216 lines
7.6 KiB
Python
216 lines
7.6 KiB
Python
import uuid
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import logging
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import threading
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from sleekxmpp import Message, Iq
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from sleekxmpp.exceptions import XMPPError
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from sleekxmpp.xmlstream.handler import Callback
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from sleekxmpp.xmlstream.matcher import StanzaPath
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from sleekxmpp.xmlstream import register_stanza_plugin
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from sleekxmpp.plugins import BasePlugin
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from sleekxmpp.plugins.xep_0047 import stanza, Open, Close, Data, IBBytestream
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log = logging.getLogger(__name__)
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class XEP_0047(BasePlugin):
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name = 'xep_0047'
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description = 'XEP-0047: In-band Bytestreams'
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dependencies = set(['xep_0030'])
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stanza = stanza
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default_config = {
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'block_size': 4096,
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'max_block_size': 8192,
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'window_size': 1,
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'auto_accept': False,
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}
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def plugin_init(self):
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self._streams = {}
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self._pending_streams = {}
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self._pending_lock = threading.Lock()
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self._stream_lock = threading.Lock()
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self._preauthed_sids_lock = threading.Lock()
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self._preauthed_sids = {}
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register_stanza_plugin(Iq, Open)
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register_stanza_plugin(Iq, Close)
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register_stanza_plugin(Iq, Data)
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register_stanza_plugin(Message, Data)
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self.xmpp.register_handler(Callback(
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'IBB Open',
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StanzaPath('iq@type=set/ibb_open'),
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self._handle_open_request))
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self.xmpp.register_handler(Callback(
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'IBB Close',
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StanzaPath('iq@type=set/ibb_close'),
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self._handle_close))
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self.xmpp.register_handler(Callback(
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'IBB Data',
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StanzaPath('iq@type=set/ibb_data'),
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self._handle_data))
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self.xmpp.register_handler(Callback(
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'IBB Message Data',
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StanzaPath('message/ibb_data'),
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self._handle_data))
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self.api.register(self._authorized, 'authorized', default=True)
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self.api.register(self._authorized_sid, 'authorized_sid', default=True)
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self.api.register(self._preauthorize_sid, 'preauthorize_sid', default=True)
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self.api.register(self._get_stream, 'get_stream', default=True)
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self.api.register(self._set_stream, 'set_stream', default=True)
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self.api.register(self._del_stream, 'del_stream', default=True)
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def plugin_end(self):
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self.xmpp.remove_handler('IBB Open')
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self.xmpp.remove_handler('IBB Close')
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self.xmpp.remove_handler('IBB Data')
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self.xmpp.remove_handler('IBB Message Data')
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self.xmpp['xep_0030'].del_feature(feature='http://jabber.org/protocol/ibb')
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def session_bind(self, jid):
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self.xmpp['xep_0030'].add_feature('http://jabber.org/protocol/ibb')
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def _get_stream(self, jid, sid, peer_jid, data):
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return self._streams.get((jid, sid, peer_jid), None)
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def _set_stream(self, jid, sid, peer_jid, stream):
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self._streams[(jid, sid, peer_jid)] = stream
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def _del_stream(self, jid, sid, peer_jid, data):
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with self._stream_lock:
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if (jid, sid, peer_jid) in self._streams:
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del self._streams[(jid, sid, peer_jid)]
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def _accept_stream(self, iq):
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receiver = iq['to']
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sender = iq['from']
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sid = iq['ibb_open']['sid']
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if self.api['authorized_sid'](receiver, sid, sender, iq):
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return True
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return self.api['authorized'](receiver, sid, sender, iq)
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def _authorized(self, jid, sid, ifrom, iq):
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if self.auto_accept:
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if iq['ibb_open']['block_size'] <= self.max_block_size:
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return True
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return False
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def _authorized_sid(self, jid, sid, ifrom, iq):
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with self._preauthed_sids_lock:
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if (jid, sid, ifrom) in self._preauthed_sids:
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del self._preauthed_sids[(jid, sid, ifrom)]
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return True
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return False
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def _preauthorize_sid(self, jid, sid, ifrom, data):
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with self._preauthed_sids_lock:
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self._preauthed_sids[(jid, sid, ifrom)] = True
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def open_stream(self, jid, block_size=None, sid=None, window=1, use_messages=False,
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ifrom=None, block=True, timeout=None, callback=None):
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if sid is None:
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sid = str(uuid.uuid4())
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if block_size is None:
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block_size = self.block_size
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iq = self.xmpp.Iq()
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iq['type'] = 'set'
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iq['to'] = jid
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iq['from'] = ifrom
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iq['ibb_open']['block_size'] = block_size
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iq['ibb_open']['sid'] = sid
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iq['ibb_open']['stanza'] = 'iq'
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stream = IBBytestream(self.xmpp, sid, block_size,
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iq['from'], iq['to'], window,
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use_messages)
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with self._stream_lock:
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self._pending_streams[iq['id']] = stream
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self._pending_streams[iq['id']] = stream
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if block:
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resp = iq.send(timeout=timeout)
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self._handle_opened_stream(resp)
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return stream
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else:
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cb = None
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if callback is not None:
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def chained(resp):
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self._handle_opened_stream(resp)
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callback(resp)
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cb = chained
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else:
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cb = self._handle_opened_stream
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return iq.send(block=block, timeout=timeout, callback=cb)
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def _handle_opened_stream(self, iq):
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if iq['type'] == 'result':
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with self._stream_lock:
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stream = self._pending_streams.get(iq['id'], None)
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if stream is not None:
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log.debug('IBB stream (%s) accepted by %s', stream.sid, iq['from'])
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stream.self_jid = iq['to']
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stream.peer_jid = iq['from']
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stream.stream_started.set()
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self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream)
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self.xmpp.event('ibb_stream_start', stream)
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self.xmpp.event('stream:%s:%s' % (stream.sid, stream.peer_jid), stream)
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with self._stream_lock:
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if iq['id'] in self._pending_streams:
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del self._pending_streams[iq['id']]
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def _handle_open_request(self, iq):
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sid = iq['ibb_open']['sid']
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size = iq['ibb_open']['block_size'] or self.block_size
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log.debug('Received IBB stream request from %s', iq['from'])
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if not sid:
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raise XMPPError(etype='modify', condition='bad-request')
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if not self._accept_stream(iq):
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raise XMPPError(etype='modify', condition='not-acceptable')
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if size > self.max_block_size:
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raise XMPPError('resource-constraint')
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stream = IBBytestream(self.xmpp, sid, size,
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iq['to'], iq['from'],
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self.window_size)
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stream.stream_started.set()
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self.api['set_stream'](stream.self_jid, stream.sid, stream.peer_jid, stream)
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iq.reply()
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iq.send()
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self.xmpp.event('ibb_stream_start', stream)
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self.xmpp.event('stream:%s:%s' % (sid, stream.peer_jid), stream)
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def _handle_data(self, stanza):
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sid = stanza['ibb_data']['sid']
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stream = self.api['get_stream'](stanza['to'], sid, stanza['from'])
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if stream is not None and stanza['from'] == stream.peer_jid:
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stream._recv_data(stanza)
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else:
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raise XMPPError('item-not-found')
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def _handle_close(self, iq):
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sid = iq['ibb_close']['sid']
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stream = self.api['get_stream'](iq['to'], sid, iq['from'])
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if stream is not None and iq['from'] == stream.peer_jid:
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stream._closed(iq)
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self.api['del_stream'](stream.self_jid, stream.sid, stream.peer_jid)
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else:
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raise XMPPError('item-not-found')
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