public function encodePacket()
{
$packetIDVarInt = VarInt::writeUnsignedVarInt($this->getPacketID());
$encodedPacket = $this->encodeContents();
$packetLengthVarInt = VarInt::writeUnsignedVarInt(strlen($encodedPacket) + $packetIDVarInt->getDataLength());
return $packetLengthVarInt->getEncoded() . $packetIDVarInt->getEncoded() . $encodedPacket;
}
/**
* Parse the raw data into the packet
* @param $data String the raw data to parse (minus packet ID and packet length
*/
public function fromRawData($data)
{
$secretLength = VarInt::readUnsignedVarInt($data);
$data = substr($data, $secretLength->getDataLength());
$secretData = substr($data, 0, $secretLength->getValue());
$data = substr($data, $secretLength->getValue());
$verifyLength = VarInt::readUnsignedVarInt($data);
$data = substr($data, $verifyLength->getDataLength());
$verifyData = substr($data, 0, $verifyLength->getValue());
$this->setToken($verifyData)->setSecret($secretData);
}
/**
* Called whenever there is data available on the stream
* @param $data String the raw data
*/
public function onData($data)
{
//if we're in encryption stage decrypt it first
if ($this->secret !== null) {
mcrypt_generic_init($this->encryptor, $this->secret, $this->secret);
$data = mdecrypt_generic($this->encryptor, $data);
mcrypt_generic_deinit($this->encryptor);
}
//attempt to parse the data as a packet
try {
//add the data to the current buffer
$this->packetBuffer .= $data;
//for as long as we have data left in the buffer
do {
//read the packet length from the stream
$packetLengthVarInt = VarInt::readUnsignedVarInt($this->packetBuffer);
//not enough data to read the packet length, wait for more data
if ($packetLengthVarInt === false) {
return;
}
//total length of the packet is the length of the varint + it's value
$totalLength = $packetLengthVarInt->getDataLength() + $packetLengthVarInt->getValue();
//if we don't have enough data to read the entire packet wait for more data to enter
$bufferLength = strlen($this->packetBuffer);
if ($bufferLength < $totalLength) {
return;
}
//remove the packet length varint from the buffer
$this->packetBuffer = substr($this->packetBuffer, $packetLengthVarInt->getDataLength());
//read the packet ID from the buffer
$packetDataWithPacketID = substr($this->packetBuffer, 0, $packetLengthVarInt->getValue());
//remove the rest of the packet from the buffer
$this->packetBuffer = substr($this->packetBuffer, $packetLengthVarInt->getValue());
//read the packet ID
$packetID = VarInt::readUnsignedVarInt($packetDataWithPacketID);
//get the raw packet data
$packetData = substr($packetDataWithPacketID, $packetID->getDataLength());
$this->lastPacket = $this->currentTime();
//trigger packet processing
$this->processPacket($packetID->getValue(), $packetData);
//if we have buffer left run again
} while (strlen($this->packetBuffer) > 0);
//if any exceptions are thrown (error parsing the packets e.t.c.) send a disconnect packet
} catch (Exception $ex) {
echo "EXCEPTION IN PACKET PARSING {$ex->getMessage()}\n";
echo $ex->getTraceAsString();
$dis = new DisconnectPacket();
$dis->setReason('Internal Server Error: ' . $ex->getMessage());
$this->end($dis->encodePacket());
}
}
/**
* Get the encoded contents of the packet (minus packetID/length)
* @return String
*/
protected function encodeContents()
{
$serverIDEncoded = StringType::write($this->serverID);
$encodedPublicKey = base64_decode($this->getPublicKey());
$publicKeyLength = VarInt::writeUnsignedVarInt(strlen($encodedPublicKey));
$encodedToken = $this->getToken();
$tokenLength = VarInt::writeUnsignedVarInt(strlen($encodedToken));
return $serverIDEncoded->getEncoded() . $publicKeyLength->getEncoded() . $encodedPublicKey . $tokenLength->getEncoded() . $encodedToken;
}
/**
* Parse the raw data
* @param $data String the raw data to parse (minus packet ID and packet length
* @throws InvalidDataException
*/
function fromRawData($data)
{
$versionVarInt = VarInt::readUnsignedVarInt($data);
$data = substr($data, $versionVarInt->getDataLength());
$addressStringLength = VarInt::readUnsignedVarInt($data);
$data = substr($data, $addressStringLength->getDataLength());
$address = substr($data, 0, $addressStringLength->getValue());
$data = substr($data, $addressStringLength->getValue());
$portShort = unpack('nshort', substr($data, 0, 2))['short'];
$data = substr($data, 2);
$nextVarInt = VarInt::readUnsignedVarInt($data);
try {
$nextStage = Stage::get($nextVarInt->getValue());
//disconnect if not a valid stage
if ($nextStage != Stage::LOGIN() && $nextStage != Stage::STATUS()) {
throw new InvalidDataException('Stage must be LOGIN or STATUS on handshake');
}
//set all of the data
$this->setNextStage($nextStage)->setServerPort($portShort)->setProtocolVersion($versionVarInt->getValue())->setServerAddress($address);
} catch (InvalidArgumentException $ex) {
throw new InvalidDataException('Stage is not a valid number');
}
}
