improved mqtt publisher to support any topic

components/extensions/cdmf-transport-adapters/output/io.entgra.device.mgt.plugins.output.adapter.mqtt/src/main/java/io/entgra/device/mgt/plugins/output/adapter/mqtt/MQTTEventAdapterFactory.java

@@ -94,12 +94,18 @@ public class MQTTEventAdapterFactory extends OutputEventAdapterFactory {
         qos.setOptions(new String[]{"0", "1", "2"});
         qos.setDefaultValue("2");
 
+        // set topic
+        Property topicProperty = new Property(MQTTEventAdapterConstants.ADAPTER_MESSAGE_TOPIC);
+        topicProperty.setDisplayName(resourceBundle.getString(MQTTEventAdapterConstants.ADAPTER_MESSAGE_TOPIC));
+        topicProperty.setRequired(false);
+
         staticPropertyList.add(brokerUrl);
         staticPropertyList.add(userName);
         staticPropertyList.add(scopes);
         staticPropertyList.add(clearSession);
         staticPropertyList.add(qos);
         staticPropertyList.add(password);
+        staticPropertyList.add(topicProperty);
         return staticPropertyList;
     }
 

components/extensions/cdmf-transport-adapters/output/io.entgra.device.mgt.plugins.output.adapter.mqtt/src/main/java/io/entgra/device/mgt/plugins/output/adapter/mqtt/util/MQTTAdapterPublisher.java

@@ -17,23 +17,6 @@
 */
 package io.entgra.device.mgt.plugins.output.adapter.mqtt.util;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.apache.commons.ssl.Base64;
-import org.apache.http.HttpResponse;
-import org.apache.http.client.HttpClient;
-import org.apache.http.client.methods.HttpPost;
-import org.apache.http.entity.ContentType;
-import org.apache.http.entity.StringEntity;
-import org.apache.http.message.BasicHeader;
-import org.eclipse.paho.client.mqttv3.MqttClient;
-import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
-import org.eclipse.paho.client.mqttv3.MqttException;
-import org.eclipse.paho.client.mqttv3.MqttMessage;
-import org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence;
-import org.json.simple.JSONObject;
-import org.json.simple.parser.JSONParser;
-import org.json.simple.parser.ParseException;
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.DCRResponse;
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.TokenRequest;
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.TokenResponse;
@@ -41,13 +24,21 @@ import io.entgra.device.mgt.core.apimgt.keymgt.extension.exception.BadRequestExc
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.exception.KeyMgtException;
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.service.KeyMgtService;
 import io.entgra.device.mgt.core.apimgt.keymgt.extension.service.KeyMgtServiceImpl;
+import io.entgra.device.mgt.core.identity.jwt.client.extension.exception.JWTClientException;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.ssl.Base64;
+import org.eclipse.paho.client.mqttv3.MqttClient;
+import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
+import org.eclipse.paho.client.mqttv3.MqttException;
+import org.eclipse.paho.client.mqttv3.MqttMessage;
+import org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence;
+import org.jetbrains.annotations.NotNull;
 import org.wso2.carbon.context.PrivilegedCarbonContext;
 import org.wso2.carbon.event.output.adapter.core.exception.ConnectionUnavailableException;
 import org.wso2.carbon.event.output.adapter.core.exception.OutputEventAdapterException;
 import org.wso2.carbon.event.output.adapter.core.exception.OutputEventAdapterRuntimeException;
-import io.entgra.device.mgt.core.identity.jwt.client.extension.dto.AccessTokenInfo;
-import io.entgra.device.mgt.core.identity.jwt.client.extension.exception.JWTClientException;
-import io.entgra.device.mgt.core.identity.jwt.client.extension.service.JWTClientManagerService;
 import org.wso2.carbon.user.api.UserStoreException;
 
 /**
@@ -153,6 +144,8 @@ public class MQTTAdapterPublisher {
         String dcrUrlString = this.mqttBrokerConnectionConfiguration.getDcrUrl();
 
         if (dcrUrlString != null && !dcrUrlString.isEmpty()) {
+            PrivilegedCarbonContext.startTenantFlow();
+            PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantDomain(tenantDomain, true);
             try {
                 KeyMgtService keyMgtService = new KeyMgtServiceImpl();
                 String applicationName = MQTTEventAdapterConstants.APPLICATION_NAME_PREFIX
@@ -170,6 +163,8 @@ public class MQTTAdapterPublisher {
             } catch (KeyMgtException e) {
                 log.error("Failed to create an application.", e);
                 throw new OutputEventAdapterRuntimeException("Failed to create an application.", e);
+            } finally {
+                PrivilegedCarbonContext.endTenantFlow();
             }
         }
         throw new OutputEventAdapterRuntimeException("Invalid configuration for mqtt publisher");
@@ -177,27 +172,33 @@ public class MQTTAdapterPublisher {
 
     private String getToken(String clientId, String clientSecret)
             throws UserStoreException, JWTClientException {
-        PrivilegedCarbonContext.startTenantFlow();
-        PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantDomain(tenantDomain, true);
         try {
-            String scopes = mqttBrokerConnectionConfiguration.getScopes();
+            TokenRequest tokenRequest = getTokenRequest(clientId, clientSecret);
-            scopes += " perm:topic:pub:" + tenantDomain + ":+:+:operation";
-
-            TokenRequest tokenRequest = new TokenRequest(clientId, clientSecret,
-                    null, scopes.toString(), "client_credentials", null,
-                    null, null, null,  Integer.MAX_VALUE);
             KeyMgtService keyMgtService = new KeyMgtServiceImpl();
             TokenResponse tokenResponse = keyMgtService.generateAccessToken(tokenRequest);
 
             return tokenResponse.getAccessToken();
         } catch (KeyMgtException | BadRequestException e) {
             log.error("Error while generating access token", e);
-        } finally {
-            PrivilegedCarbonContext.endTenantFlow();
         }
         return null;
     }
 
+    @NotNull
+    private TokenRequest getTokenRequest(String clientId, String clientSecret) {
+        String scopes = mqttBrokerConnectionConfiguration.getScopes();
+        scopes += " perm:topic:pub:" + tenantDomain + ":+:+:operation";
+
+        if (!StringUtils.isEmpty(mqttBrokerConnectionConfiguration.getTopic())) {
+            scopes += " perm:topic:pub:" + mqttBrokerConnectionConfiguration.getTopic().replace("/",":");
+        }
+
+        TokenRequest tokenRequest = new TokenRequest(clientId, clientSecret,
+                null, scopes.toString(), "client_credentials", null,
+                null, null, null,  Integer.MAX_VALUE);
+        return tokenRequest;
+    }
+
     private String getBase64Encode(String key, String value) {
         return new String(Base64.encodeBase64((key + ":" + value).getBytes()));
     }

components/extensions/cdmf-transport-adapters/output/io.entgra.device.mgt.plugins.output.adapter.mqtt/src/main/java/io/entgra/device/mgt/plugins/output/adapter/mqtt/util/MQTTBrokerConnectionConfiguration.java

@@ -17,8 +17,8 @@
 */
 package io.entgra.device.mgt.plugins.output.adapter.mqtt.util;
 
+import org.apache.commons.lang3.StringUtils;
 import org.wso2.carbon.event.output.adapter.core.OutputEventAdapterConfiguration;
-import org.wso2.carbon.event.output.adapter.core.exception.OutputEventAdapterException;
 
 import java.util.Map;
 
@@ -36,6 +36,8 @@ public class MQTTBrokerConnectionConfiguration {
     private boolean globalCredentailSet;
     private int qos;
 
+    private String topic;
+
     public String getTokenUrl() {
         return tokenUrl;
     }
@@ -79,6 +81,11 @@ public class MQTTBrokerConnectionConfiguration {
     public int getQos() {
         return qos;
     }
+
+    public String getTopic() {
+        return topic;
+    }
+
     public MQTTBrokerConnectionConfiguration(OutputEventAdapterConfiguration eventAdapterConfiguration,
                                              Map<String, String> globalProperties) {
         adapterName = eventAdapterConfiguration.getName();
@@ -123,7 +130,10 @@ public class MQTTBrokerConnectionConfiguration {
             this.qos = Integer.parseInt(qosVal);
         }
 
-
+        String topic = eventAdapterConfiguration.getStaticProperties().get(MQTTEventAdapterConstants.ADAPTER_MESSAGE_TOPIC);
+        if (!StringUtils.isEmpty(topic)) {
+            this.topic = topic;
+        }
     }
 
 }