fix: correct force script name?

highscore/app/middleware.py

@@ -0,0 +1,29 @@
+from collections.abc import Callable
+
+from django.http import HttpRequest, HttpResponse
+
+
+class ScriptPrefixPathMiddleware:
+    """Re-add the ``FORCE_SCRIPT_NAME`` prefix to ``request.path`` under ASGI.
+
+    Django's ASGI handler sets ``request.path = scope["path"]`` verbatim (see
+    ``django/core/handlers/asgi.py``). When the reverse proxy strips the
+    script-name prefix (e.g. ``/scores``) before forwarding, ``request.path`` —
+    and therefore ``get_full_path()`` — loses the prefix, even though
+    ``reverse()`` still prepends it via the script prefix. The result is the
+    admin login form posting to ``/admin/login/?next=/admin/`` instead of
+    ``/scores/admin/login/?next=/scores/admin/``.
+
+    URL resolution is unaffected (it uses ``path_info``), so we only need to
+    realign the path-based URLs with the reverse()-based ones. The check is
+    idempotent: if the proxy already forwards the prefix, this is a no-op.
+    """
+
+    def __init__(self, get_response: Callable[[HttpRequest], HttpResponse]) -> None:
+        self.get_response = get_response
+
+    def __call__(self, request: HttpRequest) -> HttpResponse:
+        script_name = request.META.get("SCRIPT_NAME", "").rstrip("/")
+        if script_name and not request.path.startswith(f"{script_name}/"):
+            request.path = f"{script_name}{request.path}"
+        return self.get_response(request)

highscore/app/served.py

@@ -2,23 +2,18 @@ import subprocess
 import sys
 from pathlib import Path
 
-from app.config import settings as env
-
 
 def serve() -> None:
     """Start the Daphne ASGI server on 0.0.0.0:8080."""
     daphne_path = str(Path(sys.path[0]) / "daphne")
-    args = [
+    subprocess.run(  # noqa: S603
+        [
             daphne_path,
             "-b",
             "0.0.0.0",  # noqa: S104
             "-p",
             "8080",
-    ]
-    # FORCE_SCRIPT_NAME is a WSGI-only setting; under ASGI Django derives the URL
-    # script prefix from the scope's root_path. Pass the prefix to Daphne so that
-    # reverse()/redirects (e.g. the admin post-login redirect) include it.
-    if env.force_script_name:
-        args += ["--root-path", env.force_script_name.rstrip("/")]
-    args.append("app.routing:application")
-    subprocess.run(args, check=True)  # noqa: S603
+            "app.routing:application",
+        ],
+        check=True,
+    )

highscore/app/settings.py

@@ -42,6 +42,7 @@ SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
 MIDDLEWARE = [
     "django.middleware.security.SecurityMiddleware",
     "whitenoise.middleware.WhiteNoiseMiddleware",
+    "app.middleware.ScriptPrefixPathMiddleware",
     "django.contrib.sessions.middleware.SessionMiddleware",
     "django.middleware.common.CommonMiddleware",
     "django.middleware.csrf.CsrfViewMiddleware",