library/HTMLPurifier/AttrDef/URI/IPv4.php

   1 <?php
   2
   3 /**
   4  * Validates an IPv4 address
   5  * @author Feyd @ forums.devnetwork.net (public domain)
   6  */
   7 class HTMLPurifier_AttrDef_URI_IPv4 extends HTMLPurifier_AttrDef
   8 {
   9
  10     /**
  11      * IPv4 regex, protected so that IPv6 can reuse it.
  12      * @type string
  13      */
  14     protected $ip4;
  15
  16     /**
  17      * @param string $aIP
  18      * @param HTMLPurifier_Config $config
  19      * @param HTMLPurifier_Context $context
  20      * @return bool|string
  21      */
  22     public function validate($aIP, $config, $context)
  23     {
  24         if (!$this->ip4) {
  25             $this->_loadRegex();
  26         }
  27
  28         if (preg_match('#^' . $this->ip4 . '$#s', $aIP)) {
  29             return $aIP;
  30         }
  31         return false;
  32     }
  33
  34     /**
  35      * Lazy load function to prevent regex from being stuffed in
  36      * cache.
  37      */
  38     protected function _loadRegex()
  39     {
  40         $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
  41         $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
  42     }
  43 }
  44
  45 // vim: et sw=4 sts=4