[Building Sakai] LTI - callbacks

[Charles Severance]

George - Have you found this sample code / test suite:

https://source.sakaiproject.org/svn/basiclti/trunk/basiclti-docs/resources/docs/sakai-api-test/

This is more up-to-date.

And this documentation might help as well:

https://source.sakaiproject.org/svn/basiclti/trunk/basiclti-docs/resources/docs/sakai_basiclti_api.doc

"Token secret" confuses me.  Are you getting an error in the Sakai servlet code?

In general you should never provide nor require the oauth_token - this is two-legged oauth - not three-legged oauth.

I don't know this this helps.

/Chuck

On Nov 8, 2012, at 12:14 PM, George Pipkin wrote:

> Hi -
> 
>    I am evaluating the LTI capabilities within Sakai as they relate to 
> the ability of a provider to
> call back to sakai and obtain things like an Roster in xml form.  I have 
> discovered a good
> deal of code in v2.8 and the current (v2.9?) trunk to support this, and 
> I have been trying to test
> it.  I have gained a basic understanding of how it works.  You have to 
> include a property in sakai.properties
> (basiclti.roster.enabled=true) and check the checkbox for rosters to 
> even get the ID and the url to call
> back in the POST that is sent down by Basic LTI.  I am running v2.8 of 
> sakai.
> 
>    My callback makes it back to the proper place, and I've figured out 
> that I need to send a number of
> things back such as oauth_consumer_key, oauth_nonce, oauth_timestamp, 
> lti_version,
> oauth_signature, oauth_signature_method.  However, I'm getting hung up 
> validating the signature because
> an object called the accessor needs something called the token secret, 
> and that gets set to
> null when OAuthAccessor is created (line 317 of ServiceServlet). And I 
> can't
> figure where or how it's supposed to get populated.
> 
>    I have a few questions -
> 
> 1) Is this even supposed to work in v2.8, or is v2.9 the only thing in 
> which the code actually works, notwithstanding
> the presence of code in v2.8 to support this functionality ?
> 
> 2) Is there something I need to supply in the callback request that 
> causes the token secret to be populated
> properly.  I've been poking around Chuck's code - 
> tool_provider_outcome.php on Google code's IMS area,
> and I assume that is supposed to work, but I don't see it yet.
> 
> 3) Can anybody point me to some example code ? Again, I think Chuck's 
> code on Google might be this, but
> is there anything out there that does exercise any one of these 1.1 
> callbacks that would illuminate my
> investigation.
> 
>                          - George Pipkin
>                             U.Va.
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