Hosts attribute for domain info

app/controllers/epp/domains_controller.rb

@@ -17,6 +17,17 @@ class Epp::DomainsController < EppController
 
   def info
     authorize! :info, @domain, @password
+    @hosts = params[:parsed_frame].css('name').first['hosts'] || 'all'
+
+    case @hosts
+    when 'del'
+      @nameservers = @domain.delegated_nameservers
+    when 'sub'
+      @nameservers = @domain.subordinate_nameservers
+    when 'all'
+      @nameservers = @domain.nameservers
+    end
+
     render_epp_response '/epp/domains/info'
   end
 
@@ -88,6 +99,7 @@ class Epp::DomainsController < EppController
   def validate_info
     @prefix = 'info > info >'
     requires('name')
+    optional_attribute 'name', 'hosts', values: %(all, sub, del, none)
   end
 
   def validate_check

app/controllers/epp_controller.rb

@@ -139,6 +139,20 @@ class EppController < ApplicationController
     }
   end
 
+  def optional_attribute(element_selector, attribute_selector, options)
+    element = requires(element_selector, allow_blank: options[:allow_blank])
+    return unless element
+
+    attribute = element[attribute_selector]
+
+    return if (attribute && options[:values].include?(attribute)) || !attribute
+
+    epp_errors << {
+      code: '2306',
+      msg: I18n.t('attribute_is_invalid', attribute: attribute_selector)
+    }
+  end
+
   def exactly_one_of(*selectors)
     full_selectors = create_full_selectors(*selectors)
     return if element_count(*full_selectors, use_prefix: false) == 1