Getting Google Talk working with PyXMPP

    Jacek Konieczny has written the wholly fantabulous PyXMPP, which implements Jabber clients and servers in Python. Now, Google Talk is a Jabber server, but it needs TLS support before it works. The code is all there, but the echobot example in the download (look in the examples directory) doesn't show you how. It's not that hard though -- here's the patch I needed to make it work:

      --- echobot.py  2005-12-26 07:25:55.000000000 -0800
      +++ echobot2.py 2006-10-25 04:25:02.000000000 -0700
      @@ -13,6 +13,7 @@
       
       from pyxmpp.all import JID,Iq,Presence,Message,StreamError
       from pyxmpp.jabber.client import JabberClient
      +from pyxmpp import streamtls
       
       class Client(JabberClient):
           """Simple bot (client) example. Uses `pyxmpp.jabber.client.JabberClient`
      @@ -28,8 +29,12 @@
       
               # setup client with provided connection information
               # and identity data
      +
      +        tls = streamtls.TLSSettings(require=True, verify_peer=False)
      +        auth = ['sasl:PLAIN']
               JabberClient.__init__(self, jid, password,
      -                disco_name="PyXMPP example: echo bot", disco_type="bot")
      +                disco_name="PyXMPP example: echo bot", disco_type="bot",
      +                tls_settings=tls, auth_methods=auth)
       
               # register features to be announced via Service Discovery
               self.disco_info.add_feature("jabber:iq:version")
      


    That makes the __init__ method for the client:

      def __init__(self, jid, password):
      
          # if bare JID is provided add a resource -- it is required
          if not jid.resource:
              jid=JID(jid.node, jid.domain, "Echobot")
      
          # setup client with provided connection information
          # and identity data
      
          tls = streamtls.TLSSettings(require=True, verify_peer=False)
          auth = ['sasl:PLAIN']
          JabberClient.__init__(self, jid, password,
                  disco_name="PyXMPP example: echo bot", disco_type="bot",
                  tls_settings=tls, auth_methods=auth)
      
          # register features to be announced via Service Discovery
          self.disco_info.add_feature("jabber:iq:version")
      


    Now the client works with a gtalk login:

      $ ./echobot2.py username@gmail.com supersecretthingie
      creating client...
      connecting...
      *** State changed: resolving srv (u'gmail.com', 'xmpp-client') ***
      *** State changed: resolving 'talk.l.google.com.' ***
      *** State changed: connecting ('72.14.253.125', 5222) ***
      *** State changed: connected ('72.14.253.125', 5222) ***
      looping...
      *** State changed: tls connecting  ***
      *** State changed: tls connected  ***
      *** State changed: fully connected  ***
      *** State changed: authenticated  ***
      *** State changed: binding u'Echobot' ***
      *** State changed: authorized  ***
      mikalstill@gmail.com/Gaim6734F991 has become available
      mikalstill@gmail.com/GaimD2ECF56B has become available(away): I'm not at my 
      desk at work at the moment. This is probably because I'm at a meeting or 
      racing electric scooters. If you IM me I will see the message when I get back.
      My roster:
      mikalstill@gmail.com "" subscription=both groups=
      Message from mikalstill@gmail.com/Gaim6734F991 received. Body: "Hello there". Type: "chat".
      disconnecting...
      exiting...
      $
      


    Too easy.

    Update: mbot is a Google Talk bot engine built on top of this.

    Tags for this post: google gtalk jabber ssl tsl pyxmpp python
    Related posts: mbot: new hotness in Google Talk bots; mbot: new hotness in Google Talk bots; Twisted Python and Jabber SSL; SSL, X509, ASN.1 and certificate validity dates; Twisted conch; Implementing SCP with paramiko

posted at: 16:54 | path: /google/gtalk | permanent link to this entry