koel/app/Http/Controllers/Download/DownloadAlbumController.php

<?php

namespace App\Http\Controllers\Download;

use App\Http\Controllers\Controller;
use App\Models\Album;
use App\Models\User;
use App\Repositories\SongRepository;
use App\Services\DownloadService;
use Illuminate\Contracts\Auth\Authenticatable;

class DownloadAlbumController extends Controller
{
    /** @param User $user */
    public function __invoke(Album $album, SongRepository $repository, DownloadService $download, Authenticatable $user)
    {
        return response()->download($download->from($repository->getByAlbum($album, $user)));
    }
}