9.5/_ip_anonymization_utility_8php_source.html

<?php

declare(strict_types = 1);

namespace ‪TYPO3\CMS\Core\Utility;


/*

 * This file is part of the TYPO3 CMS project.

 *

 * It is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, either version 2

 * of the License, or any later version.

 *

 * For the full copyright and license information, please read the

 * LICENSE.txt file that was distributed with this source code.

 *

 * The TYPO3 project - inspiring people to share!

 */


class ‪IpAnonymizationUtility

{


    const ‪MASKV4 = [

        1 => '255.255.255.0',

        2 => '255.255.0.0'

    ];


    const ‪MASKV6 = [

        1 => 'ffff:ffff:ffff:ffff:0000:0000:0000:0000',

        2 => 'ffff:ffff:ffff:0000:0000:0000:0000:0000',

    ];


    public static function ‪anonymizeIp(string $address, int $mask = null): string

    {

        if ($mask === null) {

            $mask = (int)‪$GLOBALS['TYPO3_CONF_VARS']['SYS']['ipAnonymization'];

        }

        if ($mask < 0 || $mask > 2) {

            throw new \UnexpectedValueException(sprintf('The provided value "%d" is not an allowed value for the IP mask.', $mask), 1519739203);

        }

        if ($mask === 0) {

            return $address;

        }

        if (empty($address)) {

            return '';

        }


        $packedAddress = @inet_pton($address);

        if ($packedAddress === false) {

            return '';

        }

        $length = strlen($packedAddress);


        if ($length === 4) {

            $bitMask = self::MASKV4[$mask];

        } elseif ($length === 16) {

            $bitMask = self::MASKV6[$mask];

        } else {

            return '';

        }

        return inet_ntop($packedAddress & inet_pton($bitMask));

    }

}