Upload

// Listener

class ImageUploadListener
{
    private $uploader;

    public function __construct(FileUploader $uploader)
    {
        $this->uploader = $uploader;
    }

    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();

        $this->uploadFile($entity);
    }

    public function preUpdate(PreUpdateEventArgs $args)
    {
        $entity = $args->getEntity();

        $this->uploadFile($entity);
    }

    private function uploadFile($entity)
    {
        // upload only works for Image class inherited entities
        if (!$entity instanceof Image) {
            return;
        }

        ;
        $file = $entity->getUrl();
        $nameAlt = $entity->getAlt();



        // only upload new files
        if ($file instanceof UploadedFile) {
            $fileName = $this->uploader->upload($file);
            $entity->setUrl($fileName);
            $entity->setAlt($nameAlt);
        }
    }
}


// Uploader

class FileUploader
{
    const ASSET_PATH = 'images/';

    private $targetDir;


    public function __construct($targetDir)
    {
        $this->targetDir = $targetDir . '/uploads/' . self::ASSET_PATH;
    }

    public function upload(UploadedFile $file)
    {
        $fileName = md5(uniqid()).'.'.$file->guessExtension();

        $file->move($this->getTargetDir(), $fileName);

        return $fileName;
    }

    public function getTargetDir()
    {
        return $this->targetDir;
    }
}