Showcase the usage of claims config

Author: ArtyomVancyan

examples/demonstration/config.py

@@ -3,6 +3,7 @@
 from dotenv import load_dotenv
 from social_core.backends.github import GithubOAuth2
 
+from fastapi_oauth2.claims import Claims
 from fastapi_oauth2.client import OAuth2Client
 from fastapi_oauth2.config import OAuth2Config
 
@@ -20,6 +21,10 @@
             client_secret=os.getenv("OAUTH2_CLIENT_SECRET"),
             # redirect_uri="http://127.0.0.1:8000/",
             scope=["user:email"],
+            claims=Claims(
+                picture="avatar_url",
+                identity=lambda user: "%s:%s" % (user.get("provider"), user.get("id")),
+            ),
         ),
     ]
 )

examples/demonstration/main.py

@@ -22,7 +22,7 @@ async def on_auth(user: User):
     # the database and create if not exists
     db: Session = next(get_db())
     query = db.query(UserModel)
-    if not query.filter_by(identity=user.identity).first():
+    if user.identity and not query.filter_by(identity=user.identity).first():
         UserModel(**{
             "identity": user.get("identity"),
             "username": user.get("username"),