feat(oauth): refactor proxy context (#21483)

api/services/plugin/oauth_service.py

 class OAuthProxyService(BasePluginClient):
     # Default max age for proxy context parameter in seconds
     __MAX_AGE__ = 5 * 60  # 5 minutes
+    __KEY_PREFIX__ = "oauth_proxy_context:"
 
     @staticmethod
-    def create_proxy_context(user_id, tenant_id, plugin_id, provider):
+    def create_proxy_context(user_id: str, tenant_id: str, plugin_id: str, provider: str):
         """
         Create a proxy context for an OAuth 2.0 authorization request.
 
         is used to verify the state, ensuring the request's integrity and authenticity,
         and mitigating replay attacks.
         """
-        seconds, _ = redis_client.time()
         context_id = str(uuid.uuid4())
         data = {
             "user_id": user_id,
             "plugin_id": plugin_id,
             "tenant_id": tenant_id,
             "provider": provider,
-            # encode redis time to avoid distribution time skew
-            "timestamp": seconds,
         }
-        # ignore nonce collision
         redis_client.setex(
-            f"oauth_proxy_context:{context_id}",
+            f"{OAuthProxyService.__KEY_PREFIX__}{context_id}",
             OAuthProxyService.__MAX_AGE__,
             json.dumps(data),
         )
         return context_id
 
     @staticmethod
-    def use_proxy_context(context_id, max_age=__MAX_AGE__):
+    def use_proxy_context(context_id: str):
         """
         Validate the proxy context parameter.
         This checks if the context_id is valid and not expired.
         if not context_id:
             raise ValueError("context_id is required")
         # get data from redis
-        data = redis_client.getdel(f"oauth_proxy_context:{context_id}")
+        data = redis_client.getdel(f"{OAuthProxyService.__KEY_PREFIX__}{context_id}")
         if not data:
             raise ValueError("context_id is invalid")
-        # check if data is expired
-        seconds, _ = redis_client.time()
-        state = json.loads(data)
-        if state.get("timestamp") < seconds - max_age:
-            raise ValueError("context_id is expired")
-        return state
+        return json.loads(data)