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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Uid;
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/**
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* A v6 UUID is lexicographically sortable and contains a 60-bit timestamp and 62 extra unique bits.
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*
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* Unlike UUIDv1, this implementation of UUIDv6 doesn't leak the MAC address of the host.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class UuidV6 extends Uuid implements TimeBasedUidInterface
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{
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protected const TYPE = 6;
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private static string $node;
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public function __construct(string $uuid = null)
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{
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if (null === $uuid) {
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$this->uid = static::generate();
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} else {
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parent::__construct($uuid, true);
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}
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}
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public function getDateTime(): \DateTimeImmutable
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{
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return BinaryUtil::hexToDateTime('0'.substr($this->uid, 0, 8).substr($this->uid, 9, 4).substr($this->uid, 15, 3));
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}
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public function getNode(): string
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{
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return substr($this->uid, 24);
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}
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public static function generate(\DateTimeInterface $time = null, Uuid $node = null): string
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{
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$uuidV1 = UuidV1::generate($time, $node);
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$uuid = substr($uuidV1, 15, 3).substr($uuidV1, 9, 4).$uuidV1[0].'-'.substr($uuidV1, 1, 4).'-6'.substr($uuidV1, 5, 3).substr($uuidV1, 18, 6);
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if ($node) {
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return $uuid.substr($uuidV1, 24);
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}
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// uuid_create() returns a stable "node" that can leak the MAC of the host, but
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// UUIDv6 prefers a truly random number here, let's XOR both to preserve the entropy
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if (!isset(self::$node)) {
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$seed = [random_int(0, 0xFFFFFF), random_int(0, 0xFFFFFF)];
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$node = unpack('N2', hex2bin('00'.substr($uuidV1, 24, 6)).hex2bin('00'.substr($uuidV1, 30)));
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self::$node = sprintf('%06x%06x', ($seed[0] ^ $node[1]) | 0x010000, $seed[1] ^ $node[2]);
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}
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return $uuid.self::$node;
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}
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}
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