[firebase_ui_auth] - exception is only throw one time when using startMFAVerification

[wer-mathurin]

Is there an existing issue for this?

• I have searched the existing issues and found no duplicates.

What plugin is this bug for?

Firebase UI Auth

What platform(s) does this bug affect?

Web

List of dependencies used.

flutter pub deps -s list

Steps to reproduce

if you have this in your actions:

AuthStateChangeAction<MFARequired>((context, state) async {
     try {
        await startMFAVerification(
          resolver: state.resolver,
          context: context,
        );
      } on FirebaseException catch (e) {
        if (!context.mounted) return;
        ScaffoldMessenger.of(context).hideCurrentSnackBar();
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: ErrorText(exception: e),
          ),
        );
      }
}),

The Exception only only catch the first time as you can see it:

If you press a second time on the validation button

The Exception is not raised to the previous catch statement....but print to the console

Expected Behavior

The the error as many time needed.

One you have an error, In was expecting form this helper method to restart:

  provider.sendVerificationCode(
      hint: hint as fba.PhoneMultiFactorInfo,
      multiFactorSession: session,
      action: AuthAction.none,
    );

Otherwise once you have an error, you need to go to the previous page and type correctly the pin.
I'm expecting user to sometime do mistakes when entering the code, so this can be very annoying from an end user perspective.

Actual Behavior

Only trigger one time

Additional Information

No response

[wer-mathurin]

I provided a PR #482 for this.

[wer-mathurin]

Additional information.

@russellwheatley

The problem came from the way the implementation is done, the code validation can only be executed once otherwise you will get an exception that the Completer is already done !!!

The provided #482 resolved that, but not in a clean way :-(

We did it in our codebase a more clean way. I can update the PR accordingly, but need to know if someone will look at it or do something about it.