--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/plugins/plugin_xep_0049.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+
+
+# SAT plugin for managing xep-0049
+# 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 compat
+from twisted.words.xish import domish
+
+
+PLUGIN_INFO = {
+    C.PI_NAME: "XEP-0049 Plugin",
+    C.PI_IMPORT_NAME: "XEP-0049",
+    C.PI_TYPE: "XEP",
+    C.PI_PROTOCOLS: ["XEP-0049"],
+    C.PI_DEPENDENCIES: [],
+    C.PI_MAIN: "XEP_0049",
+    C.PI_HANDLER: "no",
+    C.PI_DESCRIPTION: _("""Implementation of private XML storage"""),
+}
+
+
+class XEP_0049(object):
+    NS_PRIVATE = "jabber:iq:private"
+
+    def __init__(self, host):
+        log.info(_("Plugin XEP-0049 initialization"))
+        self.host = host
+
+    def private_xml_store(self, element, profile_key):
+        """Store private data
+        @param element: domish.Element to store (must have a namespace)
+        @param profile_key: %(doc_profile_key)s
+
+        """
+        assert isinstance(element, domish.Element)
+        client = self.host.get_client(profile_key)
+        # XXX: feature announcement in disco#info is not mandatory in XEP-0049, so we have to try to use private XML, and react according to the answer
+        iq_elt = compat.IQ(client.xmlstream)
+        query_elt = iq_elt.addElement("query", XEP_0049.NS_PRIVATE)
+        query_elt.addChild(element)
+        return iq_elt.send()
+
+    def private_xml_get(self, node_name, namespace, profile_key):
+        """Store private data
+        @param node_name: name of the node to get
+        @param namespace: namespace of the node to get
+        @param profile_key: %(doc_profile_key)s
+        @return (domish.Element): a deferred which fire the stored data
+
+        """
+        client = self.host.get_client(profile_key)
+        # XXX: see private_xml_store note about feature checking
+        iq_elt = compat.IQ(client.xmlstream, "get")
+        query_elt = iq_elt.addElement("query", XEP_0049.NS_PRIVATE)
+        query_elt.addElement(node_name, namespace)
+
+        def get_cb(answer_iq_elt):
+            answer_query_elt = next(answer_iq_elt.elements(XEP_0049.NS_PRIVATE, "query"))
+            return answer_query_elt.firstChildElement()
+
+        d = iq_elt.send()
+        d.addCallback(get_cb)
+        return d