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Import api from advancedcore
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‎SimpleAPI/.settings/org.eclipse.core.resources.prefs‎

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eclipse.preferences.version=1
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encoding//src/main/java=Cp1252
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encoding//src/main/java/com/bencodez/simpleapi/servercomm/mqtt/MqttServerComm.java=UTF-8
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encoding//src/main/resources=Cp1252
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encoding//src/test/java=Cp1252
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encoding//src/test/resources=Cp1252

‎SimpleAPI/pom.xml‎

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<version>3.4.1</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.eclipse.paho</groupId>
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<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
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<version>1.2.5</version>
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</dependency>
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<dependency>
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<groupId>redis.clients</groupId>
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<artifactId>jedis</artifactId>
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<version>5.0.2</version>
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</dependency>
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</dependencies>
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<profiles>
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<profile>

‎SimpleAPI/src/main/java/com/bencodez/simpleapi/encryption/EncryptionHandler.java‎

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package com.bencodez.simpleapi.encryption;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.util.Base64;
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import javax.crypto.Cipher;
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import javax.crypto.KeyGenerator;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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public class EncryptionHandler {
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private static Cipher dcipher;
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private static Cipher ecipher;
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private static SecretKey key;
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public EncryptionHandler(String pluginName, File file) {
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try {
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if (file.exists()) {
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loadKey(file);
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} else {
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generateKey();
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save(file);
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}
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ecipher = Cipher.getInstance("AES");
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dcipher = Cipher.getInstance("AES");
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// initialize the ciphers with the given key
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ecipher.init(Cipher.ENCRYPT_MODE, key);
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dcipher.init(Cipher.DECRYPT_MODE, key);
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String msg = "This is a classified message!";
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String encrypted = encrypt(msg);
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String decrypted = decrypt(encrypted);
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if (!msg.equals(decrypted)) {
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System.out.println(pluginName + ": Encryption/Decryption failed: " + decrypted);
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}
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} catch (NoSuchAlgorithmException e) {
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System.out.println("No Such Algorithm:" + e.getMessage());
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e.printStackTrace();
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} catch (NoSuchPaddingException e) {
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System.out.println("No Such Padding:" + e.getMessage());
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e.printStackTrace();
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} catch (InvalidKeyException e) {
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System.out.println("Invalid Key:" + e.getMessage());
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e.printStackTrace();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public String decrypt(String str) {
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try {
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// decode with base64 to get bytes
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byte[] dec = Base64.getDecoder().decode(str.getBytes());
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byte[] utf8 = dcipher.doFinal(dec);
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// create new string based on the specified charset
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return new String(utf8, "UTF8");
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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public String encrypt(String str) {
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try {
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// encode the string into a sequence of bytes using the named charset
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// storing the result into a new byte array.
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byte[] utf8 = str.getBytes("UTF8");
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byte[] enc = ecipher.doFinal(utf8);
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return Base64.getEncoder().encodeToString(enc);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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private void generateKey() throws NoSuchAlgorithmException {
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KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
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keyGenerator.init(256); // Use 256-bit AES
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key = keyGenerator.generateKey();
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}
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private void loadKey(File file) throws IOException {
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String str = new String(Files.readAllBytes(Paths.get(file.getAbsolutePath())));
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key = new SecretKeySpec(Base64.getDecoder().decode(str), "AES");
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}
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public void save(File file) throws IOException {
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FileWriter fileWriter = new FileWriter(file);
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fileWriter.write(Base64.getEncoder().withoutPadding().encodeToString(key.getEncoded()));
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fileWriter.close();
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}
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}

‎SimpleAPI/src/main/java/com/bencodez/simpleapi/servercomm/mqtt/MqttHandler.java‎

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package com.bencodez.simpleapi.servercomm.mqtt;
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import java.util.UUID;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ScheduledExecutorService;
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import java.util.concurrent.TimeUnit;
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/**
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* General-purpose MQTT communication handler with support for RPC and pub/sub.
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*/
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public class MqttHandler {
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public interface MessageHandler {
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void onMessage(String topic, String payload);
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}
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public interface RpcCallback {
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void onComplete(RpcResponse response, Exception error);
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}
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public static class RpcResponse {
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private final String requestId;
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private final String payload;
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public RpcResponse(String requestId, String payload) {
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this.requestId = requestId;
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this.payload = payload;
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}
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public String getRequestId() {
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return requestId;
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}
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public String getPayload() {
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return payload;
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}
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}
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private final MqttServerComm mqtt;
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private final ConcurrentHashMap<String, RpcCallback> pendingRpcs = new ConcurrentHashMap<>();
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private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
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private int defaultQos;
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public MqttHandler(MqttServerComm mqtt, int defaultQos) {
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this.mqtt = mqtt;
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setDefaultQos(defaultQos);
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}
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public MqttHandler(MqttServerComm mqtt) {
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this(mqtt, 2);
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}
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public void setDefaultQos(int qos) {
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if (qos < 0 || qos > 2) {
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throw new IllegalArgumentException("QoS must be 0, 1, or 2");
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}
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this.defaultQos = qos;
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}
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public void connect() throws Exception {
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mqtt.connect();
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}
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public void disconnect() throws Exception {
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mqtt.disconnect();
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scheduler.shutdownNow();
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}
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public boolean isConnected() {
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return mqtt.isConnected();
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}
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public void publish(String topic, String message) throws Exception {
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mqtt.publish(topic, message, defaultQos, false);
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}
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public void subscribe(String topicFilter, MessageHandler handler) throws Exception {
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mqtt.subscribe(topicFilter, defaultQos, (topic, msg) -> {
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handler.onMessage(topic, new String(msg.getPayload()));
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});
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}
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public void unsubscribe(String topicFilter) throws Exception {
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mqtt.unsubscribe(topicFilter);
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}
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public void request(String topic, String message, long timeoutMillis, RpcCallback callback) throws Exception {
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String requestId = UUID.randomUUID().toString();
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pendingRpcs.put(requestId, callback);
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scheduler.schedule(() -> {
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RpcCallback cb = pendingRpcs.remove(requestId);
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if (cb != null) {
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cb.onComplete(null, new Exception("RPC timeout"));
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}
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}, timeoutMillis, TimeUnit.MILLISECONDS);
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mqtt.publish(topic + "/" + requestId, message, defaultQos, false);
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}
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public void handleRpcResponse(String topic, String payload) {
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String[] parts = topic.split("/");
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if (parts.length == 0) return;
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String requestId = parts[parts.length - 1];
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RpcCallback cb = pendingRpcs.remove(requestId);
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if (cb != null) {
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cb.onComplete(new RpcResponse(requestId, payload), null);
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}
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}
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}

‎SimpleAPI/src/main/java/com/bencodez/simpleapi/servercomm/mqtt/MqttServerComm.java‎

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package com.bencodez.simpleapi.servercomm.mqtt;
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import org.eclipse.paho.client.mqttv3.IMqttActionListener;
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import org.eclipse.paho.client.mqttv3.IMqttAsyncClient;
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import org.eclipse.paho.client.mqttv3.IMqttToken;
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import org.eclipse.paho.client.mqttv3.MqttAsyncClient;
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import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
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import org.eclipse.paho.client.mqttv3.MqttException;
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import org.eclipse.paho.client.mqttv3.MqttMessage;
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/**
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* Very basic MQTT client wrapper using Eclipse Paho.
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* Provides connect/disconnect, publish, subscribe, and serverId access.
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*/
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public class MqttServerComm {
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private final String serverId;
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private final IMqttAsyncClient client;
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public MqttServerComm(String serverId, String brokerUrl, MqttConnectOptions opts) throws MqttException {
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this.serverId = serverId;
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this.client = new MqttAsyncClient(brokerUrl, serverId);
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this.client.connect(opts).waitForCompletion();
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}
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public String getServerId() {
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return serverId;
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}
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public void connect() throws MqttException {
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if (!client.isConnected()) {
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client.reconnect();
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}
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}
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public void disconnect() throws MqttException {
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if (client.isConnected()) {
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client.disconnect();
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}
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}
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public boolean isConnected() {
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return client.isConnected();
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}
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public void publish(String topic, String payload, int qos, boolean retained) throws MqttException {
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MqttMessage msg = new MqttMessage(payload.getBytes());
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msg.setQos(qos);
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msg.setRetained(retained);
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client.publish(topic, msg);
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}
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public void subscribe(String topicFilter, int qos, MessageListener listener) throws MqttException {
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client.subscribe(topicFilter, qos, null, new IMqttActionListener() {
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@Override
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public void onSuccess(IMqttToken asyncActionToken) { /* no‑op */ }
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@Override
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public void onFailure(IMqttToken asyncActionToken, Throwable exception) { exception.printStackTrace(); }
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}, (topic, msg) -> listener.messageArrived(topic, msg));
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}
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public void unsubscribe(String topicFilter) throws MqttException {
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client.unsubscribe(topicFilter);
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}
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/** Simple bridge from Paho’s callback to our handler. */
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public interface MessageListener {
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void messageArrived(String topic, MqttMessage message) throws Exception;
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}
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}

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