--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/plugins/plugin_xep_0261.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+
+
+# SAT plugin for Jingle (XEP-0261)
+# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from libervia.backend.core.i18n import _
+from libervia.backend.core.constants import Const as C
+from libervia.backend.core.log import getLogger
+
+log = getLogger(__name__)
+from wokkel import disco, iwokkel
+from zope.interface import implementer
+from twisted.words.xish import domish
+import uuid
+
+try:
+    from twisted.words.protocols.xmlstream import XMPPHandler
+except ImportError:
+    from wokkel.subprotocols import XMPPHandler
+
+
+NS_JINGLE_IBB = "urn:xmpp:jingle:transports:ibb:1"
+
+PLUGIN_INFO = {
+    C.PI_NAME: "Jingle In-Band Bytestreams",
+    C.PI_IMPORT_NAME: "XEP-0261",
+    C.PI_TYPE: "XEP",
+    C.PI_MODES: C.PLUG_MODE_BOTH,
+    C.PI_PROTOCOLS: ["XEP-0261"],
+    C.PI_DEPENDENCIES: ["XEP-0166", "XEP-0047"],
+    C.PI_MAIN: "XEP_0261",
+    C.PI_HANDLER: "yes",
+    C.PI_DESCRIPTION: _("""Implementation of Jingle In-Band Bytestreams"""),
+}
+
+
+class XEP_0261(object):
+    NAMESPACE = NS_JINGLE_IBB  # used by XEP-0260 plugin for transport-replace
+
+    def __init__(self, host):
+        log.info(_("plugin Jingle In-Band Bytestreams"))
+        self.host = host
+        self._j = host.plugins["XEP-0166"]  # shortcut to access jingle
+        self._ibb = host.plugins["XEP-0047"]  # and in-band bytestream
+        self._j.register_transport(
+            NS_JINGLE_IBB, self._j.TRANSPORT_STREAMING, self, -10000
+        )  # must be the lowest priority
+
+    def get_handler(self, client):
+        return XEP_0261_handler()
+
+    def jingle_session_init(self, client, session, content_name):
+        transport_elt = domish.Element((NS_JINGLE_IBB, "transport"))
+        content_data = session["contents"][content_name]
+        transport_data = content_data["transport_data"]
+        transport_data["block_size"] = self._ibb.BLOCK_SIZE
+        transport_elt["block-size"] = str(transport_data["block_size"])
+        transport_elt["sid"] = transport_data["sid"] = str(uuid.uuid4())
+        return transport_elt
+
+    def jingle_handler(self, client, action, session, content_name, transport_elt):
+        content_data = session["contents"][content_name]
+        transport_data = content_data["transport_data"]
+        if action in (
+            self._j.A_SESSION_ACCEPT,
+            self._j.A_ACCEPTED_ACK,
+            self._j.A_TRANSPORT_ACCEPT,
+        ):
+            pass
+        elif action in (self._j.A_SESSION_INITIATE, self._j.A_TRANSPORT_REPLACE):
+            transport_data["sid"] = transport_elt["sid"]
+        elif action in (self._j.A_START, self._j.A_PREPARE_RESPONDER):
+            local_jid = session["local_jid"]
+            peer_jid = session["peer_jid"]
+            sid = transport_data["sid"]
+            stream_object = content_data["stream_object"]
+            if action == self._j.A_START:
+                block_size = transport_data["block_size"]
+                d = self._ibb.start_stream(
+                    client, stream_object, local_jid, peer_jid, sid, block_size
+                )
+                d.chainDeferred(content_data["finished_d"])
+            else:
+                d = self._ibb.create_session(
+                    client, stream_object, local_jid, peer_jid, sid)
+                d.chainDeferred(content_data["finished_d"])
+        else:
+            log.warning("FIXME: unmanaged action {}".format(action))
+        return transport_elt
+
+
+@implementer(iwokkel.IDisco)
+class XEP_0261_handler(XMPPHandler):
+
+    def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
+        return [disco.DiscoFeature(NS_JINGLE_IBB)]
+
+    def getDiscoItems(self, requestor, target, nodeIdentifier=""):
+        return []