invoiceninja/app/Http/Middleware/TrustProxies.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Middleware;

use Fideloper\Proxy\TrustProxies as Middleware;
use Illuminate\Contracts\Config\Repository;
use Illuminate\Http\Request;

class TrustProxies extends Middleware
{
    /**
     * The trusted proxies for this application.
     *
     * @var array
     */
    protected $proxies;

    /**
     * The headers that should be used to detect proxies.
     *
     * @var int
     */
    protected $headers = Request::HEADER_X_FORWARDED_ALL;

    /*
     * Instantiate trusted proxies middleware
     *
     * @param \Illuminate\Contracts\Config\Repository $config
     */
    public function __construct(Repository $config)
    {
        parent::__construct($config);
    
        if (config('ninja.trusted_proxies')) {
            $this->proxies = config('ninja.trusted_proxies');
        }
    }
}