public function print_login() {
        $client = $this->get_user_oauth_client();
        $url = $client->get_login_url();

        if ($this->options['ajax']) {
            $popup = new stdClass();
            $popup->type = 'popup';
            $popup->url = $url->out(false);
            return array('login' => array($popup));
        } else {
            echo '<a target="_blank" href="'.$url->out(false).'">'.get_string('login', 'repository').'</a>';
        }
    }