introduced ability to auto detect CNAME of custom domain

app/models/conference.rb

@@ -92,6 +92,28 @@ class Conference < ActiveRecord::Base
     user.present? && registrations.where(user_id: user.id).count > 0
   end
 
+  ##
+  # Checks if domain correctly points to the hosted version
+  # This feature is enabled only if ENV['OSEM_HOSTNAME'] is present
+  #
+  # ====Returns
+  # * +true+ -> If the custom domain has a CNAME record for the hosted version
+  # * +false+ -> If the custom domain does not have a CNAME record for the hosted version
+  def check_custom_domain
+    require 'resolv'
+
+    unless ENV['OSEM_HOSTNAME'].nil?
+      cname_record = Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME)
+      if cname_record.present?
+        return ENV['OSEM_HOSTNAME'] == Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME).first.name.to_s
+      else
+        return false
+      end
+    end
+
+    '--feature disabled--'
+  end
+
   ##
   # Delete all EventSchedules that are not in the hours range
   # After the conference has been successfully updated