Replace cgi.parse_header() with custom function for Python 3.13 compat

The cgi module has been deprecated since Python 3.11 and got removed in
Python 3.13. Replace the cgi.parse_header() function with a custom one,
as recommended by the Python documentation.

Closes #712

Author: t-8ch

spyne/protocol/soap/mime.py

@@ -115,7 +115,7 @@ def collapse_swa(ctx, content_type, ns_soap_env):
             http://www.w3.org/Submission/soap11mtom10/
 
     :param  content_type: value of the Content-Type header field, parsed by
-                          cgi.parse_header() function
+                          spyne.util.http.parse_content_type_header() function
     :param  ctx:          request context
     """
 

spyne/protocol/soap/soap11.py

@@ -38,8 +38,6 @@
 logger = logging.getLogger(__name__)
 logger_invalid = logging.getLogger(__name__ + ".invalid")
 
-import cgi
-
 from itertools import chain
 
 import spyne.const.xml as ns
@@ -50,6 +48,7 @@
 
 from spyne import BODY_STYLE_WRAPPED
 from spyne.util import six
+from spyne.util.http import parse_content_type_header
 from spyne.const.xml import DEFAULT_NS
 from spyne.const.http import HTTP_405, HTTP_500
 from spyne.error import RequestNotAllowed
@@ -197,7 +196,7 @@ def create_in_document(self, ctx, charset=None):
                         "You must issue a POST request with the Content-Type "
                         "header properly set.")
 
-            content_type = cgi.parse_header(content_type)
+            content_type = parse_content_type_header(content_type)
             ctx.in_string = collapse_swa(ctx, content_type, self.ns_soap_env)
 
         ctx.in_document = _parse_xml_string(ctx.in_string,

spyne/server/wsgi.py

@@ -27,7 +27,6 @@
 import logging
 logger = logging.getLogger(__name__)
 
-import cgi
 import threading
 
 from inspect import isgenerator
@@ -44,6 +43,7 @@
 from spyne.server.http import HttpBase, HttpMethodContext, HttpTransportContext
 from spyne.util.odict import odict
 from spyne.util.address import address_parser
+from spyne.util.http import parse_content_type_header
 
 from spyne.const.ansi_color import LIGHT_GREEN
 from spyne.const.ansi_color import END_COLOR
@@ -527,9 +527,9 @@ def __reconstruct_wsgi_request(self, http_env):
         charset = None
         if content_type is not None:
             # fyi, here's what the parse_header function returns:
-            # >>> import cgi; cgi.parse_header("text/xml; charset=utf-8")
+            # >>> parse_content_type_header("text/xml; charset=utf-8")
             # ('text/xml', {'charset': 'utf-8'})
-            content_type = cgi.parse_header(content_type)
+            content_type = parse_content_type_header(content_type)
             charset = content_type[1].get('charset', None)
 
         return self.__wsgi_input_to_iterable(http_env), charset

spyne/util/http.py

@@ -23,6 +23,7 @@
 import sys
 import time
 
+from email.message import EmailMessage
 from time import strftime
 from time import gmtime
 from collections import deque
@@ -72,3 +73,8 @@ def generate_cookie(k, v, max_age=None, domain=None, path=None,
         retval.append("Secure")
 
     return '; '.join(retval)
+
+def parse_content_type_header(h):
+    msg = EmailMessage()
+    msg['content-type'] = h
+    return msg['content-type'].content_type, msg['content-type'].params