Develop Reference

How to obtain refresh token in Microsoft Authorization Code flow - java sdk

I am implementing "Login with Microsoft button" and I need to store the refresh token in my database so that I can use that to obtain new access tokens in future. I am trying to do this with Java sdk for microsoft graph.
Edit 1: I actually want to create calendar events using my web application. So, the goal is for the web app to access Graph API without having a signed in user present.
This is what the code looks like:
AuthorizationCode authorizationCode = new AuthorizationCode(httpServletRequest.getParameter("code"));
String currentUri = httpServletRequest.getRequestURL().toString();
IAuthenticationResult result;
ConfidentialClientApplication app;
try {
app = createClientApplication();
String authCode = authorizationCode.getValue();
Set<String> scopes = new HashSet<String>();
scopes.add("Calendars.ReadWrite");
AuthorizationCodeParameters parameters = AuthorizationCodeParameters.builder(authCode, new URI(currentUri)).scopes(scopes)
.build();
Future<IAuthenticationResult> future = app.acquireToken(parameters);
result = future.get();
} catch (ExecutionException e) {
throw e.getCause();
}
String accessToken = result.accessToken();
/*
IAuthenticationResult does not contain any method to get the refresh token - how do I get the refresh token??
I want to do something like: result.refreshToken();
*/
IAuthenticationResult is implemented by AuthenticationResult -- but, AuthenticationResult is declared in another class and is not public. AuthenticationResult exposes a method to obtain refreshToken but, I am not able to access it.
Can someone help me access the refresh token?
Thanks!

I got the answer from this link: https://github.com/AzureAD/microsoft-authentication-library-for-java/issues/228
Short Answer: Use reflection
try {
//see com.microsoft.aad.msal4j.AuthenticationResult#refreshToken
final Field refreshTokenField = result.getClass()
.getDeclaredField("refreshToken");
refreshTokenField.setAccessible(true);
return refreshTokenField.get(result).toString();
} catch (IllegalAccessException | NoSuchFieldException e) {
throw new RuntimeException(e);
}

send message to single device using Firebase cloud with Java

I'm trying to send messages to single devices using their token from a Java application. I'm using the Firebase Admin SDK. Below is what I have
FileInputStream serviceAccount = null;
try {
serviceAccount = new FileInputStream("google-services.json");
} catch (FileNotFoundException e2) {
e2.printStackTrace();
}
FirebaseOptions options = null;
try {
options = new FirebaseOptions.Builder()
.setCredentials(GoogleCredentials.fromStream(serviceAccount))
.setDatabaseUrl("https://MYPROJECTID.firebaseio.com/")
.build();
} catch (IOException e1) {
e1.printStackTrace();
}
FirebaseApp.initializeApp(options);
String registrationToken = "MYDEVICETOKEN";
// See documentation on defining a message payload.
Message message = Message.builder().putData("time", "2:45").setToken(registrationToken)
.build();
// Send a message to the device corresponding to the provided
// registration token.
String response = null;
try {
response = FirebaseMessaging.getInstance().sendAsync(message).get();
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
// Response is a message ID string.
System.out.println("Successfully sent message: " + response);
But I get the following exception
java.io.IOException: Error reading credentials from stream, 'type' field not specified.
What am I doing wrong here?

Click on Generate new private key button.

The error means that your google-services.json file contains invalid data. GoogleCredentials class expects your file to have a type property, but it's not there.
Brief googling gave me this post regarding very similar problem. It says:
From the API Manager, just create select "Create credentials" >
"Service Account key" and generate a new key for the Service
that is associated to your Google Play account.

Mailchimp Apache Error

im working with mailchimp, my objetive is to send users to the list in the mailchimp, so i used a wrapper from ecwid this one
So i did a method that send a test user to my list, i added my list id and my Api Key , but i have an error
this is my code
private void mailchimp(){
MailchimpClient client = new MailchimpClient("MY_API_KEY");
try {
EditMemberMethod.CreateOrUpdate method = new EditMemberMethod.CreateOrUpdate("MY_LIST_ID", "vasya.pupkin#gmail.com");
method.status = "subscribed";
method.merge_fields = new MailchimpObject();
method.merge_fields.mapping.put("FNAME", "Vasya");
method.merge_fields.mapping.put("LNAME", "Pupkin");
MemberInfo member = null;
Log.e("mailchimpmember",""+member);
member = client.execute(method);
} catch (IOException e) {
e.printStackTrace();
} catch (MailchimpException e) {
e.printStackTrace();
}
}
The problem is when i reach this method i get this from Apache in my android monitor at line MailchimpClient client = new MailchimpClient("MY_API_KEY");
No virtual method setConnectionManagerShared(Z)Lorg/apache/http/impl/client/HttpClientBuilder; in class Lorg/apache/http/impl/client/HttpClientBuilder; or its super classes (declaration of 'org.apache.http.impl.client.HttpClientBuilder' appears in /data/app/com.myapp.app.debug-1/split_lib_dependencies_apk.apk:classes78.dex)
at com.ecwid.maleorang.connector.HttpClientConnector.(HttpClientConnector.kt:71)
and this one
java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/http/impl/client/HttpClientBuilder;
im really struggling to get mailchimp running in my project, i cant find a good wrapper and dont know how to properly set it up
thanks

Check this video tutorial about posting new members to MailChimp list
https://www.youtube.com/watch?v=TkRUi_vN12k
Or just try using Volley for the http requests

Accessing web API protected by Azure AD using a web app client

Can someone please explain me how to access the protected web api using a web app client?
I am trying something mentioned here in the following link. But I am always getting
The provided access grant is invalid or malformed.
https://msdn.microsoft.com/en-us/library/azure/dn645542.aspx
Here is the code i am using for java
AuthenticationResult result = null;
try {
final Future<AuthenticationResult> resultFuture = context.acquireTokenByAuthorizationCode(
code, new URI(redirectUri), new ClientCredential(clientId, clientSecret), RESOURCE_GRAPH_API, null);
result = resultFuture.get();
} catch (InterruptedException | ExecutionException e) {
LOG.info("Failed to obtain access token: " + e.getMessage());
} catch (URISyntaxException e) {
}

Getting Persistence Already in Use error from MQTT

I am getting the following exception from the mqtt broker when I am trying to create a new MqttClient. The error is here ---
Caused by: Persistence already in use (32200)
at org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence.open(MqttDefaultFilePersistence.java:108) [mqtt-client-0.4.0.jar:]
at org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(MqttAsyncClient.java:273) [mqtt-client-0.4.0.jar:]
at org.eclipse.paho.client.mqttv3.MqttClient.<init>(MqttClient.java:222) [mqtt-client-0.4.0.jar:]
at org.eclipse.paho.client.mqttv3.MqttClient.<init>(MqttClient.java:134) [mqtt-client-0.4.0.jar:]
at com.ericsson.asdp.virtualassist.notification.messaging.MQTTHandler.createClient(MQTTHandler.java:61) [classes:]
at com.ericsson.asdp.virtualassist.notification.messaging.MQTTMessagingService.receieve(MQTTMessagingService.java:52) [classes:]
... 44 more
Here is the code for my java class receive() method from where I am trying to connect to mqtt ---
MqttClient subClient = null;
try {
subClient = mqttHandler.createClient(userId, brokerURL);
MQTTNotificationSubscriber notificationSub = new MQTTNotificationSubscriber(mqttHandler);
notificationSub.setUserId(userId);
subClient.setCallback(notificationSub);
mqttHandler.subscribe(subClient, userId);
// do something here
} catch (Exception e) {
logger.error("Error in receive " + e.getMessage());
throw new VirtualAssistServicesException(e.getMessage(), e);
} finally {
try {
mqttHandler.disconnect(subClient);
} catch (MqttException e) {
throw new VirtualAssistServicesException(e.getMessage(), e);
}
}
And here is the MQTTHandler class createClient() method ---
MqttClient subClient = null;
try {
subClient = new MqttClient(brokerURL, clientId);
} catch (MqttException e) {
}
When I create the client for a userId first time it works. From second time onwards it fails with the above exception. I am using clean-session=false here.
If anyone has any idea please let me know. Thanks.

Looks like both clients are trying to use the same file for persistence.
Javadocs for MqttDefaultFilePersistence.open() says
Initialise the persistent store. If a persistent store exists for this client ID then open it, otherwise create a new one. If the persistent store is already open then just return. An application may use the same client ID to connect to many different servers, so the client ID in conjunction with the connection will uniquely identify the persistence store required.
Throws: MqttPersistenceException - if there was a problem opening the
persistent store.
I suppose the file is already open, you must use a different clientId in your code for each one of your Mqtt clients.

This is because in both client you are using same persistence name.
client = new MqttClient("tcp://192.168.1.100:1883", "One");
In the next thread you are using the same:
client1 = new MqttClient("tcp://192.168.1.100:1883", "One");
The persistence name should be different for each connection you want to make. You have to make change like this in client1:
client = new MqttClient("tcp://192.168.1.100:1883", "Two");