63 lines
2 KiB
PHP
63 lines
2 KiB
PHP
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<?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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* Instance of HTMLPurifier_AttrDef_URI_IPv4 sub-validator
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*/
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protected $ipv4;
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/**
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* Instance of HTMLPurifier_AttrDef_URI_IPv6 sub-validator
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*/
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protected $ipv6;
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public function __construct() {
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$this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
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$this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
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}
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public function validate($string, $config, $context) {
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$length = strlen($string);
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if ($string === '') return '';
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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) return false;
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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) return $ipv4;
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// A regular domain name.
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// This breaks I18N domain names, but we don't have proper IRI support,
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// so force users to insert Punycode. If there's complaining we'll
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// try to fix things into an international friendly form.
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// The productions describing this are:
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$a = '[a-z]'; // alpha
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$an = '[a-z0-9]'; // alphanum
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$and = '[a-z0-9-]'; // 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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$match = preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string);
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if (!$match) return false;
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return $string;
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}
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}
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// vim: et sw=4 sts=4
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