AddWatermarkMiddleware.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Spatie\Image\Image;
use Spatie\Image\Manipulations;
use Symfony\Component\HttpFoundation\File\UploadedFile;

class AddWatermarkMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure(\Illuminate\Http\Request): (\Illuminate\Http\Response|\Illuminate\Http\RedirectResponse)  $next
     * @return \Illuminate\Http\Response|\Illuminate\Http\RedirectResponse
     */
    public function handle(Request $request, Closure $next)
    {
        collect($request->allFiles())
            ->flatten()
            ->filter(function (UploadedFile $file) {
                if (app()->environment('testing')) {
                    return true;
                }

                return $file->isValid();
            })
            ->each(function (UploadedFile $file) {
                Image::load($file->getPathname())
                    ->watermark('_site/assets/img/logo.png')
                    ->watermarkOpacity(50)
                    ->watermarkPosition(Manipulations::POSITION_CENTER)
                    ->save();
            });

        return $next($request);
    }
}