private function check_password()
    {
        if (
            isset($_POST['username']) &&
            isset($_POST['password']) &&
            (($user = $this->manager_user->load_user_by_username(PPOST_STR('username'))) !== false) &&
            $this->manager_user->verify_user_password($user['id'], SOCIAL_ID, PPOST_STR('password'))
        )
        {
            $worker_key_data = new worker_key_data();
            $hash = md5($user['id'].$user['username'].time());
            $worker_key_data->save_data($hash, array($user['id'], PSERVER_STR('REMOVE_ADDR'), time()));
            return $hash;
        }
    }