442 lines
16 KiB
Python
442 lines
16 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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from __future__ import absolute_import, unicode_literals
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import logging
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import base64
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import sys
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import hashlib
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import random
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import threading
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from sleekxmpp import plugins
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from sleekxmpp import stanza
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from sleekxmpp.basexmpp import BaseXMPP
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from sleekxmpp.stanza import Message, Presence, Iq
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from sleekxmpp.xmlstream import XMLStream, RestartStream
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from sleekxmpp.xmlstream import StanzaBase, ET
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from sleekxmpp.xmlstream.matcher import *
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from sleekxmpp.xmlstream.handler import *
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# Flag indicating if DNS SRV records are available for use.
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SRV_SUPPORT = True
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try:
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import dns.resolver
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except:
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SRV_SUPPORT = False
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log = logging.getLogger(__name__)
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class ClientXMPP(BaseXMPP):
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"""
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SleekXMPP's client class.
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Use only for good, not for evil.
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Attributes:
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Methods:
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connect -- Overrides XMLStream.connect.
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del_roster_item -- Delete a roster item.
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get_roster -- Retrieve the roster from the server.
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register_feature -- Register a stream feature.
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update_roster -- Update a roster item.
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"""
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def __init__(self, jid, password, ssl=False, plugin_config={},
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plugin_whitelist=[], escape_quotes=True):
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"""
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Create a new SleekXMPP client.
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Arguments:
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jid -- The JID of the XMPP user account.
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password -- The password for the XMPP user account.
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ssl -- Deprecated.
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plugin_config -- A dictionary of plugin configurations.
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plugin_whitelist -- A list of approved plugins that will be loaded
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when calling register_plugins.
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escape_quotes -- Deprecated.
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"""
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BaseXMPP.__init__(self, 'jabber:client')
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self.set_jid(jid)
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self.password = password
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self.escape_quotes = escape_quotes
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self.plugin_config = plugin_config
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self.plugin_whitelist = plugin_whitelist
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self.srv_support = SRV_SUPPORT
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self.session_started_event = threading.Event()
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self.session_started_event.clear()
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self.stream_header = "<stream:stream to='%s' %s %s version='1.0'>" % (
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self.boundjid.host,
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"xmlns:stream='%s'" % self.stream_ns,
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"xmlns='%s'" % self.default_ns)
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self.stream_footer = "</stream:stream>"
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self.features = []
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self.registered_features = []
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#TODO: Use stream state here
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self.authenticated = False
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self.sessionstarted = False
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self.bound = False
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self.bindfail = False
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self.add_event_handler('connected', self.handle_connected)
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self.register_handler(
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Callback('Stream Features',
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MatchXPath('{%s}features' % self.stream_ns),
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self._handle_stream_features))
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self.register_handler(
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Callback('Roster Update',
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MatchXPath('{%s}iq/{%s}query' % (
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self.default_ns,
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'jabber:iq:roster')),
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self._handle_roster))
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self.register_feature(
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"<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls' />",
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self._handle_starttls, True)
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self.register_feature(
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"<mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl' />",
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self._handle_sasl_auth, True)
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self.register_feature(
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"<bind xmlns='urn:ietf:params:xml:ns:xmpp-bind' />",
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self._handle_bind_resource)
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self.register_feature(
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"<session xmlns='urn:ietf:params:xml:ns:xmpp-session' />",
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self._handle_start_session)
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def handle_connected(self, event=None):
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#TODO: Use stream state here
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self.authenticated = False
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self.sessionstarted = False
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self.bound = False
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self.bindfail = False
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self.schedule("session timeout checker", 15,
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self._session_timeout_check)
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def _session_timeout_check(self):
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if not self.session_started_event.isSet():
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log.debug("Session start has taken more than 15 seconds")
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self.disconnect(reconnect=self.auto_reconnect)
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def connect(self, address=tuple(), reattempt=True):
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"""
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Connect to the XMPP server.
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When no address is given, a SRV lookup for the server will
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be attempted. If that fails, the server user in the JID
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will be used.
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Arguments:
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address -- A tuple containing the server's host and port.
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reattempt -- If True, reattempt the connection if an
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error occurs.
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"""
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self.session_started_event.clear()
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if not address or len(address) < 2:
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if not self.srv_support:
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log.debug("Did not supply (address, port) to connect" + \
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" to and no SRV support is installed" + \
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" (http://www.dnspython.org)." + \
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" Continuing to attempt connection, using" + \
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" server hostname from JID.")
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else:
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log.debug("Since no address is supplied," + \
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"attempting SRV lookup.")
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try:
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xmpp_srv = "_xmpp-client._tcp.%s" % self.boundjid.host
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answers = dns.resolver.query(xmpp_srv, dns.rdatatype.SRV)
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except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
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log.debug("No appropriate SRV record found." + \
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" Using JID server name.")
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except (dns.exception.Timeout,):
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log.debug("DNS resolution timed out.")
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else:
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# Pick a random server, weighted by priority.
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addresses = {}
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intmax = 0
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for answer in answers:
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intmax += answer.priority
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addresses[intmax] = (answer.target.to_text()[:-1],
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answer.port)
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#python3 returns a generator for dictionary keys
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priorities = [x for x in addresses.keys()]
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priorities.sort()
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picked = random.randint(0, intmax)
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for priority in priorities:
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if picked <= priority:
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address = addresses[priority]
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break
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if not address:
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# If all else fails, use the server from the JID.
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address = (self.boundjid.host, 5222)
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return XMLStream.connect(self, address[0], address[1],
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use_tls=True, reattempt=reattempt)
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def register_feature(self, mask, pointer, breaker=False):
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"""
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Register a stream feature.
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Arguments:
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mask -- An XML string matching the feature's element.
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pointer -- The function to execute if the feature is received.
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breaker -- Indicates if feature processing should halt with
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this feature. Defaults to False.
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"""
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self.registered_features.append((MatchXMLMask(mask),
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pointer,
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breaker))
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def update_roster(self, jid, name=None, subscription=None, groups=[]):
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"""
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Add or change a roster item.
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Arguments:
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jid -- The JID of the entry to modify.
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name -- The user's nickname for this JID.
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subscription -- The subscription status. May be one of
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'to', 'from', 'both', or 'none'. If set
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to 'remove', the entry will be deleted.
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groups -- The roster groups that contain this item.
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"""
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iq = self.Iq()._set_stanza_values({'type': 'set'})
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iq['roster']['items'] = {jid: {'name': name,
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'subscription': subscription,
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'groups': groups}}
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response = iq.send()
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return response['type'] == 'result'
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def del_roster_item(self, jid):
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"""
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Remove an item from the roster by setting its subscription
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status to 'remove'.
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Arguments:
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jid -- The JID of the item to remove.
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"""
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return self.update_roster(jid, subscription='remove')
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def get_roster(self):
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"""Request the roster from the server."""
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iq = self.Iq()._set_stanza_values({'type': 'get'}).enable('roster')
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response = iq.send()
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self._handle_roster(response, request=True)
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def _handle_stream_features(self, features):
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"""
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Process the received stream features.
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Arguments:
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features -- The features stanza.
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"""
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# Record all of the features.
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self.features = []
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for sub in features.xml:
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self.features.append(sub.tag)
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# Process the features.
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for sub in features.xml:
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for feature in self.registered_features:
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mask, handler, halt = feature
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if mask.match(sub):
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if handler(sub) and halt:
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# Don't continue if the feature was
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# marked as a breaker.
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return True
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def _handle_starttls(self, xml):
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"""
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Handle notification that the server supports TLS.
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Arguments:
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xml -- The STARTLS proceed element.
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"""
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if not self.authenticated and self.ssl_support:
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tls_ns = 'urn:ietf:params:xml:ns:xmpp-tls'
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self.add_handler("<proceed xmlns='%s' />" % tls_ns,
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self._handle_tls_start,
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name='TLS Proceed',
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instream=True)
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self.send_xml(xml)
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return True
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else:
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log.warning("The module tlslite is required to log in" +\
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" to some servers, and has not been found.")
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return False
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def _handle_tls_start(self, xml):
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"""
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Handle encrypting the stream using TLS.
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Restarts the stream.
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"""
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log.debug("Starting TLS")
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if self.start_tls():
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raise RestartStream()
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def _handle_sasl_auth(self, xml):
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"""
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Handle authenticating using SASL.
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Arguments:
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xml -- The SASL mechanisms stanza.
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"""
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if '{urn:ietf:params:xml:ns:xmpp-tls}starttls' in self.features:
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return False
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log.debug("Starting SASL Auth")
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sasl_ns = 'urn:ietf:params:xml:ns:xmpp-sasl'
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self.add_handler("<success xmlns='%s' />" % sasl_ns,
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self._handle_auth_success,
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name='SASL Sucess',
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instream=True)
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self.add_handler("<failure xmlns='%s' />" % sasl_ns,
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self._handle_auth_fail,
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name='SASL Failure',
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instream=True)
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sasl_mechs = xml.findall('{%s}mechanism' % sasl_ns)
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if sasl_mechs:
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for sasl_mech in sasl_mechs:
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self.features.append("sasl:%s" % sasl_mech.text)
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if 'sasl:PLAIN' in self.features and self.boundjid.user:
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if sys.version_info < (3, 0):
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user = bytes(self.boundjid.user)
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password = bytes(self.password)
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else:
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user = bytes(self.boundjid.user, 'utf-8')
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password = bytes(self.password, 'utf-8')
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auth = base64.b64encode(b'\x00' + user + \
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b'\x00' + password).decode('utf-8')
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self.send("<auth xmlns='%s' mechanism='PLAIN'>%s</auth>" % (
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sasl_ns,
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auth))
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elif 'sasl:ANONYMOUS' in self.features and not self.boundjid.user:
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self.send("<auth xmlns='%s' mechanism='%s' />" % (
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sasl_ns,
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'ANONYMOUS'))
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else:
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log.error("No appropriate login method.")
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self.disconnect()
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return True
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def _handle_auth_success(self, xml):
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"""
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SASL authentication succeeded. Restart the stream.
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Arguments:
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xml -- The SASL authentication success element.
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"""
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self.authenticated = True
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self.features = []
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raise RestartStream()
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def _handle_auth_fail(self, xml):
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"""
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SASL authentication failed. Disconnect and shutdown.
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Arguments:
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xml -- The SASL authentication failure element.
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"""
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log.info("Authentication failed.")
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self.event("failed_auth", direct=True)
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self.disconnect()
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def _handle_bind_resource(self, xml):
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"""
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Handle requesting a specific resource.
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Arguments:
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xml -- The bind feature element.
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"""
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log.debug("Requesting resource: %s" % self.boundjid.resource)
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xml.clear()
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iq = self.Iq(stype='set')
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if self.boundjid.resource:
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res = ET.Element('resource')
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res.text = self.boundjid.resource
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xml.append(res)
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iq.append(xml)
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response = iq.send()
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bind_ns = 'urn:ietf:params:xml:ns:xmpp-bind'
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self.set_jid(response.xml.find('{%s}bind/{%s}jid' % (bind_ns,
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bind_ns)).text)
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self.bound = True
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log.info("Node set to: %s" % self.boundjid.full)
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session_ns = 'urn:ietf:params:xml:ns:xmpp-session'
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if "{%s}session" % session_ns not in self.features or self.bindfail:
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log.debug("Established Session")
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self.sessionstarted = True
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self.session_started_event.set()
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self.event("session_start")
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def _handle_start_session(self, xml):
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"""
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Handle the start of the session.
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Arguments:
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xml -- The session feature element.
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"""
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if self.authenticated and self.bound:
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iq = self.makeIqSet(xml)
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response = iq.send()
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log.debug("Established Session")
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self.sessionstarted = True
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self.session_started_event.set()
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self.event("session_start")
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else:
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# Bind probably hasn't happened yet.
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self.bindfail = True
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def _handle_roster(self, iq, request=False):
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"""
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Update the roster after receiving a roster stanza.
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Arguments:
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iq -- The roster stanza.
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request -- Indicates if this stanza is a response
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to a request for the roster.
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"""
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if iq['type'] == 'set' or (iq['type'] == 'result' and request):
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for jid in iq['roster']['items']:
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if not jid in self.roster:
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self.roster[jid] = {'groups': [],
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'name': '',
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'subscription': 'none',
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'presence': {},
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'in_roster': True}
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self.roster[jid].update(iq['roster']['items'][jid])
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self.event("roster_update", iq)
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if iq['type'] == 'set':
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iq.reply()
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iq.enable('roster')
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iq.send()
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# To comply with PEP8, method names now use underscores.
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# Deprecated method names are re-mapped for backwards compatibility.
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ClientXMPP.updateRoster = ClientXMPP.update_roster
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ClientXMPP.delRosterItem = ClientXMPP.del_roster_item
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ClientXMPP.getRoster = ClientXMPP.get_roster
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ClientXMPP.registerFeature = ClientXMPP.register_feature
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