diff core/lib/Drupal/Core/EventSubscriber/Fast404ExceptionHtmlSubscriber.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/EventSubscriber/Fast404ExceptionHtmlSubscriber.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,84 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Component\Utility\Html;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+/**
+ * High-performance 404 exception subscriber.
+ *
+ * This subscriber will return a minimalist 404 response for HTML requests
+ * without running a full page theming operation.
+ */
+class Fast404ExceptionHtmlSubscriber extends HttpExceptionSubscriberBase {
+
+  /**
+   * The HTTP kernel.
+   *
+   * @var \Symfony\Component\HttpKernel\HttpKernelInterface
+   */
+  protected $httpKernel;
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a new Fast404ExceptionHtmlSubscriber.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The configuration factory.
+   * @param \Symfony\Component\HttpKernel\HttpKernelInterface $http_kernel
+   *   The HTTP Kernel service.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, HttpKernelInterface $http_kernel) {
+    $this->configFactory = $config_factory;
+    $this->httpKernel = $http_kernel;
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static function getPriority() {
+    // A very high priority so that it can take precedent over anything else,
+    // and thus be fast.
+    return 200;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getHandledFormats() {
+    return ['html'];
+  }
+
+  /**
+   * Handles a 404 error for HTML.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+   *   The event to process.
+   */
+  public function on404(GetResponseForExceptionEvent $event) {
+    $request = $event->getRequest();
+
+    $config = $this->configFactory->get('system.performance');
+    $exclude_paths = $config->get('fast_404.exclude_paths');
+    if ($config->get('fast_404.enabled') && $exclude_paths && !preg_match($exclude_paths, $request->getPathInfo())) {
+      $fast_paths = $config->get('fast_404.paths');
+      if ($fast_paths && preg_match($fast_paths, $request->getPathInfo())) {
+        $fast_404_html = strtr($config->get('fast_404.html'), ['@path' => Html::escape($request->getUri())]);
+        $response = new Response($fast_404_html, Response::HTTP_NOT_FOUND);
+        $event->setResponse($response);
+      }
+    }
+  }
+
+}