transformation.php

<?php
namespace AppBundle\Service;
use Symfony\Component\HttpFoundation\RequestStack;
/**
 * Class ImagePathGenerator
 */
class ImagePathGenerator
{
    const LOGO_PREFIX = '/store/uploads/logo/';
    private $host;
    private $requestStack;
    /**
     * ImagePathGenerator constructor.
     * @param string       $host
     * @param RequestStack $requestStack
     */
    public function __construct($host, RequestStack $requestStack)
    {
        $this->host = $host;
        $this->requestStack = $requestStack;
    }
    /**
     * @param string $file
     * @return array
     */
    public function generateLogoSizes($file)
    {
        return $this->generateSizes(self::LOGO_PREFIX, $file);
    }
    /**
     * @param string $file
     * @return array
     */
    public function generateImagesSizes($file)
    {
        return $this->generateSizes('', $file);
    }
    protected function generateSizes($prefix, $file)
    {
        $request = $this->requestStack->getCurrentRequest();
        $template = $request->getScheme().'://'.$request->getHost().'/transform/resize_%sx-/%s';
        return [
            'small' => sprintf($template, 200, $this->host.$prefix.$file),
            'medium' => sprintf($template, 500, $this->host.$prefix.$file),
            'large' => $this->host.$prefix.$file,
        ];
    }
}