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      */
  13     protected $ip4;
  14
  15     public function validate($aIP, $config, $context) {
  16
  17         if (!$this->ip4) $this->_loadRegex();
  18
  19         if (preg_match('#^' . $this->ip4 . '$#s', $aIP))
  20         {
  21                 return $aIP;
  22         }
  23
  24         return false;
  25
  26     }
  27
  28     /**
  29      * Lazy load function to prevent regex from being stuffed in
  30      * cache.
  31      */
  32     protected function _loadRegex() {
  33         $oct = '(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])'; // 0-255
  34         $this->ip4 = "(?:{$oct}\\.{$oct}\\.{$oct}\\.{$oct})";
  35     }
  36
  37 }
  38
  39 // vim: et sw=4 sts=4