UNREGISTERED_PLATFORM" about lti-1.3-canvas-lms

[Liziqiuqiu]

The HTTP 500 server error was an issue of the ltijs library:
Cvmcosta/ltijs#193

[doldsimo]

Hi @Liziqiuqiu,

the error occurs when there is probably something wrong with your configuration.
Have you seen this issue?
If not, you can try the solutions I suggested in this issue.

Specifically, you could check whether the url parameters match. This should be the same as in the ISS value in the config/security.yml file, so it depends on the config form the Canvas Instance.

[Liziqiuqiu]

Hi Simon,
Thank you so much for the suggestion. I updated the URI to 'https://canvas.test.instructure.com/' (for a Instructure-hosted test server), and it works. Your assistance is greatly appreciated.

By the way, I have also encountered another issue. The '/grade' and '/members' endpoints do not work. The code remains the same as in your repo.

I chose the LTI 1.3 advantage services when I registered the developer key and then examined the idtoken.platformContext. I found that I have the necessary scope, 'https://purl.imsglobal.org/spec/lti-ags/scope/lineitem'. However, the const response = await lti.Grade.getLineItems(idtoken, { resourceLinkId: true }) and const lineItem = await lti.Grade.createLineItem(idtoken, newLineItem) calls failed.

Have you encountered similar situations before, or could you please provide some guidance for troubleshooting?

error:
POST /grade 500 Internal Server Error
GET /members 500 Internal Server Error

the platformContext.endpoint info
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'
],

Code of the routes.js

const router = require('express').Router()
const path = require('path')

// Requiring Ltijs
const lti = require('ltijs').Provider

// 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
    console.log(idtoken.platformContext)
    // Creating Grade object
    const gradeObj = {
      userId: idtoken.user,
      scoreGiven: score,
      scoreMaximum: 100,
      activityProgress: 'Completed',
      gradingProgress: 'FullyGraded'
    }

    // 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 })
  }
})

// Names and Roles route
router.get('/members', async (req, res) => {
  try {
    const result = await lti.NamesAndRoles.getMembers(res.locals.token)
    if (result) return res.send(result.members)
    return res.sendStatus(500)
  } catch (err) {
    console.log(err.message)
    return res.status(500).send(err.message)
  }
})

// Deep linking route
router.post('/deeplink', async (req, res) => {
  try {
    const resource = req.body

    const items = {
      type: 'ltiResourceLink',
      title: 'Ltijs Demo',
      custom: {
        name: resource.name,
        value: resource.value
      }
    }

    const form = await lti.DeepLinking.createDeepLinkingForm(res.locals.token, items, { message: 'Successfully Registered' })
    if (form) return res.send(form)
    return res.sendStatus(500)
  } catch (err) {
    console.log(err.message)
    return res.status(500).send(err.message)
  }
})

// Return available deep linking resources
router.get('/resources', async (req, res) => {
  const resources = [
    {
      name: 'Resource1',
      value: 'value1'
    },
    {
      name: 'Resource2',
      value: 'value2'
    },
    {
      name: 'Resource3',
      value: 'value3'
    }
  ]
  return res.send(resources)
})

// Get user and context information
router.get('/info', async (req, res) => {
  const token = res.locals.token

  const context = res.locals.context

  const info = {}
  if (token.userInfo) {
    if (token.userInfo.name) info.name = token.userInfo.name
    if (token.userInfo.email) info.email = token.userInfo.email
  }

  if (context.roles) info.roles = context.roles
  if (context.context) info.context = context.context

  return res.send(info)
})

// Wildcard route to deal with redirecting to React routes
router.get('*', (req, res) => res.sendFile(path.join(__dirname, '../public/index.html')))

module.exports = router

[doldsimo]

@Liziqiuqiu thanks for the hint,
Yes, since this example application is based on ltijs you would have to follow the issue you linked.

I will close the issue.

If you have any other questions, you can create a new issue.

[Liziqiuqiu]

Hi Simon,
This is not an issue, but rather a question I've come across. However, I'm unsure where to seek help. I will remove this if it's not the appropriate place to post this question.

In the readme document, the second step is to set up a Canvas instance. I've followed the Production Start tutorial and can access the instance. However, I'm unable to locate the login page; I don't know how to login into the system; all I can find is the public directory shown below. Could you please provide some guidance?

Thank you so much!!!

Have a wonderful Christmas season ahead!

[doldsimo]

Hi @Liziqiuqiu,

Based on your question, I have created a new issue for a better overview.
We can discuss your question further there.