[Building Sakai] Adding data to LTI launch

[Charles Severance]

Chris is right - the trend in LTI is not to add more and more data - just add services.   LTI 2.0 has a way to indicate to a tool at the moment of registration which services are available and a way for the tool to request the LMS to send the service end point for a particular service.

/Chuck

On Feb 19, 2015, at 2:23 PM, Schauer, Christopher R <cschauer at txstate.edu> wrote:

> Hi Bob,
> 
> #1 sounds like a good candidate for a custom lti service. Service requests are handled in basiclti/basiclti-blis/src/java/org/sakaiproject/blti/ServiceServlet.java. You could add a service there that returns the list of sites for the current LTI user. You'd call this service from the lti tool in the same way you'd access the outcomes service or the roster service, but with your new message type. To add a parameter to the launch, take a look at basiclti/basiclti-common/src/java/org/sakaiproject/basiclti/util/SakaiBLTIUtil.java.
> 
>  #2 is this JIRA I think: https://jira.sakaiproject.org/browse/SAK-24185. I made a pull request last week that implements it: https://github.com/sakaiproject/sakai/pull/154. It lets you set a rolemap property for the tool that specifies a mapping from sakai roles to lti roles. For example, we have a tool that uses this for the rolemap: "ta:TeachingAssistant,maintain:Learner/Instructor,access:Member,Guest:Learner/GuestLearner,Site Assistant:Instructor/GuestInstructor,Site Collaborator:Instructor/ExternalInstructor,Grader:TeachingAssistant/Grader".
> 
> -Chris
> 
> On Feb 19, 2015, at 11:31 AM, Robert Long <rlong at unicon.net> wrote:
> 
>> All,
>> 
>> I was wondering how difficult / what the process is for adding dynamic custom data to an LTI tool launch?
>> 
>> For example, when launching this tool, I would need to:
>> 
>> 1. Send a json object with the all of the sites in which the currently logged-in user is a member and their LTI role in each site.
>> 2. Possibly send an additional custom role (other than learner and instructor), depending on certain criteria.
>> 
>> Any pointers on how to make this happen? I know I would need to write some custom code for #1, as nothing exists currently to retrieve this data, but how would I place that data into the launch configuration?
>> 
>> Thanks,
>> Bob
>> 
>> ----
>> Robert Long
>> Software Engineer
>> Technical Account Manager - Sakai
>> Unicon, Inc.
>> 
>> ----
>> M.A., Instructional Technology
>> Saginaw Valley State University
>> 
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