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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace LambdaTwelve\OneRecord\Model; |
| 6 | |
| 7 | use InvalidArgumentException; |
| 8 | |
| 9 | /** |
| 10 | * The two UUID flavours the package needs: version 5 (name-based, so the same |
| 11 | * input always yields the same id) and version 4 (random, from an injectable |
| 12 | * byte source so tests stay deterministic). |
| 13 | */ |
| 14 | final class Uuid |
| 15 | { |
| 16 | /** RFC 4122 namespace for URLs; our names are IRIs. */ |
| 17 | public const string NAMESPACE_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8'; |
| 18 | |
| 19 | private function __construct() {} |
| 20 | |
| 21 | public static function v5(string $namespace, string $name): string |
| 22 | { |
| 23 | $hash = sha1(self::bytes($namespace) . $name); |
| 24 | |
| 25 | return self::format(substr($hash, 0, 32), 5); |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * @param callable(int): string $randomBytes |
| 30 | */ |
| 31 | public static function v4(callable $randomBytes): string |
| 32 | { |
| 33 | return self::format(bin2hex($randomBytes(16)), 4); |
| 34 | } |
| 35 | |
| 36 | public static function isValid(string $value): bool |
| 37 | { |
| 38 | return preg_match('/^[0-9a-f]{8}-[0-9a-f]{4}-[1-8][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i', $value) === 1; |
| 39 | } |
| 40 | |
| 41 | private static function format(string $hex, int $version): string |
| 42 | { |
| 43 | $hex = substr($hex, 0, 12) . dechex($version) . substr($hex, 13, 3) |
| 44 | . dechex((hexdec($hex[16]) & 0x3) | 0x8) . substr($hex, 17, 15); |
| 45 | |
| 46 | return \sprintf('%s-%s-%s-%s-%s', substr($hex, 0, 8), substr($hex, 8, 4), substr($hex, 12, 4), substr($hex, 16, 4), substr($hex, 20, 12)); |
| 47 | } |
| 48 | |
| 49 | private static function bytes(string $uuid): string |
| 50 | { |
| 51 | $hex = str_replace('-', '', $uuid); |
| 52 | if (\strlen($hex) !== 32 || !ctype_xdigit($hex)) { |
| 53 | throw new InvalidArgumentException(\sprintf('Not a UUID: "%s".', $uuid)); |
| 54 | } |
| 55 | |
| 56 | return (string) hex2bin($hex); |
| 57 | } |
| 58 | } |