Merge branch 'si_file_transfer' into develop

9 files changed, 507 insertions, 47 deletions

diff --git a/sleekxmpp/plugins/xep_0047/ibb.py b/sleekxmpp/plugins/xep_0047/ibb.py
index e341433f..6110b26c 100644
--- a/sleekxmpp/plugins/xep_0047/ibb.py
+++ b/sleekxmpp/plugins/xep_0047/ibb.py
@@ -21,18 +21,21 @@ class XEP_0047(BasePlugin):
     dependencies = set(['xep_0030'])
     stanza = stanza
     default_config = {
+        'block_size': 4096,
         'max_block_size': 8192,
         'window_size': 1,
-        'auto_accept': True,
-        'accept_stream': None
+        'auto_accept': False,
     }
 
     def plugin_init(self):
-        self.streams = {}
-        self.pending_streams = {}
-        self.pending_close_streams = {}
+        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)
@@ -58,6 +61,13 @@ class XEP_0047(BasePlugin):
             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')
@@ -68,18 +78,49 @@ class XEP_0047(BasePlugin):
     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):
-        if self.accept_stream is not None:
-            return self.accept_stream(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 open_stream(self, jid, block_size=4096, sid=None, window=1, use_messages=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'
@@ -90,13 +131,13 @@ class XEP_0047(BasePlugin):
         iq['ibb_open']['stanza'] = 'iq'
 
         stream = IBBytestream(self.xmpp, sid, block_size,
-                              iq['to'], iq['from'], window,
+                              iq['from'], iq['to'], window,
                               use_messages)
 
         with self._stream_lock:
-            self.pending_streams[iq['id']] = stream
+            self._pending_streams[iq['id']] = stream
 
-        self.pending_streams[iq['id']] = stream
+        self._pending_streams[iq['id']] = stream
 
         if block:
             resp = iq.send(timeout=timeout)
@@ -116,49 +157,59 @@ class XEP_0047(BasePlugin):
     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)
+                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']]
+            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']
+        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('not-acceptable')
+            raise XMPPError(etype='modify', condition='not-acceptable')
 
         if size > self.max_block_size:
             raise XMPPError('resource-constraint')
 
         stream = IBBytestream(self.xmpp, sid, size,
-                              iq['from'], iq['to'],
+                              iq['to'], iq['from'],
                               self.window_size)
         stream.stream_started.set()
-        self.streams[sid] = stream
+        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.streams.get(sid, None)
-        if stream is not None and stanza['from'] != stream.sender:
+        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.streams.get(sid, None)
-        if stream is not None and iq['from'] != stream.sender:
+        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')
diff --git a/sleekxmpp/plugins/xep_0047/stream.py b/sleekxmpp/plugins/xep_0047/stream.py
index adc86450..9651edf8 100644
--- a/sleekxmpp/plugins/xep_0047/stream.py
+++ b/sleekxmpp/plugins/xep_0047/stream.py
@@ -12,15 +12,17 @@ log = logging.getLogger(__name__)
 
 class IBBytestream(object):
 
-    def __init__(self, xmpp, sid, block_size, to, ifrom, window_size=1, use_messages=False):
+    def __init__(self, xmpp, sid, block_size, jid, peer, window_size=1, use_messages=False):
         self.xmpp = xmpp
         self.sid = sid
         self.block_size = block_size
         self.window_size = window_size
         self.use_messages = use_messages
 
-        self.receiver = to
-        self.sender = ifrom
+        if jid is None:
+            jid = xmpp.boundjid
+        self.self_jid = jid
+        self.peer_jid = peer
 
         self.send_seq = -1
         self.recv_seq = -1
@@ -50,8 +52,8 @@ class IBBytestream(object):
             seq = self.send_seq
         if self.use_messages:
             msg = self.xmpp.Message()
-            msg['to'] = self.receiver
-            msg['from'] = self.sender
+            msg['to'] = self.peer_jid
+            msg['from'] = self.self_jid
             msg['id'] = self.xmpp.new_id()
             msg['ibb_data']['sid'] = self.sid
             msg['ibb_data']['seq'] = seq
@@ -61,8 +63,8 @@ class IBBytestream(object):
         else:
             iq = self.xmpp.Iq()
             iq['type'] = 'set'
-            iq['to'] = self.receiver
-            iq['from'] = self.sender
+            iq['to'] = self.peer_jid
+            iq['from'] = self.self_jid
             iq['ibb_data']['sid'] = self.sid
             iq['ibb_data']['seq'] = seq
             iq['ibb_data']['data'] = data
@@ -121,8 +123,8 @@ class IBBytestream(object):
     def close(self):
         iq = self.xmpp.Iq()
         iq['type'] = 'set'
-        iq['to'] = self.receiver
-        iq['from'] = self.sender
+        iq['to'] = self.peer_jid
+        iq['from'] = self.self_jid
         iq['ibb_close']['sid'] = self.sid
         self.stream_out_closed.set()
         iq.send(block=False,
@@ -132,9 +134,6 @@ class IBBytestream(object):
     def _closed(self, iq):
         self.stream_in_closed.set()
         self.stream_out_closed.set()
-        while not self.window_empty.is_set():
-            log.info('waiting for send window to empty')
-            self.window_empty.wait(timeout=1)
         iq.reply()
         iq.send()
         self.xmpp.event('ibb_stream_end', self)
diff --git a/sleekxmpp/plugins/xep_0065/proxy.py b/sleekxmpp/plugins/xep_0065/proxy.py
index 473dd033..265d3030 100644
--- a/sleekxmpp/plugins/xep_0065/proxy.py
+++ b/sleekxmpp/plugins/xep_0065/proxy.py
@@ -25,6 +25,9 @@ class XEP_0065(base_plugin):
     name = 'xep_0065'
     description = "Socks5 Bytestreams"
     dependencies = set(['xep_0030'])
+    default_config = {
+        'auto_accept': False
+    }
 
     def plugin_init(self):
         register_stanza_plugin(Iq, Socks5)
@@ -33,11 +36,18 @@ class XEP_0065(base_plugin):
         self._sessions = {}
         self._sessions_lock = threading.Lock()
 
+        self._preauthed_sids_lock = threading.Lock()
+        self._preauthed_sids = {}
+
         self.xmpp.register_handler(
             Callback('Socks5 Bytestreams',
                      StanzaPath('iq@type=set/socks/streamhost'),
                      self._handle_streamhost))
 
+        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)
+
     def session_bind(self, jid):
         self.xmpp['xep_0030'].add_feature(Socks5.namespace)
 
@@ -50,14 +60,15 @@ class XEP_0065(base_plugin):
         """Returns the socket associated to the SID."""
         return self._sessions.get(sid, None)
 
-    def handshake(self, to, ifrom=None, timeout=None):
+    def handshake(self, to, ifrom=None, sid=None, timeout=None):
         """ Starts the handshake to establish the socks5 bytestreams
         connection.
         """
         if not self._proxies:
             self._proxies = self.discover_proxies()
 
-        sid = uuid4().hex
+        if sid is None:
+            sid = uuid4().hex
 
         used = self.request_stream(to, sid=sid, ifrom=ifrom, timeout=timeout)
         proxy = used['socks']['streamhost_used']['jid']
@@ -72,10 +83,12 @@ class XEP_0065(base_plugin):
                     self.xmpp.boundjid,
                     to,
                     self._proxies[proxy][0],
-                    self._proxies[proxy][1])
+                    self._proxies[proxy][1],
+                    peer=to)
 
         # Request that the proxy activate the session with the target.
         self.activate(proxy, sid, to, timeout=timeout)
+        self.xmpp.event('stream:%s:%s' % (sid, conn.peer_jid), conn)
         return self.get_socket(sid)
 
     def request_stream(self, to, sid=None, ifrom=None, block=True, timeout=None, callback=None):
@@ -139,19 +152,24 @@ class XEP_0065(base_plugin):
         """Handle incoming SOCKS5 session request."""
         sid = iq['socks']['sid']
         if not sid:
+            raise XMPPError(etype='modify', condition='bad-request')
+
+        if not self._accept_stream(iq):
             raise XMPPError(etype='modify', condition='not-acceptable')
 
         streamhosts = iq['socks']['streamhosts']
         conn = None
         used_streamhost = None
 
+        sender = iq['from']
         for streamhost in streamhosts:
             try:
                 conn = self._connect_proxy(sid,
-                    iq['from'],
+                    sender,
                     self.xmpp.boundjid,
                     streamhost['host'],
-                    streamhost['port'])
+                    streamhost['port'],
+                    peer=sender)
                 used_streamhost = streamhost['jid']
                 break
             except socket.error:
@@ -165,6 +183,8 @@ class XEP_0065(base_plugin):
         iq['socks']['sid'] = sid
         iq['socks']['streamhost_used']['jid'] = used_streamhost
         iq.send()
+        self.xmpp.event('socks5_stream', conn)
+        self.xmpp.event('stream:%s:%s' % (sid, conn.peer_jid), conn)
 
     def activate(self, proxy, sid, target, ifrom=None, block=True, timeout=None, callback=None):
         """Activate the socks5 session that has been negotiated."""
@@ -191,7 +211,7 @@ class XEP_0065(base_plugin):
         with self._sessions_lock:
             self._sessions = {}
 
-    def _connect_proxy(self, sid, requester, target, proxy, proxy_port):
+    def _connect_proxy(self, sid, requester, target, proxy, proxy_port, peer=None):
         """ Establishes a connection between the client and the server-side
         Socks5 proxy.
 
@@ -200,6 +220,8 @@ class XEP_0065(base_plugin):
         target     : The JID of the target. <str>
         proxy_host : The hostname or the IP of the proxy. <str>
         proxy_port : The port of the proxy. <str> or <int>
+        peer       : The JID for the other side of the stream, regardless
+                     of target or requester status.
         """
         # Because the xep_0065 plugin uses the proxy_port as string,
         # the Proxy class accepts the proxy_port argument as a string
@@ -230,6 +252,34 @@ class XEP_0065(base_plugin):
             _close()
         sock.close = close
 
-        self.xmpp.event('socks_connected', sid)
+        sock.peer_jid = peer
+        sock.self_jid = target if requester == peer else requester
 
+        self.xmpp.event('socks_connected', sid)
         return sock
+
+    def _accept_stream(self, iq):
+        receiver = iq['to']
+        sender = iq['from']
+        sid = iq['socks']['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):
+        return self.auto_accept
+
+    def _authorized_sid(self, jid, sid, ifrom, iq):
+        with self._preauthed_sids_lock:
+            log.debug('>>> authed sids: %s', self._preauthed_sids)
+            log.debug('>>> lookup: %s %s %s', jid, sid, ifrom)
+            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):
+        log.debug('>>>> %s %s %s %s', jid, sid, ifrom, data)
+        with self._preauthed_sids_lock:
+            self._preauthed_sids[(jid, sid, ifrom)] = True
diff --git a/sleekxmpp/plugins/xep_0095/__init__.py b/sleekxmpp/plugins/xep_0095/__init__.py
new file mode 100644
index 00000000..4465ef5c
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0095/__init__.py
@@ -0,0 +1,16 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.base import register_plugin
+
+from sleekxmpp.plugins.xep_0095 import stanza
+from sleekxmpp.plugins.xep_0095.stanza import SI
+from sleekxmpp.plugins.xep_0095.stream_initiation import XEP_0095
+
+
+register_plugin(XEP_0095)
diff --git a/sleekxmpp/plugins/xep_0095/stanza.py b/sleekxmpp/plugins/xep_0095/stanza.py
new file mode 100644
index 00000000..34999a11
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0095/stanza.py
@@ -0,0 +1,25 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.xmlstream import ElementBase
+
+
+class SI(ElementBase):
+    name = 'si'
+    namespace = 'http://jabber.org/protocol/si'
+    plugin_attrib = 'si'
+    interfaces = set(['id', 'mime_type', 'profile'])
+
+    def get_mime_type(self):
+        return self._get_attr('mime-type', 'application/octet-stream')
+
+    def set_mime_type(self, value):
+        self._set_attr('mime-type', value)
+
+    def del_mime_type(self):
+        self._del_attr('mime-type')
diff --git a/sleekxmpp/plugins/xep_0095/stream_initiation.py b/sleekxmpp/plugins/xep_0095/stream_initiation.py
new file mode 100644
index 00000000..cfe6deb5
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0095/stream_initiation.py
@@ -0,0 +1,197 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+import threading
+
+from uuid import uuid4
+
+from sleekxmpp import Iq, Message
+from sleekxmpp.exceptions import XMPPError
+from sleekxmpp.plugins import BasePlugin
+from sleekxmpp.xmlstream.handler import Callback
+from sleekxmpp.xmlstream.matcher import StanzaPath
+from sleekxmpp.xmlstream import register_stanza_plugin, JID
+from sleekxmpp.plugins.xep_0095 import stanza, SI
+
+
+log = logging.getLogger(__name__)
+
+
+SOCKS5 = 'http://jabber.org/protocol/bytestreams'
+IBB = 'http://jabber.org/protocol/ibb'
+
+
+class XEP_0095(BasePlugin):
+
+    name = 'xep_0095'
+    description = 'XEP-0095: Stream Initiation'
+    dependencies = set(['xep_0020', 'xep_0030', 'xep_0047', 'xep_0065'])
+    stanza = stanza
+
+    def plugin_init(self):
+        self._profiles = {}
+        self._methods = {}
+        self._pending_lock = threading.Lock()
+        self._pending= {}
+
+        self.register_method(SOCKS5, 'xep_0065')
+        self.register_method(IBB, 'xep_0047')
+
+        register_stanza_plugin(Iq, SI)
+        register_stanza_plugin(SI, self.xmpp['xep_0020'].stanza.FeatureNegotiation)
+
+        self.xmpp.register_handler(
+            Callback('SI Request',
+                StanzaPath('iq@type=set/si'),
+                self._handle_request))
+
+        self.api.register(self._add_pending, 'add_pending', default=True)
+        self.api.register(self._get_pending, 'get_pending', default=True)
+        self.api.register(self._del_pending, 'del_pending', default=True)
+
+    def session_bind(self, jid):
+        self.xmpp['xep_0030'].add_feature(SI.namespace)
+
+    def plugin_end(self):
+        self.xmpp.remove_handler('SI Request')
+        self.xmpp['xep_0030'].del_feature(feature=SI.namespace)
+
+    def register_profile(self, profile_name, plugin):
+        self._profiles[profile_name] = plugin
+
+    def unregister_profile(self, profile_name):
+        try:
+            del self._profiles[profile_name]
+        except KeyError:
+            pass
+
+    def register_method(self, method, plugin_name):
+        self._methods[method] = plugin_name
+
+    def _handle_request(self, iq):
+        profile = iq['si']['profile']
+        sid = iq['si']['id']
+
+        if not sid:
+            raise XMPPError(etype='modify', condition='bad-request')
+        if profile not in self._profiles:
+            raise XMPPError(
+                etype='modify',
+                condition='bad-request',
+                extension='bad-profile',
+                extension_ns=SI.namespace)
+
+        neg = iq['si']['feature_neg']['form']['fields']
+        options = neg['stream-method']['options'] or []
+        methods = []
+        for opt in options:
+            methods.append(opt['value'])
+        for method in methods:
+            if method in self._methods:
+                supported = True
+                break
+        else:
+            raise XMPPError('bad-request',
+                    extension='no-valid-streams',
+                    extension_ns=SI.namespace)
+
+        selected_method = SOCKS5 if SOCKS5 in methods else IBB
+        receiver = iq['to']
+        sender = iq['from']
+
+        self.api['add_pending'](receiver, sid, sender, {
+            'response_id': iq['id'],
+            'method': selected_method,
+            'profile': profile
+        })
+        self.xmpp.event('si_request', iq)
+
+    def offer(self, jid, sid=None, mime_type=None, profile=None,
+                    methods=None, payload=None, ifrom=None,
+                    **iqargs):
+        if sid is None:
+            sid = uuid4().hex
+        if methods is None:
+            methods = list(self._methods.keys())
+        if not isinstance(methods, (list, tuple, set)):
+            methods = [methods]
+
+        si = self.xmpp.Iq()
+        si['to'] = jid
+        si['from'] = ifrom
+        si['type'] = 'set'
+        si['si']['id'] = sid
+        si['si']['mime_type'] = mime_type
+        si['si']['profile'] = profile
+        if not isinstance(payload, (list, tuple, set)):
+            payload = [payload]
+        for item in payload:
+            si['si'].append(item)
+        si['si']['feature_neg']['form'].add_field(
+                var='stream-method',
+                ftype='list-single',
+                options=methods)
+        return si.send(**iqargs)
+
+    def accept(self, jid, sid, payload=None, ifrom=None, stream_handler=None):
+        stream = self.api['get_pending'](ifrom, sid, jid)
+        iq = self.xmpp.Iq()
+        iq['id'] = stream['response_id']
+        iq['to'] = jid
+        iq['from'] = ifrom
+        iq['type'] = 'result'
+        if payload:
+            iq['si'].append(payload)
+        iq['si']['feature_neg']['form']['type'] = 'submit'
+        iq['si']['feature_neg']['form'].add_field(
+                var='stream-method',
+                ftype='list-single',
+                value=stream['method'])
+
+        if ifrom is None:
+            ifrom = self.xmpp.boundjid
+
+        method_plugin = self._methods[stream['method']]
+        self.xmpp[method_plugin].api['preauthorize_sid'](ifrom, sid, jid)
+
+        self.api['del_pending'](ifrom, sid, jid)
+
+        if stream_handler:
+            self.xmpp.add_event_handler('stream:%s:%s' % (sid, jid),
+                    stream_handler,
+                    threaded=True,
+                    disposable=True)
+        return iq.send()
+
+    def decline(self, jid, sid, ifrom=None):
+        stream = self.api['get_pending'](ifrom, sid, jid)
+        if not stream:
+            return
+        iq = self.xmpp.Iq()
+        iq['id'] = stream['response_id']
+        iq['to'] = jid
+        iq['from'] = ifrom
+        iq['type'] = 'error'
+        iq['error']['condition'] = 'forbidden'
+        iq['error']['text'] = 'Offer declined'
+        self.api['del_pending'](ifrom, sid, jid)
+        return iq.send()
+
+    def _add_pending(self, jid, node, ifrom, data):
+        with self._pending_lock:
+            self._pending[(jid, node, ifrom)] = data
+
+    def _get_pending(self, jid, node, ifrom, data):
+        with self._pending_lock:
+            return self._pending.get((jid, node, ifrom), None)
+
+    def _del_pending(self, jid, node, ifrom, data):
+        with self._pending_lock:
+            if (jid, node, ifrom) in self._pending:
+                del self._pending[(jid, node, ifrom)]
diff --git a/sleekxmpp/plugins/xep_0096/__init__.py b/sleekxmpp/plugins/xep_0096/__init__.py
new file mode 100644
index 00000000..5f836169
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0096/__init__.py
@@ -0,0 +1,16 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+from sleekxmpp.plugins.base import register_plugin
+
+from sleekxmpp.plugins.xep_0096 import stanza
+from sleekxmpp.plugins.xep_0096.stanza import File
+from sleekxmpp.plugins.xep_0096.file_transfer import XEP_0096
+
+
+register_plugin(XEP_0096)
diff --git a/sleekxmpp/plugins/xep_0096/file_transfer.py b/sleekxmpp/plugins/xep_0096/file_transfer.py
new file mode 100644
index 00000000..6873c7f5
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0096/file_transfer.py
@@ -0,0 +1,58 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import logging
+
+from sleekxmpp import Iq, Message
+from sleekxmpp.plugins import BasePlugin
+from sleekxmpp.xmlstream.handler import Callback
+from sleekxmpp.xmlstream.matcher import StanzaPath
+from sleekxmpp.xmlstream import register_stanza_plugin, JID
+from sleekxmpp.plugins.xep_0096 import stanza, File
+
+
+log = logging.getLogger(__name__)
+
+
+class XEP_0096(BasePlugin):
+
+    name = 'xep_0096'
+    description = 'XEP-0096: SI File Transfer'
+    dependencies = set(['xep_0095'])
+    stanza = stanza
+
+    def plugin_init(self):
+        register_stanza_plugin(self.xmpp['xep_0095'].stanza.SI, File)
+
+        self.xmpp['xep_0095'].register_profile(File.namespace, self)
+
+    def session_bind(self, jid):
+        self.xmpp['xep_0030'].add_feature(File.namespace)
+
+    def plugin_end(self):
+        self.xmpp['xep_0030'].del_feature(feature=File.namespace)
+        self.xmpp['xep_0095'].unregister_profile(File.namespace, self)
+
+    def request_file_transfer(self, jid, sid=None, name=None, size=None,
+                                    desc=None, hash=None, date=None,
+                                    allow_ranged=False, mime_type=None,
+                                    **iqargs):
+        data = File()
+        data['name'] = name
+        data['size'] = size
+        data['date'] = date
+        data['desc'] = desc
+        if allow_ranged:
+            data.enable('range')
+
+        return self.xmpp['xep_0095'].offer(jid,
+                sid=sid,
+                mime_type=mime_type,
+                profile=File.namespace,
+                payload=data,
+                **iqargs)
diff --git a/sleekxmpp/plugins/xep_0096/stanza.py b/sleekxmpp/plugins/xep_0096/stanza.py
new file mode 100644
index 00000000..65eb5bc5
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0096/stanza.py
@@ -0,0 +1,48 @@
+"""
+    SleekXMPP: The Sleek XMPP Library
+    Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
+    This file is part of SleekXMPP.
+
+    See the file LICENSE for copying permission.
+"""
+
+import datetime as dt
+
+from sleekxmpp.xmlstream import ElementBase, register_stanza_plugin
+from sleekxmpp.plugins import xep_0082
+
+
+class File(ElementBase):
+    name = 'file'
+    namespace = 'http://jabber.org/protocol/si/profile/file-transfer'
+    plugin_attrib = 'file'
+    interfaces = set(['name', 'size', 'date', 'hash', 'desc'])
+    sub_interfaces = set(['desc'])
+
+    def set_size(self, value):
+        self._set_attr('size', str(value))
+
+    def get_date(self):
+        timestamp = self._get_attr('date')
+        return xep_0082.parse(timestamp)
+
+    def set_date(self, value):
+        if isinstance(value, dt.datetime):
+            value = xep_0082.format_datetime(value)
+        self._set_attr('date', value)
+
+
+class Range(ElementBase):
+    name = 'range'
+    namespace = 'http://jabber.org/protocol/si/profile/file-transfer'
+    plugin_attrib = 'range'
+    interfaces = set(['length', 'offset'])
+
+    def set_length(self, value):
+        self._set_attr('length', str(value))
+
+    def set_offset(self, value):
+        self._set_attr('offset', str(value))
+
+
+register_stanza_plugin(File, Range)