PocketMine-MP/src/network/upnp/UPnPNetworkInterface.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\network\upnp;

use pocketmine\network\NetworkInterface;
use pocketmine\utils\Internet;
use pocketmine\utils\InternetException;

final class UPnPNetworkInterface implements NetworkInterface{
	private ?string $serviceURL = null;

	public function __construct(
		private \Logger $logger,
		private string $ip,
		private int $port
	){
		if(!Internet::$online){
			throw new \RuntimeException("Server is offline");
		}

		$this->logger = new \PrefixedLogger($logger, "UPnP Port Forwarder");
	}

	public function start() : void{
		$this->logger->info("Attempting to portforward...");

		try{
			$this->serviceURL = UPnP::getServiceUrl();
			UPnP::portForward($this->serviceURL, Internet::getInternalIP(), $this->port, $this->port);
			$this->logger->info("Forwarded $this->ip:$this->port to external port $this->port");
		}catch(UPnPException | InternetException $e){
			$this->logger->error("UPnP portforward failed: " . $e->getMessage());
		}
	}

	public function setName(string $name) : void{

	}

	public function tick() : void{

	}

	public function shutdown() : void{
		if($this->serviceURL === null){
			return;
		}

		UPnP::removePortForward($this->serviceURL, $this->port);
	}
}