gajim-plural/src/common/zeroconf/connection_handlers_zeroconf.py

##
## Copyright (C) 2006 Gajim Team
##
## Contributors for this file:
##	- Yann Leboulanger <asterix@lagaule.org>
##	- Nikos Kouremenos <nkour@jabber.org>
##	- Dimitur Kirov <dkirov@gmail.com>
##	- Travis Shirk <travis@pobox.com>
## - Stefan Bethge <stefan@lanpartei.de> 
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim.  If not, see <http://www.gnu.org/licenses/>.
##

import os
import time
import socket

from calendar import timegm

from common import socks5
import common.xmpp

from common import helpers
from common import gajim
from common.zeroconf import zeroconf
STATUS_LIST = ['offline', 'connecting', 'online', 'chat', 'away', 'xa', 'dnd',
	'invisible']
# kind of events we can wait for an answer
VCARD_PUBLISHED = 'vcard_published'
VCARD_ARRIVED = 'vcard_arrived'
AGENT_REMOVED = 'agent_removed'
HAS_IDLE = True
try:
	import idle
except:
	gajim.log.debug(_('Unable to load idle module'))
	HAS_IDLE = False

from common.stanza_session import EncryptedStanzaSession 

class ConnectionVcard:
	def __init__(self): 
		self.vcard_sha = None 
		self.vcard_shas = {} # sha of contacts 
		self.room_jids = [] # list of gc jids so that vcard are saved in a folder

	def add_sha(self, p, send_caps = True): 
		pass 
	
	def add_caps(self, p):
		pass

	def node_to_dict(self, node):
		dict = {}
		
		for info in node.getChildren():
			name = info.getName()
			if name in ('ADR', 'TEL', 'EMAIL'): # we can have several
				if not dict.has_key(name):
					dict[name] = []
				entry = {}
				for c in info.getChildren():
					 entry[c.getName()] = c.getData()
				dict[name].append(entry)
			elif info.getChildren() == []:
				dict[name] = info.getData()
			else:
				dict[name] = {}
				for c in info.getChildren():
					 dict[name][c.getName()] = c.getData()
		
		return dict

	def save_vcard_to_hd(self, full_jid, card):
		jid, nick = gajim.get_room_and_nick_from_fjid(full_jid)
		puny_jid = helpers.sanitize_filename(jid)
		path = os.path.join(gajim.VCARD_PATH, puny_jid)
		if jid in self.room_jids or os.path.isdir(path):
			# remove room_jid file if needed
			if os.path.isfile(path):
				os.remove(path)
			# create folder if needed
			if not os.path.isdir(path):
				os.mkdir(path, 0700)
			puny_nick = helpers.sanitize_filename(nick)
			path_to_file = os.path.join(gajim.VCARD_PATH, puny_jid, puny_nick)
		else:
			path_to_file = path
		fil = open(path_to_file, 'w')
		fil.write(str(card))
		fil.close()
	
	def get_cached_vcard(self, fjid, is_fake_jid = False):
		'''return the vcard as a dict
		return {} if vcard was too old
		return None if we don't have cached vcard'''
		jid, nick = gajim.get_room_and_nick_from_fjid(fjid)
		puny_jid = helpers.sanitize_filename(jid)
		if is_fake_jid:
			puny_nick = helpers.sanitize_filename(nick)
			path_to_file = os.path.join(gajim.VCARD_PATH, puny_jid, puny_nick)
		else:
			path_to_file = os.path.join(gajim.VCARD_PATH, puny_jid)
		if not os.path.isfile(path_to_file):
			return None
		# We have the vcard cached
		f = open(path_to_file)
		c = f.read()
		f.close()
		card = common.xmpp.Node(node = c)
		vcard = self.node_to_dict(card)
		if vcard.has_key('PHOTO'):
			if not isinstance(vcard['PHOTO'], dict):
				del vcard['PHOTO']
			elif vcard['PHOTO'].has_key('SHA'):
				cached_sha = vcard['PHOTO']['SHA']
				if self.vcard_shas.has_key(jid) and self.vcard_shas[jid] != \
					cached_sha:
					# user change his vcard so don't use the cached one
					return {}
		vcard['jid'] = jid
		vcard['resource'] = gajim.get_resource_from_jid(fjid)
		return vcard

	def request_vcard(self, jid = None, is_fake_jid = False):
		pass
		
	def send_vcard(self, vcard):
		pass

class ConnectionBytestream:
	def __init__(self):
		self.files_props = {}
	
	def is_transfer_stopped(self, file_props):
		if file_props.has_key('error') and file_props['error'] != 0:
			return True
		if file_props.has_key('completed') and file_props['completed']:
			return True
		if file_props.has_key('connected') and file_props['connected'] == False:
			return True
		if not file_props.has_key('stopped') or not file_props['stopped']:
			return False
		return True
	
	def send_success_connect_reply(self, streamhost):
		''' send reply to the initiator of FT that we
		made a connection
		'''
		if streamhost is None:
			return None
		iq = common.xmpp.Iq(to = streamhost['initiator'], typ = 'result',
			frm = streamhost['target'])
		iq.setAttr('id', streamhost['id'])
		query = iq.setTag('query')
		query.setNamespace(common.xmpp.NS_BYTESTREAM)
		stream_tag = query.setTag('streamhost-used')
		stream_tag.setAttr('jid', streamhost['jid'])
		self.connection.send(iq)
	
	def remove_transfers_for_contact(self, contact):
		''' stop all active transfer for contact '''
		for file_props in self.files_props.values():
			if self.is_transfer_stopped(file_props):
				continue
			receiver_jid = unicode(file_props['receiver']).split('/')[0]
			if contact.jid == receiver_jid:
				file_props['error'] = -5
				self.remove_transfer(file_props)
				self.dispatch('FILE_REQUEST_ERROR', (contact.jid, file_props, ''))
			sender_jid = unicode(file_props['sender'])
			if contact.jid == sender_jid:
				file_props['error'] = -3
				self.remove_transfer(file_props)
	
	def remove_all_transfers(self):
		''' stops and removes all active connections from the socks5 pool '''
		for file_props in self.files_props.values():
			self.remove_transfer(file_props, remove_from_list = False)
		del(self.files_props)
		self.files_props = {}
	
	def remove_transfer(self, file_props, remove_from_list = True):
		if file_props is None:
			return
		self.disconnect_transfer(file_props)
		sid = file_props['sid']
		gajim.socks5queue.remove_file_props(self.name, sid)

		if remove_from_list:
			if self.files_props.has_key('sid'):
				del(self.files_props['sid'])
	
	def disconnect_transfer(self, file_props):
		if file_props is None:
			return
		if file_props.has_key('hash'):
			gajim.socks5queue.remove_sender(file_props['hash'])

		if file_props.has_key('streamhosts'):
			for host in file_props['streamhosts']:
				if host.has_key('idx') and host['idx'] > 0:
					gajim.socks5queue.remove_receiver(host['idx'])
					gajim.socks5queue.remove_sender(host['idx'])
	
	def send_socks5_info(self, file_props, fast = True, receiver = None,
		sender = None):
		''' send iq for the present streamhosts and proxies '''
		if type(self.peerhost) != tuple:
			return
		port = gajim.config.get('file_transfers_port')
		ft_add_hosts_to_send = gajim.config.get('ft_add_hosts_to_send')
		if receiver is None:
			receiver = file_props['receiver']
		if sender is None:
			sender = file_props['sender']
		proxyhosts = []
		sha_str = helpers.get_auth_sha(file_props['sid'], sender,
			receiver)
		file_props['sha_str'] = sha_str
		ft_add_hosts = []
		if ft_add_hosts_to_send:
			ft_add_hosts_to_send = map(lambda e:e.strip(),
				ft_add_hosts_to_send.split(','))
			for ft_host in ft_add_hosts_to_send:
				try:
					ft_host = socket.gethostbyname(ft_host)
					ft_add_hosts.append(ft_host)
				except socket.gaierror:
					self.dispatch('ERROR', (_('Wrong host'), _('The host %s you configured as the ft_add_hosts_to_send advanced option is not valid, so ignored.') % ft_host))
		listener = gajim.socks5queue.start_listener(port,
			sha_str, self._result_socks5_sid, file_props['sid'])
		if listener == None:
			file_props['error'] = -5
			self.dispatch('FILE_REQUEST_ERROR', (unicode(receiver), file_props,
				''))
			self._connect_error(unicode(receiver), file_props['sid'],
				file_props['sid'], code = 406)
			return

		iq = common.xmpp.Protocol(name = 'iq', to = unicode(receiver),
			typ = 'set')
		file_props['request-id'] = 'id_' + file_props['sid']
		iq.setID(file_props['request-id'])
		query = iq.setTag('query')
		query.setNamespace(common.xmpp.NS_BYTESTREAM)
		query.setAttr('mode', 'tcp')
		query.setAttr('sid', file_props['sid'])
		for ft_host in ft_add_hosts:
			# The streamhost, if set
			ostreamhost = common.xmpp.Node(tag = 'streamhost')
			query.addChild(node = ostreamhost)
			ostreamhost.setAttr('port', unicode(port))
			ostreamhost.setAttr('host', ft_host)
			ostreamhost.setAttr('jid', sender)
		for thehost in self.peerhost:
			thehost = self.peerhost[0]
			streamhost = common.xmpp.Node(tag = 'streamhost') # My IP
			query.addChild(node = streamhost)
			streamhost.setAttr('port', unicode(port))
			streamhost.setAttr('host', thehost)
			streamhost.setAttr('jid', sender)
		self.connection.send(iq)

	def send_file_rejection(self, file_props):
		''' informs sender that we refuse to download the file '''
		# user response to ConfirmationDialog may come after we've disconneted
		if not self.connection or self.connected < 2:
			return
		iq = common.xmpp.Protocol(name = 'iq',
			to = unicode(file_props['sender']), typ = 'error')
		iq.setAttr('id', file_props['request-id'])
		err = common.xmpp.ErrorNode(code = '403', typ = 'cancel', name =
			'forbidden', text = 'Offer Declined')
		iq.addChild(node=err)
		self.connection.send(iq)

	def send_file_approval(self, file_props):
		''' send iq, confirming that we want to download the file '''
		# user response to ConfirmationDialog may come after we've disconneted
		if not self.connection or self.connected < 2:
			return
		iq = common.xmpp.Protocol(name = 'iq',
			to = unicode(file_props['sender']), typ = 'result')
		iq.setAttr('id', file_props['request-id'])
		si = iq.setTag('si')
		si.setNamespace(common.xmpp.NS_SI)
		if file_props.has_key('offset') and file_props['offset']:
			file_tag = si.setTag('file')
			file_tag.setNamespace(common.xmpp.NS_FILE)
			range_tag = file_tag.setTag('range')
			range_tag.setAttr('offset', file_props['offset'])
		feature = si.setTag('feature')
		feature.setNamespace(common.xmpp.NS_FEATURE)
		_feature = common.xmpp.DataForm(typ='submit')
		feature.addChild(node=_feature)
		field = _feature.setField('stream-method')
		field.delAttr('type')
		field.setValue(common.xmpp.NS_BYTESTREAM)
		self.connection.send(iq)

	def send_file_request(self, file_props):
		''' send iq for new FT request '''
		if not self.connection or self.connected < 2:
			return
		our_jid = gajim.get_jid_from_account(self.name)
		frm = our_jid
		file_props['sender'] = frm
		fjid = file_props['receiver'].jid 
		iq = common.xmpp.Protocol(name = 'iq', to = fjid,
			typ = 'set')
		iq.setID(file_props['sid'])
		self.files_props[file_props['sid']] = file_props
		si = iq.setTag('si')
		si.setNamespace(common.xmpp.NS_SI)
		si.setAttr('profile', common.xmpp.NS_FILE)
		si.setAttr('id', file_props['sid'])
		file_tag = si.setTag('file')
		file_tag.setNamespace(common.xmpp.NS_FILE)
		file_tag.setAttr('name', file_props['name'])
		file_tag.setAttr('size', file_props['size'])
		desc = file_tag.setTag('desc')
		if file_props.has_key('desc'):
			desc.setData(file_props['desc'])
		file_tag.setTag('range')
		feature = si.setTag('feature')
		feature.setNamespace(common.xmpp.NS_FEATURE)
		_feature = common.xmpp.DataForm(typ='form')
		feature.addChild(node=_feature)
		field = _feature.setField('stream-method')
		field.setAttr('type', 'list-single')
		field.addOption(common.xmpp.NS_BYTESTREAM)
		self.connection.send(iq)
	
	def _result_socks5_sid(self, sid, hash_id):
		''' store the result of sha message from auth. '''
		if not self.files_props.has_key(sid):
			return
		file_props = self.files_props[sid]
		file_props['hash'] = hash_id
		return
	
	def _connect_error(self, to, _id, sid, code = 404):
		''' cb, when there is an error establishing BS connection, or 
		when connection is rejected'''
		msg_dict = {
			404: 'Could not connect to given hosts',
			405: 'Cancel',
			406: 'Not acceptable',
		}
		msg = msg_dict[code]
		iq = None
		iq = common.xmpp.Protocol(name = 'iq', to = to,
			typ = 'error')
		iq.setAttr('id', _id)
		err = iq.setTag('error')
		err.setAttr('code', unicode(code))
		err.setData(msg)
		self.connection.send(iq)
		if code == 404:
			file_props = gajim.socks5queue.get_file_props(self.name, sid)
			if file_props is not None:
				self.disconnect_transfer(file_props)
				file_props['error'] = -3
				self.dispatch('FILE_REQUEST_ERROR', (to, file_props, msg))

	def _proxy_auth_ok(self, proxy):
		'''cb, called after authentication to proxy server '''
		file_props = self.files_props[proxy['sid']]
		iq = common.xmpp.Protocol(name = 'iq', to = proxy['initiator'],
		typ = 'set')
		auth_id = "au_" + proxy['sid']
		iq.setID(auth_id)
		query = iq.setTag('query')
		query.setNamespace(common.xmpp.NS_BYTESTREAM)
		query.setAttr('sid',  proxy['sid'])
		activate = query.setTag('activate')
		activate.setData(file_props['proxy_receiver'])
		iq.setID(auth_id)
		self.connection.send(iq)
	
	# register xmpppy handlers for bytestream and FT stanzas
	def _bytestreamErrorCB(self, con, iq_obj):
		gajim.log.debug('_bytestreamErrorCB')
		id = unicode(iq_obj.getAttr('id'))
		frm = unicode(iq_obj.getFrom())
		query = iq_obj.getTag('query')
		gajim.proxy65_manager.error_cb(frm, query)
		jid = unicode(iq_obj.getFrom())
		id = id[3:]
		if not self.files_props.has_key(id):
			return
		file_props = self.files_props[id]
		file_props['error'] = -4
		self.dispatch('FILE_REQUEST_ERROR', (jid, file_props, ''))
		raise common.xmpp.NodeProcessed
	
	def _bytestreamSetCB(self, con, iq_obj):
		gajim.log.debug('_bytestreamSetCB')
		target = unicode(iq_obj.getAttr('to'))
		id = unicode(iq_obj.getAttr('id'))
		query = iq_obj.getTag('query')
		sid = unicode(query.getAttr('sid'))
		file_props = gajim.socks5queue.get_file_props(
			self.name, sid)
		streamhosts=[]
		for item in query.getChildren():
			if item.getName() == 'streamhost':
				host_dict={
					'state': 0,
					'target': target,
					'id': id,
					'sid': sid,
					'initiator': unicode(iq_obj.getFrom())
				}
				for attr in item.getAttrs():
					host_dict[attr] = item.getAttr(attr)
				streamhosts.append(host_dict)
		if file_props is None:
			if self.files_props.has_key(sid):
				file_props = self.files_props[sid]
				file_props['fast'] = streamhosts
				if file_props['type'] == 's': 
					if file_props.has_key('streamhosts'):
						file_props['streamhosts'].extend(streamhosts)
					else:
						file_props['streamhosts'] = streamhosts
					if not gajim.socks5queue.get_file_props(self.name, sid):
						gajim.socks5queue.add_file_props(self.name, file_props)
					gajim.socks5queue.connect_to_hosts(self.name, sid,
						self.send_success_connect_reply, None)
				raise common.xmpp.NodeProcessed

		file_props['streamhosts'] = streamhosts
		if file_props['type'] == 'r':
			gajim.socks5queue.connect_to_hosts(self.name, sid,
				self.send_success_connect_reply, self._connect_error)
		raise common.xmpp.NodeProcessed

	def _ResultCB(self, con, iq_obj):
		gajim.log.debug('_ResultCB')
		# if we want to respect jep-0065 we have to check for proxy
		# activation result in any result iq
		real_id = unicode(iq_obj.getAttr('id'))
		if real_id[:3] != 'au_':
			return
		frm = unicode(iq_obj.getFrom())
		id = real_id[3:]
		if self.files_props.has_key(id):
			file_props = self.files_props[id]
			if file_props['streamhost-used']:
				for host in file_props['proxyhosts']:
					if host['initiator'] == frm and host.has_key('idx'):
						gajim.socks5queue.activate_proxy(host['idx'])
						raise common.xmpp.NodeProcessed
	
	def _bytestreamResultCB(self, con, iq_obj):
		gajim.log.debug('_bytestreamResultCB')
		frm = unicode(iq_obj.getFrom())
		real_id = unicode(iq_obj.getAttr('id'))
		query = iq_obj.getTag('query')
		gajim.proxy65_manager.resolve_result(frm, query)
		
		try:
			streamhost =  query.getTag('streamhost-used')
		except: # this bytestream result is not what we need
			pass
		id = real_id[3:]
		if self.files_props.has_key(id):
			file_props = self.files_props[id]
		else:
			raise common.xmpp.NodeProcessed
		if streamhost is None:
			# proxy approves the activate query
			if real_id[:3] == 'au_':
				id = real_id[3:]
				if not file_props.has_key('streamhost-used') or \
					file_props['streamhost-used'] is False:
					raise common.xmpp.NodeProcessed
				if not file_props.has_key('proxyhosts'):
					raise common.xmpp.NodeProcessed
				for host in file_props['proxyhosts']:
					if host['initiator'] == frm and \
					unicode(query.getAttr('sid')) == file_props['sid']:
						gajim.socks5queue.activate_proxy(host['idx'])
						break
			raise common.xmpp.NodeProcessed
		jid = streamhost.getAttr('jid')
		if file_props.has_key('streamhost-used') and \
			file_props['streamhost-used'] is True:
			raise common.xmpp.NodeProcessed

		if real_id[:3] == 'au_':
			gajim.socks5queue.send_file(file_props, self.name)
			raise common.xmpp.NodeProcessed

		proxy = None
		if file_props.has_key('proxyhosts'):
			for proxyhost in file_props['proxyhosts']:
				if proxyhost['jid'] == jid:
					proxy = proxyhost

		if proxy != None:
			file_props['streamhost-used'] = True
			if not file_props.has_key('streamhosts'):
				file_props['streamhosts'] = []
			file_props['streamhosts'].append(proxy)
			file_props['is_a_proxy'] = True
			receiver = socks5.Socks5Receiver(gajim.idlequeue, proxy, file_props['sid'], file_props)
			gajim.socks5queue.add_receiver(self.name, receiver)
			proxy['idx'] = receiver.queue_idx
			gajim.socks5queue.on_success = self._proxy_auth_ok
			raise common.xmpp.NodeProcessed

		else:
			gajim.socks5queue.send_file(file_props, self.name)
			if file_props.has_key('fast'):
				fasts = file_props['fast']
				if len(fasts) > 0:
					self._connect_error(frm, fasts[0]['id'], file_props['sid'],
						code = 406)
		
		raise common.xmpp.NodeProcessed
	
	def _siResultCB(self, con, iq_obj):
		gajim.log.debug('_siResultCB')
		self.peerhost = con._owner.Connection._sock.getsockname()
		id = iq_obj.getAttr('id')
		if not self.files_props.has_key(id):
			# no such jid
			return
		file_props = self.files_props[id]
		if file_props is None:
			# file properties for jid is none
			return
		if file_props.has_key('request-id'):
			# we have already sent streamhosts info
			return
		file_props['receiver'] = unicode(iq_obj.getFrom())
		si = iq_obj.getTag('si')
		file_tag = si.getTag('file')
		range_tag = None
		if file_tag:
			range_tag = file_tag.getTag('range')
		if range_tag:
			offset = range_tag.getAttr('offset')
			if offset:
				file_props['offset'] = int(offset)
			length = range_tag.getAttr('length')
			if length:
				file_props['length'] = int(length)
		feature = si.setTag('feature')
		if feature.getNamespace() != common.xmpp.NS_FEATURE:
			return
		form_tag = feature.getTag('x')
		form = common.xmpp.DataForm(node=form_tag)
		field = form.getField('stream-method')
		if field.getValue() != common.xmpp.NS_BYTESTREAM:
			return
		self.send_socks5_info(file_props, fast = True)
		raise common.xmpp.NodeProcessed
	
	def _siSetCB(self, con, iq_obj):
		gajim.log.debug('_siSetCB')
		jid = unicode(iq_obj.getFrom())
		si = iq_obj.getTag('si')
		profile = si.getAttr('profile')
		mime_type = si.getAttr('mime-type')
		if profile != common.xmpp.NS_FILE:
			return
		file_tag = si.getTag('file')
		file_props = {'type': 'r'}
		for attribute in file_tag.getAttrs():
			if attribute in ('name', 'size', 'hash', 'date'):
				val = file_tag.getAttr(attribute)
				if val is None:
					continue
				file_props[attribute] = val
		file_desc_tag = file_tag.getTag('desc')
		if file_desc_tag is not None:
			file_props['desc'] = file_desc_tag.getData()

		if mime_type is not None:
			file_props['mime-type'] = mime_type
		our_jid = gajim.get_jid_from_account(self.name)
		file_props['receiver'] = our_jid 
		file_props['sender'] = unicode(iq_obj.getFrom())
		file_props['request-id'] = unicode(iq_obj.getAttr('id'))
		file_props['sid'] = unicode(si.getAttr('id'))
		file_props['transfered_size'] = []
		gajim.socks5queue.add_file_props(self.name, file_props)
		self.dispatch('FILE_REQUEST', (jid, file_props))
		raise common.xmpp.NodeProcessed

	def _siErrorCB(self, con, iq_obj):
		gajim.log.debug('_siErrorCB')
		si = iq_obj.getTag('si')
		profile = si.getAttr('profile')
		if profile != common.xmpp.NS_FILE:
			return
		id = iq_obj.getAttr('id')
		if not self.files_props.has_key(id):
			# no such jid
			return
		file_props = self.files_props[id]
		if file_props is None:
			# file properties for jid is none
			return
		jid = unicode(iq_obj.getFrom())
		file_props['error'] = -3
		self.dispatch('FILE_REQUEST_ERROR', (jid, file_props, ''))
		raise common.xmpp.NodeProcessed

class ConnectionHandlersZeroconf(ConnectionVcard, ConnectionBytestream):
	def __init__(self):
		ConnectionVcard.__init__(self)
		ConnectionBytestream.__init__(self)
		# List of IDs we are waiting answers for {id: (type_of_request, data), }
		self.awaiting_answers = {}
		# List of IDs that will produce a timeout is answer doesn't arrive
		# {time_of_the_timeout: (id, message to send to gui), }
		self.awaiting_timeouts = {}
		# keep the jids we auto added (transports contacts) to not send the
		# SUBSCRIBED event to gui
		self.automatically_added = []
		# keep track of sessions this connection has with other JIDs
		self.sessions = {}
		try:
			idle.init()
		except:
			HAS_IDLE = False
			
	def _messageCB(self, ip, con, msg):
		'''Called when we receive a message'''
		mtype = msg.getType()
		thread_id = msg.getThread()
		tim = msg.getTimestamp()
		tim = helpers.datetime_tuple(tim)
		tim = time.localtime(timegm(tim))
		frm = msg.getFrom()

		if frm == None:
			for key in self.connection.zeroconf.contacts:
				if ip == self.connection.zeroconf.contacts[key][zeroconf.C_ADDRESS]:
					frm = key
		frm = unicode(frm)
		jid  = frm

		session = self.get_session(frm, thread_id, mtype)

		if thread_id and not session.received_thread_id:
			session.received_thread_id = True
		
		if msg.getTag('feature') and msg.getTag('feature').namespace == \
		common.xmpp.NS_FEATURE:
			if gajim.HAVE_PYCRYPTO:
				self._FeatureNegCB(con, msg, session)
			return
		if msg.getTag('init') and msg.getTag('init').namespace == \
		common.xmpp.NS_ESESSION_INIT:
			self._InitE2ECB(con, msg, session)

		no_log_for = gajim.config.get_per('accounts', self.name,
			'no_log_for').split()
		encrypted = False
		chatstate = None

		e2e_tag = msg.getTag('c', namespace = common.xmpp.NS_STANZA_CRYPTO)
		if e2e_tag:
			encrypted = True

			try:
				msg = session.decrypt_stanza(msg)
			except:
				self.dispatch('FAILED_DECRYPT', (frm, tim))
		
		msgtxt = msg.getBody()
		msghtml = msg.getXHTML()
		subject = msg.getSubject() # if not there, it's None

		encTag = msg.getTag('x', namespace = common.xmpp.NS_ENCRYPTED)
		decmsg = ''
		form_node = msg.getTag('x', namespace = common.xmpp.NS_DATA)
		# invitations
		invite = None
		if not encTag:
			invite = msg.getTag('x', namespace = common.xmpp.NS_MUC_USER)
			if invite and not invite.getTag('invite'):
				invite = None
		delayed = msg.getTag('x', namespace = common.xmpp.NS_DELAY) != None
		msg_id = None
		composing_xep = None
		xtags = msg.getTags('x')
		# chatstates - look for chatstate tags in a message if not delayed
		if not delayed:
			composing_xep = False
			children = msg.getChildren()
			for child in children:
				if child.getNamespace() == 'http://jabber.org/protocol/chatstates':
					chatstate = child.getName()
					composing_xep = 'XEP-0085'
					break
			# No JEP-0085 support, fallback to JEP-0022
			if not chatstate:
				chatstate_child = msg.getTag('x', namespace = common.xmpp.NS_EVENT)
				if chatstate_child:
					chatstate = 'active'
					composing_xep = 'XEP-0022'
					if not msgtxt and chatstate_child.getTag('composing'):
						chatstate = 'composing'
		# JEP-0172 User Nickname
		user_nick = msg.getTagData('nick')
		if not user_nick:
			user_nick = ''

		if encTag and self.USE_GPG:
			#decrypt
			encmsg = encTag.getData()
			
			keyID = gajim.config.get_per('accounts', self.name, 'keyid')
			if keyID:
				decmsg = self.gpg.decrypt(encmsg, keyID)
		if decmsg:
			msgtxt = decmsg
			encrypted = True
		if mtype == 'error':
			error_msg = msg.getError()
			if not error_msg:
				error_msg = msgtxt
				msgtxt = None
			if self.name not in no_log_for:
				gajim.logger.write('error', frm, error_msg, tim = tim,
					subject = subject)
			self.dispatch('MSGERROR', (frm, msg.getErrorCode(), error_msg, msgtxt,
				tim))
		elif mtype == 'chat': # it's type 'chat'
			if not msg.getTag('body') and chatstate is None: #no <body>
				return
			if msg.getTag('body') and self.name not in no_log_for and jid not in\
				no_log_for and msgtxt:
				msg_id = gajim.logger.write('chat_msg_recv', frm, msgtxt, tim = tim,
					subject = subject)
			self.dispatch('MSG', (frm, msgtxt, tim, encrypted, mtype, subject,
				chatstate, msg_id, composing_xep, user_nick, msghtml, session,
				form_node))
		elif mtype == 'normal': # it's single message
			if self.name not in no_log_for and jid not in no_log_for and msgtxt:
				gajim.logger.write('single_msg_recv', frm, msgtxt, tim = tim,
					subject = subject)
			if invite:
				self.dispatch('MSG', (frm, msgtxt, tim, encrypted, 'normal',
					subject, chatstate, msg_id, composing_xep, user_nick, msghtml,
					session, form_node))
	# END messageCB
	
	def _FeatureNegCB(self, con, stanza, session):
		gajim.log.debug('FeatureNegCB')
		feature = stanza.getTag(name='feature', namespace=common.xmpp.NS_FEATURE)
		form = common.xmpp.DataForm(node=feature.getTag('x'))

		if form['FORM_TYPE'] == 'urn:xmpp:ssn':
			self.dispatch('SESSION_NEG', (stanza.getFrom(), session, form))
		else:
			reply = stanza.buildReply()
			reply.setType('error')

			reply.addChild(feature)
			reply.addChild(node=xmpp.ErrorNode('service-unavailable', typ='cancel'))

			con.send(reply)
		
		raise common.xmpp.NodeProcessed

	def _InitE2ECB(self, con, stanza, session):
		gajim.log.debug('InitE2ECB')
		init = stanza.getTag(name='init', namespace=common.xmpp.NS_ESESSION_INIT)
		form = common.xmpp.DataForm(node=init.getTag('x'))

		self.dispatch('SESSION_NEG', (stanza.getFrom(), session, form))

		raise common.xmpp.NodeProcessed

	def get_session(self, jid, thread_id, type):
		'''returns an existing session between this connection and 'jid', returns a new one if none exist.'''
		session = self.find_session(jid, thread_id, type)

		if session:
			return session
		else:
			# it's possible we initiated a session with a bare JID and this is the
			# first time we've seen a resource
			bare_jid = gajim.get_jid_without_resource(jid)
			if bare_jid != jid:
				session = self.find_session(bare_jid, thread_id, type)
				if session:
					if not session.received_thread_id:
						thread_id = session.thread_id

					self.move_session(bare_jid, thread_id, jid.split("/")[1])
					return session

		return self.make_new_session(jid, thread_id, type)

	def find_session(self, jid, thread_id, type):
		try:
			if type == 'chat' and not thread_id:
				return self.find_null_session(jid)
			else:
				return self.sessions[jid][thread_id]
		except KeyError:
			return None

	def delete_session(self, jid, thread_id):
		try:
			del self.sessions[jid][thread_id]
			
			if not self.sessions[jid]:
				del self.sessions[jid]
		except KeyError:
			print "jid %s should have been in %s, but it wasn't. missing session?" % (repr(jid), repr(self.sessions.keys()))

	def move_session(self, original_jid, thread_id, to_resource):
		'''moves a session to another resource.'''
		session = self.sessions[original_jid][thread_id]

		del self.sessions[original_jid][thread_id]

		new_jid = gajim.get_jid_without_resource(original_jid) + '/' + to_resource
		session.jid = common.xmpp.JID(new_jid)

		if not new_jid in self.sessions:
			self.sessions[new_jid] = {}

		self.sessions[new_jid][thread_id] = session

	def find_null_session(self, jid):
		'''finds all of the sessions between us and jid that jid hasn't sent a thread_id in yet.

returns the session that we last sent a message to.'''
		
		sessions_with_jid = self.sessions[jid].values()
		no_threadid_sessions = filter(lambda s: not s.received_thread_id, sessions_with_jid)

		if no_threadid_sessions:
			no_threadid_sessions.sort(key=lambda s: s.last_send)
			return no_threadid_sessions[-1]
		else:
			return None

	def make_new_session(self, jid, thread_id = None, type = 'chat'):
		sess = EncryptedStanzaSession(self, common.xmpp.JID(jid), thread_id, type)

		if not jid in self.sessions:
			self.sessions[jid] = {}

		self.sessions[jid][sess.thread_id] = sess

		return sess

	def parse_data_form(self, node):
		dic = {}
		tag = node.getTag('title')
		if tag:
			dic['title'] = tag.getData()
		tag = node.getTag('instructions')
		if tag:
			dic['instructions'] = tag.getData()
		i = 0
		for child in node.getChildren():
			if child.getName() != 'field':
				continue
			var = child.getAttr('var')
			ctype = child.getAttr('type')
			label = child.getAttr('label')
			if not var and ctype != 'fixed': # We must have var if type != fixed
				continue
			dic[i] = {}
			if var:
				dic[i]['var'] = var
			if ctype:
				dic[i]['type'] = ctype
			if label:
				dic[i]['label'] = label
			tags = child.getTags('value')
			if len(tags):
				dic[i]['values'] = []
				for tag in tags:
					data = tag.getData()
					if ctype == 'boolean':
						if data in ('yes', 'true', 'assent', '1'):
							data = True
						else:
							data = False
					dic[i]['values'].append(data)
			tag = child.getTag('desc')
			if tag:
				dic[i]['desc'] = tag.getData()
			option_tags = child.getTags('option')
			if len(option_tags):
				dic[i]['options'] = {}
				j = 0
				for option_tag in option_tags:
					dic[i]['options'][j] = {}
					label = option_tag.getAttr('label')
					tags = option_tag.getTags('value')
					dic[i]['options'][j]['values'] = []
					for tag in tags:
						dic[i]['options'][j]['values'].append(tag.getData())
					if not label:
						label = dic[i]['options'][j]['values'][0]
					dic[i]['options'][j]['label'] = label
					j += 1
				if not dic[i].has_key('values'):
					dic[i]['values'] = [dic[i]['options'][0]['values'][0]]
			i += 1
		return dic
	
	def store_metacontacts(self, tags):
		''' fake empty method '''
		# serverside metacontacts  are not supported with zeroconf 
		# (there is no server)
		pass

	def remove_transfers_for_contact(self, contact):
		''' stop all active transfer for contact '''
		pass

	def remove_all_transfers(self):
		''' stops and removes all active connections from the socks5 pool '''
		pass

	def remove_transfer(self, file_props, remove_from_list = True):
		pass