Some controller helpers

MakeDownloadable.php

<?php

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\ResponseHeaderBag;

trait MakeDownloadable
{
    /**
     * @param Response $response
     * @param string $filename
     * @param string $contentType
     *
     * @return Response
     */
    private function makeDownloadable(Response $response, $filename, $contentType)
    {
        $disposition = $response->headers->makeDisposition(
            ResponseHeaderBag::DISPOSITION_ATTACHMENT,
            $filename
        );

        $response->headers->add([
            'Content-Type' => $contentType,
            'Content-Disposition' => $disposition,
        ]);

        return $response;
    }
}