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<?php declare(strict_types = 0);
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* Class to work with CUID hash. Based on server CUID implementation.
*/
class CCuid {
private const BASE36 = 36;
private const BLOCK_SIZE = 4;
private const DECIMAL = 10;
private const PREFIX = 'c';
private const DISCRETE_VALUES = 1679616;
public const LENGTH = 25;
private static $counter = -1;
public static function generate(): string {
return sprintf('%s%s%s%s%s%s', self::PREFIX, self::getTimestampBlock(), self::getCounterBlock(),
self::getFingerprintBlock(), self::getRandomBlock(), self::getRandomBlock()
);
}
public static function isCuid(string $hash): bool {
return $hash[0] === self::PREFIX;
}
public static function checkLength(string $hash): bool {
return strlen($hash) === self::LENGTH;
}
private static function pad(string $value, int $size): string {
return substr(str_pad(base_convert($value, self::DECIMAL, self::BASE36), $size, '0', STR_PAD_LEFT), -$size);
}
private static function next(): int {
self::$counter++;
if (self::$counter >= self::DISCRETE_VALUES) {
self::$counter = 0;
}
return self::$counter;
}
private static function getRandomBlock(): string {
$rand = floor(mt_rand() / mt_getrandmax() * self::DISCRETE_VALUES);
return self::pad((string) $rand, self::BLOCK_SIZE);
}
private static function getCounterBlock(): string {
return self::pad((string) self::next(), self::BLOCK_SIZE);
}
private static function getTimestampBlock(): string {
return self::pad((string) floor(microtime(true) * 1000), self::BLOCK_SIZE * 2);
}
private static function getHostnameSubBlock(): string {
$sum = strlen(gethostname()) + self::BASE36;
foreach (str_split(gethostname()) as $char) {
$sum += ord($char);
}
return self::pad((string) $sum, self::BLOCK_SIZE / 2);
}
private static function getPidSubBlock(): string {
return self::pad((string) getmypid(), self::BLOCK_SIZE / 2);
}
private static function getFingerprintBlock(): string {
return self::getPidSubBlock().self::getHostnameSubBlock();
}
}
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