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010efc9b AD |
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 |