Add direct download of proforma zip

app/controllers/exercises_controller.rb

@@ -12,7 +12,7 @@
   before_action :set_exercise_and_authorize,
     only: MEMBER_ACTIONS + %i[clone implement working_times intervention statistics reload feedback
                               study_group_dashboard export_external_check export_external_confirm
-                              external_user_statistics]
+                              external_user_statistics download_proforma]
   before_action :collect_set_and_unset_exercise_tags, only: MEMBER_ACTIONS
   before_action :set_external_user_and_authorize, only: [:external_user_statistics]
   before_action :set_file_types, only: %i[create edit new update]
@@ -181,6 +181,13 @@
     render json: t('exercises.import_codeharbor.import_errors.internal_error'), status: :internal_server_error
   end
 
+  def download_proforma
+    zip_file = ProformaService::ExportTask.call(exercise: @exercise)
+    send_data(zip_file.string, type: 'application/zip', filename: "exercise_#{@exercise.id}.zip", disposition: 'attachment')
+  rescue ProformaXML::PostGenerateValidationError => e
+    redirect_to :root, danger: JSON.parse(e.message).join('<br>')
+  end
+
   def user_from_api_key
     authorization_header = request.headers['Authorization']
     api_key = authorization_header&.split&.second

app/policies/exercise_policy.rb

@@ -5,7 +5,7 @@ def batch_update?
     admin?
   end
 
-  %i[show? feedback? statistics? external_user_statistics? rfcs_for_exercise?].each do |action|
+  %i[show? feedback? statistics? external_user_statistics? rfcs_for_exercise? download_proforma?].each do |action|
     define_method(action) { admin? || teacher_in_study_group? || (teacher? && @record.public?) || author? }
   end
 

app/views/exercises/index.html.slim

@@ -54,6 +54,7 @@ h1 = Exercise.model_name.human(count: :other)
                 li = link_to(t('shared.destroy'), exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete, class: 'dropdown-item') if policy(exercise).destroy?
                 li = link_to(t('.clone'), clone_exercise_path(exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post, class: 'dropdown-item') if policy(exercise).clone?
                 li = link_to(t('exercises.export_codeharbor.label'), '', class: 'dropdown-item export-start', data: {'exercise-id': exercise.id}) if policy(exercise).export_external_confirm?
+                li = link_to(t('exercises.download_proforma.label'), download_proforma_exercise_path(exercise), class: 'dropdown-item', target: '_blank', rel: 'noopener noreferrer') if policy(exercise).download_proforma?
 
 = render('shared/pagination', collection: @exercises)
 p = render('shared/new_button', model: Exercise)

app/views/exercises/show.html.slim

@@ -23,6 +23,7 @@ h1.d-inline-block
     li = link_to(t('shared.destroy'), @exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete, class: 'dropdown-item') if policy(@exercise).destroy?
     li = link_to(t('exercises.index.clone'), clone_exercise_path(@exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post, class: 'dropdown-item') if policy(@exercise).clone?
     li = link_to(t('exercises.export_codeharbor.label'), '', class: 'dropdown-item export-start', data: {'exercise-id': @exercise.id}) if policy(@exercise).export_external_confirm?
+    li = link_to(t('exercises.download_proforma.label'), download_proforma_exercise_path(@exercise), class: 'dropdown-item', target: '_blank', rel: 'noopener noreferrer') if policy(@exercise).download_proforma?
 
 = row(label: 'exercise.title', value: @exercise.title)
 = row(label: 'exercise.internal_title', value: @exercise.internal_title)

config/locales/de/exercise.yml

@@ -37,6 +37,8 @@ de:
     download_file_tree:
       file_root: Erstellte Dateien
       gone: Die angeforderte Datei konnte nicht abgerufen werden. Erstellte Dateien werden nur kurzzeitig vorgehalten und dann gelöscht. Bitte führen Sie den Code erneut aus und versuchen Sie dann wieder den Download der Datei.
+    download_proforma:
+      label: Download Proforma Zip
     editor:
       collapse_action_sidebar: Aktions-Leiste Einklappen
       collapse_output_sidebar: Ausgabe-Leiste Einklappen

config/locales/en/exercise.yml

@@ -37,6 +37,8 @@ en:
     download_file_tree:
       file_root: Generated Files
       gone: The requested file could not be retrieved. Generated files are only held for a short time and are then deleted. Please run the code again and then try downloading the file a second time.
+    download_proforma:
+      label: Download Proforma Zip
     editor:
       collapse_action_sidebar: Collapse Action Sidebar
       collapse_output_sidebar: Collapse Output Sidebar

config/routes.rb

@@ -91,6 +91,7 @@
       get 'study_group_dashboard/:study_group_id', to: 'exercises#study_group_dashboard'
       post :export_external_check
       post :export_external_confirm
+      get :download_proforma
     end
 
     resources :programming_groups

spec/controllers/exercises_controller_spec.rb

@@ -518,4 +518,34 @@
       end
     end
   end
+
+  describe 'GET #download_proforma' do
+    subject(:get_request) { get :download_proforma, params: {id: exercise.id} }
+
+    let(:zip) { instance_double(StringIO, string: 'dummy') }
+
+    before do
+      allow(ProformaService::ExportTask).to receive(:call).with(exercise:).and_return(zip)
+    end
+
+    it 'calls the ExportTask service' do
+      get_request
+      expect(ProformaService::ExportTask).to have_received(:call)
+    end
+
+    it 'sends the correct data' do
+      get_request
+      expect(response.body).to eql 'dummy'
+    end
+
+    it 'sets the correct Content-Type header' do
+      get_request
+      expect(response.header['Content-Type']).to eql 'application/zip'
+    end
+
+    it 'sets the correct Content-Disposition header' do
+      get_request
+      expect(response.header['Content-Disposition']).to include "attachment; filename=\"exercise_#{exercise.id}.zip\""
+    end
+  end
 end