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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\Codec;
use InvalidArgumentException;
use Ramsey\Uuid\Builder\UuidBuilderInterface;
use Ramsey\Uuid\Exception\InvalidUuidStringException;
use Ramsey\Uuid\Uuid;
use Ramsey\Uuid\UuidInterface;
/**
* StringCodec encodes and decodes RFC 4122 UUIDs
*
* @link http://tools.ietf.org/html/rfc4122
*/
class StringCodec implements CodecInterface
{
/**
* @var UuidBuilderInterface
*/
private $builder;
/**
* Constructs a StringCodec for use encoding and decoding UUIDs
*
* @param UuidBuilderInterface $builder The UUID builder to use when encoding UUIDs
*/
public function __construct(UuidBuilderInterface $builder)
{
$this->builder = $builder;
}
/**
* Encodes a UuidInterface as a string representation of a UUID
*
* @param UuidInterface $uuid
* @return string Hexadecimal string representation of a UUID
*/
public function encode(UuidInterface $uuid)
{
$fields = array_values($uuid->getFieldsHex());
return vsprintf(
'%08s-%04s-%04s-%02s%02s-%012s',
$fields
);
}
/**
* Encodes a UuidInterface as a binary representation of a UUID
*
* @param UuidInterface $uuid
* @return string Binary string representation of a UUID
*/
public function encodeBinary(UuidInterface $uuid)
{
return hex2bin($uuid->getHex());
}
/**
* Decodes a string representation of a UUID into a UuidInterface object instance
*
* @param string $encodedUuid
* @return UuidInterface
* @throws \Ramsey\Uuid\Exception\InvalidUuidStringException
*/
public function decode($encodedUuid)
{
$components = $this->extractComponents($encodedUuid);
$fields = $this->getFields($components);
return $this->builder->build($this, $fields);
}
/**
* Decodes a binary representation of a UUID into a UuidInterface object instance
*
* @param string $bytes
* @return UuidInterface
* @throws \InvalidArgumentException if string has not 16 characters
*/
public function decodeBytes($bytes)
{
if (strlen($bytes) !== 16) {
throw new InvalidArgumentException('$bytes string should contain 16 characters.');
}
$hexUuid = unpack('H*', $bytes);
return $this->decode($hexUuid[1]);
}
/**
* Returns the UUID builder
*
* @return UuidBuilderInterface
*/
protected function getBuilder()
{
return $this->builder;
}
/**
* Returns an array of UUID components (the UUID exploded on its dashes)
*
* @param string $encodedUuid
* @return array
* @throws \Ramsey\Uuid\Exception\InvalidUuidStringException
*/
protected function extractComponents($encodedUuid)
{
$nameParsed = str_replace(array(
'urn:',
'uuid:',
'{',
'}',
'-'
), '', $encodedUuid);
// We have stripped out the dashes and are breaking up the string using
// substr(). In this way, we can accept a full hex value that doesn't
// contain dashes.
$components = array(
substr($nameParsed, 0, 8),
substr($nameParsed, 8, 4),
substr($nameParsed, 12, 4),
substr($nameParsed, 16, 4),
substr($nameParsed, 20)
);
$nameParsed = implode('-', $components);
if (!Uuid::isValid($nameParsed)) {
throw new InvalidUuidStringException('Invalid UUID string: ' . $encodedUuid);
}
return $components;
}
/**
* Returns the fields that make up this UUID
*
* @see \Ramsey\Uuid\UuidInterface::getFieldsHex()
* @param array $components
* @return array
*/
protected function getFields(array $components)
{
return array(
'time_low' => str_pad($components[0], 8, '0', STR_PAD_LEFT),
'time_mid' => str_pad($components[1], 4, '0', STR_PAD_LEFT),
'time_hi_and_version' => str_pad($components[2], 4, '0', STR_PAD_LEFT),
'clock_seq_hi_and_reserved' => str_pad(substr($components[3], 0, 2), 2, '0', STR_PAD_LEFT),
'clock_seq_low' => str_pad(substr($components[3], 2), 2, '0', STR_PAD_LEFT),
'node' => str_pad($components[4], 12, '0', STR_PAD_LEFT)
);
}
}