Disable availability of feature if not permmited on license

app/models/license.rb

@@ -6,11 +6,13 @@ class License < ActiveRecord::Base
   GEO_FEATURE = 'GitLab_Geo'.freeze
   AUDITOR_USER_FEATURE = 'GitLab_Auditor_User'.freeze
   SERVICE_DESK_FEATURE = 'GitLab_ServiceDesk'.freeze
+  RELATED_ISSUES_FEATURE = 'RelatedIssues'.freeze
 
   FEATURE_CODES = {
     geo: GEO_FEATURE,
     auditor_user: AUDITOR_USER_FEATURE,
     service_desk: SERVICE_DESK_FEATURE,
+    related_issues: RELATED_ISSUES_FEATURE,
     # Features that make sense to Namespace:
     deploy_board: DEPLOY_BOARD_FEATURE,
     file_lock: FILE_LOCK_FEATURE
@@ -22,7 +24,7 @@ class License < ActiveRecord::Base
   EARLY_ADOPTER_PLAN = 'early_adopter'.freeze
 
   EES_FEATURES = [
-    # ..
+    { RELATED_ISSUES_FEATURE => 1 },
   ].freeze
 
   EEP_FEATURES = [

app/policies/ee/project_policy.rb

@@ -22,6 +22,11 @@ module EE
         cannot! :create_note
         cannot! :read_project
       end
+
+      unless License.current&.feature_available?(:related_issues)
+        cannot! :read_issue_link
+        cannot! :admin_issue_link
+      end
     end
   end
 end

spec/controllers/projects/issue_links_controller_spec.rb

@@ -5,6 +5,11 @@ describe Projects::IssueLinksController, type: :controller do
   let(:project) { create(:project_empty_repo) }
   let(:issue) { create :issue, project: project }
 
+  before do
+    allow_any_instance_of(License).to receive(:feature_available?) { false }
+    allow_any_instance_of(License).to receive(:feature_available?).with(:related_issues) { true }
+  end
+
   describe 'GET #index' do
     let(:service) { double(IssueLinks::ListService, execute: service_response) }
     let(:service_response) { [{ 'foo' => 'bar' }] }

spec/services/issue_links/create_service_spec.rb

@@ -11,6 +11,9 @@ describe IssueLinks::CreateService, service: true do
     end
 
     before do
+      allow_any_instance_of(License).to receive(:feature_available?) { false }
+      allow_any_instance_of(License).to receive(:feature_available?).with(:related_issues) { true }
+
       project.team << [user, :developer]
     end
 

spec/services/issue_links/list_service_spec.rb

@@ -7,6 +7,9 @@ describe IssueLinks::ListService, service: true do
   let(:user_role) { :developer }
 
   before do
+    allow_any_instance_of(License).to receive(:feature_available?) { false }
+    allow_any_instance_of(License).to receive(:feature_available?).with(:related_issues) { true }
+
     project.team << [user, user_role]
   end