External Tool (LTI) LIS Basic Outcomes Service fails

[Dwayne Towell]

We have an LTI tool we are trying to integrate with Canvas, however all the following occurs when the "reference implementation" for LTI available at http://www.imsglobal.org/developers/LTI/test/v1p1/tool.php is used as a tool in Canvas.

Launching works great, however the LIS Basic Outcomes Service fails returning a non-XML for correct replaceResult requests.

Experiments show the following:

• when a bad OAuth consumer key is sent a correctly formed XML response of "Invalid authorization header" is returned
• when an empty grade is sent a correctly formed XML response of imsx_codeMajor = failure is returned
• however when a grade is actually send and the correct consumer key is used, a non-XML error page is returned with the following fields in the HTML error form:

<input id="error_category" name="error[category]" type="hidden" value="500" />
<input id="error_id" name="error[id]" type="hidden" value="14070999" />
<input id="error_url" name="error[url]" type="hidden" value="https://canvas.instructure.com/api/lti/v1/tools/6823/grade_passback" />

This might be a show stopper for us. We really need to know what is going on with outcome reporting for LTI tools. Any clues would be appreciated.

Thanks, Dwayne

[Cody Cutrer]

Dwayne,

If you're referring to assignment
https://canvas.instructure.com/courses/740553/assignments/1918649 it
is erroring out because the assignment doesn't have any points
possible. This should probably be handled better. I'll be sure to file
a ticket.

Cody Cutrer
Software Engineer
Instructure

On Thu, Aug 23, 2012 at 7:49 PM, Dwayne Towell <dwayne...@gmail.com> wrote:
> 14070999

[Dwayne Towell]

Excellent! Thanks for finding that. Yes, a note someplace googleable or a
correct error message would be wonderful.

Dwayne

--

[Christopher Bennell]

I noticed a possibly related problem a while ago: https://github.com/instructure/canvas-lms/issues/178