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<?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\Exception\InvalidArgumentException;
use Ramsey\Uuid\Fields\SerializableFieldsTrait;
use Ramsey\Uuid\Type\Hexadecimal;
use Ramsey\Uuid\Uuid;
use function bin2hex;
use function dechex;
use function hexdec;
use function sprintf;
use function str_pad;
use function strlen;
use function substr;
use function unpack;
use const STR_PAD_LEFT;
/**
* RFC 4122 variant UUIDs are comprised of a set of named fields
*
* Internally, this class represents the fields together as a 16-byte binary
* string.
*
* @psalm-immutable
*/
final class Fields implements FieldsInterface
{
use NilTrait;
use SerializableFieldsTrait;
use VariantTrait;
use VersionTrait;
/**
* @var string
*/
private $bytes;
/**
* @param string $bytes A 16-byte binary string representation of a UUID
*
* @throws InvalidArgumentException if the byte string is not exactly 16 bytes
* @throws InvalidArgumentException if the byte string does not represent an RFC 4122 UUID
* @throws InvalidArgumentException if the byte string does not contain a valid version
*/
public function __construct(string $bytes)
{
if (strlen($bytes) !== 16) {
throw new InvalidArgumentException(
'The byte string must be 16 bytes long; '
. 'received ' . strlen($bytes) . ' bytes'
);
}
$this->bytes = $bytes;
if (!$this->isCorrectVariant()) {
throw new InvalidArgumentException(
'The byte string received does not conform to the RFC 4122 variant'
);
}
if (!$this->isCorrectVersion()) {
throw new InvalidArgumentException(
'The byte string received does not contain a valid RFC 4122 version'
);
}
}
public function getBytes(): string
{
return $this->bytes;
}
public function getClockSeq(): Hexadecimal
{
$clockSeq = hexdec(bin2hex(substr($this->bytes, 8, 2))) & 0x3fff;
return new Hexadecimal(str_pad(dechex($clockSeq), 4, '0', STR_PAD_LEFT));
}
public function getClockSeqHiAndReserved(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 8, 1)));
}
public function getClockSeqLow(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 9, 1)));
}
public function getNode(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 10)));
}
public function getTimeHiAndVersion(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 6, 2)));
}
public function getTimeLow(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 0, 4)));
}
public function getTimeMid(): Hexadecimal
{
return new Hexadecimal(bin2hex(substr($this->bytes, 4, 2)));
}
/**
* Returns the full 60-bit timestamp, without the version
*
* For version 2 UUIDs, the time_low field is the local identifier and
* should not be returned as part of the time. For this reason, we set the
* bottom 32 bits of the timestamp to 0's. As a result, there is some loss
* of fidelity of the timestamp, for version 2 UUIDs. The timestamp can be
* off by a range of 0 to 429.4967295 seconds (or 7 minutes, 9 seconds, and
* 496730 microseconds).
*
* For version 6 UUIDs, the timestamp order is reversed from the typical RFC
* 4122 order (the time bits are in the correct bit order, so that it is
* monotonically increasing). In returning the timestamp value, we put the
* bits in the order: time_low + time_mid + time_hi.
*/
public function getTimestamp(): Hexadecimal
{
switch ($this->getVersion()) {
case Uuid::UUID_TYPE_DCE_SECURITY:
$timestamp = sprintf(
'%03x%04s%08s',
hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff,
$this->getTimeMid()->toString(),
''
);
break;
case Uuid::UUID_TYPE_PEABODY:
$timestamp = sprintf(
'%08s%04s%03x',
$this->getTimeLow()->toString(),
$this->getTimeMid()->toString(),
hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff
);
break;
default:
$timestamp = sprintf(
'%03x%04s%08s',
hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff,
$this->getTimeMid()->toString(),
$this->getTimeLow()->toString()
);
}
return new Hexadecimal($timestamp);
}
public function getVersion(): ?int
{
if ($this->isNil()) {
return null;
}
/** @var array $parts */
$parts = unpack('n*', $this->bytes);
return (int) $parts[4] >> 12;
}
private function isCorrectVariant(): bool
{
if ($this->isNil()) {
return true;
}
return $this->getVariant() === Uuid::RFC_4122;
}
}
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