Create a facade for Symfony's IpUtils' checkIp method

Author: Anton Evers

lib/internal/Magento/Framework/App/MaintenanceMode.php

@@ -7,7 +7,7 @@
 
 use Magento\Framework\App\Filesystem\DirectoryList;
 use Magento\Framework\Filesystem;
-use Symfony\Component\HttpFoundation\IpUtils;
+use Magento\Framework\HTTP\IpChecker;
 
 /**
  * Application Maintenance Mode
@@ -62,7 +62,7 @@ public function isOn($remoteAddr = '')
         if (!$this->flagDir->isExist(self::FLAG_FILENAME)) {
             return false;
         }
-        return !IpUtils::checkIp($remoteAddr, $this->getAddressInfo());
+        return !IpChecker::isInRange($remoteAddr, $this->getAddressInfo());
     }
 
     /**

lib/internal/Magento/Framework/HTTP/IpChecker.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Framework\HTTP;
+
+use Symfony\Component\HttpFoundation\IpUtils;
+
+class IpChecker
+{
+    /**
+     * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
+     *
+     * @param string $requestIp IP to check
+     * @param string|array $ips List of IPs or subnets (can be a string if only a single one)
+     *
+     * @return bool Whether the IP is contained in the list of given IPs or subnets
+     */
+    public static function isInRange($requestIp, $ips)
+    {
+        return IpUtils::checkIp($requestIp, $ips);
+    }
+}