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<?php
/**
* Copyright 2014-2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (BSD). If you
* did not receive this file, see http://www.horde.org/licenses/bsd.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/bsd BSD
* @package Idna
*/
/**
* Provide normalized encoding/decoding support for IDNA strings.
*
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @copyright 2014-2017 Horde LLC
* @license http://www.horde.org/licenses/bsd BSD
* @package Idna
*/
class Horde_Idna
{
/**
* The backend to use.
*
* @var mixed
*/
protected static $_backend;
/**
* @throws Horde_Idna_Exception
*/
public static function encode($data)
{
switch ($backend = static::_getBackend()) {
case 'INTL':
return idn_to_ascii($data);
case 'INTL_UTS46':
$result = idn_to_ascii($data, 0, INTL_IDNA_VARIANT_UTS46, $info);
self::_checkForError($info);
return $result;
default:
return $backend->encode($data);
}
}
/**
* @throws Horde_Idna_Exception
*/
public static function decode($data)
{
switch ($backend = static::_getBackend()) {
case 'INTL':
case 'INTL_UTS46':
$parts = explode('.', $data);
foreach ($parts as &$part) {
if (strpos($part, 'xn--') === 0) {
switch ($backend) {
case 'INTL':
$part = idn_to_utf8($part);
break;
case 'INTL_UTS46':
$part = idn_to_utf8($part, 0, INTL_IDNA_VARIANT_UTS46, $info);
self::_checkForError($info);
break;
}
}
}
return implode('.', $parts);
default:
return $backend->decode($data);
}
}
/**
* Checks if the $idna_info parameter of idn_to_ascii() or idn_to_utf8()
* contains errors.
*
* @param array $info Fourth parameter to idn_to_ascii() or idn_to_utf8().
*
* @throws Horde_Idna_Exception
*/
protected static function _checkForError($info)
{
switch (true) {
case $info['errors'] & IDNA_ERROR_EMPTY_LABEL:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Domain name is empty"
));
case $info['errors'] & IDNA_ERROR_LABEL_TOO_LONG:
case $info['errors'] & IDNA_ERROR_DOMAIN_NAME_TOO_LONG:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Domain name is too long"
));
case $info['errors'] & IDNA_ERROR_LEADING_HYPHEN:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Starts with a hyphen"
));
case $info['errors'] & IDNA_ERROR_TRAILING_HYPHEN:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Ends with a hyphen"
));
case $info['errors'] & IDNA_ERROR_HYPHEN_3_4:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Contains hyphen in the third and fourth positions"
));
case $info['errors'] & IDNA_ERROR_LEADING_COMBINING_MARK:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Starts with a combining mark"
));
case $info['errors'] & IDNA_ERROR_DISALLOWED:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Contains disallowed characters"
));
case $info['errors'] & IDNA_ERROR_PUNYCODE:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Starts with \"xn--\" but does not contain valid Punycode"
));
case $info['errors'] & IDNA_ERROR_LABEL_HAS_DOT:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Contains a dot"
));
case $info['errors'] & IDNA_ERROR_INVALID_ACE_LABEL:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"ACE label does not contain a valid label string"
));
case $info['errors'] & IDNA_ERROR_BIDI:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Does not meet the IDNA BiDi requirements (for right-to-left characters)"
));
case $info['errors'] & IDNA_ERROR_CONTEXTJ:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Does not meet the IDNA CONTEXTJ requirements"
));
case $info['errors']:
throw new Horde_Idna_Exception(Horde_Idna_Translation::t(
"Unknown error"
));
}
}
/**
* Return the IDNA backend.
*
* @return mixed IDNA backend (false if none available).
*/
protected static function _getBackend()
{
if (!isset(self::$_backend)) {
if (extension_loaded('intl')) {
/* Only available in PHP > 5.4.0 */
self::$_backend = defined('INTL_IDNA_VARIANT_UTS46')
? 'INTL_UTS46'
: 'INTL';
} else {
self::$_backend = new Horde_Idna_Punycode();
}
}
return self::$_backend;
}
}