Invalidate tokens within the expiry margin (#88)

Author: lakelse

emailproxy.py

@@ -411,8 +411,8 @@ def get_account_with_catch_all_fallback(option):
                                        OAuth2Helper.encrypt(fernet, response['refresh_token']))
                         AppConfig.save()
 
-                    elif access_token_expiry <= current_time:
-                        access_token = None  # avoid trying invalid tokens
+                    else:
+                        access_token = None  # avoid trying invalid (or soon to be) tokens
                 else:
                     access_token = OAuth2Helper.decrypt(fernet, access_token)