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<?php

/**

* Validates an IPv6 address.

* @author Feyd @ forums.devnetwork.net (public domain)

* @note This function requires brackets to have been removed from address

*       in URI.

class HTMLPurifier_AttrDef_URI_IPv6 extends HTMLPurifier_AttrDef_URI_IPv4

{

/**

* @param string $aIP

* @param HTMLPurifier_Config $config

* @param HTMLPurifier_Context $context

* @return bool|string

public function validate($aIP, $config, $context)

{

if (!$this->ip4) {

$this->_loadRegex();

}

$original = $aIP;

$hex = '[0-9a-fA-F]';

$blk = '(?:' . $hex . '{1,4})';

$pre = '(?:/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))'; // /0 - /128

//      prefix check

if (strpos($aIP, '/') !== false) {

if (preg_match('#' . $pre . '$#s', $aIP, $find)) {

$aIP = substr($aIP, 0, 0 - strlen($find[0]));

unset($find);

} else {

return false;

}

//      IPv4-compatiblity check

if (preg_match('#(?<=:' . ')' . $this->ip4 . '$#s', $aIP, $find)) {

$aIP = substr($aIP, 0, 0 - strlen($find[0]));

$ip = explode('.', $find[0]);

$ip = array_map('dechex', $ip);

$aIP .= $ip[0] . $ip[1] . ':' . $ip[2] . $ip[3];

unset($find, $ip);

}

//      compression check

$aIP = explode('::', $aIP);

$c = count($aIP);

if ($c > 2) {

return false;

} elseif ($c == 2) {

list($first, $second) = $aIP;

$first = explode(':', $first);

$second = explode(':', $second);

if (count($first) + count($second) > 8) {

return false;

}

while (count($first) < 8) {

array_push($first, '0');

}

array_splice($first, 8 - count($second), 8, $second);

$aIP = $first;

unset($first, $second);

} else {

$aIP = explode(':', $aIP[0]);

}

$c = count($aIP);

if ($c != 8) {

return false;

}

//      All the pieces should be 16-bit hex strings. Are they?

foreach ($aIP as $piece) {

if (!preg_match('#^[0-9a-fA-F]{4}$#s', sprintf('%04s', $piece))) {

return false;

}

return $original;

}

// vim: et sw=4 sts=4

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