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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 CoroutineCallback
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(
CoroutineCallback('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
async def _handle_starttls_proceed(self, proceed):
"""Restart the XML stream when TLS is accepted."""
log.debug("Starting TLS")
if await self.xmpp.start_tls():
self.xmpp.features.add('starttls')
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