BTHLABS-50: Safari Web extension

Co-authored-by: Tomek Wójcik <labs@tomekwojcik.pl>
Co-committed-by: Tomek Wójcik <labs@tomekwojcik.pl>

services/backend/hotpocket_backend/apps/accounts/backends.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+from __future__ import annotations
+
+import logging
+import typing
+
+from django.contrib.auth.backends import ModelBackend, UserModel
+from django.http import HttpRequest
+
+from hotpocket_backend.apps.accounts.models import AccessToken, Account
+
+LOGGER = logging.getLogger(__name__)
+
+
+class AccessTokenBackend(ModelBackend):
+    def authenticate(self,
+                     request: HttpRequest,
+                     access_token: AccessToken | None,
+                     ) -> Account | None:
+        if not access_token:
+            return None
+
+        try:
+            user = UserModel.objects.get(pk=access_token.account_uuid)
+        except UserModel.DoesNotExist as exception:
+            LOGGER.error(
+                'Unhandled exception in AccessToken auth: %s',
+                exception,
+                exc_info=exception,
+            )
+
+        if self.user_can_authenticate(user) is False:
+            return None
+
+        request.access_token = access_token
+        return typing.cast(Account, user)