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-rw-r--r--library/HTMLPurifier/AttrDef/URI/Host.php62
1 files changed, 62 insertions, 0 deletions
diff --git a/library/HTMLPurifier/AttrDef/URI/Host.php b/library/HTMLPurifier/AttrDef/URI/Host.php
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index 000000000..2156c10c6
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+++ b/library/HTMLPurifier/AttrDef/URI/Host.php
@@ -0,0 +1,62 @@
+<?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