Force 'https://www.python.org/' URLs for ReleaseFile properties

apps/downloads/migrations/0015_releasefile_python_dot_org_urls.py

@@ -0,0 +1,59 @@
+# Generated by Django 5.2.11 on 2026-02-25 14:13
+
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("downloads", "0014_releasefile_sha256_sum"),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name="releasefile",
+            constraint=models.CheckConstraint(
+                condition=models.Q(
+                    models.Q(
+                        ("url__exact", ""),
+                        ("url__startswith", "https://www.python.org/"),
+                        ("url__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                    models.Q(
+                        ("gpg_signature_file__exact", ""),
+                        ("gpg_signature_file__startswith", "https://www.python.org/"),
+                        ("gpg_signature_file__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                    models.Q(
+                        ("sigstore_signature_file__exact", ""),
+                        ("sigstore_signature_file__startswith", "https://www.python.org/"),
+                        ("sigstore_signature_file__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                    models.Q(
+                        ("sigstore_cert_file__exact", ""),
+                        ("sigstore_cert_file__startswith", "https://www.python.org/"),
+                        ("sigstore_cert_file__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                    models.Q(
+                        ("sigstore_bundle_file__exact", ""),
+                        ("sigstore_bundle_file__startswith", "https://www.python.org/"),
+                        ("sigstore_bundle_file__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                    models.Q(
+                        ("sbom_spdx2_file__exact", ""),
+                        ("sbom_spdx2_file__startswith", "https://www.python.org/"),
+                        ("sbom_spdx2_file__startswith", "http://www.python.org/"),
+                        _connector="OR",
+                    ),
+                ),
+                name="only_python_dot_org_urls",
+                violation_error_message="All file URLs must begin with 'https://www.python.org/'",
+            ),
+        ),
+    ]

apps/downloads/models.py

@@ -357,6 +357,17 @@ def update_boxes_on_release_file_delete(sender, instance, **kwargs):
     _update_boxes_for_release_file(instance)
 
 
+def condition_url_is_blank_or_python_dot_org(column: str):
+    """Conditions for a URLField column to force 'http[s]://python.org'."""
+    return (
+        models.Q(**{f"{column}__exact": ""})
+        | models.Q(**{f"{column}__startswith": "https://www.python.org/"})
+        # Older releases allowed 'http://'. 'https://' is required at
+        # the API level, so shouldn't show up in newer releases.
+        | models.Q(**{f"{column}__startswith": "http://www.python.org/"})
+    )
+
+
 class ReleaseFile(ContentManageable, NameSlugModel):
     """Individual files in a release.
 
@@ -406,4 +417,16 @@ class Meta:
                 condition=models.Q(download_button=True),
                 name="only_one_download_per_os_per_release",
             ),
+            models.CheckConstraint(
+                condition=(
+                    condition_url_is_blank_or_python_dot_org("url")
+                    & condition_url_is_blank_or_python_dot_org("gpg_signature_file")
+                    & condition_url_is_blank_or_python_dot_org("sigstore_signature_file")
+                    & condition_url_is_blank_or_python_dot_org("sigstore_cert_file")
+                    & condition_url_is_blank_or_python_dot_org("sigstore_bundle_file")
+                    & condition_url_is_blank_or_python_dot_org("sbom_spdx2_file")
+                ),
+                name="only_python_dot_org_urls",
+                violation_error_message="All file URLs must begin with 'https://www.python.org/'",
+            ),
         ]

apps/downloads/tests/base.py

@@ -36,22 +36,22 @@ def setUp(self):
             release=self.release_275,
             name="Windows x86 MSI Installer (2.7.5)",
             description="Windows binary -- does not include source",
-            url="ftp/python/2.7.5/python-2.7.5.msi",
+            url="https://www.python.org/ftp/python/2.7.5/python-2.7.5.msi",
         )
         self.release_275_windows_64bit = ReleaseFile.objects.create(
             os=self.windows,
             release=self.release_275,
             name="Windows X86-64 MSI Installer (2.7.5)",
             description="Windows AMD64 / Intel 64 / X86-64 binary -- does not include source",
-            url="ftp/python/2.7.5/python-2.7.5.amd64.msi",
+            url="https://www.python.org/ftp/python/2.7.5/python-2.7.5.amd64.msi",
         )
 
         self.release_275_osx = ReleaseFile.objects.create(
             os=self.osx,
             release=self.release_275,
             name="Mac OSX 64-bit/32-bit",
             description="Mac OS X 10.6 and later",
-            url="ftp/python/2.7.5/python-2.7.5-macosx10.6.dmg",
+            url="https://www.python.org/ftp/python/2.7.5/python-2.7.5-macosx10.6.dmg",
         )
 
         self.release_275_linux = ReleaseFile.objects.create(
@@ -60,7 +60,7 @@ def setUp(self):
             release=self.release_275,
             is_source=True,
             description="Gzipped source",
-            url="ftp/python/2.7.5/Python-2.7.5.tgz",
+            url="https://www.python.org/ftp/python/2.7.5/Python-2.7.5.tgz",
             filesize=12345678,
         )
 
@@ -77,7 +77,7 @@ def setUp(self):
             release=self.draft_release,
             is_source=True,
             description="Gzipped source",
-            url="ftp/python/9.7.2/Python-9.7.2.tgz",
+            url="https://www.python.org/ftp/python/9.7.2/Python-9.7.2.tgz",
         )
 
         self.hidden_release = Release.objects.create(

apps/downloads/tests/test_models.py

@@ -1,7 +1,10 @@
 import datetime as dt
 from unittest.mock import patch
 
-from apps.downloads.models import Release, ReleaseFile
+from django.db import IntegrityError, transaction
+from django.db.models import URLField
+
+from apps.downloads.models import OS, Release, ReleaseFile
 from apps.downloads.tests.base import BaseDownloadTests
 
 
@@ -160,7 +163,7 @@ def test_update_supernav(self):
                 release=self.python_3,
                 slug=slug,
                 name="Python 3.10",
-                url=f"/ftp/python/{slug}.zip",
+                url=f"https://www.python.org/ftp/python/{slug}.zip",
                 download_button=True,
             )
 
@@ -179,7 +182,7 @@ def test_update_supernav(self):
             os=self.windows,
             release=release,
             name="MSIX",
-            url="/ftp/python/pymanager/pymanager-25.0.msix",
+            url="https://www.python.org/ftp/python/pymanager/pymanager-25.0.msix",
             download_button=True,
         )
 
@@ -199,7 +202,7 @@ def test_update_supernav_skips_os_without_files(self):
         """
         # Arrange
         from apps.boxes.models import Box
-        from apps.downloads.models import OS, update_supernav
+        from apps.downloads.models import update_supernav
 
         # Create an OS without any release files
         OS.objects.create(name="Android", slug="android")
@@ -215,7 +218,7 @@ def test_update_supernav_skips_os_without_files(self):
                 release=self.python_3,
                 slug=slug,
                 name="Python 3.10",
-                url=f"/ftp/python/{slug}.zip",
+                url=f"https://www.python.org/ftp/python/{slug}.zip",
                 download_button=True,
             )
 
@@ -247,7 +250,7 @@ def test_release_file_save_triggers_box_updates(self, mock_home, mock_sources, m
             os=self.windows,
             release=self.python_3,
             name="Windows installer",
-            url="/ftp/python/3.10.19/python-3.10.19.exe",
+            url="https://www.python.org/ftp/python/3.10.19/python-3.10.19.exe",
             download_button=True,
         )
 
@@ -268,7 +271,7 @@ def test_release_file_save_skips_unpublished_release(self, mock_home, mock_sourc
             os=self.windows,
             release=self.draft_release,
             name="Windows installer draft",
-            url="/ftp/python/9.7.2/python-9.7.2.exe",
+            url="https://www.python.org/ftp/python/9.7.2/python-9.7.2.exe",
         )
 
         mock_supernav.assert_not_called()
@@ -289,3 +292,22 @@ def test_release_file_delete_triggers_box_updates(self, mock_home, mock_sources,
         mock_supernav.assert_called()
         mock_sources.assert_called()
         mock_home.assert_called()
+
+    def test_release_file_urls_not_python_dot_org(self):
+        for field in ReleaseFile._meta.get_fields():  # noqa: SLF001
+            if not isinstance(field, URLField):
+                continue
+            with self.subTest(field.name), transaction.atomic():
+                kwargs = {
+                    "url": "https://www.python.org/ftp/python/9.7.2/python-9.7.2.exe",
+                    # field.name may be 'url', but will replace the default value.
+                    field.name: "https://notpython.com/python-9.7.2.txt",
+                }
+
+                with self.assertRaises(IntegrityError):
+                    ReleaseFile.objects.create(
+                        os=self.windows,
+                        release=self.draft_release,
+                        name="Windows installer draft",
+                        **kwargs,
+                    )