129 lines
4.6 KiB
PHP
129 lines
4.6 KiB
PHP
<?php
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/**
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* Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
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*/
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class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
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{
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/**
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* IPv4 sub-validator.
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* @type HTMLPurifier_AttrDef_URI_IPv4
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*/
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protected $ipv4;
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/**
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* IPv6 sub-validator.
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* @type HTMLPurifier_AttrDef_URI_IPv6
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*/
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protected $ipv6;
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public function __construct()
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{
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$this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
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$this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
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}
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/**
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* @param string $string
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return bool|string
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*/
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public function validate($string, $config, $context)
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{
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$length = strlen($string);
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// empty hostname is OK; it's usually semantically equivalent:
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// the default host as defined by a URI scheme is used:
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//
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// If the URI scheme defines a default for host, then that
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// default applies when the host subcomponent is undefined
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// or when the registered name is empty (zero length).
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if ($string === '') {
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return '';
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}
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if ($length > 1 && $string[0] === '[' && $string[$length - 1] === ']') {
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//IPv6
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$ip = substr($string, 1, $length - 2);
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$valid = $this->ipv6->validate($ip, $config, $context);
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if ($valid === false) {
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return false;
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}
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return '[' . $valid . ']';
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}
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// need to do checks on unusual encodings too
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$ipv4 = $this->ipv4->validate($string, $config, $context);
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if ($ipv4 !== false) {
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return $ipv4;
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}
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// A regular domain name.
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// This doesn't match I18N domain names, but we don't have proper IRI support,
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// so force users to insert Punycode.
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// There is not a good sense in which underscores should be
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// allowed, since it's technically not! (And if you go as
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// far to allow everything as specified by the DNS spec...
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// well, that's literally everything, modulo some space limits
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// for the components and the overall name (which, by the way,
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// we are NOT checking!). So we (arbitrarily) decide this:
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// let's allow underscores wherever we would have allowed
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// hyphens, if they are enabled. This is a pretty good match
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// for browser behavior, for example, a large number of browsers
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// cannot handle foo_.example.com, but foo_bar.example.com is
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// fairly well supported.
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$underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';
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// The productions describing this are:
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$a = '[a-z]'; // alpha
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$an = '[a-z0-9]'; // alphanum
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$and = "[a-z0-9-$underscore]"; // alphanum | "-"
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// domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
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$domainlabel = "$an($and*$an)?";
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// toplabel = alpha | alpha *( alphanum | "-" ) alphanum
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$toplabel = "$a($and*$an)?";
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// hostname = *( domainlabel "." ) toplabel [ "." ]
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if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
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return $string;
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}
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// If we have Net_IDNA2 support, we can support IRIs by
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// punycoding them. (This is the most portable thing to do,
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// since otherwise we have to assume browsers support
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if ($config->get('Core.EnableIDNA')) {
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$idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true));
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// we need to encode each period separately
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$parts = explode('.', $string);
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try {
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$new_parts = array();
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foreach ($parts as $part) {
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$encodable = false;
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for ($i = 0, $c = strlen($part); $i < $c; $i++) {
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if (ord($part[$i]) > 0x7a) {
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$encodable = true;
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break;
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}
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}
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if (!$encodable) {
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$new_parts[] = $part;
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} else {
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$new_parts[] = $idna->encode($part);
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}
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}
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$string = implode('.', $new_parts);
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if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
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return $string;
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}
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} catch (Exception $e) {
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// XXX error reporting
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}
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}
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return false;
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}
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}
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// vim: et sw=4 sts=4
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