QTIWorks LTI request parameter is empty

Question

I'm trying to implement LTI in our education platform to connect with QTIWoks in Java.

I have a simple tool consumer that generates the following HTML Form:

then it calls the dominlaunch from qtiworks

@RequestMapping(value="/domainlaunch", method=RequestMethod.POST)
    public String ltiDomainLevelLaunch(final HttpSession httpSession, final HttpServletRequest request,
            final HttpServletResponse response)
            throws IOException {
        /* Decode LTI launch request, and bail out on error */
        final DecodedLtiLaunch decodedLtiLaunch = ltiLaunchService.decodeLtiLaunchData(request, LtiLaunchType.DOMAIN);
        if (decodedLtiLaunch.isError()) {
            response.sendError(decodedLtiLaunch.getErrorCode(), decodedLtiLaunch.getErrorMessage());
            return null;
        }
        final LtiLaunchData ltiLaunchData = decodedLtiLaunch.getLtiLaunchData();

        /* Make sure this is a domain launch */
        final LtiUser ltiUser = decodedLtiLaunch.getLtiUser();
        final LtiDomain ltiDomain = ltiUser.getLtiDomain();
        if (ltiDomain==null) {
            response.sendError(HttpServletResponse.SC_BAD_REQUEST, "The tool consumer has attempted a domain-level launch using a link-level key");
            return null;
        }

        /* Extract/create the corresponding LtiResource for this launch */
        final LtiResource ltiResource = ltiLaunchService.provideLtiResource(decodedLtiLaunch); /* (May be null for candidates) */
        final UserRole userRole = ltiUser.getUserRole();

        if (userRole==UserRole.INSTRUCTOR) {
            /* If user is an instructor, we'll forward to the LTI instructor MVC after
             * "authenticating" the user by creating and storing an LtiDomainTicket
             * in the session */
            final LtiAuthenticationTicket ltiDomainTicket = new LtiAuthenticationTicket(ltiUser.getId(), ltiResource.getId(),ltiLaunchData.getLaunchPresentationReturnUrl());
            LtiResourceAuthenticationFilter.authenticateUserForResource(httpSession, ltiDomainTicket);
            return "redirect:/lti/resource/" + ltiResource.getId();
        }
        else if (userRole==UserRole.CANDIDATE) {
            /* If user is a candidate, then we'll launch/reuse a candidate session */
            if (ltiResource==null) {
                return "candidateLaunchError";
            }

            /* Extract relevant data */
            final String returnUrl = ltiLaunchData.getLaunchPresentationReturnUrl();
            final String lisOutcomeServiceUrl = ltiLaunchData.getLisOutcomeServiceUrl();
            final String lisResultSourcedid = ltiLaunchData.getLisResultSourcedid();

            /* Launch and redirect to session */
            try {
                final CandidateSessionTicket candidateSessionTicket = candidateSessionLaunchService.launchDomainLevelLtiCandidateSession(httpSession,
                        ltiUser, ltiResource, returnUrl, lisOutcomeServiceUrl, lisResultSourcedid);
                return GlobalRouter.buildSessionStartRedirect(candidateSessionTicket);
            }
            catch (final CandidateException e) {
                return "candidateLaunchError";
            }
        }
        else {
            throw new QtiWorksLogicException("Unexpected LTI userRole " + userRole);
        }
    }

the problem is decodedLtiLaunch.isError() returns true and my request is not performed.

I debugged the problem and found that HttpServletRequest request has no item in parameterMap

however, it's working well when the request comes from moodle (request's parameterMap has the passed params)

how can I solve this please?

thanks in advance.

QTIWorks LTI request parameter is empty

Answers (1)

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