text: from __future__ import absolute_import, unicode_literals
  
  from django.conf.urls import include, url
  from django.contrib.auth.models import Permission
  from django.core import urlresolvers
  from django.utils.translation import ugettext_lazy as _
  
  from wagtail.wagtailadmin.menu import MenuItem
  from wagtail.wagtailcore import hooks
  from wagtail.wagtailcore.permissions import site_permission_policy
  from wagtail.wagtailsites import urls
  
  
  @hooks.register('register_admin_urls')
  def register_admin_urls():
      return [
          url(r'^sites/', include(urls, app_name='wagtailsites', namespace='wagtailsites')),
      ]
  
  
  class SitesMenuItem(MenuItem):
      def is_shown(self, request):
          return site_permission_policy.user_has_any_permission(
              request.user, ['add', 'change', 'delete']
          )
  
  
  @hooks.register('register_settings_menu_item')
  def register_sites_menu_item():
      return SitesMenuItem(_('Sites'), urlresolvers.reverse('wagtailsites:index'),
                           classnames='icon icon-site', order=602)
  
  
  @hooks.register('register_permissions')
  def register_permissions():
      return Permission.objects.filter(content_type__app_label='wagtailcore',
                                       codename__in=['add_site', 'change_site', 'delete_site'])
  