Add check_group_lookup_args and service_metadata to auth providers

data/users/externalldap.py

@@ -259,6 +259,26 @@ class LDAPUsers(FederatedUsers):
 
     return self._build_user_information(found_response)
 
+  def service_metadata(self):
+    return {
+      'base_dn': self._base_dn,
+    }
+
+  def check_group_lookup_args(self, group_lookup_args, disable_pagination=False):
+    if not group_lookup_args.get('group_dn'):
+      return (False, 'Missing group_dn')
+
+    (it, err) = self.iterate_group_members(group_lookup_args, page_size=1,
+                                           disable_pagination=disable_pagination)
+    if err is not None:
+      return (False, err)
+
+    results = list(it)
+    if not results:
+      return (False, 'Group does not exist or is empty')
+
+    return (True, None)
+
   def iterate_group_members(self, group_lookup_args, page_size=None, disable_pagination=False):
     try:
       with self._ldap.get_connection():