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/*
* Copyright 2023 Anton Tananaev (anton@traccar.org)
*
* 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.traccar;
import io.netty.channel.Channel;
import io.netty.handler.codec.mqtt.MqttConnectMessage;
import io.netty.handler.codec.mqtt.MqttConnectReturnCode;
import io.netty.handler.codec.mqtt.MqttMessage;
import io.netty.handler.codec.mqtt.MqttMessageBuilders;
import io.netty.handler.codec.mqtt.MqttPublishMessage;
import io.netty.handler.codec.mqtt.MqttSubscribeMessage;
import org.traccar.session.DeviceSession;
import java.net.SocketAddress;
public abstract class BaseMqttProtocolDecoder extends BaseProtocolDecoder {
public BaseMqttProtocolDecoder(Protocol protocol) {
super(protocol);
}
protected abstract Object decode(DeviceSession deviceSession, MqttPublishMessage message) throws Exception;
@Override
protected final Object decode(
Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
if (msg instanceof MqttConnectMessage message) {
DeviceSession deviceSession = getDeviceSession(
channel, remoteAddress, message.payload().clientIdentifier());
MqttConnectReturnCode returnCode = deviceSession != null
? MqttConnectReturnCode.CONNECTION_ACCEPTED
: MqttConnectReturnCode.CONNECTION_REFUSED_IDENTIFIER_REJECTED;
MqttMessage response = MqttMessageBuilders.connAck().returnCode(returnCode).build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
} else if (msg instanceof MqttSubscribeMessage message) {
MqttMessage response = MqttMessageBuilders.subAck()
.packetId(message.variableHeader().messageId())
.build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
} else if (msg instanceof MqttPublishMessage message) {
DeviceSession deviceSession = getDeviceSession(channel, remoteAddress);
if (deviceSession == null) {
return null;
}
Object result = decode(deviceSession, message);
MqttMessage response = MqttMessageBuilders.pubAck()
.packetId(message.variableHeader().packetId())
.build();
if (channel != null) {
channel.writeAndFlush(new NetworkMessage(response, remoteAddress));
}
return result;
}
return null;
}
}
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