LoginPacket.php

<?php
 
/*
 * This file is part of BedrockProtocol.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
 *
 * BedrockProtocol 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.
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe\protocol;
 
use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
use pocketmine\utils\BinaryStream;
use function strlen;
 
class LoginPacket extends DataPacket implements ServerboundPacket{
    public const NETWORK_ID = ProtocolInfo::LOGIN_PACKET;
 
    public int $protocol;
    public string $authInfoJson;
    public string $clientDataJwt;
 
    public static function create(int $protocol, string $authInfoJson, string $clientDataJwt) : self{
        $result = new self;
        $result->protocol = $protocol;
        $result->authInfoJson = $authInfoJson;
        $result->clientDataJwt = $clientDataJwt;
        return $result;
    }
 
    public function canBeSentBeforeLogin() : bool{
        return true;
    }
 
    protected function decodePayload(PacketSerializer $in) : void{
        $this->protocol = $in->getInt();
        $this->decodeConnectionRequest($in->getString());
    }
 
    protected function decodeConnectionRequest(string $binary) : void{
        $connRequestReader = new BinaryStream($binary);
 
        $authInfoJsonLength = $connRequestReader->getLInt();
        if($authInfoJsonLength <= 0){
            //technically this is always positive; the problem results because getLInt() is implicitly signed
            //this is inconsistent with many other methods, but we can't do anything about that for now
            throw new PacketDecodeException("Length of auth info JSON must be positive");
        }
        $this->authInfoJson = $connRequestReader->get($authInfoJsonLength);
 
        $clientDataJwtLength = $connRequestReader->getLInt();
        if($clientDataJwtLength <= 0){
            //technically this is always positive; the problem results because getLInt() is implicitly signed
            //this is inconsistent with many other methods, but we can't do anything about that for now
            throw new PacketDecodeException("Length of clientData JWT must be positive");
        }
        $this->clientDataJwt = $connRequestReader->get($clientDataJwtLength);
    }
 
    protected function encodePayload(PacketSerializer $out) : void{
        $out->putInt($this->protocol);
        $out->putString($this->encodeConnectionRequest());
    }
 
    protected function encodeConnectionRequest() : string{
        $connRequestWriter = new BinaryStream();
 
        $connRequestWriter->putLInt(strlen($this->authInfoJson));
        $connRequestWriter->put($this->authInfoJson);
 
        $connRequestWriter->putLInt(strlen($this->clientDataJwt));
        $connRequestWriter->put($this->clientDataJwt);
 
        return $connRequestWriter->getBuffer();
    }
 
    public function handle(PacketHandlerInterface $handler) : bool{
        return $handler->handleLogin($this);
    }
}