--- a/rollbot.py	Mon May 09 21:24:39 2016 +0800
+++ b/rollbot.py	Mon May 09 21:25:51 2016 +0800
@@ -14,34 +14,51 @@
 
 
 class RollBot(sleekxmpp.ClientXMPP):
-    def __init__(self, jid, password):
+    def __init__(self, jid, password, nick):
         sleekxmpp.ClientXMPP.__init__(self, jid, password)
 
+        self.nick = nick
+
         self.add_event_handler('session_start', self.start)
+        self.add_event_handler('groupchat_invite', self.muc_invite)
+        self.add_event_handler('groupchat_direct_invite', self.muc_direct_invite)
 
     def start(self, event):
         self.get_roster()
         self.send_presence()
 
+    def muc_invite(self, invite):
+        room = invite['from']
+        password = '' # https://github.com/fritzy/SleekXMPP/issues/409
+        self.plugin['xep_0045'].joinMUC(room, self.nick, password=password, wait=True)
+
+    def muc_direct_invite(self, invite):
+        room = invite['groupchat_invite']['jid']
+        password = invite['groupchat_invite']['password']
+        self.plugin['xep_0045'].joinMUC(room, self.nick, password=password, wait=True)
+
 
 def main():
     parser = ArgumentParser()
 
     parser.add_argument('-j', '--jid', dest='jid', help='JID to use')
     parser.add_argument('-p', '--password', dest='password', help='password to use')
+    parser.add_argument('-n', '--nick', dest='nick', help='MUC nickname', default='rollbot')
     parser.add_argument('-d', '--debug', help='set logging to DEBUG', action='store_const', dest='loglevel', const=logging.DEBUG, default=logging.INFO)
 
     args = parser.parse_args()
 
     logging.basicConfig(level=args.loglevel, format='%(asctime)s %(levelname)-8s %(message)s')
 
-    rollbot = RollBot(args.jid, args.password)
+    rollbot = RollBot(args.jid, args.password, args.nick)
     rollbot.auto_authorize = True
     rollbot.auto_subscribe = True
     rollbot.register_plugin('xep_0030') # Service Discovery
+    rollbot.register_plugin('xep_0045') # Multi-User Chat
     rollbot.register_plugin('xep_0092') # Software Version
     rollbot.register_plugin('xep_0199') # XMPP Ping
     rollbot.register_plugin('xep_0202') # Entity Time
+    rollbot.register_plugin('xep_0249') # Direct MUC Invitations
 
     if rollbot.connect():
         logging.info('RollBot connected')