<?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\Generator;
use Ramsey\Uuid\Converter\TimeConverterInterface;
use Ramsey\Uuid\Exception\InvalidArgumentException;
use Ramsey\Uuid\Exception\RandomSourceException;
use Ramsey\Uuid\Exception\TimeSourceException;
use Ramsey\Uuid\Provider\NodeProviderInterface;
use Ramsey\Uuid\Provider\TimeProviderInterface;
use Ramsey\Uuid\Type\Hexadecimal;
use Throwable;
use function ctype_xdigit;
use function dechex;
use function hex2bin;
use function is_int;
use function pack;
use function sprintf;
use function str_pad;
use function strlen;
use const STR_PAD_LEFT;
/**
* DefaultTimeGenerator generates strings of binary data based on a node ID,
* clock sequence, and the current time
*/
class DefaultTimeGenerator implements TimeGeneratorInterface
{
/**
* @var NodeProviderInterface
*/
private $nodeProvider;
/**
* @var TimeConverterInterface
*/
private $timeConverter;
/**
* @var TimeProviderInterface
*/
private $timeProvider;
public function __construct(
NodeProviderInterface $nodeProvider,
TimeConverterInterface $timeConverter,
TimeProviderInterface $timeProvider
) {
$this->nodeProvider = $nodeProvider;
$this->timeConverter = $timeConverter;
$this->timeProvider = $timeProvider;
}
/**
* @throws InvalidArgumentException if the parameters contain invalid values
* @throws RandomSourceException if random_int() throws an exception/error
*
* @inheritDoc
*/
public function generate($node = null, ?int $clockSeq = null): string
{
if ($node instanceof Hexadecimal) {
$node = $node->toString();
}
$node = $this->getValidNode($node);
if ($clockSeq === null) {
try {
// This does not use "stable storage"; see RFC 4122, Section 4.2.1.1.
$clockSeq = random_int(0, 0x3fff);
} catch (Throwable $exception) {
throw new RandomSourceException(
$exception->getMessage(),
(int) $exception->getCode(),
$exception
);
}
}
$time = $this->timeProvider->getTime();
$uuidTime = $this->timeConverter->calculateTime(
$time->getSeconds()->toString(),
$time->getMicroseconds()->toString()
);
$timeHex = str_pad($uuidTime->toString(), 16, '0', STR_PAD_LEFT);
if (strlen($timeHex) !== 16) {
throw new TimeSourceException(sprintf(
'The generated time of \'%s\' is larger than expected',
$timeHex
));
}
$timeBytes = (string) hex2bin($timeHex);
return $timeBytes[4] . $timeBytes[5] . $timeBytes[6] . $timeBytes[7]
. $timeBytes[2] . $timeBytes[3]
. $timeBytes[0] . $timeBytes[1]
. pack('n*', $clockSeq)
. $node;
}
/**
* Uses the node provider given when constructing this instance to get
* the node ID (usually a MAC address)
*
* @param string|int|null $node A node value that may be used to override the node provider
*
* @return string 6-byte binary string representation of the node
*
* @throws InvalidArgumentException
*/
private function getValidNode($node): string
{
if ($node === null) {
$node = $this->nodeProvider->getNode();
}
// Convert the node to hex, if it is still an integer.
if (is_int($node)) {
$node = dechex($node);
}
if (!ctype_xdigit((string) $node) || strlen((string) $node) > 12) {
throw new InvalidArgumentException('Invalid node value');
}
return (string) hex2bin(str_pad((string) $node, 12, '0', STR_PAD_LEFT));
}
}