mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-12-24 01:01:53 +00:00
63 lines
2.0 KiB
PHP
63 lines
2.0 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);
|
|
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 breaks I18N domain names, but we don't have proper IRI support,
|
|
// so force users to insert Punycode. If there's complaining we'll
|
|
// try to fix things into an international friendly form.
|
|
|
|
// 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 [ "." ]
|
|
$match = preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string);
|
|
if (!$match) return false;
|
|
|
|
return $string;
|
|
}
|
|
|
|
}
|
|
|
|
// vim: et sw=4 sts=4
|