Add event dispatching to manifest compilation (#179)

* Add event dispatching to manifest compilation

This update introduces event dispatching in the manifest compilation process. PreManifestCompileEvent and PostManifestCompileEvent have been added, which are dispatched before and after the compilation respectively. The modification enhances the flexibility and extensibility of the manifest compilation process by allowing custom actions just before or after compilation.

src/Event/NullEventDispatcher.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SpomkyLabs\PwaBundle\Event;
+
+use Psr\EventDispatcher\EventDispatcherInterface;
+
+final readonly class NullEventDispatcher implements EventDispatcherInterface
+{
+    public function dispatch(object $event): object
+    {
+        return $event;
+    }
+}

src/Event/PostManifestCompileEvent.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SpomkyLabs\PwaBundle\Event;
+
+use SpomkyLabs\PwaBundle\Dto\Manifest;
+
+final class PostManifestCompileEvent
+{
+    public function __construct(
+        public Manifest $manifest,
+        public string $data
+    ) {
+    }
+}

src/Event/PreManifestCompileEvent.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SpomkyLabs\PwaBundle\Event;
+
+use SpomkyLabs\PwaBundle\Dto\Manifest;
+
+class PreManifestCompileEvent
+{
+    public function __construct(
+        public Manifest $manifest,
+    ) {
+    }
+}

src/Subscriber/ManifestCompileEventListener.php

@@ -4,7 +4,11 @@
 
 namespace SpomkyLabs\PwaBundle\Subscriber;
 
+use Psr\EventDispatcher\EventDispatcherInterface;
 use SpomkyLabs\PwaBundle\Dto\Manifest;
+use SpomkyLabs\PwaBundle\Event\NullEventDispatcher;
+use SpomkyLabs\PwaBundle\Event\PostManifestCompileEvent;
+use SpomkyLabs\PwaBundle\Event\PreManifestCompileEvent;
 use Symfony\Component\AssetMapper\Event\PreAssetsCompileEvent;
 use Symfony\Component\AssetMapper\Path\PublicAssetsFilesystemInterface;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
@@ -21,6 +25,8 @@
 #[AsEventListener(PreAssetsCompileEvent::class)]
 final readonly class ManifestCompileEventListener
 {
+    private EventDispatcherInterface $dispatcher;
+
     private string $manifestPublicUrl;
 
     private array $jsonOptions;
@@ -36,7 +42,9 @@ public function __construct(
         private PublicAssetsFilesystemInterface $assetsFilesystem,
         #[Autowire('%kernel.debug%')]
         bool $debug,
+        null|EventDispatcherInterface $dispatcher = null,
     ) {
+        $this->dispatcher = $dispatcher ?? new NullEventDispatcher();
         $this->manifestPublicUrl = '/' . trim($manifestPublicUrl, '/');
         $options = [
             AbstractObjectNormalizer::SKIP_UNINITIALIZED_VALUES => true,
@@ -55,7 +63,11 @@ public function __invoke(PreAssetsCompileEvent $event): void
         if (! $this->manifestEnabled) {
             return;
         }
-        $data = $this->serializer->serialize($this->manifest, 'json', $this->jsonOptions);
-        $this->assetsFilesystem->write($this->manifestPublicUrl, $data);
+        $manifest = clone $this->manifest;
+        $this->dispatcher->dispatch(new PreManifestCompileEvent($manifest));
+        $data = $this->serializer->serialize($manifest, 'json', $this->jsonOptions);
+        $postEvent = new PostManifestCompileEvent($manifest, $data);
+        $this->dispatcher->dispatch($postEvent);
+        $this->assetsFilesystem->write($this->manifestPublicUrl, $postEvent->data);
     }
 }

src/Subscriber/PwaDevServerSubscriber.php

@@ -4,8 +4,12 @@
 
 namespace SpomkyLabs\PwaBundle\Subscriber;
 
+use Psr\EventDispatcher\EventDispatcherInterface;
 use SpomkyLabs\PwaBundle\Dto\Manifest;
 use SpomkyLabs\PwaBundle\Dto\ServiceWorker;
+use SpomkyLabs\PwaBundle\Event\NullEventDispatcher;
+use SpomkyLabs\PwaBundle\Event\PostManifestCompileEvent;
+use SpomkyLabs\PwaBundle\Event\PreManifestCompileEvent;
 use SpomkyLabs\PwaBundle\Service\ServiceWorkerCompiler;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
@@ -31,6 +35,8 @@
 
 final readonly class PwaDevServerSubscriber implements EventSubscriberInterface
 {
+    private EventDispatcherInterface $dispatcher;
+
     private string $manifestPublicUrl;
 
     private null|string $serviceWorkerPublicUrl;
@@ -55,7 +61,9 @@ public function __construct(
         private null|Profiler $profiler,
         #[Autowire('%kernel.debug%')]
         bool $debug,
+        null|EventDispatcherInterface $dispatcher = null,
     ) {
+        $this->dispatcher = $dispatcher ?? new NullEventDispatcher();
         $this->manifestPublicUrl = '/' . trim($manifestPublicUrl, '/');
         $serviceWorkerPublicUrl = $serviceWorker->dest;
         $this->serviceWorkerPublicUrl = '/' . trim($serviceWorkerPublicUrl, '/');
@@ -128,12 +136,17 @@ public static function getSubscribedEvents(): array
     private function serveManifest(RequestEvent $event): void
     {
         $this->profiler?->disable();
-        $body = $this->serializer->serialize($this->manifest, 'json', $this->jsonOptions);
-        $response = new Response($body, Response::HTTP_OK, [
+        $manifest = clone $this->manifest;
+        $this->dispatcher->dispatch(new PreManifestCompileEvent($manifest));
+        $data = $this->serializer->serialize($manifest, 'json', $this->jsonOptions);
+        $postEvent = new PostManifestCompileEvent($manifest, $data);
+        $this->dispatcher->dispatch($postEvent);
+
+        $response = new Response($data, Response::HTTP_OK, [
             'Cache-Control' => 'public, max-age=604800, immutable',
             'Content-Type' => 'application/manifest+json',
             'X-Manifest-Dev' => true,
-            'Etag' => hash('xxh128', $body),
+            'Etag' => hash('xxh128', $data),
         ]);
 
         $event->setResponse($response);