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EDIT :: Firewall.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Security\Http;

use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Firewall uses a FirewallMap to register security listeners for the given
 * request.
 *
 * It allows for different security strategies within the same application
 * (a Basic authentication for the /api, and a web based authentication for
 * everything else for instance).
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Firewall implements EventSubscriberInterface
{
    private $map;
    private $dispatcher;
    private $exceptionListeners;

/**
     * Constructor.
     *
     * @param FirewallMapInterface     $map        A FirewallMapInterface instance
     * @param EventDispatcherInterface $dispatcher An EventDispatcherInterface instance
     */
    public function __construct(FirewallMapInterface $map, EventDispatcherInterface $dispatcher)
    {
        $this->map = $map;
        $this->dispatcher = $dispatcher;
        $this->exceptionListeners = new \SplObjectStorage();
    }

/**
     * Handles security.
     *
     * @param GetResponseEvent $event An GetResponseEvent instance
     */
    public function onKernelRequest(GetResponseEvent $event)
    {
        if (!$event->isMasterRequest()) {
            return;
        }

// register listeners for this firewall
        list($listeners, $exceptionListener) = $this->map->getListeners($event->getRequest());
        if (null !== $exceptionListener) {
            $this->exceptionListeners[$event->getRequest()] = $exceptionListener;
            $exceptionListener->register($this->dispatcher);
        }

// initiate the listener chain
        foreach ($listeners as $listener) {
            $listener->handle($event);

if ($event->hasResponse()) {
                break;
            }
        }
    }

public function onKernelFinishRequest(FinishRequestEvent $event)
    {
        $request = $event->getRequest();

if (isset($this->exceptionListeners[$request])) {
            $this->exceptionListeners[$request]->unregister($this->dispatcher);
            unset($this->exceptionListeners[$request]);
        }
    }

/**
     * {@inheritDoc}
     */
    public static function getSubscribedEvents()
    {
        return array(
            KernelEvents::REQUEST => array('onKernelRequest', 8),
            KernelEvents::FINISH_REQUEST => 'onKernelFinishRequest',
        );
    }
}

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EDIT :: Firewall.php