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<?php
/**
* This file is part of the ramsey/uuid library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
* @link https://benramsey.com/projects/ramsey-uuid/ Documentation
* @link https://packagist.org/packages/ramsey/uuid Packagist
* @link https://github.com/ramsey/uuid GitHub
*/
namespace Ramsey\Uuid\Generator;
use Exception;
use InvalidArgumentException;
use Ramsey\Uuid\Converter\NumberConverterInterface;
use Ramsey\Uuid\Exception\UnsatisfiedDependencyException;
/**
* CombGenerator provides functionality to generate COMB (combined GUID/timestamp)
* sequential UUIDs
*
* @link https://en.wikipedia.org/wiki/Globally_unique_identifier#Sequential_algorithms
*/
class CombGenerator implements RandomGeneratorInterface
{
const TIMESTAMP_BYTES = 6;
/**
* @var RandomGeneratorInterface
*/
private $randomGenerator;
/**
* @var NumberConverterInterface
*/
private $converter;
/**
* Constructs a `CombGenerator` using a random-number generator and a number converter
*
* @param RandomGeneratorInterface $generator Random-number generator for the non-time part.
* @param NumberConverterInterface $numberConverter Instance of number converter.
*/
public function __construct(RandomGeneratorInterface $generator, NumberConverterInterface $numberConverter)
{
$this->converter = $numberConverter;
$this->randomGenerator = $generator;
}
/**
* Generates a string of binary data of the specified length
*
* @param integer $length The number of bytes of random binary data to generate
* @return string A binary string
* @throws UnsatisfiedDependencyException if `Moontoast\Math\BigNumber` is not present
* @throws InvalidArgumentException if length is not a positive integer
* @throws Exception
*/
public function generate($length)
{
if ($length < self::TIMESTAMP_BYTES || $length < 0) {
throw new InvalidArgumentException('Length must be a positive integer.');
}
$hash = '';
if (self::TIMESTAMP_BYTES > 0 && $length > self::TIMESTAMP_BYTES) {
$hash = $this->randomGenerator->generate($length - self::TIMESTAMP_BYTES);
}
$lsbTime = str_pad($this->converter->toHex($this->timestamp()), self::TIMESTAMP_BYTES * 2, '0', STR_PAD_LEFT);
return hex2bin(str_pad(bin2hex($hash), $length - self::TIMESTAMP_BYTES, '0') . $lsbTime);
}
/**
* Returns current timestamp as integer, precise to 0.00001 seconds
*
* @return string
*/
private function timestamp()
{
$time = explode(' ', microtime(false));
return $time[1] . substr($time[0], 2, 5);
}
}
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