/**
* Remove the clientID from topic subscription, if not previously subscribed, doesn't reply any
* error
*/
public void processUnsubscribe(ServerChannel session, UnsubscribeMessage msg) {
List<String> topics = msg.topicFilters();
int messageID = msg.getMessageID();
String clientID = (String) session.getAttribute(NettyChannel.ATTR_KEY_CLIENTID);
LOG.debug("UNSUBSCRIBE subscription on topics {} for clientID <{}>", topics, clientID);
ClientSession clientSession = m_sessionsStore.sessionForClient(clientID);
verifyToActivate(clientID, clientSession);
for (String topic : topics) {
boolean validTopic = SubscriptionsStore.validate(topic);
if (!validTopic) {
// close the connection, not valid topicFilter is a protocol violation
session.close(true);
LOG.warn(
"UNSUBSCRIBE found an invalid topic filter <{}> for clientID <{}>", topic, clientID);
return;
}
subscriptions.removeSubscription(topic, clientID);
clientSession.unsubscribeFrom(topic);
m_interceptor.notifyTopicUnsubscribed(topic, clientID);
}
// ack the client
UnsubAckMessage ackMessage = new UnsubAckMessage();
ackMessage.setMessageID(messageID);
LOG.info("replying with UnsubAck to MSG ID {}", messageID);
session.write(ackMessage);
}
public void processDisconnect(ServerChannel session) throws InterruptedException {
String clientID = (String) session.getAttribute(NettyChannel.ATTR_KEY_CLIENTID);
boolean cleanSession = (Boolean) session.getAttribute(NettyChannel.ATTR_KEY_CLEANSESSION);
LOG.info("DISCONNECT client <{}> with clean session {}", clientID, cleanSession);
ClientSession clientSession = m_sessionsStore.sessionForClient(clientID);
clientSession.disconnect();
m_clientIDs.remove(clientID);
session.close(true);
// cleanup the will store
m_willStore.remove(clientID);
m_interceptor.notifyClientDisconnected(clientID);
LOG.info("DISCONNECT client <{}> finished", clientID, cleanSession);
}
private void failedCredentials(ServerChannel session) {
ConnAckMessage okResp = new ConnAckMessage();
okResp.setReturnCode(ConnAckMessage.BAD_USERNAME_OR_PASSWORD);
session.write(okResp);
session.close(false);
}
public void processConnect(ServerChannel session, ConnectMessage msg) {
LOG.debug("CONNECT for client <{}>", msg.getClientID());
if (msg.getProtocolVersion() != VERSION_3_1 && msg.getProtocolVersion() != VERSION_3_1_1) {
ConnAckMessage badProto = new ConnAckMessage();
badProto.setReturnCode(ConnAckMessage.UNNACEPTABLE_PROTOCOL_VERSION);
LOG.warn("processConnect sent bad proto ConnAck");
session.write(badProto);
session.close(false);
return;
}
if (msg.getClientID() == null || msg.getClientID().length() == 0) {
ConnAckMessage okResp = new ConnAckMessage();
okResp.setReturnCode(ConnAckMessage.IDENTIFIER_REJECTED);
session.write(okResp);
m_interceptor.notifyClientConnected(msg);
return;
}
// handle user authentication
if (msg.isUserFlag()) {
byte[] pwd = null;
if (msg.isPasswordFlag()) {
pwd = msg.getPassword();
} else if (!this.allowAnonymous) {
failedCredentials(session);
return;
}
if (!m_authenticator.checkValid(msg.getUsername(), pwd)) {
failedCredentials(session);
return;
}
session.setAttribute(NettyChannel.ATTR_KEY_USERNAME, msg.getUsername());
} else if (!this.allowAnonymous) {
failedCredentials(session);
return;
}
// if an old client with the same ID already exists close its session.
if (m_clientIDs.containsKey(msg.getClientID())) {
LOG.info(
"Found an existing connection with same client ID <{}>, forcing to close",
msg.getClientID());
// clean the subscriptions if the old used a cleanSession = true
ServerChannel oldSession = m_clientIDs.get(msg.getClientID()).session;
ClientSession oldClientSession = m_sessionsStore.sessionForClient(msg.getClientID());
oldClientSession.disconnect();
oldSession.setAttribute(NettyChannel.ATTR_KEY_SESSION_STOLEN, true);
oldSession.close(false);
LOG.debug("Existing connection with same client ID <{}>, forced to close", msg.getClientID());
}
ConnectionDescriptor connDescr =
new ConnectionDescriptor(msg.getClientID(), session, msg.isCleanSession());
m_clientIDs.put(msg.getClientID(), connDescr);
int keepAlive = msg.getKeepAlive();
LOG.debug("Connect with keepAlive {} s", keepAlive);
session.setAttribute(NettyChannel.ATTR_KEY_KEEPALIVE, keepAlive);
session.setAttribute(NettyChannel.ATTR_KEY_CLEANSESSION, msg.isCleanSession());
// used to track the client in the subscription and publishing phases.
session.setAttribute(NettyChannel.ATTR_KEY_CLIENTID, msg.getClientID());
LOG.debug("Connect create session <{}>", session);
session.setIdleTime(Math.round(keepAlive * 1.5f));
// Handle will flag
if (msg.isWillFlag()) {
AbstractMessage.QOSType willQos = AbstractMessage.QOSType.valueOf(msg.getWillQos());
byte[] willPayload = msg.getWillMessage();
ByteBuffer bb = (ByteBuffer) ByteBuffer.allocate(willPayload.length).put(willPayload).flip();
// save the will testament in the clientID store
WillMessage will = new WillMessage(msg.getWillTopic(), bb, msg.isWillRetain(), willQos);
m_willStore.put(msg.getClientID(), will);
}
ConnAckMessage okResp = new ConnAckMessage();
okResp.setReturnCode(ConnAckMessage.CONNECTION_ACCEPTED);
ClientSession clientSession = m_sessionsStore.sessionForClient(msg.getClientID());
boolean isSessionAlreadyStored = clientSession != null;
if (!msg.isCleanSession() && isSessionAlreadyStored) {
okResp.setSessionPresent(true);
}
session.write(okResp);
m_interceptor.notifyClientConnected(msg);
if (!isSessionAlreadyStored) {
LOG.info("Create persistent session for clientID <{}>", msg.getClientID());
clientSession = m_sessionsStore.createNewSession(msg.getClientID(), msg.isCleanSession());
}
clientSession.activate();
if (msg.isCleanSession()) {
clientSession.cleanSession();
}
LOG.info(
"Connected client ID <{}> with clean session {}", msg.getClientID(), msg.isCleanSession());
if (!msg.isCleanSession()) {
// force the republish of stored QoS1 and QoS2
republishStoredInSession(clientSession);
}
LOG.info("CONNECT processed");
}