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<?php
/**
* League.Uri (https://uri.thephpleague.com)
*
* (c) Ignace Nyamagana Butera <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace League\Uri\Idna;
use League\Uri\Exceptions\ConversionFailed;
use League\Uri\Exceptions\SyntaxError;
use League\Uri\FeatureDetection;
use Stringable;
use function idn_to_ascii;
use function idn_to_utf8;
use function rawurldecode;
use const INTL_IDNA_VARIANT_UTS46;
/**
* @see https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/uidna_8h.html
*/
final class Converter
{
private const REGEXP_IDNA_PATTERN = '/[^\x20-\x7f]/';
private const MAX_DOMAIN_LENGTH = 253;
private const MAX_LABEL_LENGTH = 63;
/**
* General registered name regular expression.
*
* @see https://tools.ietf.org/html/rfc3986#section-3.2.2
* @see https://regex101.com/r/fptU8V/1
*/
private const REGEXP_REGISTERED_NAME = '/
(?(DEFINE)
(?<unreserved>[a-z0-9_~\-]) # . is missing as it is used to separate labels
(?<sub_delims>[!$&\'()*+,;=])
(?<encoded>%[A-F0-9]{2})
(?<reg_name>(?:(?&unreserved)|(?&sub_delims)|(?&encoded))*)
)
^(?:(?®_name)\.)*(?®_name)\.?$
/ix';
/**
* Converts the input to its IDNA ASCII form or throw on failure.
*
* @see Converter::toAscii()
*
* @throws SyntaxError if the string cannot be converted to UNICODE using IDN UTS46 algorithm
* @throws ConversionFailed if the conversion returns error
*/
public static function toAsciiOrFail(Stringable|string $domain, Option|int|null $options = null): string
{
$result = self::toAscii($domain, $options);
return match (true) {
$result->hasErrors() => throw ConversionFailed::dueToIdnError($domain, $result),
default => $result->domain(),
};
}
/**
* Converts the input to its IDNA ASCII form.
*
* This method returns the string converted to IDN ASCII form
*
* @throws SyntaxError if the string cannot be converted to ASCII using IDN UTS46 algorithm
*/
public static function toAscii(Stringable|string $domain, Option|int|null $options = null): Result
{
$domain = rawurldecode((string) $domain);
if (1 === preg_match(self::REGEXP_IDNA_PATTERN, $domain)) {
FeatureDetection::supportsIdn();
$flags = match (true) {
null === $options => Option::forIDNA2008Ascii(),
$options instanceof Option => $options,
default => Option::new($options),
};
idn_to_ascii($domain, $flags->toBytes(), INTL_IDNA_VARIANT_UTS46, $idnaInfo);
if ([] === $idnaInfo) {
return Result::fromIntl([
'result' => strtolower($domain),
'isTransitionalDifferent' => false,
'errors' => self::validateDomainAndLabelLength($domain),
]);
}
return Result::fromIntl($idnaInfo);
}
$error = Error::NONE->value;
if (1 !== preg_match(self::REGEXP_REGISTERED_NAME, $domain)) {
$error |= Error::DISALLOWED->value;
}
return Result::fromIntl([
'result' => strtolower($domain),
'isTransitionalDifferent' => false,
'errors' => self::validateDomainAndLabelLength($domain) | $error,
]);
}
/**
* Converts the input to its IDNA UNICODE form or throw on failure.
*
* @see Converter::toUnicode()
*
* @throws ConversionFailed if the conversion returns error
*/
public static function toUnicodeOrFail(Stringable|string $domain, Option|int|null $options = null): string
{
$result = self::toUnicode($domain, $options);
return match (true) {
$result->hasErrors() => throw ConversionFailed::dueToIdnError($domain, $result),
default => $result->domain(),
};
}
/**
* Converts the input to its IDNA UNICODE form.
*
* This method returns the string converted to IDN UNICODE form
*
* @throws SyntaxError if the string cannot be converted to UNICODE using IDN UTS46 algorithm
*/
public static function toUnicode(Stringable|string $domain, Option|int|null $options = null): Result
{
$domain = rawurldecode((string) $domain);
if (false === stripos($domain, 'xn--')) {
return Result::fromIntl(['result' => $domain, 'isTransitionalDifferent' => false, 'errors' => Error::NONE->value]);
}
FeatureDetection::supportsIdn();
$flags = match (true) {
null === $options => Option::forIDNA2008Unicode(),
$options instanceof Option => $options,
default => Option::new($options),
};
idn_to_utf8($domain, $flags->toBytes(), INTL_IDNA_VARIANT_UTS46, $idnaInfo);
if ([] === $idnaInfo) {
return Result::fromIntl(['result' => $domain, 'isTransitionalDifferent' => false, 'errors' => Error::NONE->value]);
}
return Result::fromIntl($idnaInfo);
}
/**
* Tells whether the submitted host is a valid IDN regardless of its format.
*
* Returns false if the host is invalid or if its conversion yield the same result
*/
public static function isIdn(Stringable|string|null $domain): bool
{
$domain = strtolower(rawurldecode((string) $domain));
$result = match (1) {
preg_match(self::REGEXP_IDNA_PATTERN, $domain) => self::toAscii($domain),
default => self::toUnicode($domain),
};
return match (true) {
$result->hasErrors() => false,
default => $result->domain() !== $domain,
};
}
/**
* Adapted from https://github.com/TRowbotham/idna.
*
* @see https://github.com/TRowbotham/idna/blob/master/src/Idna.php#L236
*/
private static function validateDomainAndLabelLength(string $domain): int
{
$error = Error::NONE->value;
$labels = explode('.', $domain);
$maxDomainSize = self::MAX_DOMAIN_LENGTH;
$length = count($labels);
// If the last label is empty, and it is not the first label, then it is the root label.
// Increase the max size by 1, making it 254, to account for the root label's "."
// delimiter. This also means we don't need to check the last label's length for being too
// long.
if ($length > 1 && '' === $labels[$length - 1]) {
++$maxDomainSize;
array_pop($labels);
}
if (strlen($domain) > $maxDomainSize) {
$error |= Error::DOMAIN_NAME_TOO_LONG->value;
}
foreach ($labels as $label) {
if (strlen($label) > self::MAX_LABEL_LENGTH) {
$error |= Error::LABEL_TOO_LONG->value;
break;
}
}
return $error;
}
}