Fixed #32375 -- Started deprecation toward changing the default sitemap protocol to https.

The default sitemap protocol, when it is built outside the context of
a request, will be changed from 'http' to 'https' in Django 5.0.

django/contrib/sitemaps/__init__.py

@@ -1,3 +1,4 @@
+import warnings
 from urllib.parse import urlencode
 from urllib.request import urlopen
 
@@ -7,6 +8,7 @@ from django.core import paginator
 from django.core.exceptions import ImproperlyConfigured
 from django.urls import NoReverseMatch, reverse
 from django.utils import translation
+from django.utils.deprecation import RemovedInDjango50Warning
 
 PING_URL = "https://www.google.com/webmasters/tools/ping"
 
@@ -122,6 +124,16 @@ class Sitemap:
 
     def get_protocol(self, protocol=None):
         # Determine protocol
+        if self.protocol is None and protocol is None:
+            warnings.warn(
+                "The default sitemap protocol will be changed from 'http' to "
+                "'https' in Django 5.0. Set Sitemap.protocol to silence this "
+                "warning.",
+                category=RemovedInDjango50Warning,
+                stacklevel=2,
+            )
+        # RemovedInDjango50Warning: when the deprecation ends, replace 'http'
+        # with 'https'.
         return self.protocol or protocol or 'http'
 
     def get_domain(self, site=None):

docs/internals/deprecation.txt

@@ -24,6 +24,9 @@ details on these changes.
 * The default value of the ``USE_TZ`` setting will change from ``False`` to
   ``True``.
 
+* The default sitemap protocol for sitemaps built outside the context of a
+  request will change from ``'http'`` to ``'https'``.
+
 .. _deprecation-removed-in-4.1:
 
 4.1

docs/ref/contrib/sitemaps.txt

@@ -235,6 +235,11 @@ Note:
         sitemap was requested is used. If the sitemap is built outside the
         context of a request, the default is ``'http'``.
 
+        .. deprecated:: 4.0
+
+            The default protocol for sitemaps built outside the context of a
+            request will change from ``'http'`` to ``'https'`` in Django 5.0.
+
     .. attribute:: Sitemap.limit
 
         **Optional.**

docs/releases/4.0.txt

@@ -459,6 +459,9 @@ Miscellaneous
 
 * The undocumented ``django.utils.datetime_safe`` module is deprecated.
 
+* The default sitemap protocol for sitemaps built outside the context of a
+  request will change from ``'http'`` to ``'https'`` in Django 5.0.
+
 Features removed in 4.0
 =======================
 

tests/sitemaps_tests/test_generic.py

@@ -1,7 +1,8 @@
 from datetime import datetime
 
 from django.contrib.sitemaps import GenericSitemap
-from django.test import override_settings
+from django.test import ignore_warnings, override_settings
+from django.utils.deprecation import RemovedInDjango50Warning
 
 from .base import SitemapTestsBase
 from .models import TestModel
@@ -70,6 +71,17 @@ class GenericViewsSitemapTests(SitemapTestsBase):
             with self.subTest(protocol=protocol):
                 self.assertEqual(sitemap.get_protocol(protocol), protocol)
 
+    @ignore_warnings(category=RemovedInDjango50Warning)
     def test_get_protocol_default(self):
         sitemap = GenericSitemap({'queryset': None})
         self.assertEqual(sitemap.get_protocol(), 'http')
+
+    def test_get_protocol_default_warning(self):
+        sitemap = GenericSitemap({'queryset': None})
+        msg = (
+            "The default sitemap protocol will be changed from 'http' to "
+            "'https' in Django 5.0. Set Sitemap.protocol to silence this "
+            "warning."
+        )
+        with self.assertWarnsMessage(RemovedInDjango50Warning, msg):
+            sitemap.get_protocol()

tests/sitemaps_tests/test_http.py

@@ -4,8 +4,9 @@ from datetime import date
 from django.contrib.sitemaps import Sitemap
 from django.contrib.sites.models import Site
 from django.core.exceptions import ImproperlyConfigured
-from django.test import modify_settings, override_settings
+from django.test import ignore_warnings, modify_settings, override_settings
 from django.utils import translation
+from django.utils.deprecation import RemovedInDjango50Warning
 from django.utils.formats import localize
 
 from .base import SitemapTestsBase
@@ -197,6 +198,7 @@ class HTTPSitemapTests(SitemapTestsBase):
 """ % date.today()
         self.assertXMLEqual(response.content.decode(), expected_content)
 
+    @ignore_warnings(category=RemovedInDjango50Warning)
     def test_sitemap_get_urls_no_site_1(self):
         """
         Check we get ImproperlyConfigured if we don't pass a site object to
@@ -207,6 +209,7 @@ class HTTPSitemapTests(SitemapTestsBase):
             Sitemap().get_urls()
 
     @modify_settings(INSTALLED_APPS={'remove': 'django.contrib.sites'})
+    @ignore_warnings(category=RemovedInDjango50Warning)
     def test_sitemap_get_urls_no_site_2(self):
         """
         Check we get ImproperlyConfigured when we don't pass a site object to
@@ -216,6 +219,7 @@ class HTTPSitemapTests(SitemapTestsBase):
         with self.assertRaisesMessage(ImproperlyConfigured, self.use_sitemap_err_msg):
             Sitemap().get_urls()
 
+    @ignore_warnings(category=RemovedInDjango50Warning)
     def test_sitemap_item(self):
         """
         Check to make sure that the raw item is included with each