delete policies with invalid policies field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidPolicies),
+		},
+		{
+			desc:   "Delete policies with invalid subjects field in request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    toJSON(invalidSubjects),
+		},
+		{
+			desc:   "Delete policies with empty request body",
+			token:  loginSecret,
+			ct:     contentType,
+			status: http.StatusBadRequest,
+			req:    "",
+		},
+	}
+
+	for _, tc := range cases {
+		req := testRequest{
+			client:      client,
+			method:      http.MethodPut,
+			url:         fmt.Sprintf("%s/policies", ts.URL),
+			contentType: tc.ct,
+			token:       tc.token,
+			body:        strings.NewReader(tc.req),
+		}
+
+		res, err := req.make()
+		assert.Nil(t, err, fmt.Sprintf("%s: unexpected error %s", tc.desc, err))
+		assert.Equal(t, tc.status, res.StatusCode, fmt.Sprintf("%s: expected status code %d got %d", tc.desc, tc.status, res.StatusCode))
+	}
+}
@@ -0,0 +1,64 @@
+package policies
+
+import "github.com/mainflux/mainflux/internal/apiutil"
+
+// Action represents an enum for the policies used in the Mainflux.
+type Action int
+
+const (
+	Create Action = iota
+	Read
+	Write
+	Delete
+	Access
+	Member
+	Unknown
+)
+
+var actions = map[string]Action{
+	"create": Create,
+	"read":   Read,
+	"write":  Write,
+	"delete": Delete,
+	"access": Access,
+	"member": Member,
+}
+
+type policiesReq struct {
+	token      string
+	SubjectIDs []string `json:"subjects"`
+	Policies   []string `json:"policies"`
+	Object     string   `json:"object"`
+}
+
+func (req policiesReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if len(req.SubjectIDs) == 0 {
+		return apiutil.ErrEmptyList
+	}
+
+	if len(req.Policies) == 0 {
+		return apiutil.ErrEmptyList
+	}
+
+	if req.Object == "" {
+		return apiutil.ErrMissingPolicyObj
+	}
+
+	for _, policy := range req.Policies {
+		if _, ok := actions[policy]; !ok {
+			return apiutil.ErrMalformedPolicy
+		}
+	}
+
+	for _, subID := range req.SubjectIDs {
+		if subID == "" {
+			return apiutil.ErrMissingPolicySub
+		}
+	}
+
+	return nil
+}
@@ -0,0 +1,43 @@
+package policies
+
+import "net/http"
+
+type createPolicyRes struct {
+	created bool
+}
+
+func (res createPolicyRes) Code() int {
+	if res.created {
+		return http.StatusCreated
+	}
+
+	return http.StatusOK
+}
+
+func (res createPolicyRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res createPolicyRes) Empty() bool {
+	return false
+}
+
+type deletePoliciesRes struct {
+	deleted bool
+}
+
+func (res deletePoliciesRes) Code() int {
+	if res.deleted {
+		return http.StatusNoContent
+	}
+
+	return http.StatusOK
+}
+
+func (res deletePoliciesRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res deletePoliciesRes) Empty() bool {
+	return true
+}
@@ -0,0 +1,107 @@
+package policies
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	kitot "github.com/go-kit/kit/tracing/opentracing"
+	kithttp "github.com/go-kit/kit/transport/http"
+	"github.com/go-zoo/bone"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/opentracing/opentracing-go"
+)
+
+const contentType = "application/json"
+
+// MakeHandler returns a HTTP handler for API endpoints.
+func MakeHandler(svc auth.Service, mux *bone.Mux, tracer opentracing.Tracer, logger logger.Logger) *bone.Mux {
+	opts := []kithttp.ServerOption{
+		kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
+	}
+
+	mux.Post("/policies", kithttp.NewServer(
+		kitot.TraceServer(tracer, "create_policy_bulk")(createPolicyEndpoint(svc)),
+		decodePoliciesRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	mux.Put("/policies", kithttp.NewServer(
+		kitot.TraceServer(tracer, "delete_policies")(deletePoliciesEndpoint(svc)),
+		decodePoliciesRequest,
+		encodeResponse,
+		opts...,
+	))
+
+	return mux
+}
+
+func decodePoliciesRequest(ctx context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := policiesReq{token: apiutil.ExtractBearerToken(r)}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
+	w.Header().Set("Content-Type", contentType)
+
+	if ar, ok := response.(mainflux.Response); ok {
+		for k, v := range ar.Headers() {
+			w.Header().Set(k, v)
+		}
+
+		w.WriteHeader(ar.Code())
+
+		if ar.Empty() {
+			return nil
+		}
+	}
+
+	return json.NewEncoder(w).Encode(response)
+}
+
+func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	switch {
+	case errors.Contains(err, errors.ErrMalformedEntity),
+		err == apiutil.ErrEmptyList,
+		err == apiutil.ErrMissingPolicyObj,
+		err == apiutil.ErrMissingPolicySub,
+		err == apiutil.ErrMalformedPolicy:
+		w.WriteHeader(http.StatusBadRequest)
+	case errors.Contains(err, errors.ErrAuthentication),
+		err == apiutil.ErrBearerToken:
+		w.WriteHeader(http.StatusUnauthorized)
+	case errors.Contains(err, errors.ErrNotFound):
+		w.WriteHeader(http.StatusNotFound)
+	case errors.Contains(err, errors.ErrConflict):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, errors.ErrAuthorization):
+		w.WriteHeader(http.StatusForbidden)
+	case errors.Contains(err, auth.ErrMemberAlreadyAssigned):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, errors.ErrUnsupportedContentType):
+		w.WriteHeader(http.StatusUnsupportedMediaType)
+	default:
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	if errorVal, ok := err.(errors.Error); ok {
+		w.Header().Set("Content-Type", contentType)
+		if err := json.NewEncoder(w).Encode(apiutil.ErrorRes{Err: errorVal.Msg()}); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
+	}
+}
@@ -0,0 +1,28 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+package http
+
+import (
+	"net/http"
+
+	"github.com/go-zoo/bone"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/auth/api/http/groups"
+	"github.com/mainflux/mainflux/auth/api/http/keys"
+	"github.com/mainflux/mainflux/auth/api/http/policies"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/opentracing/opentracing-go"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// MakeHandler returns a HTTP handler for API endpoints.
+func MakeHandler(svc auth.Service, tracer opentracing.Tracer, logger logger.Logger) http.Handler {
+	mux := bone.New()
+	mux = keys.MakeHandler(svc, mux, tracer, logger)
+	mux = groups.MakeHandler(svc, mux, tracer, logger)
+	mux = policies.MakeHandler(svc, mux, tracer, logger)
+	mux.GetFunc("/health", mainflux.Health("auth"))
+	mux.Handle("/metrics", promhttp.Handler())
+	return mux
+}
@@ -0,0 +1,313 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !test
+
+package api
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	log "github.com/mainflux/mainflux/logger"
+)
+
+var _ auth.Service = (*loggingMiddleware)(nil)
+
+type loggingMiddleware struct {
+	logger log.Logger
+	svc    auth.Service
+}
+
+// LoggingMiddleware adds logging facilities to the core service.
+func LoggingMiddleware(svc auth.Service, logger log.Logger) auth.Service {
+	return &loggingMiddleware{logger, svc}
+}
+
+func (lm *loggingMiddleware) ListPolicies(ctx context.Context, pr auth.PolicyReq) (p auth.PolicyPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_policies took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListPolicies(ctx, pr)
+}
+
+func (lm *loggingMiddleware) Issue(ctx context.Context, token string, newKey auth.Key) (key auth.Key, secret string, err error) {
+	defer func(begin time.Time) {
+		d := "infinite duration"
+		if !key.ExpiresAt.IsZero() {
+			d = fmt.Sprintf("the key with expiration date %v", key.ExpiresAt)
+		}
+		message := fmt.Sprintf("Method issue for %s took %s to complete", d, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Issue(ctx, token, newKey)
+}
+
+func (lm *loggingMiddleware) Revoke(ctx context.Context, token, id string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method revoke for key %s took %s to complete", id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Revoke(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) RetrieveKey(ctx context.Context, token, id string) (key auth.Key, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method retrieve for key %s took %s to complete", id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.RetrieveKey(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) Identify(ctx context.Context, key string) (id auth.Identity, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method identify took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Identify(ctx, key)
+}
+
+func (lm *loggingMiddleware) Authorize(ctx context.Context, pr auth.PolicyReq) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method authorize took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+	return lm.svc.Authorize(ctx, pr)
+}
+
+func (lm *loggingMiddleware) AddPolicy(ctx context.Context, pr auth.PolicyReq) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method add_policy took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+	return lm.svc.AddPolicy(ctx, pr)
+}
+
+func (lm *loggingMiddleware) AddPolicies(ctx context.Context, token, object string, subjectIDs, relations []string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method create_policy_bulk took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.AddPolicies(ctx, token, object, subjectIDs, relations)
+}
+
+func (lm *loggingMiddleware) DeletePolicy(ctx context.Context, pr auth.PolicyReq) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method delete_policy took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+	return lm.svc.DeletePolicy(ctx, pr)
+}
+
+func (lm *loggingMiddleware) DeletePolicies(ctx context.Context, token, object string, subjectIDs, relations []string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method delete_policies took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+	return lm.svc.DeletePolicies(ctx, token, object, subjectIDs, relations)
+}
+
+func (lm *loggingMiddleware) CreateGroup(ctx context.Context, token string, group auth.Group) (g auth.Group, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method create_group for token %s and name %s took %s to complete", token, group.Name, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.CreateGroup(ctx, token, group)
+}
+
+func (lm *loggingMiddleware) UpdateGroup(ctx context.Context, token string, group auth.Group) (gr auth.Group, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method update_group for token %s and name %s took %s to complete", token, group.Name, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.UpdateGroup(ctx, token, group)
+}
+
+func (lm *loggingMiddleware) RemoveGroup(ctx context.Context, token string, id string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method remove_group for token %s and id %s took %s to complete", token, id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.RemoveGroup(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) ViewGroup(ctx context.Context, token, id string) (group auth.Group, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method view_group for token %s and id %s took %s to complete", token, id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ViewGroup(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) ListGroups(ctx context.Context, token string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_groups for token %s took %s to complete", token, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListGroups(ctx, token, pm)
+}
+
+func (lm *loggingMiddleware) ListChildren(ctx context.Context, token, parentID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_children for token %s and parent %s took %s to complete", token, parentID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListChildren(ctx, token, parentID, pm)
+}
+
+func (lm *loggingMiddleware) ListParents(ctx context.Context, token, childID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_parents for token %s and child %s took for child %s to complete", token, childID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListParents(ctx, token, childID, pm)
+}
+
+func (lm *loggingMiddleware) ListMembers(ctx context.Context, token, groupID, groupType string, pm auth.PageMetadata) (gp auth.MemberPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_members for token %s and group id %s took %s to complete", token, groupID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListMembers(ctx, token, groupID, groupType, pm)
+}
+
+func (lm *loggingMiddleware) ListMemberships(ctx context.Context, token, memberID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list_memberships for token %s and member id %s took %s to complete", token, memberID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ListMemberships(ctx, token, memberID, pm)
+}
+
+func (lm *loggingMiddleware) Assign(ctx context.Context, token, groupID, groupType string, memberIDs ...string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method assign for token %s and member %s group id %s took %s to complete", token, memberIDs, groupID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Assign(ctx, token, groupID, groupType, memberIDs...)
+}
+
+func (lm *loggingMiddleware) Unassign(ctx context.Context, token string, groupID string, memberIDs ...string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method unassign for token %s and member %s group id %s took %s to complete", token, memberIDs, groupID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Unassign(ctx, token, groupID, memberIDs...)
+}
+
+func (lm *loggingMiddleware) AssignGroupAccessRights(ctx context.Context, token, thingGroupID, userGroupID string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method share_group_access took %s to complete", time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.AssignGroupAccessRights(ctx, token, thingGroupID, userGroupID)
+}
@@ -0,0 +1,222 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !test
+
+package api
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/metrics"
+	"github.com/mainflux/mainflux/auth"
+)
+
+var _ auth.Service = (*metricsMiddleware)(nil)
+
+type metricsMiddleware struct {
+	counter metrics.Counter
+	latency metrics.Histogram
+	svc     auth.Service
+}
+
+// MetricsMiddleware instruments core service by tracking request count and latency.
+func MetricsMiddleware(svc auth.Service, counter metrics.Counter, latency metrics.Histogram) auth.Service {
+	return &metricsMiddleware{
+		counter: counter,
+		latency: latency,
+		svc:     svc,
+	}
+}
+
+func (ms *metricsMiddleware) ListPolicies(ctx context.Context, pr auth.PolicyReq) (p auth.PolicyPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "list_policies").Add(1)
+		ms.latency.With("method", "list_policies").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListPolicies(ctx, pr)
+}
+
+func (ms *metricsMiddleware) Issue(ctx context.Context, token string, key auth.Key) (auth.Key, string, error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "issue_key").Add(1)
+		ms.latency.With("method", "issue_key").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.Issue(ctx, token, key)
+}
+
+func (ms *metricsMiddleware) Revoke(ctx context.Context, token, id string) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "revoke_key").Add(1)
+		ms.latency.With("method", "revoke_key").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.Revoke(ctx, token, id)
+}
+
+func (ms *metricsMiddleware) RetrieveKey(ctx context.Context, token, id string) (auth.Key, error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "retrieve_key").Add(1)
+		ms.latency.With("method", "retrieve_key").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.RetrieveKey(ctx, token, id)
+}
+
+func (ms *metricsMiddleware) Identify(ctx context.Context, token string) (auth.Identity, error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "identify").Add(1)
+		ms.latency.With("method", "identify").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.Identify(ctx, token)
+}
+
+func (ms *metricsMiddleware) Authorize(ctx context.Context, pr auth.PolicyReq) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "authorize").Add(1)
+		ms.latency.With("method", "authorize").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.Authorize(ctx, pr)
+}
+
+func (ms *metricsMiddleware) AddPolicy(ctx context.Context, pr auth.PolicyReq) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "add_policy").Add(1)
+		ms.latency.With("method", "add_policy").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.AddPolicy(ctx, pr)
+}
+
+func (ms *metricsMiddleware) AddPolicies(ctx context.Context, token, object string, subjectIDs, relations []string) (err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "create_policy_bulk").Add(1)
+		ms.latency.With("method", "create_policy_bulk").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.AddPolicies(ctx, token, object, subjectIDs, relations)
+}
+
+func (ms *metricsMiddleware) DeletePolicy(ctx context.Context, pr auth.PolicyReq) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "delete_policy").Add(1)
+		ms.latency.With("method", "delete_policy").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.DeletePolicy(ctx, pr)
+}
+
+func (ms *metricsMiddleware) DeletePolicies(ctx context.Context, token, object string, subjectIDs, relations []string) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "delete_policies").Add(1)
+		ms.latency.With("method", "delete_policies").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.DeletePolicies(ctx, token, object, subjectIDs, relations)
+}
+
+func (ms *metricsMiddleware) CreateGroup(ctx context.Context, token string, group auth.Group) (gr auth.Group, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "create_group").Add(1)
+		ms.latency.With("method", "create_group").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.CreateGroup(ctx, token, group)
+}
+
+func (ms *metricsMiddleware) UpdateGroup(ctx context.Context, token string, group auth.Group) (gr auth.Group, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "update_group").Add(1)
+		ms.latency.With("method", "update_group").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.UpdateGroup(ctx, token, group)
+}
+
+func (ms *metricsMiddleware) RemoveGroup(ctx context.Context, token string, id string) (err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "remove_group").Add(1)
+		ms.latency.With("method", "remove_group").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+	return ms.svc.RemoveGroup(ctx, token, id)
+}
+
+func (ms *metricsMiddleware) ViewGroup(ctx context.Context, token, id string) (group auth.Group, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "view_group").Add(1)
+		ms.latency.With("method", "view_group").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ViewGroup(ctx, token, id)
+}
+
+func (ms *metricsMiddleware) ListGroups(ctx context.Context, token string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "list_groups").Add(1)
+		ms.latency.With("method", "list_groups").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListGroups(ctx, token, pm)
+}
+
+func (ms *metricsMiddleware) ListParents(ctx context.Context, token, childID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "parents").Add(1)
+		ms.latency.With("method", "parents").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListParents(ctx, token, childID, pm)
+}
+
+func (ms *metricsMiddleware) ListChildren(ctx context.Context, token, parentID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "list_children").Add(1)
+		ms.latency.With("method", "list_children").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListChildren(ctx, token, parentID, pm)
+}
+
+func (ms *metricsMiddleware) ListMembers(ctx context.Context, token, groupID, groupType string, pm auth.PageMetadata) (gp auth.MemberPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "list_members").Add(1)
+		ms.latency.With("method", "list_members").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListMembers(ctx, token, groupID, groupType, pm)
+}
+
+func (ms *metricsMiddleware) ListMemberships(ctx context.Context, token, memberID string, pm auth.PageMetadata) (gp auth.GroupPage, err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "list_memberships").Add(1)
+		ms.latency.With("method", "list_memberships").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.ListMemberships(ctx, token, memberID, pm)
+}
+
+func (ms *metricsMiddleware) Assign(ctx context.Context, token, groupID, groupType string, memberIDs ...string) (err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "assign").Add(1)
+		ms.latency.With("method", "assign").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.Assign(ctx, token, groupID, groupType, memberIDs...)
+}
+
+func (ms *metricsMiddleware) Unassign(ctx context.Context, token, groupID string, memberIDs ...string) (err error) {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "unassign").Add(1)
+		ms.latency.With("method", "unassign").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.Unassign(ctx, token, groupID, memberIDs...)
+}
+
+func (ms *metricsMiddleware) AssignGroupAccessRights(ctx context.Context, token, thingGroupID, userGroupID string) error {
+	defer func(begin time.Time) {
+		ms.counter.With("method", "share_group_access").Add(1)
+		ms.latency.With("method", "share_group_access").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return ms.svc.AssignGroupAccessRights(ctx, token, thingGroupID, userGroupID)
+}
@@ -0,0 +1,162 @@
+package auth
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+const (
+	// MaxLevel represents the maximum group hierarchy level.
+	MaxLevel = uint64(5)
+	// MinLevel represents the minimum group hierarchy level.
+	MinLevel = uint64(1)
+)
+
+var (
+	// ErrAssignToGroup indicates failure to assign member to a group.
+	ErrAssignToGroup = errors.New("failed to assign member to a group")
+
+	// ErrUnassignFromGroup indicates failure to unassign member from a group.
+	ErrUnassignFromGroup = errors.New("failed to unassign member from a group")
+
+	// ErrMissingParent indicates that parent can't be found
+	ErrMissingParent = errors.New("failed to retrieve parent")
+
+	// ErrGroupNotEmpty indicates group is not empty, can't be deleted.
+	ErrGroupNotEmpty = errors.New("group is not empty")
+
+	// ErrMemberAlreadyAssigned indicates that members is already assigned.
+	ErrMemberAlreadyAssigned = errors.New("member is already assigned")
+)
+
+// GroupMetadata defines the Metadata type.
+type GroupMetadata map[string]interface{}
+
+// Member represents the member information.
+type Member struct {
+	ID   string
+	Type string
+}
+
+// Group represents the group information.
+type Group struct {
+	ID          string
+	OwnerID     string
+	ParentID    string
+	Name        string
+	Description string
+	Metadata    GroupMetadata
+	// Indicates a level in tree hierarchy.
+	// Root node is level 1.
+	Level int
+	// Path in a tree consisting of group ids
+	// parentID1.parentID2.childID1
+	// e.g. 01EXPM5Z8HRGFAEWTETR1X1441.01EXPKW2TVK74S5NWQ979VJ4PJ.01EXPKW2TVK74S5NWQ979VJ4PJ
+	Path      string
+	Children  []*Group
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+// PageMetadata contains page metadata that helps navigation.
+type PageMetadata struct {
+	Total    uint64
+	Offset   uint64
+	Limit    uint64
+	Size     uint64
+	Level    uint64
+	Name     string
+	Type     string
+	Metadata GroupMetadata
+}
+
+// GroupPage contains page related metadata as well as list of groups that
+// belong to this page.
+type GroupPage struct {
+	PageMetadata
+	Groups []Group
+}
+
+// MemberPage contains page related metadata as well as list of members that
+// belong to this page.
+type MemberPage struct {
+	PageMetadata
+	Members []Member
+}
+
+// GroupService specifies an API that must be fullfiled by the domain service
+// implementation, and all of its decorators (e.g. logging & metrics).
+type GroupService interface {
+	// CreateGroup creates new  group.
+	CreateGroup(ctx context.Context, token string, g Group) (Group, error)
+
+	// UpdateGroup updates the group identified by the provided ID.
+	UpdateGroup(ctx context.Context, token string, g Group) (Group, error)
+
+	// ViewGroup retrieves data about the group identified by ID.
+	ViewGroup(ctx context.Context, token, id string) (Group, error)
+
+	// ListGroups retrieves groups.
+	ListGroups(ctx context.Context, token string, pm PageMetadata) (GroupPage, error)
+
+	// ListChildren retrieves groups that are children to group identified by parentID
+	ListChildren(ctx context.Context, token, parentID string, pm PageMetadata) (GroupPage, error)
+
+	// ListParents retrieves groups that are parent to group identified by childID.
+	ListParents(ctx context.Context, token, childID string, pm PageMetadata) (GroupPage, error)
+
+	// ListMembers retrieves everything that is assigned to a group identified by groupID.
+	ListMembers(ctx context.Context, token, groupID, groupType string, pm PageMetadata) (MemberPage, error)
+
+	// ListMemberships retrieves all groups for member that is identified with memberID belongs to.
+	ListMemberships(ctx context.Context, token, memberID string, pm PageMetadata) (GroupPage, error)
+
+	// RemoveGroup removes the group identified with the provided ID.
+	RemoveGroup(ctx context.Context, token, id string) error
+
+	// Assign adds a member with memberID into the group identified by groupID.
+	Assign(ctx context.Context, token, groupID, groupType string, memberIDs ...string) error
+
+	// Unassign removes member with memberID from group identified by groupID.
+	Unassign(ctx context.Context, token, groupID string, memberIDs ...string) error
+
+	// AssignGroupAccessRights adds access rights on thing groups to user group.
+	AssignGroupAccessRights(ctx context.Context, token, thingGroupID, userGroupID string) error
+}
+
+// GroupRepository specifies a group persistence API.
+type GroupRepository interface {
+	// Save group
+	Save(ctx context.Context, g Group) (Group, error)
+
+	// Update a group
+	Update(ctx context.Context, g Group) (Group, error)
+
+	// Delete a group
+	Delete(ctx context.Context, id string) error
+
+	// RetrieveByID retrieves group by its id
+	RetrieveByID(ctx context.Context, id string) (Group, error)
+
+	// RetrieveAll retrieves all groups.
+	RetrieveAll(ctx context.Context, pm PageMetadata) (GroupPage, error)
+
+	// RetrieveAllParents retrieves all groups that are ancestors to the group with given groupID.
+	RetrieveAllParents(ctx context.Context, groupID string, pm PageMetadata) (GroupPage, error)
+
+	// RetrieveAllChildren retrieves all children from group with given groupID up to the hierarchy level.
+	RetrieveAllChildren(ctx context.Context, groupID string, pm PageMetadata) (GroupPage, error)
+
+	//  Retrieves list of groups that member belongs to
+	Memberships(ctx context.Context, memberID string, pm PageMetadata) (GroupPage, error)
+
+	// Members retrieves everything that is assigned to a group identified by groupID.
+	Members(ctx context.Context, groupID, groupType string, pm PageMetadata) (MemberPage, error)
+
+	// Assign adds a member to group.
+	Assign(ctx context.Context, groupID, groupType string, memberIDs ...string) error
+
+	// Unassign removes a member from a group
+	Unassign(ctx context.Context, groupID string, memberIDs ...string) error
+}
@@ -0,0 +1,107 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package jwt_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/auth/jwt"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const secret = "test"
+
+func key() auth.Key {
+	exp := time.Now().UTC().Add(10 * time.Minute).Round(time.Second)
+	return auth.Key{
+		ID:        "id",
+		Type:      auth.LoginKey,
+		Subject:   "user@email.com",
+		IssuerID:  "",
+		IssuedAt:  time.Now().UTC().Add(-10 * time.Second).Round(time.Second),
+		ExpiresAt: exp,
+	}
+}
+
+func TestIssue(t *testing.T) {
+	tokenizer := jwt.New(secret)
+
+	cases := []struct {
+		desc string
+		key  auth.Key
+		err  error
+	}{
+		{
+			desc: "issue new token",
+			key:  key(),
+			err:  nil,
+		},
+	}
+
+	for _, tc := range cases {
+		_, err := tokenizer.Issue(tc.key)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s expected %s, got %s", tc.desc, tc.err, err))
+	}
+}
+
+func TestParse(t *testing.T) {
+	tokenizer := jwt.New(secret)
+
+	token, err := tokenizer.Issue(key())
+	require.Nil(t, err, fmt.Sprintf("issuing key expected to succeed: %s", err))
+
+	apiKey := key()
+	apiKey.Type = auth.APIKey
+	apiKey.ExpiresAt = time.Now().UTC().Add(-1 * time.Minute).Round(time.Second)
+	apiToken, err := tokenizer.Issue(apiKey)
+	require.Nil(t, err, fmt.Sprintf("issuing user key expected to succeed: %s", err))
+
+	expKey := key()
+	expKey.ExpiresAt = time.Now().UTC().Add(-1 * time.Minute).Round(time.Second)
+	expToken, err := tokenizer.Issue(expKey)
+	require.Nil(t, err, fmt.Sprintf("issuing expired key expected to succeed: %s", err))
+
+	cases := []struct {
+		desc  string
+		key   auth.Key
+		token string
+		err   error
+	}{
+		{
+			desc:  "parse valid key",
+			key:   key(),
+			token: token,
+			err:   nil,
+		},
+		{
+			desc:  "parse ivalid key",
+			key:   auth.Key{},
+			token: "invalid",
+			err:   errors.ErrAuthentication,
+		},
+		{
+			desc:  "parse expired key",
+			key:   auth.Key{},
+			token: expToken,
+			err:   auth.ErrKeyExpired,
+		},
+		{
+			desc:  "parse expired API key",
+			key:   apiKey,
+			token: apiToken,
+			err:   auth.ErrAPIKeyExpired,
+		},
+	}
+
+	for _, tc := range cases {
+		key, err := tokenizer.Parse(tc.token)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s expected %s, got %s", tc.desc, tc.err, err))
+		assert.Equal(t, tc.key, key, fmt.Sprintf("%s expected %v, got %v", tc.desc, tc.key, key))
+	}
+}
@@ -0,0 +1,101 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package jwt
+
+import (
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+const issuerName = "mainflux.auth"
+
+type claims struct {
+	jwt.StandardClaims
+	IssuerID string  `json:"issuer_id,omitempty"`
+	Type     *uint32 `json:"type,omitempty"`
+}
+
+func (c claims) Valid() error {
+	if c.Type == nil || *c.Type > auth.APIKey || c.Issuer != issuerName {
+		return errors.ErrMalformedEntity
+	}
+
+	return c.StandardClaims.Valid()
+}
+
+type tokenizer struct {
+	secret string
+}
+
+// New returns new JWT Tokenizer.
+func New(secret string) auth.Tokenizer {
+	return tokenizer{secret: secret}
+}
+
+func (svc tokenizer) Issue(key auth.Key) (string, error) {
+	claims := claims{
+		StandardClaims: jwt.StandardClaims{
+			Issuer:   issuerName,
+			Subject:  key.Subject,
+			IssuedAt: key.IssuedAt.UTC().Unix(),
+		},
+		IssuerID: key.IssuerID,
+		Type:     &key.Type,
+	}
+
+	if !key.ExpiresAt.IsZero() {
+		claims.ExpiresAt = key.ExpiresAt.UTC().Unix()
+	}
+	if key.ID != "" {
+		claims.Id = key.ID
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(svc.secret))
+}
+
+func (svc tokenizer) Parse(token string) (auth.Key, error) {
+	c := claims{}
+	_, err := jwt.ParseWithClaims(token, &c, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.ErrAuthentication
+		}
+		return []byte(svc.secret), nil
+	})
+
+	if err != nil {
+		if e, ok := err.(*jwt.ValidationError); ok && e.Errors == jwt.ValidationErrorExpired {
+			// Expired User key needs to be revoked.
+			if c.Type != nil && *c.Type == auth.APIKey {
+				return c.toKey(), auth.ErrAPIKeyExpired
+			}
+			return auth.Key{}, errors.Wrap(auth.ErrKeyExpired, err)
+		}
+		return auth.Key{}, errors.Wrap(errors.ErrAuthentication, err)
+	}
+
+	return c.toKey(), nil
+}
+
+func (c claims) toKey() auth.Key {
+	key := auth.Key{
+		ID:       c.Id,
+		IssuerID: c.IssuerID,
+		Subject:  c.Subject,
+		IssuedAt: time.Unix(c.IssuedAt, 0).UTC(),
+	}
+	if c.ExpiresAt != 0 {
+		key.ExpiresAt = time.Unix(c.ExpiresAt, 0).UTC()
+	}
+
+	// Default type is 0.
+	if c.Type != nil {
+		key.Type = *c.Type
+	}
+
+	return key
+}
@@ -0,0 +1,5 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package keto contains PolicyAgent implementation using Keto.
+package keto
@@ -0,0 +1,172 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package keto
+
+import (
+	"context"
+	"regexp"
+	"strings"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+	acl "github.com/ory/keto/proto/ory/keto/acl/v1alpha1"
+)
+
+const (
+	subjectSetRegex = "^.{1,}:.{1,}#.{1,}$" // expected subject set structure is <namespace>:<object>#<relation>
+	ketoNamespace   = "members"
+)
+
+type policyAgent struct {
+	writer  acl.WriteServiceClient
+	checker acl.CheckServiceClient
+	reader  acl.ReadServiceClient
+}
+
+// NewPolicyAgent returns a gRPC communication functionalities
+// to communicate with ORY Keto.
+func NewPolicyAgent(checker acl.CheckServiceClient, writer acl.WriteServiceClient, reader acl.ReadServiceClient) auth.PolicyAgent {
+	return policyAgent{checker: checker, writer: writer, reader: reader}
+}
+
+func (pa policyAgent) CheckPolicy(ctx context.Context, pr auth.PolicyReq) error {
+	res, err := pa.checker.Check(context.Background(), &acl.CheckRequest{
+		Namespace: ketoNamespace,
+		Object:    pr.Object,
+		Relation:  pr.Relation,
+		Subject:   getSubject(pr),
+	})
+	if err != nil {
+		return errors.Wrap(err, errors.ErrAuthorization)
+	}
+	if !res.GetAllowed() {
+		return errors.ErrAuthorization
+	}
+	return nil
+}
+
+func (pa policyAgent) AddPolicy(ctx context.Context, pr auth.PolicyReq) error {
+	var ss *acl.Subject
+	switch isSubjectSet(pr.Subject) {
+	case true:
+		namespace, object, relation := parseSubjectSet(pr.Subject)
+		ss = &acl.Subject{
+			Ref: &acl.Subject_Set{Set: &acl.SubjectSet{Namespace: namespace, Object: object, Relation: relation}},
+		}
+	default:
+		ss = &acl.Subject{Ref: &acl.Subject_Id{Id: pr.Subject}}
+	}
+
+	trt := pa.writer.TransactRelationTuples
+	_, err := trt(context.Background(), &acl.TransactRelationTuplesRequest{
+		RelationTupleDeltas: []*acl.RelationTupleDelta{
+			{
+				Action: acl.RelationTupleDelta_INSERT,
+				RelationTuple: &acl.RelationTuple{
+					Namespace: ketoNamespace,
+					Object:    pr.Object,
+					Relation:  pr.Relation,
+					Subject:   ss,
+				},
+			},
+		},
+	})
+	return err
+}
+
+func (pa policyAgent) DeletePolicy(ctx context.Context, pr auth.PolicyReq) error {
+	trt := pa.writer.TransactRelationTuples
+	_, err := trt(context.Background(), &acl.TransactRelationTuplesRequest{
+		RelationTupleDeltas: []*acl.RelationTupleDelta{
+			{
+				Action: acl.RelationTupleDelta_DELETE,
+				RelationTuple: &acl.RelationTuple{
+					Namespace: ketoNamespace,
+					Object:    pr.Object,
+					Relation:  pr.Relation,
+					Subject: &acl.Subject{Ref: &acl.Subject_Id{
+						Id: pr.Subject,
+					}},
+				},
+			},
+		},
+	})
+	return err
+}
+
+func (pa policyAgent) RetrievePolicies(ctx context.Context, pr auth.PolicyReq) ([]*acl.RelationTuple, error) {
+	var ss *acl.Subject
+	switch isSubjectSet(pr.Subject) {
+	case true:
+		namespace, object, relation := parseSubjectSet(pr.Subject)
+		ss = &acl.Subject{
+			Ref: &acl.Subject_Set{Set: &acl.SubjectSet{Namespace: namespace, Object: object, Relation: relation}},
+		}
+	default:
+		ss = &acl.Subject{Ref: &acl.Subject_Id{Id: pr.Subject}}
+	}
+
+	res, err := pa.reader.ListRelationTuples(ctx, &acl.ListRelationTuplesRequest{
+		Query: &acl.ListRelationTuplesRequest_Query{
+			Namespace: ketoNamespace,
+			Relation:  pr.Relation,
+			Subject:   ss,
+		},
+	})
+	if err != nil {
+		return []*acl.RelationTuple{}, err
+	}
+
+	tuple := res.GetRelationTuples()
+	for res.NextPageToken != "" {
+		tuple = append(tuple, res.GetRelationTuples()...)
+	}
+
+	return tuple, nil
+}
+
+// getSubject returns a 'subject' field for ACL(access control lists).
+// If the given PolicyReq argument contains a subject as subject set,
+// it returns subject set; otherwise, it returns a subject.
+func getSubject(pr auth.PolicyReq) *acl.Subject {
+	if isSubjectSet(pr.Subject) {
+		return &acl.Subject{
+			Ref: &acl.Subject_Set{Set: &acl.SubjectSet{
+				Namespace: ketoNamespace,
+				Object:    pr.Object,
+				Relation:  pr.Relation,
+			}},
+		}
+	}
+
+	return &acl.Subject{Ref: &acl.Subject_Id{Id: pr.Subject}}
+}
+
+// isSubjectSet returns true when given subject is subject set.
+// Otherwise, it returns false.
+func isSubjectSet(subject string) bool {
+	r, err := regexp.Compile(subjectSetRegex)
+	if err != nil {
+		return false
+	}
+	return r.MatchString(subject)
+}
+
+func parseSubjectSet(subjectSet string) (namespace, object, relation string) {
+	r := strings.Split(subjectSet, ":")
+	if len(r) != 2 {
+		return
+	}
+	namespace = r[0]
+
+	r = strings.Split(r[1], "#")
+	if len(r) != 2 {
+		return
+	}
+
+	object = r[0]
+	relation = r[1]
+
+	return
+}
@@ -0,0 +1,79 @@
+package keto
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/mainflux/mainflux/auth"
+	acl "github.com/ory/keto/proto/ory/keto/acl/v1alpha1"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsSubjectSet(t *testing.T) {
+	cases := []struct {
+		desc       string
+		subjectSet string
+		result     bool
+	}{
+		{
+			desc:       "check valid subject set",
+			subjectSet: "namespace:object#relation",
+			result:     true,
+		},
+		{
+			desc:       "check invalid subject set, missing namespace field",
+			subjectSet: ":object#relation",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, missing object field",
+			subjectSet: "namespace:#relation",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, missing relation field",
+			subjectSet: "namespace:object#",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, empty subject set",
+			subjectSet: ":#",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, missing subject set identifier",
+			subjectSet: "namespace:#relation",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, missing object field",
+			subjectSet: "namespace:object",
+			result:     false,
+		},
+		{
+			desc:       "check invalid subject set, unexpected object field",
+			subjectSet: "namespace:object@relation",
+			result:     false,
+		},
+	}
+
+	for _, tc := range cases {
+		iss := isSubjectSet(tc.subjectSet)
+		assert.Equal(t, iss, tc.result, fmt.Sprintf("%s expected to be %v, got %v\n", tc.desc, tc.result, iss))
+	}
+
+}
+
+func TestGetSubject(t *testing.T) {
+	p1 := auth.PolicyReq{Subject: "subject", Object: "object", Relation: "relation"}
+	s1 := getSubject(p1)
+	ref1 := s1.GetRef()
+	_, ok := ref1.(*acl.Subject_Id)
+	assert.True(t, ok, fmt.Errorf("subject reference of %#v is expected to be (*acl.Subject_Id), got %T", p1, ref1))
+
+	p2 := auth.PolicyReq{Subject: "members:group#access", Object: "object", Relation: "relation"}
+	s2 := getSubject(p2)
+	ref2 := s2.GetRef()
+	_, ok = ref2.(*acl.Subject_Set)
+	assert.True(t, ok, fmt.Errorf("subject reference of %#v is expected to be (*acl.Subject_Set), got %T", p2, ref2))
+}
@@ -0,0 +1,68 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package auth
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+var (
+	// ErrInvalidKeyIssuedAt indicates that the Key is being used before it's issued.
+	ErrInvalidKeyIssuedAt = errors.New("invalid issue time")
+
+	// ErrKeyExpired indicates that the Key is expired.
+	ErrKeyExpired = errors.New("use of expired key")
+
+	// ErrAPIKeyExpired indicates that the Key is expired
+	// and that the key type is API key.
+	ErrAPIKeyExpired = errors.New("use of expired API key")
+)
+
+const (
+	// LoginKey is temporary User key received on successfull login.
+	LoginKey uint32 = iota
+	// RecoveryKey represents a key for resseting password.
+	RecoveryKey
+	// APIKey enables the one to act on behalf of the user.
+	APIKey
+)
+
+// Key represents API key.
+type Key struct {
+	ID        string
+	Type      uint32
+	IssuerID  string
+	Subject   string
+	IssuedAt  time.Time
+	ExpiresAt time.Time
+}
+
+// Identity contains ID and Email.
+type Identity struct {
+	ID    string
+	Email string
+}
+
+// Expired verifies if the key is expired.
+func (k Key) Expired() bool {
+	if k.Type == APIKey && k.ExpiresAt.IsZero() {
+		return false
+	}
+	return k.ExpiresAt.UTC().Before(time.Now().UTC())
+}
+
+// KeyRepository specifies Key persistence API.
+type KeyRepository interface {
+	// Save persists the Key. A non-nil error is returned to indicate
+	// operation failure
+	Save(context.Context, Key) (string, error)
+
+	// Retrieve retrieves Key by its unique identifier.
+	Retrieve(context.Context, string, string) (Key, error)
+
+	// Remove removes Key with provided ID.
+	Remove(context.Context, string, string) error
+}
@@ -0,0 +1,60 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package auth_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestExpired(t *testing.T) {
+	exp := time.Now().Add(5 * time.Minute)
+	exp1 := time.Now()
+	cases := []struct {
+		desc    string
+		key     auth.Key
+		expired bool
+	}{
+		{
+			desc: "not expired key",
+			key: auth.Key{
+				IssuedAt:  time.Now(),
+				ExpiresAt: exp,
+			},
+			expired: false,
+		},
+		{
+			desc: "expired key",
+			key: auth.Key{
+				IssuedAt:  time.Now().UTC().Add(2 * time.Minute),
+				ExpiresAt: exp1,
+			},
+			expired: true,
+		},
+		{
+			desc: "user key with no expiration date",
+			key: auth.Key{
+				IssuedAt: time.Now(),
+			},
+			expired: true,
+		},
+		{
+			desc: "API key with no expiration date",
+			key: auth.Key{
+				IssuedAt: time.Now(),
+				Type:     auth.APIKey,
+			},
+			expired: false,
+		},
+	}
+
+	for _, tc := range cases {
+		res := tc.key.Expired()
+		assert.Equal(t, tc.expired, res, fmt.Sprintf("%s: expected %t got %t\n", tc.desc, tc.expired, res))
+	}
+}
@@ -0,0 +1,319 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+var _ auth.GroupRepository = (*groupRepositoryMock)(nil)
+
+type groupRepositoryMock struct {
+	mu sync.Mutex
+	// Map of groups, group id as a key.
+	// groups      map[GroupID]auth.Group
+	groups map[string]auth.Group
+	// Map of groups with group id as key that are
+	// children (i.e. has same parent id) is element
+	// in children's map where parent id is key.
+	// children    map[ParentID]map[GroupID]auth.Group
+	children map[string]map[string]auth.Group
+	// Map of parents' id with child group id as key.
+	// Each child has one parent.
+	// parents     map[ChildID]ParentID
+	parents map[string]string
+	// Map of groups (with group id as key) which
+	// represent memberships is element in
+	// memberships' map where member id is a key.
+	// memberships map[MemberID]map[GroupID]auth.Group
+	memberships map[string]map[string]auth.Group
+	// Map of group members where member id is a key
+	// is an element in the map members where group id is a key.
+	// members     map[type][GroupID]map[MemberID]MemberID
+	members map[string]map[string]map[string]string
+}
+
+// NewGroupRepository creates in-memory user repository
+func NewGroupRepository() auth.GroupRepository {
+	return &groupRepositoryMock{
+		groups:      make(map[string]auth.Group),
+		children:    make(map[string]map[string]auth.Group),
+		parents:     make(map[string]string),
+		memberships: make(map[string]map[string]auth.Group),
+		members:     make(map[string]map[string]map[string]string),
+	}
+}
+
+func (grm *groupRepositoryMock) Save(ctx context.Context, group auth.Group) (auth.Group, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	if _, ok := grm.groups[group.ID]; ok {
+		return auth.Group{}, errors.ErrConflict
+	}
+	path := group.ID
+
+	if group.ParentID != "" {
+		parent, ok := grm.groups[group.ParentID]
+		if !ok {
+			return auth.Group{}, errors.ErrCreateEntity
+		}
+		if _, ok := grm.children[group.ParentID]; !ok {
+			grm.children[group.ParentID] = make(map[string]auth.Group)
+		}
+		grm.children[group.ParentID][group.ID] = group
+		grm.parents[group.ID] = group.ParentID
+		path = fmt.Sprintf("%s.%s", parent.Path, path)
+	}
+
+	group.Path = path
+	group.Level = len(strings.Split(path, "."))
+
+	grm.groups[group.ID] = group
+	return group, nil
+}
+
+func (grm *groupRepositoryMock) Update(ctx context.Context, group auth.Group) (auth.Group, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	up, ok := grm.groups[group.ID]
+	if !ok {
+		return auth.Group{}, errors.ErrNotFound
+	}
+	up.Name = group.Name
+	up.Description = group.Description
+	up.Metadata = group.Metadata
+	up.UpdatedAt = time.Now()
+
+	grm.groups[group.ID] = up
+	return up, nil
+}
+
+func (grm *groupRepositoryMock) Delete(ctx context.Context, id string) error {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	if _, ok := grm.groups[id]; !ok {
+		return errors.ErrNotFound
+	}
+
+	if len(grm.members[id]) > 0 {
+		return auth.ErrGroupNotEmpty
+	}
+
+	// This is not quite exact, it should go in depth
+	for _, ch := range grm.children[id] {
+		if len(grm.members[ch.ID]) > 0 {
+			return auth.ErrGroupNotEmpty
+		}
+	}
+
+	// This is not quite exact, it should go in depth
+	delete(grm.groups, id)
+	for _, ch := range grm.children[id] {
+		delete(grm.members, ch.ID)
+	}
+
+	delete(grm.children, id)
+
+	return nil
+
+}
+
+func (grm *groupRepositoryMock) RetrieveByID(ctx context.Context, id string) (auth.Group, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+
+	val, ok := grm.groups[id]
+	if !ok {
+		return auth.Group{}, errors.ErrNotFound
+	}
+	return val, nil
+}
+
+func (grm *groupRepositoryMock) RetrieveAll(ctx context.Context, pm auth.PageMetadata) (auth.GroupPage, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	var items []auth.Group
+	for _, g := range grm.groups {
+		items = append(items, g)
+	}
+	return auth.GroupPage{
+		Groups: items,
+		PageMetadata: auth.PageMetadata{
+			Total: uint64(len(items)),
+		},
+	}, nil
+}
+
+func (grm *groupRepositoryMock) Unassign(ctx context.Context, groupID string, memberIDs ...string) error {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	if _, ok := grm.groups[groupID]; !ok {
+		return errors.ErrNotFound
+	}
+	for _, memberID := range memberIDs {
+		for typ, m := range grm.members[groupID] {
+			_, ok := m[memberID]
+			if !ok {
+				return errors.ErrNotFound
+			}
+			delete(grm.members[groupID][typ], memberID)
+			delete(grm.memberships[memberID], groupID)
+		}
+
+	}
+	return nil
+}
+
+func (grm *groupRepositoryMock) Assign(ctx context.Context, groupID, groupType string, memberIDs ...string) error {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	if _, ok := grm.groups[groupID]; !ok {
+		return errors.ErrNotFound
+	}
+
+	if _, ok := grm.members[groupID]; !ok {
+		grm.members[groupID] = make(map[string]map[string]string)
+	}
+
+	for _, memberID := range memberIDs {
+		if _, ok := grm.members[groupID][groupType]; !ok {
+			grm.members[groupID][groupType] = make(map[string]string)
+		}
+		if _, ok := grm.memberships[memberID]; !ok {
+			grm.memberships[memberID] = make(map[string]auth.Group)
+		}
+
+		grm.members[groupID][groupType][memberID] = memberID
+		grm.memberships[memberID][groupID] = grm.groups[groupID]
+	}
+	return nil
+
+}
+
+func (grm *groupRepositoryMock) Memberships(ctx context.Context, memberID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	var items []auth.Group
+
+	first := uint64(pm.Offset)
+	last := first + uint64(pm.Limit)
+
+	i := uint64(0)
+	for _, g := range grm.memberships[memberID] {
+		if i >= first && i < last {
+			items = append(items, g)
+		}
+		i++
+	}
+
+	return auth.GroupPage{
+		Groups: items,
+		PageMetadata: auth.PageMetadata{
+			Limit:  pm.Limit,
+			Offset: pm.Offset,
+			Total:  uint64(len(items)),
+		},
+	}, nil
+}
+
+func (grm *groupRepositoryMock) Members(ctx context.Context, groupID, groupType string, pm auth.PageMetadata) (auth.MemberPage, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	var items []auth.Member
+	members, ok := grm.members[groupID][groupType]
+	if !ok {
+		return auth.MemberPage{}, errors.ErrNotFound
+	}
+
+	first := uint64(pm.Offset)
+	last := first + uint64(pm.Limit)
+
+	i := uint64(0)
+	for _, g := range members {
+		if i >= first && i < last {
+			items = append(items, auth.Member{ID: g, Type: groupType})
+		}
+		i++
+	}
+	return auth.MemberPage{
+		Members: items,
+		PageMetadata: auth.PageMetadata{
+			Total: uint64(len(items)),
+		},
+	}, nil
+}
+
+func (grm *groupRepositoryMock) RetrieveAllParents(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	if groupID == "" {
+		return auth.GroupPage{}, nil
+	}
+
+	group, ok := grm.groups[groupID]
+	if !ok {
+		return auth.GroupPage{}, errors.ErrNotFound
+	}
+
+	groups := make([]auth.Group, 0)
+	groups, err := grm.getParents(groups, group)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+
+	return auth.GroupPage{
+		Groups: groups,
+		PageMetadata: auth.PageMetadata{
+			Total: uint64(len(groups)),
+		},
+	}, nil
+}
+
+func (grm *groupRepositoryMock) getParents(groups []auth.Group, group auth.Group) ([]auth.Group, error) {
+	groups = append(groups, group)
+	parentID, ok := grm.parents[group.ID]
+	if !ok && parentID == "" {
+		return groups, nil
+	}
+	parent, ok := grm.groups[parentID]
+	if !ok {
+		panic(fmt.Sprintf("parent with id: %s not found", parentID))
+	}
+	return grm.getParents(groups, parent)
+}
+
+func (grm *groupRepositoryMock) RetrieveAllChildren(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	grm.mu.Lock()
+	defer grm.mu.Unlock()
+	group, ok := grm.groups[groupID]
+	if !ok {
+		return auth.GroupPage{}, nil
+	}
+
+	groups := make([]auth.Group, 0)
+	groups = append(groups, group)
+	for ch := range grm.parents {
+		g, ok := grm.groups[ch]
+		if !ok {
+			panic(fmt.Sprintf("child with id %s not found", ch))
+		}
+		groups = append(groups, g)
+	}
+
+	return auth.GroupPage{
+		Groups: groups,
+		PageMetadata: auth.PageMetadata{
+			Total:  uint64(len(groups)),
+			Offset: pm.Offset,
+			Limit:  pm.Limit,
+		},
+	}, nil
+}
@@ -0,0 +1,56 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"context"
+	"sync"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+var _ auth.KeyRepository = (*keyRepositoryMock)(nil)
+
+type keyRepositoryMock struct {
+	mu   sync.Mutex
+	keys map[string]auth.Key
+}
+
+// NewKeyRepository creates in-memory user repository
+func NewKeyRepository() auth.KeyRepository {
+	return &keyRepositoryMock{
+		keys: make(map[string]auth.Key),
+	}
+}
+
+func (krm *keyRepositoryMock) Save(ctx context.Context, key auth.Key) (string, error) {
+	krm.mu.Lock()
+	defer krm.mu.Unlock()
+
+	if _, ok := krm.keys[key.ID]; ok {
+		return "", errors.ErrConflict
+	}
+
+	krm.keys[key.ID] = key
+	return key.ID, nil
+}
+func (krm *keyRepositoryMock) Retrieve(ctx context.Context, issuerID, id string) (auth.Key, error) {
+	krm.mu.Lock()
+	defer krm.mu.Unlock()
+
+	if key, ok := krm.keys[id]; ok && key.IssuerID == issuerID {
+		return key, nil
+	}
+
+	return auth.Key{}, errors.ErrNotFound
+}
+func (krm *keyRepositoryMock) Remove(ctx context.Context, issuerID, id string) error {
+	krm.mu.Lock()
+	defer krm.mu.Unlock()
+	if key, ok := krm.keys[id]; ok && key.IssuerID == issuerID {
+		delete(krm.keys, id)
+	}
+	return nil
+}
@@ -0,0 +1,78 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"context"
+	"sync"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+	acl "github.com/ory/keto/proto/ory/keto/acl/v1alpha1"
+)
+
+type MockSubjectSet struct {
+	Object   string
+	Relation string
+}
+
+type policyAgentMock struct {
+	mu sync.Mutex
+	// authzDb stores 'subject' as a key, and subject policies as a value.
+	authzDB map[string][]MockSubjectSet
+}
+
+// NewKetoMock returns a mock service for Keto.
+// This mock is not implemented yet.
+func NewKetoMock(db map[string][]MockSubjectSet) auth.PolicyAgent {
+	return &policyAgentMock{authzDB: db}
+}
+
+func (pa *policyAgentMock) CheckPolicy(ctx context.Context, pr auth.PolicyReq) error {
+	pa.mu.Lock()
+	defer pa.mu.Unlock()
+
+	ssList := pa.authzDB[pr.Subject]
+	for _, ss := range ssList {
+		if ss.Object == pr.Object && ss.Relation == pr.Relation {
+			return nil
+		}
+	}
+	return errors.ErrAuthorization
+}
+
+func (pa *policyAgentMock) AddPolicy(ctx context.Context, pr auth.PolicyReq) error {
+	pa.mu.Lock()
+	defer pa.mu.Unlock()
+
+	pa.authzDB[pr.Subject] = append(pa.authzDB[pr.Subject], MockSubjectSet{Object: pr.Object, Relation: pr.Relation})
+	return nil
+}
+
+func (pa *policyAgentMock) DeletePolicy(ctx context.Context, pr auth.PolicyReq) error {
+	pa.mu.Lock()
+	defer pa.mu.Unlock()
+
+	ssList := pa.authzDB[pr.Subject]
+	for k, ss := range ssList {
+		if ss.Object == pr.Object && ss.Relation == pr.Relation {
+			ssList[k] = MockSubjectSet{}
+		}
+	}
+	return nil
+}
+
+func (pa *policyAgentMock) RetrievePolicies(ctx context.Context, pr auth.PolicyReq) ([]*acl.RelationTuple, error) {
+	pa.mu.Lock()
+	defer pa.mu.Unlock()
+
+	ssList := pa.authzDB[pr.Subject]
+	tuple := []*acl.RelationTuple{}
+	for _, ss := range ssList {
+		if ss.Relation == pr.Relation {
+			tuple = append(tuple, &acl.RelationTuple{Object: ss.Object, Relation: ss.Relation})
+		}
+	}
+	return tuple, nil
+}
@@ -0,0 +1,72 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package auth
+
+import (
+	"context"
+
+	acl "github.com/ory/keto/proto/ory/keto/acl/v1alpha1"
+)
+
+// PolicyReq represents an argument struct for making a policy related
+// function calls.
+type PolicyReq struct {
+	Subject  string
+	Object   string
+	Relation string
+}
+
+type PolicyPage struct {
+	Policies []string
+}
+
+// Authz represents a authorization service. It exposes
+// functionalities through `auth` to perform authorization.
+type Authz interface {
+	// Authorize checks authorization of the given `subject`. Basically,
+	// Authorize verifies that Is `subject` allowed to `relation` on
+	// `object`. Authorize returns a non-nil error if the subject has
+	// no relation on the object (which simply means the operation is
+	// denied).
+	Authorize(ctx context.Context, pr PolicyReq) error
+
+	// AddPolicy creates a policy for the given subject, so that, after
+	// AddPolicy, `subject` has a `relation` on `object`. Returns a non-nil
+	// error in case of failures.
+	AddPolicy(ctx context.Context, pr PolicyReq) error
+
+	// AddPolicies adds new policies for given subjects. This method is
+	// only allowed to use as an admin.
+	AddPolicies(ctx context.Context, token, object string, subjectIDs, relations []string) error
+
+	// DeletePolicy removes a policy.
+	DeletePolicy(ctx context.Context, pr PolicyReq) error
+
+	// DeletePolicies deletes policies for given subjects. This method is
+	// only allowed to use as an admin.
+	DeletePolicies(ctx context.Context, token, object string, subjectIDs, relations []string) error
+
+	// ListPolicies lists policies based on the given PolicyReq structure.
+	ListPolicies(ctx context.Context, pr PolicyReq) (PolicyPage, error)
+}
+
+// PolicyAgent facilitates the communication to authorization
+// services and implements Authz functionalities for certain
+// authorization services (e.g. ORY Keto).
+type PolicyAgent interface {
+	// CheckPolicy checks if the subject has a relation on the object.
+	// It returns a non-nil error if the subject has no relation on
+	// the object (which simply means the operation is denied).
+	CheckPolicy(ctx context.Context, pr PolicyReq) error
+
+	// AddPolicy creates a policy for the given subject, so that, after
+	// AddPolicy, `subject` has a `relation` on `object`. Returns a non-nil
+	// error in case of failures.
+	AddPolicy(ctx context.Context, pr PolicyReq) error
+
+	// DeletePolicy removes a policy.
+	DeletePolicy(ctx context.Context, pr PolicyReq) error
+
+	RetrievePolicies(ctx context.Context, pr PolicyReq) ([]*acl.RelationTuple, error)
+}
@@ -0,0 +1,6 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package postgres contains Key repository implementations using
+// PostgreSQL as the underlying database.
+package postgres
@@ -0,0 +1,742 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/gofrs/uuid"
+	"github.com/jmoiron/sqlx"
+
+	"github.com/lib/pq"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+var (
+	errStringToUUID        = errors.New("error converting string to uuid")
+	errGetTotal            = errors.New("failed to get total number of groups")
+	errCreateMetadataQuery = errors.New("failed to create query for metadata")
+
+	errTruncation = "string_data_right_truncation"
+	errFK         = "foreign_key_violation"
+	groupIDFkeyy  = "group_relations_group_id_fkey"
+)
+
+var _ auth.GroupRepository = (*groupRepository)(nil)
+
+type groupRepository struct {
+	db Database
+}
+
+// NewGroupRepo instantiates a PostgreSQL implementation of group
+// repository.
+func NewGroupRepo(db Database) auth.GroupRepository {
+	return &groupRepository{
+		db: db,
+	}
+}
+
+func (gr groupRepository) Save(ctx context.Context, g auth.Group) (auth.Group, error) {
+	// For root group path is initialized with id
+	q := `INSERT INTO groups (name, description, id, path, owner_id, metadata, created_at, updated_at)
+		  VALUES (:name, :description, :id, :id, :owner_id, :metadata, :created_at, :updated_at)
+		  RETURNING id, name, owner_id, parent_id, description, metadata, path, nlevel(path) as level, created_at, updated_at`
+	if g.ParentID != "" {
+		// Path is constructed in insert_group_tr - init.go
+		q = `INSERT INTO groups (name, description, id, owner_id, parent_id, metadata, created_at, updated_at)
+			 VALUES ( :name, :description, :id, :owner_id, :parent_id, :metadata, :created_at, :updated_at)
+			 RETURNING id, name, owner_id, parent_id, description, metadata, path, nlevel(path) as level, created_at, updated_at`
+	}
+
+	dbg, err := toDBGroup(g)
+	if err != nil {
+		return auth.Group{}, err
+	}
+
+	row, err := gr.db.NamedQueryContext(ctx, q, dbg)
+	if err != nil {
+		pqErr, ok := err.(*pq.Error)
+		if ok {
+			switch pqErr.Code.Name() {
+			case errInvalid, errTruncation:
+				return auth.Group{}, errors.Wrap(errors.ErrMalformedEntity, err)
+			case errFK:
+				return auth.Group{}, errors.Wrap(errors.ErrCreateEntity, err)
+			case errDuplicate:
+				return auth.Group{}, errors.Wrap(errors.ErrConflict, err)
+			}
+		}
+
+		return auth.Group{}, errors.Wrap(errors.ErrCreateEntity, errors.New(pqErr.Message))
+	}
+
+	defer row.Close()
+	row.Next()
+	dbg = dbGroup{}
+	if err := row.StructScan(&dbg); err != nil {
+		return auth.Group{}, err
+	}
+
+	return toGroup(dbg)
+}
+
+func (gr groupRepository) Update(ctx context.Context, g auth.Group) (auth.Group, error) {
+	q := `UPDATE groups SET name = :name, description = :description, metadata = :metadata, updated_at = :updated_at WHERE id = :id
+		  RETURNING id, name, owner_id, parent_id, description, metadata, path, nlevel(path) as level, created_at, updated_at`
+
+	dbu, err := toDBGroup(g)
+	if err != nil {
+		return auth.Group{}, errors.Wrap(errors.ErrUpdateEntity, err)
+	}
+
+	row, err := gr.db.NamedQueryContext(ctx, q, dbu)
+	if err != nil {
+		pqErr, ok := err.(*pq.Error)
+		if ok {
+			switch pqErr.Code.Name() {
+			case errInvalid, errTruncation:
+				return auth.Group{}, errors.Wrap(errors.ErrMalformedEntity, err)
+			case errDuplicate:
+				return auth.Group{}, errors.Wrap(errors.ErrConflict, err)
+			}
+		}
+		return auth.Group{}, errors.Wrap(errors.ErrUpdateEntity, errors.New(pqErr.Message))
+	}
+
+	defer row.Close()
+	row.Next()
+	dbu = dbGroup{}
+	if err := row.StructScan(&dbu); err != nil {
+		return g, errors.Wrap(errors.ErrUpdateEntity, err)
+	}
+
+	return toGroup(dbu)
+}
+
+func (gr groupRepository) Delete(ctx context.Context, groupID string) error {
+	qd := `DELETE FROM groups WHERE id = :id`
+	group := auth.Group{
+		ID: groupID,
+	}
+	dbg, err := toDBGroup(group)
+	if err != nil {
+		return errors.Wrap(errors.ErrUpdateEntity, err)
+	}
+
+	res, err := gr.db.NamedExecContext(ctx, qd, dbg)
+	if err != nil {
+		pqErr, ok := err.(*pq.Error)
+		if ok {
+			switch pqErr.Code.Name() {
+			case errInvalid, errTruncation:
+				return errors.Wrap(errors.ErrMalformedEntity, err)
+			case errFK:
+				switch pqErr.Constraint {
+				case groupIDFkeyy:
+					return errors.Wrap(auth.ErrGroupNotEmpty, err)
+				}
+				return errors.Wrap(errors.ErrConflict, err)
+			}
+		}
+		return errors.Wrap(errors.ErrUpdateEntity, errors.New(pqErr.Message))
+	}
+
+	cnt, err := res.RowsAffected()
+	if err != nil {
+		return errors.Wrap(errors.ErrRemoveEntity, err)
+	}
+
+	if cnt != 1 {
+		return errors.Wrap(errors.ErrRemoveEntity, err)
+	}
+	return nil
+}
+
+func (gr groupRepository) RetrieveByID(ctx context.Context, id string) (auth.Group, error) {
+	dbu := dbGroup{
+		ID: id,
+	}
+	q := `SELECT id, name, owner_id, parent_id, description, metadata, path, nlevel(path) as level, created_at, updated_at FROM groups WHERE id = $1`
+	if err := gr.db.QueryRowxContext(ctx, q, id).StructScan(&dbu); err != nil {
+		if err == sql.ErrNoRows {
+			return auth.Group{}, errors.Wrap(errors.ErrNotFound, err)
+
+		}
+		return auth.Group{}, errors.Wrap(errors.ErrViewEntity, err)
+	}
+	return toGroup(dbu)
+}
+
+func (gr groupRepository) RetrieveAll(ctx context.Context, pm auth.PageMetadata) (auth.GroupPage, error) {
+	_, metaQuery, err := getGroupsMetadataQuery("groups", pm.Metadata)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveAll, err)
+	}
+
+	var mq string
+	if metaQuery != "" {
+		mq = fmt.Sprintf(" AND %s", metaQuery)
+	}
+
+	q := fmt.Sprintf(`SELECT id, owner_id, parent_id, name, description, metadata, path, nlevel(path) as level, created_at, updated_at FROM groups
+					  WHERE nlevel(path) <= :level %s ORDER BY path`, mq)
+
+	dbPage, err := toDBGroupPage("", "", pm)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveAll, err)
+	}
+
+	rows, err := gr.db.NamedQueryContext(ctx, q, dbPage)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveAll, err)
+	}
+	defer rows.Close()
+
+	items, err := gr.processRows(rows)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveAll, err)
+	}
+
+	cq := "SELECT COUNT(*) FROM groups"
+	if metaQuery != "" {
+		cq = fmt.Sprintf(" %s WHERE %s", cq, metaQuery)
+	}
+
+	total, err := total(ctx, gr.db, cq, dbPage)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveAll, err)
+	}
+
+	page := auth.GroupPage{
+		Groups: items,
+		PageMetadata: auth.PageMetadata{
+			Total: total,
+			Size:  uint64(len(items)),
+		},
+	}
+
+	return page, nil
+}
+
+func (gr groupRepository) RetrieveAllParents(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	q := `SELECT g.id, g.name, g.owner_id, g.parent_id, g.description, g.metadata, g.path, nlevel(g.path) as level, g.created_at, g.updated_at
+		  FROM groups parent, groups g
+	      WHERE parent.id = :id AND g.path @> parent.path AND nlevel(parent.path) - nlevel(g.path) <= :level`
+	cq := `SELECT COUNT(*) FROM groups parent, groups g WHERE parent.id = :id AND g.path @> parent.path`
+
+	gp, err := gr.retrieve(ctx, groupID, q, cq, pm)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveParents, err)
+	}
+	return gp, nil
+}
+
+func (gr groupRepository) RetrieveAllChildren(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	q := `SELECT g.id, g.name, g.owner_id, g.parent_id, g.description, g.metadata, g.path,  nlevel(g.path) as level, g.created_at, g.updated_at
+	FROM groups parent, groups g
+	WHERE parent.id = :id AND g.path <@ parent.path AND nlevel(g.path) - nlevel(parent.path) < :level`
+
+	cq := `SELECT COUNT(*) FROM groups parent, groups g WHERE parent.id = :id AND g.path <@ parent.path `
+	gp, err := gr.retrieve(ctx, groupID, q, cq, pm)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveChildren, err)
+	}
+	return gp, nil
+}
+
+func (gr groupRepository) retrieve(ctx context.Context, groupID, retQuery, cntQuery string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	if groupID == "" {
+		return auth.GroupPage{}, nil
+	}
+	_, mq, err := getGroupsMetadataQuery("g", pm.Metadata)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+	if mq != "" {
+		mq = fmt.Sprintf("AND %s", mq)
+	}
+
+	retQuery = fmt.Sprintf(`%s %s`, retQuery, mq)
+	cntQuery = fmt.Sprintf(`%s %s`, cntQuery, mq)
+
+	dbPage, err := toDBGroupPage(groupID, "", pm)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+
+	rows, err := gr.db.NamedQueryContext(ctx, retQuery, dbPage)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+	defer rows.Close()
+
+	items, err := gr.processRows(rows)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+
+	total, err := total(ctx, gr.db, cntQuery, dbPage)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+
+	page := auth.GroupPage{
+		Groups: items,
+		PageMetadata: auth.PageMetadata{
+			Level: pm.Level,
+			Total: total,
+			Size:  uint64(len(items)),
+		},
+	}
+
+	return page, nil
+
+}
+
+func (gr groupRepository) Members(ctx context.Context, groupID, groupType string, pm auth.PageMetadata) (auth.MemberPage, error) {
+	_, mq, err := getGroupsMetadataQuery("groups", pm.Metadata)
+	if err != nil {
+		return auth.MemberPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembers, err)
+	}
+
+	q := fmt.Sprintf(`SELECT gr.member_id, gr.group_id, gr.type, gr.created_at, gr.updated_at FROM group_relations gr
+					  WHERE gr.group_id = :group_id AND gr.type = :type %s`, mq)
+
+	if groupType == "" {
+		q = fmt.Sprintf(`SELECT gr.member_id, gr.group_id, gr.type, gr.created_at, gr.updated_at FROM group_relations gr
+		                 WHERE gr.group_id = :group_id %s`, mq)
+	}
+
+	params, err := toDBMemberPage("", groupID, groupType, pm)
+	if err != nil {
+		return auth.MemberPage{}, err
+	}
+
+	rows, err := gr.db.NamedQueryContext(ctx, q, params)
+	if err != nil {
+		return auth.MemberPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembers, err)
+	}
+	defer rows.Close()
+
+	var items []auth.Member
+	for rows.Next() {
+		member := dbMember{}
+		if err := rows.StructScan(&member); err != nil {
+			return auth.MemberPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembers, err)
+		}
+
+		if err != nil {
+			return auth.MemberPage{}, err
+		}
+
+		items = append(items, auth.Member{ID: member.MemberID, Type: member.Type})
+	}
+
+	cq := fmt.Sprintf(`SELECT COUNT(*) FROM groups g, group_relations gr
+					   WHERE gr.group_id = :group_id AND gr.group_id = g.id AND gr.type = :type %s;`, mq)
+
+	total, err := total(ctx, gr.db, cq, params)
+	if err != nil {
+		return auth.MemberPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembers, err)
+	}
+
+	page := auth.MemberPage{
+		Members: items,
+		PageMetadata: auth.PageMetadata{
+			Total:  total,
+			Offset: pm.Offset,
+			Limit:  pm.Limit,
+			Size:   uint64(len(items)),
+		},
+	}
+
+	return page, nil
+}
+
+func (gr groupRepository) Memberships(ctx context.Context, memberID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	_, mq, err := getGroupsMetadataQuery("groups", pm.Metadata)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembership, err)
+	}
+
+	if mq != "" {
+		mq = fmt.Sprintf("AND %s", mq)
+	}
+	q := fmt.Sprintf(`SELECT g.id, g.owner_id, g.parent_id, g.name, g.description, g.metadata
+					  FROM group_relations gr, groups g
+					  WHERE gr.group_id = g.id and gr.member_id = :member_id
+		  			  %s ORDER BY id LIMIT :limit OFFSET :offset;`, mq)
+
+	params, err := toDBMemberPage(memberID, "", "", pm)
+	if err != nil {
+		return auth.GroupPage{}, err
+	}
+
+	rows, err := gr.db.NamedQueryContext(ctx, q, params)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembership, err)
+	}
+	defer rows.Close()
+
+	var items []auth.Group
+	for rows.Next() {
+		dbg := dbGroup{}
+		if err := rows.StructScan(&dbg); err != nil {
+			return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembership, err)
+		}
+		gr, err := toGroup(dbg)
+		if err != nil {
+			return auth.GroupPage{}, err
+		}
+		items = append(items, gr)
+	}
+
+	cq := fmt.Sprintf(`SELECT COUNT(*) FROM group_relations gr, groups g
+					   WHERE gr.group_id = g.id and gr.member_id = :member_id %s `, mq)
+
+	total, err := total(ctx, gr.db, cq, params)
+	if err != nil {
+		return auth.GroupPage{}, errors.Wrap(auth.ErrFailedToRetrieveMembership, err)
+	}
+
+	page := auth.GroupPage{
+		Groups: items,
+		PageMetadata: auth.PageMetadata{
+			Total:  total,
+			Offset: pm.Offset,
+			Limit:  pm.Limit,
+			Size:   uint64(len(items)),
+		},
+	}
+
+	return page, nil
+}
+
+func (gr groupRepository) Assign(ctx context.Context, groupID, groupType string, ids ...string) error {
+	tx, err := gr.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return errors.Wrap(auth.ErrAssignToGroup, err)
+	}
+
+	qIns := `INSERT INTO group_relations (group_id, member_id, type, created_at, updated_at)
+			 VALUES(:group_id, :member_id, :type, :created_at, :updated_at)`
+
+	for _, id := range ids {
+		dbg, err := toDBGroupRelation(id, groupID, groupType)
+		if err != nil {
+			return errors.Wrap(auth.ErrAssignToGroup, err)
+		}
+		created := time.Now()
+		dbg.CreatedAt = created
+		dbg.UpdatedAt = created
+
+		if _, err := tx.NamedExecContext(ctx, qIns, dbg); err != nil {
+			tx.Rollback()
+			pqErr, ok := err.(*pq.Error)
+			if ok {
+				switch pqErr.Code.Name() {
+				case errInvalid, errTruncation:
+					return errors.Wrap(errors.ErrMalformedEntity, err)
+				case errFK:
+					return errors.Wrap(errors.ErrConflict, errors.New(pqErr.Detail))
+				case errDuplicate:
+					return errors.Wrap(auth.ErrMemberAlreadyAssigned, errors.New(pqErr.Detail))
+				}
+			}
+
+			return errors.Wrap(auth.ErrAssignToGroup, err)
+		}
+	}
+
+	if err = tx.Commit(); err != nil {
+		return errors.Wrap(auth.ErrAssignToGroup, err)
+	}
+
+	return nil
+}
+
+func (gr groupRepository) Unassign(ctx context.Context, groupID string, ids ...string) error {
+	tx, err := gr.db.BeginTxx(ctx, nil)
+	if err != nil {
+		return errors.Wrap(auth.ErrAssignToGroup, err)
+	}
+
+	qDel := `DELETE from group_relations WHERE group_id = :group_id AND member_id = :member_id`
+
+	for _, id := range ids {
+		dbg, err := toDBGroupRelation(id, groupID, "")
+		if err != nil {
+			return errors.Wrap(auth.ErrAssignToGroup, err)
+		}
+
+		if _, err := tx.NamedExecContext(ctx, qDel, dbg); err != nil {
+			tx.Rollback()
+			pqErr, ok := err.(*pq.Error)
+			if ok {
+				switch pqErr.Code.Name() {
+				case errInvalid, errTruncation:
+					return errors.Wrap(errors.ErrMalformedEntity, err)
+				case errDuplicate:
+					return errors.Wrap(errors.ErrConflict, err)
+				}
+			}
+
+			return errors.Wrap(auth.ErrAssignToGroup, err)
+		}
+	}
+
+	if err = tx.Commit(); err != nil {
+		return errors.Wrap(auth.ErrAssignToGroup, err)
+	}
+
+	return nil
+}
+
+type dbMember struct {
+	MemberID  string    `db:"member_id"`
+	GroupID   string    `db:"group_id"`
+	Type      string    `db:"type"`
+	CreatedAt time.Time `db:"created_at"`
+	UpdatedAt time.Time `db:"updated_at"`
+}
+
+type dbGroup struct {
+	ID          string         `db:"id"`
+	ParentID    sql.NullString `db:"parent_id"`
+	OwnerID     uuid.NullUUID  `db:"owner_id"`
+	Name        string         `db:"name"`
+	Description string         `db:"description"`
+	Metadata    dbMetadata     `db:"metadata"`
+	Level       int            `db:"level"`
+	Path        string         `db:"path"`
+	CreatedAt   time.Time      `db:"created_at"`
+	UpdatedAt   time.Time      `db:"updated_at"`
+}
+
+type dbGroupPage struct {
+	ID       string        `db:"id"`
+	ParentID string        `db:"parent_id"`
+	OwnerID  uuid.NullUUID `db:"owner_id"`
+	Metadata dbMetadata    `db:"metadata"`
+	Path     string        `db:"path"`
+	Level    uint64        `db:"level"`
+	Total    uint64        `db:"total"`
+	Limit    uint64        `db:"limit"`
+	Offset   uint64        `db:"offset"`
+}
+
+type dbMemberPage struct {
+	GroupID  string     `db:"group_id"`
+	MemberID string     `db:"member_id"`
+	Type     string     `db:"type"`
+	Metadata dbMetadata `db:"metadata"`
+	Limit    uint64     `db:"limit"`
+	Offset   uint64     `db:"offset"`
+	Size     uint64
+}
+
+func toUUID(id string) (uuid.NullUUID, error) {
+	var uid uuid.NullUUID
+	if id == "" {
+		return uuid.NullUUID{UUID: uuid.Nil, Valid: false}, nil
+	}
+	err := uid.Scan(id)
+	return uid, err
+}
+
+func toString(id uuid.NullUUID) (string, error) {
+	if id.Valid {
+		return id.UUID.String(), nil
+	}
+	if id.UUID == uuid.Nil {
+		return "", nil
+	}
+	return "", errStringToUUID
+}
+
+func toDBGroup(g auth.Group) (dbGroup, error) {
+	ownerID, err := toUUID(g.OwnerID)
+	if err != nil {
+		return dbGroup{}, err
+	}
+
+	var parentID sql.NullString
+	if g.ParentID != "" {
+		parentID = sql.NullString{String: g.ParentID, Valid: true}
+	}
+
+	meta := dbMetadata(g.Metadata)
+
+	return dbGroup{
+		ID:          g.ID,
+		Name:        g.Name,
+		ParentID:    parentID,
+		OwnerID:     ownerID,
+		Description: g.Description,
+		Metadata:    meta,
+		Path:        g.Path,
+		CreatedAt:   g.CreatedAt,
+		UpdatedAt:   g.UpdatedAt,
+	}, nil
+}
+
+func toDBGroupPage(id, path string, pm auth.PageMetadata) (dbGroupPage, error) {
+	level := auth.MaxLevel
+	if pm.Level < auth.MaxLevel {
+		level = pm.Level
+	}
+	return dbGroupPage{
+		Metadata: dbMetadata(pm.Metadata),
+		ID:       id,
+		Path:     path,
+		Level:    level,
+		Total:    pm.Total,
+		Offset:   pm.Offset,
+		Limit:    pm.Limit,
+	}, nil
+}
+
+func toDBMemberPage(memberID, groupID, groupType string, pm auth.PageMetadata) (dbMemberPage, error) {
+	return dbMemberPage{
+		GroupID:  groupID,
+		MemberID: memberID,
+		Type:     groupType,
+		Metadata: dbMetadata(pm.Metadata),
+		Offset:   pm.Offset,
+		Limit:    pm.Limit,
+	}, nil
+}
+
+func toGroup(dbu dbGroup) (auth.Group, error) {
+	ownerID, err := toString(dbu.OwnerID)
+	if err != nil {
+		return auth.Group{}, err
+	}
+
+	return auth.Group{
+		ID:          dbu.ID,
+		Name:        dbu.Name,
+		ParentID:    dbu.ParentID.String,
+		OwnerID:     ownerID,
+		Description: dbu.Description,
+		Metadata:    auth.GroupMetadata(dbu.Metadata),
+		Level:       dbu.Level,
+		Path:        dbu.Path,
+		UpdatedAt:   dbu.UpdatedAt,
+		CreatedAt:   dbu.CreatedAt,
+	}, nil
+}
+
+type dbGroupRelation struct {
+	GroupID   sql.NullString `db:"group_id"`
+	MemberID  sql.NullString `db:"member_id"`
+	CreatedAt time.Time      `db:"created_at"`
+	UpdatedAt time.Time      `db:"updated_at"`
+	Type      string         `db:"type"`
+}
+
+func toDBGroupRelation(memberID, groupID, groupType string) (dbGroupRelation, error) {
+	var grID sql.NullString
+	if groupID != "" {
+		grID = sql.NullString{String: groupID, Valid: true}
+	}
+
+	var mID sql.NullString
+	if memberID != "" {
+		mID = sql.NullString{String: memberID, Valid: true}
+	}
+
+	return dbGroupRelation{
+		GroupID:  grID,
+		MemberID: mID,
+		Type:     groupType,
+	}, nil
+}
+
+func getGroupsMetadataQuery(db string, m auth.GroupMetadata) (mb []byte, mq string, err error) {
+	if len(m) > 0 {
+		mq = `metadata @> :metadata`
+		if db != "" {
+			mq = db + "." + mq
+		}
+
+		b, err := json.Marshal(m)
+		if err != nil {
+			return nil, "", errors.Wrap(err, errCreateMetadataQuery)
+		}
+		mb = b
+	}
+	return mb, mq, nil
+}
+
+func (gr groupRepository) processRows(rows *sqlx.Rows) ([]auth.Group, error) {
+	var items []auth.Group
+	for rows.Next() {
+		dbg := dbGroup{}
+		if err := rows.StructScan(&dbg); err != nil {
+			return items, err
+		}
+		group, err := toGroup(dbg)
+		if err != nil {
+			return items, err
+		}
+		items = append(items, group)
+	}
+	return items, nil
+}
+
+func total(ctx context.Context, db Database, query string, params interface{}) (uint64, error) {
+	rows, err := db.NamedQueryContext(ctx, query, params)
+	if err != nil {
+		return 0, errors.Wrap(errGetTotal, err)
+	}
+	defer rows.Close()
+	total := uint64(0)
+	if rows.Next() {
+		if err := rows.Scan(&total); err != nil {
+			return 0, errors.Wrap(errGetTotal, err)
+		}
+	}
+	return total, nil
+}
+
+// dbMetadata type for handling metadata properly in database/sql
+type dbMetadata map[string]interface{}
+
+// Scan - Implement the database/sql scanner interface
+func (m *dbMetadata) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	b, ok := value.([]byte)
+	if !ok {
+		return errors.ErrScanMetadata
+	}
+
+	if err := json.Unmarshal(b, m); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Value Implements valuer
+func (m dbMetadata) Value() (driver.Value, error) {
+	if len(m) == 0 {
+		return nil, nil
+	}
+
+	b, err := json.Marshal(m)
+	if err != nil {
+		return nil, err
+	}
+	return b, err
+}
@@ -0,0 +1,777 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package postgres_test
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/auth/postgres"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	maxNameSize = 254
+	maxDescSize = 1024
+	groupName   = "Mainflux"
+	description = "description"
+)
+
+var (
+	invalidName = strings.Repeat("m", maxNameSize+1)
+	invalidDesc = strings.Repeat("m", maxDescSize+1)
+	metadata    = auth.GroupMetadata{
+		"admin": "true",
+	}
+)
+
+func generateGroupID(t *testing.T) string {
+	grpID, err := ulidProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	return grpID
+}
+
+func TestGroupSave(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	usrID, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	wrongID, err := ulidProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	grpID := generateGroupID(t)
+
+	cases := []struct {
+		desc  string
+		group auth.Group
+		err   error
+	}{
+		{
+			desc: "create new group",
+			group: auth.Group{
+				ID:      grpID,
+				OwnerID: usrID,
+				Name:    groupName,
+			},
+			err: nil,
+		},
+		{
+			desc: "create new group with existing name",
+			group: auth.Group{
+				ID:      grpID,
+				OwnerID: usrID,
+				Name:    groupName,
+			},
+			err: errors.ErrConflict,
+		},
+		{
+			desc: "create group with invalid name",
+			group: auth.Group{
+				ID:      generateGroupID(t),
+				OwnerID: usrID,
+				Name:    invalidName,
+			},
+			err: errors.ErrMalformedEntity,
+		},
+		{
+			desc: "create group with invalid description",
+			group: auth.Group{
+				ID:          generateGroupID(t),
+				OwnerID:     usrID,
+				Name:        groupName,
+				Description: invalidDesc,
+			},
+			err: errors.ErrMalformedEntity,
+		},
+		{
+			desc: "create group with parent",
+			group: auth.Group{
+				ID:       generateGroupID(t),
+				ParentID: grpID,
+				OwnerID:  usrID,
+				Name:     "withParent",
+			},
+			err: nil,
+		},
+		{
+			desc: "create group with parent and existing name",
+			group: auth.Group{
+				ID:       generateGroupID(t),
+				ParentID: grpID,
+				OwnerID:  usrID,
+				Name:     groupName,
+			},
+			err: nil,
+		},
+		{
+			desc: "create group with wrong parent",
+			group: auth.Group{
+				ID:       generateGroupID(t),
+				ParentID: wrongID,
+				OwnerID:  usrID,
+				Name:     "wrongParent",
+			},
+			err: errors.ErrCreateEntity,
+		},
+	}
+
+	for _, tc := range cases {
+		_, err := groupRepo.Save(context.Background(), tc.group)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+
+}
+
+func TestGroupRetrieveByID(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	require.Nil(t, err, fmt.Sprintf("group id unexpected error: %s", err))
+	group1 := auth.Group{
+		ID:      generateGroupID(t),
+		Name:    groupName + "TestGroupRetrieveByID1",
+		OwnerID: uid,
+	}
+
+	_, err = groupRepo.Save(context.Background(), group1)
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	retrieved, err := groupRepo.RetrieveByID(context.Background(), group1.ID)
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	assert.True(t, retrieved.ID == group1.ID, fmt.Sprintf("Save group, ID: expected %s got %s\n", group1.ID, retrieved.ID))
+
+	// Round to milliseconds as otherwise saving and retriving from DB
+	// adds rounding error.
+	creationTime := time.Now().UTC().Round(time.Millisecond)
+	group2 := auth.Group{
+		ID:          generateGroupID(t),
+		Name:        groupName + "TestGroupRetrieveByID",
+		OwnerID:     uid,
+		ParentID:    group1.ID,
+		CreatedAt:   creationTime,
+		UpdatedAt:   creationTime,
+		Description: description,
+		Metadata:    metadata,
+	}
+
+	_, err = groupRepo.Save(context.Background(), group2)
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	retrieved, err = groupRepo.RetrieveByID(context.Background(), group2.ID)
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	assert.True(t, retrieved.ID == group2.ID, fmt.Sprintf("Save group, ID: expected %s got %s\n", group2.ID, retrieved.ID))
+	assert.True(t, retrieved.CreatedAt.Equal(creationTime), fmt.Sprintf("Save group, CreatedAt: expected %s got %s\n", creationTime, retrieved.CreatedAt))
+	assert.True(t, retrieved.UpdatedAt.Equal(creationTime), fmt.Sprintf("Save group, UpdatedAt: expected %s got %s\n", creationTime, retrieved.UpdatedAt))
+	assert.True(t, retrieved.Level == 2, fmt.Sprintf("Save group, Level: expected %d got %d\n", retrieved.Level, 2))
+	assert.True(t, retrieved.ParentID == group1.ID, fmt.Sprintf("Save group, Level: expected %s got %s\n", group1.ID, retrieved.ParentID))
+	assert.True(t, retrieved.Description == description, fmt.Sprintf("Save group, Description: expected %v got %v\n", retrieved.Description, description))
+	assert.True(t, retrieved.Path == fmt.Sprintf("%s.%s", group1.ID, group2.ID), fmt.Sprintf("Save group, Path: expected %s got %s\n", fmt.Sprintf("%s.%s", group1.ID, group2.ID), retrieved.Path))
+
+	retrieved, err = groupRepo.RetrieveByID(context.Background(), generateGroupID(t))
+	assert.True(t, errors.Contains(err, errors.ErrNotFound), fmt.Sprintf("Retrieve group: expected %s got %s\n", errors.ErrNotFound, err))
+}
+
+func TestGroupUpdate(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	creationTime := time.Now().UTC()
+	updateTime := time.Now().UTC()
+	groupID := generateGroupID(t)
+
+	group := auth.Group{
+		ID:          groupID,
+		Name:        groupName + "TestGroupUpdate",
+		OwnerID:     uid,
+		CreatedAt:   creationTime,
+		UpdatedAt:   creationTime,
+		Description: description,
+		Metadata:    metadata,
+	}
+
+	_, err = groupRepo.Save(context.Background(), group)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	retrieved, err := groupRepo.RetrieveByID(context.Background(), group.ID)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	cases := []struct {
+		desc          string
+		groupUpdate   auth.Group
+		groupExpected auth.Group
+		err           error
+	}{
+		{
+			desc: "update group for existing id",
+			groupUpdate: auth.Group{
+				ID:        groupID,
+				Name:      groupName + "Updated",
+				UpdatedAt: updateTime,
+				Metadata:  auth.GroupMetadata{"admin": "false"},
+			},
+			groupExpected: auth.Group{
+				Name:      groupName + "Updated",
+				UpdatedAt: updateTime,
+				Metadata:  auth.GroupMetadata{"admin": "false"},
+				CreatedAt: retrieved.CreatedAt,
+				Path:      retrieved.Path,
+				ParentID:  retrieved.ParentID,
+				ID:        retrieved.ID,
+				Level:     retrieved.Level,
+			},
+			err: nil,
+		},
+		{
+			desc: "update group for non-existing id",
+			groupUpdate: auth.Group{
+				ID:   "wrong",
+				Name: groupName + "-2",
+			},
+			err: errors.ErrUpdateEntity,
+		},
+		{
+			desc: "update group for invalid name",
+			groupUpdate: auth.Group{
+				ID:   groupID,
+				Name: invalidName,
+			},
+			err: errors.ErrMalformedEntity,
+		},
+		{
+			desc: "update group for invalid description",
+			groupUpdate: auth.Group{
+				ID:          groupID,
+				Description: invalidDesc,
+			},
+			err: errors.ErrMalformedEntity,
+		},
+	}
+
+	for _, tc := range cases {
+		updated, err := groupRepo.Update(context.Background(), tc.groupUpdate)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+		if tc.desc == "update group for existing id" {
+			assert.True(t, updated.Level == tc.groupExpected.Level, fmt.Sprintf("%s:Level: expected %d got %d\n", tc.desc, tc.groupExpected.Level, updated.Level))
+			assert.True(t, updated.Name == tc.groupExpected.Name, fmt.Sprintf("%s:Name: expected %s got %s\n", tc.desc, tc.groupExpected.Name, updated.Name))
+			assert.True(t, updated.Metadata["admin"] == tc.groupExpected.Metadata["admin"], fmt.Sprintf("%s:Level: expected %d got %d\n", tc.desc, tc.groupExpected.Metadata["admin"], updated.Metadata["admin"]))
+		}
+	}
+}
+
+func TestGroupDelete(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	creationTime := time.Now().UTC()
+	groupParent := auth.Group{
+		ID:        generateGroupID(t),
+		Name:      groupName + "Updated",
+		OwnerID:   uid,
+		CreatedAt: creationTime,
+		UpdatedAt: creationTime,
+	}
+
+	groupParent, err = groupRepo.Save(context.Background(), groupParent)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	creationTime = time.Now().UTC()
+	groupChild1 := auth.Group{
+		ID:        generateGroupID(t),
+		ParentID:  groupParent.ID,
+		Name:      groupName + "child1",
+		OwnerID:   uid,
+		CreatedAt: creationTime,
+		UpdatedAt: creationTime,
+	}
+
+	creationTime = time.Now().UTC()
+	groupChild2 := auth.Group{
+		ID:        generateGroupID(t),
+		ParentID:  groupParent.ID,
+		Name:      groupName + "child2",
+		OwnerID:   uid,
+		CreatedAt: creationTime,
+		UpdatedAt: creationTime,
+	}
+
+	meta := auth.PageMetadata{
+		Level: auth.MaxLevel,
+	}
+
+	groupChild1, err = groupRepo.Save(context.Background(), groupChild1)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	groupChild2, err = groupRepo.Save(context.Background(), groupChild2)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	gp, err := groupRepo.RetrieveAllChildren(context.Background(), groupParent.ID, meta)
+	assert.True(t, errors.Contains(err, nil), fmt.Sprintf("Retrieve children for parent: expected %v got %v\n", nil, err))
+	assert.True(t, gp.Total == 3, fmt.Sprintf("Number of children + parent: expected %d got %d\n", 3, gp.Total))
+
+	thingID, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("thing id create unexpected error: %s", err))
+
+	err = groupRepo.Assign(context.Background(), groupChild1.ID, "things", thingID)
+	require.Nil(t, err, fmt.Sprintf("thing assign got unexpected error: %s", err))
+
+	err = groupRepo.Delete(context.Background(), groupChild1.ID)
+	assert.True(t, errors.Contains(err, auth.ErrGroupNotEmpty), fmt.Sprintf("delete non empty group: expected %v got %v\n", auth.ErrGroupNotEmpty, err))
+
+	err = groupRepo.Delete(context.Background(), groupChild2.ID)
+	assert.True(t, errors.Contains(err, nil), fmt.Sprintf("delete empty group: expected %v got %v\n", nil, err))
+
+	err = groupRepo.Delete(context.Background(), groupParent.ID)
+	assert.True(t, errors.Contains(err, auth.ErrGroupNotEmpty), fmt.Sprintf("delete parent with children with members: expected %v got %v\n", auth.ErrGroupNotEmpty, err))
+
+	gp, err = groupRepo.RetrieveAllChildren(context.Background(), groupParent.ID, meta)
+	assert.True(t, errors.Contains(err, nil), fmt.Sprintf("retrieve children after one child removed: expected %v got %v\n", nil, err))
+	assert.True(t, gp.Total == 2, fmt.Sprintf("number of children + parent: expected %d got %d\n", 2, gp.Total))
+
+	err = groupRepo.Unassign(context.Background(), groupChild1.ID, thingID)
+	require.Nil(t, err, fmt.Sprintf("failed to remove thing from a group error: %s", err))
+
+	err = groupRepo.Delete(context.Background(), groupParent.ID)
+	assert.True(t, errors.Contains(err, nil), fmt.Sprintf("delete parent with children with no members: expected %v got %v\n", nil, err))
+
+	_, err = groupRepo.RetrieveByID(context.Background(), groupChild1.ID)
+	assert.True(t, errors.Contains(err, errors.ErrNotFound), fmt.Sprintf("retrieve child after parent removed: expected %v got %v\n", nil, err))
+}
+
+func TestRetrieveAll(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	metadata := auth.PageMetadata{
+		Metadata: auth.GroupMetadata{
+			"field": "value",
+		},
+		Level: auth.MaxLevel,
+	}
+	wrongMeta := auth.PageMetadata{
+		Metadata: auth.GroupMetadata{
+			"wrong": "wrong",
+		},
+		Level: auth.MaxLevel,
+	}
+
+	metaNum := uint64(3)
+
+	n := uint64(auth.MaxLevel)
+	parentID := ""
+	for i := uint64(0); i < n; i++ {
+		creationTime := time.Now().UTC()
+		group := auth.Group{
+			ID:        generateGroupID(t),
+			Name:      fmt.Sprintf("%s-%d", groupName, i),
+			OwnerID:   uid,
+			ParentID:  parentID,
+			CreatedAt: creationTime,
+			UpdatedAt: creationTime,
+		}
+		// Create Groups with metadata.
+		if i < metaNum {
+			group.Metadata = metadata.Metadata
+		}
+
+		_, err = groupRepo.Save(context.Background(), group)
+		require.Nil(t, err, fmt.Sprintf("unexpected error: %s\n", err))
+		parentID = group.ID
+	}
+
+	cases := map[string]struct {
+		Size     uint64
+		Metadata auth.PageMetadata
+	}{
+		"retrieve all groups": {
+			Metadata: auth.PageMetadata{
+				Total: n,
+				Limit: n,
+				Level: auth.MaxLevel,
+			},
+			Size: n,
+		},
+		"retrieve groups with existing metadata": {
+			Metadata: auth.PageMetadata{
+				Total:    metaNum,
+				Limit:    n,
+				Level:    auth.MaxLevel,
+				Metadata: metadata.Metadata,
+			},
+			Size: metaNum,
+		},
+		"retrieve groups with non-existing metadata": {
+			Metadata: auth.PageMetadata{
+				Total:    uint64(0),
+				Limit:    n,
+				Level:    auth.MaxLevel,
+				Metadata: wrongMeta.Metadata,
+			},
+			Size: uint64(0),
+		},
+		"retrieve groups with hierarchy level depth": {
+			Metadata: auth.PageMetadata{
+				Total:    uint64(metaNum),
+				Limit:    n,
+				Level:    auth.MaxLevel,
+				Metadata: metadata.Metadata,
+			},
+			Size: uint64(metaNum),
+		},
+		"retrieve groups with hierarchy level depth and existing metadata": {
+			Metadata: auth.PageMetadata{
+				Total:    uint64(metaNum),
+				Limit:    n,
+				Level:    auth.MaxLevel,
+				Metadata: metadata.Metadata,
+			},
+			Size: uint64(metaNum),
+		},
+	}
+
+	for desc, tc := range cases {
+		page, err := groupRepo.RetrieveAll(context.Background(), tc.Metadata)
+		size := len(page.Groups)
+		assert.Equal(t, tc.Size, uint64(size), fmt.Sprintf("%s: expected size %d got %d\n", desc, tc.Size, size))
+		assert.Equal(t, tc.Metadata.Total, page.Total, fmt.Sprintf("%s: expected total %d got %d\n", desc, tc.Metadata.Total, page.Total))
+		assert.Nil(t, err, fmt.Sprintf("%s: expected no error got %d\n", desc, err))
+	}
+}
+
+func TestRetrieveAllParents(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	metadata := auth.GroupMetadata{
+		"field": "value",
+	}
+	wrongMeta := auth.GroupMetadata{
+		"wrong": "wrong",
+	}
+
+	p, err := groupRepo.RetrieveAll(context.Background(), auth.PageMetadata{Level: auth.MaxLevel})
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	assert.Equal(t, uint64(0), p.Total, fmt.Sprintf("expected total %d got %d\n", 0, p.Total))
+
+	metaNum := uint64(3)
+
+	n := uint64(10)
+	parentID := ""
+	parentMiddle := ""
+	for i := uint64(0); i < n; i++ {
+		creationTime := time.Now().UTC()
+		group := auth.Group{
+			ID:        generateGroupID(t),
+			Name:      fmt.Sprintf("%s-%d", groupName, i),
+			OwnerID:   uid,
+			ParentID:  parentID,
+			CreatedAt: creationTime,
+			UpdatedAt: creationTime,
+		}
+		// Create Groups with metadata.
+		if n-i <= metaNum {
+			group.Metadata = metadata
+		}
+		if i == n/2 {
+			parentMiddle = group.ID
+		}
+		_, err = groupRepo.Save(context.Background(), group)
+		require.Nil(t, err, fmt.Sprintf("unexpected error: %s\n", err))
+		parentID = group.ID
+	}
+
+	cases := map[string]struct {
+		level    uint64
+		parentID string
+		Size     uint64
+		Total    uint64
+		Metadata auth.GroupMetadata
+	}{
+		"retrieve all parents": {
+			Total:    n,
+			Size:     auth.MaxLevel + 1,
+			level:    auth.MaxLevel,
+			parentID: parentID,
+		},
+		"retrieve groups with existing metadata": {
+			Total:    metaNum,
+			Size:     metaNum,
+			Metadata: metadata,
+			parentID: parentID,
+			level:    auth.MaxLevel,
+		},
+		"retrieve groups with non-existing metadata": {
+			Total:    uint64(0),
+			Metadata: wrongMeta,
+			Size:     uint64(0),
+			level:    auth.MaxLevel,
+			parentID: parentID,
+		},
+		"retrieve groups with hierarchy level depth": {
+			Total:    n,
+			Size:     2 + 1,
+			level:    uint64(2),
+			parentID: parentID,
+		},
+		"retrieve groups with hierarchy level depth and existing metadata": {
+			Total:    metaNum,
+			Size:     metaNum,
+			level:    3,
+			Metadata: metadata,
+			parentID: parentID,
+		},
+		"retrieve parent groups from children in the middle": {
+			Total:    n/2 + 1,
+			Size:     n/2 + 1,
+			level:    auth.MaxLevel,
+			parentID: parentMiddle,
+		},
+	}
+
+	for desc, tc := range cases {
+		page, err := groupRepo.RetrieveAllParents(context.Background(), tc.parentID, auth.PageMetadata{Level: tc.level, Metadata: tc.Metadata})
+		size := len(page.Groups)
+		assert.Equal(t, tc.Size, uint64(size), fmt.Sprintf("%s: expected size %d got %d\n", desc, tc.Size, size))
+		assert.Equal(t, tc.Total, page.Total, fmt.Sprintf("%s: expected total %d got %d\n", desc, tc.Total, page.Total))
+		assert.Nil(t, err, fmt.Sprintf("%s: expected no error got %d\n", desc, err))
+	}
+}
+
+func TestRetrieveAllChildren(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	metadata := auth.GroupMetadata{
+		"field": "value",
+	}
+	wrongMeta := auth.GroupMetadata{
+		"wrong": "wrong",
+	}
+
+	metaNum := uint64(3)
+
+	n := uint64(10)
+	groupID := generateGroupID(t)
+	firstParentID := groupID
+	parentID := ""
+	parentMiddle := ""
+	for i := uint64(0); i < n; i++ {
+		creationTime := time.Now().UTC()
+		group := auth.Group{
+			ID:        groupID,
+			Name:      fmt.Sprintf("%s-%d", groupName, i),
+			OwnerID:   uid,
+			ParentID:  parentID,
+			CreatedAt: creationTime,
+			UpdatedAt: creationTime,
+		}
+		// Create Groups with metadata.
+		if i < metaNum {
+			group.Metadata = metadata
+		}
+		if i == n/2 {
+			parentMiddle = group.ID
+		}
+		_, err = groupRepo.Save(context.Background(), group)
+		require.Nil(t, err, fmt.Sprintf("unexpected error: %s\n", err))
+		parentID = group.ID
+		groupID = generateGroupID(t)
+	}
+
+	p, err := groupRepo.RetrieveAll(context.Background(), auth.PageMetadata{Level: auth.MaxLevel})
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	assert.Equal(t, n, p.Total, fmt.Sprintf("expected total %d got %d\n", n, p.Total))
+
+	cases := map[string]struct {
+		parentID string
+		size     uint64
+		total    uint64
+		metadata auth.PageMetadata
+	}{
+		"retrieve all children": {
+			size:  auth.MaxLevel,
+			total: n,
+			metadata: auth.PageMetadata{
+				Level: auth.MaxLevel,
+			},
+			parentID: firstParentID,
+		},
+		"retrieve groups with existing metadata": {
+			size:  metaNum,
+			total: metaNum,
+			metadata: auth.PageMetadata{
+				Level:    auth.MaxLevel,
+				Metadata: metadata,
+			},
+			parentID: firstParentID,
+		},
+		"retrieve groups with non-existing metadata": {
+			total: 0,
+			size:  0,
+			metadata: auth.PageMetadata{
+				Level:    auth.MaxLevel,
+				Metadata: wrongMeta,
+			},
+			parentID: firstParentID,
+		},
+		"retrieve groups with hierarchy level depth": {
+			total: n,
+			size:  2,
+			metadata: auth.PageMetadata{
+				Level: 2,
+			},
+			parentID: firstParentID,
+		},
+		"retrieve groups with hierarchy level depth and existing metadata": {
+			total: metaNum,
+			size:  metaNum,
+			metadata: auth.PageMetadata{
+				Level:    3,
+				Metadata: metadata,
+			},
+			parentID: firstParentID,
+		},
+		"retrieve parent groups from children in the middle": {
+			total: n / 2,
+			size:  n / 2,
+			metadata: auth.PageMetadata{
+				Level: auth.MaxLevel,
+			},
+			parentID: parentMiddle,
+		},
+	}
+
+	for desc, tc := range cases {
+		page, err := groupRepo.RetrieveAllChildren(context.Background(), tc.parentID, tc.metadata)
+		size := len(page.Groups)
+		assert.Equal(t, tc.size, uint64(size), fmt.Sprintf("%s: expected size %d got %d\n", desc, tc.size, size))
+		assert.Equal(t, tc.total, page.Total, fmt.Sprintf("%s: expected total %d got %d\n", desc, tc.total, page.Total))
+		assert.Nil(t, err, fmt.Sprintf("%s: expected no error got %d\n", desc, err))
+	}
+}
+
+func TestAssign(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	creationTime := time.Now().UTC()
+	group := auth.Group{
+		ID:        generateGroupID(t),
+		Name:      groupName + "Updated",
+		OwnerID:   uid,
+		CreatedAt: creationTime,
+		UpdatedAt: creationTime,
+	}
+
+	pm := auth.PageMetadata{
+		Offset: 0,
+		Limit:  10,
+	}
+
+	group, err = groupRepo.Save(context.Background(), group)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	mid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	err = groupRepo.Assign(context.Background(), group.ID, "things", mid)
+	require.Nil(t, err, fmt.Sprintf("member assign save unexpected error: %s", err))
+
+	mp, err := groupRepo.Members(context.Background(), group.ID, "things", pm)
+	require.Nil(t, err, fmt.Sprintf("member assign save unexpected error: %s", err))
+	assert.True(t, mp.Total == 1, fmt.Sprintf("retrieve members of a group: expected %d got %d\n", 1, mp.Total))
+
+	err = groupRepo.Assign(context.Background(), group.ID, "things", mid)
+	assert.True(t, errors.Contains(err, auth.ErrMemberAlreadyAssigned), fmt.Sprintf("assign member again: expected %v got %v\n", auth.ErrMemberAlreadyAssigned, err))
+}
+
+func TestUnassign(t *testing.T) {
+	t.Cleanup(func() { cleanUp(t) })
+	dbMiddleware := postgres.NewDatabase(db)
+	groupRepo := postgres.NewGroupRepo(dbMiddleware)
+
+	uid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	creationTime := time.Now().UTC()
+	group := auth.Group{
+		ID:        generateGroupID(t),
+		Name:      groupName + "Updated",
+		OwnerID:   uid,
+		CreatedAt: creationTime,
+		UpdatedAt: creationTime,
+	}
+
+	pm := auth.PageMetadata{
+		Offset: 0,
+		Limit:  10,
+	}
+
+	group, err = groupRepo.Save(context.Background(), group)
+	require.Nil(t, err, fmt.Sprintf("group save got unexpected error: %s", err))
+
+	mid, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	err = groupRepo.Assign(context.Background(), group.ID, "things", mid)
+	require.Nil(t, err, fmt.Sprintf("member assign unexpected error: %s", err))
+
+	mid, err = idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+	err = groupRepo.Assign(context.Background(), group.ID, "things", mid)
+	require.Nil(t, err, fmt.Sprintf("member assign unexpected error: %s", err))
+
+	mp, err := groupRepo.Members(context.Background(), group.ID, "things", pm)
+	require.Nil(t, err, fmt.Sprintf("member assign save unexpected error: %s", err))
+	assert.True(t, mp.Total == 2, fmt.Sprintf("retrieve members of a group: expected %d got %d\n", 2, mp.Total))
+
+	err = groupRepo.Unassign(context.Background(), group.ID, mid)
+	require.Nil(t, err, fmt.Sprintf("member unassign save unexpected error: %s", err))
+
+	mp, err = groupRepo.Members(context.Background(), group.ID, "things", pm)
+	require.Nil(t, err, fmt.Sprintf("members retrieve unexpected error: %s", err))
+	assert.True(t, mp.Total == 1, fmt.Sprintf("retrieve members of a group: expected %d got %d\n", 1, mp.Total))
+}
+
+func cleanUp(t *testing.T) {
+	_, err := db.Exec("delete from group_relations")
+	require.Nil(t, err, fmt.Sprintf("clean relations unexpected error: %s", err))
+	_, err = db.Exec("delete from groups")
+	require.Nil(t, err, fmt.Sprintf("clean groups unexpected error: %s", err))
+}
@@ -0,0 +1,117 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package postgres
+
+import (
+	"fmt"
+
+	"github.com/jmoiron/sqlx"
+	migrate "github.com/rubenv/sql-migrate"
+)
+
+// Config defines the options that are used when connecting to a PostgreSQL instance
+type Config struct {
+	Host        string
+	Port        string
+	User        string
+	Pass        string
+	Name        string
+	SSLMode     string
+	SSLCert     string
+	SSLKey      string
+	SSLRootCert string
+}
+
+// Connect creates a connection to the PostgreSQL instance and applies any
+// unapplied database migrations. A non-nil error is returned to indicate failure.
+func Connect(cfg Config) (*sqlx.DB, error) {
+	url := fmt.Sprintf("host=%s port=%s user=%s dbname=%s password=%s sslmode=%s sslcert=%s sslkey=%s sslrootcert=%s", cfg.Host, cfg.Port, cfg.User, cfg.Name, cfg.Pass, cfg.SSLMode, cfg.SSLCert, cfg.SSLKey, cfg.SSLRootCert)
+
+	db, err := sqlx.Open("postgres", url)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := migrateDB(db); err != nil {
+		return nil, err
+	}
+	return db, nil
+}
+
+func migrateDB(db *sqlx.DB) error {
+	migrations := &migrate.MemoryMigrationSource{
+		Migrations: []*migrate.Migration{
+			{
+				Id: "auth_1",
+				Up: []string{
+					`CREATE TABLE IF NOT EXISTS keys (
+						id          VARCHAR(254) NOT NULL,
+						type        SMALLINT,
+						subject     VARCHAR(254) NOT NULL,
+						issuer_id   UUID NOT NULL,
+						issued_at   TIMESTAMP NOT NULL,
+						expires_at  TIMESTAMP,
+						PRIMARY KEY (id, issuer_id)
+					)`,
+					`CREATE EXTENSION IF NOT EXISTS LTREE`,
+					`CREATE TABLE IF NOT EXISTS groups ( 
+						id          VARCHAR(254) UNIQUE NOT NULL,
+						parent_id   VARCHAR(254), 
+						owner_id    VARCHAR(254),
+						name        VARCHAR(254) NOT NULL,
+						description VARCHAR(1024),
+						metadata    JSONB,
+						path        LTREE,
+						created_at  TIMESTAMPTZ,
+						updated_at  TIMESTAMPTZ,
+						UNIQUE (owner_id, name, parent_id),
+						FOREIGN KEY (parent_id) REFERENCES groups (id) ON DELETE CASCADE
+				   )`,
+					`CREATE TABLE IF NOT EXISTS group_relations (
+						member_id   VARCHAR(254) NOT NULL,
+						group_id    VARCHAR(254) NOT NULL,
+						type        VARCHAR(254),
+						created_at  TIMESTAMPTZ,
+						updated_at  TIMESTAMPTZ,
+						FOREIGN KEY (group_id) REFERENCES groups (id),
+						PRIMARY KEY (member_id, group_id)
+				   )`,
+					`CREATE INDEX path_gist_idx ON groups USING GIST (path);`,
+					`CREATE OR REPLACE FUNCTION inherit_group()
+					 RETURNS trigger 
+					 LANGUAGE PLPGSQL
+					 AS
+					 $$
+					 BEGIN
+					 IF NEW.parent_id IS NULL OR NEW.parent_id = '' THEN
+						RETURN NEW;
+					 END IF;
+					 IF NOT EXISTS (SELECT id FROM groups WHERE id = NEW.parent_id) THEN
+						RAISE EXCEPTION 'wrong parent id';
+					 END IF;
+					 SELECT text2ltree(ltree2text(path) || '.' || NEW.id) INTO NEW.path FROM groups WHERE id = NEW.parent_id;
+					 RETURN NEW;
+					 END;
+					 $$`,
+					`CREATE TRIGGER inherit_group_tr
+					 BEFORE INSERT
+					 ON groups
+					 FOR EACH ROW
+					 EXECUTE PROCEDURE inherit_group();`,
+				},
+				Down: []string{
+					`DROP TABLE IF EXISTS keys`,
+					`DROP EXTENSION IF EXISTS LTREE`,
+					`DROP TABLE IF EXISTS groups`,
+					`DROP TABLE IF EXISTS group_relations`,
+					`DROP FUNCTION IF EXISTS inherit_group`,
+					`DROP TRIGGER IF EXISTS inherit_group_tr ON groups`,
+				},
+			},
+		},
+	}
+
+	_, err := migrate.Exec(db.DB, "postgres", migrations, migrate.Up)
+	return err
+}
@@ -0,0 +1,122 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"github.com/lib/pq"
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+var (
+	errSave     = errors.New("failed to save key in database")
+	errRetrieve = errors.New("failed to retrieve key from database")
+	errDelete   = errors.New("failed to delete key from database")
+)
+var _ auth.KeyRepository = (*repo)(nil)
+
+const (
+	errDuplicate = "unique_violation"
+	errInvalid   = "invalid_text_representation"
+)
+
+type repo struct {
+	db Database
+}
+
+// New instantiates a PostgreSQL implementation of key repository.
+func New(db Database) auth.KeyRepository {
+	return &repo{
+		db: db,
+	}
+}
+
+func (kr repo) Save(ctx context.Context, key auth.Key) (string, error) {
+	q := `INSERT INTO keys (id, type, issuer_id, subject, issued_at, expires_at)
+	      VALUES (:id, :type, :issuer_id, :subject, :issued_at, :expires_at)`
+
+	dbKey := toDBKey(key)
+	if _, err := kr.db.NamedExecContext(ctx, q, dbKey); err != nil {
+
+		pqErr, ok := err.(*pq.Error)
+		if ok {
+			if pqErr.Code.Name() == errDuplicate {
+				return "", errors.Wrap(errors.ErrConflict, pqErr)
+			}
+		}
+
+		return "", errors.Wrap(errSave, err)
+	}
+
+	return dbKey.ID, nil
+}
+
+func (kr repo) Retrieve(ctx context.Context, issuerID, id string) (auth.Key, error) {
+	q := `SELECT id, type, issuer_id, subject, issued_at, expires_at FROM keys WHERE issuer_id = $1 AND id = $2`
+	key := dbKey{}
+	if err := kr.db.QueryRowxContext(ctx, q, issuerID, id).StructScan(&key); err != nil {
+		pqErr, ok := err.(*pq.Error)
+		if err == sql.ErrNoRows || ok && errInvalid == pqErr.Code.Name() {
+			return auth.Key{}, errors.Wrap(errors.ErrNotFound, err)
+		}
+
+		return auth.Key{}, errors.Wrap(errRetrieve, err)
+	}
+
+	return toKey(key), nil
+}
+
+func (kr repo) Remove(ctx context.Context, issuerID, id string) error {
+	q := `DELETE FROM keys WHERE issuer_id = :issuer_id AND id = :id`
+	key := dbKey{
+		ID:       id,
+		IssuerID: issuerID,
+	}
+	if _, err := kr.db.NamedExecContext(ctx, q, key); err != nil {
+		return errors.Wrap(errDelete, err)
+	}
+
+	return nil
+}
+
+type dbKey struct {
+	ID        string       `db:"id"`
+	Type      uint32       `db:"type"`
+	IssuerID  string       `db:"issuer_id"`
+	Subject   string       `db:"subject"`
+	Revoked   bool         `db:"revoked"`
+	IssuedAt  time.Time    `db:"issued_at"`
+	ExpiresAt sql.NullTime `db:"expires_at"`
+}
+
+func toDBKey(key auth.Key) dbKey {
+	ret := dbKey{
+		ID:       key.ID,
+		Type:     key.Type,
+		IssuerID: key.IssuerID,
+		Subject:  key.Subject,
+		IssuedAt: key.IssuedAt,
+	}
+	if !key.ExpiresAt.IsZero() {
+		ret.ExpiresAt = sql.NullTime{Time: key.ExpiresAt, Valid: true}
+	}
+
+	return ret
+}
+
+func toKey(key dbKey) auth.Key {
+	ret := auth.Key{
+		ID:       key.ID,
+		Type:     key.Type,
+		IssuerID: key.IssuerID,
+		Subject:  key.Subject,
+		IssuedAt: key.IssuedAt,
+	}
+	if key.ExpiresAt.Valid {
+		ret.ExpiresAt = key.ExpiresAt.Time
+	}
+
+	return ret
+}
@@ -0,0 +1,160 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package postgres_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/mainflux/mainflux/auth"
+	"github.com/mainflux/mainflux/auth/postgres"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/mainflux/mainflux/pkg/ulid"
+	"github.com/mainflux/mainflux/pkg/uuid"
+	"github.com/opentracing/opentracing-go"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const email = "user-save@example.com"
+
+var (
+	expTime      = time.Now().Add(5 * time.Minute)
+	idProvider   = uuid.New()
+	ulidProvider = ulid.New()
+)
+
+func TestKeySave(t *testing.T) {
+	dbMiddleware := postgres.NewDatabase(db)
+	repo := postgres.New(dbMiddleware)
+
+	id, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	cases := []struct {
+		desc string
+		key  auth.Key
+		err  error
+	}{
+		{
+			desc: "save a new key",
+			key: auth.Key{
+				Subject:   email,
+				IssuedAt:  time.Now(),
+				ExpiresAt: expTime,
+				ID:        id,
+				IssuerID:  id,
+			},
+			err: nil,
+		},
+		{
+			desc: "save with duplicate id",
+			key: auth.Key{
+				Subject:   email,
+				IssuedAt:  time.Now(),
+				ExpiresAt: expTime,
+				ID:        id,
+				IssuerID:  id,
+			},
+			err: errors.ErrConflict,
+		},
+	}
+
+	for _, tc := range cases {
+		_, err := repo.Save(context.Background(), tc.key)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestKeyRetrieve(t *testing.T) {
+	dbMiddleware := postgres.NewDatabase(db)
+	repo := postgres.New(dbMiddleware)
+
+	id, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	key := auth.Key{
+		Subject:   email,
+		IssuedAt:  time.Now(),
+		ExpiresAt: expTime,
+		ID:        id,
+		IssuerID:  id,
+	}
+	_, err = repo.Save(context.Background(), key)
+	assert.Nil(t, err, fmt.Sprintf("Storing Key expected to succeed: %s", err))
+	cases := []struct {
+		desc  string
+		id    string
+		owner string
+		err   error
+	}{
+		{
+			desc:  "retrieve an existing key",
+			id:    key.ID,
+			owner: key.IssuerID,
+			err:   nil,
+		},
+		{
+			desc:  "retrieve key with empty issuer id",
+			id:    key.ID,
+			owner: "",
+			err:   errors.ErrNotFound,
+		},
+		{
+			desc:  "retrieve non-existent key",
+			id:    "",
+			owner: key.IssuerID,
+			err:   errors.ErrNotFound,
+		},
+	}
+
+	for _, tc := range cases {
+		_, err := repo.Retrieve(context.Background(), tc.owner, tc.id)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestKeyRemove(t *testing.T) {
+	dbMiddleware := postgres.NewDatabase(db)
+	repo := postgres.New(dbMiddleware)
+
+	id, err := idProvider.ID()
+	require.Nil(t, err, fmt.Sprintf("got unexpected error: %s", err))
+
+	key := auth.Key{
+		Subject:   email,
+		IssuedAt:  time.Now(),
+		ExpiresAt: expTime,
+		ID:        id,
+		IssuerID:  id,
+	}
+	_, err = repo.Save(opentracing.ContextWithSpan(context.Background(), opentracing.StartSpan("")), key)
+	assert.Nil(t, err, fmt.Sprintf("Storing Key expected to succeed: %s", err))
+	cases := []struct {
+		desc  string
+		id    string
+		owner string
+		err   error
+	}{
+		{
+			desc:  "remove an existing key",
+			id:    key.ID,
+			owner: key.IssuerID,
+			err:   nil,
+		},
+		{
+			desc:  "remove key that does not exist",
+			id:    key.ID,
+			owner: key.IssuerID,
+			err:   nil,
+		},
+	}
+
+	for _, tc := range cases {
+		err := repo.Remove(context.Background(), tc.owner, tc.id)
+		assert.True(t, errors.Contains(err, tc.err), fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
@@ -0,0 +1,76 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package postgres_test contains tests for PostgreSQL repository
+// implementations.
+package postgres_test
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"os"
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/mainflux/mainflux/auth/postgres"
+	dockertest "github.com/ory/dockertest/v3"
+)
+
+var db *sqlx.DB
+
+func TestMain(m *testing.M) {
+	pool, err := dockertest.NewPool("")
+	if err != nil {
+		log.Fatalf("Could not connect to docker: %s", err)
+	}
+
+	cfg := []string{
+		"POSTGRES_USER=test",
+		"POSTGRES_PASSWORD=test",
+		"POSTGRES_DB=test",
+	}
+	container, err := pool.Run("postgres", "13.3-alpine", cfg)
+	if err != nil {
+		log.Fatalf("Could not start container: %s", err)
+	}
+
+	port := container.GetPort("5432/tcp")
+
+	if err := pool.Retry(func() error {
+		url := fmt.Sprintf("host=localhost port=%s user=test dbname=test password=test sslmode=disable", port)
+		db, err := sql.Open("postgres", url)
+		if err != nil {
+			return err
+		}
+		return db.Ping()
+	}); err != nil {
+		log.Fatalf("Could not connect to docker: %s", err)
+	}
+
+	dbConfig := postgres.Config{
+		Host:        "localhost",
+		Port:        port,
+		User:        "test",
+		Pass:        "test",
+		Name:        "test",
+		SSLMode:     "disable",
+		SSLCert:     "",
+		SSLKey:      "",
+		SSLRootCert: "",
+	}
+
+	if db, err = postgres.Connect(dbConfig); err != nil {
+		log.Fatalf("Could not setup test DB connection: %s", err)
+	}
+
+	code := m.Run()
+
+	// Defers will not be run when using os.Exit
+	db.Close()
+	if err := pool.Purge(container); err != nil {
+		log.Fatalf("Could not purge container: %s", err)
+	}
+
+	os.Exit(code)
+}
@@ -0,0 +1,74 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package postgres
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/jmoiron/sqlx"
+	"github.com/opentracing/opentracing-go"
+)
+
+var _ Database = (*database)(nil)
+
+type database struct {
+	db *sqlx.DB
+}
+
+// Database provides a database interface
+type Database interface {
+	NamedExecContext(context.Context, string, interface{}) (sql.Result, error)
+	QueryRowxContext(context.Context, string, ...interface{}) *sqlx.Row
+	QueryxContext(context.Context, string, ...interface{}) (*sqlx.Rows, error)
+	NamedQueryContext(context.Context, string, interface{}) (*sqlx.Rows, error)
+	BeginTxx(ctx context.Context, opts *sql.TxOptions) (*sqlx.Tx, error)
+}
+
+// NewDatabase creates a ThingDatabase instance
+func NewDatabase(db *sqlx.DB) Database {
+	return &database{
+		db: db,
+	}
+}
+
+func (d database) NamedQueryContext(ctx context.Context, query string, args interface{}) (*sqlx.Rows, error) {
+	addSpanTags(ctx, query)
+	return d.db.NamedQueryContext(ctx, query, args)
+}
+
+func (d database) NamedExecContext(ctx context.Context, query string, args interface{}) (sql.Result, error) {
+	addSpanTags(ctx, query)
+	return d.db.NamedExecContext(ctx, query, args)
+}
+
+func (d database) QueryRowxContext(ctx context.Context, query string, args ...interface{}) *sqlx.Row {
+	addSpanTags(ctx, query)
+	return d.db.QueryRowxContext(ctx, query, args...)
+}
+
+func (d database) QueryxContext(ctx context.Context, query string, args ...interface{}) (*sqlx.Rows, error) {
+	addSpanTags(ctx, query)
+	return d.db.QueryxContext(ctx, query, args...)
+}
+
+func (d database) BeginTxx(ctx context.Context, opts *sql.TxOptions) (*sqlx.Tx, error) {
+	span := opentracing.SpanFromContext(ctx)
+	if span != nil {
+		span.SetTag("span.kind", "client")
+		span.SetTag("peer.service", "postgres")
+		span.SetTag("db.type", "sql")
+	}
+	return d.db.BeginTxx(ctx, opts)
+}
+
+func addSpanTags(ctx context.Context, query string) {
+	span := opentracing.SpanFromContext(ctx)
+	if span != nil {
+		span.SetTag("sql.statement", query)
+		span.SetTag("span.kind", "client")
+		span.SetTag("peer.service", "postgres")
+		span.SetTag("db.type", "sql")
+	}
+}
@@ -0,0 +1,440 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package auth
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/mainflux/mainflux/pkg/ulid"
+)
+
+const (
+	recoveryDuration = 5 * time.Minute
+	thingsGroupType  = "things"
+
+	authoritiesObject = "authorities"
+	memberRelation    = "member"
+)
+
+var (
+	// ErrFailedToRetrieveMembers failed to retrieve group members.
+	ErrFailedToRetrieveMembers = errors.New("failed to retrieve group members")
+
+	// ErrFailedToRetrieveMembership failed to retrieve memberships
+	ErrFailedToRetrieveMembership = errors.New("failed to retrieve memberships")
+
+	// ErrFailedToRetrieveAll failed to retrieve groups.
+	ErrFailedToRetrieveAll = errors.New("failed to retrieve all groups")
+
+	// ErrFailedToRetrieveParents failed to retrieve groups.
+	ErrFailedToRetrieveParents = errors.New("failed to retrieve all groups")
+
+	// ErrFailedToRetrieveChildren failed to retrieve groups.
+	ErrFailedToRetrieveChildren = errors.New("failed to retrieve all groups")
+
+	errIssueUser = errors.New("failed to issue new login key")
+	errIssueTmp  = errors.New("failed to issue new temporary key")
+	errRevoke    = errors.New("failed to remove key")
+	errRetrieve  = errors.New("failed to retrieve key data")
+	errIdentify  = errors.New("failed to validate token")
+)
+
+// Authn specifies an API that must be fullfiled by the domain service
+// implementation, and all of its decorators (e.g. logging & metrics).
+// Token is a string value of the actual Key and is used to authenticate
+// an Auth service request.
+type Authn interface {
+	// Issue issues a new Key, returning its token value alongside.
+	Issue(ctx context.Context, token string, key Key) (Key, string, error)
+
+	// Revoke removes the Key with the provided id that is
+	// issued by the user identified by the provided key.
+	Revoke(ctx context.Context, token, id string) error
+
+	// RetrieveKey retrieves data for the Key identified by the provided
+	// ID, that is issued by the user identified by the provided key.
+	RetrieveKey(ctx context.Context, token, id string) (Key, error)
+
+	// Identify validates token token. If token is valid, content
+	// is returned. If token is invalid, or invocation failed for some
+	// other reason, non-nil error value is returned in response.
+	Identify(ctx context.Context, token string) (Identity, error)
+}
+
+// Service specifies an API that must be fulfilled by the domain service
+// implementation, and all of its decorators (e.g. logging & metrics).
+// Token is a string value of the actual Key and is used to authenticate
+// an Auth service request.
+type Service interface {
+	Authn
+	Authz
+
+	// GroupService implements groups API, creating groups, assigning members
+	GroupService
+}
+
+var _ Service = (*service)(nil)
+
+type service struct {
+	keys          KeyRepository
+	groups        GroupRepository
+	idProvider    mainflux.IDProvider
+	ulidProvider  mainflux.IDProvider
+	agent         PolicyAgent
+	tokenizer     Tokenizer
+	loginDuration time.Duration
+}
+
+// New instantiates the auth service implementation.
+func New(keys KeyRepository, groups GroupRepository, idp mainflux.IDProvider, tokenizer Tokenizer, policyAgent PolicyAgent, duration time.Duration) Service {
+	return &service{
+		tokenizer:     tokenizer,
+		keys:          keys,
+		groups:        groups,
+		idProvider:    idp,
+		ulidProvider:  ulid.New(),
+		agent:         policyAgent,
+		loginDuration: duration,
+	}
+}
+
+func (svc service) Issue(ctx context.Context, token string, key Key) (Key, string, error) {
+	if key.IssuedAt.IsZero() {
+		return Key{}, "", ErrInvalidKeyIssuedAt
+	}
+	switch key.Type {
+	case APIKey:
+		return svc.userKey(ctx, token, key)
+	case RecoveryKey:
+		return svc.tmpKey(recoveryDuration, key)
+	default:
+		return svc.tmpKey(svc.loginDuration, key)
+	}
+}
+
+func (svc service) Revoke(ctx context.Context, token, id string) error {
+	issuerID, _, err := svc.login(token)
+	if err != nil {
+		return errors.Wrap(errRevoke, err)
+	}
+	if err := svc.keys.Remove(ctx, issuerID, id); err != nil {
+		return errors.Wrap(errRevoke, err)
+	}
+	return nil
+}
+
+func (svc service) RetrieveKey(ctx context.Context, token, id string) (Key, error) {
+	issuerID, _, err := svc.login(token)
+	if err != nil {
+		return Key{}, errors.Wrap(errRetrieve, err)
+	}
+
+	return svc.keys.Retrieve(ctx, issuerID, id)
+}
+
+func (svc service) Identify(ctx context.Context, token string) (Identity, error) {
+	key, err := svc.tokenizer.Parse(token)
+	if err == ErrAPIKeyExpired {
+		err = svc.keys.Remove(ctx, key.IssuerID, key.ID)
+		return Identity{}, errors.Wrap(ErrAPIKeyExpired, err)
+	}
+	if err != nil {
+		return Identity{}, errors.Wrap(errIdentify, err)
+	}
+
+	switch key.Type {
+	case RecoveryKey, LoginKey:
+		return Identity{ID: key.IssuerID, Email: key.Subject}, nil
+	case APIKey:
+		_, err := svc.keys.Retrieve(context.TODO(), key.IssuerID, key.ID)
+		if err != nil {
+			return Identity{}, errors.ErrAuthentication
+		}
+		return Identity{ID: key.IssuerID, Email: key.Subject}, nil
+	default:
+		return Identity{}, errors.ErrAuthentication
+	}
+}
+
+func (svc service) Authorize(ctx context.Context, pr PolicyReq) error {
+	return svc.agent.CheckPolicy(ctx, pr)
+}
+
+func (svc service) AddPolicy(ctx context.Context, pr PolicyReq) error {
+	return svc.agent.AddPolicy(ctx, pr)
+}
+
+func (svc service) AddPolicies(ctx context.Context, token, object string, subjectIDs, relations []string) error {
+	user, err := svc.Identify(ctx, token)
+	if err != nil {
+		return err
+	}
+
+	if err := svc.Authorize(ctx, PolicyReq{Object: authoritiesObject, Relation: memberRelation, Subject: user.ID}); err != nil {
+		return err
+	}
+
+	var errs error
+	for _, subjectID := range subjectIDs {
+		for _, relation := range relations {
+			if err := svc.AddPolicy(ctx, PolicyReq{Object: object, Relation: relation, Subject: subjectID}); err != nil {
+				errs = errors.Wrap(fmt.Errorf("cannot add '%s' policy on object '%s' for subject '%s': %s", relation, object, subjectID, err), errs)
+			}
+		}
+	}
+	return errs
+}
+
+func (svc service) DeletePolicy(ctx context.Context, pr PolicyReq) error {
+	return svc.agent.DeletePolicy(ctx, pr)
+}
+
+func (svc service) DeletePolicies(ctx context.Context, token, object string, subjectIDs, relations []string) error {
+	user, err := svc.Identify(ctx, token)
+	if err != nil {
+		return err
+	}
+
+	// Check if the user identified by token is the admin.
+	if err := svc.Authorize(ctx, PolicyReq{Object: authoritiesObject, Relation: memberRelation, Subject: user.ID}); err != nil {
+		return err
+	}
+
+	var errs error
+	for _, subjectID := range subjectIDs {
+		for _, relation := range relations {
+			if err := svc.DeletePolicy(ctx, PolicyReq{Object: object, Relation: relation, Subject: subjectID}); err != nil {
+				errs = errors.Wrap(fmt.Errorf("cannot delete '%s' policy on object '%s' for subject '%s': %s", relation, object, subjectID, err), errs)
+			}
+		}
+	}
+	return errs
+}
+
+func (svc service) AssignGroupAccessRights(ctx context.Context, token, thingGroupID, userGroupID string) error {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return err
+	}
+	return svc.agent.AddPolicy(ctx, PolicyReq{Object: thingGroupID, Relation: memberRelation, Subject: fmt.Sprintf("%s:%s#%s", "members", userGroupID, memberRelation)})
+}
+
+func (svc service) ListPolicies(ctx context.Context, pr PolicyReq) (PolicyPage, error) {
+	res, err := svc.agent.RetrievePolicies(ctx, pr)
+	if err != nil {
+		return PolicyPage{}, err
+	}
+	var page PolicyPage
+	for _, tuple := range res {
+		page.Policies = append(page.Policies, tuple.GetObject())
+	}
+	return page, err
+}
+
+func (svc service) tmpKey(duration time.Duration, key Key) (Key, string, error) {
+	key.ExpiresAt = key.IssuedAt.Add(duration)
+	secret, err := svc.tokenizer.Issue(key)
+	if err != nil {
+		return Key{}, "", errors.Wrap(errIssueTmp, err)
+	}
+
+	return key, secret, nil
+}
+
+func (svc service) userKey(ctx context.Context, token string, key Key) (Key, string, error) {
+	id, sub, err := svc.login(token)
+	if err != nil {
+		return Key{}, "", errors.Wrap(errIssueUser, err)
+	}
+
+	key.IssuerID = id
+	if key.Subject == "" {
+		key.Subject = sub
+	}
+
+	keyID, err := svc.idProvider.ID()
+	if err != nil {
+		return Key{}, "", errors.Wrap(errIssueUser, err)
+	}
+	key.ID = keyID
+
+	if _, err := svc.keys.Save(ctx, key); err != nil {
+		return Key{}, "", errors.Wrap(errIssueUser, err)
+	}
+
+	secret, err := svc.tokenizer.Issue(key)
+	if err != nil {
+		return Key{}, "", errors.Wrap(errIssueUser, err)
+	}
+
+	return key, secret, nil
+}
+
+func (svc service) login(token string) (string, string, error) {
+	key, err := svc.tokenizer.Parse(token)
+	if err != nil {
+		return "", "", err
+	}
+	// Only login key token is valid for login.
+	if key.Type != LoginKey || key.IssuerID == "" {
+		return "", "", errors.ErrAuthentication
+	}
+
+	return key.IssuerID, key.Subject, nil
+}
+
+func (svc service) CreateGroup(ctx context.Context, token string, group Group) (Group, error) {
+	user, err := svc.Identify(ctx, token)
+	if err != nil {
+		return Group{}, err
+	}
+
+	ulid, err := svc.ulidProvider.ID()
+	if err != nil {
+		return Group{}, err
+	}
+
+	timestamp := getTimestmap()
+	group.UpdatedAt = timestamp
+	group.CreatedAt = timestamp
+
+	group.ID = ulid
+	group.OwnerID = user.ID
+
+	group, err = svc.groups.Save(ctx, group)
+	if err != nil {
+		return Group{}, err
+	}
+
+	if err := svc.agent.AddPolicy(ctx, PolicyReq{Object: group.ID, Relation: memberRelation, Subject: user.ID}); err != nil {
+		return Group{}, err
+	}
+
+	return group, nil
+}
+
+func (svc service) ListGroups(ctx context.Context, token string, pm PageMetadata) (GroupPage, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return GroupPage{}, err
+	}
+	return svc.groups.RetrieveAll(ctx, pm)
+}
+
+func (svc service) ListParents(ctx context.Context, token string, childID string, pm PageMetadata) (GroupPage, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return GroupPage{}, err
+	}
+	return svc.groups.RetrieveAllParents(ctx, childID, pm)
+}
+
+func (svc service) ListChildren(ctx context.Context, token string, parentID string, pm PageMetadata) (GroupPage, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return GroupPage{}, err
+	}
+	return svc.groups.RetrieveAllChildren(ctx, parentID, pm)
+}
+
+func (svc service) ListMembers(ctx context.Context, token string, groupID, groupType string, pm PageMetadata) (MemberPage, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return MemberPage{}, err
+	}
+	mp, err := svc.groups.Members(ctx, groupID, groupType, pm)
+	if err != nil {
+		return MemberPage{}, errors.Wrap(ErrFailedToRetrieveMembers, err)
+	}
+	return mp, nil
+}
+
+func (svc service) RemoveGroup(ctx context.Context, token, id string) error {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return err
+	}
+	return svc.groups.Delete(ctx, id)
+}
+
+func (svc service) UpdateGroup(ctx context.Context, token string, group Group) (Group, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return Group{}, err
+	}
+
+	group.UpdatedAt = getTimestmap()
+	return svc.groups.Update(ctx, group)
+}
+
+func (svc service) ViewGroup(ctx context.Context, token, id string) (Group, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return Group{}, err
+	}
+	return svc.groups.RetrieveByID(ctx, id)
+}
+
+func (svc service) Assign(ctx context.Context, token string, groupID, groupType string, memberIDs ...string) error {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return err
+	}
+
+	if err := svc.groups.Assign(ctx, groupID, groupType, memberIDs...); err != nil {
+		return err
+	}
+
+	if groupType == thingsGroupType {
+		ss := fmt.Sprintf("%s:%s#%s", "members", groupID, memberRelation)
+		var errs error
+		for _, memberID := range memberIDs {
+			for _, action := range []string{"read", "write", "delete"} {
+				if err := svc.agent.AddPolicy(ctx, PolicyReq{Object: memberID, Relation: action, Subject: ss}); err != nil {
+					errs = errors.Wrap(fmt.Errorf("cannot add thing: '%s' to thing group: '%s'", memberID, groupID), errs)
+				}
+			}
+		}
+		return errs
+	}
+
+	var errs error
+	for _, memberID := range memberIDs {
+		if err := svc.agent.AddPolicy(ctx, PolicyReq{Object: groupID, Relation: memberRelation, Subject: memberID}); err != nil {
+			errs = errors.Wrap(fmt.Errorf("cannot add user: '%s' to user group: '%s'", memberID, groupID), errs)
+		}
+	}
+	return errs
+}
+
+func (svc service) Unassign(ctx context.Context, token string, groupID string, memberIDs ...string) error {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return err
+	}
+
+	ss := fmt.Sprintf("%s:%s#%s", "members", groupID, memberRelation)
+	var errs error
+	for _, memberID := range memberIDs {
+		// If the member is a user, <groupID>#member@memberID must be deleted.
+		if err := svc.agent.DeletePolicy(ctx, PolicyReq{Object: groupID, Relation: memberRelation, Subject: memberID}); err != nil {
+			errs = errors.Wrap(fmt.Errorf("cannot delete a membership of member '%s' from group '%s'", memberID, groupID), errs)
+		}
+
+		// If the member is a Thing, memberID#read|write|delete@(members:groupID#member) must be deleted.
+		for _, action := range []string{"read", "write", "delete"} {
+			if err := svc.agent.DeletePolicy(ctx, PolicyReq{Object: memberID, Relation: action, Subject: ss}); err != nil {
+				errs = errors.Wrap(fmt.Errorf("cannot delete '%s' policy from member '%s'", action, memberID), errs)
+			}
+		}
+	}
+
+	err := svc.groups.Unassign(ctx, groupID, memberIDs...)
+	return errors.Wrap(err, errs)
+}
+
+func (svc service) ListMemberships(ctx context.Context, token string, memberID string, pm PageMetadata) (GroupPage, error) {
+	if _, err := svc.Identify(ctx, token); err != nil {
+		return GroupPage{}, err
+	}
+	return svc.groups.Memberships(ctx, memberID, pm)
+}
+
+func getTimestmap() time.Time {
+	return time.Now().UTC().Round(time.Millisecond)
+}
@@ -0,0 +1,13 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package auth
+
+// Tokenizer specifies API for encoding and decoding between string and Key.
+type Tokenizer interface {
+	// Issue converts API Key to its string representation.
+	Issue(Key) (string, error)
+
+	// Parse extracts API Key data from string token.
+	Parse(string) (Key, error)
+}
@@ -0,0 +1,129 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package tracing contains middlewares that will add spans to existing traces.
+package tracing
+
+import (
+	"context"
+
+	"github.com/mainflux/mainflux/auth"
+	opentracing "github.com/opentracing/opentracing-go"
+)
+
+const (
+	assign              = "assign"
+	saveGroup           = "save_group"
+	deleteGroup         = "delete_group"
+	updateGroup         = "update_group"
+	retrieveByID        = "retrieve_by_id"
+	retrieveAllParents  = "retrieve_all_parents"
+	retrieveAllChildren = "retrieve_all_children"
+	retrieveAll         = "retrieve_all_groups"
+	memberships         = "memberships"
+	members             = "members"
+	unassign            = "unassign"
+)
+
+var _ auth.GroupRepository = (*groupRepositoryMiddleware)(nil)
+
+type groupRepositoryMiddleware struct {
+	tracer opentracing.Tracer
+	repo   auth.GroupRepository
+}
+
+// GroupRepositoryMiddleware tracks request and their latency, and adds spans to context.
+func GroupRepositoryMiddleware(tracer opentracing.Tracer, gr auth.GroupRepository) auth.GroupRepository {
+	return groupRepositoryMiddleware{
+		tracer: tracer,
+		repo:   gr,
+	}
+}
+
+func (grm groupRepositoryMiddleware) Save(ctx context.Context, g auth.Group) (auth.Group, error) {
+	span := createSpan(ctx, grm.tracer, saveGroup)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Save(ctx, g)
+}
+
+func (grm groupRepositoryMiddleware) Update(ctx context.Context, g auth.Group) (auth.Group, error) {
+	span := createSpan(ctx, grm.tracer, updateGroup)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Update(ctx, g)
+}
+
+func (grm groupRepositoryMiddleware) Delete(ctx context.Context, groupID string) error {
+	span := createSpan(ctx, grm.tracer, deleteGroup)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Delete(ctx, groupID)
+}
+
+func (grm groupRepositoryMiddleware) RetrieveByID(ctx context.Context, id string) (auth.Group, error) {
+	span := createSpan(ctx, grm.tracer, retrieveByID)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.RetrieveByID(ctx, id)
+}
+
+func (grm groupRepositoryMiddleware) RetrieveAllParents(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	span := createSpan(ctx, grm.tracer, retrieveAllParents)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.RetrieveAllParents(ctx, groupID, pm)
+}
+
+func (grm groupRepositoryMiddleware) RetrieveAllChildren(ctx context.Context, groupID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	span := createSpan(ctx, grm.tracer, retrieveAllChildren)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.RetrieveAllChildren(ctx, groupID, pm)
+}
+
+func (grm groupRepositoryMiddleware) RetrieveAll(ctx context.Context, pm auth.PageMetadata) (auth.GroupPage, error) {
+	span := createSpan(ctx, grm.tracer, retrieveAll)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.RetrieveAll(ctx, pm)
+}
+
+func (grm groupRepositoryMiddleware) Memberships(ctx context.Context, memberID string, pm auth.PageMetadata) (auth.GroupPage, error) {
+	span := createSpan(ctx, grm.tracer, memberships)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Memberships(ctx, memberID, pm)
+}
+
+func (grm groupRepositoryMiddleware) Members(ctx context.Context, groupID, groupType string, pm auth.PageMetadata) (auth.MemberPage, error) {
+	span := createSpan(ctx, grm.tracer, members)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Members(ctx, groupID, groupType, pm)
+}
+
+func (grm groupRepositoryMiddleware) Assign(ctx context.Context, groupID, groupType string, memberIDs ...string) error {
+	span := createSpan(ctx, grm.tracer, assign)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Assign(ctx, groupID, groupType, memberIDs...)
+}
+
+func (grm groupRepositoryMiddleware) Unassign(ctx context.Context, groupID string, memberIDs ...string) error {
+	span := createSpan(ctx, grm.tracer, unassign)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return grm.repo.Unassign(ctx, groupID, memberIDs...)
+}
@@ -0,0 +1,73 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package tracing contains middlewares that will add spans
+// to existing traces.
+package tracing
+
+import (
+	"context"
+
+	"github.com/mainflux/mainflux/auth"
+	opentracing "github.com/opentracing/opentracing-go"
+)
+
+const (
+	saveOp     = "save"
+	retrieveOp = "retrieve_by_id"
+	revokeOp   = "remove"
+)
+
+var _ auth.KeyRepository = (*keyRepositoryMiddleware)(nil)
+
+// keyRepositoryMiddleware tracks request and their latency, and adds spans
+// to context.
+type keyRepositoryMiddleware struct {
+	tracer opentracing.Tracer
+	repo   auth.KeyRepository
+}
+
+// New tracks request and their latency, and adds spans
+// to context.
+func New(repo auth.KeyRepository, tracer opentracing.Tracer) auth.KeyRepository {
+	return keyRepositoryMiddleware{
+		tracer: tracer,
+		repo:   repo,
+	}
+}
+
+
+func (krm keyRepositoryMiddleware) Save(ctx context.Context, key auth.Key) (string, error) {
+	span := createSpan(ctx, krm.tracer, saveOp)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return krm.repo.Save(ctx, key)
+}
+
+func (krm keyRepositoryMiddleware) Retrieve(ctx context.Context, owner, id string) (auth.Key, error) {
+	span := createSpan(ctx, krm.tracer, retrieveOp)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return krm.repo.Retrieve(ctx, owner, id)
+}
+
+func (krm keyRepositoryMiddleware) Remove(ctx context.Context, owner, id string) error {
+	span := createSpan(ctx, krm.tracer, revokeOp)
+	defer span.Finish()
+	ctx = opentracing.ContextWithSpan(ctx, span)
+
+	return krm.repo.Remove(ctx, owner, id)
+}
+
+func createSpan(ctx context.Context, tracer opentracing.Tracer, opName string) opentracing.Span {
+	if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
+		return tracer.StartSpan(
+			opName,
+			opentracing.ChildOf(parentSpan.Context()),
+		)
+	}
+
+	return tracer.StartSpan(opName)
+}
@@ -0,0 +1,120 @@
+# BOOTSTRAP SERVICE
+
+New devices need to be configured properly and connected to the Mainflux. Bootstrap service is used in order to accomplish that. This service provides the following features:
+
+  1) Creating new Mainflux Things
+  2) Providing basic configuration for the newly created Things
+  3) Enabling/disabling Things
+
+Pre-provisioning a new Thing is as simple as sending Configuration data to the Bootstrap service. Once the Thing is online, it sends a request for initial config to Bootstrap service. Bootstrap service provides an API for enabling and disabling Things. Only enabled Things can exchange messages over Mainflux. Bootstrapping does not implicitly enable Things, it has to be done manually.
+
+In order to bootstrap successfully, the Thing needs to send bootstrapping request to the specific URL, as well as a secret key. This key and URL are pre-provisioned during the manufacturing process. If the Thing is provisioned on the Bootstrap service side, the corresponding configuration will be sent as a response. Otherwise, the Thing will be saved so that it can be provisioned later.
+
+## Thing Configuration Entity
+
+Thing Configuration consists of two logical parts: the custom configuration that can be interpreted by the Thing itself and Mainflux-related configuration. Mainflux config contains:
+
+  1) corresponding Mainflux Thing ID
+  2) corresponding Mainflux Thing key
+  3) list of the Mainflux channels the Thing is connected to
+
+>Note: list of channels contains IDs of the Mainflux channels. These channels are _pre-provisioned_ on the Mainflux side and, unlike corresponding Mainflux Thing, Bootstrap service is not able to create Mainflux Channels.
+
+Enabling and disabling Thing (adding Thing to/from whitelist) is as simple as connecting corresponding Mainflux Thing to the given list of Channels. Configuration keeps _state_ of the Thing:
+
+| State    | What it means                                          |
+|----------|--------------------------------------------------------|
+| Inactive | Thing is created, but isn't enabled                    |
+| Active   | Thing is able to communicate using Mainflux            |
+
+Switching between states `Active` and `Inactive` enables and disables Thing, respectively.
+
+Thing configuration also contains the so-called `external ID` and `external key`. An external ID is a unique identifier of corresponding Thing. For example, a device MAC address is a good choice for external ID. External key is a secret key that is used for authentication during the bootstrapping procedure.
+
+## Configuration
+
+The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.
+
+| Variable                      | Description                                                             | Default                          |
+|-------------------------------|-------------------------------------------------------------------------|----------------------------------|
+| MF_BOOTSTRAP_LOG_LEVEL        | Log level for Bootstrap (debug, info, warn, error)                      | error                            |
+| MF_BOOTSTRAP_DB_HOST          | Database host address                                                   | localhost                        |
+| MF_BOOTSTRAP_DB_PORT          | Database host port                                                      | 5432                             |
+| MF_BOOTSTRAP_DB_USER          | Database user                                                           | mainflux                         |
+| MF_BOOTSTRAP_DB_PASS          | Database password                                                       | mainflux                         |
+| MF_BOOTSTRAP_DB               | Name of the database used by the service                                | bootstrap                        |
+| MF_BOOTSTRAP_DB_SSL_MODE      | Database connection SSL mode (disable, require, verify-ca, verify-full) | disable                          |
+| MF_BOOTSTRAP_DB_SSL_CERT      | Path to the PEM encoded certificate file                                |                                  |
+| MF_BOOTSTRAP_DB_SSL_KEY       | Path to the PEM encoded key file                                        |                                  |
+| MF_BOOTSTRAP_DB_SSL_ROOT_CERT | Path to the PEM encoded root certificate file                           |                                  |
+| MF_BOOTSTRAP_ENCRYPT_KEY      | Secret key for secure bootstrapping encryption                          | 12345678910111213141516171819202 |
+| MF_BOOTSTRAP_CLIENT_TLS       | Flag that indicates if TLS should be turned on                          | false                            |
+| MF_BOOTSTRAP_CA_CERTS         | Path to trusted CAs in PEM format                                       |                                  |
+| MF_BOOTSTRAP_PORT             | Bootstrap service HTTP port                                             | 8180                             |
+| MF_BOOTSTRAP_SERVER_CERT      | Path to server certificate in pem format                                |                                  |
+| MF_BOOTSTRAP_SERVER_KEY       | Path to server key in pem format                                        |                                  |
+| MF_SDK_BASE_URL               | Base url for Mainflux SDK                                               | http://localhost                 |
+| MF_SDK_THINGS_PREFIX          | SDK prefix for Things service                                           |                                  |
+| MF_THINGS_ES_URL              | Things service event source URL                                         | localhost:6379                   |
+| MF_THINGS_ES_PASS             | Things service event source password                                    |                                  |
+| MF_THINGS_ES_DB               | Things service event source database                                    | 0                                |
+| MF_BOOTSTRAP_ES_URL           | Bootstrap service event source URL                                      | localhost:6379                   |
+| MF_BOOTSTRAP_ES_PASS          | Bootstrap service event source password                                 |                                  |
+| MF_BOOTSTRAP_ES_DB            | Bootstrap service event source database                                 | 0                                |
+| MF_BOOTSTRAP_EVENT_CONSUMER   | Bootstrap service event source consumer name                            | bootstrap                        |
+| MF_JAEGER_URL                 | Jaeger server URL                                                       | localhost:6831                   |
+| MF_AUTH_GRPC_URL              | Auth service gRPC URL                                                   | localhost:8181                   |
+| MF_AUTH_GRPC_TIMEOUT          | Auth service gRPC request timeout in seconds                            | 1s                               |
+
+## Deployment
+
+The service itself is distributed as Docker container. Check the [`boostrap`](https://github.com/mainflux/mainflux/blob/master/docker/addons/bootstrap/docker-compose.yml#L32-L56) service section in 
+docker-compose to see how service is deployed.
+
+To start the service outside of the container, execute the following shell script:
+
+```bash
+# download the latest version of the service
+git clone https://github.com/mainflux/mainflux
+
+cd mainflux
+
+# compile the service
+make bootstrap
+
+# copy binary to bin
+make install
+
+# set the environment variables and run the service
+MF_BOOTSTRAP_LOG_LEVEL=[Bootstrap log level] \
+MF_BOOTSTRAP_DB_HOST=[Database host address] \
+MF_BOOTSTRAP_DB_PORT=[Database host port] \
+MF_BOOTSTRAP_DB_USER=[Database user] \
+MF_BOOTSTRAP_DB_PASS=[Database password] \
+MF_BOOTSTRAP_DB=[Name of the database used by the service] \
+MF_BOOTSTRAP_DB_SSL_MODE=[SSL mode to connect to the database with] \
+MF_BOOTSTRAP_DB_SSL_CERT=[Path to the PEM encoded certificate file] \
+MF_BOOTSTRAP_DB_SSL_KEY=[Path to the PEM encoded key file] \
+MF_BOOTSTRAP_DB_SSL_ROOT_CERT=[Path to the PEM encoded root certificate file] \
+MF_BOOTSTRAP_ENCRYPT_KEY=[Hex-encoded encryption key used for secure bootstrap] \
+MF_BOOTSTRAP_CLIENT_TLS=[Boolean value to enable/disable client TLS] \
+MF_BOOTSTRAP_CA_CERTS=[Path to trusted CAs in PEM format] \
+MF_BOOTSTRAP_PORT=[Service HTTP port] \
+MF_BOOTSTRAP_SERVER_CERT=[Path to server certificate] \
+MF_BOOTSTRAP_SERVER_KEY=[Path to server key] \
+MF_SDK_BASE_URL=[Base SDK URL for the Mainflux services] \
+MF_SDK_THINGS_PREFIX=[SDK prefix for Things service] \
+MF_JAEGER_URL=[Jaeger server URL] \
+MF_AUTH_GRPC_URL=[Auth service gRPC URL] \
+MF_AUTH_GRPC_TIMEOUT=[Auth service gRPC request timeout in seconds] \
+$GOBIN/mainflux-bootstrap
+```
+
+Setting `MF_BOOTSTRAP_CA_CERTS` expects a file in PEM format of trusted CAs. This will enable TLS against the Users gRPC endpoint trusting only those CAs that are provided.
+
+## Usage
+
+For more information about service capabilities and its usage, please check out
+the [API documentation](https://api.mainflux.io/?urls.primaryName=bootstrap-openapi.yml).
+
+[doc]: https://docs.mainflux.io
@@ -0,0 +1,5 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package api contains implementation of bootstrap service HTTP API.
+package api
@@ -0,0 +1,245 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package api
+
+import (
+	"context"
+
+	"github.com/go-kit/kit/endpoint"
+	"github.com/mainflux/mainflux/bootstrap"
+)
+
+func addEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(addReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		channels := []bootstrap.Channel{}
+		for _, c := range req.Channels {
+			channels = append(channels, bootstrap.Channel{ID: c})
+		}
+
+		config := bootstrap.Config{
+			MFThing:     req.ThingID,
+			ExternalID:  req.ExternalID,
+			ExternalKey: req.ExternalKey,
+			MFChannels:  channels,
+			Name:        req.Name,
+			ClientCert:  req.ClientCert,
+			ClientKey:   req.ClientKey,
+			CACert:      req.CACert,
+			Content:     req.Content,
+		}
+
+		saved, err := svc.Add(ctx, req.token, config)
+		if err != nil {
+			return nil, err
+		}
+
+		res := configRes{
+			id:      saved.MFThing,
+			created: true,
+		}
+
+		return res, nil
+	}
+}
+
+func updateCertEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(updateCertReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.UpdateCert(ctx, req.token, req.thingID, req.ClientCert, req.ClientKey, req.CACert); err != nil {
+			return nil, err
+		}
+
+		res := configRes{}
+
+		return res, nil
+	}
+}
+
+func viewEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(entityReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		config, err := svc.View(ctx, req.token, req.id)
+		if err != nil {
+			return nil, err
+		}
+
+		var channels []channelRes
+		for _, ch := range config.MFChannels {
+			channels = append(channels, channelRes{
+				ID:       ch.ID,
+				Name:     ch.Name,
+				Metadata: ch.Metadata,
+			})
+		}
+
+		res := viewRes{
+			MFThing:     config.MFThing,
+			MFKey:       config.MFKey,
+			Channels:    channels,
+			ExternalID:  config.ExternalID,
+			ExternalKey: config.ExternalKey,
+			Name:        config.Name,
+			Content:     config.Content,
+			State:       config.State,
+		}
+
+		return res, nil
+	}
+}
+
+func updateEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(updateReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		config := bootstrap.Config{
+			MFThing: req.id,
+			Name:    req.Name,
+			Content: req.Content,
+		}
+
+		if err := svc.Update(ctx, req.token, config); err != nil {
+			return nil, err
+		}
+
+		res := configRes{
+			id:      config.MFThing,
+			created: false,
+		}
+
+		return res, nil
+	}
+}
+
+func updateConnEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(updateConnReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.UpdateConnections(ctx, req.token, req.id, req.Channels); err != nil {
+			return nil, err
+		}
+
+		res := configRes{
+			id:      req.id,
+			created: false,
+		}
+
+		return res, nil
+	}
+}
+
+func listEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(listReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		page, err := svc.List(ctx, req.token, req.filter, req.offset, req.limit)
+		if err != nil {
+			return nil, err
+		}
+		res := listRes{
+			Total:   page.Total,
+			Offset:  page.Offset,
+			Limit:   page.Limit,
+			Configs: []viewRes{},
+		}
+
+		for _, cfg := range page.Configs {
+			var channels []channelRes
+			for _, ch := range cfg.MFChannels {
+				channels = append(channels, channelRes{
+					ID:       ch.ID,
+					Name:     ch.Name,
+					Metadata: ch.Metadata,
+				})
+			}
+
+			view := viewRes{
+				MFThing:     cfg.MFThing,
+				MFKey:       cfg.MFKey,
+				Channels:    channels,
+				ExternalID:  cfg.ExternalID,
+				ExternalKey: cfg.ExternalKey,
+				Name:        cfg.Name,
+				Content:     cfg.Content,
+				State:       cfg.State,
+			}
+			res.Configs = append(res.Configs, view)
+		}
+
+		return res, nil
+	}
+}
+
+func removeEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(entityReq)
+
+		if err := req.validate(); err != nil {
+			return removeRes{}, err
+		}
+
+		if err := svc.Remove(ctx, req.token, req.id); err != nil {
+			return nil, err
+		}
+
+		return removeRes{}, nil
+	}
+}
+
+func bootstrapEndpoint(svc bootstrap.Service, reader bootstrap.ConfigReader, secure bool) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(bootstrapReq)
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		cfg, err := svc.Bootstrap(ctx, req.key, req.id, secure)
+		if err != nil {
+			return nil, err
+		}
+
+		return reader.ReadConfig(cfg, secure)
+	}
+}
+
+func stateEndpoint(svc bootstrap.Service) endpoint.Endpoint {
+	return func(ctx context.Context, request interface{}) (interface{}, error) {
+		req := request.(changeStateReq)
+
+		if err := req.validate(); err != nil {
+			return nil, err
+		}
+
+		if err := svc.ChangeState(ctx, req.token, req.id, req.State); err != nil {
+			return nil, err
+		}
+
+		return stateRes{}, nil
+	}
+}
@@ -0,0 +1,196 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !test
+
+package api
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/mainflux/mainflux/bootstrap"
+	log "github.com/mainflux/mainflux/logger"
+)
+
+var _ bootstrap.Service = (*loggingMiddleware)(nil)
+
+type loggingMiddleware struct {
+	logger log.Logger
+	svc    bootstrap.Service
+}
+
+// NewLoggingMiddleware adds logging facilities to the core service.
+func NewLoggingMiddleware(svc bootstrap.Service, logger log.Logger) bootstrap.Service {
+	return &loggingMiddleware{logger, svc}
+}
+
+func (lm *loggingMiddleware) Add(ctx context.Context, token string, cfg bootstrap.Config) (saved bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method add for token %s and thing %s took %s to complete", token, saved.MFThing, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Add(ctx, token, cfg)
+}
+
+func (lm *loggingMiddleware) View(ctx context.Context, token, id string) (saved bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method view for token %s and thing %s took %s to complete", token, saved.MFThing, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.View(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) Update(ctx context.Context, token string, cfg bootstrap.Config) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method update for token %s and thing %s took %s to complete", token, cfg.MFThing, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Update(ctx, token, cfg)
+}
+
+func (lm *loggingMiddleware) UpdateCert(ctx context.Context, token, thingID, clientCert, clientKey, caCert string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method update_cert for thing with id %s took %s to complete", thingID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.UpdateCert(ctx, token, thingID, clientCert, clientKey, caCert)
+}
+
+func (lm *loggingMiddleware) UpdateConnections(ctx context.Context, token, id string, connections []string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method update_connections for token %s and thing %s took %s to complete", token, id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.UpdateConnections(ctx, token, id, connections)
+}
+
+func (lm *loggingMiddleware) List(ctx context.Context, token string, filter bootstrap.Filter, offset, limit uint64) (res bootstrap.ConfigsPage, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method list for token %s and offset %d and limit %d took %s to complete", token, offset, limit, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.List(ctx, token, filter, offset, limit)
+}
+
+func (lm *loggingMiddleware) Remove(ctx context.Context, token, id string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method remove for token %s and thing %s took %s to complete", token, id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Remove(ctx, token, id)
+}
+
+func (lm *loggingMiddleware) Bootstrap(ctx context.Context, externalKey, externalID string, secure bool) (cfg bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method bootstrap for thing with external id %s took %s to complete", externalID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.Bootstrap(ctx, externalKey, externalID, secure)
+}
+
+func (lm *loggingMiddleware) ChangeState(ctx context.Context, token, id string, state bootstrap.State) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method change_state for token %s and thing %s took %s to complete", token, id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.ChangeState(ctx, token, id, state)
+}
+
+func (lm *loggingMiddleware) UpdateChannelHandler(ctx context.Context, channel bootstrap.Channel) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method update_channel_handler for channel %s took %s to complete", channel.ID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.UpdateChannelHandler(ctx, channel)
+}
+
+func (lm *loggingMiddleware) RemoveConfigHandler(ctx context.Context, id string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method remove_config_handler for config %s took %s to complete", id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.RemoveConfigHandler(ctx, id)
+}
+
+func (lm *loggingMiddleware) RemoveChannelHandler(ctx context.Context, id string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method remove_channel_handler for channel %s took %s to complete", id, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.RemoveChannelHandler(ctx, id)
+}
+
+func (lm *loggingMiddleware) DisconnectThingHandler(ctx context.Context, channelID, thingID string) (err error) {
+	defer func(begin time.Time) {
+		message := fmt.Sprintf("Method disconnect_thing_handler for channel %s and thing %s took %s to complete", channelID, thingID, time.Since(begin))
+		if err != nil {
+			lm.logger.Warn(fmt.Sprintf("%s with error: %s.", message, err))
+			return
+		}
+		lm.logger.Info(fmt.Sprintf("%s without errors.", message))
+	}(time.Now())
+
+	return lm.svc.DisconnectThingHandler(ctx, channelID, thingID)
+}
@@ -0,0 +1,148 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+//go:build !test
+
+package api
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/metrics"
+	"github.com/mainflux/mainflux/bootstrap"
+)
+
+var _ bootstrap.Service = (*metricsMiddleware)(nil)
+
+type metricsMiddleware struct {
+	counter metrics.Counter
+	latency metrics.Histogram
+	svc     bootstrap.Service
+}
+
+// MetricsMiddleware instruments core service by tracking request count and latency.
+func MetricsMiddleware(svc bootstrap.Service, counter metrics.Counter, latency metrics.Histogram) bootstrap.Service {
+	return &metricsMiddleware{
+		counter: counter,
+		latency: latency,
+		svc:     svc,
+	}
+}
+
+func (mm *metricsMiddleware) Add(ctx context.Context, token string, cfg bootstrap.Config) (saved bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "add").Add(1)
+		mm.latency.With("method", "add").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.Add(ctx, token, cfg)
+}
+
+func (mm *metricsMiddleware) View(ctx context.Context, token, id string) (saved bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "view").Add(1)
+		mm.latency.With("method", "view").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.View(ctx, token, id)
+}
+
+func (mm *metricsMiddleware) Update(ctx context.Context, token string, cfg bootstrap.Config) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "update").Add(1)
+		mm.latency.With("method", "update").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.Update(ctx, token, cfg)
+}
+
+func (mm *metricsMiddleware) UpdateCert(ctx context.Context, token, thingKey, clientCert, clientKey, caCert string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "update_cert").Add(1)
+		mm.latency.With("method", "update_cert").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.UpdateCert(ctx, token, thingKey, clientCert, clientKey, caCert)
+}
+
+func (mm *metricsMiddleware) UpdateConnections(ctx context.Context, token, id string, connections []string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "update_connections").Add(1)
+		mm.latency.With("method", "update_connections").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.UpdateConnections(ctx, token, id, connections)
+}
+
+func (mm *metricsMiddleware) List(ctx context.Context, token string, filter bootstrap.Filter, offset, limit uint64) (saved bootstrap.ConfigsPage, err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "list").Add(1)
+		mm.latency.With("method", "list").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.List(ctx, token, filter, offset, limit)
+}
+
+func (mm *metricsMiddleware) Remove(ctx context.Context, token, id string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "remove").Add(1)
+		mm.latency.With("method", "remove").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.Remove(ctx, token, id)
+}
+
+func (mm *metricsMiddleware) Bootstrap(ctx context.Context, externalKey, externalID string, secure bool) (cfg bootstrap.Config, err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "bootstrap").Add(1)
+		mm.latency.With("method", "bootstrap").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.Bootstrap(ctx, externalKey, externalID, secure)
+}
+
+func (mm *metricsMiddleware) ChangeState(ctx context.Context, token, id string, state bootstrap.State) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "change_state").Add(1)
+		mm.latency.With("method", "change_state").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.ChangeState(ctx, token, id, state)
+}
+
+func (mm *metricsMiddleware) UpdateChannelHandler(ctx context.Context, channel bootstrap.Channel) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "update_channel").Add(1)
+		mm.latency.With("method", "update_channel").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.UpdateChannelHandler(ctx, channel)
+}
+
+func (mm *metricsMiddleware) RemoveConfigHandler(ctx context.Context, id string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "remove_config").Add(1)
+		mm.latency.With("method", "remove_config").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.RemoveConfigHandler(ctx, id)
+}
+
+func (mm *metricsMiddleware) RemoveChannelHandler(ctx context.Context, id string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "remove_channel").Add(1)
+		mm.latency.With("method", "remove_channel").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.RemoveChannelHandler(ctx, id)
+}
+
+func (mm *metricsMiddleware) DisconnectThingHandler(ctx context.Context, channelID, thingID string) (err error) {
+	defer func(begin time.Time) {
+		mm.counter.With("method", "disconnect_thing_handler").Add(1)
+		mm.latency.With("method", "disconnect_thing_handler").Observe(time.Since(begin).Seconds())
+	}(time.Now())
+
+	return mm.svc.DisconnectThingHandler(ctx, channelID, thingID)
+}
@@ -0,0 +1,177 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package api
+
+import (
+	"github.com/mainflux/mainflux/bootstrap"
+	"github.com/mainflux/mainflux/internal/apiutil"
+)
+
+const maxLimitSize = 100
+
+type apiReq interface {
+	validate() error
+}
+
+type addReq struct {
+	token       string
+	ThingID     string   `json:"thing_id"`
+	ExternalID  string   `json:"external_id"`
+	ExternalKey string   `json:"external_key"`
+	Channels    []string `json:"channels"`
+	Name        string   `json:"name"`
+	Content     string   `json:"content"`
+	ClientCert  string   `json:"client_cert"`
+	ClientKey   string   `json:"client_key"`
+	CACert      string   `json:"ca_cert"`
+}
+
+func (req addReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.ExternalID == "" {
+		return apiutil.ErrMissingID
+	}
+
+	if req.ExternalKey == "" {
+		return apiutil.ErrBearerKey
+	}
+
+	return nil
+}
+
+type entityReq struct {
+	token string
+	id    string
+}
+
+func (req entityReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type updateReq struct {
+	token   string
+	id      string
+	Name    string `json:"name"`
+	Content string `json:"content"`
+}
+
+func (req updateReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type updateCertReq struct {
+	token      string
+	thingID    string
+	ClientCert string `json:"client_cert"`
+	ClientKey  string `json:"client_key"`
+	CACert     string `json:"ca_cert"`
+}
+
+func (req updateCertReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.thingID == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type updateConnReq struct {
+	token    string
+	id       string
+	Channels []string `json:"channels"`
+}
+
+func (req updateConnReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type listReq struct {
+	token  string
+	filter bootstrap.Filter
+	offset uint64
+	limit  uint64
+}
+
+func (req listReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.limit > maxLimitSize {
+		return apiutil.ErrLimitSize
+	}
+
+	return nil
+}
+
+type bootstrapReq struct {
+	key string
+	id  string
+}
+
+func (req bootstrapReq) validate() error {
+	if req.key == "" {
+		return apiutil.ErrBearerKey
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	return nil
+}
+
+type changeStateReq struct {
+	token string
+	id    string
+	State bootstrap.State `json:"state"`
+}
+
+func (req changeStateReq) validate() error {
+	if req.token == "" {
+		return apiutil.ErrBearerToken
+	}
+
+	if req.id == "" {
+		return apiutil.ErrMissingID
+	}
+
+	if req.State != bootstrap.Inactive &&
+		req.State != bootstrap.Active {
+		return apiutil.ErrBootstrapState
+	}
+
+	return nil
+}
@@ -0,0 +1,298 @@
+package api
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/mainflux/mainflux/bootstrap"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAddReqValidation(t *testing.T) {
+	cases := []struct {
+		desc        string
+		token       string
+		externalID  string
+		externalKey string
+		err         error
+	}{
+		{
+			desc:        "empty key",
+			token:       "",
+			externalID:  "external-id",
+			externalKey: "external-key",
+			err:         apiutil.ErrBearerToken,
+		},
+		{
+			desc:        "empty external ID",
+			token:       "token",
+			externalID:  "",
+			externalKey: "external-key",
+			err:         apiutil.ErrMissingID,
+		},
+		{
+			desc:        "empty external key",
+			token:       "token",
+			externalID:  "external-id",
+			externalKey: "",
+			err:         apiutil.ErrBearerKey,
+		},
+	}
+
+	for _, tc := range cases {
+		req := addReq{
+			token:       tc.token,
+			ExternalID:  tc.externalID,
+			ExternalKey: tc.externalKey,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestEntityReqValidation(t *testing.T) {
+	cases := []struct {
+		desc  string
+		token string
+		id    string
+		err   error
+	}{
+		{
+			desc:  "empty token",
+			token: "",
+			id:    "id",
+			err:   apiutil.ErrBearerToken,
+		},
+		{
+			desc:  "empty id",
+			token: "token",
+			id:    "",
+			err:   apiutil.ErrMissingID,
+		},
+	}
+
+	for _, tc := range cases {
+		req := entityReq{
+			token: tc.token,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestUpdateReqValidation(t *testing.T) {
+	cases := []struct {
+		desc  string
+		token string
+		id    string
+		err   error
+	}{
+		{
+			desc:  "empty token",
+			token: "",
+			id:    "id",
+			err:   apiutil.ErrBearerToken,
+		},
+		{
+			desc:  "empty id",
+			token: "token",
+			id:    "",
+			err:   apiutil.ErrMissingID,
+		},
+	}
+
+	for _, tc := range cases {
+		req := updateReq{
+			token: tc.token,
+			id:    tc.id,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestUpdateCertReqValidation(t *testing.T) {
+	cases := []struct {
+		desc    string
+		token   string
+		thingID string
+		err     error
+	}{
+		{
+			desc:    "empty token",
+			token:   "",
+			thingID: "thingID",
+			err:     apiutil.ErrBearerToken,
+		},
+		{
+			desc:    "empty thing id",
+			token:   "token",
+			thingID: "",
+			err:     apiutil.ErrMissingID,
+		},
+	}
+
+	for _, tc := range cases {
+		req := updateCertReq{
+			token:   tc.token,
+			thingID: tc.thingID,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestUpdateConnReqValidation(t *testing.T) {
+	cases := []struct {
+		desc  string
+		token string
+		id    string
+		err   error
+	}{
+		{
+			desc:  "empty token",
+			token: "",
+			id:    "id",
+			err:   apiutil.ErrBearerToken,
+		},
+		{
+			desc:  "empty id",
+			token: "token",
+			id:    "",
+			err:   apiutil.ErrMissingID,
+		},
+	}
+
+	for _, tc := range cases {
+		req := updateReq{
+			token: tc.token,
+			id:    tc.id,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestListReqValidation(t *testing.T) {
+	cases := []struct {
+		desc   string
+		offset uint64
+		token  string
+		limit  uint64
+		err    error
+	}{
+		{
+			desc:   "empty token",
+			token:  "",
+			offset: 0,
+			limit:  1,
+			err:    apiutil.ErrBearerToken,
+		},
+		{
+			desc:   "too large limit",
+			token:  "token",
+			offset: 0,
+			limit:  maxLimitSize + 1,
+			err:    apiutil.ErrLimitSize,
+		},
+		{
+			desc:   "default limit",
+			token:  "token",
+			offset: 0,
+			limit:  defLimit,
+			err:    nil,
+		},
+	}
+
+	for _, tc := range cases {
+		req := listReq{
+			token:  tc.token,
+			offset: tc.offset,
+			limit:  tc.limit,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestBootstrapReqValidation(t *testing.T) {
+	cases := []struct {
+		desc      string
+		externKey string
+		externID  string
+		err       error
+	}{
+		{
+			desc:      "empty external key",
+			externKey: "",
+			externID:  "id",
+			err:       apiutil.ErrBearerKey,
+		},
+		{
+			desc:      "empty external id",
+			externKey: "key",
+			externID:  "",
+			err:       apiutil.ErrMissingID,
+		},
+	}
+
+	for _, tc := range cases {
+		req := bootstrapReq{
+			id:  tc.externID,
+			key: tc.externKey,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
+
+func TestChangeStateReqValidation(t *testing.T) {
+	cases := []struct {
+		desc  string
+		token string
+		id    string
+		state bootstrap.State
+		err   error
+	}{
+		{
+			desc:  "empty token",
+			token: "",
+			id:    "id",
+			state: bootstrap.State(1),
+			err:   apiutil.ErrBearerToken,
+		},
+		{
+			desc:  "empty id",
+			token: "token",
+			id:    "",
+			state: bootstrap.State(0),
+			err:   apiutil.ErrMissingID,
+		},
+		{
+			desc:  "invalid state",
+			token: "token",
+			id:    "id",
+			state: bootstrap.State(14),
+			err:   apiutil.ErrBootstrapState,
+		},
+	}
+
+	for _, tc := range cases {
+		req := changeStateReq{
+			token: tc.token,
+			id:    tc.id,
+			State: tc.state,
+		}
+
+		err := req.validate()
+		assert.Equal(t, tc.err, err, fmt.Sprintf("%s: expected %s got %s\n", tc.desc, tc.err, err))
+	}
+}
@@ -0,0 +1,123 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package api
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/bootstrap"
+)
+
+var (
+	_ mainflux.Response = (*removeRes)(nil)
+	_ mainflux.Response = (*configRes)(nil)
+	_ mainflux.Response = (*stateRes)(nil)
+	_ mainflux.Response = (*viewRes)(nil)
+	_ mainflux.Response = (*listRes)(nil)
+)
+
+type removeRes struct{}
+
+func (res removeRes) Code() int {
+	return http.StatusNoContent
+}
+
+func (res removeRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res removeRes) Empty() bool {
+	return true
+}
+
+type configRes struct {
+	id      string
+	created bool
+}
+
+func (res configRes) Code() int {
+	if res.created {
+		return http.StatusCreated
+	}
+
+	return http.StatusOK
+}
+
+func (res configRes) Headers() map[string]string {
+	if res.created {
+		return map[string]string{
+			"Location": fmt.Sprintf("/things/configs/%s", res.id),
+		}
+	}
+
+	return map[string]string{}
+}
+
+func (res configRes) Empty() bool {
+	return true
+}
+
+type channelRes struct {
+	ID       string      `json:"id"`
+	Name     string      `json:"name,omitempty"`
+	Metadata interface{} `json:"metadata,omitempty"`
+}
+
+type viewRes struct {
+	MFThing     string          `json:"mainflux_id,omitempty"`
+	MFKey       string          `json:"mainflux_key,omitempty"`
+	Channels    []channelRes    `json:"mainflux_channels,omitempty"`
+	ExternalID  string          `json:"external_id"`
+	ExternalKey string          `json:"external_key,omitempty"`
+	Content     string          `json:"content,omitempty"`
+	Name        string          `json:"name,omitempty"`
+	State       bootstrap.State `json:"state"`
+}
+
+func (res viewRes) Code() int {
+	return http.StatusOK
+}
+
+func (res viewRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res viewRes) Empty() bool {
+	return false
+}
+
+type listRes struct {
+	Total   uint64    `json:"total"`
+	Offset  uint64    `json:"offset"`
+	Limit   uint64    `json:"limit"`
+	Configs []viewRes `json:"configs"`
+}
+
+func (res listRes) Code() int {
+	return http.StatusOK
+}
+
+func (res listRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res listRes) Empty() bool {
+	return false
+}
+
+type stateRes struct{}
+
+func (res stateRes) Code() int {
+	return http.StatusOK
+}
+
+func (res stateRes) Headers() map[string]string {
+	return map[string]string{}
+}
+
+func (res stateRes) Empty() bool {
+	return true
+}
@@ -0,0 +1,325 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package api
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"strings"
+
+	kithttp "github.com/go-kit/kit/transport/http"
+	"github.com/go-zoo/bone"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/bootstrap"
+	"github.com/mainflux/mainflux/internal/apiutil"
+	"github.com/mainflux/mainflux/logger"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	contentType = "application/json"
+	offsetKey   = "offset"
+	limitKey    = "limit"
+	defOffset   = 0
+	defLimit    = 10
+)
+
+var (
+	fullMatch    = []string{"state", "external_id", "mainflux_id", "mainflux_key"}
+	partialMatch = []string{"name"}
+)
+
+// MakeHandler returns a HTTP handler for API endpoints.
+func MakeHandler(svc bootstrap.Service, reader bootstrap.ConfigReader, logger logger.Logger) http.Handler {
+	opts := []kithttp.ServerOption{
+		kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
+	}
+	r := bone.New()
+
+	r.Post("/things/configs", kithttp.NewServer(
+		addEndpoint(svc),
+		decodeAddRequest,
+		encodeResponse,
+		opts...))
+
+	r.Get("/things/configs/:id", kithttp.NewServer(
+		viewEndpoint(svc),
+		decodeEntityRequest,
+		encodeResponse,
+		opts...))
+
+	r.Put("/things/configs/:id", kithttp.NewServer(
+		updateEndpoint(svc),
+		decodeUpdateRequest,
+		encodeResponse,
+		opts...))
+
+	r.Patch("/things/configs/certs/:id", kithttp.NewServer(
+		updateCertEndpoint(svc),
+		decodeUpdateCertRequest,
+		encodeResponse,
+		opts...))
+
+	r.Put("/things/configs/connections/:id", kithttp.NewServer(
+		updateConnEndpoint(svc),
+		decodeUpdateConnRequest,
+		encodeResponse,
+		opts...))
+
+	r.Get("/things/configs", kithttp.NewServer(
+		listEndpoint(svc),
+		decodeListRequest,
+		encodeResponse,
+		opts...))
+
+	r.Get("/things/bootstrap/:external_id", kithttp.NewServer(
+		bootstrapEndpoint(svc, reader, false),
+		decodeBootstrapRequest,
+		encodeResponse,
+		opts...))
+
+	r.Get("/things/bootstrap/secure/:external_id", kithttp.NewServer(
+		bootstrapEndpoint(svc, reader, true),
+		decodeBootstrapRequest,
+		encodeSecureRes,
+		opts...))
+
+	r.Put("/things/state/:id", kithttp.NewServer(
+		stateEndpoint(svc),
+		decodeStateRequest,
+		encodeResponse,
+		opts...))
+
+	r.Delete("/things/configs/:id", kithttp.NewServer(
+		removeEndpoint(svc),
+		decodeEntityRequest,
+		encodeResponse,
+		opts...))
+
+	r.GetFunc("/health", mainflux.Health("bootstrap"))
+	r.Handle("/metrics", promhttp.Handler())
+
+	return r
+}
+
+func decodeAddRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := addReq{token: apiutil.ExtractBearerToken(r)}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeUpdateRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := updateReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "id"),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeUpdateCertRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := updateCertReq{
+		token:   apiutil.ExtractBearerToken(r),
+		thingID: bone.GetValue(r, "id"),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeUpdateConnRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := updateConnReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "id"),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeListRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	o, err := apiutil.ReadUintQuery(r, offsetKey, defOffset)
+	if err != nil {
+		return nil, err
+	}
+
+	l, err := apiutil.ReadUintQuery(r, limitKey, defLimit)
+	if err != nil {
+		return nil, err
+	}
+
+	q, err := url.ParseQuery(r.URL.RawQuery)
+	if err != nil {
+		return nil, errors.ErrInvalidQueryParams
+	}
+
+	req := listReq{
+		token:  apiutil.ExtractBearerToken(r),
+		filter: parseFilter(q),
+		offset: o,
+		limit:  l,
+	}
+
+	return req, nil
+}
+
+func decodeBootstrapRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	req := bootstrapReq{
+		id:  bone.GetValue(r, "external_id"),
+		key: apiutil.ExtractThingKey(r),
+	}
+
+	return req, nil
+}
+
+func decodeStateRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), contentType) {
+		return nil, errors.ErrUnsupportedContentType
+	}
+
+	req := changeStateReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "id"),
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		return nil, errors.Wrap(errors.ErrMalformedEntity, err)
+	}
+
+	return req, nil
+}
+
+func decodeEntityRequest(_ context.Context, r *http.Request) (interface{}, error) {
+	req := entityReq{
+		token: apiutil.ExtractBearerToken(r),
+		id:    bone.GetValue(r, "id"),
+	}
+
+	return req, nil
+}
+
+func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
+	w.Header().Set("Content-Type", contentType)
+	if ar, ok := response.(mainflux.Response); ok {
+		for k, v := range ar.Headers() {
+			w.Header().Set(k, v)
+		}
+
+		w.WriteHeader(ar.Code())
+
+		if ar.Empty() {
+			return nil
+		}
+	}
+
+	return json.NewEncoder(w).Encode(response)
+}
+
+func encodeSecureRes(_ context.Context, w http.ResponseWriter, response interface{}) error {
+	w.Header().Set("Content-Type", contentType)
+	w.WriteHeader(http.StatusOK)
+	if b, ok := response.([]byte); ok {
+		if _, err := w.Write(b); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func encodeError(_ context.Context, err error, w http.ResponseWriter) {
+	switch {
+	case errors.Contains(err, errors.ErrAuthentication),
+		err == apiutil.ErrBearerToken,
+		err == apiutil.ErrBearerKey:
+		w.WriteHeader(http.StatusUnauthorized)
+	case errors.Contains(err, errors.ErrUnsupportedContentType):
+		w.WriteHeader(http.StatusUnsupportedMediaType)
+	case errors.Contains(err, errors.ErrInvalidQueryParams),
+		errors.Contains(err, errors.ErrMalformedEntity),
+		err == apiutil.ErrMissingID,
+		err == apiutil.ErrBootstrapState,
+		err == apiutil.ErrLimitSize:
+		w.WriteHeader(http.StatusBadRequest)
+	case errors.Contains(err, errors.ErrNotFound):
+		w.WriteHeader(http.StatusNotFound)
+	case errors.Contains(err, bootstrap.ErrExternalKey),
+		errors.Contains(err, bootstrap.ErrExternalKeySecure),
+		errors.Contains(err, errors.ErrAuthorization):
+		w.WriteHeader(http.StatusForbidden)
+	case errors.Contains(err, errors.ErrConflict):
+		w.WriteHeader(http.StatusConflict)
+	case errors.Contains(err, bootstrap.ErrThings):
+		w.WriteHeader(http.StatusServiceUnavailable)
+
+	case errors.Contains(err, errors.ErrCreateEntity),
+		errors.Contains(err, errors.ErrUpdateEntity),
+		errors.Contains(err, errors.ErrViewEntity),
+		errors.Contains(err, errors.ErrRemoveEntity):
+		w.WriteHeader(http.StatusInternalServerError)
+
+	default:
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	if errorVal, ok := err.(errors.Error); ok {
+		w.Header().Set("Content-Type", contentType)
+		if err := json.NewEncoder(w).Encode(apiutil.ErrorRes{Err: errorVal.Msg()}); err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
+	}
+}
+
+func parseFilter(values url.Values) bootstrap.Filter {
+	ret := bootstrap.Filter{
+		FullMatch:    make(map[string]string),
+		PartialMatch: make(map[string]string),
+	}
+	for k := range values {
+		if contains(fullMatch, k) {
+			ret.FullMatch[k] = values.Get(k)
+		}
+		if contains(partialMatch, k) {
+			ret.PartialMatch[k] = strings.ToLower(values.Get(k))
+		}
+	}
+
+	return ret
+}
+
+func contains(l []string, s string) bool {
+	for _, v := range l {
+		if v == s {
+			return true
+		}
+	}
+	return false
+}
@@ -0,0 +1,102 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package bootstrap
+
+// Config represents Configuration entity. It wraps information about external entity
+// as well as info about corresponding Mainflux entities.
+// MFThing represents corresponding Mainflux Thing ID.
+// MFKey is key of corresponding Mainflux Thing.
+// MFChannels is a list of Mainflux Channels corresponding Mainflux Thing connects to.
+type Config struct {
+	MFThing     string
+	Owner       string
+	Name        string
+	ClientCert  string
+	ClientKey   string
+	CACert      string
+	MFKey       string
+	MFChannels  []Channel
+	ExternalID  string
+	ExternalKey string
+	Content     string
+	State       State
+}
+
+// Channel represents Mainflux channel corresponding Mainflux Thing is connected to.
+type Channel struct {
+	ID       string
+	Name     string
+	Metadata map[string]interface{}
+}
+
+// Filter is used for the search filters.
+type Filter struct {
+	FullMatch    map[string]string
+	PartialMatch map[string]string
+}
+
+// ConfigsPage contains page related metadata as well as list of Configs that
+// belong to this page.
+type ConfigsPage struct {
+	Total   uint64
+	Offset  uint64
+	Limit   uint64
+	Configs []Config
+}
+
+// ConfigRepository specifies a Config persistence API.
+type ConfigRepository interface {
+	// Save persists the Config. Successful operation is indicated by non-nil
+	// error response.
+	Save(cfg Config, chsConnIDs []string) (string, error)
+
+	// RetrieveByID retrieves the Config having the provided identifier, that is owned
+	// by the specified user.
+	RetrieveByID(owner, id string) (Config, error)
+
+	// RetrieveAll retrieves a subset of Configs that are owned
+	// by the specific user, with given filter parameters.
+	RetrieveAll(owner string, filter Filter, offset, limit uint64) ConfigsPage
+
+	// RetrieveByExternalID returns Config for given external ID.
+	RetrieveByExternalID(externalID string) (Config, error)
+
+	// Update updates an existing Config. A non-nil error is returned
+	// to indicate operation failure.
+	Update(cfg Config) error
+
+	// UpdateCerts updates an existing Config certificate and owner.
+	// A non-nil error is returned to indicate operation failure.
+	UpdateCert(owner, thingID, clientCert, clientKey, caCert string) error
+
+	// UpdateConnections updates a list of Channels the Config is connected to
+	// adding new Channels if needed.
+	UpdateConnections(owner, id string, channels []Channel, connections []string) error
+
+	// Remove removes the Config having the provided identifier, that is owned
+	// by the specified user.
+	Remove(owner, id string) error
+
+	// ChangeState changes of the Config, that is owned by the specific user.
+	ChangeState(owner, id string, state State) error
+
+	// ListExisting retrieves those channels from the given list that exist in DB.
+	ListExisting(owner string, ids []string) ([]Channel, error)
+
+	// Methods RemoveThing, UpdateChannel, and RemoveChannel are related to
+	// event sourcing. That's why these methods surpass ownership check.
+
+	// RemoveThing removes Config of the Thing with the given ID.
+	RemoveThing(id string) error
+
+	// UpdateChannel updates channel with the given ID.
+	UpdateChannel(c Channel) error
+
+	// RemoveChannel removes channel with the given ID.
+	RemoveChannel(id string) error
+
+	// DisconnectHandler changes state of the Config when the corresponding Thing is
+	// disconnected from the Channel.
+	DisconnectThing(channelID, thingID string) error
+}
@@ -0,0 +1,6 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+// Package bootstrap contains the domain concept definitions needed to support
+// Mainflux bootstrap service functionality.
+package bootstrap
@@ -0,0 +1,309 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/mainflux/mainflux/bootstrap"
+	"github.com/mainflux/mainflux/pkg/errors"
+)
+
+const (
+	emptyState  = -1
+	notFoundIdx = -1
+)
+
+var _ bootstrap.ConfigRepository = (*configRepositoryMock)(nil)
+
+type configRepositoryMock struct {
+	mu       sync.Mutex
+	counter  uint64
+	configs  map[string]bootstrap.Config
+	channels map[string]bootstrap.Channel
+}
+
+// NewConfigsRepository creates in-memory config repository.
+func NewConfigsRepository() bootstrap.ConfigRepository {
+	return &configRepositoryMock{
+		configs:  make(map[string]bootstrap.Config),
+		channels: make(map[string]bootstrap.Channel),
+	}
+}
+
+func (crm *configRepositoryMock) Save(config bootstrap.Config, connections []string) (string, error) {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	for _, v := range crm.configs {
+		if v.MFThing == config.MFThing || v.ExternalID == config.ExternalID {
+			return "", errors.ErrConflict
+		}
+	}
+
+	crm.counter++
+	config.MFThing = strconv.FormatUint(crm.counter, 10)
+	crm.configs[config.MFThing] = config
+
+	for _, ch := range config.MFChannels {
+		crm.channels[ch.ID] = ch
+	}
+
+	config.MFChannels = []bootstrap.Channel{}
+
+	for _, ch := range connections {
+		config.MFChannels = append(config.MFChannels, crm.channels[ch])
+	}
+
+	crm.configs[config.MFThing] = config
+
+	return config.MFThing, nil
+}
+
+func (crm *configRepositoryMock) RetrieveByID(token, id string) (bootstrap.Config, error) {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	c, ok := crm.configs[id]
+	if !ok {
+		return bootstrap.Config{}, errors.ErrNotFound
+	}
+	if c.Owner != token {
+		return bootstrap.Config{}, errors.ErrAuthentication
+	}
+
+	return c, nil
+
+}
+
+func (crm *configRepositoryMock) RetrieveAll(token string, filter bootstrap.Filter, offset, limit uint64) bootstrap.ConfigsPage {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	configs := make([]bootstrap.Config, 0)
+
+	if offset < 0 || limit <= 0 {
+		return bootstrap.ConfigsPage{}
+	}
+
+	first := uint64(offset) + 1
+	last := first + uint64(limit)
+	var state bootstrap.State = emptyState
+	var name string
+	if s, ok := filter.FullMatch["state"]; ok {
+		val, _ := strconv.Atoi(s)
+		state = bootstrap.State(val)
+	}
+
+	if s, ok := filter.PartialMatch["name"]; ok {
+		name = strings.ToLower(s)
+	}
+
+	var total uint64
+	for _, v := range crm.configs {
+		id, _ := strconv.ParseUint(v.MFThing, 10, 64)
+		if (state == emptyState || v.State == state) &&
+			(name == "" || strings.Index(strings.ToLower(v.Name), name) != notFoundIdx) &&
+			v.Owner == token {
+			if id >= first && id < last {
+				configs = append(configs, v)
+			}
+			total++
+		}
+	}
+
+	sort.SliceStable(configs, func(i, j int) bool {
+		return configs[i].MFThing < configs[j].MFThing
+	})
+
+	return bootstrap.ConfigsPage{
+		Total:   total,
+		Offset:  offset,
+		Limit:   limit,
+		Configs: configs,
+	}
+}
+
+func (crm *configRepositoryMock) RetrieveByExternalID(externalID string) (bootstrap.Config, error) {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	for _, cfg := range crm.configs {
+		if cfg.ExternalID == externalID {
+			return cfg, nil
+		}
+	}
+
+	return bootstrap.Config{}, errors.ErrNotFound
+}
+
+func (crm *configRepositoryMock) Update(config bootstrap.Config) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	cfg, ok := crm.configs[config.MFThing]
+	if !ok || cfg.Owner != config.Owner {
+		return errors.ErrNotFound
+	}
+
+	cfg.Name = config.Name
+	cfg.Content = config.Content
+	crm.configs[config.MFThing] = cfg
+
+	return nil
+}
+
+func (crm *configRepositoryMock) UpdateCert(owner, thingID, clientCert, clientKey, caCert string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+	var forUpdate bootstrap.Config
+	for _, v := range crm.configs {
+		if v.MFThing == thingID && v.Owner == owner {
+			forUpdate = v
+			break
+		}
+	}
+	if _, ok := crm.configs[forUpdate.MFThing]; !ok {
+		return errors.ErrNotFound
+	}
+	forUpdate.ClientCert = clientCert
+	forUpdate.ClientKey = clientKey
+	forUpdate.CACert = caCert
+	crm.configs[forUpdate.MFThing] = forUpdate
+
+	return nil
+}
+
+func (crm *configRepositoryMock) UpdateConnections(token, id string, channels []bootstrap.Channel, connections []string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	config, ok := crm.configs[id]
+	if !ok {
+		return errors.ErrNotFound
+	}
+
+	for _, ch := range channels {
+		crm.channels[ch.ID] = ch
+	}
+
+	config.MFChannels = []bootstrap.Channel{}
+	for _, conn := range connections {
+		ch, ok := crm.channels[conn]
+		if !ok {
+			return errors.ErrNotFound
+		}
+		config.MFChannels = append(config.MFChannels, ch)
+	}
+	crm.configs[id] = config
+
+	return nil
+}
+
+func (crm *configRepositoryMock) Remove(token, id string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	for k, v := range crm.configs {
+		if v.Owner == token && k == id {
+			delete(crm.configs, k)
+			break
+		}
+	}
+
+	return nil
+}
+
+func (crm *configRepositoryMock) ChangeState(token, id string, state bootstrap.State) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	config, ok := crm.configs[id]
+	if !ok {
+		return errors.ErrNotFound
+	}
+	if config.Owner != token {
+		return errors.ErrAuthentication
+	}
+
+	config.State = state
+	crm.configs[id] = config
+	return nil
+}
+
+func (crm *configRepositoryMock) ListExisting(token string, connections []string) ([]bootstrap.Channel, error) {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	var ret []bootstrap.Channel
+
+	for k, v := range crm.channels {
+		for _, conn := range connections {
+			if conn == k {
+				ret = append(ret, v)
+				break
+			}
+		}
+	}
+
+	return ret, nil
+}
+
+func (crm *configRepositoryMock) RemoveThing(id string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	delete(crm.configs, id)
+	return nil
+}
+
+func (crm *configRepositoryMock) UpdateChannel(ch bootstrap.Channel) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	channel, ok := crm.channels[ch.ID]
+	if !ok {
+		return nil
+	}
+
+	channel.Name = ch.Name
+	channel.Metadata = ch.Metadata
+	crm.channels[ch.ID] = channel
+	return nil
+}
+
+func (crm *configRepositoryMock) RemoveChannel(id string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	delete(crm.channels, id)
+	return nil
+}
+
+func (crm *configRepositoryMock) DisconnectThing(channelID, thingID string) error {
+	crm.mu.Lock()
+	defer crm.mu.Unlock()
+
+	idx := -1
+	if config, ok := crm.configs[thingID]; ok {
+		for i, ch := range config.MFChannels {
+			if ch.ID == channelID {
+				idx = i
+				break
+			}
+		}
+
+		if idx != -1 {
+			config.MFChannels = append(config.MFChannels[0:idx], config.MFChannels[idx:]...)
+		}
+		crm.configs[thingID] = config
+	}
+
+	delete(crm.channels, channelID)
+
+	return nil
+}
@@ -0,0 +1,248 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"context"
+	"strconv"
+	"sync"
+
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"github.com/mainflux/mainflux/things"
+)
+
+var _ things.Service = (*mainfluxThings)(nil)
+
+type mainfluxThings struct {
+	mu          sync.Mutex
+	counter     uint64
+	things      map[string]things.Thing
+	channels    map[string]things.Channel
+	auth        mainflux.AuthServiceClient
+	connections map[string][]string
+}
+
+// NewThingsService returns Mainflux Things service mock.
+// Only methods used by SDK are mocked.
+func NewThingsService(things map[string]things.Thing, channels map[string]things.Channel, auth mainflux.AuthServiceClient) things.Service {
+	return &mainfluxThings{
+		things:      things,
+		channels:    channels,
+		auth:        auth,
+		connections: make(map[string][]string),
+	}
+}
+
+func (svc *mainfluxThings) CreateThings(_ context.Context, owner string, ths ...things.Thing) ([]things.Thing, error) {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return []things.Thing{}, errors.ErrAuthentication
+	}
+	for i := range ths {
+		svc.counter++
+		ths[i].Owner = userID.Email
+		ths[i].ID = strconv.FormatUint(svc.counter, 10)
+		ths[i].Key = ths[i].ID
+		svc.things[ths[i].ID] = ths[i]
+	}
+
+	return ths, nil
+}
+
+func (svc *mainfluxThings) ViewThing(_ context.Context, owner, id string) (things.Thing, error) {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return things.Thing{}, errors.ErrAuthentication
+	}
+
+	if t, ok := svc.things[id]; ok && t.Owner == userID.Email {
+		return t, nil
+
+	}
+
+	return things.Thing{}, errors.ErrNotFound
+}
+
+func (svc *mainfluxThings) Connect(_ context.Context, owner string, chIDs, thIDs []string) error {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return errors.ErrAuthentication
+	}
+	for _, chID := range chIDs {
+		if svc.channels[chID].Owner != userID.Email {
+			return errors.ErrAuthentication
+		}
+		for _, thID := range thIDs {
+			svc.connections[chID] = append(svc.connections[chID], thID)
+		}
+	}
+
+	return nil
+}
+
+func (svc *mainfluxThings) Disconnect(_ context.Context, owner string, chIDs, thIDs []string) error {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return errors.ErrAuthentication
+	}
+
+	for _, chID := range chIDs {
+		if svc.channels[chID].Owner != userID.Email {
+			return errors.ErrAuthentication
+		}
+
+		ids := svc.connections[chID]
+		var count int
+		var newConns []string
+		for _, thID := range thIDs {
+			for _, id := range ids {
+				if id == thID {
+					count++
+					continue
+				}
+				newConns = append(newConns, id)
+			}
+
+			if len(newConns)-len(ids) != count {
+				return errors.ErrNotFound
+			}
+			svc.connections[chID] = newConns
+		}
+	}
+	return nil
+}
+
+func (svc *mainfluxThings) RemoveThing(_ context.Context, owner, id string) error {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return errors.ErrAuthentication
+	}
+
+	if t, ok := svc.things[id]; !ok || t.Owner != userID.Email {
+		return errors.ErrNotFound
+	}
+
+	delete(svc.things, id)
+	conns := make(map[string][]string)
+	for k, v := range svc.connections {
+		i := findIndex(v, id)
+		if i != -1 {
+			var tmp []string
+			if i != len(v)-2 {
+				tmp = v[i+1:]
+			}
+			conns[k] = append(v[:i], tmp...)
+		}
+	}
+
+	svc.connections = conns
+	return nil
+}
+
+func (svc *mainfluxThings) ViewChannel(_ context.Context, owner, id string) (things.Channel, error) {
+	if c, ok := svc.channels[id]; ok {
+		return c, nil
+	}
+	return things.Channel{}, errors.ErrNotFound
+}
+
+func (svc *mainfluxThings) UpdateThing(context.Context, string, things.Thing) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) UpdateKey(context.Context, string, string, string) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) ListThings(context.Context, string, things.PageMetadata) (things.Page, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) ListChannelsByThing(context.Context, string, string, things.PageMetadata) (things.ChannelsPage, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) ListThingsByChannel(context.Context, string, string, things.PageMetadata) (things.Page, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) CreateChannels(_ context.Context, owner string, chs ...things.Channel) ([]things.Channel, error) {
+	svc.mu.Lock()
+	defer svc.mu.Unlock()
+
+	userID, err := svc.auth.Identify(context.Background(), &mainflux.Token{Value: owner})
+	if err != nil {
+		return []things.Channel{}, errors.ErrAuthentication
+	}
+	for i := range chs {
+		svc.counter++
+		chs[i].Owner = userID.Email
+		chs[i].ID = strconv.FormatUint(svc.counter, 10)
+		svc.channels[chs[i].ID] = chs[i]
+	}
+
+	return chs, nil
+}
+
+func (svc *mainfluxThings) UpdateChannel(context.Context, string, things.Channel) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) ListChannels(context.Context, string, things.PageMetadata) (things.ChannelsPage, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) RemoveChannel(context.Context, string, string) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) CanAccessByKey(context.Context, string, string) (string, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) CanAccessByID(context.Context, string, string) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) IsChannelOwner(context.Context, string, string) error {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) Identify(context.Context, string) (string, error) {
+	panic("not implemented")
+}
+
+func (svc *mainfluxThings) ShareThing(ctx context.Context, token, thingID string, actions, userIDs []string) error {
+	panic("not implemented")
+}
+
+func findIndex(list []string, val string) int {
+	for i, v := range list {
+		if v == val {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func (svc *mainfluxThings) ListMembers(ctx context.Context, token, groupID string, pm things.PageMetadata) (things.Page, error) {
+	panic("not implemented")
+}
@@ -0,0 +1,65 @@
+// Copyright (c) Mainflux
+// SPDX-License-Identifier: Apache-2.0
+
+package mocks
+
+import (
+	"context"
+
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/mainflux/mainflux"
+	"github.com/mainflux/mainflux/pkg/errors"
+	"google.golang.org/grpc"
+)
+
+var _ mainflux.AuthServiceClient = (*serviceMock)(nil)
+
+type serviceMock struct {
+	users map[string]string
+}
+
+// NewAuthClient creates mock of users service.
+func NewAuthClient(users map[string]string) mainflux.AuthServiceClient {
+	return &serviceMock{users}
+}
+
+func (svc serviceMock) Identify(ctx context.Context, in *mainflux.Token, opts ...grpc.CallOption) (*mainflux.UserIdentity, error) {
+	if id, ok := svc.users[in.Value]; ok {
+		return &mainflux.UserIdentity{Email: id, Id: id}, nil
+	}
+	return nil, errors.ErrAuthentication
+}
+
+func (svc serviceMock) Issue(ctx context.Context, in *mainflux.IssueReq, opts ...grpc.CallOption) (*mainflux.Token, error) {
+	if id, ok := svc.users[in.GetEmail()]; ok {
+		switch in.Type {
+		default:
+			return &mainflux.Token{Value: id}, nil
+		}
+	}
+	return nil, errors.ErrAuthentication
+}
+
+func (svc serviceMock) Authorize(ctx context.Context, req *mainflux.AuthorizeReq, _ ...grpc.CallOption) (r *mainflux.AuthorizeRes, err error) {
+	panic("not implemented")
+}
+
+func (svc serviceMock) AddPolicy(ctx context.Context, in *mainflux.AddPolicyReq, opts ...grpc.CallOption) (*mainflux.AddPolicyRes, error) {
+	panic("not implemented")
+}
+
+func (svc serviceMock) DeletePolicy(ctx context.Context, in *mainflux.DeletePolicyReq, opts ...grpc.CallOption) (*mainflux.DeletePolicyRes, error) {
+	panic("not implemented")
+}
+
+func (svc serviceMock) ListPolicies(ctx context.Context, in *mainflux.ListPoliciesReq, opts ...grpc.CallOption) (*mainflux.ListPoliciesRes, error) {
+	panic("not implemented")
+}
+
+func (svc serviceMock) Members(ctx context.Context, req *mainflux.MembersReq, _ ...grpc.CallOption) (r *mainflux.MembersRes, err error) {
+	panic("not implemented")
+}
+
+func (svc serviceMock) Assign(ctx context.Context, req *mainflux.Assignment, _ ...grpc.CallOption) (r *empty.Empty, err error) {
+	panic("not implemented")
+}
--- a/Show More
+++ b/Show More