Fix compatibility with Python 3.13

src/saml2/httputil.py

@@ -1,4 +1,3 @@
-import cgi
 import hashlib
 import hmac
 from http.cookies import SimpleCookie
@@ -182,7 +181,10 @@ def extract(environ, empty=False, err=False):
     :param empty: Stops on empty fields (default: Fault)
     :param err: Stops on errors in fields (default: Fault)
     """
-    formdata = cgi.parse(environ["wsgi.input"], environ, empty, err)
+    input_stream = environ["wsgi.input"]
+    content_length = int(environ.get("CONTENT_LENGTH", 0))
+    input_data = input_stream.read(content_length).decode('utf-8')
+    formdata = parse_qs(input_data)
     # Remove single entries from lists
     for key, value in iter(formdata.items()):
         if len(value) == 1:

src/saml2/pack.py

@@ -8,14 +8,9 @@
 """
 
 import base64
-
-
-try:
-    import html
-except Exception:
-    import cgi as html  # type: ignore[no-redef]
-
+import html
 import logging
+
 from urllib.parse import urlencode
 from urllib.parse import urlparse
 from xml.etree import ElementTree as ElementTree

src/saml2/server.py

@@ -4,11 +4,11 @@
 """Contains classes and functions that a SAML2.0 Identity provider (IdP)
 or attribute authority (AA) may use to conclude its tasks.
 """
-import dbm
 import importlib
 import logging
 import shelve
 import threading
+from dbm import error as DbmError
 
 from saml2 import BINDING_HTTP_REDIRECT
 from saml2 import class_name
@@ -58,13 +58,8 @@
 def _shelve_compat(name, *args, **kwargs):
     try:
         return shelve.open(name, *args, **kwargs)
-    except dbm.error[0]:
-        # Python 3 whichdb needs to try .db to determine type
-        if name.endswith(".db"):
-            name = name.rsplit(".db", 1)[0]
-            return shelve.open(name, *args, **kwargs)
-        else:
-            raise
+    except DbmError:
+        return shelve.open(name.removesuffix(".db"), *args, **kwargs)
 
 
 class Server(Entity):