1 files changed, 133 insertions, 16 deletions
diff --git a/vendor/ramsey/uuid/src/Generator/UnixTimeGenerator.php b/vendor/ramsey/uuid/src/Generator/UnixTimeGenerator.php
index 1aef8699a..af94decf2 100644
--- a/vendor/ramsey/uuid/src/Generator/UnixTimeGenerator.php
+++ b/vendor/ramsey/uuid/src/Generator/UnixTimeGenerator.php
@@ -14,39 +14,156 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Generator;
 
-use Ramsey\Uuid\Converter\TimeConverterInterface;
-use Ramsey\Uuid\Provider\TimeProviderInterface;
+use Brick\Math\BigInteger;
+use DateTimeImmutable;
+use DateTimeInterface;
+use Ramsey\Uuid\Type\Hexadecimal;
 
-use function hex2bin;
+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 TimeConverterInterface $timeConverter,
-        private TimeProviderInterface $timeProvider,
-        private RandomGeneratorInterface $randomGenerator
+        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 $clockSeq = null): string
+    public function generate($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
     {
-        // Generate 10 random bytes to append to the string returned, since our
-        // time bytes will consist of 6 bytes.
-        $random = $this->randomGenerator->generate(10);
+        if (self::$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);
+            }
 
-        $time = $this->timeProvider->getTime();
-        $unixTimeHex = $this->timeConverter->calculateTime(
-            $time->getSeconds()->toString(),
-            $time->getMicroseconds()->toString(),
-        );
+            $this->randomize($time);
+        }
 
-        return hex2bin($unixTimeHex->toString()) . $random;
+        return self::$time;
     }
 }