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annotate sat/plugins/plugin_xep_0359.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 f0f48b4deb35
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 Message Archive Management (XEP-0359)
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.org)
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7
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8 # This program is free software: you can redistribute it and/or modify
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9 # it under the terms of the GNU Affero General Public License as published by
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10 # the Free Software Foundation, either version 3 of the License, or
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11 # (at your option) any later version.
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12
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13 # This program is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 # GNU Affero General Public License for more details.
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17
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18 # You should have received a copy of the GNU Affero General Public License
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19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 import uuid
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22 from zope.interface import implementer
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23 from twisted.words.protocols.jabber import xmlstream
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24 from wokkel import disco
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25 from sat.core.constants import Const as C
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26 from sat.core import exceptions
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27 from sat.core.i18n import _
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28 from sat.core.log import getLogger
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29
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30 log = getLogger(__name__)
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31
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32
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33 PLUGIN_INFO = {
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34 C.PI_NAME: "Unique and Stable Stanza IDs",
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35 C.PI_IMPORT_NAME: "XEP-0359",
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36 C.PI_TYPE: "XEP",
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37 C.PI_PROTOCOLS: ["XEP-0359"],
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38 C.PI_MAIN: "XEP_0359",
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39 C.PI_HANDLER: "yes",
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40 C.PI_DESCRIPTION: _("""Implementation of Unique and Stable Stanza IDs"""),
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41 }
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42
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43 NS_SID = "urn:xmpp:sid:0"
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44
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45
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46 class XEP_0359(object):
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47
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48 def __init__(self, host):
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49 log.info(_("Unique and Stable Stanza IDs plugin initialization"))
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50 self.host = host
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51 host.registerNamespace("stanza_id", NS_SID)
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52 host.trigger.add("message_parse", self._message_parseTrigger)
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53
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54 def _message_parseTrigger(self, client, message_elt, mess_data):
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55 """Check if message has a stanza-id"""
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56 stanza_id = self.getStanzaId(message_elt, client.jid.userhostJID())
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57 if stanza_id is not None:
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58 mess_data['extra']['stanza_id'] = stanza_id
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59 return True
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60
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61 def getStanzaId(self, element, by):
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62 """Return stanza-id if found in element
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63
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64 @param element(domish.Element): element to parse
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65 @param by(jid.JID): entity which should have set a stanza-id
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66 @return (unicode, None): stanza-id if found
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67 """
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68 stanza_id = None
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69 for stanza_elt in element.elements(NS_SID, "stanza-id"):
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70 if stanza_elt.getAttribute("by") == by.full():
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71 if stanza_id is not None:
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72 # we must not have more than one element (§3 #4)
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73 raise exceptions.DataError(
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74 "More than one corresponding stanza-id found!")
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75 stanza_id = stanza_elt.getAttribute("id")
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76 # we don't break to be sure that there is no more than one element
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77 # with this "by" attribute
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78
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79 return stanza_id
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80
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81 def addStanzaId(self, client, element, stanza_id, by=None):
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82 """Add a <stanza-id/> to a stanza
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83
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84 @param element(domish.Element): stanza where the <stanza-id/> must be added
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85 @param stanza_id(unicode): id to use
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86 @param by(jid.JID, None): jid to use or None to use client.jid
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87 """
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88 sid_elt = element.addElement((NS_SID, "stanza-id"))
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89 sid_elt["by"] = client.jid.userhost() if by is None else by.userhost()
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90 sid_elt["id"] = stanza_id
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91
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92 def getOriginId(self, element):
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93 """Return origin-id if found in element
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94
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95 @param element(domish.Element): element to parse
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96 @return (unicode, None): origin-id if found
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97 """
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98 try:
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99 origin_elt = next(element.elements(NS_SID, "origin-id"))
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100 except StopIteration:
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101 return None
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102 else:
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103 return origin_elt.getAttribute("id")
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104
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105 def addOriginId(self, element, origin_id=None):
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106 """Add a <origin-id/> to a stanza
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107
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108 @param element(domish.Element): stanza where the <origin-id/> must be added
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109 @param origin_id(str): id to use, None to automatically generate
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110 @return (str): origin_id
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111 """
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112 if origin_id is None:
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113 origin_id = str(uuid.uuid4())
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114 sid_elt = element.addElement((NS_SID, "origin-id"))
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115 sid_elt["id"] = origin_id
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116 return origin_id
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117
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118 def getHandler(self, client):
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119 return XEP_0359_handler()
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120
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121
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122 @implementer(disco.IDisco)
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123 class XEP_0359_handler(xmlstream.XMPPHandler):
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124
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125 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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Goffi <goffi@goffi.org>
parents:
diff changeset
126 return [disco.DiscoFeature(NS_SID)]
5849dcaab99d plugin XEP-0359: Unique and Stable Stanza IDs implementation, first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
127
5849dcaab99d plugin XEP-0359: Unique and Stable Stanza IDs implementation, first draft
Goffi <goffi@goffi.org>
parents:
diff changeset
128 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
5849dcaab99d plugin XEP-0359: Unique and Stable Stanza IDs implementation, first draft
Goffi <goffi@goffi.org>
parents:
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129 return []