Flutter Exception Error in firebase_auth

Question

Good afternoon, I’m using the firebase_auth plugin: 0.20.0+1 to authenticate user.

When the user matches the login information no error is shown, however when the user is incorrect and an exception is generated, the flutter cannot capture the exception code.

    class UserManager {
  // config FIREBASE
  final FirebaseAuth auth = FirebaseAuth.instance;

  ///
  ////sigin
  Future<void> fazerLogin(
      {Usuario usuario, Function onFail, Function onSuccess}) async {
    // resultado a auteticação
    try {
      final UserCredential result = await auth.signInWithEmailAndPassword(
        email: usuario.email,
        password: usuario.senha,
      );
    } on PlatformException catch (e) {
      onFail(getErrorString(e.code));
    }
  }
}

follows the console information

W/System  ( 8621): Ignoring header X-Firebase-Locale because its value was null.
E/flutter ( 8621): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: [firebase_auth/wrong-password] The password is invalid or the user does not have a password.
E/flutter ( 8621): #0      MethodChannelFirebaseAuth.signInWithEmailAndPassword
package:firebase_auth_platform_interface/…/method_channel/method_channel_firebase_auth.dart:497
E/flutter ( 8621): <asynchronous suspension>

Answer 1

The firebase_auth spear a FirebaseAuthException, as explicit in the documentation:

A Firebaseuthexception Maybe thrown with the following error code:

So you need to capture a FirebaseAuthException and not a PlatformException and treat according to error code.

Ex:

Future<void> logInWithEmailAndPassword({
    @required String email,
    @required String password,
}) async {
  try {
    await _firebaseAuth.signInWithEmailAndPassword(
      email: email,
      password: password,
    );
  } on FirebaseAuthException catch (e, s) {
    _handleFirebaseLoginWithCredentialsException(e, s);
  } on Exception catch (e, s) {
    //Outro problema
  }
}

void _handleFirebaseLoginWithCredentialsException(
    FirebaseAuthException e, StackTrace s) {
  if (e.code == 'user-disabled') {
    //'O usuário informado está desabilitado.'
  } else if (e.code == 'user-not-found') {
    //'O usuário informado não está cadastrado.'
  } else if (e.code == 'invalid-email') {
    //'O domínio do e-mail informado é inválido.'
  } else if (e.code == 'wrong-password') {
    //'A senha informada está incorreta.'
  } else {
    //Outro problema
  }
}