| 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 |
| 46: |