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add anonymize

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Thomas Portelange 2023-06-28 10:25:19 +02:00 committed by GitHub
parent 60ca35c02d
commit a969180433
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1 changed files with 32 additions and 0 deletions
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32
src/Control/Util/IPUtils.php
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@ -131,4 +131,36 @@ class IPUtils
return true;
}
/**
* Anonymizes an IP/IPv6.
*
* Removes the last byte for v4 and the last 8 bytes for v6 IPs
*/
public static function anonymize(string $ip): string
{
$wrappedIPv6 = false;
if (str_starts_with($ip, '[') && str_ends_with($ip, ']')) {
$wrappedIPv6 = true;
$ip = substr($ip, 1, -1);
}
$packedAddress = inet_pton($ip);
if (4 === \strlen($packedAddress)) {
$mask = '255.255.255.0';
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff:ffff'))) {
$mask = '::ffff:ffff:ff00';
} elseif ($ip === inet_ntop($packedAddress & inet_pton('::ffff:ffff'))) {
$mask = '::ffff:ff00';
} else {
$mask = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';
}
$ip = inet_ntop($packedAddress & inet_pton($mask));
if ($wrappedIPv6) {
$ip = '['.$ip.']';
}
return $ip;
}
}