friendica/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/IPv4.php

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<?php
/**
* Validates an IPv4 address
* @author Feyd @ forums.devnetwork.net (public domain)
*/
class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
{
/**
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* IPv4 regex, protected so that IPv6 can reuse it.
* @type string
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*/
protected $ip4;
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/**
* @param string $aIP
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return bool|string
*/
public function validate($aIP, $config, $context)
{
if (!$this->ip4) {
$this->_loadRegex();
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}
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if (preg_match('#^' . $this->ip4 . '$#s', $aIP)) {
return $aIP;
}
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return false;
}
/**
* Lazy load function to prevent regex from being stuffed in
* cache.
*/
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protected function _loadRegex()
{
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$oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
$this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
}
}
// vim: et sw=4 sts=4