canvas-lms/app/models/lti/lti_assignment_creator.rb

module Lti
  class LtiAssignmentCreator
    SUBMISSION_TYPES_MAP = {
        'online_upload' => 'file',
        'online_url' => 'url',
        'external_tool' => ['url', 'text']
    }

    def initialize(assignment, source_id = nil)
      @assignment = assignment
      @source_id = source_id
    end

    def convert
      lti_assignment = LtiOutbound::LTIAssignment.new
      lti_assignment.id = @assignment.id
      lti_assignment.source_id = @source_id
      lti_assignment.title = @assignment.title
      lti_assignment.points_possible = @assignment.points_possible
      lti_assignment.return_types = -> { @assignment.submission_types_array.map { |type| SUBMISSION_TYPES_MAP[type] }.flatten.compact }
      lti_assignment.allowed_extensions = @assignment.allowed_extensions
      lti_assignment
    end
  end
end