From fcda624ed6cee18980a6489572180d8be4c53e7c Mon Sep 17 00:00:00 2001
From: Krzysztof SOCHA <krzysztof.socha@cert.europa.eu>
Date: Wed, 4 Sep 2024 20:25:09 +0200
Subject: [PATCH] Patch URL helper to assume use_appname=False if the host is a
 Fully Qualified Domain Name

---
 py4web/core.py   | 3 +++
 requirements.txt | 1 +
 2 files changed, 4 insertions(+)

diff --git a/py4web/core.py b/py4web/core.py
index 10dae504..92ef1b77 100644
--- a/py4web/core.py
+++ b/py4web/core.py
@@ -37,6 +37,7 @@
 import zipfile
 from collections import OrderedDict
 from contextlib import redirect_stderr, redirect_stdout
+from fqdn import FQDN
 
 import portalocker
 from watchgod import awatch
@@ -860,6 +861,8 @@ def URL(  # pylint: disable=invalid-name
     URL('a','b',vars=dict(x=1),scheme='https') -> https://{domain}/{script_name?}/{app_name?}/a/b?x=1
     URL('a','b',vars=dict(x=1),use_appname=False) -> /{script_name?}/a/b?x=1
     """
+    if FQDN(request.urlparts[1]).is_valid:
+        use_appname = False
     if use_appname is None:
         # force use_appname on domain-unmapped apps
         use_appname = not request.environ.get("HTTP_X_PY4WEB_APPNAME")
diff --git a/requirements.txt b/requirements.txt
index da54f3d4..75464d09 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,6 +15,7 @@ rocket3 >= 20230507.1
 yatl >= 20230507.3
 pydal >= 20240713.1
 watchgod >= 0.6
+fqdn
 
 # optional modules:
 # gunicorn