Extract EE-specific lines from issues controller

app/controllers/projects/issues_controller.rb

@@ -9,14 +9,27 @@ class Projects::IssuesController < Projects::ApplicationController
   include IssuesCalendar
   include SpammableActions
 
-  prepend_before_action :authenticate_user!, only: [:new, :export_csv]
+  prepend ::EE::Projects::IssuesController
+
+  def self.authenticate_user_only_actions
+    %i[new]
+  end
+
+  def self.issue_except_actions
+    %i[index calendar new create bulk_update]
+  end
+
+  def self.set_issuables_index_only_actions
+    %i[index calendar]
+  end
+
+  prepend_before_action :authenticate_user!, only: authenticate_user_only_actions
 
-  before_action :whitelist_query_limiting_ee, only: [:update]
   before_action :whitelist_query_limiting, only: [:create, :create_merge_request, :move, :bulk_update]
   before_action :check_issues_available!
-  before_action :issue, except: [:index, :calendar, :new, :create, :bulk_update, :export_csv]
+  before_action :issue, except: issue_except_actions
 
-  before_action :set_issuables_index, only: [:index, :calendar]
+  before_action :set_issuables_index, only: set_issuables_index_only_actions
 
   # Allow write(create) issue
   before_action :authorize_create_issue!, only: [:new, :create]
@@ -27,8 +40,6 @@ class Projects::IssuesController < Projects::ApplicationController
   # Allow create a new branch and empty WIP merge request from current issue
   before_action :authorize_create_merge_request_from!, only: [:create_merge_request]
 
-  prepend ::EE::Projects::IssuesController
-
   respond_to :html
 
   def index
@@ -254,8 +265,4 @@ class Projects::IssuesController < Projects::ApplicationController
     # 3. https://gitlab.com/gitlab-org/gitlab-ce/issues/42426
     Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-ce/issues/42422')
   end
-
-  def whitelist_query_limiting_ee
-    Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-ee/issues/4794')
-  end
 end

ee/app/controllers/ee/projects/issues_controller.rb

+# frozen_string_literal: true
+
 module EE
   module Projects
     module IssuesController
@@ -6,8 +8,26 @@ module EE
       prepended do
         before_action :check_export_issues_available!, only: [:export_csv]
         before_action :check_service_desk_available!, only: [:service_desk]
-        before_action :set_issuables_index, only: [:index, :calendar, :service_desk]
-        skip_before_action :issue, only: [:service_desk]
+        before_action :whitelist_query_limiting_ee, only: [:update]
+      end
+
+      class_methods do
+        extend ::Gitlab::Utils::Override
+
+        override :authenticate_user_only_actions
+        def authenticate_user_only_actions
+          super + %i[export_csv]
+        end
+
+        override :issue_except_actions
+        def issue_except_actions
+          super + %i[export_csv service_desk]
+        end
+
+        override :set_issuables_index_only_actions
+        def set_issuables_index_only_actions
+          super + %i[service_desk]
+        end
       end
 
       def service_desk
@@ -46,6 +66,10 @@ module EE
       def service_desk?
         action_name == 'service_desk'
       end
+
+      def whitelist_query_limiting_ee
+        ::Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-ee/issues/4794')
+      end
     end
   end
 end