Feature v4: Anonymous Login Disabled Issue

[alexbeattie42]

Reproduction

• Disable anonymous login for the application in the firebase console
• Put in auth keys and domain
• Build and runAuth.WPF.Sample project

Problem

If the user is null (it will be on load) the following line MainWindow.xaml.cs will try to authentication anonymously:

await FirebaseUI.Instance.Client.SignInAnonymouslyAsync();

This produces a 400 error to firebase since this form of authentication is disabled for the application. As a result the application screen is blank (white) and the following is printed to the debug output:

Exception thrown: 'System.Net.Http.HttpRequestException' in System.Net.Http.dll
Exception thrown: 'Firebase.Auth.FirebaseAuthHttpException' in Firebase.Auth.dll
Exception thrown: 'Firebase.Auth.FirebaseAuthHttpException' in System.Private.CoreLib.dll
Exception thrown: 'Firebase.Auth.FirebaseAuthHttpException' in System.Private.CoreLib.dll

These exceptions are not surfacing the underlying failure (although it appears they should based on code in Auth.FirebaseAuthHttpException). Maybe this is a problem of DLLs not surfacing out exception messages?

Expected Behavior

• When there is an exception the exception message is output to the debug console
• Anonymous login is not set as the default in the example application or this behavior is specified in the README

Patch

Comment or remove the following line in MainWindow.xaml.cs and refactor appropriately:

await FirebaseUI.Instance.Client.SignInAnonymouslyAsync();