diff options
Diffstat (limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php')
| -rw-r--r-- | vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php new file mode 100644 index 0000000..e54a334 --- /dev/null +++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php @@ -0,0 +1,138 @@ +<?php + +/** + * Validates a host according to the IPv4, IPv6 and DNS (future) specifications. + */ +class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef +{ + + /** + * IPv4 sub-validator. + * @type HTMLPurifier_AttrDef_URI_IPv4 + */ + protected $ipv4; + + /** + * IPv6 sub-validator. + * @type HTMLPurifier_AttrDef_URI_IPv6 + */ + protected $ipv6; + + public function __construct() + { + $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4(); + $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6(); + } + + /** + * @param string $string + * @param HTMLPurifier_Config $config + * @param HTMLPurifier_Context $context + * @return bool|string + */ + public function validate($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. + + // There is not a good sense in which underscores should be + // allowed, since it's technically not! (And if you go as + // far to allow everything as specified by the DNS spec... + // well, that's literally everything, modulo some space limits + // for the components and the overall name (which, by the way, + // we are NOT checking!). So we (arbitrarily) decide this: + // let's allow underscores wherever we would have allowed + // hyphens, if they are enabled. This is a pretty good match + // for browser behavior, for example, a large number of browsers + // cannot handle foo_.example.com, but foo_bar.example.com is + // fairly well supported. + $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : ''; + + // Based off of RFC 1738, but amended so that + // as per RFC 3696, the top label need only not be all numeric. + // The productions describing this are: + $a = '[a-z]'; // alpha + $an = '[a-z0-9]'; // alphanum + $and = "[a-z0-9-$underscore]"; // alphanum | "-" + // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum + $domainlabel = "$an(?:$and*$an)?"; + // AMENDED as per RFC 3696 + // toplabel = alphanum | alphanum *( alphanum | "-" ) alphanum + // side condition: not all numeric + $toplabel = "$an(?:$and*$an)?"; + // hostname = *( domainlabel "." ) toplabel [ "." ] + if (preg_match("/^(?:$domainlabel\.)*($toplabel)\.?$/i", $string, $matches)) { + if (!ctype_digit($matches[1])) { + return $string; + } + } + + // PHP 5.3 and later support this functionality natively + if (function_exists('idn_to_ascii')) { + $string = idn_to_ascii($string, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46); + + // 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 + } elseif ($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); + } catch (Exception $e) { + // XXX error reporting + } + } + // Try again + if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) { + return $string; + } + return false; + } +} + +// vim: et sw=4 sts=4 |