python-FormEncode/do-not-always-use-cgi-module.patch

From 77053ce944c11b1bae67cee387275e9f36d8d049 Mon Sep 17 00:00:00 2001
From: Oleg Broytman <phd@phdru.name>
Date: Fri, 10 Nov 2023 18:17:15 +0300
Subject: [PATCH] Protect `import cgi`

Module `cgi` was declared obsolete in Python 3.11
and will be removed in 3.13.

Fixes: #175.
---
 src/formencode/validators.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/formencode/validators.py b/src/formencode/validators.py
index f2011b4..6f272b7 100644
--- a/src/formencode/validators.py
+++ b/src/formencode/validators.py
@@ -5,7 +5,10 @@
 Validator/Converters for use with FormEncode.
 """
 
-import cgi
+try:
+    import cgi
+except ImportError:  # Python >= 3.13
+    cgi = None
 import re
 import warnings
 from encodings import idna
@@ -1772,7 +1775,7 @@ class FieldStorageUploadConverter(FancyValidator):
     no upload was given).
     """
     def _convert_to_python(self, value, state=None):
-        if isinstance(value, cgi.FieldStorage):
+        if cgi and isinstance(value, cgi.FieldStorage):
             if getattr(value, 'filename', None):
                 return value
             raise Invalid('invalid', value, state)
@@ -1780,7 +1783,7 @@ def _convert_to_python(self, value, state=None):
             return value
 
     def is_empty(self, value):
-        if isinstance(value, cgi.FieldStorage):
+        if cgi and isinstance(value, cgi.FieldStorage):
             return not bool(getattr(value, 'filename', None))
         return FancyValidator.is_empty(self, value)
 
@@ -1825,7 +1828,7 @@ def _convert_to_python(self, value, state):
         upload = value.get(self.upload_key)
         static = value.get(self.static_key, '').strip()
         filename = content = None
-        if isinstance(upload, cgi.FieldStorage):
+        if cgi and isinstance(upload, cgi.FieldStorage):
             filename = upload.filename
             content = upload.value
         elif isinstance(upload, str) and upload: