Laravel Stream Download

stream_download.php

<?php

use Illuminate\Http\Response;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\HttpFoundation\StreamedResponse;

/**
 * Similar to Storage::download, but serves the file as a stream.
 * 
 * Stolen and adapted from stackoverflow.com/questions/44965777/laravel-5-file-downloads-stream-or-download
 */
function stream_download(string $asset): StreamedResponse
{
    abort_unless(Storage::exists($asset), Response::HTTP_NOT_FOUND);

    return response()->stream(function () use ($asset) {
        $stream = Storage::readStream($asset);

        fpassthru($stream);

        if (is_resource($stream))
            fclose($stream);

    }, headers: [
        'Content-Type' => Storage::mimeType($asset),
        'Content-Length' => Storage::size($asset),
    ]);
}