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- <?php
- namespace Drupal\Core\EventSubscriber;
- use Drupal\Core\Access\AccessManagerInterface;
- use Drupal\Core\Cache\RefinableCacheableDependencyInterface;
- use Drupal\Core\Config\ConfigFactoryInterface;
- use Drupal\Core\Routing\AccessAwareRouterInterface;
- use Drupal\Core\Routing\RedirectDestinationInterface;
- use Drupal\Core\Url;
- use Psr\Log\LoggerInterface;
- use Symfony\Component\HttpFoundation\Response;
- use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
- use Symfony\Component\HttpKernel\HttpKernelInterface;
- use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
- /**
- * Exception subscriber for handling core custom HTML error pages.
- */
- class CustomPageExceptionHtmlSubscriber extends DefaultExceptionHtmlSubscriber {
- /**
- * The configuration factory.
- *
- * @var \Drupal\Core\Config\ConfigFactoryInterface
- */
- protected $configFactory;
- /**
- * The access manager.
- *
- * @var \Drupal\Core\Access\AccessManagerInterface
- */
- protected $accessManager;
- /**
- * Constructs a new CustomPageExceptionHtmlSubscriber.
- *
- * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
- * The configuration factory.
- * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
- * The HTTP Kernel service.
- * @param \Psr\Log\LoggerInterface $logger
- * The logger service.
- * @param \Drupal\Core\Routing\RedirectDestinationInterface $redirect_destination
- * The redirect destination service.
- * @param \Symfony\Component\Routing\Matcher\UrlMatcherInterface $access_unaware_router
- * A router implementation which does not check access.
- * @param \Drupal\Core\Access\AccessManagerInterface $access_manager
- * The access manager.
- */
- public function __construct(ConfigFactoryInterface $config_factory, HttpKernelInterface $http_kernel, LoggerInterface $logger, RedirectDestinationInterface $redirect_destination, UrlMatcherInterface $access_unaware_router, AccessManagerInterface $access_manager) {
- parent::__construct($http_kernel, $logger, $redirect_destination, $access_unaware_router);
- $this->configFactory = $config_factory;
- $this->accessManager = $access_manager;
- }
- /**
- * {@inheritdoc}
- */
- protected static function getPriority() {
- return -50;
- }
- /**
- * {@inheritdoc}
- */
- public function on403(GetResponseForExceptionEvent $event) {
- $custom_403_path = $this->configFactory->get('system.site')->get('page.403');
- if (!empty($custom_403_path)) {
- $this->makeSubrequestToCustomPath($event, $custom_403_path, Response::HTTP_FORBIDDEN);
- }
- }
- /**
- * {@inheritdoc}
- */
- public function on404(GetResponseForExceptionEvent $event) {
- $custom_404_path = $this->configFactory->get('system.site')->get('page.404');
- if (!empty($custom_404_path)) {
- $this->makeSubrequestToCustomPath($event, $custom_404_path, Response::HTTP_NOT_FOUND);
- }
- }
- /**
- * Makes a subrequest to retrieve the custom error page.
- *
- * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
- * The event to process.
- * @param string $custom_path
- * The custom path to which to make a subrequest for this error message.
- * @param int $status_code
- * The status code for the error being handled.
- */
- protected function makeSubrequestToCustomPath(GetResponseForExceptionEvent $event, $custom_path, $status_code) {
- $url = Url::fromUserInput($custom_path);
- if ($url->isRouted()) {
- $access_result = $this->accessManager->checkNamedRoute($url->getRouteName(), $url->getRouteParameters(), NULL, TRUE);
- $request = $event->getRequest();
- // Merge the custom path's route's access result's cacheability metadata
- // with the existing one (from the master request), otherwise create it.
- if (!$request->attributes->has(AccessAwareRouterInterface::ACCESS_RESULT)) {
- $request->attributes->set(AccessAwareRouterInterface::ACCESS_RESULT, $access_result);
- }
- else {
- $existing_access_result = $request->attributes->get(AccessAwareRouterInterface::ACCESS_RESULT);
- if ($existing_access_result instanceof RefinableCacheableDependencyInterface) {
- $existing_access_result->addCacheableDependency($access_result);
- }
- }
- // Only perform the subrequest if the custom path is actually accessible.
- if (!$access_result->isAllowed()) {
- return;
- }
- }
- $this->makeSubrequest($event, $custom_path, $status_code);
- }
- }
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