def launch_assignment()

in microservices/classroom_shim/src/routes/launch.py [0:0]

• 91 lines of code
• 24 McCabe index (conditional complexity)

def launch_assignment(lti_assignment_id: Optional[str] = "",
                      timezone: Optional[str] = "",
                      user_details: dict = Depends(validate_token)):
  """This launch assignment will take the input assignment id and
  redirect the user to the appropriate LTI tool content item
  Args:
      lti_assignment_id (str): unique id of the LTI Assignment
  Returns:
      Redirects to the LTI tool launch url
  """
  try:
    # verify user if it exists
    user_email = user_details.get("email")
    user_resp = get_user_details(user_email)
    user_res_data = user_resp.get("data")
    if user_res_data:
      user_data = user_res_data[0]
    else:
      raise UnauthorizedUserError(
          "Access Denied with code 1001, Please contact administrator")

    user_id = user_data.get("user_id")
    lti_assignment = LTIAssignment.find_by_id(lti_assignment_id)
    lti_content_item_id = lti_assignment.lti_content_item_id
    context_id = lti_assignment.context_id

    custom_params = {}
    if lti_assignment.start_date:
      custom_params["$ResourceLink.available.startDateTime"] = (
          lti_assignment.start_date).isoformat()

    if lti_assignment.end_date:
      custom_params["$ResourceLink.available.endDateTime"] = (
          lti_assignment.end_date).isoformat()

    if lti_assignment.due_date:
      custom_params["$ResourceLink.submission.endDateTime"] = (
          lti_assignment.due_date).isoformat()

    if lti_assignment.max_points:
      custom_params["$LineItem.resultValue.max"] = lti_assignment.max_points

    if timezone:
      custom_params["$Person.address.timezone"] = timezone

    if lti_assignment.prev_context_ids:
      context_id_history = ",".join(lti_assignment.prev_context_ids)
      custom_params["$Context.id.history"] = context_id_history

    if lti_assignment.prev_content_item_ids:
      resource_link_id_history = ",".join(lti_assignment.prev_content_item_ids)
      custom_params["$ResourceLink.id.history"] = resource_link_id_history

    url = f"{API_DOMAIN}/classroom-shim/api/v1/launch-assignment?lti_assignment_id={lti_assignment_id}"
    custom_params["$ResourceLink.RelaunchURL"] = url

    if lti_assignment.context_type is None:
      Logger.info(
          f"Request had been failed as the context type is null for {lti_assignment.id}"
      )
      raise Exception(
          "Request failed with code 1010, Please contact administrator")

    final_lti_message_hint_dict = {
        "custom_params_for_substitution": custom_params,
        "context_type": lti_assignment.context_type
    }

    url = f"{API_DOMAIN}/lti/api/v1/resource-launch-init?lti_content_item_id={lti_content_item_id}&user_id={user_id}&context_id={context_id}"
    user_type = user_details.get("user_type")

    if lti_assignment.context_type == "course_template":

      if user_type == "learner":
        raise UnauthorizedUserError(
            "Access Denied with code 1011, Please contact administrator")

      elif user_type in ("faculty", "admin"):
        id_resp_data = get_instruction_designer_details(context_id, user_email)
      else:
        raise UnauthorizedUserError(
            "Access Denied with code 1014, Please contact administrator")

    else:
      if user_type == "learner":
        learner_data = get_student_details(context_id, user_email)

        if learner_data is None:
          raise UnauthorizedUserError(
              "Access Denied with code 1003, Please contact administrator")
        elif learner_data:
          if learner_data.get("enrollment_status") == "invited":
            raise UnauthorizedUserError(
                "Enrollment in progress, please retry again after 45 minutes")

      elif user_type in ("faculty", "admin"):
        faculty_data = get_teacher_details(context_id, user_email)

        if faculty_data is None:
          raise UnauthorizedUserError(
              "Access Denied with code 1005, Please contact administrator")
      else:
        raise UnauthorizedUserError(
            "Access Denied with code 1007, Please contact administrator")

    return {"url": url, "message_hint": final_lti_message_hint_dict}

  except ValidationError as e:
    Logger.error(e)
    raise BadRequest(str(e)) from e
  except UnauthorizedUserError as e:
    Logger.error(e)
    raise Unauthenticated(str(e)) from e
  except ResourceNotFoundException as e:
    Logger.error(e)
    raise ResourceNotFound(str(e)) from e
  except Exception as e:
    Logger.error(e)
    Logger.error(traceback.print_exc())
    raise InternalServerError(str(e)) from e