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96 lines
2.8 KiB
96 lines
2.8 KiB
1 year ago
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<?php declare(strict_types = 0);
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* Class to work with CUID hash. Based on server CUID implementation.
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*/
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class CCuid {
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private const BASE36 = 36;
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private const BLOCK_SIZE = 4;
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private const DECIMAL = 10;
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private const PREFIX = 'c';
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private const DISCRETE_VALUES = 1679616;
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public const LENGTH = 25;
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private static $counter = -1;
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public static function generate(): string {
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return sprintf('%s%s%s%s%s%s', self::PREFIX, self::getTimestampBlock(), self::getCounterBlock(),
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self::getFingerprintBlock(), self::getRandomBlock(), self::getRandomBlock()
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);
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}
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public static function isCuid(string $hash): bool {
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return $hash[0] === self::PREFIX;
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}
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public static function checkLength(string $hash): bool {
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return strlen($hash) === self::LENGTH;
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}
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private static function pad(string $value, int $size): string {
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return substr(str_pad(base_convert($value, self::DECIMAL, self::BASE36), $size, '0', STR_PAD_LEFT), -$size);
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}
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private static function next(): int {
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self::$counter++;
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if (self::$counter >= self::DISCRETE_VALUES) {
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self::$counter = 0;
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}
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return self::$counter;
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}
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private static function getRandomBlock(): string {
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$rand = floor(mt_rand() / mt_getrandmax() * self::DISCRETE_VALUES);
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return self::pad((string) $rand, self::BLOCK_SIZE);
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}
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private static function getCounterBlock(): string {
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return self::pad((string) self::next(), self::BLOCK_SIZE);
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}
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private static function getTimestampBlock(): string {
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return self::pad((string) floor(microtime(true) * 1000), self::BLOCK_SIZE * 2);
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}
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private static function getHostnameSubBlock(): string {
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$sum = strlen(gethostname()) + self::BASE36;
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foreach (str_split(gethostname()) as $char) {
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$sum += ord($char);
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}
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return self::pad((string) $sum, self::BLOCK_SIZE / 2);
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}
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private static function getPidSubBlock(): string {
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return self::pad((string) getmypid(), self::BLOCK_SIZE / 2);
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}
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private static function getFingerprintBlock(): string {
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return self::getPidSubBlock().self::getHostnameSubBlock();
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}
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}
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