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<?php

/**

* Validates an IPv4 address

* @author Feyd @ forums.devnetwork.net (public domain)

class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef

{

/**

* IPv4 regex, protected so that IPv6 can reuse it.

* @type string

protected $ip4;

/**

* @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();

}

if (preg_match('#^' . $this->ip4 . '$#s', $aIP)) {

return $aIP;

}

return false;

}

/**

* Lazy load function to prevent regex from being stuffed in

* cache.

protected function _loadRegex()

{

$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

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