102 lines
3.5 KiB
PHP
102 lines
3.5 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
|
||
|
|
*/
|
||
|
|
class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
|
||
|
|
{
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Instance of HTMLPurifier_AttrDef_URI_IPv4 sub-validator
|
||
|
|
*/
|
||
|
|
protected $ipv4;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Instance of HTMLPurifier_AttrDef_URI_IPv6 sub-validator
|
||
|
|
*/
|
||
|
|
protected $ipv6;
|
||
|
|
|
||
|
|
public function __construct() {
|
||
|
|
$this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
|
||
|
|
$this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
|
||
|
|
}
|
||
|
|
|
||
|
|
public function validate($string, $config, $context) {
|
||
|
|
$length = strlen($string);
|
||
|
|
// empty hostname is OK; it's usually semantically equivalent:
|
||
|
|
// the default host as defined by a URI scheme is used:
|
||
|
|
//
|
||
|
|
// If the URI scheme defines a default for host, then that
|
||
|
|
// default applies when the host subcomponent is undefined
|
||
|
|
// or when the registered name is empty (zero length).
|
||
|
|
if ($string === '') return '';
|
||
|
|
if ($length > 1 && $string[0] === '[' && $string[$length-1] === ']') {
|
||
|
|
//IPv6
|
||
|
|
$ip = substr($string, 1, $length - 2);
|
||
|
|
$valid = $this->ipv6->validate($ip, $config, $context);
|
||
|
|
if ($valid === false) return false;
|
||
|
|
return '['. $valid . ']';
|
||
|
|
}
|
||
|
|
|
||
|
|
// need to do checks on unusual encodings too
|
||
|
|
$ipv4 = $this->ipv4->validate($string, $config, $context);
|
||
|
|
if ($ipv4 !== false) return $ipv4;
|
||
|
|
|
||
|
|
// A regular domain name.
|
||
|
|
|
||
|
|
// This doesn't match I18N domain names, but we don't have proper IRI support,
|
||
|
|
// so force users to insert Punycode.
|
||
|
|
|
||
|
|
// The productions describing this are:
|
||
|
|
$a = '[a-z]'; // alpha
|
||
|
|
$an = '[a-z0-9]'; // alphanum
|
||
|
|
$and = '[a-z0-9-]'; // alphanum | "-"
|
||
|
|
// domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
|
||
|
|
$domainlabel = "$an($and*$an)?";
|
||
|
|
// toplabel = alpha | alpha *( alphanum | "-" ) alphanum
|
||
|
|
$toplabel = "$a($and*$an)?";
|
||
|
|
// hostname = *( domainlabel "." ) toplabel [ "." ]
|
||
|
|
if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
|
||
|
|
return $string;
|
||
|
|
}
|
||
|
|
|
||
|
|
// If we have Net_IDNA2 support, we can support IRIs by
|
||
|
|
// punycoding them. (This is the most portable thing to do,
|
||
|
|
// since otherwise we have to assume browsers support
|
||
|
|
|
||
|
|
if ($config->get('Core.EnableIDNA')) {
|
||
|
|
$idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true));
|
||
|
|
// we need to encode each period separately
|
||
|
|
$parts = explode('.', $string);
|
||
|
|
try {
|
||
|
|
$new_parts = array();
|
||
|
|
foreach ($parts as $part) {
|
||
|
|
$encodable = false;
|
||
|
|
for ($i = 0, $c = strlen($part); $i < $c; $i++) {
|
||
|
|
if (ord($part[$i]) > 0x7a) {
|
||
|
|
$encodable = true;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$encodable) {
|
||
|
|
$new_parts[] = $part;
|
||
|
|
} else {
|
||
|
|
$new_parts[] = $idna->encode($part);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$string = implode('.', $new_parts);
|
||
|
|
if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
|
||
|
|
return $string;
|
||
|
|
}
|
||
|
|
} catch (Exception $e) {
|
||
|
|
// XXX error reporting
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// vim: et sw=4 sts=4
|