extensions/views/mixins.py

@@ -66,6 +66,14 @@ class DraftMixin:
     """If the extension is incomplete, returns the FinalizeDraftView"""
 
     def dispatch(self, request, *args, **kwargs):
+        if (
+            'slug' in kwargs
+            and Extension.objects.filter(
+                slug=kwargs['slug'], status=Extension.STATUSES.APPROVED
+            ).first()
+        ):
+            return super().dispatch(request, *args, **kwargs)
+
         extension = (
             Extension.objects.listed_or_authored_by(user_id=self.request.user.pk)
             .filter(status=Extension.STATUSES.INCOMPLETE)

files/apps.py

@@ -7,3 +7,10 @@ class FilesConfig(AppConfig):
 
     def ready(self):
         import files.signals  # noqa: F401
+
+        # Ubuntu 22.04 and earlier don't have WebP in `/etc/mime.types`,
+        # which makes .webp invalid from standpoint of file upload forms.
+        # FIXME: remove once the application is running on the next Ubuntu 24.04 LTS
+        import mimetypes
+
+        mimetypes.add_type('image/webp', '.webp', strict=True)