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Commit 3b5c3d2c authored by Evan Prodromou's avatar Evan Prodromou

UUID-generation tools

parent 3d62c1cf
<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* UUID generation
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category UUID
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
// This check helps protect against security problems;
// your code file can't be executed directly from the web.
exit(1);
}
/**
* UUID generation
*
* @category General
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class UUID
{
protected $str = null;
/**
* Constructor for a UUID
*
* Uses gen() to create a new UUID
*/
function __construct()
{
$this->str = self::gen();
}
/**
* For serializing to a string
*
* @return string version of self
*/
function __toString()
{
return $this->str;
}
/**
* For serializing to a string
*
* @return string version of self
*/
function getString()
{
return $this->str;
}
/**
* Generate a new UUID
*
* @return 36-char v4 (random-ish) UUID
*/
static function gen()
{
return sprintf('%s-%s-%04x-%04x-%s',
// 32 bits for "time_low"
common_good_rand(4),
// 16 bits for "time_mid"
common_good_rand(2),
// 16 bits for "time_hi_and_version",
// four most significant bits holds version number 4
(hexdec(common_good_rand(2)) & 0x0fff) | 0x4000,
// 16 bits, 8 bits for "clk_seq_hi_res",
// 8 bits for "clk_seq_low",
// two most significant bits holds zero and one
// for variant DCE1.1
(hexdec(common_good_rand(2)) & 0x3fff) | 0x8000,
// 48 bits for "node"
common_good_rand(6));
}
}
<?php
if (isset($_SERVER) && array_key_exists('REQUEST_METHOD', $_SERVER)) {
print "This script must be run from the command line\n";
exit();
}
define('INSTALLDIR', realpath(dirname(__FILE__) . '/..'));
define('STATUSNET', true);
require_once INSTALLDIR . '/lib/common.php';
class UUIDTest extends PHPUnit_Framework_TestCase
{
public function testGenerate()
{
$result = UUID::gen();
$this->assertRegExp('/^[0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12}$/',
$result);
// Check version number
$this->assertEquals(0x4000, hexdec(substr($result, 14, 4)) & 0xF000);
$this->assertEquals(0x8000, hexdec(substr($result, 19, 4)) & 0xC000);
}
}
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