gallery-api/src/App/Action/ListGalleriesAction.php

<?php

namespace App\Action;

use App\Response\JsonCorsResponse;
use App\Service\GalleryService;
use Interop\Http\ServerMiddleware\DelegateInterface;
use Interop\Http\ServerMiddleware\MiddlewareInterface as ServerMiddlewareInterface;
use Psr\Http\Message\ServerRequestInterface;

class ListGalleriesAction implements ServerMiddlewareInterface
{
    private $galleryService;

    public function __construct(GalleryService $galleryService)
    {
        $this->galleryService = $galleryService;
    }

    public function process(ServerRequestInterface $request, DelegateInterface $delegate)
    {
      return new JsonCorsResponse($this->galleryService->loadGalleryData(true));
    }
}