nandorsoma commented on code in PR #6225: URL: https://github.com/apache/nifi/pull/6225#discussion_r952879128
########## nifi-nar-bundles/nifi-mqtt-bundle/nifi-mqtt-processors/src/main/java/org/apache/nifi/processors/mqtt/adapters/HiveMqV5ClientAdapter.java: ########## @@ -0,0 +1,194 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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.apache.nifi.processors.mqtt.adapters; + +import com.hivemq.client.mqtt.datatypes.MqttQos; +import com.hivemq.client.mqtt.mqtt5.Mqtt5BlockingClient; +import com.hivemq.client.mqtt.mqtt5.Mqtt5Client; +import com.hivemq.client.mqtt.mqtt5.message.connect.Mqtt5Connect; +import com.hivemq.client.mqtt.mqtt5.message.connect.Mqtt5ConnectBuilder; +import org.apache.nifi.processors.mqtt.common.MqttConnectionProperties; +import org.apache.nifi.processors.mqtt.common.NifiMqttCallback; +import org.apache.nifi.processors.mqtt.common.NifiMqttClient; +import org.apache.nifi.processors.mqtt.common.NifiMqttException; +import org.apache.nifi.processors.mqtt.common.NifiMqttMessage; + +import javax.net.ssl.KeyManagerFactory; +import javax.net.ssl.TrustManagerFactory; +import java.io.FileInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.nio.ByteBuffer; +import java.nio.CharBuffer; +import java.nio.charset.StandardCharsets; +import java.security.KeyStore; +import java.security.KeyStoreException; +import java.security.NoSuchAlgorithmException; +import java.security.cert.CertificateException; +import java.util.Arrays; +import java.util.Objects; + +public class HiveMqV5ClientAdapter implements NifiMqttClient { + + private final Mqtt5Client mqtt5Client; + + private NifiMqttCallback callback; + + public HiveMqV5ClientAdapter(Mqtt5BlockingClient mqtt5BlockingClient) { + this.mqtt5Client = mqtt5BlockingClient; + } + + @Override + public boolean isConnected() { + return mqtt5Client.getState().isConnected(); + } + + @Override + public void connect(MqttConnectionProperties connectionProperties) throws NifiMqttException { + final Mqtt5ConnectBuilder connectBuilder = Mqtt5Connect.builder() + .keepAlive(connectionProperties.getKeepAliveInterval()); + + final boolean cleanSession = connectionProperties.isCleanSession(); + connectBuilder.cleanStart(cleanSession); + if (!cleanSession) { + connectBuilder.sessionExpiryInterval(connectionProperties.getSessionExpiryInterval()); + } + + final String lastWillTopic = connectionProperties.getLastWillTopic(); + if (lastWillTopic != null) { + connectBuilder.willPublish() + .topic(lastWillTopic) + .payload(connectionProperties.getLastWillMessage().getBytes()) + .retain(connectionProperties.getLastWillRetain()) + .qos(MqttQos.fromCode(connectionProperties.getLastWillQOS())) + .applyWillPublish(); + } + + // checking for presence of password because username can be null + final char[] password = connectionProperties.getPassword(); + if (password != null) { + connectBuilder.simpleAuth() + .username(connectionProperties.getUsername()) + .password(toBytes(password)) + .applySimpleAuth(); + + clearSensitive(connectionProperties.getPassword()); + clearSensitive(password); + } + + final Mqtt5Connect mqtt5Connect = connectBuilder.build(); + mqtt5Client.toBlocking().connect(mqtt5Connect); + } + + @Override + public void disconnect(long disconnectTimeout) throws NifiMqttException { + // Currently it is not possible to set timeout for disconnect with HiveMQ Client. (Only connect timeout exists.) + mqtt5Client.toBlocking().disconnect(); + } + + @Override + public void close() throws NifiMqttException { + // there is no paho's close equivalent in hivemq client + } + + @Override + public void publish(String topic, NifiMqttMessage message) throws NifiMqttException { + mqtt5Client.toAsync().publishWith() + .topic(topic) + .payload(message.getPayload()) + .retain(message.isRetained()) + .qos(Objects.requireNonNull(MqttQos.fromCode(message.getQos()))) + .send(); + } + + @Override + public void subscribe(String topicFilter, int qos) { + Objects.requireNonNull(callback, "callback should be set"); + + mqtt5Client.toAsync().subscribeWith() + .topicFilter(topicFilter) + .qos(Objects.requireNonNull(MqttQos.fromCode(qos))) + .callback(mqtt5Publish -> { + final NifiMqttMessage nifiMqttMessage = new NifiMqttMessage(); + nifiMqttMessage.setPayload(mqtt5Publish.getPayloadAsBytes()); + nifiMqttMessage.setQos(mqtt5Publish.getQos().getCode()); + nifiMqttMessage.setRetained(mqtt5Publish.isRetain()); + try { + callback.messageArrived(mqtt5Publish.getTopic().toString(), nifiMqttMessage); + } catch (Exception e) { + throw new NifiMqttException(e); + } + }) + .send(); + } + + @Override + public void setCallback(NifiMqttCallback callback) { + this.callback = callback; + } + + public static KeyManagerFactory getKeyManagerFactory(String keyStoreType, String path, char[] keyStorePassword) { + try { + final KeyStore keyStore = loadIntoKeyStore(keyStoreType, path, keyStorePassword); + + final KeyManagerFactory kmf = KeyManagerFactory + .getInstance(KeyManagerFactory.getDefaultAlgorithm()); + kmf.init(keyStore, new char[0]); // https://stackoverflow.com/questions/1814048/sun-java-keymanagerfactory-and-null-passwords + + return kmf; + } catch (Exception e) { + throw new RuntimeException(e); + } + } + + public static TrustManagerFactory getTrustManagerFactory(String trustStoreType, String path, char[] keyStorePassword) { + try { + final KeyStore trustStore = loadIntoKeyStore(trustStoreType, path, keyStorePassword); + + final TrustManagerFactory tmf = TrustManagerFactory + .getInstance(TrustManagerFactory.getDefaultAlgorithm()); + tmf.init(trustStore); + + return tmf; + } catch (Exception e) { + throw new RuntimeException(e); + } + } + + private static KeyStore loadIntoKeyStore(String type, String path, char[] keyStorePassword) throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException { + final KeyStore keyStore = KeyStore.getInstance(type); + final InputStream in = new FileInputStream(path); + keyStore.load(in, keyStorePassword); + return keyStore; + } + + private byte[] toBytes(char[] chars) { + final ByteBuffer byteBuffer = StandardCharsets.UTF_8.encode(CharBuffer.wrap(chars)); + final byte[] bytes = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit()); + clearSensitive(byteBuffer.array()); + return bytes; + } + + private void clearSensitive(char[] chars) { Review Comment: Changed, thanks for noticing it. -- This is an automated message from the Apache Git Service. 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