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Uuid.php
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Uuid.php
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<?php
/**
* Created by PhpStorm.
* User: AyGLR
* Date: 26/02/16
* Time: 19:17.
*/
namespace Hoathis\Uuuid;
final class Uuid
{
const SEP = '-';
public static $SALT = '$@1†';
/**
* @var string
*/
protected $uuid;
/** @var bool */
protected $isValid;
/**
* @var array
*/
private $_cache;
/**
* generate an empty UUID.
*/
public function __construct()
{
$this->uuid = null;
$this->_cache = null;
$this->isValid = false;
}
/**
* @return string
*/
public function __toString(): string
{
return $this->uuid;
}
/**
* import from the RFC 4122 format.
*
* @param string $uuid
* @param string $sep
*
* @return self
*/
public function fromHex(string $uuid, string $sep = self::SEP): self
{
$this->uuid = filter_var($uuid, FILTER_VALIDATE_REGEXP, [
'options' => [
'default' => null,
'regexp' => '#[0-9a-f]{8}(?:'.$sep.'[0-9a-f]{4}){4}[0-9a-f]{4}#',
],
]);
$this->uuid = str_replace($sep, null, $this->uuid);
$this->isValid = $this->_cache();
return $this;
}
/**
* export to RFC 4122 format.
*
* @param string $sep
*
* @return string
*/
public function toHex(string $sep = self::SEP): string
{
return self::expand($this->uuid, $sep);
}
/**
* import from internal B64 format.
*
* @param string $string
*
* @return self
*/
public function fromBase64(string $string): self
{
$this->uuid = null;
$replacements = [
'-' => '+',
'_' => '/',
];
$iso = str_pad($string, 4 - (strlen($string) % 4), '=');
$b64 = strtr($iso, $replacements);
$bin = base64_decode($b64);
$hex = bin2hex($bin);
if (false !== ($uuid = filter_var($hex, FILTER_VALIDATE_REGEXP, [
'options' => [
'regexp' => '#[a-z0-9]{32}#',
],
]))
) {
$this->uuid = $uuid;
}
$this->isValid = $this->_cache();
return $this;
}
/**
* export to internal B64 format.
*
* @return string
*/
public function toBase64(): string
{
$replacements = [
'+' => '-',
'/' => '_',
];
$b64 = base64_encode(hex2bin($this->uuid));
$iso = strtr($b64, $replacements);
return rtrim($iso, '=');
}
/**
* generate a new UUID.
*
* @param int $typeId [0..65535]
* @param string $bin optional binary hash
*
* @return self
*/
public function generate(int $typeId, string $bin = null): self
{
$hash = bin2hex($bin ?? openssl_random_pseudo_bytes(12));
$this->_cache = [
'timestamp' => time(),
'type' => $typeId % 0x10000,
'rand' => mt_rand(0, 0xffff),
'hash' => substr($hash, 0, 12),
'crc32' => $this->crc32() % 0x10000,
];
$this->uuid = sprintf(
'%08x%04x%04x%04x%012s',
$this->_cache['timestamp'],
$this->_cache['type'],
$this->_cache['crc32'],
$this->_cache['rand'],
$this->_cache['hash']
);
$this->isValid = true;
return $this;
}
/**
* @return bool
*/
public function isValid(): bool
{
return $this->isValid;
}
/**
* @return int
*/
public function getTimestamp(): int
{
return $this->_cache['timestamp'];
}
/**
* @return int
*/
public function getType(): int
{
return $this->_cache['type'];
}
/**
* @return int
*/
public function getCrc32(): int
{
return $this->_cache['crc32'];
}
/**
* @return int
*/
public function getRand(): int
{
return $this->_cache['rand'];
}
/**
* @return string
*/
public function getHash(): string
{
return $this->_cache['hash'];
}
/**
* crc32.
*
* @return string
*/
public function crc32(): string
{
$copy = [
$this->_cache['timestamp'],
$this->_cache['type'],
$this->_cache['rand'],
$this->_cache['hash'],
];
return (int) hash('crc32', implode(self::$SALT, $copy));
}
/**
* generate cache info.
*
* @return bool
*/
private function _cache(): bool
{
$timestamp = substr($this->uuid, 0, 8);
$type = substr($this->uuid, 8, 4);
$crc32 = substr($this->uuid, 12, 4);
$rand = substr($this->uuid, 16, 4);
$hash = substr($this->uuid, 20, 12);
$this->_cache = [
'timestamp' => (int) hexdec($timestamp),
'type' => (int) hexdec($type),
'crc32' => (int) hexdec($crc32),
'rand' => (int) hexdec($rand),
'hash' => hex2bin($hash),
];
return $crc32 === ($this->crc32() % 0x10000);
}
/**
* add '-' at correct positions in the UUID.
*
* @param string $uuid
* @param string $sep
*
* @return string
*/
protected static function expand(string $uuid, string $sep): string
{
return substr($uuid, 0, 8)
.$sep.substr($uuid, 8, 4)
.$sep.substr($uuid, 12, 4)
.$sep.substr($uuid, 16, 4)
.$sep.substr($uuid, 20, 12);
}
/**
* remove '-' from the UUID.
*
* @param string $uuid
* @param string $sep
*
* @return string
*/
protected static function collapse(string $uuid, string $sep): string
{
return strtr($uuid, $sep, null);
}
}