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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\HttpKernel\EventListener;
  13  
  14  use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  15  use Symfony\Component\HttpFoundation\Request;
  16  use Symfony\Component\HttpKernel\Event\GetResponseEvent;
  17  use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
  18  use Symfony\Component\HttpKernel\KernelEvents;
  19  use Symfony\Component\HttpKernel\UriSigner;
  20  
  21  /**
  22   * Handles content fragments represented by special URIs.
  23   *
  24   * All URL paths starting with /_fragment are handled as
  25   * content fragments by this listener.
  26   *
  27   * Throws an AccessDeniedHttpException exception if the request
  28   * is not signed or if it is not an internal sub-request.
  29   *
  30   * @author Fabien Potencier <fabien@symfony.com>
  31   */
  32  class FragmentListener implements EventSubscriberInterface
  33  {
  34      private $signer;
  35      private $fragmentPath;
  36  
  37      /**
  38       * @param UriSigner $signer       A UriSigner instance
  39       * @param string    $fragmentPath The path that triggers this listener
  40       */
  41      public function __construct(UriSigner $signer, $fragmentPath = '/_fragment')
  42      {
  43          $this->signer = $signer;
  44          $this->fragmentPath = $fragmentPath;
  45      }
  46  
  47      /**
  48       * Fixes request attributes when the path is '/_fragment'.
  49       *
  50       * @throws AccessDeniedHttpException if the request does not come from a trusted IP
  51       */
  52      public function onKernelRequest(GetResponseEvent $event)
  53      {
  54          $request = $event->getRequest();
  55  
  56          if ($this->fragmentPath !== rawurldecode($request->getPathInfo())) {
  57              return;
  58          }
  59  
  60          if ($request->attributes->has('_controller')) {
  61              // Is a sub-request: no need to parse _path but it should still be removed from query parameters as below.
  62              $request->query->remove('_path');
  63  
  64              return;
  65          }
  66  
  67          if ($event->isMasterRequest()) {
  68              $this->validateRequest($request);
  69          }
  70  
  71          parse_str($request->query->get('_path', ''), $attributes);
  72          $request->attributes->add($attributes);
  73          $request->attributes->set('_route_params', array_replace($request->attributes->get('_route_params', []), $attributes));
  74          $request->query->remove('_path');
  75      }
  76  
  77      protected function validateRequest(Request $request)
  78      {
  79          // is the Request safe?
  80          if (!$request->isMethodSafe(false)) {
  81              throw new AccessDeniedHttpException();
  82          }
  83  
  84          // is the Request signed?
  85          // we cannot use $request->getUri() here as we want to work with the original URI (no query string reordering)
  86          if ($this->signer->check($request->getSchemeAndHttpHost().$request->getBaseUrl().$request->getPathInfo().(null !== ($qs = $request->server->get('QUERY_STRING')) ? '?'.$qs : ''))) {
  87              return;
  88          }
  89  
  90          throw new AccessDeniedHttpException();
  91      }
  92  
  93      public static function getSubscribedEvents()
  94      {
  95          return [
  96              KernelEvents::REQUEST => [['onKernelRequest', 48]],
  97          ];
  98      }
  99  }