Authentication flow logic is delegated to a dedicated module.

AuthViewModel.kt

class AuthViewModel(val authenticator: Authenticator, val context: Context) {
   var providers = Arrays.asList(
           AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build(),
           AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER).build())

   fun getActionIntent(): Intent {
       return if (authenticator.isAuthenticated()) {
           Intent(context, NewContentActivity::class.java)
       } else {
           AuthUI.getInstance()
                   .createSignInIntentBuilder()
                   .setAvailableProviders(providers)
                   .build()
       }
   }
}