Add check_group_lookup_args and service_metadata to auth providers

data/users/federated.py

@@ -72,6 +72,18 @@ class FederatedUsers(object):
 
     return (db_user, None)
 
+  def service_metadata(self):
+    """ Returns a dictionary of extra metadata to present to *superusers* about this auth engine.
+        For example, LDAP returns the base DN so we can display to the user during sync setup.
+    """
+    return {}
+
+  def check_group_lookup_args(self, group_lookup_args):
+    """ Verifies that the given group lookup args point to a valid group. Returns a tuple consisting
+        of a boolean status and an error message (if any).
+    """
+    return (False, 'Not supported')
+
   def iterate_group_members(self, group_lookup_args, page_size=None, disable_pagination=False):
     """ Returns an iterator over all the members of the group matching the given lookup args
         dictionary. The format of the lookup args dictionary is specific to the implementation.