/**
* @param string|null $input
* @return \Tmv\WhatsApi\Message\Node\NodeInterface|null
* @throws \Tmv\WhatsApi\Exception\IncompleteMessageException
* @throws \Tmv\WhatsApi\Exception\RuntimeException
*/
public function nextTree($input = null)
{
if ($input != null) {
$this->input = $input;
}
$stanzaFlag = ($this->peekInt8() & 0xf0) >> 4;
$stanzaSize = $this->peekInt16(1);
if ($stanzaSize > strlen($this->input)) {
$exception = new IncompleteMessageException("Incomplete message");
$exception->setInput($this->input);
throw $exception;
}
$this->readInt24();
if ($stanzaFlag & 8) {
if (!isset($this->key)) {
throw new RuntimeException("Encountered encrypted message, missing key");
}
$realSize = $stanzaSize - 4;
$this->input = $this->key->decodeMessage($this->input, $realSize, 0, $realSize);
}
if ($stanzaSize > 0) {
return $this->nextTreeInternal();
}
return null;
}
/**
* Authenticate with the Whatsapp Server.
*
* @param Connection $connection
* @param Identity $identity
* @param string $challengeData
* @return string Returns binary string
*/
protected function getAuthData(Connection $connection, Identity $identity, $challengeData)
{
$keys = KeyStream::generateKeys(base64_decode($identity->getPassword()), $challengeData);
$connection->setInputKey($this->createKeyStream($keys[2], $keys[3]));
$connection->setOutputKey($this->createKeyStream($keys[0], $keys[1]));
$array = "" . $identity->getPhone()->getPhoneNumber() . $challengeData;
$response = $connection->getOutputKey()->encodeMessage($array, 0, 4, strlen($array) - 4);
return $response;
}
protected function flushBuffer($encrypt = true)
{
$size = strlen($this->output);
$data = $this->output;
if ($this->key != null && $encrypt) {
$bsize = $this->getInt24($size);
//encrypt
$data = $this->key->encodeMessage($data, $size, 0, $size);
$len = strlen($data);
$bsize[0] = chr(8 << 4 | ($len & 16711680) >> 16);
$bsize[1] = chr(($len & 65280) >> 8);
$bsize[2] = chr($len & 255);
$size = $this->parseInt24($bsize);
}
$ret = $this->writeInt24($size) . $data;
$this->output = '';
return $ret;
}
