plugin XEP-0047, XEP-0096: In-Band Bystream plugin cleaning:
- some renaming, comments improvments, etc
- progress callback is no more managed here, as it will be managed by application
- no more file data is used, beside file_obj
- a proper Deferred is used instead of success and error callbacks
- more clean error sending method
plugin XEP-0096 has been updated to handle changes. Its temporarily partially broken though
This commit is contained in:
Goffi
parent
0c5ec666c2
commit
7121b58961
1 changed files with 257 additions and 231 deletions
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@ -20,9 +20,14 @@
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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 twisted.words.protocols.jabber import client as jabber_client, jid
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from twisted.words.xish import domish
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from sat.core import exceptions
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from twisted.words.protocols.jabber import client as jabber_client
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from twisted.words.protocols.jabber import jid
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from twisted.words.protocols.jabber import xmlstream
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from twisted.words.protocols.jabber import error
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from twisted.internet import reactor
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from twisted.internet import defer
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from twisted.python import failure
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from wokkel import disco, iwokkel
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@ -39,11 +44,11 @@ MESSAGE = '/message'
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IQ_SET = '/iq[@type="set"]'
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NS_IBB = 'http://jabber.org/protocol/ibb'
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IBB_OPEN = IQ_SET + '/open[@xmlns="' + NS_IBB + '"]'
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IBB_CLOSE = IQ_SET + '/close[@xmlns="' + NS_IBB + '" and @sid="%s"]'
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IBB_IQ_DATA = IQ_SET + '/data[@xmlns="' + NS_IBB + '" and @sid="%s"]'
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IBB_MESSAGE_DATA = MESSAGE + '/data[@xmlns="' + NS_IBB + '" and @sid="%s"]'
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IBB_CLOSE = IQ_SET + '/close[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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IBB_IQ_DATA = IQ_SET + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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IBB_MESSAGE_DATA = MESSAGE + '/data[@xmlns="' + NS_IBB + '" and @sid="{}"]'
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TIMEOUT = 60 # timeout for workflow
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BLOCK_SIZE = 4096
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DEFER_KEY = 'finished' # key of the deferred used to track session end
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PLUGIN_INFO = {
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"name": "In-Band Bytestream Plugin",
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@ -58,6 +63,7 @@ PLUGIN_INFO = {
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class XEP_0047(object):
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NAMESPACE = NS_IBB
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BLOCK_SIZE = 4096
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def __init__(self, host):
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log.info(_("In-Band Bytestreams plugin initialization"))
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@ -70,275 +76,277 @@ class XEP_0047(object):
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client = self.host.getClient(profile)
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client.xep_0047_current_stream = {} # key: stream_id, value: data(dict)
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def _timeOut(self, sid, profile):
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"""Delecte current_stream id, called after timeout
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@param id: id of client.xep_0047_current_stream"""
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log.info(_("In-Band Bytestream: TimeOut reached for id %(sid)s [%(profile)s]")
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% {"sid": sid, "profile": profile})
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self._killId(sid, False, "TIMEOUT", profile)
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def _timeOut(self, sid, client):
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"""Delete current_stream id, called after timeout
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def _killId(self, sid, success=False, failure_reason="UNKNOWN", profile=None):
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"""Delete an current_stream id, clean up associated observers
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@param sid: id of client.xep_0047_current_stream"""
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assert(profile)
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client = self.host.getClient(profile)
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if sid not in client.xep_0047_current_stream:
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@param sid(unicode): session id of client.xep_0047_current_stream
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@param client: %(doc_client)s
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"""
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log.info(_("In-Band Bytestream: TimeOut reached for id {sid} [{profile}]")
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.format(sid=sid, profile=client.profile))
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self._killSession(sid, client, "TIMEOUT")
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def _killSession(self, sid, client, failure_reason=None):
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"""Delete a current_stream id, clean up associated observers
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@param sid(unicode): session id
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@param client: %(doc_client)s
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@param failure_reason(None, unicode): if None the session is successful
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else, will be used to call failure_cb
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"""
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try:
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session = client.xep_0047_current_stream[sid]
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except KeyError:
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log.warning(_("kill id called on a non existant id"))
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return
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if "observer_cb" in client.xep_0047_current_stream[sid]:
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client.xmlstream.removeObserver(client.xep_0047_current_stream[sid]["event_data"], client.xep_0047_current_stream[sid]["observer_cb"])
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if client.xep_0047_current_stream[sid]['timer'].active():
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client.xep_0047_current_stream[sid]['timer'].cancel()
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if "size" in client.xep_0047_current_stream[sid]:
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self.host.removeProgressCB(sid, profile)
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file_obj = client.xep_0047_current_stream[sid]['file_obj']
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success_cb = client.xep_0047_current_stream[sid]['success_cb']
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failure_cb = client.xep_0047_current_stream[sid]['failure_cb']
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try:
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observer_cb = session['observer_cb']
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except KeyError:
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pass
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else:
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client.xmlstream.removeObserver(session["event_data"], observer_cb)
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if session['timer'].active():
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session['timer'].cancel()
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del client.xep_0047_current_stream[sid]
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success = failure_reason is None
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stream_d = session[DEFER_KEY]
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if success:
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success_cb(sid, file_obj, NS_IBB, profile)
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stream_d.callback(None)
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else:
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failure_cb(sid, file_obj, NS_IBB, failure_reason, profile)
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stream_d.errback(failure.Failure(exceptions.DataError(failure_reason)))
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def getProgress(self, sid, data, profile):
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"""Fill data with position of current transfer"""
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client = self.host.getClient(profile)
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try:
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file_obj = client.xep_0047_current_stream[sid]["file_obj"]
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data["position"] = str(file_obj.tell())
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data["size"] = str(client.xep_0047_current_stream[sid]["size"])
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except:
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pass
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def createSession(self, *args, **kwargs):
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"""like [_createSession] but return the session deferred instead of the whole session
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def prepareToReceive(self, from_jid, sid, file_obj, size, success_cb, failure_cb, profile):
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session deferred is fired when transfer is finished
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"""
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return self._createSession(*args, **kwargs)[DEFER_KEY]
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def _createSession(self, file_obj, to_jid, sid, profile):
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"""Called when a bytestream is imminent
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@param from_jid: jid of the sender
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@param sid: Stream id
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@param file_obj: File object where data will be written
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@param size: full size of the data, or None if unknown
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@param success_cb: method to call when successfuly finished
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@param failure_cb: method to call when something goes wrong
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@param profile: %(doc_profile)s"""
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client = self.host.getClient(profile)
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data = client.xep_0047_current_stream[sid] = {}
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data["from"] = from_jid
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data["file_obj"] = file_obj
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data["seq"] = -1
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if size:
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data["size"] = size
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self.host.registerProgressCB(sid, self.getProgress, profile)
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data["timer"] = reactor.callLater(TIMEOUT, self._timeOut, sid)
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data["success_cb"] = success_cb
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data["failure_cb"] = failure_cb
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def streamOpening(self, IQ, profile):
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log.debug(_("IBB stream opening"))
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IQ.handled = True
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@param file_obj(file): File object where data will be written
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@param to_jid(jid.JId): jid of the other peer
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@param sid(unicode): session id
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@param profile: %(doc_profile)s
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@return (dict): session data
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"""
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client = self.host.getClient(profile)
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open_elt = IQ.firstChildElement()
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if sid in client.xep_0047_current_stream:
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raise exceptions.ConflictError(u'A session with this id already exists !')
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session_data = client.xep_0047_current_stream[sid] = \
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{'id': sid,
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DEFER_KEY: defer.Deferred(),
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'to': to_jid,
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'file_obj': file_obj,
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'seq': -1,
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'timer': reactor.callLater(TIMEOUT, self._timeOut, sid, client),
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}
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return session_data
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def _onIBBOpen(self, iq_elt, profile):
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""""Called when an IBB <open> element is received
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@param iq_elt(domish.Element): the whole <iq> stanza
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@param profile: %(doc_profile)s
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"""
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log.debug(_(u"IBB stream opening"))
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iq_elt.handled = True
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client = self.host.getClient(profile)
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open_elt = iq_elt.elements(NS_IBB, 'open').next()
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block_size = open_elt.getAttribute('block-size')
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sid = open_elt.getAttribute('sid')
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stanza = open_elt.getAttribute('stanza', 'iq')
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if not sid or not block_size or int(block_size) > 65535:
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log.warning(_(u"malformed IBB transfer: %s" % IQ['id']))
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self.sendNotAcceptableError(IQ['id'], IQ['from'], client.xmlstream)
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return
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return self._sendError('not-acceptable', sid or None, iq_elt, client)
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if not sid in client.xep_0047_current_stream:
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log.warning(_(u"Ignoring unexpected IBB transfer: %s" % sid))
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self.sendNotAcceptableError(IQ['id'], IQ['from'], client.xmlstream)
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return
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if client.xep_0047_current_stream[sid]["from"] != jid.JID(IQ['from']):
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return self._sendError('not-acceptable', sid or None, iq_elt, client)
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session_data = client.xep_0047_current_stream[sid]
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if session_data["to"] != jid.JID(iq_elt['from']):
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log.warning(_("sended jid inconsistency (man in the middle attack attempt ?)"))
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self.sendNotAcceptableError(IQ['id'], IQ['from'], client.xmlstream)
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self._killId(sid, False, "PROTOCOL_ERROR", profile=profile)
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return
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return self._sendError('not-acceptable', sid, iq_elt, client)
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#at this stage, the session looks ok and will be accepted
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# at this stage, the session looks ok and will be accepted
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#we reset the timeout:
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client.xep_0047_current_stream[sid]["timer"].reset(TIMEOUT)
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# we reset the timeout:
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session_data["timer"].reset(TIMEOUT)
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#we save the xmlstream, events and observer data to allow observer removal
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client.xep_0047_current_stream[sid]["event_data"] = event_data = (IBB_MESSAGE_DATA if stanza == 'message' else IBB_IQ_DATA) % sid
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client.xep_0047_current_stream[sid]["observer_cb"] = observer_cb = self.messageData if stanza == 'message' else self.iqData
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event_close = IBB_CLOSE % sid
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#we now set the stream observer to look after data packet
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# we save the xmlstream, events and observer data to allow observer removal
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session_data["event_data"] = event_data = (IBB_MESSAGE_DATA if stanza == 'message' else IBB_IQ_DATA).format(sid)
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session_data["observer_cb"] = observer_cb = self._onIBBData
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event_close = IBB_CLOSE.format(sid)
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# we now set the stream observer to look after data packet
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# FIXME: if we never get the events, the observers stay.
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# would be better to have generic observer and check id once triggered
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client.xmlstream.addObserver(event_data, observer_cb, profile=profile)
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client.xmlstream.addOnetimeObserver(event_close, self.streamClosing, profile=profile)
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#finally, we send the accept stanza
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result = domish.Element((None, 'iq'))
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result['type'] = 'result'
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result['id'] = IQ['id']
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result['to'] = IQ['from']
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client.xmlstream.send(result)
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client.xmlstream.addOnetimeObserver(event_close, self._onIBBClose, profile=profile)
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# finally, we send the accept stanza
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iq_result_elt = xmlstream.toResponse(iq_elt, 'result')
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client.xmlstream.send(iq_result_elt)
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def streamClosing(self, IQ, profile):
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IQ.handled = True
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def _onIBBClose(self, iq_elt, profile):
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""""Called when an IBB <close> element is received
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@param iq_elt(domish.Element): the whole <iq> stanza
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@param profile: %(doc_profile)s
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"""
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iq_elt.handled = True
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client = self.host.getClient(profile)
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log.debug(_("IBB stream closing"))
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data_elt = IQ.firstChildElement()
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sid = data_elt.getAttribute('sid')
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result = domish.Element((None, 'iq'))
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result['type'] = 'result'
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result['id'] = IQ['id']
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result['to'] = IQ['from']
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client.xmlstream.send(result)
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self._killId(sid, success=True, profile=profile)
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close_elt = iq_elt.elements(NS_IBB, 'close').next()
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# XXX: this observer is only triggered on valid sid, so we don't need to check it
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sid = close_elt['sid']
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def iqData(self, IQ, profile):
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IQ.handled = True
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iq_result_elt = xmlstream.toResponse(iq_elt, 'result')
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client.xmlstream.send(iq_result_elt)
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self._killSession(sid, client)
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def _onIBBData(self, element, profile):
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"""Observer called on <iq> or <message> stanzas with data element
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Manage the data elelement (check validity and write to the file_obj)
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@param element(domish.Element): <iq> or <message> stanza
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@param profile: %(doc_profile)s
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"""
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element.handled = True
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client = self.host.getClient(profile)
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data_elt = IQ.firstChildElement()
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data_elt = element.elements(NS_IBB, 'data').next()
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sid = data_elt['sid']
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if self._manageDataElt(data_elt, 'iq', IQ['id'], jid.JID(IQ['from']), profile):
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#and send a success answer
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result = domish.Element((None, 'iq'))
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result['type'] = 'result'
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result['id'] = IQ['id']
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result['to'] = IQ['from']
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try:
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session_data = client.xep_0047_current_stream[sid]
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except KeyError:
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log.warning(_(u"Received data for an unknown session id"))
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return self._sendError('item-not-found', None, element, client)
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client.xmlstream.send(result)
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from_jid = session_data["to"]
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file_obj = session_data["file_obj"]
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def messageData(self, message_elt, profile):
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sid = message_elt.getAttribute('id', '')
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self._manageDataElt(message_elt, 'message', sid, jid.JID(message_elt['from']), profile)
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if from_jid.full() != element['from']:
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log.warning(_(u"sended jid inconsistency (man in the middle attack attempt ?)\ninitial={initial}\ngiven={given}").format(initial=from_jid, given=element['from']))
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if element.name == 'iq':
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self._sendError('not-acceptable', sid, element, client)
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return
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def _manageDataElt(self, data_elt, stanza, sid, stanza_from_jid, profile):
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"""Manage the data elelement (check validity and write to the file_obj)
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@param data_elt: "data" domish element
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@return: True if success"""
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client = self.host.getClient(profile)
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sid = data_elt.getAttribute('sid')
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if sid not in client.xep_0047_current_stream:
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log.error(_("Received data for an unknown session id"))
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return False
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session_data["seq"] = (session_data["seq"] + 1) % 65535
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if int(data_elt.getAttribute("seq", -1)) != session_data["seq"]:
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log.warning(_(u"Sequence error"))
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if element.name == 'iq':
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reason = 'not-acceptable'
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self._sendError(reason, sid, element, client)
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self.terminateStream(session_data, client, reason)
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return
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from_jid = client.xep_0047_current_stream[sid]["from"]
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file_obj = client.xep_0047_current_stream[sid]["file_obj"]
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# we reset the timeout:
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session_data["timer"].reset(TIMEOUT)
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if stanza_from_jid != from_jid:
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log.warning(_("sended jid inconsistency (man in the middle attack attempt ?)"))
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if stanza == 'iq':
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self.sendNotAcceptableError(sid, from_jid, client.xmlstream)
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return False
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client.xep_0047_current_stream[sid]["seq"] += 1
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if int(data_elt.getAttribute("seq", -1)) != client.xep_0047_current_stream[sid]["seq"]:
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log.warning(_("Sequence error"))
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if stanza == 'iq':
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self.sendNotAcceptableError(data_elt["id"], from_jid, client.xmlstream)
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return False
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#we reset the timeout:
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client.xep_0047_current_stream[sid]["timer"].reset(TIMEOUT)
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#we can now decode the data
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# we can now decode the data
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try:
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file_obj.write(base64.b64decode(str(data_elt)))
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except TypeError:
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#The base64 data is invalid
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log.warning(_("Invalid base64 data"))
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if stanza == 'iq':
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self.sendNotAcceptableError(data_elt["id"], from_jid, client.xmlstream)
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return False
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return True
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def sendNotAcceptableError(self, iq_id, to_jid, xmlstream):
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"""Not acceptable error used when the stream is not expected or something is going wrong
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@param iq_id: IQ id
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@param to_jid: addressee
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@param xmlstream: XML stream to use to send the error"""
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result = domish.Element((None, 'iq'))
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result['type'] = 'result'
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result['id'] = iq_id
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result['to'] = to_jid
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error_el = result.addElement('error')
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error_el['type'] = 'cancel'
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error_el.addElement(('urn:ietf:params:xml:ns:xmpp-stanzas', 'not-acceptable'))
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xmlstream.send(result)
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def startStream(self, file_obj, to_jid, sid, length, successCb, failureCb, size=None, profile=None):
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"""Launch the stream workflow
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@param file_obj: file_obj to send
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@param to_jid: JID of the recipient
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@param sid: Stream session id
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@param length: number of byte to send, or None to send until the end
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@param successCb: method to call when stream successfuly finished
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@param failureCb: method to call when something goes wrong
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@param profile: %(doc_profile)s"""
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client = self.host.getClient(profile)
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if length is not None:
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log.error(_('stream length not managed yet'))
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# The base64 data is invalid
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log.warning(_(u"Invalid base64 data"))
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if element.name == 'iq':
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self._sendError('not-acceptable', sid, element, client)
|
||||
self.terminateStream(session_data, client, reason)
|
||||
return
|
||||
data = client.xep_0047_current_stream[sid] = {}
|
||||
data["timer"] = reactor.callLater(TIMEOUT, self._timeOut, sid)
|
||||
data["file_obj"] = file_obj
|
||||
data["to"] = to_jid
|
||||
data["success_cb"] = successCb
|
||||
data["failure_cb"] = failureCb
|
||||
data["block_size"] = BLOCK_SIZE
|
||||
if size:
|
||||
data["size"] = size
|
||||
self.host.registerProgressCB(sid, self.getProgress, profile)
|
||||
|
||||
# we can now ack success
|
||||
if element.name == 'iq':
|
||||
iq_result_elt = xmlstream.toResponse(element, 'result')
|
||||
client.xmlstream.send(iq_result_elt)
|
||||
|
||||
def _sendError(self, error_condition, sid, iq_elt, client):
|
||||
"""Send error stanza
|
||||
|
||||
@param error_condition: one of twisted.words.protocols.jabber.error.STANZA_CONDITIONS keys
|
||||
@param sid(unicode,None): jingle session id, or None, if session must not be destroyed
|
||||
@param iq_elt(domish.Element): full <iq> stanza
|
||||
@param client: %(doc_client)s
|
||||
"""
|
||||
iq_elt = error.StanzaError(error_condition).toResponse(iq_elt)
|
||||
log.warning(u"Error while managing in-band bytestream session, cancelling: {}".format(error_condition))
|
||||
if sid is not None:
|
||||
self._killSession(sid, client, error_condition)
|
||||
client.xmlstream.send(iq_elt)
|
||||
|
||||
def startStream(self, file_obj, to_jid, sid, block_size=None, profile=None):
|
||||
"""Launch the stream workflow
|
||||
|
||||
@param file_obj(file): file_obj to send
|
||||
@param to_jid(jid.JID): JID of the recipient
|
||||
@param sid(unicode): Stream session id
|
||||
@param block_size(int, None): size of the block (or None for default)
|
||||
@param profile: %(doc_profile)s
|
||||
"""
|
||||
session_data = self._createSession(file_obj, to_jid, sid, profile)
|
||||
session_defer = session_data[DEFER_KEY]
|
||||
client = self.host.getClient(profile)
|
||||
|
||||
if block_size is None:
|
||||
block_size = XEP_0047.BLOCK_SIZE
|
||||
assert block_size <= 65535
|
||||
session_data["block_size"] = block_size
|
||||
|
||||
iq_elt = jabber_client.IQ(client.xmlstream, 'set')
|
||||
iq_elt['from'] = client.jid.full()
|
||||
iq_elt['to'] = to_jid.full()
|
||||
open_elt = iq_elt.addElement('open', NS_IBB)
|
||||
open_elt['block-size'] = str(BLOCK_SIZE)
|
||||
open_elt['block-size'] = str(block_size)
|
||||
open_elt['sid'] = sid
|
||||
open_elt['stanza'] = 'iq'
|
||||
iq_elt.addCallback(self.iqResult, sid, 0, length, profile)
|
||||
open_elt['stanza'] = 'iq' # TODO: manage <message> stanza ?
|
||||
iq_elt.addCallback(self._IQDataStream, session_data, client)
|
||||
iq_elt.send()
|
||||
return session_defer
|
||||
|
||||
def iqResult(self, sid, seq, length, profile, iq_elt):
|
||||
"""Called when the result of open iq is received"""
|
||||
client = self.host.getClient(profile)
|
||||
data = client.xep_0047_current_stream[sid]
|
||||
if iq_elt["type"] == "error":
|
||||
log.warning(_("Transfer failed"))
|
||||
self.terminateStream(sid, "IQ_ERROR")
|
||||
def _IQDataStream(self, session_data, client, iq_elt):
|
||||
"""Called during the whole data streaming
|
||||
|
||||
@param session_data(dict): data of this streaming session
|
||||
@param client: %(doc_client)s
|
||||
@param iq_elt(domish.Element): iq result
|
||||
"""
|
||||
if iq_elt['type'] == 'error':
|
||||
log.warning(_(u"IBB transfer failed: {}").format(iq_elt))
|
||||
self.terminateStream(session_data, client, "IQ_ERROR")
|
||||
return
|
||||
|
||||
if data['timer'].active():
|
||||
data['timer'].cancel()
|
||||
session_data["timer"].reset(TIMEOUT)
|
||||
|
||||
buffer = data["file_obj"].read(data["block_size"])
|
||||
if buffer:
|
||||
buffer_ = session_data["file_obj"].read(session_data["block_size"])
|
||||
if buffer_:
|
||||
next_iq_elt = jabber_client.IQ(client.xmlstream, 'set')
|
||||
next_iq_elt['to'] = data["to"].full()
|
||||
next_iq_elt['to'] = session_data["to"].full()
|
||||
data_elt = next_iq_elt.addElement('data', NS_IBB)
|
||||
data_elt['seq'] = str(seq)
|
||||
data_elt['sid'] = sid
|
||||
data_elt.addContent(base64.b64encode(buffer))
|
||||
next_iq_elt.addCallback(self.iqResult, sid, seq + 1, length, profile)
|
||||
seq = session_data['seq'] = (session_data['seq'] + 1) % 65535
|
||||
data_elt['seq'] = unicode(seq)
|
||||
data_elt['sid'] = session_data['id']
|
||||
data_elt.addContent(base64.b64encode(buffer_))
|
||||
next_iq_elt.addCallback(self._IQDataStream, session_data, client)
|
||||
next_iq_elt.send()
|
||||
else:
|
||||
self.terminateStream(sid, profile=profile)
|
||||
self.terminateStream(session_data, client)
|
||||
|
||||
def terminateStream(self, sid, failure_reason=None, profile=None):
|
||||
def terminateStream(self, session_data, client, failure_reason=None):
|
||||
"""Terminate the stream session
|
||||
@param to_jid: recipient
|
||||
@param sid: Session id
|
||||
@param file_obj: file object used
|
||||
@param xmlstream: XML stream used with this session
|
||||
@param progress_cb: True if we have to remove the progress callback
|
||||
@param callback: method to call after finishing
|
||||
@param failure_reason: reason of the failure, or None if steam was successful"""
|
||||
client = self.host.getClient(profile)
|
||||
data = client.xep_0047_current_stream[sid]
|
||||
|
||||
@param session_data(dict): data of this streaming session
|
||||
@param client: %(doc_client)s
|
||||
@param failure_reason(unicode, None): reason of the failure, or None if steam was successful
|
||||
"""
|
||||
iq_elt = jabber_client.IQ(client.xmlstream, 'set')
|
||||
iq_elt['to'] = data["to"].full()
|
||||
iq_elt['to'] = session_data["to"].full()
|
||||
close_elt = iq_elt.addElement('close', NS_IBB)
|
||||
close_elt['sid'] = sid
|
||||
close_elt['sid'] = session_data['id']
|
||||
iq_elt.send()
|
||||
self.host.removeProgressCB(sid, profile)
|
||||
if failure_reason:
|
||||
self._killId(sid, False, failure_reason, profile=profile)
|
||||
else:
|
||||
self._killId(sid, True, profile=profile)
|
||||
self._killSession(session_data['id'], client, failure_reason)
|
||||
|
||||
|
||||
class XEP_0047_handler(XMPPHandler):
|
||||
|
|
@ -348,7 +356,7 @@ class XEP_0047_handler(XMPPHandler):
|
|||
self.plugin_parent = parent
|
||||
|
||||
def connectionInitialized(self):
|
||||
self.xmlstream.addObserver(IBB_OPEN, self.plugin_parent.streamOpening, profile=self.parent.profile)
|
||||
self.xmlstream.addObserver(IBB_OPEN, self.plugin_parent._onIBBOpen, profile=self.parent.profile)
|
||||
|
||||
def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
|
||||
return [disco.DiscoFeature(NS_IBB)]
|
||||
|
|
|
|||
Loading…
Reference in a new issue