Perform an OAuth authorisation step.
This calls function and then updates the token and token secret in the proxy.
this must not require binding, the function will be invoked using set_function.
| this |
an OAuthProxy |
| function |
the function to invoke on the proxy |
| callback |
the callback to invoke when authorisation is complete |
| weak_object |
the Object to weakly reference and tie the lifecycle too |
| user_data |
data to pass to |