super-hog/resources/CustomHandlers/Action/FileDownload.php

<?php

namespace CustomHandlers\Actions;

use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;

use Mimey\MimeTypes;

/**
 *
 *
 *
 */

class FileDownload extends ActionHandler
{
    public function run()
    {
        if (isset($this->data->enclosure) && isset($this->data->enclosure->attributes()->url)) {

            // get mimes
            $mimes = new MimeTypes();
            $extension = $mimes->getExtension($this->data->enclosure->attributes()->type);

            // if extension valid
            if ($extension) {
                $filename = Str::slug($this->data->title).'.'.$extension;
                Storage::download($this->data->enclosure->attributes()->url)->put($filename);
            } else {
                // @TODO what you do 
            }
        }
    }
}