Commits on Jul 21, 2021

1. feat: support refresh handler callable on google.oauth2.credentials.C… …

   …redentials
   
   This is an optional parameter that can be set via the constructor.
   It is used to provide the credentials with new tokens and their
   expiration time on `refresh()` call.
   
   ```
   def refresh_handler(request, scopes):
       # Generate a new token for the requested scopes by calling
       # an external process.
       return (
           "ACCESS_TOKEN",
           _helpers.utcnow() + datetime.timedelta(seconds=3600))
   
   creds = google.oauth2.credentials.Credentials(
       scopes=scopes,
       refresh_handler=refresh_handler)
   creds.refresh(request)
   ```
   
   It is useful in the following cases:
   - Useful in general when tokens are obtained by calling some
     external process on demand.
   - Useful in particular for retrieving downscoped tokens from a
     token broker.
   
   This should have no impact on existing behavior. Refresh tokens
   will still have higher priority over refresh handlers.
   
   A getter and setter is exposed to make it easy to set the callable
   on unpickled credentials as the callable cannot be easily serialized.
   
   ```
   unpickled = pickle.loads(pickle.dumps(oauth_creds))
   unpickled.refresh_handler = refresh_handler
   ```

   

   bojeil-google committed Jul 21, 2021
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2. Addresses review comments.

   

   bojeil-google committed Jul 21, 2021
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3. Merge branch 'master' into oauth2_creds_refresh_handler

   

   arithmetic1728 committed Jul 21, 2021
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