feat: assign custom 404 pages with the website theme (1.8.0)

src/EventSubscriber/PublicNotFoundSubscriber.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\EventSubscriber;
+
+use App\Controller\PageController;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/** Also handle human-facing unknown URLs outside the content slug grammar. */
+final class PublicNotFoundSubscriber implements EventSubscriberInterface
+{
+    public function __construct(private PageController $pages, private string $adminPath)
+    {
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [KernelEvents::EXCEPTION => ['onException', 10]];
+    }
+
+    public function onException(ExceptionEvent $event): void
+    {
+        $request = $event->getRequest();
+        if (!$event->isMainRequest() || !$event->getThrowable() instanceof NotFoundHttpException
+            || $request->attributes->has('_route') || !in_array($request->getMethod(), ['GET', 'HEAD'], true)
+            || $request->isXmlHttpRequest() || 'html' !== $request->getPreferredFormat('html')) {
+            return;
+        }
+        $path = $request->getPathInfo();
+        if (preg_match('#^/(?:'.preg_quote($this->adminPath, '#').'|media|assets|formular|install)(?:/|$)#', $path)
+            || preg_match('/\.(?:css|js|mjs|json|xml|txt|png|jpe?g|webp|gif|svg|ico|woff2?|ttf|pdf)$/iD', $path)) {
+            return;
+        }
+        $event->setResponse($this->pages->notFound($request));
+    }
+}