old_contents: # -*- coding: utf-8 -*-
  from django.contrib.sitemaps import Sitemap
  from django.utils import translation
  from cms.models import Title
  
  
  def from_iterable(iterables):
      """
      Backport of itertools.chain.from_iterable
      """
      for it in iterables:
          for element in it:
              yield element
  
  
  class CMSSitemap(Sitemap):
      changefreq = "monthly"
      priority = 0.5
  
      def items(self):
          all_titles = Title.objects.public().filter(page__login_required=False)
          return all_titles
  
      def lastmod(self, title):
          modification_dates = [title.page.changed_date, title.page.publication_date]
          plugins_for_placeholder = lambda placeholder: placeholder.get_plugins()
          plugins = from_iterable(map(plugins_for_placeholder, title.page.placeholders.all()))
          plugin_modification_dates = map(lambda plugin: plugin.changed_date, plugins)
          modification_dates.extend(plugin_modification_dates)
          return max(modification_dates)
  
      def location(self, title):
          translation.activate(title.language)
          url = title.page.get_absolute_url(title.language)
          translation.deactivate()
          return url
  
new_contents: # -*- coding: utf-8 -*-
  
  from django.contrib.sitemaps import Sitemap
  from django.db.models import Q
  from django.utils import translation
  
  from cms.models import Title
  
  
  def from_iterable(iterables):
      """
      Backport of itertools.chain.from_iterable
      """
      for it in iterables:
          for element in it:
              yield element
  
  
  class CMSSitemap(Sitemap):
      changefreq = "monthly"
      priority = 0.5
  
      def items(self):
          #
          # It is counter-productive to provide entries for:
          #   > Pages which redirect:
          #       - If the page redirects to another page on this site, the
          #         destination page will already be in the sitemap, and
          #       - If the page redirects externally, then it shouldn't be
          #         part of our sitemap anyway.
          #   > Pages which cannot be accessed by anonymous users (like
          #     search engines are).
          #
          all_titles = Title.objects.public().filter(
              Q(redirect='') | Q(redirect__isnull=True),
              page__login_required=False
          )
          return all_titles
  
      def lastmod(self, title):
          modification_dates = [title.page.changed_date, title.page.publication_date]
          plugins_for_placeholder = lambda placeholder: placeholder.get_plugins()
          plugins = from_iterable(map(plugins_for_placeholder, title.page.placeholders.all()))
          plugin_modification_dates = map(lambda plugin: plugin.changed_date, plugins)
          modification_dates.extend(plugin_modification_dates)
          return max(modification_dates)
  
      def location(self, title):
          translation.activate(title.language)
          url = title.page.get_absolute_url(title.language)
          translation.deactivate()
          return url
  
subject: Remove redirected pages from the sitemap