Help Needed: LTI 1.3

Renato.V.657

I'm new to LTI, so I've decided to create a small application to learn more about it. However, every time I make a call to the authenticate end-point, I receive a 404 error.

This is the endpoint I'm calling from the LTI tool.

public IActionResult Login([FromForm] string iss, [FromForm] string login_hint, [FromForm] string client_id, [FromForm] string lti_message_hint)

{

  if (string.IsNullOrEmpty(iss) || string.IsNullOrEmpty(login_hint) || string.IsNullOrEmpty(client_id))

  {

    return BadRequest(new { message = "..." });

  }

  var authEndpoint = "https://{*}.desire2learn.com/d2l/lti/authenticate";


  var redirectUrl =   $"{authEndpoint}" +

                      $"?client_id={client_id}" +

                      $"&redirect_uri=https://ecplus-test.ngrok.io/api/lti/callback" +  

                      $"&response_type=id_token" +

                      $"&prompt = none" +

                      $"&scope=openid" +

                      $"&response_mode=form_post" +

                      $"&nonce=" + Guid.NewGuid().ToString() +

                      $"&login_hint={login_hint}" +

                      $"&lti_message_hint={lti_message_hint}" +

                      $"&state=" + Guid.NewGuid().ToString();


  return Redirect(redirectUrl);
}

Can anyone provide insights into what might be going wrong? Any help would be greatly appreciated.

Thank you!

Sangeetha.T.629

Hi @Renato.V.657 ,

Thanks for reaching us through the community!!

I looked into the application code you added above with the application you created in LTI advantage of Manage extensibility - ECPlus - Tunnel - Renato

I see a few configurations are missing as per the document - https://community.d2l.com/brightspace/kb/articles/23730-about-lti-1-3-launch-and-authentication . Will it be possible for you to raise a support case with all these details along with the documents referred to to create an application?

Your first step is to connect with your school or organization’s Help Desk to create a support request.   

If you’re not sure how to do this, email us at questions@community.d2l.com with the name of your school or organization and we can provide the contact details.    

If you are the ASC/ Admin for your Organization, please refer to our documentation for how to log a Support case or request, and a member of our Support team will be happy to assist you. 

Thanks,

Sangeetha