"""passbook oauth_client Authorization backend"""
from typing import Optional
from django.contrib.auth.backends import ModelBackend
from django.http import HttpRequest
from passbook.core.models import User
from passbook.sources.oauth.models import OAuthSource, UserOAuthSourceConnection
class AuthorizedServiceBackend(ModelBackend):
"Authentication backend for users registered with remote OAuth provider."
def authenticate(
self, request: HttpRequest, source: OAuthSource, identifier: str
) -> Optional[User]:
"Fetch user for a given source by id."
access = UserOAuthSourceConnection.objects.filter(
source=source, identifier=identifier
).select_related("user")
if not access.exists():
return None
return access.first().user
