mirror of
https://github.com/renbaoshuo/S2OJ.git
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96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
90 lines
2.4 KiB
PHP
90 lines
2.4 KiB
PHP
<?php
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/**
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* Validates an IPv6 address.
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* @author Feyd @ forums.devnetwork.net (public domain)
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* @note This function requires brackets to have been removed from address
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* in URI.
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*/
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class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4
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{
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/**
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* @param string $aIP
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($aIP, $config, $context)
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{
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if (!$this->ip4) {
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$this->_loadRegex();
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}
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$original = $aIP;
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$hex = '[0-9a-fA-F]';
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$blk = '(?:' . $hex . '{1,4})';
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$pre = '(?:/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))'; // /0 - /128
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// prefix check
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if (strpos($aIP, '/') !== false) {
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if (preg_match('#' . $pre . '$#s', $aIP, $find)) {
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$aIP = substr($aIP, 0, 0 - strlen($find[0]));
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unset($find);
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} else {
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return false;
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}
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}
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// IPv4-compatiblity check
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if (preg_match('#(?<=:' . ')' . $this->ip4 . '$#s', $aIP, $find)) {
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$aIP = substr($aIP, 0, 0 - strlen($find[0]));
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$ip = explode('.', $find[0]);
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$ip = array_map('dechex', $ip);
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$aIP .= $ip[0] . $ip[1] . ':' . $ip[2] . $ip[3];
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unset($find, $ip);
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}
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// compression check
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$aIP = explode('::', $aIP);
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$c = count($aIP);
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if ($c > 2) {
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return false;
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} elseif ($c == 2) {
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list($first, $second) = $aIP;
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$first = explode(':', $first);
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$second = explode(':', $second);
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if (count($first) + count($second) > 8) {
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return false;
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}
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while (count($first) < 8) {
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array_push($first, '0');
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}
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array_splice($first, 8 - count($second), 8, $second);
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$aIP = $first;
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unset($first, $second);
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} else {
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$aIP = explode(':', $aIP[0]);
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}
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$c = count($aIP);
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if ($c != 8) {
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return false;
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}
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// All the pieces should be 16-bit hex strings. Are they?
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foreach ($aIP as $piece) {
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if (!preg_match('#^[0-9a-fA-F]{4}$#s', sprintf('%04s', $piece))) {
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return false;
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}
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}
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return $original;
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}
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}
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// vim: et sw=4 sts=4
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