Fix rubocop errors, add error message for transfer period #2803

app/controllers/epp/domains_controller.rb

@@ -196,6 +196,15 @@ class Epp::DomainsController < EppController
   end
 
   def validate_transfer
+    # period element is disabled for now
+    if params[:parsed_frame].css('period').any?
+      epp_errors << {
+        code: '2307',
+        msg: I18n.t(:unimplemented_object_service),
+        value: { obj: 'period' }
+      }
+    end
+
     requires 'transfer > transfer'
 
     @prefix = 'transfer > transfer >'