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1<?php
2
3namespace App\EventSubscriber;
4
5use App\Normalizer\ExceptionNormalizer;
6use Symfony\Component\DependencyInjection\Attribute\AutowireIterator;
7use Symfony\Component\EventDispatcher\EventSubscriberInterface;
8use Symfony\Component\HttpFoundation\JsonResponse;
9use Symfony\Component\HttpKernel\Event\ExceptionEvent;
10use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
11use Symfony\Component\HttpKernel\KernelEvents;
12use Symfony\Component\Serializer\Exception\ExceptionInterface;
13
14/**
15 * Handles exceptions to generate Json responses using custom normalizers
16 * This allows more control on the error response format with no dependency to symfony internals.
17 *
18 * @author Wilhelm Zwertvaegher
19 */
20readonly class ExceptionSubscriber implements EventSubscriberInterface
21{
22    /**
23     * @param iterable<ExceptionNormalizer> $normalizers
24     */
25    public function __construct(
26        #[AutowireIterator('app.exception_normalizer')]
27        private iterable $normalizers,
28    ) {
29    }
30
31    /**
32     * @throws ExceptionInterface
33     */
34    public function onExceptionEvent(ExceptionEvent $event): void
35    {
36        $request = $event->getRequest();
37        if ('json' !== $request->getRequestFormat()) {
38            return;
39        }
40        $throwable = $event->getThrowable();
41        foreach ($this->normalizers as $normalizer) {
42            if ($normalizer->supportsNormalization($throwable)) {
43                $data = $normalizer->normalize($throwable);
44                $status = $data['status'] ?? ($throwable instanceof HttpExceptionInterface ? $throwable->getStatusCode() : 500);
45                $event->setResponse(new JsonResponse($data, $status));
46            }
47        }
48    }
49
50    public static function getSubscribedEvents(): array
51    {
52        return [
53            KernelEvents::EXCEPTION => 'onExceptionEvent',
54        ];
55    }
56}