<?php
/**
* This file is part of the ramsey/uuid library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Uuid\Rfc4122;
use Ramsey\Uuid\Codec\CodecInterface;
use Ramsey\Uuid\Converter\NumberConverterInterface;
use Ramsey\Uuid\Converter\TimeConverterInterface;
use Ramsey\Uuid\Exception\InvalidArgumentException;
use Ramsey\Uuid\Rfc4122\FieldsInterface as Rfc4122FieldsInterface;
use Ramsey\Uuid\Type\Integer as IntegerObject;
use Ramsey\Uuid\Uuid;
use function hexdec;
/**
* DCE Security version, or version 2, UUIDs include local domain identifier, local ID for the specified domain, and
* node values that are combined into a 128-bit unsigned integer
*
* It is important to note that a version 2 UUID suffers from some loss of timestamp fidelity, due to replacing the
* time_low field with the local identifier. When constructing the timestamp value for date purposes, we replace the
* local identifier bits with zeros. As a result, the timestamp can be off by a range of 0 to 429.4967295 seconds (or 7
* minutes, 9 seconds, and 496,730 microseconds).
*
* Astute observers might note this value directly corresponds to `2^32-1`, or `0xffffffff`. The local identifier is
* 32-bits, and we have set each of these bits to `0`, so the maximum range of timestamp drift is `0x00000000` to
* `0xffffffff` (counted in 100-nanosecond intervals).
*
* @link https://www.rfc-editor.org/rfc/rfc9562#section-5.2 RFC 9562, 5.2. UUID Version 2
* @link https://publications.opengroup.org/c311 DCE 1.1: Authentication and Security Services
* @link https://publications.opengroup.org/c706 DCE 1.1: Remote Procedure Call
* @link https://pubs.opengroup.org/onlinepubs/9696989899/chap5.htm#tagcjh_08_02_01_01 DCE 1.1: Auth & Sec, §5.2.1.1
* @link https://pubs.opengroup.org/onlinepubs/9696989899/chap11.htm#tagcjh_14_05_01_01 DCE 1.1: Auth & Sec, §11.5.1.1
* @link https://pubs.opengroup.org/onlinepubs/9629399/apdxa.htm DCE 1.1: RPC, Appendix A
* @link https://github.com/google/uuid Go package for UUIDs (includes DCE implementation)
*
* @immutable
*/
final class UuidV2 extends Uuid implements UuidInterface
{
use TimeTrait;
/**
* Creates a version 2 (DCE Security) UUID
*
* @param Rfc4122FieldsInterface $fields The fields from which to construct a UUID
* @param NumberConverterInterface $numberConverter The number converter to use for converting hex values to/from integers
* @param CodecInterface $codec The codec to use when encoding or decoding UUID strings
* @param TimeConverterInterface $timeConverter The time converter to use for converting timestamps extracted from a
* UUID to unix timestamps
*/
public function __construct(
Rfc4122FieldsInterface $fields,
NumberConverterInterface $numberConverter,
CodecInterface $codec,
TimeConverterInterface $timeConverter,
) {
if ($fields->getVersion() !== Uuid::UUID_TYPE_DCE_SECURITY) {
throw new InvalidArgumentException(
'Fields used to create a UuidV2 must represent a version 2 (DCE Security) UUID'
);
}
parent::__construct($fields, $numberConverter, $codec, $timeConverter);
}
/**
* Returns the local domain used to create this version 2 UUID
*/
public function getLocalDomain(): int
{
/** @var Rfc4122FieldsInterface $fields */
$fields = $this->getFields();
return (int) hexdec($fields->getClockSeqLow()->toString());
}
/**
* Returns the string name of the local domain
*/
public function getLocalDomainName(): string
{
return Uuid::DCE_DOMAIN_NAMES[$this->getLocalDomain()];
}
/**
* Returns the local identifier for the domain used to create this version 2 UUID
*/
public function getLocalIdentifier(): IntegerObject
{
/** @var Rfc4122FieldsInterface $fields */
$fields = $this->getFields();
return new IntegerObject($this->numberConverter->fromHex($fields->getTimeLow()->toString()));
}
}
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