Pterodactyl-Panel/app/Http/Middleware/AdminAuthenticate.php

<?php
/**
 * Pterodactyl - Panel
 * Copyright (c) 2015 - 2017 Dane Everitt <dane@daneeveritt.com>.
 *
 * This software is licensed under the terms of the MIT license.
 * https://opensource.org/licenses/MIT
 */

namespace Pterodactyl\Http\Middleware;

use Closure;

class AdminAuthenticate
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if (! $request->user()) {
            if ($request->expectsJson() || $request->json()) {
                return response('Unauthorized.', 401);
            } else {
                return redirect()->guest('auth/login');
            }
        }

        if (! $request->user()->root_admin) {
            return abort(403);
        }

        return $next($request);
    }
}