--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/plugins/plugin_xep_0092.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,142 @@
+#!/usr/bin/env python3
+
+
+# SàT plugin for Software Version (XEP-0092)
+# 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 typing import Tuple
+
+from twisted.internet import defer, reactor
+from twisted.words.protocols.jabber import jid
+from wokkel import compat
+
+from libervia.backend.core import exceptions
+from libervia.backend.core.constants import Const as C
+from libervia.backend.core.core_types import SatXMPPEntity
+from libervia.backend.core.i18n import _
+from libervia.backend.core.log import getLogger
+
+log = getLogger(__name__)
+
+NS_VERSION = "jabber:iq:version"
+TIMEOUT = 10
+
+PLUGIN_INFO = {
+    C.PI_NAME: "Software Version Plugin",
+    C.PI_IMPORT_NAME: "XEP-0092",
+    C.PI_TYPE: "XEP",
+    C.PI_PROTOCOLS: ["XEP-0092"],
+    C.PI_DEPENDENCIES: [],
+    C.PI_RECOMMENDATIONS: [C.TEXT_CMDS],
+    C.PI_MAIN: "XEP_0092",
+    C.PI_HANDLER: "no",  # version is already handler in core.xmpp module
+    C.PI_DESCRIPTION: _("""Implementation of Software Version"""),
+}
+
+
+class XEP_0092(object):
+    def __init__(self, host):
+        log.info(_("Plugin XEP_0092 initialization"))
+        self.host = host
+        host.bridge.add_method(
+            "software_version_get",
+            ".plugin",
+            in_sign="ss",
+            out_sign="(sss)",
+            method=self._get_version,
+            async_=True,
+        )
+        try:
+            self.host.plugins[C.TEXT_CMDS].add_who_is_cb(self._whois, 50)
+        except KeyError:
+            log.info(_("Text commands not available"))
+
+    def _get_version(self, entity_jid_s, profile_key):
+        def prepare_for_bridge(data):
+            name, version, os = data
+            return (name or "", version or "", os or "")
+
+        client = self.host.get_client(profile_key)
+        d = self.version_get(client, jid.JID(entity_jid_s))
+        d.addCallback(prepare_for_bridge)
+        return d
+
+    def version_get(
+        self,
+        client: SatXMPPEntity,
+        jid_: jid.JID,
+    ) -> Tuple[str, str, str]:
+        """Ask version of the client that jid_ is running
+
+        @param jid_: jid from who we want to know client's version
+        @return: a defered which fire a tuple with the following data (None if not available):
+            - name: Natural language name of the software
+            - version: specific version of the software
+            - os: operating system of the queried entity
+        """
+
+        def do_version_get(__):
+            iq_elt = compat.IQ(client.xmlstream, "get")
+            iq_elt["to"] = jid_.full()
+            iq_elt.addElement("query", NS_VERSION)
+            d = iq_elt.send()
+            d.addCallback(self._got_version)
+            return d
+
+        d = self.host.check_feature(client, NS_VERSION, jid_)
+        d.addCallback(do_version_get)
+        reactor.callLater(
+            TIMEOUT, d.cancel
+        )  # XXX: timeout needed because some clients don't answer the IQ
+        return d
+
+    def _got_version(self, iq_elt):
+        try:
+            query_elt = next(iq_elt.elements(NS_VERSION, "query"))
+        except StopIteration:
+            raise exceptions.DataError
+        ret = []
+        for name in ("name", "version", "os"):
+            try:
+                data_elt = next(query_elt.elements(NS_VERSION, name))
+                ret.append(str(data_elt))
+            except StopIteration:
+                ret.append(None)
+
+        return tuple(ret)
+
+    def _whois(self, client, whois_msg, mess_data, target_jid):
+        """Add software/OS information to whois"""
+
+        def version_cb(version_data):
+            name, version, os = version_data
+            if name:
+                whois_msg.append(_("Client name: %s") % name)
+            if version:
+                whois_msg.append(_("Client version: %s") % version)
+            if os:
+                whois_msg.append(_("Operating system: %s") % os)
+
+        def version_eb(failure):
+            failure.trap(exceptions.FeatureNotFound, defer.CancelledError)
+            if failure.check(failure, exceptions.FeatureNotFound):
+                whois_msg.append(_("Software version not available"))
+            else:
+                whois_msg.append(_("Client software version request timeout"))
+
+        d = self.version_get(client, target_jid)
+        d.addCallbacks(version_cb, version_eb)
+        return d