index.php

<?php
/**
 * OpenMage
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magento.com so we can send you a copy immediately.
 *
 * @category    Mage
 * @package     Mage
 * @copyright  Copyright (c) 2006-2020 Magento, Inc. (https://www.magento.com)
 * @copyright  Copyright (c) 2018-2022 The OpenMage Contributors (https://www.openmage.org)
 * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

define('MAGENTO_ROOT', getcwd());

$mageFilename = MAGENTO_ROOT . '/app/Mage.php';
$maintenanceFile = 'maintenance.flag';
$maintenanceIpFile = 'maintenance.ip';

require MAGENTO_ROOT . '/app/bootstrap.php';
require_once $mageFilename;

#Varien_Profiler::enable();

umask(0);

/* Store or website code */
$mageRunCode = $_SERVER['MAGE_RUN_CODE'] ?? '';

/* Run store or run website */
$mageRunType = $_SERVER['MAGE_RUN_TYPE'] ?? 'store';

if (file_exists($maintenanceFile)) {
    $maintenanceBypass = false;

    if (file_exists($maintenanceIpFile)) {
        /* if maintenanceFile and maintenanceIpFile are set use Mage to get remote IP (in order to respect remote_addr_headers xml config) */
        Mage::init($mageRunCode, $mageRunType);
        $currentIp = Mage::helper('core/http')->getRemoteAddr();
        $allowedIps = explode(',', trim(file_get_contents($maintenanceIpFile)));

        if (in_array($currentIp, $allowedIps)) {
            /* IP address matches, bypass maintenanceMode */
            $maintenanceBypass = true;
        }
    }
    if (!$maintenanceBypass) {
        include_once __DIR__ . '/errors/503.php';
        exit;
    }
}

Mage::run($mageRunCode, $mageRunType);