public function RouteNormalizerRequestSubscriber::onKernelRequestRedirect in Redirect 8

Performs a redirect if the URL changes in routing.

The redirect happens if a URL constructed from the current route is different from the requested one. Examples:

• Language negotiation system detected a language to use, and that language has a path prefix: perform a redirect to the language prefixed URL.
• A route that's set as the front page is requested: redirect to the front page.
• Requested path has an alias: redirect to alias.

Parameters

\Symfony\Component\HttpKernel\Event\GetResponseEvent $event: The Event to process.

File

src/EventSubscriber/RouteNormalizerRequestSubscriber.php, line 86

Class

RouteNormalizerRequestSubscriber

Normalizes GET requests performing a redirect if required.

Namespace

Drupal\redirect\EventSubscriber

Code

public function onKernelRequestRedirect(GetResponseEvent $event) {
  if (!$this->config
    ->get('route_normalizer_enabled') || !$event
    ->isMasterRequest()) {
    return;
  }
  $request = $event
    ->getRequest();
  if ($request->attributes
    ->get('_disable_route_normalizer')) {
    return;
  }
  if ($this->redirectChecker
    ->canRedirect($request)) {

    // The "<current>" placeholder can be used for all routes except the front
    // page because it's not a real route.
    $route_name = $this->pathMatcher
      ->isFrontPage() ? '<front>' : '<current>';

    // Don't pass in the query here using $request->query->all()
    // since that can potentially modify the query parameters.
    $options = [
      'absolute' => TRUE,
    ];
    $redirect_uri = $this->urlGenerator
      ->generateFromRoute($route_name, [], $options);

    // Strip off query parameters added by the route such as a CSRF token.
    if (strpos($redirect_uri, '?') !== FALSE) {
      $redirect_uri = strtok($redirect_uri, '?');
    }

    // Append back the request query string from $_SERVER.
    $query_string = $request->server
      ->get('QUERY_STRING');
    if ($query_string) {
      $redirect_uri .= '?' . $query_string;
    }

    // Remove /index.php from redirect uri the hard way.
    if (!RequestHelper::isCleanUrl($request)) {

      // This needs to be fixed differently.
      $redirect_uri = str_replace('/index.php', '', $redirect_uri);
    }
    $original_uri = $request
      ->getSchemeAndHttpHost() . $request
      ->getRequestUri();
    $original_uri = urldecode($original_uri);
    $redirect_uri = urldecode($redirect_uri);
    if ($redirect_uri != $original_uri) {
      $response = new TrustedRedirectResponse($redirect_uri, $this->config
        ->get('default_status_code'));
      $response->headers
        ->set('X-Drupal-Route-Normalizer', 1);
      $event
        ->setResponse($response);
    }
  }
}