How do I secure my Google Cloud Endpoints APIs with Firebase token verification?

Question

My setup:

• Java backend hosted on Google App Engine containing APIs that were created using Google Cloud Endpoints
• Mobile client applications containin

Answer 1

As this authentication task is running asynchronously in task queue, you can wait until that task is ended and continue in synchronous way, optionally you can add listeners onSuccess, onFailure and onComplete.

Task<FirebaseToken> authTask = FirebaseAuth.getInstance().verifyIdToken(idToken)
.addOnSuccessListener(new OnSuccessListener() {
        @Override
        public void onSuccess(Object tr) {//do smtg }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(Exception excptn) {//do smtg }
    }).addOnCompleteListener(new OnCompleteListener() {
        @Override
        public void onComplete(Task task) {//do smtg }
    });
    try {
        Tasks.await(authTask);
    } catch(ExecutionException | InterruptedException e ){
        //handle error
    }
    FirebaseToken decodedToken = authTask.getResult();