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 = { 'block_size': 4096, 'max_block_size': 8192, 'window_size': 1, 'auto_accept': False, } def plugin_init(self): self._streams = {} self._pending_streams = {} self._pending_lock = threading.Lock() self._stream_lock = threading.Lock() self._preauthed_sids_lock = threading.Lock() 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): with self._streams_lock: 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: if iq['ibb_open']['block_size'] <= self.max_block_size: return True return False def _authorized_sid(self, jid, sid, ifrom, iq): with self._preauthed_sids_lock: 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): with self._preauthed_sids_lock: self._preauthed_sids[(jid, sid, ifrom)] = True def open_stream(self, jid, block_size=None, sid=None, window=1, use_messages=False, ifrom=None, block=True, 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'] = 'iq' stream = IBBytestream(self.xmpp, sid, block_size, iq['from'], iq['to'], window, use_messages) 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: 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.set() self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream) self.xmpp.event('ibb_stream_start', stream) self.xmpp.event('stream:%s:%s' % (stream.sid, stream.peer_jid), 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'] 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='modify', condition='not-acceptable') if size > self.max_block_size: raise XMPPError('resource-constraint') stream = IBBytestream(self.xmpp, sid, size, iq['to'], iq['from'], self.window_size) stream.stream_started.set() self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream) iq.reply() iq.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'](stanza['to'], sid, stanza['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')