Add protocols.irc.certfile

Fixes #612.

src/conf.py

@@ -1064,6 +1064,10 @@ registerGlobalValue(supybot.protocols.irc, 'strictRfc',
     a nick such as services@this.network.server then you you should set this to
     False.""")))
 
+registerGlobalValue(supybot.protocols.irc, 'certfile',
+    registry.String('', _("""Determines what certificate file (if any) the bot
+    will use connect with SSL sockets by default.""")))
+
 registerGlobalValue(supybot.protocols.irc, 'umodes',
     registry.String('', _("""Determines what user modes the bot will request
     from the server when it first connects.  Many people might choose +i; some

src/drivers/Socket.py

@@ -307,6 +307,8 @@ class SocketDriver(drivers.IrcDriver, drivers.ServersMixin):
                 assert 'ssl' in globals()
                 certfile = getattr(conf.supybot.networks, self.irc.network) \
                         .certfile()
+                if not certfile:
+                    certfile = conf.supybot.protocols.irc.certfile()
                 if not certfile:
                     certfile = None
                 elif not os.path.isfile(certfile):