Develop Reference

Kerberos and Active Directory - where does the Active Directory Server name get set?

Total Kerberos and Active Directory newb here trying to get a very small sample working.
Found a Java Active Directory JAAS example onLine and here is the code.
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
public class ActiveDirectoryValidator
{
private static final String USERNAME = "FOO";
private static final String PASSWORD = "BAR";
private ActiveDirectoryValidator()
{
}
public boolean validateUser(String userName, String password)
{
try
{
LoginContext lc = null;
ADCallbackHandler ch = new ADCallbackHandler();
ch.setUserId(userName);
ch.setPassword(password);
lc = new LoginContext("JaasConfig", ch);
lc.login();
return true;
}
catch (LoginException le)
{
System.err.println("Authentication failed:");
System.err.println(" " + le.getMessage());
return false;
}
catch (NullPointerException e)
{
System.err.println("Authentication failed:");
System.err.println(" " + e.getMessage());
return false;
}
}
public static void main(String[] args) throws Exception
{
ActiveDirectoryValidator validateUser = new ActiveDirectoryValidator();
if (validateUser.validateUser(USERNAME, PASSWORD))
{
System.out.print("Authentication Successful");
}
else
{
System.out.print("Authentication Failed");
}
}
}
and
import javax.security.auth.callback.*;
import java.io.IOException;
public class ADCallbackHandler implements CallbackHandler
{
private String ADUserId;
private char[] ADPassword;
public void handle(Callback[] callbacks) throws java.io.IOException, UnsupportedCallbackException
{
for (int i = 0; i < callbacks.length; i++)
{
if (callbacks[i] instanceof NameCallback)
{
NameCallback cb = (NameCallback)callbacks[i];
cb.setName(ADUserId);
}
else if (callbacks[i] instanceof PasswordCallback)
{
PasswordCallback cb = (PasswordCallback)callbacks[i];
cb.setPassword(ADPassword);
}
else
{
throw new UnsupportedCallbackException(callbacks[i]);
}
}
}
public void setUserId(String userid)
{
ADUserId = userid;
}
public void setPassword(String password)
{
ADPassword = new char[password.length()];
password.getChars(0, ADPassword.length, ADPassword, 0);
}
}
Where does the Active Directory Server name go?
I would not expect it to be in the jaas.conf file as I have seen other programs set it via the UI interface and the jaas.conf file never changes.
What am I missing?
Is this example showing something totally different?

Moved my test to a Linux machine and ultimately found 2 missing components.
1 - when executing, I needed to include the
-Djava.security.auth.login.config=mylocation/jaas.conf
2 - I needed to edit the following file to include my Active Directory information
/etc/krb5.conf
After making the necessary references and entries, it worked.

Add an Telegram bot on Java to the group chat

I have a working Telegram bot that replies to my private messages. However, when I add it to my test chat and run the app, I get this error: 'Unexpected action from user'. I guess, it's a wrong way to create a bot for group chat, and maybe I shouldn't use TelegramLongPollingBot. Can you please help me to understand, how to create a group chat bot?
The Bot's class:
public class MessageCalculator extends TelegramLongPollingBot {
private PropertiesFileReader propertiesFileReader = new PropertiesFileReader();
private Properties prop;
{
try {
prop = propertiesFileReader.readPropertiesFile("src/main/resources/config.properties");
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
private static final Logger log = LoggerFactory.getLogger(Main.class);
private int messageCount = 0;
#Override
public String getBotUsername() {
return prop.getProperty("telegram.bot.username");
}
#Override
public String getBotToken() {
return prop.getProperty("telegram.bot.token");
}
#Override
public void onUpdateReceived(Update update) {
if (update.hasMessage() && update.getMessage().hasText()) {
String textFromUser = update.getMessage().getText();
Long userId = update.getMessage().getChatId();
String userFirstName = update.getMessage().getFrom().getFirstName();
log.info("[{}, {}] : {}", userId, userFirstName, textFromUser);
messageCount++;
SendMessage sendMessage = SendMessage.builder()
.chatId(userId.toString())
.text("Hello, " + userFirstName + "! Thank you for the message #" + messageCount ": " + textFromUser)
.build();
try {
this.sendApiMethod(sendMessage);
} catch (TelegramApiException e) {
log.error("Sending message error:\t", e);
}
} else {
//And I get this error message:
log.warn("Unexpected action from user");
}
}
}
I expect to create a chat bot that can count messages from each user later.

SubethaSmtp working example

Can you please tell me how to use SubethaSmtp library? I just want to retrieve the mails from my Gmail inbox and display them or one of them in console window.
I studied most of the API doc but I'm not being able to put the pieces together to get the things working.
Can you please tell me about a working example?
I wrote this code to build a grails application. You may find some bad code habits but it's okey for a sample application.
Here is the code in src/groovy folder :
class MessageHandlerFactoryImpl implements MessageHandlerFactory {
#Override
MessageHandler create(MessageContext ctx) {
return new MessageHandlerImpl(ctx)
}
}
class MessageHandlerImpl implements MessageHandler {
MessageContext context
MessageHandlerImpl(MessageContext context) {
this.context = context
}
#Override
void from(String from) {
println "FROM: ${from}"
}
#Override
void recipient(String recipient) {
println "RECIPIENT: ${recipient}"
}
#Override
void data(InputStream data) {
println "DATA"
println "-------------------"
BufferedReader reader = new BufferedReader(new InputStreamReader(data))
StringBuilder builder = new StringBuilder()
String line
while ((line = reader.readLine()) != null) {
builder.append(line + "\n")
}
println builder.toString()
}
#Override
void done() {
println "DONE"
}
}
class SimpleMessageListenerImpl implements SimpleMessageListener {
#Override
boolean accept(String from, String recipient) {
println "accept: ${from} \n>> ${recipient}"
return false
}
#Override
void deliver(String from, String recipient, InputStream data) {
try {
println "deliver: ${from} \n>> ${recipient} \n>>> ${data.read()}"
} catch (TooMuchDataException e) {
println "TooMuchDataException: ${e.message}"
} catch (IOException e) {
println "IOException: ${e.message}"
}
}
}
class UsernamePasswordValidatorImpl implements UsernamePasswordValidator {
#Override
void login(String username, String password) {
try {
println "LOGIN:::::::"
} catch(LoginFailedException e) {
println "LoginFailedException: ${e.message}"
}
}
}
And here is my controller code.
class SubethaController {
SMTPServer server
def index() {
MessageHandlerFactoryImpl factory = new MessageHandlerFactoryImpl()
server = new SMTPServer(factory)
server.hostName = "imap.gmail.com"
server.port = 993
server.authenticationHandlerFactory = new EasyAuthenticationHandlerFactory(new UsernamePasswordValidatorImpl())
server.start()
}
def stop() {
server?.stop()
}
Wiser wiser
def wiser() {
server = new SMTPServer(new SimpleMessageListenerAdapter(new SimpleMessageListenerImpl()))
server.start()
wiser = new Wiser()
wiser.setPort(25001)
wiser.start()
for (WiserMessage message : wiser.getMessages())
{
String eSender = message.getEnvelopeSender()
String eReceiver = message.getEnvelopeReceiver()
println ">>>>>>>message.getMimeMessage ${message.getMimeMessage()}"
}
}
def wiserS() {
wiser?.stop()
}
}
Thanks.

Okey... I found the answer... The code is well written and is working fine. I just didn't know how to send messages to listening smtp server on the port. I just used telnet program and sent emails to the smtp server running on localhost. Now I will create DNS mapping to make it work on the Internet.
Thanks Nicolás for showing your interest.

Performance issue in Restlet

when I try to request a resource from my API via 100 threads at the same time (It's a simple performance test) I get the following server error message:
Unable to run the following server-side task: Handle inbound messages
I already searched the internet but couldn't find any hint how to get rid of it.
Any experience how to handle that error?
Greetingz,
Cooks
Edit:
Client:
public class PerformanceTest extends Thread {
static ClientResource client;
static int recCounter = 0;
public PerformanceTest(){
super();
}
public static void main(String[] args){
client = new ClientResource("http://localhost:8082/api/module/news/1");
ChallengeScheme scheme = ChallengeScheme.HTTP_BASIC;
ChallengeResponse authentication = new ChallengeResponse(scheme, "app+postapp", "");
client.setChallengeResponse(authentication);
for(int i = 0; i < 100; i++){
System.out.println("Starting test: " + i);
new PerformanceTest().start();
}
}
#Override
public void run() {
JsonRepresentation entity;
try {
entity = new JsonRepresentation(client.get());
recCounter++;
System.out.println("(" + getRecCounter() + ") result: " + entity.getJsonObject().toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private synchronized int getRecCounter(){
return recCounter;
}
Server:
This is my Application Class that starts the server:
public class MyApplication extends Application {
private DB db;
public MyApplication() {
db = new DB();
}
public static void main(String[] args) throws Exception {
Component component = new Component();
component.getServers().add(Protocol.HTTP, 8082);
Application application = new MyApplication();
// Attach the application to the component with a defined contextroot
String contextRoot = "/api";
component.getDefaultHost().attach(contextRoot, application);
component.start();
}
public Restlet createInboundRoot() {
router.attach("/module/news", NewsResource.class);
router.attach("/module/news/{itemId}", NewsResource.class);
router.attach("/module/news/item", NewsResource.class);
router.attach("/module/news/item/{itemId}", NewsResource.class);
// Create Verifier
CredentialsVerifier verifier = new CredentialsVerifier(getDB());
// Create a Guard
ChallengeAuthenticator guard = new ChallengeAuthenticator(getContext(), ChallengeScheme.HTTP_BASIC, "app");
guard.setVerifier(verifier);
guard.setNext(router);
return guard;
}
public synchronized DB getDB() {
return this.db;
}
}

Advice needed for android phonegap custom plugin

I have developed an app in phonegap (html5, JQuery, JS) and I want to develop a plugin to print to a BT printer.
I download printer manufacturer's SDK and I imported the appropriate .jar file to my project with all the methods I will need in my project.
I create the below plugin, following an internet tutorial, in order to call from JS the JAVA methods from printer manufacturers SDK.
JS
var HelloPlugin = {
callNativeFunction: function (success, fail, resultType) {
return cordova.exec(success, fail, "com.tricedesigns.HelloPlugin", "nativeAction", [resultType]);
}
};
JAVA
package com.tricedesigns;
import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import com.starmicronics.stario.StarIOPort;
import com.starmicronics.stario.StarIOPortException;
import com.starmicronics.stario.StarPrinterStatus;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.util.Log;
public class HelloPlugin extends Plugin {
public static final String NATIVE_ACTION_STRING="nativeAction";
public static final String SUCCESS_PARAMETER="success";
#Override
public PluginResult execute(String action, JSONArray data, String callbackId) {
if (NATIVE_ACTION_STRING.equals(action)) {
this.ctx.runOnUiThread(new Runnable()
{
public void run()
{
String resultType = null;
StarIOPort port = null;
String message = null;
String portName = "bt:";
String portSettings = "mini";
byte[] texttoprint = new byte[]{0x1b, 0x40, 0x1b,0x74,0x0D,(byte) 0x91,(byte) 0x92,(byte) 0x93,(byte) 0x94,(byte) 0x95,(byte) 0x96,(byte) 0x97,(byte) 0x98,(byte) 0x99,0x0A,0x0A,0x0A,0x0A,0x0A};
try
{
port = StarIOPort.getPort(portName, portSettings, 10000);
try
{
Thread.sleep(500);
}
catch(InterruptedException e) {}
}
catch (StarIOPortException e)
{
Builder dialog = new AlertDialog.Builder((Context)ctx);
dialog.setNegativeButton("Ok", null);
AlertDialog alert = dialog.create();
alert.setTitle("Failure");
alert.setMessage("Failed to connect to printer");
alert.show();
}
finally
{
if(port != null)
{
try
{
StarIOPort.releasePort(port);
} catch (StarIOPortException e) {}
}
}
}
});
}
return null;
}
}
Printer command manual say:
GetPort is what you will be using to “open” the port to the printer. Using one of the valid
inputs for portName and portSettings as mentioned previously before this, you can pass your
connection string into the StarIO class so that it will correctly set its private variables.
//The following would be an actual usage of getPort:
StarIOPort port = null;
try
{
port = StarIOPort.getPort(portName, portSettings, 10000);
}
catch (StarIOPortException e)
{
//There was an error opening the port
}
StarIOPort is a part of StarIO and this will allow you to create a “port” handle. The
above example shows the port being created and set to null then being assigned the actual
port hook on the following line that contains getPort.
Always use a try, catch when using getPort. If the port cannot be opened
because of connection problems, your program will crash unless you use a
try, catch like the above example.
Is the above syntax of plugin correct or is there something i missed?
When I run my app always i receive "Failed to connect to printer" even if the printer is on and connected to my device.

try this:
public PluginResult execute(String action, JSONArray data, String callbackId) {
PluginResult result = null;
if (PRINT_ACTION.equals(action))
{
JSONObject printerStatusJSON = new JSONObject();
try {
Boolean prtStatus = false;
String msg ="Failed to connect to printer";
String portName = "";
ArrayList<PortInfo> dvss = PrinterFunctions.getDevices();//BTPortList = StarIOPort.searchPrinter("BT:");
if (Looper.myLooper() == null) {
Looper.prepare();
}
for(PortInfo dvs : dvss) {
Map<String, String> st = PrinterFunctions.CheckStatus(dvs.getPortName(), "mini");//port = StarIOPort.getPort(portName, portSettings, 1000);
if(st.get("status") == "true") {
prtStatus = true;
portName = st.get("portName");
break;
}
msg = st.get("message");
}
if(!portName.isEmpty()) {
PrinterFunctions.PrintSomething(portName, data);//MiniPrinterFunctions.PrintSampleReceipt(String portName, JSONArray data);
}
printerStatusJSON.put("prtStatus", prtStatus);
printerStatusJSON.put("message", msg);
result = new PluginResult(Status.OK, printerStatusJSON);
}
catch (Exception jsonEx) {
Log.e("YourApplicationName", "Got JSON Exception " + jsonEx.getMessage());
jsonEx.printStackTrace();
result = new PluginResult(Status.JSON_EXCEPTION);
}
}
else {
result = new PluginResult(Status.INVALID_ACTION);
Log.e(TAG, "Invalid action : " + action);
}
return result;
}