How to use Firebase with Spring boot REST Application?

dickyj Published at Dev

dickyj

I have a Spring Boot REST application that depends on the authentication done in Firebase.

On the client side Firebase generates a token whereby in the Spring Boot, I need to verify the UID.

But the code is in a callback mode, so how do I implement the function so that it can finish the task?

@RequestMapping(value = "/api/restCall", method = RequestMethod.POST, 
             consumes = "application/json", produces = "application/json")
public Object restCall(@RequestBody Parameters requestBody) throws Exception {
    String idToken = requestBody.getToken();
    Task<FirebaseToken> task = FirebaseAuth.getInstance().verifyIdToken(idToken)
            .addOnSuccessListener(new OnSuccessListener<FirebaseToken>() {
            @Override
                public void onSuccess(FirebaseToken decodedToken) {
                    String uid = decodedToken.getUid();
                }
            });
    return "???"; // what return here?
}

How do I return after onSuccess? DeferredResult?

dickyj

Here is my own attempt to answer my own question

@RequestMapping(value = "/api/restCall", method = RequestMethod.POST, consumes = "application/json", produces = "application/json")
public Object restCall(@RequestBody Parameters requestBody,@RequestHeader(value = FIREBASETOKEN, required = true) String idToken) throws Exception {

    // idToken comes from the HTTP Header
    FirebaseToken decodedToken = FirebaseAuth.getInstance().verifyIdTokenAsync(idToken).get();
    final String uid = decodedToken.getUid();

    // process the code here
    // once it is done
    return object;

}

You can try below code as well

FirebaseAuth.getInstance().deleteUser(uid);
System.out.println("Successfully deleted user.");

for More deetails URL https://firebase.google.com/docs/auth/admin/manage-users

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edited at2021-03-4

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