315 lines
14 KiB
Python
315 lines
14 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# SAT plugin for Jingle (XEP-0260)
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# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Jérôme Poisson (goffi@goffi.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from sat.core.i18n import _
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from sat.core.log import getLogger
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log = getLogger(__name__)
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from sat.core import exceptions
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from wokkel import disco, iwokkel
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from zope.interface import implements
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from twisted.words.xish import domish
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from twisted.words.protocols.jabber import jid
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from twisted.internet import defer
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import uuid
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try:
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from twisted.words.protocols.xmlstream import XMPPHandler
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except ImportError:
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from wokkel.subprotocols import XMPPHandler
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NS_JINGLE_S5B = 'urn:xmpp:jingle:transports:s5b:1'
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PLUGIN_INFO = {
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"name": "Jingle SOCKS5 Bytestreams",
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"import_name": "XEP-0260",
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"type": "XEP",
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"protocols": ["XEP-0260"],
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"dependencies": ["XEP-0166", "XEP-0065"],
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"main": "XEP_0260",
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"handler": "yes",
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"description": _("""Implementation of Jingle SOCKS5 Bytestreams""")
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}
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class XEP_0260(object):
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# TODO: udp handling
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def __init__(self, host):
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log.info(_("plugin Jingle SOCKS5 Bytestreams"))
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self.host = host
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self._j = host.plugins["XEP-0166"] # shortcut to access jingle
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self._s5b = host.plugins["XEP-0065"] # and socks5 bytestream
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self._j.registerTransport(NS_JINGLE_S5B, self._j.TRANSPORT_STREAMING, self, 100)
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def getHandler(self, profile):
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return XEP_0260_handler()
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def _parseCandidates(self, transport_elt):
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"""Parse <candidate> elements
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@param transport_elt(domish.Element): parent <transport> element
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@return (list[plugin_xep_0065.Candidate): list of parsed candidates
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"""
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candidates = []
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for candidate_elt in transport_elt.elements(NS_JINGLE_S5B, 'candidate'):
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try:
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cid = candidate_elt['cid']
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host = candidate_elt['host']
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jid_= jid.JID(candidate_elt['jid'])
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port = int(candidate_elt.getAttribute('port', 1080))
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priority = int(candidate_elt['priority'])
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type_ = candidate_elt.getAttribute('type', self._s5b.TYPE_DIRECT)
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except (KeyError, ValueError):
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raise exceptions.DataError()
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candidate = self._s5b.Candidate(host, port, type_, priority, jid_, cid)
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candidates.append(candidate)
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# self._s5b.registerCandidate(candidate)
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return candidates
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def _buildCandidates(self, session, candidates, sid, session_hash, client, mode=None):
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"""Build <transport> element with candidates
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@param session(dict): jingle session data
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@param candidates(iterator[plugin_xep_0065.Candidate]): iterator of candidates to add
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@param sid(unicode): transport stream id
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@param client: %(doc_client)s
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@param mode(str, None): 'tcp' or 'udp', or None to have no attribute
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@return (domish.Element): parent <transport> element where <candidate> elements must be added
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"""
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proxy = next((candidate for candidate in candidates if candidate.type == self._s5b.TYPE_PROXY), None)
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transport_elt = domish.Element((NS_JINGLE_S5B, "transport"))
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transport_elt['sid'] = sid
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if proxy is not None:
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transport_elt['dstaddr'] = session_hash
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if mode is not None:
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transport_elt['mode'] = 'tcp' # XXX: we only manage tcp for now
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for candidate in candidates:
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log.debug(u"Adding candidate: {}".format(candidate))
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candidate_elt = transport_elt.addElement('candidate', NS_JINGLE_S5B)
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if candidate.id is None:
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candidate.id = unicode(uuid.uuid4())
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candidate_elt['cid'] = candidate.id
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candidate_elt['host'] = candidate.host
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candidate_elt['jid'] = candidate.jid.full()
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candidate_elt['port'] = unicode(candidate.port)
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candidate_elt['priority'] = unicode(candidate.priority)
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candidate_elt['type'] = candidate.type
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return transport_elt
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@defer.inlineCallbacks
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def jingleSessionInit(self, session, content_name, profile):
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client = self.host.getClient(profile)
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content_data = session['contents'][content_name]
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transport_data = content_data['transport_data']
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sid = transport_data['sid'] = unicode(uuid.uuid4())
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session_hash = transport_data['session_hash'] = self._s5b.getSessionHash(client.jid, session['peer_jid'], sid)
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candidates = transport_data['candidates'] = yield self._s5b.getCandidates(profile)
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mode = 'tcp' # XXX: we only manage tcp for now
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transport_elt = self._buildCandidates(session, candidates, sid, session_hash, client, mode)
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defer.returnValue(transport_elt)
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def _foundPeerCandidate(self, candidate, session, transport_data, content_name, client):
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"""Called when the best candidate from other peer is found
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@param candidate(XEP_0065.Candidate, None): selected candidate,
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or None if no candidate is accessible
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@param session(dict): session data
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@param transport_data(dict): transport data
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@param content_name(dict): name of the current content
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@param client(unicode): %(doc_client)s
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"""
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transport_data['best_candidate'] = candidate
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# we need to disconnect all non selected candidates before removing them
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for c in transport_data['peer_candidates']:
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if c is None or c is candidate:
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continue
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c.discard()
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del transport_data['peer_candidates']
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iq_elt, transport_elt = self._j.buildAction(self._j.A_TRANSPORT_INFO, session, content_name, client.profile)
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if candidate is None:
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log.warning(u"Can't connect to any peer candidate")
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candidate_elt = transport_elt.addElement('candidate-error')
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else:
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log.info(u"Found best peer candidate: {}".format(unicode(candidate)))
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candidate_elt = transport_elt.addElement('candidate-used')
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candidate_elt['cid'] = candidate.id
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iq_elt.send() # TODO: check result stanza
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content_data = session['contents'][content_name]
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self._checkCandidates(session, content_data, transport_data, client)
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def _checkCandidates(self, session, content_data, transport_data, client):
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"""Called when a candidate has been choosed
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if we have both candidates, we select one, or fallback to an other transport
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@param session(dict): session data
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@param content_data(dict): content data
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@param transport_data(dict): transport data
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@param client(unicode): %(doc_client)s
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"""
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try:
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best_candidate = transport_data['best_candidate']
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except KeyError:
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# we have not our best candidate yet
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return
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try:
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peer_best_candidate = transport_data['peer_best_candidate']
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except KeyError:
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# we have not peer best candidate yet
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return
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# at this point we have both candidates, it's time to choose one
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if best_candidate is None or peer_best_candidate is None:
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choosed_candidate = best_candidate or peer_best_candidate
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else:
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if best_candidate.priority == peer_best_candidate.priority:
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# same priority, we choose initiator one according to XEP-0260 §2.4 #4
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log.debug(u"Candidates have same priority, we choose the initiator one")
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if session['initiator'] == client.jid:
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choosed_candidate = best_candidate
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else:
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choosed_candidate = peer_best_candidate
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else:
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choosed_candidate = max(best_candidate, peer_best_candidate, key=lambda c:c.priority)
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if choosed_candidate is None:
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log.warning(u"Socks5 negociation failed, we need to fallback to IBB")
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else:
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if choosed_candidate==best_candidate:
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who = u'our'
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else:
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who = u'other peer'
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best_candidate.discard()
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log.info(u"Socks5 negociation successful, {who} candidate will be used: {candidate}".format(
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who = who,
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candidate = choosed_candidate))
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del transport_data['best_candidate']
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del transport_data['peer_best_candidate']
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if content_data['senders'] == session['role']:
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# we can now start the file transfer
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choosed_candidate.startTransfer(transport_data['session_hash'])
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@defer.inlineCallbacks
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def jingleHandler(self, action, session, content_name, transport_elt, profile):
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client = self.host.getClient(profile)
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content_data = session['contents'][content_name]
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transport_data = content_data['transport_data']
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if action in (self._j.A_ACCEPTED_ACK,):
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pass
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elif action == self._j.A_SESSION_ACCEPT:
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# initiator side, we select a candidate in the ones sent by responder
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assert 'peer_candidates' not in transport_data
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transport_data['peer_candidates'] = self._parseCandidates(transport_elt)
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# elif action == self._j.A_START:
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elif action == self._j.A_START:
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session_hash = transport_data['session_hash']
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peer_candidates = transport_data['peer_candidates']
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file_obj = content_data['file_obj']
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stream_d = self._s5b.registerHash(session_hash, file_obj, profile)
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args = [session, content_name, profile]
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stream_d.addCallbacks(self._streamCb, self._streamEb, args, None, args)
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d = self._s5b.getBestCandidate(peer_candidates, session_hash, profile)
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d.addCallback(self._foundPeerCandidate, session, transport_data, content_name, client)
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elif action == self._j.A_SESSION_INITIATE:
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# responder side, we select a candidate in the ones sent by initiator
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# and we give our candidates
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assert 'peer_candidates' not in transport_data
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sid = transport_data['sid'] = transport_elt['sid']
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session_hash = transport_data['session_hash'] = self._s5b.getSessionHash(session['peer_jid'], client.jid, sid)
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peer_candidates = transport_data['peer_candidates'] = self._parseCandidates(transport_elt)
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file_obj = content_data['file_obj']
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stream_d = self._s5b.registerHash(session_hash, file_obj, profile)
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args = [session, content_name, profile]
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stream_d.addCallbacks(self._streamCb, self._streamEb, args, None, args)
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d = self._s5b.getBestCandidate(peer_candidates, session_hash, profile)
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d.addCallback(self._foundPeerCandidate, session, transport_data, content_name, client)
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candidates = yield self._s5b.getCandidates(profile)
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# we remove duplicate candidates
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candidates = [candidate for candidate in candidates if candidate not in peer_candidates]
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transport_data['candidates'] = candidates
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# we can now build a new <transport> element with our candidates
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transport_elt = self._buildCandidates(session, candidates, sid, session_hash, client)
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elif action == self._j.A_TRANSPORT_INFO:
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# other peer gave us its choosed candidate
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try:
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candidate_elt = transport_elt.elements(NS_JINGLE_S5B, 'candidate-used').next()
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except StopIteration:
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try:
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candidate_elt = transport_elt.elements(NS_JINGLE_S5B, 'candidate-error').next()
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except StopIteration:
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log.warning(u"Unexpected transport element: {}".format(transport_elt.toXml()))
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raise exceptions.DataError
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else:
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# candidate-error, no candidate worked
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transport_data['peer_best_candidate'] = None
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else:
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# candidate-used, one candidate was choosed
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try:
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cid = candidate_elt.attributes['cid']
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except KeyError:
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log.warning(u"No cid found in <candidate-used>")
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raise exceptions.DataError
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try:
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candidate = (c for c in transport_data['candidates'] if c.id == cid).next()
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except StopIteration:
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log.warning(u"Given cid doesn't correspond to any known candidate !")
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raise exceptions.DataError # TODO: send an error to other peer, and use better exception
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except KeyError:
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# a transport-info can also be intentionaly sent too early by other peer
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# but there is little probability
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log.error(u'"candidates" key doesn\'t exists in transport_data, it should at this point')
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raise exceptions.InternalError
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# at this point we have the candidate choosed by other peer
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transport_data['peer_best_candidate'] = candidate
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log.info(u"Other peer best candidate: {}".format(candidate))
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del transport_data['candidates']
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self._checkCandidates(session, content_data, transport_data, client)
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else:
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log.warning(u"FIXME: unmanaged action {}".format(action))
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defer.returnValue(transport_elt)
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def _streamCb(self, dummy, session, content_name, profile):
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self._j.contentTerminate(session, content_name, profile=profile)
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def _streamEb(self, failure, session, content_name, profile):
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log.warning(u"Error while streaming through s5b: {}".format(failure))
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self._j.contentTerminate(session, content_name, reason=self._j.REASON_FAILED_TRANSPORT, profile=profile)
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class XEP_0260_handler(XMPPHandler):
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implements(iwokkel.IDisco)
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def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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return [disco.DiscoFeature(NS_JINGLE_S5B)]
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def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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return []
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