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Optional support for IDNAs with PEAR Net_IDNA2

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Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
This commit is contained in:
Edward Z. Yang
2012-01-06 05:28:00 -08:00
parent 94468f3c24
commit 974fe3f25e
9 changed files with 75 additions and 7 deletions
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45
library/HTMLPurifier/AttrDef/URI/Host.php
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@@ -44,9 +44,8 @@ class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
// 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.
// This doesn't match I18N domain names, but we don't have proper IRI support,
// so force users to insert Punycode.
// The productions describing this are:
$a = '[a-z]'; // alpha
@@ -57,10 +56,44 @@ class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
// toplabel = alpha | alpha *( alphanum | "-" ) alphanum
$toplabel = "$a($and*$an)?";
// hostname = *( domainlabel "." ) toplabel [ "." ]
$match = preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string);
if (!$match) return false;
if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
return $string;
}
return $string;
// If we have Net_IDNA2 support, we can support IRIs by
// punycoding them. (This is the most portable thing to do,
// since otherwise we have to assume browsers support
if ($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('.', $new_parts);
if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
return $string;
}
} catch (Exception $e) {
// XXX error reporting
}
}
return false;
}
}

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library/HTMLPurifier/ConfigSchema/schema.ser
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9
library/HTMLPurifier/ConfigSchema/schema/Core.EnableIDNA.txt Normal file
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@@ -0,0 +1,9 @@
Core.EnableIDNA
TYPE: bool
DEFAULT: false
VERSION: 4.4.0
--DESCRIPTION--
Allows international domain names in URLs. This configuration option
requires the PEAR Net_IDNA2 module to be installed. It operates by
punycoding any internationalized host names for maximum portability.
--# vim: et sw=4 sts=4