How to check if logged in user session token is valid?

[cayet...@gmail.com]

I started using back4app a couple of days ago and as I am going over the documentation, I am not able to understand how to use session tokens. I noticed that if a user logs in, it automatically creates a session. My question is, how do I check if the session is valid for the currently logged on user. I currently do not have a log in feature yet, but I am first creating the method that will check to see if a user is logged in. Here is what I currently have:

public class Home extends AppCompatActivity {

    SharedPreferences mPreferences;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        mPreferences = getSharedPreferences("com.example.example", MODE_PRIVATE);

        Parse.initialize(new Parse.Configuration.Builder(this)
                .applicationId("appid")
                .clientKey("clientkey")
                .server("https://parseapi.back4app.com/")
                .build());

        checkFirstRun();

        if (!isUserLoggedIn()) {
            startActivity(new Intent(this, Authentication.class));
            finish();
        } else {
            checkValidSession();
        }
    }

    private void checkFirstRun() {
        if (mPreferences.getBoolean("isFirstRun", true)) {
            mPreferences.edit().putBoolean("isFirstRun", false).apply();
            startActivity(new Intent(this, Introduction.class));
            finish();
        }
    }

    private boolean isUserLoggedIn() {
        ParseUser currentUser = ParseUser.getCurrentUser();
        return currentUser != null;
    }

    private void checkValidSession() {

    }

How can I check if the session is valid using the checkValidSession method?

[casag...@back4app.com]

Hello,

If you try calling the actual section using REST API, like you can check here: http://parseplatform.org/docs/rest/guide/#sessions (also changing the url to https://parseapi.back4app.com/sessions/me), you might get the actual session in order to check if it is valid or not. 

Also with a session toke you may check if it is valid by using this example:

curl -X GET 

-H "X-Parse-Application-Id: application-id-here" 

-H "X-Parse-REST-API-Key: rest-api-key-here" 

-H "X-Parse-Session-Token: session-token-here" 

https://parseapi.back4app.com/sessions/me

If you have any other questions, please contact us here, on the Online Chat or by emailing us on comm...@back4app.com.

Best!

[Alexis L.]

Just to mention that it is even more important to react to session invalidation, and detect such cases when a query/save object returns 'object not found for update....