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- 06.01.2017
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FragmentListener.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpKernel\EventListener;
013
014 use Symfony\Component\HttpFoundation\Request;
015 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
016 use Symfony\Component\HttpKernel\KernelEvents;
017 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
018 use Symfony\Component\HttpKernel\UriSigner;
019 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
020
021 /**
022 * Handles content fragments represented by special URIs.
023 *
024 * All URL paths starting with /_fragment are handled as
025 * content fragments by this listener.
026 *
027 * If throws an AccessDeniedHttpException exception if the request
028 * is not signed or if it is not an internal sub-request.
029 *
030 * @author Fabien Potencier <fabien@symfony.com>
031 */
032 class FragmentListener implements EventSubscriberInterface
033 {
034 private $signer;
035 private $fragmentPath;
036
037 /**
038 * Constructor.
039 *
040 * @param UriSigner $signer A UriSigner instance
041 * @param string $fragmentPath The path that triggers this listener
042 */
043 public function __construct(UriSigner $signer, $fragmentPath = '/_fragment')
044 {
045 $this->signer = $signer;
046 $this->fragmentPath = $fragmentPath;
047 }
048
049 /**
050 * Fixes request attributes when the path is '/_fragment'.
051 *
052 * @param GetResponseEvent $event A GetResponseEvent instance
053 *
054 * @throws AccessDeniedHttpException if the request does not come from a trusted IP.
055 */
056 public function onKernelRequest(GetResponseEvent $event)
057 {
058 $request = $event->getRequest();
059
060 if ($this->fragmentPath !== rawurldecode($request->getPathInfo())) {
061 return;
062 }
063
064 if ($request->attributes->has('_controller')) {
065 // Is a sub-request: no need to parse _path but it should still be removed from query parameters as below.
066 $request->query->remove('_path');
067
068 return;
069 }
070
071 if ($event->isMasterRequest()) {
072 $this->validateRequest($request);
073 }
074
075 parse_str($request->query->get('_path', ''), $attributes);
076 $request->attributes->add($attributes);
077 $request->attributes->set('_route_params', array_replace($request->attributes->get('_route_params', array()), $attributes));
078 $request->query->remove('_path');
079 }
080
081 protected function validateRequest(Request $request)
082 {
083 // is the Request safe?
084 if (!$request->isMethodSafe()) {
085 throw new AccessDeniedHttpException();
086 }
087
088 // is the Request signed?
089 // we cannot use $request->getUri() here as we want to work with the original URI (no query string reordering)
090 if ($this->signer->check($request->getSchemeAndHttpHost().$request->getBaseUrl().$request->getPathInfo().(null !== ($qs = $request->server->get('QUERY_STRING')) ? '?'.$qs : ''))) {
091 return;
092 }
093
094 throw new AccessDeniedHttpException();
095 }
096
097 /**
098 * @deprecated since version 2.3.19, to be removed in 3.0.
099 *
100 * @return string[]
101 */
102 protected function getLocalIpAddresses()
103 {
104 @trigger_error('The '.__METHOD__.' method is deprecated since version 2.3.19 and will be removed in 3.0.', E_USER_DEPRECATED);
105
106 return array('127.0.0.1', 'fe80::1', '::1');
107 }
108
109 public static function getSubscribedEvents()
110 {
111 return array(
112 KernelEvents::REQUEST => array(array('onKernelRequest', 48)),
113 );
114 }
115 }
116