view sat/plugins/plugin_xep_0070.py @ 2646:712cb4ff3e13

core: new EncryptionHandler class which manage encrypted session as a core feature: Plugin handling encryption can now register using host.registerEncryptionPlugin, and an encryption session can now be started using messageEncryptionStart bridge method. This will make encryption handling more easy, as we now know if a session is clear or e2e encrypted, and which plugin handle it.
author Goffi <goffi@goffi.org>
date Sun, 29 Jul 2018 19:22:56 +0200
parents a55a14c3cbf4
children ab2696e34d29
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#!/usr/bin/python
# -*- coding: utf-8 -*-

# SAT plugin for managing xep-0070
# Copyright (C) 2009-2016 Geoffrey POUZET (chteufleur@kingpenguin.tk)

# 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 _, D_
from sat.core.constants import Const as C
from sat.core.log import getLogger
from twisted.words.protocols.jabber import xmlstream
from twisted.words.protocols import jabber

log = getLogger(__name__)
from sat.tools import xml_tools

from wokkel import disco, iwokkel
from zope.interface import implements

try:
    from twisted.words.protocols.xmlstream import XMPPHandler
except ImportError:
    from wokkel.subprotocols import XMPPHandler


NS_HTTP_AUTH = "http://jabber.org/protocol/http-auth"

IQ = "iq"
IQ_GET = "/" + IQ + '[@type="get"]'
IQ_HTTP_AUTH_REQUEST = IQ_GET + '/confirm[@xmlns="' + NS_HTTP_AUTH + '"]'

MSG = "message"
MSG_GET = "/" + MSG + '[@type="normal"]'
MSG_HTTP_AUTH_REQUEST = MSG_GET + '/confirm[@xmlns="' + NS_HTTP_AUTH + '"]'


PLUGIN_INFO = {
    C.PI_NAME: "XEP-0070 Plugin",
    C.PI_IMPORT_NAME: "XEP-0070",
    C.PI_TYPE: "XEP",
    C.PI_PROTOCOLS: ["XEP-0070"],
    C.PI_DEPENDENCIES: [],
    C.PI_MAIN: "XEP_0070",
    C.PI_HANDLER: "yes",
    C.PI_DESCRIPTION: _("""Implementation of HTTP Requests via XMPP"""),
}


class XEP_0070(object):
    """
    Implementation for XEP 0070.
    """

    def __init__(self, host):
        log.info(_(u"Plugin XEP_0070 initialization"))
        self.host = host
        self._dictRequest = dict()

    def getHandler(self, client):
        return XEP_0070_handler(self, client.profile)

    def onHttpAuthRequestIQ(self, iq_elt, client):
        """This method is called on confirmation request received (XEP-0070 #4.5)

        @param iq_elt: IQ element
        @param client: %(doc_client)s
        """
        log.info(_("XEP-0070 Verifying HTTP Requests via XMPP (iq)"))
        self._treatHttpAuthRequest(iq_elt, IQ, client)

    def onHttpAuthRequestMsg(self, msg_elt, client):
        """This method is called on confirmation request received (XEP-0070 #4.5)

        @param msg_elt: message element
        @param client: %(doc_client)s
        """
        log.info(_("XEP-0070 Verifying HTTP Requests via XMPP (message)"))
        self._treatHttpAuthRequest(msg_elt, MSG, client)

    def _treatHttpAuthRequest(self, elt, stanzaType, client):
        elt.handled = True
        auth_elt = elt.elements(NS_HTTP_AUTH, "confirm").next()
        auth_id = auth_elt["id"]
        auth_method = auth_elt["method"]
        auth_url = auth_elt["url"]
        self._dictRequest[client] = (auth_id, auth_method, auth_url, stanzaType, elt)
        title = D_(u"Auth confirmation")
        message = D_(u"{auth_url} needs to validate your identity, do you agree?\n"
                     u"Validation code : {auth_id}\n\n"
                     u"Please check that this code is the same as on {auth_url}"
                    ).format(auth_url=auth_url, auth_id=auth_id)
        d = xml_tools.deferConfirm(self.host, message=message, title=title,
            profile=client.profile)
        d.addCallback(self._authRequestCallback, client)

    def _authRequestCallback(self, authorized, client):
        try:
            auth_id, auth_method, auth_url, stanzaType, elt = self._dictRequest.pop(
                client)
        except KeyError:
            authorized = False

        if authorized:
            if stanzaType == IQ:
                # iq
                log.debug(_(u"XEP-0070 reply iq"))
                iq_result_elt = xmlstream.toResponse(elt, "result")
                client.send(iq_result_elt)
            elif stanzaType == MSG:
                # message
                log.debug(_(u"XEP-0070 reply message"))
                msg_result_elt = xmlstream.toResponse(elt, "result")
                msg_result_elt.addChild(elt.elements(NS_HTTP_AUTH, "confirm").next())
                client.send(msg_result_elt)
        else:
            log.debug(_(u"XEP-0070 reply error"))
            result_elt = jabber.error.StanzaError("not-authorized").toResponse(elt)
            client.send(result_elt)


class XEP_0070_handler(XMPPHandler):
    implements(iwokkel.IDisco)

    def __init__(self, plugin_parent, profile):
        self.plugin_parent = plugin_parent
        self.host = plugin_parent.host
        self.profile = profile

    def connectionInitialized(self):
        self.xmlstream.addObserver(
            IQ_HTTP_AUTH_REQUEST,
            self.plugin_parent.onHttpAuthRequestIQ,
            client=self.parent,
        )
        self.xmlstream.addObserver(
            MSG_HTTP_AUTH_REQUEST,
            self.plugin_parent.onHttpAuthRequestMsg,
            client=self.parent,
        )

    def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
        return [disco.DiscoFeature(NS_HTTP_AUTH)]

    def getDiscoItems(self, requestor, target, nodeIdentifier=""):
        return []