firefly-iii/app/Http/Middleware/TrustProxies.php

<?php

/**
 * TrustProxies.php
 * Copyright (c) 2019 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace FireflyIII\Http\Middleware;

use Illuminate\Http\Middleware\TrustProxies as Middleware;
use Symfony\Component\HttpFoundation\Request;

/**
 * Class TrustProxies
 *

 */
class TrustProxies extends Middleware
{
    // After...
    protected $headers
        = Request::HEADER_X_FORWARDED_FOR |
          Request::HEADER_X_FORWARDED_HOST |
          Request::HEADER_X_FORWARDED_PORT |
          Request::HEADER_X_FORWARDED_PROTO |
          Request::HEADER_X_FORWARDED_AWS_ELB;

    /**
     * TrustProxies constructor.
     */
    public function __construct()
    {
        $this->proxies = (string)config('firefly.trusted_proxies');
    }
}