sasl.py 文件源码

def start(self):
        """
        Start SASL authentication exchange.

        Used the authenticator's C{jid} and C{password} attribute for the
        authentication credentials. If no supported SASL mechanisms are
        advertized by the receiving party, a failing deferred is returned with
        a L{SASLNoAcceptableMechanism} exception.
        """

        jid = self.xmlstream.authenticator.jid
        password = self.xmlstream.authenticator.password

        mechanisms = get_mechanisms(self.xmlstream)
        if 'DIGEST-MD5' in mechanisms:
            self.mechanism = sasl_mechanisms.DigestMD5('xmpp', jid.host, None,
                                                       jid.user, password)
        elif 'PLAIN' in mechanisms:
            self.mechanism = sasl_mechanisms.Plain(None, jid.user, password)
        else:
            return defer.fail(SASLNoAcceptableMechanism)

        self._deferred = defer.Deferred()
        self.xmlstream.addObserver('/challenge', self.onChallenge)
        self.xmlstream.addOnetimeObserver('/success', self.onSuccess)
        self.xmlstream.addOnetimeObserver('/failure', self.onFailure)
        self.sendAuth(self.mechanism.getInitialResponse())
        return self._deferred