core: fix UserSelfSerializer's save() overwriting other user attributes

closes #2070

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/core/api/users.py

@@ -156,6 +156,13 @@ class UserSelfSerializer(ModelSerializer):
             raise ValidationError("Not allowed to change username.")
         return username
 
+    def save(self, **kwargs):
+        if self.instance:
+            attributes: dict = self.instance.attributes
+            attributes.update(self.validated_data.get("attributes", {}))
+            self.validated_data["attributes"] = attributes
+        return super().save(**kwargs)
+
     class Meta:
 
         model = User

authentik/core/tests/test_users_api.py

@@ -24,11 +24,18 @@ class TestUsersAPI(APITestCase):
 
     def test_update_self(self):
         """Test update_self"""
+        self.admin.attributes["foo"] = "bar"
+        self.admin.save()
+        self.admin.refresh_from_db()
         self.client.force_login(self.admin)
         response = self.client.put(
             reverse("authentik_api:user-update-self"), data={"username": "foo", "name": "foo"}
         )
+        self.admin.refresh_from_db()
         self.assertEqual(response.status_code, 200)
+        self.assertEqual(self.admin.attributes["foo"], "bar")
+        self.assertEqual(self.admin.username, "foo")
+        self.assertEqual(self.admin.name, "foo")
 
     def test_update_self_name_denied(self):
         """Test update_self"""