Usage

To set up SSO with Keycloak in your nameko service, follow these steps.

1. Get Keycloak configuration from realm -> Clients -> Installation, download as Keycloak OIDC JSON.

   Note

   Make sure auth-server-url ends with a trailing slash.

   Save this configuration in a .json file.

2. Add the mixin and dependency provider to your service and point to OIDC JSON config:

   from nameko_keycloak.dependencies import KeycloakProvider
   from nameko_keycloak.service import KeycloakSsoServiceMixin
   
   class MyService(KeycloakSsoServiceMixin):
       keycloak = KeycloakProvider("/tmp/keycloak.json")
   

3. Set up URLs for HTTP endpoints. The mixin exposes five methods prefixed with keycloak_, which you should use in your HTTP service. Delegate from your entrypoints like this:

   @http("GET", "/login")
   def login_sso(self, request):
       return self.keycloak_login_sso(request)
   

   This way it is up to you to control the URL routes and any middleware or extra request handling (such as CORS headers).

4. Implement a fetch_user() method on your service that takes user’s email address as a single argument and returns a user instance for that email (or None if no such user exists in whatever storage you’re using).

   Note

   We assume that email address is unique for every user.

   For example:

   def fetch_user(self, email: str) -> Optional[User]:
       user_manager = UserManager(self.db.session)
       return user_manager.get_by_email(email)
   

   This method is used to ensure that there is a local application user who matches the global identity stored in Keycloak.

5. (Optionally) Implement success and failure hook methods on your service.

   If you provide keycloak_success() method, the mixin will call it after successful login and redirect from Keycloak back to your application. The method will receive currently logged user as its argument. Similarly the mixin will call keycloak_failure() upon Keycloak errors.

   Example:

   def keycloak_success(self, user: User) -> None:
       logger.info(f"Successful login: {user=}")
   
   def keycloak_failure(self) -> None:
       logger.error("Failed to log in")
   

   Note

   Failure hooks execute in a try/except block, so you can access sys.exc_info, for example to capture exception to Sentry or other error reporting tool.