view sat/plugins/plugin_xep_0092.py @ 3153:2c7b42f53e9a

core (xmpp): avoid starting several clients at the same time: a check is done to avoid running startConnection several times at once, which would lead to the creation of several SatXMPPEntity instances at the same time, resulting in many issues. If startConnection is called while a previous one is not finished yet, a CancelError is now raised.
author Goffi <goffi@goffi.org>
date Mon, 03 Feb 2020 13:46:24 +0100
parents 559a625a236b
children be6d91572633
line wrap: on
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#!/usr/bin/env python3


# SàT plugin for Software Version (XEP-0092)
# Copyright (C) 2009-2020 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 sat.core.i18n import _
from sat.core.constants import Const as C
from twisted.internet import reactor, defer
from twisted.words.protocols.jabber import jid
from wokkel import compat
from sat.core import exceptions
from sat.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.addMethod(
            "getSoftwareVersion",
            ".plugin",
            in_sign="ss",
            out_sign="(sss)",
            method=self._getVersion,
            async_=True,
        )
        try:
            self.host.plugins[C.TEXT_CMDS].addWhoIsCb(self._whois, 50)
        except KeyError:
            log.info(_("Text commands not available"))

    def _getVersion(self, entity_jid_s, profile_key):
        def prepareForBridge(data):
            name, version, os = data
            return (name or "", version or "", os or "")

        d = self.getVersion(jid.JID(entity_jid_s), profile_key)
        d.addCallback(prepareForBridge)
        return d

    def getVersion(self, jid_, profile_key=C.PROF_KEY_NONE):
        """ Ask version of the client that jid_ is running
        @param jid_: jid from who we want to know client's version
        @param profile_key: %(doc_profile_key)s
        @return (tuple): 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
        """
        client = self.host.getClient(profile_key)

        def getVersion(__):
            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._gotVersion)
            return d

        d = self.host.checkFeature(client, NS_VERSION, jid_)
        d.addCallback(getVersion)
        reactor.callLater(
            TIMEOUT, d.cancel
        )  # XXX: timeout needed because some clients don't answer the IQ
        return d

    def _gotVersion(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 versionCb(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 versionEb(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.getVersion(target_jid, client.profile)
        d.addCallbacks(versionCb, versionEb)
        return d