From fa2231b27e30129f4719d5a1e4dabe0a7b857341 Mon Sep 17 00:00:00 2001
From: Stas <stanislav@perfectline.co>
Date: Tue, 24 May 2016 16:34:26 +0300
Subject: [PATCH] 114677695-additional_validation_rule

---
 app/models/nameserver.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/app/models/nameserver.rb b/app/models/nameserver.rb
index 729ac6cbf..00a06c95f 100644
--- a/app/models/nameserver.rb
+++ b/app/models/nameserver.rb
@@ -16,6 +16,7 @@ class Nameserver < ActiveRecord::Base
   # rubocop: enable Metrics/LineLength
 
   before_validation :normalize_attributes
+  before_validation :check_puny_symbols
   
   delegate :name, to: :domain, prefix: true
 
@@ -41,6 +42,11 @@ class Nameserver < ActiveRecord::Base
     self.ipv6 = Array(ipv6).reject(&:blank?).map(&:strip).map(&:upcase)
   end
 
+  def check_puny_symbols
+    regexp = /(\A|\.)..--/
+    errors.add(:hostname, :invalid) if hostname =~ regexp
+  end
+
   def to_s
     hostname
   end