ConsoleReaderChildProcessUtils.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\console;
 
use function hash;
use function strlen;
use function strrpos;
use function substr;
 
final class ConsoleReaderChildProcessUtils{
    public const TOKEN_DELIMITER = ":";
    public const TOKEN_HASH_ALGO = "xxh3";
 
    private function __construct(){
 
    }
 
    public static function createMessage(string $line, int &$counter) : string{
        $token = hash(self::TOKEN_HASH_ALGO, $line, options: ['seed' => $counter]);
        $counter++;
        return $line . self::TOKEN_DELIMITER . $token;
    }
 
    public static function parseMessage(string $message, int &$counter) : ?string{
        $delimiterPos = strrpos($message, self::TOKEN_DELIMITER);
        if($delimiterPos !== false){
            $left = substr($message, 0, $delimiterPos);
            $right = substr($message, $delimiterPos + strlen(self::TOKEN_DELIMITER));
            $expectedToken = hash(self::TOKEN_HASH_ALGO, $left, options: ['seed' => $counter]);
 
            if($expectedToken === $right){
                $counter++;
                return $left;
            }
        }
 
        return null;
    }
}