abienvenu/Kyela

<?php
/*
 * Copyright 2014-2016 Arnaud Bienvenu
 *
 * This file is part of Kyela.

 * Kyela is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * Kyela is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.

 * You should have received a copy of the GNU Affero General Public License
 * along with Kyela.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace Abienvenu\KyelaBundle\EventListener;

use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
use Abienvenu\KyelaBundle\Controller\ParticipationController;

class CrawlerListener
{
    public function onKernelController(FilterControllerEvent $event)
    {
        $request = $event->getRequest();
        $controller = $event->getController();
        if ($controller[0] instanceof ParticipationController)
        {
            if (stripos($request->headers->get('User-Agent'), 'crawler') !== false ||
                stripos($request->headers->get('User-Agent'), 'MJ12bot') !== false)
            {
                throw new AccessDeniedHttpException("Crawler access is not allowed here");
            }
        }
    }
}