Replace deprecated http.server.CGIHTTPRequestHandler for TestLoginUrl

Scheduled for removal in Python 3.15.

tests/checker/cgi-bin/input2cookies.py

@@ -1,11 +0,0 @@
-#!/usr/bin/python3
-
-from http import cookies
-import sys
-import urllib.parse
-
-C = cookies.SimpleCookie()
-for field, value in urllib.parse.parse_qsl(sys.stdin.read()):
-    C[field] = value
-
-print(C)

tests/checker/httpserver.py

@@ -18,9 +18,8 @@ Define http test support classes for LinkChecker tests.
 """
 
 import html
-from http.server import CGIHTTPRequestHandler, SimpleHTTPRequestHandler, HTTPServer
+from http.server import SimpleHTTPRequestHandler, HTTPServer
 from http.client import HTTPConnection, HTTPSConnection
-import os.path
 import ssl
 import time
 import threading
@@ -304,18 +303,3 @@ class CookieRedirectHttpRequestHandler(NoQueryHttpRequestHandler):
             self.redirect()
         else:
             super().do_HEAD()
-
-
-class CGIHandler(CGIHTTPRequestHandler, StoppableHttpRequestHandler):
-    cgi_path = "/tests/checker/cgi-bin/"
-
-    def is_cgi(self):
-        # CGIHTTPRequestHandler.is_cgi() can only handle a single-level path
-        # override so that we can store scripts under /tests/checker
-        if CGIHandler.cgi_path in self.path:
-            self.cgi_info = (
-                CGIHandler.cgi_path,
-                os.path.relpath(self.path, CGIHandler.cgi_path),
-            )
-            return True
-        return False

tests/checker/test_loginurl.py

@@ -1,4 +1,4 @@
-# Copyright (C) 2020 Chris Mayo
+# Copyright (C) 2020-2023 Chris Mayo
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,17 +18,28 @@ Test director.aggregator.Aggregate.visit_loginurl().
 This includes the retrieval and search of a login form and posting credentials.
 """
 import re
+import urllib.parse
 
-from .httpserver import HttpServerTest, CGIHandler
+from .httpserver import HttpServerTest, StoppableHttpRequestHandler
 from . import get_test_aggregate
 
 
+class LoginPostHandler(StoppableHttpRequestHandler):
+    def do_POST(self):
+        length = int(self.headers.get("content-length"))
+        form_data = self.rfile.read(length).decode()
+        self.send_response(200)
+        for name, value in urllib.parse.parse_qsl(form_data):
+            self.send_header("Set-Cookie", f"{name}={value}")
+        self.end_headers()
+
+
 class TestLoginUrl(HttpServerTest):
     """Test loginurl retrieval, search and posting credentials."""
 
     def __init__(self, methodName="runTest"):
         super().__init__(methodName=methodName)
-        self.handler = CGIHandler
+        self.handler = LoginPostHandler
 
     def visit_loginurl(self, page, user=None, password=None, extrafields=False):
         confargs = {}