Score API

[EklavyaAGARWAL]

Hello.

I'm trying to send the grade and a file back from LTI 1.3 to canvas. The grade is successfully being updated but the file isn't being shown. There is no file attachment and its "No preview available" in the speedgrader for teacher. 

I'm using ltijs library..please check the code- it's "/grade" demo endpoint which sends score to canvas..

// Grading route

router.post('/grade', async (req, res) => {

try {

const idtoken = res.locals.token // IdToken

const score = req.body.grade // User numeric score sent in the body

// Creating Grade object

const gradeObj = {

userId: idtoken.user,

scoreGiven: score,

scoreMaximum: 100,

activityProgress: 'Completed',

gradingProgress: 'FullyGraded',

'https://canvas.instructure.com/lti/submission[content_items]': [

{

"type": "file",

"url": "https://portland-my.sharepoint.com/:b:/g/personal/eagarwal2-c_my_cityu_edu_hk/EVxBtqL4iNVDsIr_lBQAGI...",

"title": "Submission File",

"media_type": "application/pdf"

}

]

}

// Selecting linetItem ID

let lineItemId = idtoken.platformContext.endpoint.lineitem // Attempting to retrieve it from idtoken

if (!lineItemId) {

console.log("inside if");

const response = await lti.Grade.getLineItems(idtoken, { resourceLinkId: true })

// console.log(response);

const lineItems = response.lineItems

if (lineItems.length === 0) {

// Creating line item if there is none

console.log('Creating new line item')

const newLineItem = {

scoreMaximum: 100,

label: 'Grade',

tag: 'grade',

resourceLinkId: idtoken.platformContext.resource.id,

}

console.log("lineItem");

const lineItem = await lti.Grade.createLineItem(idtoken, newLineItem)

console.log(lineItem);

// const lineItem = await lti.Grade.createLineItem(idtoken, newLineItem)

console.log("after creting lineItem");

lineItemId = lineItem.id

} else lineItemId = lineItems[0].id

}

console.log("before sending grade");

// Sending Grade

const responseGrade = await lti.Grade.submitScore(idtoken, lineItemId, gradeObj)

return res.send(responseGrade)

} catch (err) {

console.log(err.message)

return res.status(500).send({ err: err.message })

}

})

[DecoyLex]

Hi @EklavyaAGARWAL,

It looks like the problem is in gradeObj. You've set the field name as https://canvas.instructure.com/lti/submission[content_items], though if I'm reading the examples in the AGS documentation correctly, content_items should be embedded in the https://canvas.instructure.com/lti/submission property:

const gradeObj = {
    "userId": idtoken.user,
    "scoreGiven": score,
    "scoreMaximum": 100,
    "activityProgress": 'Completed',
    "gradingProgress": 'FullyGraded',
    'https://canvas.instructure.com/lti/submission': {
        "content_items": [
            {
                "type": "file",
                "url": "https://portland-my.sharepoint.com/:b:/g/personal/eagarwal2-c_my_cityu_edu_hk/EVxBtqL4iNVDsIr_lBQAGI...",
                "title": "Submission File",
                "media_type": "application/pdf"
            }
        ]
    }
}

I hope this helps!

[EklavyaAGARWAL]

Thanks for your reply. I did that change and still it doesn't send the file back to the canvas production server.

Here is my simple code - server.zip

I'd be grateful if you could look into this!

Is there any other way to attach pdf to a student's submission without using the score API?

[EklavyaAGARWAL]

I fixed it. Seems like the location where the pdf was uploaded required some permissions. I used this https://www.lionkingeducation.co.uk/pdfs/Synopsis.pdf and it worked.