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# -*- coding: utf-8 -*-
"""
sleekxmpp.clientxmpp
~~~~~~~~~~~~~~~~~~~~
This module provides XMPP functionality that
is specific to external server component connections.
Part of SleekXMPP: The Sleek XMPP Library
:copyright: (c) 2011 Nathanael C. Fritz
:license: MIT, see LICENSE for more details
"""
from __future__ import absolute_import
import logging
import sys
import hashlib
from sleekxmpp.basexmpp import BaseXMPP
from sleekxmpp.xmlstream import XMLStream
from sleekxmpp.xmlstream import ET
from sleekxmpp.xmlstream.matcher import MatchXPath
from sleekxmpp.xmlstream.handler import Callback
log = logging.getLogger(__name__)
class ComponentXMPP(BaseXMPP):
"""
SleekXMPP's basic XMPP server component.
Use only for good, not for evil.
:param jid: The JID of the component.
:param secret: The secret or password for the component.
:param host: The server accepting the component.
:param port: The port used to connect to the server.
:param plugin_config: A dictionary of plugin configurations.
:param plugin_whitelist: A list of approved plugins that
will be loaded when calling
:meth:`~sleekxmpp.basexmpp.BaseXMPP.register_plugins()`.
:param use_jc_ns: Indicates if the ``'jabber:client'`` namespace
should be used instead of the standard
``'jabber:component:accept'`` namespace.
Defaults to ``False``.
"""
def __init__(self, jid, secret, host=None, port=None,
plugin_config={}, plugin_whitelist=[], use_jc_ns=False):
if use_jc_ns:
default_ns = 'jabber:client'
else:
default_ns = 'jabber:component:accept'
BaseXMPP.__init__(self, jid, default_ns)
self.auto_authorize = None
self.stream_header = "<stream:stream %s %s to='%s'>" % (
'xmlns="jabber:component:accept"',
'xmlns:stream="%s"' % self.stream_ns,
jid)
self.stream_footer = "</stream:stream>"
self.server_host = host
self.server_port = port
self.secret = secret
self.plugin_config = plugin_config
self.plugin_whitelist = plugin_whitelist
self.is_component = True
self.register_handler(
Callback('Handshake',
MatchXPath('{jabber:component:accept}handshake'),
self._handle_handshake))
self.add_event_handler('presence_probe',
self._handle_probe)
def connect(self, host=None, port=None, use_ssl=False,
use_tls=True, reattempt=True):
"""Connect to the server.
Setting ``reattempt`` to ``True`` will cause connection attempts to
be made every second until a successful connection is established.
:param host: The name of the desired server for the connection.
Defaults to :attr:`server_host`.
:param port: Port to connect to on the server.
Defauts to :attr:`server_port`.
:param use_ssl: Flag indicating if SSL should be used by connecting
directly to a port using SSL.
:param use_tls: Flag indicating if TLS should be used, allowing for
connecting to a port without using SSL immediately and
later upgrading the connection.
:param reattempt: Flag indicating if the socket should reconnect
after disconnections.
"""
if host is None:
host = self.server_host
if port is None:
port = self.server_port
log.debug("Connecting to %s:%s", host, port)
return XMLStream.connect(self, host=host, port=port,
use_ssl=use_ssl,
use_tls=use_tls,
reattempt=reattempt)
def incoming_filter(self, xml):
"""
Pre-process incoming XML stanzas by converting any
``'jabber:client'`` namespaced elements to the component's
default namespace.
:param xml: The XML stanza to pre-process.
"""
if xml.tag.startswith('{jabber:client}'):
xml.tag = xml.tag.replace('jabber:client', self.default_ns)
# The incoming_filter call is only made on top level stanza
# elements. So we manually continue filtering on sub-elements.
for sub in xml:
self.incoming_filter(sub)
return xml
def start_stream_handler(self, xml):
"""
Once the streams are established, attempt to handshake
with the server to be accepted as a component.
:param xml: The incoming stream's root element.
"""
BaseXMPP.start_stream_handler(self, xml)
# Construct a hash of the stream ID and the component secret.
sid = xml.get('id', '')
pre_hash = '%s%s' % (sid, self.secret)
if sys.version_info >= (3, 0):
# Handle Unicode byte encoding in Python 3.
pre_hash = bytes(pre_hash, 'utf-8')
handshake = ET.Element('{jabber:component:accept}handshake')
handshake.text = hashlib.sha1(pre_hash).hexdigest().lower()
self.send_xml(handshake, now=True)
def _handle_handshake(self, xml):
"""The handshake has been accepted.
:param xml: The reply handshake stanza.
"""
self.session_started_event.set()
self.event("session_start")
def _handle_probe(self, presence):
pto = presence['to'].bare
pfrom = presence['from'].bare
self.roster[pto][pfrom].handle_probe(presence)
|
