pai-sklep/app/Http/Middleware/AdminAuth.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;

class AdminAuth
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $user = Auth::user();
        if ($user && $user->isAdmin()) {
            return $next($request);
        }
        throw new AccessDeniedHttpException("You must be an admin to access this path");
    }
}