Is administrator middleware for Laravel

Administrator.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class Administrator
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        if (! $request->user()->isAdministrator()) {
            if ($request->ajax()) {
                return response('Forbidden.', 403);
            } else {
                throw new AccessDeniedHttpException;
            }
        }

        return $next($request);
    }
}