assignment service

lit_score_submission.rb

class LtiScoreSubmission
  def initialize(assignment: , lis_result_sourced_id:, score: , lis_outcome_service_url: )
    @assignment = assignment
    @lis_result_sourced_id = lis_result_sourced_id
    @score = score
    @lis_outcome_service_url = lis_outcome_service_url
    @oauth_consumer_key = assignment.oauth_consumer_key
    @lti_shared_secret = assignment.lti_shared_secret
  end

  def call
    response = token.post(lis_outcome_service_url, score_body.to_xml, 'Content-Type' => 'application/xml')
    if response.body.match(/\bsuccess\b/)
      puts "score submitted"
      return true
    else
      puts "score submission failed"
      return false
    end
  end

  private

  attr_reader :lis_result_sourced_id, :assignment, :score, :lis_outcome_service_url

  def oauth_token
    consumer = OAuth::Consumer.new(assignment.oauth_consumer_key, assignment.lti_shared_secret)
    OAuth::AccessToken.new(consumer)
  end

  def score_body
    Nokogiri::XML::Builder.new do |xml|
      xml.imsx_POXEnvelopeRequest(xmlns: "http://www.imsglobal.org/lis/oms1p0/pox") do
        xml.imsx_POXHeader do
          xml.imsx_POXRequestHeaderInfo do
            xml.imsx_version "V1.0"
            xml.imsx_messageIdentifier message_identifier
          end
        end
        xml.imsx_POXBody do
          xml.replaceResultRequest do
            xml.resultRecord do
              xml.sourcedGUID do
                xml.sourcedId lis_result_sourced_id
              end
              xml.result do
                xml.resultScore do
                  xml.language "en"
                  xml.textString score
                end
              end
            end
          end
        end
      end
    end
  end

  def message_identifier
    (SecureRandom.random_number(9e7) + 1e7).to_i # generating a 8 digit random number like 12341234
  end
end


# Spec
#
Rspec.describe LtiScoreSubmission do
   it 'Sends request with proper xml structure' do
   end
end