Present lm reports from backend instead of fe pipelines section

This end point will be exposed in haml
End point exposed in mr controller

ee/app/controllers/ee/projects/pipelines_controller.rb

@@ -14,10 +14,18 @@ module EE
       end
 
       def licenses
-        if pipeline.expose_license_management_data?
-          render_show
-        else
-          redirect_to pipeline_path(pipeline)
+        report_exists = pipeline.expose_license_management_data?
+
+        respond_to do |format|
+          if report_exists
+            format.html { render_show }
+            format.json do
+              render json: LicenseManagementReportLicenseEntity.licenses_payload(pipeline.license_management_report), status: :ok
+            end
+          else
+            format.html { redirect_to pipeline_path(pipeline) }
+            format.json { head :not_found }
+          end
         end
       end
 

ee/app/serializers/license_management_report_license_entity.rb

@@ -3,4 +3,11 @@
 class LicenseManagementReportLicenseEntity < Grape::Entity
   expose :name
   expose :dependencies, using: LicenseManagementReportDependencyEntity
+  expose :count do |license|
+    license.dependencies.size
+  end
+
+  def self.licenses_payload(report)
+    report.licenses.empty? ? {} : self.represent(report.licenses).as_json
+  end
 end

ee/app/views/projects/pipelines/_tabs_content.html.haml

@@ -7,6 +7,7 @@
 - sast_container_endpoint = pipeline.downloadable_path_for_report_type(:container_scanning)
 - blob_path = project_blob_path(project, pipeline.sha)
 - license_management_settings_path = can?(current_user, :admin_software_license_policy, project) ? license_management_settings_path(project) : nil
+- licenses_api_path = licenses_project_pipeline_path(project, pipeline) if project.feature_available?(:license_management)
 
 - if pipeline.expose_security_dashboard?
   #js-tab-security.build-security.tab-pane
@@ -32,4 +33,5 @@
     #js-licenses-app{ data: { license_head_path: pipeline.downloadable_path_for_report_type(:license_management),
     api_url: license_management_api_url(project),
     license_management_settings_path: license_management_settings_path,
+    licenses_api_path: licenses_api_path,
     can_manage_licenses: can?(current_user, :admin_software_license_policy, project).to_s } }

ee/changelogs/unreleased/12019-move-lm-reports-pipelines-backend.yml

+---
+title: Expose licence management report for pipeline
+merge_request: 14796
+author:
+type: changed

ee/spec/controllers/projects/pipelines_controller_spec.rb

@@ -19,7 +19,6 @@ describe Projects::PipelinesController do
     set(:source_of_source_pipeline) { create_pipeline(source_project) }
     set(:target_pipeline) { create_pipeline(target_project) }
     set(:target_of_target_pipeline) { create_pipeline(target_project) }
-
     before do
       create_link(source_of_source_pipeline, source_pipeline)
       create_link(source_pipeline, root_pipeline)
@@ -253,6 +252,10 @@ describe Projects::PipelinesController do
   end
 
   describe 'GET licenses' do
+    let(:licenses_with_html) {get :licenses, format: :html, params: { namespace_id: project.namespace, project_id: project, id: pipeline }}
+    let(:licenses_with_json) {get :licenses, format: :json, params: { namespace_id: project.namespace, project_id: project, id: pipeline }}
+    let(:payload) { JSON.parse(licenses_with_json.body) }
+
     context 'with a license management artifact' do
       before do
         build = create(:ci_build, pipeline: pipeline)
@@ -262,8 +265,7 @@ describe Projects::PipelinesController do
       context 'with feature enabled' do
         before do
           stub_licensed_features(license_management: true)
-
-          get :licenses, params: { namespace_id: project.namespace, project_id: project, id: pipeline }
+          licenses_with_html
         end
 
         it do
@@ -272,23 +274,43 @@ describe Projects::PipelinesController do
         end
       end
 
+      context 'with feature enabled json' do
+        before do
+          stub_licensed_features(license_management: true)
+        end
+
+        it 'will return license management report in json format' do
+          expect(payload.size).to eq(pipeline.license_management_report.licenses.size)
+          expect(payload.first.keys).to eq(%w(name dependencies count))
+        end
+      end
+
       context 'with feature disabled' do
         before do
-          get :licenses, params: { namespace_id: project.namespace, project_id: project, id: pipeline }
+          licenses_with_html
         end
 
         it do
           expect(response).to redirect_to(pipeline_path(pipeline))
         end
       end
+
+      context 'with feature disabled json' do
+        before do
+          licenses_with_json
+        end
+
+        it 'will not return report' do
+          expect(response).to have_gitlab_http_status(404)
+        end
+      end
     end
 
     context 'without license management artifact' do
       context 'with feature enabled' do
         before do
           stub_licensed_features(license_management: true)
-
-          get :licenses, params: { namespace_id: project.namespace, project_id: project, id: pipeline }
+          licenses_with_html
         end
 
         it do
@@ -296,15 +318,36 @@ describe Projects::PipelinesController do
         end
       end
 
+      context 'with feature enabled json' do
+        before do
+          stub_licensed_features(license_management: true)
+          licenses_with_json
+        end
+
+        it 'will return 404'  do
+          expect(response).to have_gitlab_http_status(404)
+        end
+      end
+
       context 'with feature disabled' do
         before do
-          get :licenses, params: { namespace_id: project.namespace, project_id: project, id: pipeline }
+          licenses_with_html
         end
 
         it do
           expect(response).to redirect_to(pipeline_path(pipeline))
         end
       end
+
+      context 'with feature disabled json' do
+        before do
+          licenses_with_json
+        end
+
+        it 'will return 404' do
+          expect(response).to have_gitlab_http_status(404)
+        end
+      end
     end
   end
 end