Middleware Sample

SampleController.php

<?php

declare(strict_types = 1);

class SampleController
{
    public function sampleAction()
    {
        $payload = $request->getAttribute('dataObject');

        // Do something
      
        return new JsonResponse(
            ['actionId' => 1],
            204
        );
    }
}

SampleRequestListener.php

<?php

declare(strict_types = 1);

namespace Listener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\PropertyInfo\Extractor\PhpDocExtractor;
use Symfony\Component\Routing\Router;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Validator\Validator\ValidatorInterface;
use Exception\Domain\Model\Exception\MalformedRequestException;
use Exception\Domain\Model\Exception\SymfonyValidationException;

class SampleRequestListener
{
    public function __construct(
        Router $router,
        ValidatorInterface $validator
    ) {
        $this->router = $router;
        $this->validator = $validator;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();

        $routeCollection = $this->router->getRouteCollection();
        $route = $routeCollection->get($request->get('_route'));

        $data_object = $route->getOption('data_object');

        if (!$data_object) {
          return;
        }
        
        $payload = json_decode($request->getContent(), true);

        if (json_last_error() !== JSON_ERROR_NONE) {
            throw MalformedRequestException::fromJsonErrorCode(json_last_error());
        }

        if (empty($payload)) {
            throw MalformedRequestException::forEmptyBody();
        }

        $serializer = new Serializer([new ObjectNormalizer(null, null, null, new PhpDocExtractor())]);
        $dto = $serializer->denormalize($payload, $data_object);

        $violations = $this->validator->validate($dto);

        if (count($violations) > 0) {
            throw SymfonyValidationException::fromConstraintViolations($violations);
        }

        $request->attributes->add(['dataObject' => $dto]);
        
    }
}

services.xml

<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
  <service
      id="sample.listener"
      class="Listener\SampleRequestListener">

      <argument type="service" id="router" />
      <argument type="service" id="validator" />

      <tag name="kernel.event_listener" event="kernel.controller_arguments" />
      <tag name="kernel.event_listener" event="kernel.request" method="onKernelRequest" />
  </service>
</services>