Add check_group_lookup_args and service_metadata to auth providers

data/users/__init__.py

@@ -186,6 +186,18 @@ class UserAuthentication(object):
     """ Verifies that the given username and password credentials are valid. """
     return self.state.verify_credentials(username_or_email, password)
 
+  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 self.state.check_group_lookup_args(group_lookup_args)
+
+  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 self.state.service_metadata()
+
   def iterate_group_members(self, group_lookup_args, page_size=None, disable_pagination=False):
     """ Returns a tuple of an iterator over all the members of the group matching the given lookup
         args dictionary, or the error that occurred if the initial call failed or is unsupported.