lib/htmlpurifier/HTMLPurifier/AttrDef/URI/IPv4.php

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