304 lines
10 KiB
Python
Executable file
304 lines
10 KiB
Python
Executable file
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# SAT plugin for managing pipes (experimental)
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# Copyright (C) 2009-2019 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 _, D_
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from sat.core.constants import Const as C
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from sat.core import exceptions
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from sat.core.log import getLogger
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log = getLogger(__name__)
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from sat.tools import xml_tools
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from sat.tools import stream
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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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from twisted.internet import protocol
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from twisted.internet import endpoints
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from twisted.internet import reactor
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from twisted.internet import error
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from twisted.internet import interfaces
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from zope import interface
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import errno
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NS_STREAM = "http://salut-a-toi.org/protocol/stream"
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SECURITY_LIMIT = 30
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START_PORT = 8888
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PLUGIN_INFO = {
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C.PI_NAME: "Jingle Stream Plugin",
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C.PI_IMPORT_NAME: "STREAM",
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C.PI_TYPE: "EXP",
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C.PI_PROTOCOLS: [],
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C.PI_DEPENDENCIES: ["XEP-0166"],
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C.PI_MAIN: "JingleStream",
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C.PI_HANDLER: "no",
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C.PI_DESCRIPTION: _("""Jingle Stream plugin"""),
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}
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CONFIRM = D_(u"{peer} wants to send you a stream, do you accept ?")
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CONFIRM_TITLE = D_(u"Stream Request")
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class StreamProtocol(protocol.Protocol):
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def __init__(self):
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self.pause = False
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def setPause(self, paused):
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# in Python 2.x, Twisted classes are old style
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# so we can use property and setter
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if paused:
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if not self.pause:
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self.transport.pauseProducing()
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self.pause = True
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else:
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if self.pause:
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self.transport.resumeProducing()
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self.pause = False
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def disconnect(self):
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self.transport.loseConnection()
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def connectionMade(self):
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if self.factory.client_conn is not None:
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self.transport.loseConnection()
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self.factory.setClientConn(self)
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def dataReceived(self, data):
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self.factory.writeToConsumer(data)
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def sendData(self, data):
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self.transport.write(data)
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def connectionLost(self, reason):
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if self.factory.client_conn != self:
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# only the first connected client_conn is relevant
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return
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if reason.type == error.ConnectionDone:
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self.factory.streamFinished()
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else:
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self.factory.streamFailed(reason)
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@interface.implementer(stream.IStreamProducer)
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@interface.implementer(interfaces.IPushProducer)
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@interface.implementer(interfaces.IConsumer)
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class StreamFactory(protocol.Factory):
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protocol = StreamProtocol
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consumer = None
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producer = None
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deferred = None
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def __init__(self):
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self.client_conn = None
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def setClientConn(self, stream_protocol):
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# in Python 2.x, Twisted classes are old style
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# so we can use property and setter
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assert self.client_conn is None
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self.client_conn = stream_protocol
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if self.consumer is None:
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self.client_conn.setPause(True)
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def startStream(self, consumer):
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if self.consumer is not None:
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raise exceptions.InternalError(
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_(u"stream can't be used with multiple consumers")
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)
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assert self.deferred is None
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self.consumer = consumer
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consumer.registerProducer(self, True)
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self.deferred = defer.Deferred()
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if self.client_conn is not None:
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self.client_conn.setPause(False)
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return self.deferred
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def streamFinished(self):
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self.client_conn = None
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if self.consumer:
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self.consumer.unregisterProducer()
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self.port_listening.stopListening()
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self.deferred.callback(None)
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def streamFailed(self, failure_):
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self.client_conn = None
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if self.consumer:
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self.consumer.unregisterProducer()
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self.port_listening.stopListening()
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self.deferred.errback(failure_)
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elif self.producer:
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self.producer.stopProducing()
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def stopStream(self):
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if self.client_conn is not None:
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self.client_conn.disconnect()
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def registerProducer(self, producer, streaming):
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self.producer = producer
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def pauseProducing(self):
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self.client_conn.setPause(True)
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def resumeProducing(self):
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self.client_conn.setPause(False)
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def stopProducing(self):
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if self.client_conn:
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self.client_conn.disconnect()
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def write(self, data):
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try:
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self.client_conn.sendData(data)
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except AttributeError:
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log.warning(_(u"No client connected, can't send data"))
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def writeToConsumer(self, data):
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self.consumer.write(data)
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class JingleStream(object):
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"""This non standard jingle application send byte stream"""
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def __init__(self, host):
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log.info(_("Plugin Stream initialization"))
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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._j.registerApplication(NS_STREAM, self)
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host.bridge.addMethod(
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"streamOut",
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".plugin",
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in_sign="ss",
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out_sign="s",
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method=self._streamOut,
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async=True,
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)
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# jingle callbacks
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def _streamOut(self, to_jid_s, profile_key):
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client = self.host.getClient(profile_key)
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return self.streamOut(client, jid.JID(to_jid_s))
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@defer.inlineCallbacks
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def streamOut(self, client, to_jid):
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"""send a stream
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@param peer_jid(jid.JID): recipient
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@return: an unique id to identify the transfer
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"""
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port = START_PORT
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factory = StreamFactory()
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while True:
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endpoint = endpoints.TCP4ServerEndpoint(reactor, port)
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try:
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port_listening = yield endpoint.listen(factory)
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except error.CannotListenError as e:
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if e.socketError.errno == errno.EADDRINUSE:
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port += 1
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else:
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raise e
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else:
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factory.port_listening = port_listening
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break
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self._j.initiate(
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client,
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to_jid,
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[
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{
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"app_ns": NS_STREAM,
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"senders": self._j.ROLE_INITIATOR,
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"app_kwargs": {"stream_object": factory},
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}
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],
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)
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defer.returnValue(unicode(port))
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def jingleSessionInit(self, client, session, content_name, stream_object):
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content_data = session["contents"][content_name]
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application_data = content_data["application_data"]
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assert "stream_object" not in application_data
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application_data["stream_object"] = stream_object
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desc_elt = domish.Element((NS_STREAM, "description"))
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return desc_elt
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@defer.inlineCallbacks
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def jingleRequestConfirmation(self, client, action, session, content_name, desc_elt):
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"""This method request confirmation for a jingle session"""
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content_data = session["contents"][content_name]
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if content_data["senders"] not in (
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self._j.ROLE_INITIATOR,
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self._j.ROLE_RESPONDER,
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):
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log.warning(u"Bad sender, assuming initiator")
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content_data["senders"] = self._j.ROLE_INITIATOR
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confirm_data = yield xml_tools.deferDialog(
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self.host,
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_(CONFIRM).format(peer=session["peer_jid"].full()),
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_(CONFIRM_TITLE),
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type_=C.XMLUI_DIALOG_CONFIRM,
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action_extra={
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"meta_from_jid": session["peer_jid"].full(),
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"meta_type": "STREAM",
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},
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security_limit=SECURITY_LIMIT,
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profile=client.profile,
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)
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if not C.bool(confirm_data["answer"]):
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defer.returnValue(False)
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try:
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port = int(confirm_data["port"])
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except (ValueError, KeyError):
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raise exceptions.DataError(_(u"given port is invalid"))
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endpoint = endpoints.TCP4ClientEndpoint(reactor, "localhost", port)
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factory = StreamFactory()
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yield endpoint.connect(factory)
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content_data["stream_object"] = factory
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finished_d = content_data["finished_d"] = defer.Deferred()
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args = [client, session, content_name, content_data]
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finished_d.addCallbacks(self._finishedCb, self._finishedEb, args, None, args)
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defer.returnValue(True)
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def jingleHandler(self, client, action, session, content_name, desc_elt):
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content_data = session["contents"][content_name]
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application_data = content_data["application_data"]
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if action in (self._j.A_ACCEPTED_ACK, self._j.A_SESSION_INITIATE):
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pass
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elif action == self._j.A_SESSION_ACCEPT:
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assert not "stream_object" in content_data
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content_data["stream_object"] = application_data["stream_object"]
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finished_d = content_data["finished_d"] = defer.Deferred()
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args = [client, session, content_name, content_data]
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finished_d.addCallbacks(self._finishedCb, self._finishedEb, args, None, args)
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else:
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log.warning(u"FIXME: unmanaged action {}".format(action))
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return desc_elt
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def _finishedCb(self, __, client, session, content_name, content_data):
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log.info(u"Pipe transfer completed")
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self._j.contentTerminate(client, session, content_name)
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content_data["stream_object"].stopStream()
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def _finishedEb(self, failure, client, session, content_name, content_data):
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log.warning(u"Error while streaming pipe: {}".format(failure))
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self._j.contentTerminate(
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client, session, content_name, reason=self._j.REASON_FAILED_TRANSPORT
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)
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content_data["stream_object"].stopStream()
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