Working on developing 1.3 LTI Deep Linking. Keep getting errors.

Steven.Davies25

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UPDATE

 

I found out what was originally going wrong, I wasn't sending the KID header along with the token.

 

However I'm still having a problem... Now I get "The external learning tool responded with no content. Close this dialog and try again or contact the external learning tool for support."

 

Am I sending the content item incorrectly?

 

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Hello,

 

I'm trying to achieve deep linking between my tool and Brightspace.

 

The initial request comes in fine, I get the deep_link_return_url from it, select the link i want to use, then attempt to post the data back. This is where i'm having the problem.

 

To start with I got 500 error, did some research and realised I had to put the kid in the header. Once I started sending that I am now getting 403 Not Authorised errors.

 

System logs in brightspace state "Error processing deep linking return"

 

Can anyone see any problems with the below, or is there anyway of getting a more detailed error?

 

Here is the token I am sending (I seralise before I do send):

 

{

  {

   "alg":"RS256",

   "kid":"private-kid",

   "typ":"JWT"

  }"."{

   "iss":"https://pebble.d2l-partners.brightspace.com",

   "aud":"privateaud",

   "exp":1645720195,

   "iat":1645719595,

   "nonce":"618e64fe03376e1f482470cea7e7dff7d54606d1336db09cddcf3b2697af87cd",

   "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/claim/deployment_id":"privatedeploymentid",

   "https://purl.imsglobal.org/spec/lti-dl/claim/data":"3xf3EE1aJaOuAdhyBiaYoWNqRR22OcDRQrDZgc1ipWQ~",

   "https://purl.imsglobal.org/spec/lti-dl/claim/content_item":"[{\"type\":\"ltiResourceLink\",\"title\":\"Testing Template\",\"text\":\"\",\"url\":\"https://testurl.com\"}]",

   "nbf":1645719595

  }

}