add http proxy support in mqtt3 client

 Signed-off-by: Tony Guo <tony.guo@broadcom.com>

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/MqttConnectOptions.java

@@ -76,6 +76,10 @@ public class MqttConnectOptions {
 	private int maxReconnectDelay = 128000;
 	private boolean skipPortDuringHandshake = false;
 	private Map<String, String> customWebSocketHeaders = null;
+	private String httpProxyHost;
+	private int httpProxyPort;
+	private String httpProxyUser;
+	private String httpProxyPassword;
 
 	// Client Operation Parameters
 	private int executorServiceTimeout = 1; // How long to wait in seconds when terminating the executor service.
@@ -716,6 +720,38 @@ public void setCustomWebSocketHeaders(Map<String, String> props) {
 	public Map<String, String> getCustomWebSocketHeaders() {
 		return customWebSocketHeaders;
 	}
+	public String getHttpProxyHost() {
+		return httpProxyHost;
+	}
+
+	public void setHttpProxyHost(String httpProxyHost) {
+		this.httpProxyHost = httpProxyHost;
+	}
+
+	public int getHttpProxyPort() {
+		return httpProxyPort;
+	}
+
+	public void setHttpProxyPort(int httpProxyPort) {
+		this.httpProxyPort = httpProxyPort;
+	}
+
+	public String getHttpProxyUser() {
+		return httpProxyUser;
+	}
+
+	public void setHttpProxyUser(String httpProxyUser) {
+		this.httpProxyUser = httpProxyUser;
+	}
+
+	public String getHttpProxyPassword() {
+		return httpProxyPassword;
+	}
+
+	public void setHttpProxyPassword(String httpProxyPassword) {
+		this.httpProxyPassword = httpProxyPassword;
+	}
+
 
 	public String toString() {
 		return Debug.dumpProperties(getDebug(), "Connection options");

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/MqttException.java

@@ -139,6 +139,9 @@ public class MqttException extends Exception {
 	 * state.  New up a new client to continue.
 	 */
 	public static final short REASON_CODE_CLIENT_CLOSED		           = 32111;
+
+	/** Unable to connect to server though http proxy*/
+	public static final short REASON_CODE_HTTP_PROXY_CONNECT_ERROR      = 32112;
 
 	/**
 	 * A request has been made to use a token that is already associated with

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/SSLNetworkModuleFactory.java

@@ -82,6 +82,9 @@ public NetworkModule createNetworkModule(URI brokerUri, MqttConnectOptions optio
 				netModule.setEnabledCiphers(enabledCiphers);
 			}
 		}
+
+		netModule.configHttpProxy(options.getHttpProxyHost(), options.getHttpProxyPort(),
+				options.getHttpProxyUser(), options.getHttpProxyPassword());
 		return netModule;
 	}
 }

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/TCPNetworkModule.java

@@ -18,14 +18,17 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
 import java.net.ConnectException;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.net.SocketAddress;
 
 import javax.net.SocketFactory;
 
+import javax.net.ssl.SSLSocketFactory;
 import org.eclipse.paho.client.mqttv3.MqttException;
+import org.eclipse.paho.client.mqttv3.internal.websocket.Base64;
 import org.eclipse.paho.client.mqttv3.logging.Logger;
 import org.eclipse.paho.client.mqttv3.logging.LoggerFactory;
 
@@ -42,6 +45,11 @@ public class TCPNetworkModule implements NetworkModule {
 	private int port;
 	private int conTimeout;
 
+	private String httpProxyHost;
+	private int httpProxyPort;
+	private String httpProxyUser;
+	private String httpProxyPassword;
+
 	/**
 	 * Constructs a new TCPNetworkModule using the specified host and
 	 * port.  The supplied SocketFactory is used to supply the network
@@ -66,19 +74,139 @@ public TCPNetworkModule(SocketFactory factory, String host, int port, String res
 	 */
 	public void start() throws IOException, MqttException {
 		final String methodName = "start";
+
+		// @TRACE 252=connect to host {0} port {1} timeout {2}
+		log.fine(CLASS_NAME,methodName, "252", new Object[] {host, Integer.valueOf(port), Long.valueOf(conTimeout*1000)});
+
+		if(httpProxyHost != null) {
+			Socket tunnel;
+
+			/*
+			 * Set up a socket to do tunneling through the proxy.
+			 * Start it off as a regular socket, then layer SSL
+			 * over the top of it.
+			 */
+			try {
+				tunnel = new Socket(httpProxyHost, httpProxyPort);
+				doTunnelHandshake(tunnel, host, port, httpProxyUser, httpProxyPassword);
+			}catch (IOException ex) {
+				//@TRACE 251=Failed to create TCP tunnel
+				log.fine(CLASS_NAME,methodName,"251",null,ex);
+				throw new MqttException(MqttException.REASON_CODE_HTTP_PROXY_CONNECT_ERROR, ex);
+			}
+
+			try {
+				socket = ((SSLSocketFactory) factory).createSocket(tunnel, host, port, true);
+			} catch (ConnectException ex) {
+				//@TRACE 250=Failed to create TCP socket
+				log.fine(CLASS_NAME,methodName,"250",null,ex);
+				throw new MqttException(MqttException.REASON_CODE_SERVER_CONNECT_ERROR, ex);
+			}
+
+		} else {
+			try {
+				SocketAddress sockaddr = new InetSocketAddress(host, port);
+				socket = factory.createSocket();
+				socket.connect(sockaddr, conTimeout * 1000);
+				socket.setSoTimeout(1000);
+			} catch (ConnectException ex) {
+				//@TRACE 250=Failed to create TCP socket
+				log.fine(CLASS_NAME, methodName, "250", null, ex);
+				throw new MqttException(MqttException.REASON_CODE_SERVER_CONNECT_ERROR, ex);
+			}
+		}
+	}
+
+	/*
+	 * Tell our tunnel where we want to CONNECT, and look for the
+	 * right reply.  Throw IOException if anything goes wrong.
+	 */
+	private void doTunnelHandshake(Socket tunnel, String host, int port, String proxyUser, String proxyPassword)
+			throws IOException {
+		OutputStream out = tunnel.getOutputStream();
+
+		String msg;
+		if(proxyUser != null) {
+			String proxyUserPass = String.format("%s:%s", proxyUser, proxyPassword);
+			msg = "CONNECT " + host + ":" + port + " HTTP/1.1\n"
+					+ "Proxy-Authorization: Basic " + Base64.encode(proxyUserPass) + "\n"
+					+ "User-Agent: Paho MQTT3 Client\n"
+					+ "Proxy-Connection: Keep-Alive"
+					+ "\r\n\r\n";
+		} else {
+			msg = "CONNECT " + host + ":" + port + " HTTP/1.0\n"
+					+ "User-Agent: "
+					+ "User-Agent: Paho MQTT3 Client\n"
+					+ "Proxy-Connection: Keep-Alive"
+					+ "\r\n\r\n";
+		}
+
+		byte b[];
 		try {
-			// @TRACE 252=connect to host {0} port {1} timeout {2}
-			log.fine(CLASS_NAME,methodName, "252", new Object[] {host, Integer.valueOf(port), Long.valueOf(conTimeout*1000)});
-			SocketAddress sockaddr = new InetSocketAddress(host, port);
-			socket = factory.createSocket();
-			socket.connect(sockaddr, conTimeout*1000);
-			socket.setSoTimeout(1000);
+			/*
+			 * We really do want ASCII7 -- the http protocol doesn't change
+			 * with locale.
+			 */
+			b = msg.getBytes("ASCII7");
+		} catch (UnsupportedEncodingException ignored) {
+			/*
+			 * If ASCII7 isn't there, something serious is wrong, but
+			 * Paranoia Is Good (tm)
+			 */
+			b = msg.getBytes();
 		}
-		catch (ConnectException ex) {
-			//@TRACE 250=Failed to create TCP socket
-			log.fine(CLASS_NAME,methodName,"250",null,ex);
-			throw new MqttException(MqttException.REASON_CODE_SERVER_CONNECT_ERROR, ex);
+		out.write(b);
+		out.flush();
+
+		/*
+		 * We need to store the reply so we can create a detailed
+		 * error message to the user.
+		 */
+		byte            reply[] = new byte[200];
+		int             replyLen = 0;
+		int             newlinesSeen = 0;
+		boolean         headerDone = false;     /* Done on first newline */
+
+		InputStream     in = tunnel.getInputStream();
+		boolean         error = false;
+
+		while (newlinesSeen < 2) {
+			int i = in.read();
+			if (i < 0) {
+				throw new IOException("Unexpected EOF from proxy");
+			}
+			if (i == '\n') {
+				headerDone = true;
+				++newlinesSeen;
+			} else if (i != '\r') {
+				newlinesSeen = 0;
+				if (!headerDone && replyLen < reply.length) {
+					reply[replyLen++] = (byte) i;
+				}
+			}
 		}
+
+		/*
+		 * Converting the byte array to a string is slightly wasteful
+		 * in the case where the connection was successful, but it's
+		 * insignificant compared to the network overhead.
+		 */
+		String replyStr;
+		try {
+			replyStr = new String(reply, 0, replyLen, "ASCII7");
+		} catch (UnsupportedEncodingException ignored) {
+			replyStr = new String(reply, 0, replyLen);
+		}
+
+		/* We asked for HTTP/1.0, so we should get that back */
+//		if (!replyStr.startsWith("HTTP/1.0 200")) {
+		if(replyStr.indexOf("200") == -1) {
+			throw new IOException("Unable to tunnel through "
+					+ tunnel.getInetAddress().getHostName() + ":" + tunnel.getPort()
+					+ ".  Proxy returns \"" + replyStr + "\"");
+		}
+
+		/* tunneling Handshake was successful! */
 	}
 
 	public InputStream getInputStream() throws IOException {
@@ -110,4 +238,33 @@ public void setConnectTimeout(int timeout) {
 	public String getServerURI() {
 		return "tcp://" + host + ":" + port;
 	}
-}
+
+	public void setHttpProxyHost(String httpProxyHost) {
+		this.httpProxyHost = httpProxyHost;
+	}
+
+	public void setHttpProxyPort(int httpProxyPort) {
+		this.httpProxyPort = httpProxyPort;
+	}
+
+	public void setHttpProxyUser(String httpProxyUser) {
+		this.httpProxyUser = httpProxyUser;
+	}
+
+	public void setHttpProxyPassword(String httpProxyPassword) {
+		this.httpProxyPassword = httpProxyPassword;
+	}
+
+	public void configHttpProxy(String proxyHost, int proxyPort, String user, String password) {
+		if(proxyHost != null && proxyHost.length() > 0 &&
+				proxyPort > 0){
+			setHttpProxyHost(proxyHost);
+			setHttpProxyPort(proxyPort);
+			if(user != null && user.length() > 0 &&
+					password != null && password.length() > 0) {
+				setHttpProxyUser(user);
+				setHttpProxyPassword(password);
+			}
+		}
+	}
+}

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/TCPNetworkModuleFactory.java

@@ -58,6 +58,9 @@ public NetworkModule createNetworkModule(URI brokerUri, MqttConnectOptions optio
 		}
 		TCPNetworkModule networkModule = new TCPNetworkModule(factory, host, port, clientId);
 		networkModule.setConnectTimeout(options.getConnectionTimeout());
+
+		networkModule.configHttpProxy(options.getHttpProxyHost(), options.getHttpProxyPort(),
+				options.getHttpProxyUser(), options.getHttpProxyPassword());
 		return networkModule;
 	}
-}
+}

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/websocket/WebSocketNetworkModuleFactory.java

@@ -54,6 +54,9 @@ public NetworkModule createNetworkModule(URI brokerUri, MqttConnectOptions optio
 		WebSocketNetworkModule netModule = new WebSocketNetworkModule(factory, brokerUri.toString(), host, port,
 				clientId, options.getCustomWebSocketHeaders(), options.isSkipPortDuringHandshake());
 		netModule.setConnectTimeout(options.getConnectionTimeout());
+
+		netModule.configHttpProxy(options.getHttpProxyHost(), options.getHttpProxyPort(),
+				options.getHttpProxyUser(), options.getHttpProxyPassword());
 		return netModule;
 	}
 }

org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/websocket/WebSocketSecureNetworkModuleFactory.java

@@ -75,6 +75,10 @@ public NetworkModule createNetworkModule(URI brokerUri, MqttConnectOptions optio
 				((SSLNetworkModule) netModule).setEnabledCiphers(enabledCiphers);
 			}
 		}
+
+		netModule.configHttpProxy(options.getHttpProxyHost(), options.getHttpProxyPort(),
+				options.getHttpProxyUser(), options.getHttpProxyPassword());
+
 		return netModule;
 	}
 }

org.eclipse.paho.client.mqttv3/src/main/resources/org/eclipse/paho/client/mqttv3/internal/nls/logcat.properties

@@ -37,6 +37,7 @@
 223=failed: in closed state
 224=failed: not disconnected
 250=Failed to create TCP socket
+251=Failed to create TCP tunnel
 252=connect to host {0} port {1} timeout {2}
 260=setEnabledCiphers ciphers={0}
 300=key={0} message={1}

org.eclipse.paho.client.mqttv3/src/main/resources/org/eclipse/paho/client/mqttv3/internal/nls/messages.properties

@@ -36,3 +36,4 @@
 32200=Persistence already in use
 32201=Token already in use
 32202=Too many publishes in progress
+32203=Unable to connect to Http Proxy