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# slixmpp.clientxmpp
# ~~~~~~~~~~~~~~~~~~~~
# This module provides XMPP functionality that
# is specific to external server component connections.
# Part of Slixmpp: The Slick XMPP Library
# :copyright: (c) 2011 Nathanael C. Fritz
# :license: MIT, see LICENSE for more details
import logging
import hashlib
from slixmpp.basexmpp import BaseXMPP
from slixmpp.xmlstream import XMLStream
from slixmpp.xmlstream import ET
from slixmpp.xmlstream.matcher import MatchXPath
from slixmpp.xmlstream.handler import Callback
log = logging.getLogger(__name__)
class ComponentXMPP(BaseXMPP):
"""
Slixmpp'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:`~slixmpp.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=None, plugin_whitelist=None, use_jc_ns=False):
if not plugin_whitelist:
plugin_whitelist = []
if not plugin_config:
plugin_config = {}
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.sessionstarted = False
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):
"""Connect to the server.
: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.
"""
if host is None:
host = self.server_host
if port is None:
port = self.server_port
self.server_name = self.boundjid.host
log.debug("Connecting to %s:%s", host, port)
return XMLStream.connect(self, host=host, port=port,
use_ssl=use_ssl)
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)
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 = bytes('%s%s' % (sid, self.secret), 'utf-8')
handshake = ET.Element('{jabber:component:accept}handshake')
handshake.text = hashlib.sha1(pre_hash).hexdigest().lower()
self.send_xml(handshake)
def _handle_handshake(self, xml):
"""The handshake has been accepted.
:param xml: The reply handshake stanza.
"""
self.session_bind_event.set()
self.sessionstarted = True
self.event('session_bind', self.boundjid)
self.event('session_start')
def _handle_probe(self, pres):
self.roster[pres['to']][pres['from']].handle_probe(pres)
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