symfony · fabpot · Mar 14, 2020 · Mar 6, 2020
diff --git a/src/Symfony/Component/Uid/CHANGELOG.md b/src/Symfony/Component/Uid/CHANGELOG.md
@@ -5,4 +5,5 @@ CHANGELOG
 -----
 
  * added support for UUID
+ * added support for ULID
  * added the component
diff --git a/src/Symfony/Component/Uid/Tests/UlidTest.php b/src/Symfony/Component/Uid/Tests/UlidTest.php
@@ -0,0 +1,98 @@
+<?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\Tests\Component\Uid;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Uid\Ulid;
+
+class UlidTest extends TestCase
+{
+    /**
+     * @group time-sensitive
+     */
+    public function testGenerate()
+    {
+        $a = new Ulid();
+        $b = new Ulid();
+
+        $this->assertSame(0, strncmp($a, $b, 20));
+        $a = base_convert(strtr(substr($a, -6), 'ABCDEFGHJKMNPQRSTVWXYZ', 'abcdefghijklmnopqrstuv'), 32, 10);
+        $b = base_convert(strtr(substr($b, -6), 'ABCDEFGHJKMNPQRSTVWXYZ', 'abcdefghijklmnopqrstuv'), 32, 10);
+        $this->assertSame(1, $b - $a);
+    }
+
+    public function testWithInvalidUlid()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Invalid ULID: "this is not a ulid".');
+
+        new Ulid('this is not a ulid');
+    }
+
+    public function testBinary()
+    {
+        $ulid = new Ulid('00000000000000000000000000');
+        $this->assertSame("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", $ulid->toBinary());
+
+        $ulid = new Ulid('3zzzzzzzzzzzzzzzzzzzzzzzzz');
+        $this->assertSame('7fffffffffffffffffffffffffffffff', bin2hex($ulid->toBinary()));
+
+        $this->assertTrue($ulid->equals(Ulid::fromBinary(hex2bin('7fffffffffffffffffffffffffffffff'))));
+    }
+
+    /**
+     * @group time-sensitive
+     */
+    public function testGetTime()
+    {
+        $time = microtime(false);
+        $ulid = new Ulid();
+        $time = substr($time, 11).substr($time, 1, 4);
+
+        $this->assertSame((float) $time, $ulid->getTime());
+    }
+
+    public function testIsValid()
+    {
+        $this->assertFalse(Ulid::isValid('not a ulid'));
+        $this->assertTrue(Ulid::isValid('00000000000000000000000000'));
+    }
+
+    public function testEquals()
+    {
+        $a = new Ulid();
+        $b = new Ulid();
+
+        $this->assertTrue($a->equals($a));
+        $this->assertFalse($a->equals($b));
+        $this->assertFalse($a->equals((string) $a));
+    }
+
+    /**
+     * @group time-sensitive
+     */
+    public function testCompare()
+    {
+        $a = new Ulid();
+        $b = new Ulid();
+
+        $this->assertSame(0, $a->compare($a));
+        $this->assertLessThan(0, $a->compare($b));
+        $this->assertGreaterThan(0, $b->compare($a));
+
+        usleep(1001);
+        $c = new Ulid();
+
+        $this->assertLessThan(0, $b->compare($c));
+        $this->assertGreaterThan(0, $c->compare($b));
+    }
+}
diff --git a/src/Symfony/Component/Uid/Ulid.php b/src/Symfony/Component/Uid/Ulid.php
@@ -0,0 +1,182 @@
+<?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;
+
+/**
+ * @see https://github.com/ulid/spec
+ *
+ * @experimental in 5.1
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class Ulid implements \JsonSerializable
+{
+    private static $time = -1;
+    private static $rand = [];
+
+    private $ulid;
+
+    public function __construct(string $ulid = null)
+    {
+        if (null === $ulid) {
+            $this->ulid = self::generate();
+
+            return;
+        }
+
+        if (!self::isValid($ulid)) {
+            throw new \InvalidArgumentException(sprintf('Invalid ULID: "%s".', $ulid));
+        }
+
+        $this->ulid = strtr($ulid, 'abcdefghjkmnpqrstvwxyz', 'ABCDEFGHJKMNPQRSTVWXYZ');
+    }
+
+    public static function isValid(string $ulid): bool
+    {
+        if (26 !== \strlen($ulid)) {
+            return false;
+        }
+
+        if (26 !== strspn($ulid, '0123456789ABCDEFGHJKMNPQRSTVWXYZabcdefghjkmnpqrstvwxyz')) {
+            return false;
+        }
+
+        return $ulid[0] <= '7';
+    }
+
+    public static function fromBinary(string $ulid): self
+    {
+        if (16 !== \strlen($ulid)) {
+            throw new \InvalidArgumentException('Invalid binary ULID.');
+        }
+
+        $ulid = bin2hex($ulid);
+        $ulid = sprintf('%02s%04s%04s%04s%04s%04s%04s',
+            base_convert(substr($ulid, 0, 2), 16, 32),
+            base_convert(substr($ulid, 2, 5), 16, 32),
+            base_convert(substr($ulid, 7, 5), 16, 32),
+            base_convert(substr($ulid, 12, 5), 16, 32),
+            base_convert(substr($ulid, 17, 5), 16, 32),
+            base_convert(substr($ulid, 22, 5), 16, 32),
+            base_convert(substr($ulid, 27, 5), 16, 32)
+        );
+
+        return new self(strtr($ulid, 'abcdefghijklmnopqrstuv', 'ABCDEFGHJKMNPQRSTVWXYZ'));
+    }
+
+    public function toBinary()
+    {
+        $ulid = strtr($this->ulid, 'ABCDEFGHJKMNPQRSTVWXYZ', 'abcdefghijklmnopqrstuv');
+
+        $ulid = sprintf('%02s%05s%05s%05s%05s%05s%05s',
+            base_convert(substr($ulid, 0, 2), 32, 16),
+            base_convert(substr($ulid, 2, 4), 32, 16),
+            base_convert(substr($ulid, 6, 4), 32, 16),
+            base_convert(substr($ulid, 10, 4), 32, 16),
+            base_convert(substr($ulid, 14, 4), 32, 16),
+            base_convert(substr($ulid, 18, 4), 32, 16),
+            base_convert(substr($ulid, 22, 4), 32, 16)
+        );
+
+        return hex2bin($ulid);
+    }
+
+    /**
+     * Returns whether the argument is of class Ulid and contains the same value as the current instance.
+     */
+    public function equals($other): bool
+    {
+        if (!$other instanceof self) {
+            return false;
+        }
+
+        return $this->ulid === $other->ulid;
+    }
+
+    public function compare(self $other): int
+    {
+        return $this->ulid <=> $other->ulid;
+    }
+
+    public function getTime(): float
+    {
+        $time = strtr(substr($this->ulid, 0, 10), 'ABCDEFGHJKMNPQRSTVWXYZ', 'abcdefghijklmnopqrstuv');
+
+        if (\PHP_INT_SIZE >= 8) {
+            return hexdec(base_convert($time, 32, 16)) / 1000;
+        }
+
+        $time = sprintf('%02s%05s%05s',
+            base_convert(substr($time, 0, 2), 32, 16),
+            base_convert(substr($time, 2, 4), 32, 16),
+            base_convert(substr($time, 6, 4), 32, 16)
+        );
+
+        return InternalUtil::toDecimal(hex2bin($time)) / 1000;
+    }
+
+    public function __toString(): string
+    {
+        return $this->ulid;
+    }
+
+    public function jsonSerialize(): string
+    {
+        return $this->ulid;
+    }
+
+    private static function generate(): string
+    {
+        $time = microtime(false);
+        $time = substr($time, 11).substr($time, 2, 3);
+
+        if ($time !== self::$time) {
+            $r = unpack('nr1/nr2/nr3/nr4/nr', random_bytes(10));
+            $r['r1'] |= ($r['r'] <<= 4) & 0xF0000;
+            $r['r2'] |= ($r['r'] <<= 4) & 0xF0000;
+            $r['r3'] |= ($r['r'] <<= 4) & 0xF0000;
+            $r['r4'] |= ($r['r'] <<= 4) & 0xF0000;
+            unset($r['r']);
+            self::$rand = array_values($r);
+            self::$time = $time;
+        } elseif ([0xFFFFF, 0xFFFFF, 0xFFFFF, 0xFFFFF] === self::$rand) {
+            usleep(100);
+
+            return self::generate();
+        } else {
+            for ($i = 3; $i >= 0 && 0xFFFFF === self::$rand[$i]; --$i) {
+                self::$rand[$i] = 0;
+            }
+
+            ++self::$rand[$i];
+        }
+
+        if (\PHP_INT_SIZE >= 8) {
+            $time = base_convert($time, 10, 32);
+        } else {
+            $time = bin2hex(InternalUtil::toBinary($time));
+            $time = sprintf('%s%04s%04s',
+                base_convert(substr($time, 0, 2), 16, 32),
+                base_convert(substr($time, 2, 5), 16, 32),
+                base_convert(substr($time, 7, 5), 16, 32)
+            );
+        }
+
+        return strtr(sprintf('%010s%04s%04s%04s%04s',
+            $time,
+            base_convert(self::$rand[0], 10, 32),
+            base_convert(self::$rand[1], 10, 32),
+            base_convert(self::$rand[2], 10, 32),
+            base_convert(self::$rand[3], 10, 32)
+        ), 'abcdefghijklmnopqrstuv', 'ABCDEFGHJKMNPQRSTVWXYZ');
+    }
+}
diff --git a/src/Symfony/Component/Uid/composer.json b/src/Symfony/Component/Uid/composer.json
@@ -10,6 +10,10 @@
             "name": "Grégoire Pineau",
             "email": "lyrixx@lyrixx.info"
         },
+        {
+            "name": "Nicolas Grekas",
+            "email": "p@tchwork.com"
+        },
         {
             "name": "Symfony Community",
             "homepage": "https://symfony.com/contributors"