Public bug reported:

Current handling of OAuth tokens in the system is quite poor, especially
in failure cases.

The way webapp authentication works via online-accounts, is a complete
facade. The OAuth tokens are not even used, but instead the cookies are
copied from the account plug-in's web view, and stored under ~/.config/
for the app. This means that when the cookies expire, and you still have
an account configured you end up being presented with a logged out
experience on the web site, depending on what URL is being used, and
what site it is. For example, on Untappd, it has happened several times
where, despite having my account existing and enabled in system
settings, that upon opening Untappd, I have been presented with the page
requiring me to log in. In Twitter, one is simply redirected to a fairly
simplistic page requesting entry of username and password, with no
explanation at all.

Conversely, if for these services, one does go to the site's settings
page, and revokes access for the OAuth token, absolutely nothing
changes. The online accounts UI does not pop up requiring one to log in
again. The app will continue working just fine, until the cookies in
question expire, the webapp's configuration is deleted, or the account
is removed.

Furthermore, in scopes which do use the account, behavior is very
unacceptable when a token is revoked/expired on the server side. For
example, if one opens the YouTube scope, and logs in, everything seems
to be fine. But if one goes to
https://security.google.com/settings/security/permissions for the
account in question, and revokes the token access for Ubuntu to use
YouTube, the result upon refresh of the scope is a blank view. There is
no way to log in again. There are no videos to watch. All that appears
in the scope-registry.log for this situation is the following:

YouTube scope is authenticated
Something weird happened
ERROR: HTTP request timeout

** Affects: canonical-devices-system-image
     Importance: Undecided
         Status: New

** Affects: unity-scope-youtube
     Importance: Undecided
         Status: New

** Affects: ubuntu-system-settings-online-accounts (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: unity-scope-youtube
   Importance: Undecided
       Status: New

** Also affects: canonical-devices-system-image
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1594841

Title:
  Systemic failure in handling of OAuth revocations

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