pixelfed/app/Http/Controllers/MediaController.php

<?php

namespace App\Http\Controllers;

use App\Media;
use Illuminate\Http\Request;

class MediaController extends Controller
{
    public function index(Request $request)
    {
        //return view('settings.drive.index');
        abort(404);
    }

    public function composeUpdate(Request $request, $id)
    {
        abort(400, 'Endpoint deprecated');
    }

    public function fallbackRedirect(Request $request, $pid, $mhash, $uhash, $f)
    {
        abort_if(! (bool) config_cache('pixelfed.cloud_storage'), 404);
        $path = 'public/m/_v2/'.$pid.'/'.$mhash.'/'.$uhash.'/'.$f;
        $media = Media::whereProfileId($pid)
            ->whereMediaPath($path)
            ->whereNotNull('cdn_url')
            ->firstOrFail();

        return redirect()->away($media->cdn_url);
    }
}