MediaSerializer.php

<?php

namespace App\Serializer;

use JMS\Serializer\Handler\SubscribingHandlerInterface;
use Sonata\MediaBundle\Provider\Pool;
use JMS\Serializer\VisitorInterface;
use Application\Sonata\MediaBundle\Entity\Media;
use JMS\Serializer\Context;
use JMS\Serializer\GraphNavigator;
use JMS\Serializer\XmlSerializationVisitor;
use Symfony\Component\HttpFoundation\RequestStack;


class MediaSerializer implements SubscribingHandlerInterface{
    
    /**
     * @param Sonata\MediaBundle\Provider\Pool $pool from sonata media
     * @param Symfony\Component\HttpFoundation\RequestStack $requesStack
     * @param AppBundle\Service\S3Service $s3Service
     */
    public function __construct(Pool $mediaService, RequestStack $requestStack) {
        $this->mediaService = $mediaService;
        $this->requestStack  = $requestStack;
    }

    public function serializeMedia(VisitorInterface $visitor, Media $media, array $type, Context $context) {
        $provider = $this->mediaService->getProvider($media->getProviderName();
        $format = $provider->getFormatName($media, 'reference');
        $url = $provider->generatePublicUrl($media, $format);
        $path =  $visitor->visitString($url, $type, $context);
        return $this->requestStack->getCurrentRequest()->getSchemeAndHttpHost().$path;
    }

    public static function getSubscribingMethods() {
        return [
            [
                'type' => Media::class,
                'format' => 'json',
                'direction' => GraphNavigator::DIRECTION_SERIALIZATION,
                'method' => 'serializeMedia',
            ],
            [
                'type' => Media::class,
                'format' => 'xml',
                'direction' => GraphNavigator::DIRECTION_SERIALIZATION,
                'method' => 'serializeMedia',
            ]
        ];
    }
}