"""passbook oauth_client Authorization backend"""
from django.contrib.auth.backends import ModelBackend
from django.db.models import Q
from passbook.sources.oauth.models import (OAuthSource,
UserOAuthSourceConnection)
class AuthorizedServiceBackend(ModelBackend):
"Authentication backend for users registered with remote OAuth provider."
def authenticate(self, request, source=None, identifier=None):
"Fetch user for a given source by id."
source_q = Q(source__name=source)
if isinstance(source, OAuthSource):
source_q = Q(source=source)
try:
access = UserOAuthSourceConnection.objects.filter(
source_q, identifier=identifier
).select_related('user')[0]
except IndexError:
return None
else:
return access.user
