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"""
Slixmpp: The Slick XMPP Library
Copyright (C) 2011 Nathanael C. Fritz
This file is part of Slixmpp.
See the file LICENSE for copying permission.
"""
import logging
from slixmpp.stanza import StreamFeatures
from slixmpp.xmlstream import register_stanza_plugin
from slixmpp.plugins import BasePlugin
from slixmpp.xmlstream.matcher import MatchXPath
from slixmpp.xmlstream.handler import Callback
from slixmpp.features.feature_starttls import stanza
log = logging.getLogger(__name__)
class FeatureSTARTTLS(BasePlugin):
name = 'feature_starttls'
description = 'RFC 6120: Stream Feature: STARTTLS'
dependencies = set()
stanza = stanza
def plugin_init(self):
self.xmpp.register_handler(
Callback('STARTTLS Proceed',
MatchXPath(stanza.Proceed.tag_name()),
self._handle_starttls_proceed,
instream=True))
self.xmpp.register_feature('starttls',
self._handle_starttls,
restart=True,
order=self.config.get('order', 0))
self.xmpp.register_stanza(stanza.Proceed)
self.xmpp.register_stanza(stanza.Failure)
register_stanza_plugin(StreamFeatures, stanza.STARTTLS)
def _handle_starttls(self, features):
"""
Handle notification that the server supports TLS.
Arguments:
features -- The stream:features element.
"""
if 'starttls' in self.xmpp.features:
# We have already negotiated TLS, but the server is
# offering it again, against spec.
return False
elif self.xmpp.disable_starttls:
return False
else:
self.xmpp.send(features['starttls'])
return True
def _handle_starttls_proceed(self, proceed):
"""Restart the XML stream when TLS is accepted."""
log.debug("Starting TLS")
if self.xmpp.start_tls():
self.xmpp.features.add('starttls')
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