After a user revokes Wisp's authorization in their Google account
settings, Play Services may still hand back the previously-issued
access token from its local cache. The Drive API then 401s and sign-in
fails with no way for the user to recover from inside the app.
Detect the 401, clear the stale token from Play Services' cache via
GoogleAuthUtil.clearToken, and re-call AuthorizationClient.authorize().
With no cached token, authorize() contacts Google's servers, sees the
revoked consent, and returns a resolution PendingIntent — surfacing the
consent dialog so the user can re-grant the drive.appdata scope. Once
they consent, we retry listBackups with the fresh token.
- DriveBackupService throws DriveAuthorizationExpiredException on 401
(instead of a generic IOException) and exposes the stale token so
callers can pass it to clearToken
- GoogleSignInManager.refreshDriveAccessToken(activity, staleToken):
clears via GoogleAuthUtil and re-runs getDriveAccessToken (which
handles the resolution PendingIntent the same way as initial
sign-in)
- GoogleAuthViewModel.listBackupsWithRefresh wraps the initial list
call with a single retry on the expired-auth exception
Barry Deen
b999aebd42