Can we add a method to OAuth2Credentials that checks if token is almost expired and refreshes if so?

[davidxia]

OAuth2Credentials has methods refresh(). But there's no method to check if the token is close to expiring and refresh if so. I want to do these few lines, but these methods are private.

My use case is that I have a long-lived GoogleCredentials instance. I only want to refresh when I need to to minimize unnecessary overhead in making requests to the backend. There are the methods getRequestMetadata() which will essentially do the check and refresh logic, but this method name and parameter is an awkward fit.

Can we expose a new public method in this class that does this?

public void refreshIfExpired() throws IOException {
  synchronized(lock) {
    if (shouldRefresh()) {
      refresh();
    }
  }
}

[JustinBeckwith]

This is pretty important. We have a good implementation of this in node.js auth library.

[chingor13]

This was added in 0.10.0