Add configuration response to FOSS

To unify codebase for Security Configuration page
we need to start responsing with Configuration details
for json request for FOSS Configuration controller

Issue https://gitlab.com/gitlab-org/gitlab/-/issues/339023

app/controllers/projects/security/configuration_controller.rb

@@ -9,6 +9,37 @@ module Projects
 
       def show
         render_403 unless can?(current_user, :read_security_configuration, project)
+
+        respond_to do |format|
+          format.html
+          format.json do
+            render status: :ok, json: configuration.to_h
+          end
+        end
+      end
+
+      private
+
+      def configuration
+        @configuration ||= if unify_configuration_enabled?
+                             configuration_presenter
+                           else
+                             {}
+                           end
+      end
+
+      def configuration_presenter
+        ::Projects::Security::ConfigurationPresenter.new(project,
+                                                         **presenter_attributes,
+                                                         current_user: current_user)
+      end
+
+      def presenter_attributes
+        {}
+      end
+
+      def unify_configuration_enabled?
+        Feature.enabled?(:unify_security_configuration, project, default_enabled: :yaml)
       end
     end
   end

config/feature_flags/development/unify_security_configuration.yml

+---
+name: unify_security_configuration
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76866
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/350177
+milestone: '14.7'
+type: development
+group: group::composition analysis
+default_enabled: false

ee/app/controllers/ee/projects/security/configuration_controller.rb

@@ -32,13 +32,12 @@ module EE
         def show
           return super unless security_dashboard_feature_enabled? && can_read_security_dashboard?
 
-          @configuration = ::Projects::Security::ConfigurationPresenter.new(project,
-                                                                            auto_fix_permission: auto_fix_authorized?,
-                                                                            current_user: current_user)
+          configuration
+
           respond_to do |format|
             format.html
             format.json do
-              render status: :ok, json: @configuration.to_h
+              render status: :ok, json: configuration.to_h
             end
           end
         end
@@ -77,6 +76,11 @@ module EE
           render_404 if ::Feature.disabled?(:security_auto_fix, project)
         end
 
+        override :configuration
+        def configuration
+          @configuration ||= configuration_presenter
+        end
+
         def security_dashboard_feature_enabled?
           vulnerable.feature_available?(:security_dashboard)
         end
@@ -92,6 +96,11 @@ module EE
         def authorize_read_security_dashboard!
           render_403 unless can_read_security_dashboard?
         end
+
+        override :presenter_attributes
+        def presenter_attributes
+          { auto_fix_permission: auto_fix_authorized? }
+        end
       end
     end
   end

spec/controllers/projects/security/configuration_controller_spec.rb

@@ -36,6 +36,31 @@ RSpec.describe Projects::Security::ConfigurationController do
         expect(response).to have_gitlab_http_status(:ok)
         expect(response).to render_template(:show)
       end
+
+      it 'responds with configuration data json' do
+        get :show, params: { namespace_id: project.namespace, project_id: project, format: :json }
+
+        features = json_response['features']
+        sast_feature = features.find { |feature| feature['type'] == 'sast' }
+        dast_feature = features.find { |feature| feature['type'] == 'dast' }
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(sast_feature['available']).to be_truthy
+        expect(dast_feature['available']).to be_falsey
+      end
+
+      context 'with feature flag unify_security_configuration turned off' do
+        before do
+          stub_feature_flags(unify_security_configuration: false)
+        end
+
+        it 'responds with empty configuration data json' do
+          get :show, params: { namespace_id: project.namespace, project_id: project, format: :json }
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(json_response).to be_empty
+        end
+      end
     end
   end
 end