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annotate sat/plugins/plugin_xep_0352.py @ 3104:118d91c932a7

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plugin XEP-0384: OMEMO for MUC implementation: - encryption is now allowed for group chats - when an encryption is requested for a MUC, real jids or all occupants are used to encrypt the message - a cache for plain text message sent to MUC is used, because for security reason we can't encrypt message for our own device with OMEMO (that would prevent ratchet and break the prefect forward secrecy). Thus, message sent in MUC are cached for 5 min, and the decrypted version is used when found. We don't send immediately the plain text message to frontends and history because we want to keep the same MUC behaviour as for plain text, and receiving a message means that it was received and sent back by MUC service - <origin-id> is used to identify messages sent by our device - a feedback_jid is now use to use correct entity for feedback message in case of problem: with a room we have to send feedback message to the room and not the the emitter - encryptMessage now only accepts list in the renamed "entity_bare_jids" argument
author Goffi <goffi@goffi.org>
date Mon, 30 Dec 2019 20:59:46 +0100
parents ab2696e34d29
children 9d0df638c8b4
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Explicit Message Encryption
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 from twisted.words.xish import domish
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21 from sat.core.i18n import _, D_
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22 from sat.core.constants import Const as C
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23 from sat.core.log import getLogger
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24
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25 log = getLogger(__name__)
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26
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27 PLUGIN_INFO = {
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28 C.PI_NAME: "Client State Indication",
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29 C.PI_IMPORT_NAME: "XEP-0352",
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30 C.PI_TYPE: C.PLUG_TYPE_XEP,
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31 C.PI_PROTOCOLS: ["XEP-0352"],
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32 C.PI_DEPENDENCIES: [],
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33 C.PI_MAIN: "XEP_0352",
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34 C.PI_HANDLER: "no",
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35 C.PI_DESCRIPTION: D_("Notify server when frontend is not actively used, to limit "
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36 "traffic and save bandwidth and battery life"),
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37 }
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38
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39 NS_CSI = "urn:xmpp:csi:0"
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41
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42 class XEP_0352(object):
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43
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44 def __init__(self, host):
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45 log.info(_("Client State Indication plugin initialization"))
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46 self.host = host
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47 host.registerNamespace("csi", NS_CSI)
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48
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49 def isActive(self, client):
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50 try:
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51 if not client._xep_0352_enabled:
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52 return True
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53 return client._xep_0352_active
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54 except AttributeError:
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55 # _xep_0352_active can not be set if isActive is called before
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56 # profileConnected has been called
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57 log.debug("isActive called when XEP-0352 plugin has not yet set the "
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58 "attributes")
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59 return True
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60
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61 def profileConnected(self, client):
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62 if (NS_CSI, 'csi') in client.xmlstream.features:
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63 log.info(_("Client State Indication is available on this server"))
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64 client._xep_0352_enabled = True
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65 client._xep_0352_active = True
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66 else:
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67 log.warning(_("Client State Indication is not available on this server, some"
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68 " bandwidth optimisations can't be used."))
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69 client._xep_0352_enabled = False
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70
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71 def setInactive(self, client):
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72 if self.isActive(client):
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73 inactive_elt = domish.Element((NS_CSI, 'inactive'))
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74 client.send(inactive_elt)
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75 client._xep_0352_active = False
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76 log.info("inactive state set")
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78 def setActive(self, client):
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79 if not self.isActive(client):
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80 active_elt = domish.Element((NS_CSI, 'active'))
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81 client.send(active_elt)
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82 client._xep_0352_active = True
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83 log.info("active state set")