MQTT EventForwarder added

3 files changed, 113 insertions, 4 deletions

diff --git a/build.gradle b/build.gradle
index a48a07be5..91ba2cd5c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -84,6 +84,7 @@ dependencies {
     implementation "javax.activation:activation:1.1.1"
     implementation "com.amazonaws:aws-java-sdk-sns:1.12.349"
     implementation "org.apache.kafka:kafka-clients:3.3.1"
+    implementation 'com.hivemq:hivemq-mqtt-client:1.3.0'
     implementation("com.google.firebase:firebase-admin:9.1.1") {
         exclude group: 'com.google.cloud', module: 'google-cloud-firestore'
         exclude group: 'com.google.cloud', module: 'google-cloud-storage'
diff --git a/src/main/java/org/traccar/MainModule.java b/src/main/java/org/traccar/MainModule.java
index a8f895d3b..55b26010f 100644
--- a/src/main/java/org/traccar/MainModule.java
+++ b/src/main/java/org/traccar/MainModule.java
@@ -38,6 +38,7 @@ import org.traccar.database.StatisticsManager;
 import org.traccar.forward.EventForwarder;
 import org.traccar.forward.EventForwarderJson;
 import org.traccar.forward.EventForwarderKafka;
+import org.traccar.forward.EventForwarderMqtt;
 import org.traccar.forward.PositionForwarder;
 import org.traccar.forward.PositionForwarderJson;
 import org.traccar.forward.PositionForwarderKafka;
@@ -322,10 +323,14 @@ public class MainModule extends AbstractModule {
     @Provides
     public static EventForwarder provideEventForwarder(Config config, Client client, ObjectMapper objectMapper) {
         if (config.hasKey(Keys.EVENT_FORWARD_URL)) {
-            if (config.getString(Keys.EVENT_FORWARD_TYPE).equals("kafka")) {
-                return new EventForwarderKafka(config, objectMapper);
-            } else {
-                return new EventForwarderJson(config, client);
+            String forwardType = config.getString(Keys.EVENT_FORWARD_TYPE);
+            switch (forwardType) {
+                case "kafka":
+                    return new EventForwarderKafka(config, objectMapper);
+                case "mqtt":
+                    return new EventForwarderMqtt(config, objectMapper);
+                default:
+                    return new EventForwarderJson(config, client);
             }
         }
         return null;
diff --git a/src/main/java/org/traccar/forward/EventForwarderMqtt.java b/src/main/java/org/traccar/forward/EventForwarderMqtt.java
new file mode 100644
index 000000000..dc95cb4e2
--- /dev/null
+++ b/src/main/java/org/traccar/forward/EventForwarderMqtt.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2022 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.forward;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.hivemq.client.mqtt.datatypes.MqttQos;
+import com.hivemq.client.mqtt.mqtt5.Mqtt5AsyncClient;
+import com.hivemq.client.mqtt.mqtt5.Mqtt5Client;
+import com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5SimpleAuth;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.UUID;
+
+public class EventForwarderMqtt implements EventForwarder {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(EventForwarderMqtt.class);
+    private final Mqtt5AsyncClient client;
+    private final ObjectMapper objectMapper;
+
+    private final String topic;
+
+    public EventForwarderMqtt(Config config, ObjectMapper objectMapper) {
+        URI url;
+        try {
+            url = new URI(config.getString(Keys.EVENT_FORWARD_URL));
+        } catch (URISyntaxException e) {
+            throw new RuntimeException(e);
+        }
+
+        String userInfo = url.getUserInfo();
+        Mqtt5SimpleAuth simpleAuth = null;
+        if (userInfo != null) {
+            int delimiter = userInfo.indexOf(':');
+            if (delimiter == -1) {
+                throw new IllegalArgumentException("Wrong credentials. Should be in format \"username:password\"");
+            } else {
+                simpleAuth = Mqtt5SimpleAuth.builder()
+                        .username(userInfo.substring(0, delimiter++))
+                        .password(userInfo.substring(delimiter).getBytes())
+                        .build();
+            }
+        }
+
+        String host = url.getHost();
+        int port = url.getPort();
+        client = Mqtt5Client.builder()
+                .identifier("traccar-" + UUID.randomUUID().toString())
+                .serverHost(host)
+                .serverPort(port)
+                .simpleAuth(simpleAuth)
+                .automaticReconnectWithDefaultConfig()
+                .buildAsync();
+
+        client.connectWith()
+                .send()
+                .whenComplete((message, e) -> {
+                    if (e != null) {
+                        throw new RuntimeException(e);
+                    }
+                });
+
+        this.objectMapper = objectMapper;
+        topic = config.getString(Keys.EVENT_FORWARD_TOPIC);
+    }
+
+    @Override
+    public void forward(EventData eventData, ResultHandler resultHandler) {
+        byte[] payload;
+        try {
+            payload = objectMapper.writeValueAsString(eventData).getBytes();
+        } catch (JsonProcessingException e) {
+            resultHandler.onResult(false, e);
+            return;
+        }
+
+        client.publishWith()
+                .topic(topic)
+                .qos(MqttQos.AT_LEAST_ONCE)
+                .payload(payload)
+                .send()
+                .whenComplete((message, e) -> resultHandler.onResult(e == null, e));
+    }
+
+}