v2board/app/Http/Middleware/Server.php

<?php

namespace App\Http\Middleware;

use Closure;

class Server
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $token = $request->input('token');
        if (empty($token)) {
            abort(500, 'token is null');
        }
        if ($token !== config('v2board.server_token')) {
            abort(500, 'token is error');
        }
        return $next($request);
    }
}