src/AppBundle/Controller/Media/IndexController.php

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<?php

namespace AppBundle\Controller\Media;

use AppBundle\Controller\BaseController;
use Biz\File\Service\UploadFileService;
use Biz\File\UploadFileException;
use Symfony\Component\HttpFoundation\Request;

class IndexController extends BaseController
{
    public function playAction(Request $request, $mediaId)
    {
        $context = $request->query->get('context');

        if (!$this->getUploadFileService()->canManageFile($mediaId)) {
            $this->createNewException(UploadFileException::FORBIDDEN_MANAGE_FILE());
        }

        return $this->forward('AppBundle:Player:show', array('id' => $mediaId, 'context' => $context));
    }

    /**
     * @return UploadFileService
     */
    protected function getUploadFileService()
    {
        return $this->getBiz()->service('File:UploadFileService');
    }
}