fastapi-keycloak-oidc

This is example of how to use Keycloak on Fastapi.

It is useful for those who want to use JWT tokens and don't want to use Keycloak SDK in the backend.

Prerequisites

Run keycloak

docker run -p 8080:8080 -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin jboss/keycloak

Create client on Keycloak

We are creating client for testing and getting JWT tokens.

Go to http://localhost:8080/auth/
Login with admin/admin
Go to Clients section on sidebar
Click Create button
Fill Client ID as login-app
Click Save button

Install dependencies

pip install -r requirements.txt

Testing

Run python code

python starter.py`

Run curl on secured endpoint

curl localhost:8000/users/me/items/

which will gives following error

{"detail":"Not authenticated"}

Get token from Keycloak

curl --request POST 'http://localhost:8080/auth/realms/master/protocol/openid-connect/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'client_id=login-app' \
--data-urlencode 'username=admin' \
--data-urlencode 'password=admin' \
--data-urlencode 'grant_type=password'

which will give following

{
  "access_token": "eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJQUEZ2V3dSQy1RTjNFaFlqWlQ4NFAzeTEwRU5fWC1CTnE2NzI3MWdsZ21RIn0.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.0e6DiKHrLSFcmd9HCDu7E1g8o19hR3xc6IzMViO06mp1h5C2U7HjJDAWlUN2dk7VilWolze9i_w9r8ggyZ7FvmPRZ-v8gohDMJLS2xgt0GmvKEjcH2Kh2GMtaGXrG4y4AkAYytqDCO7p04pHPZT_tBsReO3WH4EAtsAcG4NrCPvtkkPGj7SFuzQQm9boEV9dsTX4UXeebabUQGr_KAhpcRyAtqPhgKqsmmupsUeWfVdPz1MiyD0DMcLaI4BOCMTUQA_lMjZDdu0GifhAiWfU_1ewDXcMlOYpIFoB_F-6101QKbSDswzrw4cciHIQt2Le1uZhm0UE6MNU2iIOy6a5RQ",
  "expires_in": 60,
  "refresh_expires_in": 1800,
  "refresh_token": "eyJhbGciOiJIUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICI5ZjJjZmI3Zi00MThkLTRkMTUtYWM2OC1kM2E4YmQ0NDRlZWEifQ.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.e8ONRUVnaBbTASqIbpr5iqaYEjFY-XTI-zI_59Gun84",
  "token_type": "bearer",
  "not-before-policy": 0,
  "session_state": "0b936f78-93cd-4030-91ad-2aca952a1a7b",
  "scope": "email profile"
}

Run curl again on secured endpoint but with token now

curl localhost:8000/users/me/items/ --header 'Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJQUEZ2V3dSQy1RTjNFaFlqWlQ4NFAzeTEwRU5fWC1CTnE2NzI3MWdsZ21RIn0.eyJqdGkiOiJmYTQ1NGY3ZC1lNWJjLTQ4ZTQtYWI3My1hOGRmNDc5ODM2NGEiLCJleHAiOjE2MTg5OTMxMDksIm5iZiI6MCwiaWF0IjoxNjE4OTkzMDQ5LCJpc3MiOiJodHRwOi8vbG9jYWxob3N0OjgwODAvYXV0aC9yZWFsbXMvbWFzdGVyIiwiYXVkIjoiYWNjb3VudCIsInN1YiI6IjljNWYxZDM1LWNhZGItNGVlNS04MmZkLWY0NGU3MThmODIxNCIsInR5cCI6IkJlYXJlciIsImF6cCI6ImxvZ2luLWFwcCIsImF1dGhfdGltZSI6MCwic2Vzc2lvbl9zdGF0ZSI6ImVjYmNiNjZlLTRlODUtNDFhOS04NTIyLWNiNWU0ZjBiZDQwZSIsImFjciI6IjEiLCJyZWFsbV9hY2Nlc3MiOnsicm9sZXMiOlsib2ZmbGluZV9hY2Nlc3MiLCJ1bWFfYXV0aG9yaXphdGlvbiIsInN5c3RlbV91c2VyIl19LCJyZXNvdXJjZV9hY2Nlc3MiOnsiYWNjb3VudCI6eyJyb2xlcyI6WyJtYW5hZ2UtYWNjb3VudCIsIm1hbmFnZS1hY2NvdW50LWxpbmtzIiwidmlldy1wcm9maWxlIl19fSwic2NvcGUiOiJlbWFpbCBwcm9maWxlIiwiZW1haWxfdmVyaWZpZWQiOmZhbHNlLCJwcmVmZXJyZWRfdXNlcm5hbWUiOiJzaW1wbGVfdXNlciJ9.XraITtlc8QwesbSi6YjqindLWY7NtPj-_VTHdhuCLAdmUIbW03G2A8C-23GMVdvVS2X7ZnZiW2I7nZ3jRx5EKt9yVxm23gKq0JSL3520y30a-5iHWXy6Ld52aym8lAwKvBP0KODf4yEF1C55iYK6fOyna5Wn3ytdHnO3HPOVzUREsnTsC4q3J2TnGDZR3DQ8IgsEOwADqzwFxmSAdUag6W20eGo_Y9ljbWVffwwJJHJvNdCM3__7QfgmmG4vv8SQypebjmX3FUqUTCu8y4Z9ED2Qox-b_CLlxhHLjQIwwWgOzfiVEKjcLJm6f2qXmwvJzrfguWV2Bxi0VF-e-RDITg'

which will give following

[{"item_id":"Foo","owner":"admin"}]

Notes

If you look at code at main.py, you will see that we didn't use Keycloak SDK
On start it fetches public key from http://localhost:8080/auth/realms/master which gives us following

{
  "realm": "master",
  "public_key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA8PtFbgQHNhn8WrgOfVVb/a1qV87vR7R2t0jO5fAJqKq24+pVrYw7D38Qh/O2HjWPVrPRzEBiUE61poUqEJfVjclSqJoqXLhTMOm1NRbpfzf1Nid+uZfJ4B5JtA/yNLpY13s9+4F77FjCmA0fmNAnaxRJ26a7bFYacl7+rcZqPD9zl+FKfta5vKw5onwz0aTVQLgYZ4Ysmehr+f6z4cKgY2+z7IpQOELXFyWktWPiOtkL/Q6mBPr/mHqhQ7ARmlOM6DC5Babb7y4H3U4fRIO9ByPAMQMTtjvmL9NlrqSw+51s6GPGqtlJegi2jW4vIOSOOOHJH0OhTDWOyQHrp3XRIQIDAQAB",
  "token-service": "http://localhost:8080/auth/realms/master/protocol/openid-connect",
  "account-service": "http://localhost:8080/auth/realms/master/account",
  "tokens-not-before": 0
}

public_key is used for verification of JWT tokens.

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