feat: Report email with LTI exercise path

To act on spam reports the teacher needs to sign in through the
exercise path of the LTI consumer to authenticate as a teacher for
the exercise.

Author: arkirchner

app/mailers/report_mailer.rb

@@ -1,10 +1,12 @@
 # frozen_string_literal: true
 
 class ReportMailer < ApplicationMailer
-  default to: CodeOcean::Config.new(:code_ocean).read.dig(:content_moderation, :report_emails)
+  SETTINGS = CodeOcean::Config.new(:code_ocean).read.fetch(:content_moderation, {})
+  default to: SETTINGS[:report_emails]
 
   def report_content
     @reported_content = params.fetch(:reported_content)
+    @exercise_url = "#{SETTINGS[:exercises_base_url]}/#{@reported_content.exercise.uuid}"
 
     mail(subject: I18n.t('report_mailer.report_content.subject', content_name: @reported_content.model_name.human))
   end

app/views/report_mailer/report_content.html.slim

@@ -2,3 +2,5 @@ h3 = t('.prolog')
 blockquote style="white-space: pre-wrap;" = @reported_content.question
 p = t('.take_action')
 p = link_to(request_for_comment_url(@reported_content), request_for_comment_url(@reported_content))
+- if @exercise_url.present?
+  p = link_to(t('.authentication'), @exercise_url)

app/views/report_mailer/report_content.text.slim

@@ -5,3 +5,7 @@
 == t('.take_action')
 == "\n\n"
 == request_for_comment_url(@reported_content)
+== "\n\n"
+- if @exercise_url.present?
+  == t('.authentication')
+  == @exercise_url

config/code_ocean.yml.example

@@ -69,6 +69,7 @@ development:
   codeharbor:
     enabled: true
   content_moderation:
+    exercises_base_url: 'https://example.com/exercises/'
     report_emails:
       - [email protected]
 

config/locales/de/report.yml

@@ -5,3 +5,4 @@ de:
       prolog: 'Die folgenden Inhalte wurden als unangemessen gemeldet:'
       subject: 'Spam Report: Ein %{content_name} in CodeOcean wurde als unangemessen markiert.'
       take_action: Bitte ergreifen Sie gegebenenfalls Maßnahmen.
+      authentication: Übungs-URL für die LTI-Authentifizierung.

config/locales/en/report.yml

@@ -5,3 +5,4 @@ en:
       prolog: 'The following content has been reported as inappropriate:'
       subject: 'Spam Report: A %{content_name} on CodeOcean has been marked as inappropriate.'
       take_action: Please take action if required.
+      authentication: Exercise URL for LTI authentication.

spec/mailers/report_mailer_spec.rb

@@ -7,6 +7,7 @@
     subject(:mail) { described_class.with(reported_content:).report_content }
 
     context 'when an RfC is reported' do
+      let(:exercise) { reported_content.exercise }
       let(:question) { 'Inappropriate content for RfC.' }
       let(:reported_content) { create(:rfc, question:) }
 
@@ -22,6 +23,12 @@
         expect(mail.text_part.body).to include(question)
         expect(mail.html_part.body).to include(question)
       end
+
+      it 'includes the exersice url for the LTI consumer' do
+        stub_const('ReportMailer::SETTINGS', {exercises_base_url: 'https://a.com/exersices/'})
+        expect(mail.text_part.body).to include("https://a.com/exersices/#{exercise.uuid}")
+        expect(mail.html_part.body).to include("https://a.com/exersices/#{exercise.uuid}")
+      end
     end
   end
 end