LTI 1.3 resource_selection not working as expected

[116086425434479]

I have a placement of resource_selection setup but can't seem to get Canvas to use the link. Here are the claims for the initial request.

{
    "https://purl.imsglobal.org/spec/lti/claim/message_type": "LtiResourceLinkRequest",
    "https://purl.imsglobal.org/spec/lti/claim/version": "1.3.0",
    "https://purl.imsglobal.org/spec/lti/claim/resource_link": {
        "id": "4dde05e8ca1973bcca9bffc13e1548820eee93a3",
        "description": null,
        "title": "Spanish",
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "aud": "10000000000001",
    "azp": "10000000000001",
    "https://purl.imsglobal.org/spec/lti/claim/deployment_id": "1:b82229c6e10bcb87beb1f1b287faee560ddc3109",
    "exp": 1676961699,
    "iat": 1676958099,
    "iss": "https://canvas.instructure.com",
    "nonce": "eea019e7-f902-473f-be37-fe8a2cf038b4",
    "sub": "758359d4-8dbe-4b4a-9813-7e99a384e2a6",
    "https://purl.imsglobal.org/spec/lti/claim/target_link_uri": "https://test1.ngrok.io/_lti/content-item-selection",
    "picture": "http://canvas.instructure.com/images/messages/avatar-50.png",
    "email": "teacher1@canvas.com",
    "name": "Teacher 1",
    "given_name": "Teacher",
    "family_name": "1",
    "https://purl.imsglobal.org/spec/lti/claim/lis": {
        "person_sourcedid": null,
        "course_offering_sourcedid": null,
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "https://purl.imsglobal.org/spec/lti/claim/context": {
        "id": "4dde05e8ca1973bcca9bffc13e1548820eee93a3",
        "label": "SP-101",
        "title": "Spanish",
        "type": [
            "http://purl.imsglobal.org/vocab/lis/v2/course#CourseOffering"
        ],
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "https://purl.imsglobal.org/spec/lti/claim/tool_platform": {
        "guid": "GMckBUetXitVS8yJ8IlpfASxAuf705wiV3pkdAeQ:canvas-lms",
        "name": "Formative",
        "version": "cloud",
        "product_family_code": "canvas",
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "https://purl.imsglobal.org/spec/lti/claim/launch_presentation": {
        "document_target": "iframe",
        "return_url": "http://canvas.docker/courses/1/external_content/success/external_tool_dialog",
        "locale": "en-GB",
        "height": 400,
        "width": 800,
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "locale": "en-GB",
    "https://purl.imsglobal.org/spec/lti/claim/roles": [
        "http://purl.imsglobal.org/vocab/lis/v2/institution/person#Instructor",
        "http://purl.imsglobal.org/vocab/lis/v2/membership#Instructor",
        "http://purl.imsglobal.org/vocab/lis/v2/system/person#User"
    ],
    "https://purl.imsglobal.org/spec/lti/claim/custom": {},
    "https://purl.imsglobal.org/spec/lti-ags/claim/endpoint": {
        "scope": [
            "https://purl.imsglobal.org/spec/lti-ags/scope/lineitem",
            "https://purl.imsglobal.org/spec/lti-ags/scope/lineitem.readonly",
            "https://purl.imsglobal.org/spec/lti-ags/scope/result.readonly",
            "https://purl.imsglobal.org/spec/lti-ags/scope/score",
            "https://canvas.instructure.com/lti-ags/progress/scope/show"
        ],
        "lineitems": "http://canvas.docker/api/lti/courses/1/line_items",
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "https://purl.imsglobal.org/spec/lti-nrps/claim/namesroleservice": {
        "context_memberships_url": "http://canvas.docker/api/lti/courses/1/names_and_roles",
        "service_versions": [
            "2.0"
        ],
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "https://purl.imsglobal.org/spec/lti/claim/lti11_legacy_user_id": "86157096483e6b3a50bfedc6bac902c0b20a824f",
    "https://purl.imsglobal.org/spec/lti/claim/lti1p1": {
        "user_id": "86157096483e6b3a50bfedc6bac902c0b20a824f",
        "validation_context": null,
        "errors": {
            "errors": {}
        }
    },
    "errors": {
        "errors": {}
    },
    "https://www.instructure.com/placement": "resource_selection"
}

Here is the signed message, which is posted back to Canvas as "JWT" as a value in hidden form.

{
    "iss": "10000000000001",
    "aud": "https://canvas.instructure.com",
    "nonce": "4f471804-fcf7-480d-8384-e96c02889f7e",
    "https://purl.imsglobal.org/spec/lti/claim/deployment_id": "1:b82229c6e10bcb87beb1f1b287faee560ddc3109",
    "https://purl.imsglobal.org/spec/lti/claim/message_type": "LtiDeepLinkingResponse",
    "https://purl.imsglobal.org/spec/lti/claim/version": "1.3.0",
    "https://purl.imsglobal.org/spec/lti-dl/claim/content_items": [
        {
            "type": "ltiResourceLink",
            "title": "Untitled Formative",
            "url": "https://test1.ngrok.io/formatives/63f3d788b3255db4ce94d83e",
            "lineItem": {
                "label": "Untitled Formative",
                "scoreMaximum": 100
            }
        }
    ]
}

Anyone have any ideas here or able to point me in the right direction?

One thing I'm not really sure about is where to POST this form. I've been using the return_url in the launch presention claim, but I'm not really sure if that's correct. There error I get after the form POST's is "Error: The tool returned an invalid content type "ContentItem"" I included a screenshot of what I see.

[matthew_buckett]

If you want to return items (as you are trying to do) from this placement then you should set the placement in your LTI Developer Key to have a "Select Message Type" or "LtiDeepLinkingRequest" then in the JWT you get as part of the LTI launch there will be a claim for deep linking which includes the URL to POST the signed response back to:

"https://purl.imsglobal.org/spec/lti-dl/claim/deep_linking_settings": {
    "accept_types": [
      "ltiResourceLink"
    ],
    "validation_context": null,
    "accept_multiple": true,
    "accept_presentation_document_targets": [
      "iframe",
      "window"
    ],
    "accept_media_types": "application/vnd.ims.lti.v1.ltilink",
    "auto_create": false,
    "errors": {
      "errors": {}
    },
    "deep_link_return_url": "https://instance.instructure.com/courses/1234/deep_linking_response?data=......."
  }

[116086425434479]

Thanks for the reply. I assumed this was the case but I can't seem to select that message type since it is disabled. Any idea why?

[matthew_buckett]

I don't think that placement (Resource Selection) supports deep linking, you probably want to use the Link Selection placement which does support deep linking if its in modules you are wanting the LTI tool to appear.