Added the UUID extension to Core and deprecated the global uuid call …

…with an uuid3 to specify version (FakerPHP#427)

src/Faker/Core/Uuid.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Faker\Core;
+
+use Faker\Extension\UuidExtension;
+
+final class Uuid implements UuidExtension
+{
+    public function uuid3(): string
+    {
+        $number = new Number();
+
+        // fix for compatibility with 32bit architecture; each mt_rand call is restricted to 32bit
+        // two such calls will cause 64bits of randomness regardless of architecture
+        $seed = $number->numberBetween(0, 2147483647) . '#' . $number->numberBetween(0, 2147483647);
+
+        // Hash the seed and convert to a byte array
+        $val = md5($seed, true);
+        $byte = array_values(unpack('C16', $val));
+
+        // extract fields from byte array
+        $tLo = ($byte[0] << 24) | ($byte[1] << 16) | ($byte[2] << 8) | $byte[3];
+        $tMi = ($byte[4] << 8) | $byte[5];
+        $tHi = ($byte[6] << 8) | $byte[7];
+        $csLo = $byte[9];
+        $csHi = $byte[8] & 0x3f | (1 << 7);
+
+        // correct byte order for big edian architecture
+        if (pack('L', 0x6162797A) == pack('N', 0x6162797A)) {
+            $tLo = (($tLo & 0x000000ff) << 24) | (($tLo & 0x0000ff00) << 8)
+                | (($tLo & 0x00ff0000) >> 8) | (($tLo & 0xff000000) >> 24);
+            $tMi = (($tMi & 0x00ff) << 8) | (($tMi & 0xff00) >> 8);
+            $tHi = (($tHi & 0x00ff) << 8) | (($tHi & 0xff00) >> 8);
+        }
+
+        // apply version number
+        $tHi &= 0x0fff;
+        $tHi |= (3 << 12);
+
+        // cast to string
+        return sprintf(
+            '%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x',
+            $tLo,
+            $tMi,
+            $tHi,
+            $csHi,
+            $csLo,
+            $byte[10],
+            $byte[11],
+            $byte[12],
+            $byte[13],
+            $byte[14],
+            $byte[15]
+        );
+    }
+}

src/Faker/Extension/ContainerBuilder.php

@@ -66,6 +66,7 @@ public static function defaultExtensions(): array
             FileExtension::class => Core\File::class,
             NumberExtension::class => Core\Number::class,
             VersionExtension::class => Core\Version::class,
+            UuidExtension::class => Core\Uuid::class,
         ];
     }
 

src/Faker/Extension/UuidExtension.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Faker\Extension;
+
+/**
+ * @experimental This interface is experimental and does not fall under our BC promise
+ */
+interface UuidExtension extends Extension
+{
+    /**
+     * Generate name based md5 UUID (version 3).
+     *
+     * @example '7e57d004-2b97-0e7a-b45f-5387367791cd'
+     */
+    public function uuid3(): string;
+}

src/Faker/Generator.php

@@ -797,6 +797,34 @@ public function bloodGroup(): string
         return $this->ext(Extension\BloodExtension::class)->bloodGroup();
     }
 
+    /**
+     * Get a random v3 uuid
+     *
+     * @example '7e57d004-2b97-0e7a-b45f-5387367791cd'
+     *
+     * @deprecated call uuid3() instead
+     */
+    public function uuid(): string
+    {
+        trigger_deprecation(
+            'fakerphp/faker',
+            '1.18',
+            'Method uuid() is deprecated, call uuid3() instead'
+        );
+
+        return $this->uuid3();
+    }
+
+    /**
+     * Get a random v3 uuid
+     *
+     * @example '7e57d004-2b97-0e7a-b45f-5387367791cd'
+     */
+    public function uuid3(): string
+    {
+        return $this->ext(Extension\UuidExtension::class)->uuid3();
+    }
+
     /**
      * Get a random EAN13 barcode.
      *

test/Faker/Core/UuidTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Faker\Test\Core;
+
+use Faker\Test\TestCase;
+
+final class UuidTest extends TestCase
+{
+    public function testUuidReturnsUuid()
+    {
+        $uuid = $this->faker->uuid3();
+        self::assertTrue($this->isUuid($uuid));
+    }
+
+    public function testUuidExpectedSeed()
+    {
+        if (pack('L', 0x6162797A) == pack('N', 0x6162797A)) {
+            self::markTestSkipped('Big Endian');
+        }
+        $this->faker->seed(123);
+        self::assertEquals('8e2e0c84-50dd-367c-9e66-f3ab455c78d6', $this->faker->uuid3());
+        self::assertEquals('073eb60a-902c-30ab-93d0-a94db371f6c8', $this->faker->uuid3());
+    }
+
+    protected function isUuid($uuid)
+    {
+        return is_string($uuid) && (bool) preg_match('/^[a-f0-9]{8,8}-(?:[a-f0-9]{4,4}-){3,3}[a-f0-9]{12,12}$/i', $uuid);
+    }
+}