On Thu, Apr 30, 2009 at 7:02 PM, Mike Malone <[email protected]> wrote:
>> oauth_callback in 2nd step:
>>
>> - Present and wasn't in 1st step - no verifier requirement if allowed by
>> the server, potential stronger warning (should be deprecated eventually)
...
> So there's a loophole.

A more draconian way would be to never take into consideration the
oauth_callback sent in 2nd step,
allowing as valid only callbacks sent in 1st step, the choice would be
simpler for the SPs.

>From Eran's summary of the proposal there are three ways to close the loop:

(1) Verifier + Callback
(2) Verifier + Manual entry
(3) No verifier + manual 'continue'

The options for the SP would be:

oauth_callback in 1st step:

- Present with value - do (1)
- Present with empty value - do (2)
- Not included in request - do (3)

oauth_callback in 2nd step:

- Present and wasn't in 1st step - do (3) (or give error if deprecated)
- Present in both 1st and 2nd steps - error
- Not included in redirection - do (3)


Luca

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