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oloff_b · ‎07-05-2020

We have an lti tool which makes an assignment submission via the Score service (part of Assignment and Grading Services). The submission works fine and the assignment shows up in the student Grades view as "not yet graded", which is correct. The problem is that when I try to access the assignment from the student view, I get an error message saying: "Couldn't find valid settings for this link" I'm not sure why this is because it is the same path used to access the tool resource that works before. The only difference is that there are some additional parameters in the query string. To give you an idea, here is how the Score object that gets submitted to Canvas looks: { "userId": "12345675453", "timestamp": "2020-04-16T18:54:36.736+00:00", "activityProgress": "Submitted", "gradingProgress": "PendingManual", "https://canvas.instructure.com/lti/submission": { "new_submission": true, "submission_type": "basic_lti_launch", "submission_data": "https://mytool.com/lti/assignment?param=biz&otherparam=baz" } } I am using the submission_data URL to ensure that the instructor can see the correct submission in the external tool within SpeedGrader. I'm not sure why Canvas is giving this error, since the https://mytool.com/lti/assignment URL is listed in the tool configuration under Redirect URIs. Also, this URL works fine when a student opens the assignment before they submit it. Am I understanding something incorrectly? Should the "submission_type" be set to something else? Or should "submission_data" be a different URL? One thing is that

oloff_b · ‎07-04-2020

The workaround for this was to simply pass the data in the query string. E.g. { "type": "ltiResourceLink", "title": "Test assignment", "text": "A test assignment", "url": "myResourceLink?assignment_id=1234567", "lineItem": { "scoreMaximum": "10", "label": "Assignment", "resourceId": "1234" }, .... It seems that Canvas will only allow passing variable substitution values as custom data in the launch. This must be configured in the tool settings and cannot be modified by the tool itself in the deep link response.

oloff_b · ‎06-28-2020

I'm having the same issue with the Scores service. Could someone please verify that the problem really is the Test Student. The documentation on this is not very helpful and it seems to be incorrect. Have a look at Score - Canvas LMS REST API Documentation. For the userId property it states: The lti_user_id or the Canvas user_id. Returns a 412 if user not found in Canvas or is not a student. This is clearly not the case, since it actually returns a 422 code, like you said. A 412 would be an invalid response in this case, so it would be good if Instructure could update the documentation.

oloff_b · ‎06-20-2020

Hi everyone, I am trying to pass custom data for a deep linking assignment placement. The custom data is set in the lti deep linking response, as part of the lti resource link item. Then, it needs to be available on the https://purl.imsglobal.org/spec/lti/claim/custom claim in the lti launch request to the tool. Here is an example of what I have in the deep linking response when the assignment gets created: ... "https://purl.imsglobal.org/spec/lti/claim/version": "1.3.0", "https://purl.imsglobal.org/spec/lti-dl/claim/content_items": [ { "type": "ltiResourceLink", "title": "Test assignment", "text": "A test assignment", "url": "somelink...", "lineItem": { "scoreMaximum": "10", "label": "Assignment", "resourceId": "1234" }, "window": { "targetName": "MyTool_1592687225123_1234", "windowFeatures": "menubar=yes,location=yes,status=yes,resizable=yes,scrollbars=no" }, "iframe": { "width": 800, "height": 600 }, "custom": { "assignment_type": "specific_assignment_type", "assignment_id": "1234_5678" } } ] Here is the problem: when I try to access the https://purl.imsglobal.org/spec/lti/claim/custom property in the lti launch request message, it is empty. It seems like my custom data isn't being passed in the launch request. Does anyone know what I am doing wrong? Is this the correct way to pass custom data to the launch or is it supposed to be done differently? I'd really appreciate any help on this.

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