/**
* Does the magic handshake to begin the connection
*
* @param string $buffer Buffer sent by the client
* @return bool Was the handshake successful
* @throws Exception If something goes wrong
*/
public function performHandshake($buffer)
{
if ($this->state != self::STATE_CONNECTING) {
throw new Exception('Unable to perform handshake, client is not in connecting state');
}
$this->headers = $headers = $this->parseRequestHeader($buffer);
$key = $headers['Sec-WebSocket-Key'];
$hash = base64_encode(sha1($key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
$headers = array('HTTP/1.1 101 Switching Protocols', 'Upgrade: websocket', 'Connection: Upgrade', 'Sec-WebSocket-Accept: ' . $hash);
$headers = implode("\r\n", $headers) . "\r\n\r\n";
$left = strlen($headers);
do {
$sent = @socket_send($this->socket, $headers, $left, 0);
if ($sent === false) {
$error = $this->server->getLastError();
throw new Exception('Sending handshake failed: : ' . $error->message . ' [' . $error->code . ']');
}
$left -= $sent;
if ($sent > 0) {
$headers = substr($headers, $sent);
}
} while ($left > 0);
$this->state = self::STATE_OPEN;
}
