private static String getSuccessfulNegotiation() {
return "[{\""
+ MessageParts.ToSubject.name()
+ "\":\"ClientBus\", \""
+ MessageParts.CommandType.name()
+ "\":\""
+ BusCommands.WebsocketChannelOpen.name()
+ "\"}]";
}
private static String getReverseChallenge(final String token) {
return "[{\""
+ MessageParts.ToSubject.name()
+ "\":\"ClientBus\", \""
+ MessageParts.CommandType.name()
+ "\":\""
+ BusCommands.WebsocketChannelVerify.name()
+ "\",\""
+ MessageParts.WebSocketToken
+ "\":\""
+ token
+ "\"}]";
}
private static String getFailedNegotiation(final String error) {
return "[{\""
+ MessageParts.ToSubject.name()
+ "\":\"ClientBus\", \""
+ MessageParts.CommandType.name()
+ "\":\""
+ BusCommands.WebsocketNegotiationFailed.name()
+ "\","
+ "\""
+ MessageParts.ErrorMessage.name()
+ "\":\""
+ error
+ "\"}]";
}
@Override
protected void onReceivedFrame(final WebSocket socket) throws IOException {
final Frame frame = socket.readFrame();
switch (frame.getType()) {
case Ping:
socket.writeFrame(new PongFrame());
break;
case Binary:
socket.writeFrame(TextFrame.from("Binary Frames Not Supported!"));
break;
default:
if (frame.getType() != FrameType.Text) {
return;
}
}
final String text = ((TextFrame) frame).getText();
final QueueSession session =
sessionProvider.createOrGetSession(socket.getHttpSession(), socket.getSocketID());
if (text.length() == 0) return;
@SuppressWarnings("unchecked")
final EJObject val = JSONDecoder.decode(text).isObject();
final LocalContext localSessionContext = LocalContext.get(session);
QueueSession cometSession =
localSessionContext.getAttribute(QueueSession.class, WEBSOCKET_SESSION_ALIAS);
// this is not an active channel.
if (cometSession == null) {
final String commandType = val.get(MessageParts.CommandType.name()).isString().stringValue();
// this client apparently wants to connect.
if (BusCommands.ConnectToQueue.name().equals(commandType)) {
final String sessionKey =
val.get(MessageParts.ConnectionSessionKey.name()).isString().stringValue();
// has this client already attempted a connection, and is in a wait verify state
if (sessionKey != null
&& (cometSession = service.getBus().getSessionBySessionId(sessionKey)) != null) {
final LocalContext localCometSession = LocalContext.get(cometSession);
if (localCometSession.hasAttribute(WebSocketServerHandler.SESSION_ATTR_WS_STATUS)
&& WebSocketServerHandler.WEBSOCKET_ACTIVE.equals(
localCometSession.getAttribute(
String.class, WebSocketServerHandler.SESSION_ATTR_WS_STATUS))) {
// set the session queue into direct channel mode.
service
.getBus()
.getQueue(cometSession)
.setDirectSocketChannel(new SimpleEventChannelWrapped(socket));
localSessionContext.setAttribute(WEBSOCKET_SESSION_ALIAS, cometSession);
cometSession.removeAttribute(WebSocketServerHandler.SESSION_ATTR_WS_STATUS);
return;
}
// check the activation key matches.
final EJString activationKey = val.get(MessageParts.WebSocketToken.name()).isString();
if (activationKey == null
|| !WebSocketTokenManager.verifyOneTimeToken(
cometSession, activationKey.stringValue())) {
// nope. go away!
sendMessage(
new SimpleEventChannelWrapped(socket), getFailedNegotiation("bad negotiation key"));
} else {
// the key matches. now we send the reverse challenge to prove this client is actually
// already talking to the bus over the COMET channel.
final String reverseToken = WebSocketTokenManager.getNewOneTimeToken(cometSession);
localCometSession.setAttribute(
WebSocketServerHandler.SESSION_ATTR_WS_STATUS,
WebSocketServerHandler.WEBSOCKET_AWAIT_ACTIVATION);
// send the challenge.
sendMessage(new SimpleEventChannelWrapped(socket), getReverseChallenge(reverseToken));
return;
}
sendMessage(new SimpleEventChannelWrapped(socket), getSuccessfulNegotiation());
} else {
sendMessage(
new SimpleEventChannelWrapped(socket), getFailedNegotiation("bad session id"));
}
} else {
sendMessage(new SimpleEventChannelWrapped(socket), getFailedNegotiation("bad command"));
}
} else {
// this is an active session. send the message.;
final Message msg = MessageFactory.createCommandMessage(cometSession, text);
msg.setResource(HttpServletRequest.class.getName(), socket.getServletRequest());
service.store(msg);
}
}