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import uuid
import logging
import threading
from sleekxmpp import Message, Iq
from sleekxmpp.exceptions import XMPPError
from sleekxmpp.xmlstream.handler import Callback
from sleekxmpp.xmlstream.matcher import StanzaPath
from sleekxmpp.xmlstream import register_stanza_plugin
from sleekxmpp.plugins import BasePlugin
from sleekxmpp.plugins.xep_0047 import stanza, Open, Close, Data, IBBytestream
log = logging.getLogger(__name__)
class XEP_0047(BasePlugin):
name = 'xep_0047'
description = 'XEP-0047: In-band Bytestreams'
dependencies = set(['xep_0030'])
stanza = stanza
default_config = {
'max_block_size': 8192,
'window_size': 1,
'auto_accept': True,
'accept_stream': None
}
def plugin_init(self):
self.streams = {}
self.pending_streams = {}
self.pending_close_streams = {}
self._stream_lock = threading.Lock()
register_stanza_plugin(Iq, Open)
register_stanza_plugin(Iq, Close)
register_stanza_plugin(Iq, Data)
self.xmpp.register_handler(Callback(
'IBB Open',
StanzaPath('iq@type=set/ibb_open'),
self._handle_open_request))
self.xmpp.register_handler(Callback(
'IBB Close',
StanzaPath('iq@type=set/ibb_close'),
self._handle_close))
self.xmpp.register_handler(Callback(
'IBB Data',
StanzaPath('iq@type=set/ibb_data'),
self._handle_data))
def plugin_end(self):
self.xmpp.remove_handler('IBB Open')
self.xmpp.remove_handler('IBB Close')
self.xmpp.remove_handler('IBB Data')
self.xmpp['xep_0030'].del_feature(feature='http://jabber.org/protocol/ibb')
def session_bind(self, jid):
self.xmpp['xep_0030'].add_feature('http://jabber.org/protocol/ibb')
def _accept_stream(self, iq):
if self.accept_stream is not None:
return self.accept_stream(iq)
if self.auto_accept:
if iq['ibb_open']['block_size'] <= self.max_block_size:
return True
return False
def open_stream(self, jid, block_size=4096, sid=None, window=1,
ifrom=None, block=True, timeout=None, callback=None):
if sid is None:
sid = str(uuid.uuid4())
iq = self.xmpp.Iq()
iq['type'] = 'set'
iq['to'] = jid
iq['from'] = ifrom
iq['ibb_open']['block_size'] = block_size
iq['ibb_open']['sid'] = sid
iq['ibb_open']['stanza'] = 'iq'
stream = IBBytestream(self.xmpp, sid, block_size,
iq['to'], iq['from'], window)
with self._stream_lock:
self.pending_streams[iq['id']] = stream
self.pending_streams[iq['id']] = stream
if block:
resp = iq.send(timeout=timeout)
self._handle_opened_stream(resp)
return stream
else:
cb = None
if callback is not None:
def chained(resp):
self._handle_opened_stream(resp)
callback(resp)
cb = chained
else:
cb = self._handle_opened_stream
return iq.send(block=block, timeout=timeout, callback=cb)
def _handle_opened_stream(self, iq):
if iq['type'] == 'result':
with self._stream_lock:
stream = self.pending_streams.get(iq['id'], None)
if stream is not None:
stream.sender = iq['to']
stream.receiver = iq['from']
stream.stream_started.set()
self.streams[stream.sid] = stream
self.xmpp.event('ibb_stream_start', stream)
with self._stream_lock:
if iq['id'] in self.pending_streams:
del self.pending_streams[iq['id']]
def _handle_open_request(self, iq):
sid = iq['ibb_open']['sid']
size = iq['ibb_open']['block_size']
if not self._accept_stream(iq):
raise XMPPError('not-acceptable')
if size > self.max_block_size:
raise XMPPError('resource-constraint')
stream = IBBytestream(self.xmpp, sid, size,
iq['from'], iq['to'],
self.window_size)
stream.stream_started.set()
self.streams[sid] = stream
iq.reply()
iq.send()
self.xmpp.event('ibb_stream_start', stream)
def _handle_data(self, iq):
sid = iq['ibb_data']['sid']
stream = self.streams.get(sid, None)
if stream is not None and iq['from'] != stream.sender:
stream._recv_data(iq)
else:
raise XMPPError('item-not-found')
def _handle_close(self, iq):
sid = iq['ibb_close']['sid']
stream = self.streams.get(sid, None)
if stream is not None and iq['from'] != stream.sender:
stream._closed(iq)
else:
raise XMPPError('item-not-found')
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