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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\Generator; use Brick\Math\BigInteger; use DateTimeImmutable; use DateTimeInterface; use Ramsey\Uuid\Type\Hexadecimal; use function hash; use function pack; use function str_pad; use function strlen; use function substr; use function substr_replace; use function unpack; use const PHP_INT_SIZE; use const STR_PAD_LEFT; /** * UnixTimeGenerator generates bytes that combine a 48-bit timestamp in * milliseconds since the Unix Epoch with 80 random bits * * Code and concepts within this class are borrowed from the symfony/uid package * and are used under the terms of the MIT license distributed with symfony/uid. * * symfony/uid is copyright (c) Fabien Potencier. * * @link https://symfony.com/components/Uid Symfony Uid component * @link https://github.com/symfony/uid/blob/4f9f537e57261519808a7ce1d941490736522bbc/UuidV7.php Symfony UuidV7 class * @link https://github.com/symfony/uid/blob/6.2/LICENSE MIT License */ class UnixTimeGenerator implements TimeGeneratorInterface { private static string $time = ''; private static ?string $seed = null; private static int $seedIndex = 0; /** @var int[] */ private static array $rand = []; /** @var int[] */ private static array $seedParts; public function __construct( private RandomGeneratorInterface $randomGenerator, private int $intSize = PHP_INT_SIZE ) { } /** * @param Hexadecimal|int|string|null $node Unused in this generator * @param int|null $clockSeq Unused in this generator * @param DateTimeInterface $dateTime A date-time instance to use when * generating bytes * * @inheritDoc */ public function generate($node = null, ?int $clockSeq = null, ?DateTimeInterface $dateTime = null): string { $time = ($dateTime ?? new DateTimeImmutable('now'))->format('Uv'); if ($time > self::$time || ($dateTime !== null && $time !== self::$time)) { $this->randomize($time); } else { $time = $this->increment(); } if ($this->intSize >= 8) { $time = substr(pack('J', (int) $time), -6); } else { $time = str_pad(BigInteger::of($time)->toBytes(false), 6, "\x00", STR_PAD_LEFT); } /** @var non-empty-string */ return $time . pack('n*', self::$rand[1], self::$rand[2], self::$rand[3], self::$rand[4], self::$rand[5]); } private function randomize(string $time): void { if (self::$seed === null) { $seed = $this->randomGenerator->generate(16); self::$seed = $seed; } else { $seed = $this->randomGenerator->generate(10); } /** @var int[] $rand */ $rand = unpack('n*', $seed); $rand[1] &= 0x03ff; self::$rand = $rand; self::$time = $time; } /** * Special thanks to Nicolas Grekas for sharing the following information: * * Within the same ms, we increment the rand part by a random 24-bit number. * * Instead of getting this number from random_bytes(), which is slow, we get * it by sha512-hashing self::$seed. This produces 64 bytes of entropy, * which we need to split in a list of 24-bit numbers. unpack() first splits * them into 16 x 32-bit numbers; we take the first byte of each of these * numbers to get 5 extra 24-bit numbers. Then, we consume those numbers * one-by-one and run this logic every 21 iterations. * * self::$rand holds the random part of the UUID, split into 5 x 16-bit * numbers for x86 portability. We increment this random part by the next * 24-bit number in the self::$seedParts list and decrement * self::$seedIndex. * * @link https://twitter.com/nicolasgrekas/status/1583356938825261061 Tweet from Nicolas Grekas */ private function increment(): string { if (self::$seedIndex === 0 && self::$seed !== null) { self::$seed = hash('sha512', self::$seed, true); /** @var int[] $s */ $s = unpack('l*', self::$seed); $s[] = ($s[1] >> 8 & 0xff0000) | ($s[2] >> 16 & 0xff00) | ($s[3] >> 24 & 0xff); $s[] = ($s[4] >> 8 & 0xff0000) | ($s[5] >> 16 & 0xff00) | ($s[6] >> 24 & 0xff); $s[] = ($s[7] >> 8 & 0xff0000) | ($s[8] >> 16 & 0xff00) | ($s[9] >> 24 & 0xff); $s[] = ($s[10] >> 8 & 0xff0000) | ($s[11] >> 16 & 0xff00) | ($s[12] >> 24 & 0xff); $s[] = ($s[13] >> 8 & 0xff0000) | ($s[14] >> 16 & 0xff00) | ($s[15] >> 24 & 0xff); self::$seedParts = $s; self::$seedIndex = 21; } self::$rand[5] = 0xffff & $carry = self::$rand[5] + (self::$seedParts[self::$seedIndex--] & 0xffffff); self::$rand[4] = 0xffff & $carry = self::$rand[4] + ($carry >> 16); self::$rand[3] = 0xffff & $carry = self::$rand[3] + ($carry >> 16); self::$rand[2] = 0xffff & $carry = self::$rand[2] + ($carry >> 16); self::$rand[1] += $carry >> 16; if (0xfc00 & self::$rand[1]) { $time = self::$time; $mtime = (int) substr($time, -9); if ($this->intSize >= 8 || strlen($time) < 10) { $time = (string) ((int) $time + 1); } elseif ($mtime === 999999999) { $time = (1 + (int) substr($time, 0, -9)) . '000000000'; } else { $mtime++; $time = substr_replace($time, str_pad((string) $mtime, 9, '0', STR_PAD_LEFT), -9); } $this->randomize($time); } return self::$time; } }