Use irc bot connection factory for SSL

The ib3 SSL object is not compatible with python3.12 and newer due to
ssl.wrap_socket being removed. This has been fixed upstream in this
pull request [0], but that code is not released to pypi.

To workaround this we simply create our own connection factory for the
irc bot using ssl's default ssl context's socket wrapper.

[0] https://github.com/bd808/python-ib3/issues/23

Change-Id: I4d670b7ebb5efcab1237f27fcb39f635db854cf5

gerritbot/bot.py

@@ -18,14 +18,15 @@
 import argparse
 import configparser
 import daemon
+import functools
 from ib3.auth import SASL
-from ib3.connection import SSL
 import irc.bot
 import irc.client
 import json
 import logging.config
 import os
 import re
+import ssl
 import threading
 import time
 import yaml
@@ -101,7 +102,25 @@ class Channel(object):
         self.last_used = time.time()
 
 
-class BaseGerritBot(SSL, irc.bot.SingleServerIRCBot):
+class BaseGerritBot(irc.bot.SingleServerIRCBot):
+    def __init__(self, server_list, nickname, realname, *args, **kwargs):
+        server = server_list[0][0]
+        port = server_list[0][1]
+        if port == 6697:
+            # Taken from the example in the Factory class docstring at
+            # https://github.com/jaraco/irc/blob/main/irc/connection.py
+            context = ssl.create_default_context()
+            wrapper = functools.partial(
+                context.wrap_socket, server_hostname=server)
+            factory = irc.connection.Factory(wrapper=wrapper)
+            kwargs['connect_factory'] = factory
+        super(BaseGerritBot, self).__init__(
+            server_list=server_list,
+            nickname=nickname,
+            realname=realname,
+            *args,
+            **kwargs)
+
     def send(self, channel_name, msg):
         self.log.info('Sending "%s" to %s' % (msg, channel_name))
         if channel_name not in self.joined_channels: