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import asyncio
import uuid
import logging
from slixmpp import Message, Iq
from slixmpp.exceptions import XMPPError
from slixmpp.xmlstream.handler import Callback
from slixmpp.xmlstream.matcher import StanzaPath
from slixmpp.xmlstream import register_stanza_plugin
from slixmpp.plugins import BasePlugin
from slixmpp.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 = {'xep_0030'}
stanza = stanza
default_config = {
'block_size': 4096,
'max_block_size': 8192,
'auto_accept': False,
}
def plugin_init(self):
self._streams = {}
self._preauthed_sids = {}
register_stanza_plugin(Iq, Open)
register_stanza_plugin(Iq, Close)
register_stanza_plugin(Iq, Data)
register_stanza_plugin(Message, 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))
self.xmpp.register_handler(Callback(
'IBB Message Data',
StanzaPath('message/ibb_data'),
self._handle_data))
self.api.register(self._authorized, 'authorized', default=True)
self.api.register(self._authorized_sid, 'authorized_sid', default=True)
self.api.register(self._preauthorize_sid, 'preauthorize_sid', default=True)
self.api.register(self._get_stream, 'get_stream', default=True)
self.api.register(self._set_stream, 'set_stream', default=True)
self.api.register(self._del_stream, 'del_stream', default=True)
def plugin_end(self):
self.xmpp.remove_handler('IBB Open')
self.xmpp.remove_handler('IBB Close')
self.xmpp.remove_handler('IBB Data')
self.xmpp.remove_handler('IBB Message 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 _get_stream(self, jid, sid, peer_jid, data):
return self._streams.get((jid, sid, peer_jid), None)
def _set_stream(self, jid, sid, peer_jid, stream):
self._streams[(jid, sid, peer_jid)] = stream
def _del_stream(self, jid, sid, peer_jid, data):
if (jid, sid, peer_jid) in self._streams:
del self._streams[(jid, sid, peer_jid)]
def _accept_stream(self, iq):
receiver = iq['to']
sender = iq['from']
sid = iq['ibb_open']['sid']
if self.api['authorized_sid'](receiver, sid, sender, iq):
return True
return self.api['authorized'](receiver, sid, sender, iq)
def _authorized(self, jid, sid, ifrom, iq):
if self.auto_accept:
return True
return False
def _authorized_sid(self, jid, sid, ifrom, iq):
if (jid, sid, ifrom) in self._preauthed_sids:
del self._preauthed_sids[(jid, sid, ifrom)]
return True
return False
def _preauthorize_sid(self, jid, sid, ifrom, data):
self._preauthed_sids[(jid, sid, ifrom)] = True
def open_stream(self, jid, block_size=None, sid=None, use_messages=False,
ifrom=None, timeout=None, callback=None):
if sid is None:
sid = str(uuid.uuid4())
if block_size is None:
block_size = self.block_size
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'] = 'message' if use_messages else 'iq'
stream = IBBytestream(self.xmpp, sid, block_size,
iq['from'], iq['to'], use_messages)
stream_future = asyncio.Future()
def _handle_opened_stream(iq):
log.debug('IBB stream (%s) accepted by %s', stream.sid, iq['from'])
stream.self_jid = iq['to']
stream.peer_jid = iq['from']
stream.stream_started = True
self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream)
stream_future.set_result(stream)
if callback is not None:
callback(stream)
self.xmpp.event('ibb_stream_start', stream)
self.xmpp.event('stream:%s:%s' % (stream.sid, stream.peer_jid), stream)
iq.send(timeout=timeout, callback=_handle_opened_stream)
return stream_future
def _handle_open_request(self, iq):
sid = iq['ibb_open']['sid']
size = iq['ibb_open']['block_size'] or self.block_size
log.debug('Received IBB stream request from %s', iq['from'])
if not sid:
raise XMPPError(etype='modify', condition='bad-request')
if not self._accept_stream(iq):
raise XMPPError(etype='cancel', condition='not-acceptable')
if size > self.max_block_size:
raise XMPPError('resource-constraint')
stream = IBBytestream(self.xmpp, sid, size,
iq['to'], iq['from'])
stream.stream_started = True
self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream)
iq.reply().send()
self.xmpp.event('ibb_stream_start', stream)
self.xmpp.event('stream:%s:%s' % (sid, stream.peer_jid), stream)
def _handle_data(self, stanza):
sid = stanza['ibb_data']['sid']
stream = self.api['get_stream'](stanza['to'], sid, stanza['from'])
if stream is not None and stanza['from'] == stream.peer_jid:
stream._recv_data(stanza)
else:
raise XMPPError('item-not-found')
def _handle_close(self, iq):
sid = iq['ibb_close']['sid']
stream = self.api['get_stream'](iq['to'], sid, iq['from'])
if stream is not None and iq['from'] == stream.peer_jid:
stream._closed(iq)
self.api['del_stream'](stream.self_jid, stream.sid, stream.peer_jid)
else:
raise XMPPError('item-not-found')
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