RuntimeError: Missing "jwks_uri" in metadata

Describe the bug

Started happening once I tried upgrading from 0.15.5 to any of the pre-release versions.

I’m using Auth0 on a client flask application and I’ve registered it like so:

    from authlib.integrations import flask_client
    from authlib.integrations.base_client.errors import OAuthError
    import flask

    oauth = flask_client.OAuth(server)
    auth0 = oauth.register(
        "auth0",
        client_id=os.environ["AUTH0_CLIENT_ID"],
        client_secret=os.environ["AUTH0_CLIENT_SECRET"],
        api_base_url=os.environ["AUTH0_DOMAIN"],
        access_token_url=os.environ["AUTH0_DOMAIN"] + "/oauth/token",
        authorize_url=os.environ["AUTH0_DOMAIN"] + "/authorize",
        client_kwargs={
            "scope": "openid profile email",
        },
    )

    @server.route("/callback")
    def callback():
        # Handles response from token endpoint
        try:
            auth0.authorize_access_token()
   ...

That last line auth0.authorize_access_token() started throwing RuntimeError: Missing "jwks_uri" in metadata

it seems that the server_metadata is missing, from what I managed to find out.

Error Stacks

  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 2091, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 2076, in wsgi_app
    response = self.handle_exception(e)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/flask/app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/home/shadydealer/work/beme/reporting/apps/authentication/auth0.py", line 48, in callback
    auth0.authorize_access_token()
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/integrations/flask_client/apps.py", line 106, in authorize_access_token
    userinfo = self.parse_id_token(token, nonce=state_data['nonce'])
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/integrations/base_client/sync_openid.py", line 64, in parse_id_token
    claims = _jwt.decode(
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/jose/rfc7519/jwt.py", line 96, in decode
    data = self._jws.deserialize_compact(s, load_key, decode_payload)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/jose/rfc7515/jws.py", line 102, in deserialize_compact
    algorithm, key = self._prepare_algorithm_key(jws_header, payload, key)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/jose/rfc7515/jws.py", line 255, in _prepare_algorithm_key
    key = key(header, payload)
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/integrations/base_client/sync_openid.py", line 36, in load_key
    jwk_set = JsonWebKey.import_key_set(self.fetch_jwk_set())
  File "/home/shadydealer/.local/share/virtualenvs/reporting-87-gzJHg/lib/python3.8/site-packages/authlib/integrations/base_client/sync_openid.py", line 14, in fetch_jwk_set
    raise RuntimeError('Missing "jwks_uri" in metadata')

To Reproduce

Create an Auth0 tenant and create a flask client application then use the registration code specified above to register the flask app.

Expected behavior

To work as it used to in 0.15.5 or specify in the docs what changed

Environment:

• OS: Ubuntu 18.04
• Python Version: python 3.8
• Authlib Version: 1.0.0а1 and higher

[lepture]

https://accounts.google.com/.well-known/openid-configuration

 "jwks_uri": "https://www.googleapis.com/oauth2/v3/certs",

[shadydealer]

@lepture

Of course, here it is:

    from authlib.integrations import flask_client
    from authlib.integrations.base_client.errors import OAuthError
    import flask

    oauth = flask_client.OAuth(server)
    auth0 = oauth.register(
        "auth0",
        client_id=os.environ["AUTH0_CLIENT_ID"],
        client_secret=os.environ["AUTH0_CLIENT_SECRET"],
        api_base_url=os.environ["AUTH0_DOMAIN"],
        access_token_url=os.environ["AUTH0_DOMAIN"] + "/oauth/token",
        authorize_url=os.environ["AUTH0_DOMAIN"] + "/authorize",
        client_kwargs={
            "scope": "openid profile email",
        },
        server_metadata_url=os.environ["AUTH0_SERVER_METADATA_URL"],
    )

    @server.route("/callback")
    def callback():
        # Handles response from token endpoint
        try:
            auth0.authorize_access_token()
   ...

the AUTH0_SERVER_METADATA_URL value is https://YOUR_TENANT_NAME.YOUR_TENANT_REGION.auth0.com/.well-known/openid-configuration