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https://github.com/renbaoshuo/S2OJ.git
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46 lines
998 B
PHP
46 lines
998 B
PHP
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<?php
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/**
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* Validates an IPv4 address
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* @author Feyd @ forums.devnetwork.net (public domain)
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*/
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class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
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{
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/**
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* IPv4 regex, protected so that IPv6 can reuse it.
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* @type string
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*/
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protected $ip4;
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/**
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* @param string $aIP
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($aIP, $config, $context)
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{
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if (!$this->ip4) {
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$this->_loadRegex();
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}
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if (preg_match('#^' . $this->ip4 . '$#s', $aIP)) {
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return $aIP;
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}
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return false;
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}
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/**
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* Lazy load function to prevent regex from being stuffed in
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* cache.
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*/
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protected function _loadRegex()
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{
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$oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
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$this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
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}
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}
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// vim: et sw=4 sts=4
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