ProcessIp.php

<?php

/*
 * This file is part of Flarum.
 *
 * For detailed copyright and license information, please view the
 * LICENSE file that was distributed with this source code.
 */

namespace Flarum\Http\Middleware;

use Illuminate\Support\Arr;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface as Middleware;
use Psr\Http\Server\RequestHandlerInterface;

class ProcessIp implements Middleware
{
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $ipAddress = Arr::get($request->getServerParams(), 'REMOTE_ADDR', '127.0.0.1');

        return $handler->handle($request->withAttribute('ipAddress', $ipAddress));
    }
}