Add FirebaseUser.idToken with claims to firebase-auth

[rocketraman]

Library	Class	Member	Platforms
user	FirebaseAuth	idToken	Android, iOS

The current version of idToken returns only the token itself. The underlying library does provide access to the claims present in the token via the claims property on both iOS and Android. It would be nice if there was a way to get those claims without having to parse the token again.

Reference documentation for APIs in question:

Android: https://firebase.google.com/docs/reference/android/com/google/firebase/auth/GetTokenResult#getClaims()

iOS: https://firebase.google.com/docs/reference/swift/firebaseauth/api/reference/Classes/AuthTokenResult#claims

Note that both platforms provide some additional convenience properties as well, such as the auth timestamp, expiration timestamp, issued at timestamp, and sign-in provider. Ideally, all of those would be available, but from my perspective the claims are the most important and any other attribute should be obtainable from the claims.

[nbransby]

Could you paste in links to the API you are referring to?

[rocketraman]

Could you paste in links to the API you are referring to?

@nbransby I've updated the original post with the API reference links.