/**
* Copyright © 2016-2017 The Thingsboard Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.thingsboard.server.transport.mqtt;
import com.fasterxml.jackson.databind.JsonNode;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.mqtt.*;
import io.netty.handler.codec.mqtt.MqttConnectReturnCode;
import io.netty.handler.codec.mqtt.MqttQoS;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;
import org.thingsboard.server.common.data.Device;
import org.thingsboard.server.common.data.security.DeviceTokenCredentials;
import org.thingsboard.server.common.data.security.DeviceX509Credentials;
import org.thingsboard.server.common.msg.session.AdaptorToSessionActorMsg;
import org.thingsboard.server.common.msg.session.BasicToDeviceActorSessionMsg;
import org.thingsboard.server.common.msg.session.ctrl.SessionCloseMsg;
import org.thingsboard.server.common.transport.SessionMsgProcessor;
import org.thingsboard.server.common.transport.adaptor.AdaptorException;
import org.thingsboard.server.common.transport.auth.DeviceAuthService;
import org.thingsboard.server.dao.EncryptionUtil;
import org.thingsboard.server.dao.device.DeviceService;
import org.thingsboard.server.transport.mqtt.adaptors.MqttTransportAdaptor;
import org.thingsboard.server.transport.mqtt.session.GatewaySessionCtx;
import org.thingsboard.server.transport.mqtt.session.DeviceSessionCtx;
import org.thingsboard.server.transport.mqtt.util.SslUtil;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import static io.netty.handler.codec.mqtt.MqttConnectReturnCode.*;
import static io.netty.handler.codec.mqtt.MqttMessageType.*;
import static io.netty.handler.codec.mqtt.MqttQoS.*;
import static org.thingsboard.server.common.msg.session.MsgType.*;
import static org.thingsboard.server.transport.mqtt.MqttTopics.*;
/**
* @author Andrew Shvayka
*/
@Slf4j
public class MqttTransportHandler extends ChannelInboundHandlerAdapter implements GenericFutureListener<Future<? super Void>> {
public static final MqttQoS MAX_SUPPORTED_QOS_LVL = AT_LEAST_ONCE;
private final DeviceSessionCtx deviceSessionCtx;
private final String sessionId;
private final MqttTransportAdaptor adaptor;
private final SessionMsgProcessor processor;
private final DeviceService deviceService;
private final DeviceAuthService authService;
private final SslHandler sslHandler;
private volatile boolean connected;
private volatile GatewaySessionCtx gatewaySessionCtx;
public MqttTransportHandler(SessionMsgProcessor processor, DeviceService deviceService, DeviceAuthService authService,
MqttTransportAdaptor adaptor, SslHandler sslHandler) {
this.processor = processor;
this.deviceService = deviceService;
this.authService = authService;
this.adaptor = adaptor;
this.deviceSessionCtx = new DeviceSessionCtx(processor, authService, adaptor);
this.sessionId = deviceSessionCtx.getSessionId().toUidStr();
this.sslHandler = sslHandler;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
log.trace("[{}] Processing msg: {}", sessionId, msg);
if (msg instanceof MqttMessage) {
processMqttMsg(ctx, (MqttMessage) msg);
}
}
private void processMqttMsg(ChannelHandlerContext ctx, MqttMessage msg) {
deviceSessionCtx.setChannel(ctx);
switch (msg.fixedHeader().messageType()) {
case CONNECT:
processConnect(ctx, (MqttConnectMessage) msg);
break;
case PUBLISH:
processPublish(ctx, (MqttPublishMessage) msg);
break;
case SUBSCRIBE:
processSubscribe(ctx, (MqttSubscribeMessage) msg);
break;
case UNSUBSCRIBE:
processUnsubscribe(ctx, (MqttUnsubscribeMessage) msg);
break;
case PINGREQ:
if (checkConnected(ctx)) {
ctx.writeAndFlush(new MqttMessage(new MqttFixedHeader(PINGRESP, false, AT_MOST_ONCE, false, 0)));
}
break;
case DISCONNECT:
if (checkConnected(ctx)) {
processDisconnect(ctx);
}
break;
}
}
private void processPublish(ChannelHandlerContext ctx, MqttPublishMessage mqttMsg) {
if (!checkConnected(ctx)) {
return;
}
String topicName = mqttMsg.variableHeader().topicName();
int msgId = mqttMsg.variableHeader().messageId();
log.trace("[{}] Processing publish msg [{}][{}]!", sessionId, topicName, msgId);
if (topicName.startsWith(BASE_GATEWAY_API_TOPIC)) {
if (gatewaySessionCtx != null) {
gatewaySessionCtx.setChannel(ctx);
try {
if (topicName.equals(GATEWAY_TELEMETRY_TOPIC)) {
gatewaySessionCtx.onDeviceTelemetry(mqttMsg);
} else if (topicName.equals(GATEWAY_ATTRIBUTES_TOPIC)) {
gatewaySessionCtx.onDeviceAttributes(mqttMsg);
} else if (topicName.equals(GATEWAY_ATTRIBUTES_REQUEST_TOPIC)) {
gatewaySessionCtx.onDeviceAttributesRequest(mqttMsg);
} else if (topicName.equals(GATEWAY_RPC_TOPIC)) {
gatewaySessionCtx.onDeviceRpcResponse(mqttMsg);
} else if (topicName.equals(GATEWAY_CONNECT_TOPIC)) {
gatewaySessionCtx.onDeviceConnect(mqttMsg);
} else if (topicName.equals(GATEWAY_DISCONNECT_TOPIC)) {
gatewaySessionCtx.onDeviceDisconnect(mqttMsg);
}
} catch (RuntimeException | AdaptorException e) {
log.warn("[{}] Failed to process publish msg [{}][{}]", sessionId, topicName, msgId, e);
}
}
} else {
processDevicePublish(ctx, mqttMsg, topicName, msgId);
}
}
private void processDevicePublish(ChannelHandlerContext ctx, MqttPublishMessage mqttMsg, String topicName, int msgId) {
AdaptorToSessionActorMsg msg = null;
try {
if (topicName.equals(DEVICE_TELEMETRY_TOPIC)) {
msg = adaptor.convertToActorMsg(deviceSessionCtx, POST_TELEMETRY_REQUEST, mqttMsg);
} else if (topicName.equals(DEVICE_ATTRIBUTES_TOPIC)) {
msg = adaptor.convertToActorMsg(deviceSessionCtx, POST_ATTRIBUTES_REQUEST, mqttMsg);
} else if (topicName.startsWith(DEVICE_ATTRIBUTES_REQUEST_TOPIC_PREFIX)) {
msg = adaptor.convertToActorMsg(deviceSessionCtx, GET_ATTRIBUTES_REQUEST, mqttMsg);
if (msgId >= 0) {
ctx.writeAndFlush(createMqttPubAckMsg(msgId));
}
} else if (topicName.startsWith(DEVICE_RPC_RESPONSE_TOPIC)) {
msg = adaptor.convertToActorMsg(deviceSessionCtx, TO_DEVICE_RPC_RESPONSE, mqttMsg);
if (msgId >= 0) {
ctx.writeAndFlush(createMqttPubAckMsg(msgId));
}
} else if (topicName.startsWith(DEVICE_RPC_REQUESTS_TOPIC)) {
msg = adaptor.convertToActorMsg(deviceSessionCtx, TO_SERVER_RPC_REQUEST, mqttMsg);
if (msgId >= 0) {
ctx.writeAndFlush(createMqttPubAckMsg(msgId));
}
}
} catch (AdaptorException e) {
log.warn("[{}] Failed to process publish msg [{}][{}]", sessionId, topicName, msgId, e);
}
if (msg != null) {
processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(), msg));
} else {
log.info("[{}] Closing current session due to invalid publish msg [{}][{}]", sessionId, topicName, msgId);
ctx.close();
}
}
private void processSubscribe(ChannelHandlerContext ctx, MqttSubscribeMessage mqttMsg) {
if (!checkConnected(ctx)) {
return;
}
log.trace("[{}] Processing subscription [{}]!", sessionId, mqttMsg.variableHeader().messageId());
List<Integer> grantedQoSList = new ArrayList<>();
for (MqttTopicSubscription subscription : mqttMsg.payload().topicSubscriptions()) {
String topicName = subscription.topicName();
//TODO: handle this qos level.
MqttQoS reqQoS = subscription.qualityOfService();
try {
if (topicName.equals(DEVICE_ATTRIBUTES_TOPIC)) {
AdaptorToSessionActorMsg msg = adaptor.convertToActorMsg(deviceSessionCtx, SUBSCRIBE_ATTRIBUTES_REQUEST, mqttMsg);
processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(), msg));
grantedQoSList.add(getMinSupportedQos(reqQoS));
} else if (topicName.equals(DEVICE_RPC_REQUESTS_SUB_TOPIC)) {
AdaptorToSessionActorMsg msg = adaptor.convertToActorMsg(deviceSessionCtx, SUBSCRIBE_RPC_COMMANDS_REQUEST, mqttMsg);
processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(), msg));
grantedQoSList.add(getMinSupportedQos(reqQoS));
} else if (topicName.equals(DEVICE_RPC_RESPONSE_SUB_TOPIC)) {
grantedQoSList.add(getMinSupportedQos(reqQoS));
} else if (topicName.equals(DEVICE_ATTRIBUTES_RESPONSES_TOPIC)) {
deviceSessionCtx.setAllowAttributeResponses();
grantedQoSList.add(getMinSupportedQos(reqQoS));
} else {
log.warn("[{}] Failed to subscribe to [{}][{}]", sessionId, topicName, reqQoS);
grantedQoSList.add(FAILURE.value());
}
} catch (AdaptorException e) {
log.warn("[{}] Failed to subscribe to [{}][{}]", sessionId, topicName, reqQoS);
grantedQoSList.add(FAILURE.value());
}
}
ctx.writeAndFlush(createSubAckMessage(mqttMsg.variableHeader().messageId(), grantedQoSList));
}
private void processUnsubscribe(ChannelHandlerContext ctx, MqttUnsubscribeMessage mqttMsg) {
if (!checkConnected(ctx)) {
return;
}
log.trace("[{}] Processing subscription [{}]!", sessionId, mqttMsg.variableHeader().messageId());
for (String topicName : mqttMsg.payload().topics()) {
try {
if (topicName.equals(DEVICE_ATTRIBUTES_TOPIC)) {
AdaptorToSessionActorMsg msg = adaptor.convertToActorMsg(deviceSessionCtx, UNSUBSCRIBE_ATTRIBUTES_REQUEST, mqttMsg);
processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(), msg));
} else if (topicName.equals(DEVICE_RPC_REQUESTS_SUB_TOPIC)) {
AdaptorToSessionActorMsg msg = adaptor.convertToActorMsg(deviceSessionCtx, UNSUBSCRIBE_RPC_COMMANDS_REQUEST, mqttMsg);
processor.process(new BasicToDeviceActorSessionMsg(deviceSessionCtx.getDevice(), msg));
} else if (topicName.equals(DEVICE_ATTRIBUTES_RESPONSES_TOPIC)) {
deviceSessionCtx.setDisallowAttributeResponses();
}
} catch (AdaptorException e) {
log.warn("[{}] Failed to process unsubscription [{}] to [{}]", sessionId, mqttMsg.variableHeader().messageId(), topicName);
}
}
ctx.writeAndFlush(createUnSubAckMessage(mqttMsg.variableHeader().messageId()));
}
private MqttMessage createUnSubAckMessage(int msgId) {
MqttFixedHeader mqttFixedHeader =
new MqttFixedHeader(UNSUBACK, false, AT_LEAST_ONCE, false, 0);
MqttMessageIdVariableHeader mqttMessageIdVariableHeader = MqttMessageIdVariableHeader.from(msgId);
return new MqttMessage(mqttFixedHeader, mqttMessageIdVariableHeader);
}
private void processConnect(ChannelHandlerContext ctx, MqttConnectMessage msg) {
log.info("[{}] Processing connect msg for client: {}!", sessionId, msg.payload().clientIdentifier());
X509Certificate cert;
if (sslHandler != null && (cert = getX509Certificate()) != null) {
processX509CertConnect(ctx, cert);
} else {
processAuthTokenConnect(ctx, msg);
}
}
private void processAuthTokenConnect(ChannelHandlerContext ctx, MqttConnectMessage msg) {
String userName = msg.payload().userName();
if (StringUtils.isEmpty(userName)) {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_REFUSED_BAD_USER_NAME_OR_PASSWORD));
ctx.close();
} else if (!deviceSessionCtx.login(new DeviceTokenCredentials(msg.payload().userName()))) {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_REFUSED_NOT_AUTHORIZED));
ctx.close();
} else {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_ACCEPTED));
connected = true;
checkGatewaySession();
}
}
private void processX509CertConnect(ChannelHandlerContext ctx, X509Certificate cert) {
try {
String strCert = SslUtil.getX509CertificateString(cert);
String sha3Hash = EncryptionUtil.getSha3Hash(strCert);
if (deviceSessionCtx.login(new DeviceX509Credentials(sha3Hash))) {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_ACCEPTED));
connected = true;
checkGatewaySession();
} else {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_REFUSED_NOT_AUTHORIZED));
ctx.close();
}
} catch (Exception e) {
ctx.writeAndFlush(createMqttConnAckMsg(CONNECTION_REFUSED_NOT_AUTHORIZED));
ctx.close();
}
}
private X509Certificate getX509Certificate() {
try {
X509Certificate[] certChain = sslHandler.engine().getSession().getPeerCertificateChain();
if (certChain.length > 0) {
return certChain[0];
}
} catch (SSLPeerUnverifiedException e) {
log.warn(e.getMessage());
return null;
}
return null;
}
private void processDisconnect(ChannelHandlerContext ctx) {
ctx.close();
processor.process(SessionCloseMsg.onDisconnect(deviceSessionCtx.getSessionId()));
if (gatewaySessionCtx != null) {
gatewaySessionCtx.onGatewayDisconnect();
}
}
private MqttConnAckMessage createMqttConnAckMsg(MqttConnectReturnCode returnCode) {
MqttFixedHeader mqttFixedHeader =
new MqttFixedHeader(CONNACK, false, AT_MOST_ONCE, false, 0);
MqttConnAckVariableHeader mqttConnAckVariableHeader =
new MqttConnAckVariableHeader(returnCode, true);
return new MqttConnAckMessage(mqttFixedHeader, mqttConnAckVariableHeader);
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
log.error("[{}] Unexpected Exception", sessionId, cause);
ctx.close();
}
private static MqttSubAckMessage createSubAckMessage(Integer msgId, List<Integer> grantedQoSList) {
MqttFixedHeader mqttFixedHeader =
new MqttFixedHeader(SUBACK, false, AT_LEAST_ONCE, false, 0);
MqttMessageIdVariableHeader mqttMessageIdVariableHeader = MqttMessageIdVariableHeader.from(msgId);
MqttSubAckPayload mqttSubAckPayload = new MqttSubAckPayload(grantedQoSList);
return new MqttSubAckMessage(mqttFixedHeader, mqttMessageIdVariableHeader, mqttSubAckPayload);
}
private static int getMinSupportedQos(MqttQoS reqQoS) {
return Math.min(reqQoS.value(), MAX_SUPPORTED_QOS_LVL.value());
}
public static MqttPubAckMessage createMqttPubAckMsg(int requestId) {
MqttFixedHeader mqttFixedHeader =
new MqttFixedHeader(PUBACK, false, AT_LEAST_ONCE, false, 0);
MqttMessageIdVariableHeader mqttMsgIdVariableHeader =
MqttMessageIdVariableHeader.from(requestId);
return new MqttPubAckMessage(mqttFixedHeader, mqttMsgIdVariableHeader);
}
private boolean checkConnected(ChannelHandlerContext ctx) {
if (connected) {
return true;
} else {
log.info("[{}] Closing current session due to invalid msg order [{}][{}]", sessionId);
ctx.close();
return false;
}
}
private void checkGatewaySession() {
Device device = deviceSessionCtx.getDevice();
JsonNode infoNode = device.getAdditionalInfo();
if (infoNode != null) {
JsonNode gatewayNode = infoNode.get("gateway");
if (gatewayNode != null && gatewayNode.asBoolean()) {
gatewaySessionCtx = new GatewaySessionCtx(processor, deviceService, authService, deviceSessionCtx);
}
}
}
@Override
public void operationComplete(Future<? super Void> future) throws Exception {
processor.process(SessionCloseMsg.onError(deviceSessionCtx.getSessionId()));
}
}