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<?php |
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namespace Domain\Identity; |
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/** |
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* @author Sebastiaan Hilbers <[email protected]> |
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*/ |
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abstract class UuidIdentity implements Identity, Generator |
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{ |
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/** |
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* @var string |
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*/ |
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private $uuid; |
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private function __construct($uuid) |
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{ |
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$this->uuid = $uuid; |
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} |
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/** |
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* Generates a UUID v4 Identity |
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* @return static |
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*/ |
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public static function generate() |
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{ |
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return new static(self::uuid4()); |
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} |
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/** |
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* Creates an identifier object from a string representation |
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* @param $string |
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* @return static |
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*/ |
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public static function fromString($string) |
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{ |
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self::guardUuid($string); |
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return new static($string); |
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} |
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/** |
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* Returns a string that can be parsed by fromString() |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return (string) $this->uuid; |
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} |
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/** |
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* Compares the object to another IdentifiesAggregate object. Returns true if both have the same type and value. |
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* @param Identity $other |
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* @return boolean |
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*/ |
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public function equals(Identity $other) |
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{ |
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return $other instanceof static && $this->uuid == $other->uuid; |
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} |
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/** |
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* Returns a version 4 UUID |
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* @return string |
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*/ |
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private static function uuid4() |
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{ |
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$bytes = function_exists('openssl_random_pseudo_bytes') |
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? openssl_random_pseudo_bytes(16) |
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: self::generateBytes(16) |
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; |
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$hash = bin2hex($bytes); |
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// Set the version number |
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$timeHi = hexdec(substr($hash, 12, 4)) & 0x0fff; |
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$timeHi &= ~(0xf000); |
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$timeHi |= 4 << 12; |
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// Set the variant to RFC 4122 |
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$clockSeqHi = hexdec(substr($hash, 16, 2)) & 0x3f; |
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$clockSeqHi &= ~(0xc0); |
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$clockSeqHi |= 0x80; |
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$fields = [ |
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'time_low' => substr($hash, 0, 8), |
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'time_mid' => substr($hash, 8, 4), |
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'time_hi_and_version' => sprintf('%04x', $timeHi), |
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'clock_seq_hi_and_reserved' => sprintf('%02x', $clockSeqHi), |
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'clock_seq_low' => substr($hash, 18, 2), |
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'node' => substr($hash, 20, 12), |
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]; |
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return vsprintf( |
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'%08s-%04s-%04s-%02s%02s-%012s', |
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$fields |
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); |
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} |
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private static function generateBytes($length) |
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{ |
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$bytes = ''; |
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foreach (range(1, $length) as $i) { |
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$bytes = chr(mt_rand(0, 256)) . $bytes; |
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} |
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return $bytes; |
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} |
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private static function guardUuid($string) |
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{ |
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$pattern = '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i'; |
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if (!preg_match($pattern, $string)) { |
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throw new \InvalidArgumentException("UUID of the form nnnnnnnn-nnnn-nnnn-nnnn-nnnnnnnnnnnn expected"); |
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} |
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} |
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} |
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bashilbers /
domain
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