FirebaseAuth JAVA (Spring boot) verify token

Question

Grettings. i'm implementing a Firebase auth for my mobile app with custom existing back-end (Spring Boot). I'm successfully authenticating in facebook by using firebase in mobile app => want to store user info at my back-end's DB (not firebase).

Stuck to debug the token verification error.

Token verification - almost same as in google doc:

   try {
        FirebaseToken decodedToken = Tasks.await(
                FirebaseAuth.getInstance().verifyIdToken(info.getToken()));
    } catch (ExecutionException | InterruptedException | IllegalArgumentException e) {
        logger.error(e.getMessage());
    }

getting an error: java.lang.IllegalArgumentException

and can't find out/debug what is causing it.

related - firebase config:

@Configuration
public class FirebaseConfig {

    private final static Logger logger = LogManager.getLogger(FirebaseConfig.class.getName());

    @Value("classpath:firebase_config.json")
    private Resource firebase_config;

    @PostConstruct
    public void init() throws IOException {

        FileInputStream serviceAccount = new FileInputStream(firebase_config.getFile());

        FirebaseOptions options = new FirebaseOptions.Builder()
                .setCredential(FirebaseCredentials.fromCertificate(serviceAccount))
                .setDatabaseUrl("https://******-81233.firebaseio.com")
                .build();
        FirebaseApp.initializeApp(options);
        logger.info("Firebase init done");
    }
}

UPDATE: added:

FirebaseAuth.getInstance().verifyIdToken(info.getToken()).addOnFailureListener(e -> {
                    System.err.println("Error verifying token: " + e.getMessage());
                });

the error i getting is simply null which isn;t saying anything about it's origin.

Answer 1

Build release APK version. Deploy and try again. The hashes will be different so that it might help.