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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