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