Evaluate WebAuthenticationBroker for OAuth

[dkocher]

https://docs.microsoft.com/en-us/uwp/api/Windows.Security.Authentication.Web.WebAuthenticationBroker

[dkocher]

Similar API exists on macOS with ASWebAuthenticationSession

[AliveDevil]

OAuth2AuthorizationService needs work here to support different methods of authentication.

Probabily with fallbacks, if one method doesn't exist (non-supported operating system for WebAuthBroker), on Windows.

Required parts to implement this successfully:

• Service which gets Request Url (HTTPS only), and Redirect Url
• Service returns either Query-String, or extracted Query-String with option to set Exception result
  • And Exception Message

[AliveDevil]

For Windows this needs to happen before 9.0, as there is no way to register the atrocious Google OAuth Scheme in an AppX¹.

Footnotes

1. https://docs.microsoft.com/uwp/schemas/appxpackage/uapmanifestschema/element-uap-protocol ↩

[AliveDevil]

For reference purposes: Screw you, Microsoft. Making WebAuthenticationBroker unavailable for Win32-Desktop apps.
There is WebAccountManager - who knows how that works, and how long that is supported.

Best option - today¹ - is implementing WebView2 in a hosted window.

Footnotes

1. https://github.com/IdentityModel/IdentityModel.OidcClient.Samples ↩

[AliveDevil]

Found workaround, retarget to 9.x