Mercurial > libervia-backend
annotate libervia/backend/plugins/plugin_xep_0374.py @ 4189:04cd749de818
docker (backend-dev-demo): command renaming + add a bookmark to avoid empty chat
author | Goffi <goffi@goffi.org> |
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date | Mon, 11 Dec 2023 00:54:01 +0100 |
parents | 7c5654c54fed |
children | 0d7bb4df2343 |
rev | line source |
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1 #!/usr/bin/env python3 |
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2 |
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3 # Libervia plugin for OpenPGP for XMPP Instant Messaging |
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4 # Copyright (C) 2022-2022 Tim Henkes (me@syndace.dev) |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 from typing import Dict, Optional, Set, cast |
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20 |
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21 from typing_extensions import Final |
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22 from wokkel import muc # type: ignore[import] |
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23 |
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24 from libervia.backend.core import exceptions |
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25 from libervia.backend.core.constants import Const as C |
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26 from libervia.backend.core.core_types import SatXMPPEntity |
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27 from libervia.backend.core.i18n import _, D_ |
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28 from libervia.backend.core.log import getLogger, Logger |
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29 from libervia.backend.core.main import LiberviaBackend |
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30 from libervia.backend.core.xmpp import SatXMPPClient |
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31 from libervia.backend.plugins.plugin_xep_0045 import XEP_0045 |
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32 from libervia.backend.plugins.plugin_xep_0334 import XEP_0334 |
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33 from libervia.backend.plugins.plugin_xep_0373 import NS_OX, XEP_0373, TrustLevel |
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34 from libervia.backend.tools import xml_tools |
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35 from twisted.internet import defer |
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36 from twisted.words.protocols.jabber import jid |
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37 from twisted.words.xish import domish |
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38 |
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39 |
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40 __all__ = [ # pylint: disable=unused-variable |
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41 "PLUGIN_INFO", |
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42 "XEP_0374", |
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43 "NS_OXIM" |
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44 ] |
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45 |
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46 |
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47 log = cast(Logger, getLogger(__name__)) # type: ignore[no-untyped-call] |
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48 |
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49 |
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50 PLUGIN_INFO = { |
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51 C.PI_NAME: "OXIM", |
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52 C.PI_IMPORT_NAME: "XEP-0374", |
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53 C.PI_TYPE: "SEC", |
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54 C.PI_PROTOCOLS: [ "XEP-0374" ], |
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55 C.PI_DEPENDENCIES: [ "XEP-0334", "XEP-0373" ], |
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56 C.PI_RECOMMENDATIONS: [ "XEP-0045" ], |
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57 C.PI_MAIN: "XEP_0374", |
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58 C.PI_HANDLER: "no", |
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59 C.PI_DESCRIPTION: _("""Implementation of OXIM"""), |
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60 } |
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61 |
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62 |
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63 # The disco feature |
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64 NS_OXIM: Final = "urn:xmpp:openpgp:im:0" |
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65 |
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66 |
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67 class XEP_0374: |
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68 """ |
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69 Plugin equipping Libervia with OXIM capabilities under the ``urn:xmpp:openpgp:im:0`` |
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70 namespace. MUC messages are supported next to one to one messages. For trust |
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71 management, the two trust models "BTBV" and "manual" are supported. |
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72 """ |
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73 |
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74 def __init__(self, sat: LiberviaBackend) -> None: |
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75 """ |
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76 @param sat: The SAT instance. |
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77 """ |
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78 |
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79 self.__sat = sat |
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80 |
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81 # Plugins |
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82 self.__xep_0045 = cast(Optional[XEP_0045], sat.plugins.get("XEP-0045")) |
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83 self.__xep_0334 = cast(XEP_0334, sat.plugins["XEP-0334"]) |
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84 self.__xep_0373 = cast(XEP_0373, sat.plugins["XEP-0373"]) |
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85 |
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86 # Triggers |
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87 sat.trigger.add( |
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88 "message_received", |
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89 self.__message_received_trigger, |
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90 priority=100050 |
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91 ) |
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92 sat.trigger.add("send", self.__send_trigger, priority=0) |
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93 |
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94 # Register the encryption plugin |
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95 sat.register_encryption_plugin(self, "OXIM", NS_OX, 102) |
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96 |
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97 async def get_trust_ui( # pylint: disable=invalid-name |
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98 self, |
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99 client: SatXMPPClient, |
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100 entity: jid.JID |
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101 ) -> xml_tools.XMLUI: |
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102 """ |
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103 @param client: The client. |
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104 @param entity: The entity whose device trust levels to manage. |
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105 @return: An XMLUI instance which opens a form to manage the trust level of all |
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106 devices belonging to the entity. |
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107 """ |
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108 |
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109 return await self.__xep_0373.get_trust_ui(client, entity) |
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110 |
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111 @staticmethod |
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112 def __get_joined_muc_users( |
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113 client: SatXMPPClient, |
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114 xep_0045: XEP_0045, |
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115 room_jid: jid.JID |
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116 ) -> Set[jid.JID]: |
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117 """ |
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118 @param client: The client. |
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119 @param xep_0045: A MUC plugin instance. |
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120 @param room_jid: The room JID. |
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121 @return: A set containing the bare JIDs of the MUC participants. |
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122 @raise InternalError: if the MUC is not joined or the entity information of a |
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123 participant isn't available. |
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124 """ |
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125 |
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126 bare_jids: Set[jid.JID] = set() |
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127 |
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128 try: |
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129 room = cast(muc.Room, xep_0045.get_room(client, room_jid)) |
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130 except exceptions.NotFound as e: |
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131 raise exceptions.InternalError( |
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132 "Participant list of unjoined MUC requested." |
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133 ) from e |
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134 |
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135 for user in cast(Dict[str, muc.User], room.roster).values(): |
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136 entity = cast(Optional[SatXMPPEntity], user.entity) |
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137 if entity is None: |
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138 raise exceptions.InternalError( |
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139 f"Participant list of MUC requested, but the entity information of" |
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140 f" the participant {user} is not available." |
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141 ) |
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142 |
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143 bare_jids.add(entity.jid.userhostJID()) |
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144 |
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145 return bare_jids |
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146 |
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147 async def __message_received_trigger( |
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148 self, |
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149 client: SatXMPPClient, |
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150 message_elt: domish.Element, |
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151 post_treat: defer.Deferred |
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152 ) -> bool: |
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153 """ |
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154 @param client: The client which received the message. |
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155 @param message_elt: The message element. Can be modified. |
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156 @param post_treat: A deferred which evaluates to a :class:`MessageData` once the |
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157 message has fully progressed through the message receiving flow. Can be used |
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158 to apply treatments to the fully processed message, like marking it as |
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159 encrypted. |
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160 @return: Whether to continue the message received flow. |
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161 """ |
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162 sender_jid = jid.JID(message_elt["from"]) |
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163 feedback_jid: jid.JID |
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164 |
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165 message_type = message_elt.getAttribute("type", "unknown") |
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166 is_muc_message = message_type == C.MESS_TYPE_GROUPCHAT |
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167 if is_muc_message: |
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168 if self.__xep_0045 is None: |
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169 log.warning( |
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170 "Ignoring MUC message since plugin XEP-0045 is not available." |
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171 ) |
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172 # Can't handle a MUC message without XEP-0045, let the flow continue |
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173 # normally |
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174 return True |
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175 |
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176 room_jid = feedback_jid = sender_jid.userhostJID() |
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177 |
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178 try: |
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179 room = cast(muc.Room, self.__xep_0045.get_room(client, room_jid)) |
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180 except exceptions.NotFound: |
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181 log.warning( |
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182 f"Ignoring MUC message from a room that has not been joined:" |
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183 f" {room_jid}" |
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184 ) |
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185 # Whatever, let the flow continue |
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186 return True |
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187 |
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188 sender_user = cast(Optional[muc.User], room.getUser(sender_jid.resource)) |
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189 if sender_user is None: |
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190 log.warning( |
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191 f"Ignoring MUC message from room {room_jid} since the sender's user" |
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192 f" wasn't found {sender_jid.resource}" |
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193 ) |
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194 # Whatever, let the flow continue |
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195 return True |
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196 |
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197 sender_user_jid = cast(Optional[jid.JID], sender_user.entity) |
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198 if sender_user_jid is None: |
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199 log.warning( |
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200 f"Ignoring MUC message from room {room_jid} since the sender's bare" |
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201 f" JID couldn't be found from its user information: {sender_user}" |
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202 ) |
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203 # Whatever, let the flow continue |
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204 return True |
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205 |
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206 sender_jid = sender_user_jid |
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207 else: |
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208 # I'm not sure why this check is required, this code is copied from XEP-0384 |
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209 if sender_jid.userhostJID() == client.jid.userhostJID(): |
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210 try: |
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211 feedback_jid = jid.JID(message_elt["to"]) |
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212 except KeyError: |
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213 feedback_jid = client.server_jid |
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214 else: |
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215 feedback_jid = sender_jid |
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216 |
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217 sender_bare_jid = sender_jid.userhost() |
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218 |
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219 openpgp_elt = cast(Optional[domish.Element], next( |
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220 message_elt.elements(NS_OX, "openpgp"), |
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221 None |
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222 )) |
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223 |
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224 if openpgp_elt is None: |
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225 # None of our business, let the flow continue |
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226 return True |
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227 |
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228 try: |
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229 payload_elt, timestamp = await self.__xep_0373.unpack_openpgp_element( |
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230 client, |
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231 openpgp_elt, |
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232 "signcrypt", |
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233 jid.JID(sender_bare_jid) |
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234 ) |
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235 except Exception as e: |
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236 # TODO: More specific exception handling |
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237 log.warning(_("Can't decrypt message: {reason}\n{xml}").format( |
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238 reason=e, |
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239 xml=message_elt.toXml() |
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240 )) |
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241 client.feedback( |
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242 feedback_jid, |
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243 D_( |
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244 f"An OXIM message from {sender_jid.full()} can't be decrypted:" |
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245 f" {e}" |
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246 ), |
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247 { C.MESS_EXTRA_INFO: C.EXTRA_INFO_DECR_ERR } |
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248 ) |
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249 # No point in further processing this message |
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250 return False |
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251 |
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252 message_elt.children.remove(openpgp_elt) |
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253 |
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254 log.debug(f"OXIM message of type {message_type} received from {sender_bare_jid}") |
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255 |
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256 # Remove all body elements from the original element, since those act as |
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257 # fallbacks in case the encryption protocol is not supported |
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258 for child in message_elt.elements(): |
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259 if child.name == "body": |
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260 message_elt.children.remove(child) |
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261 |
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262 # Move all extension elements from the payload to the stanza root |
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263 # TODO: There should probably be explicitly forbidden elements here too, just as |
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264 # for XEP-0420 |
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265 for child in list(payload_elt.elements()): |
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266 # Remove the child from the content element |
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267 payload_elt.children.remove(child) |
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268 |
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269 # Add the child to the stanza |
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270 message_elt.addChild(child) |
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271 |
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272 # Mark the message as trusted or untrusted. Undecided counts as untrusted here. |
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273 trust_level = TrustLevel.UNDECIDED # TODO: Load the actual trust level |
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274 if trust_level is TrustLevel.TRUSTED: |
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275 post_treat.addCallback(client.encryption.mark_as_trusted) |
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276 else: |
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277 post_treat.addCallback(client.encryption.mark_as_untrusted) |
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278 |
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279 # Mark the message as originally encrypted |
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280 post_treat.addCallback( |
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281 client.encryption.mark_as_encrypted, |
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282 namespace=NS_OX |
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283 ) |
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284 |
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285 # Message processed successfully, continue with the flow |
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286 return True |
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287 |
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288 async def __send_trigger(self, client: SatXMPPClient, stanza: domish.Element) -> bool: |
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289 """ |
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290 @param client: The client sending this message. |
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291 @param stanza: The stanza that is about to be sent. Can be modified. |
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292 @return: Whether the send message flow should continue or not. |
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293 """ |
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294 # OXIM only handles message stanzas |
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295 if stanza.name != "message": |
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296 return True |
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297 |
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298 # Get the intended recipient |
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299 recipient = stanza.getAttribute("to", None) |
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300 if recipient is None: |
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301 raise exceptions.InternalError( |
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302 f"Message without recipient encountered. Blocking further processing to" |
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303 f" avoid leaking plaintext data: {stanza.toXml()}" |
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304 ) |
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305 |
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306 # Parse the JID |
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307 recipient_bare_jid = jid.JID(recipient).userhostJID() |
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308 |
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309 # Check whether encryption with OXIM is requested |
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310 encryption = client.encryption.getSession(recipient_bare_jid) |
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311 |
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312 if encryption is None: |
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313 # Encryption is not requested for this recipient |
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314 return True |
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315 |
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316 if encryption["plugin"].namespace != NS_OX: |
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317 # Encryption is requested for this recipient, but not with OXIM |
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318 return True |
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319 |
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320 # All pre-checks done, we can start encrypting! |
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321 await self.__encrypt( |
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322 client, |
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323 stanza, |
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324 recipient_bare_jid, |
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325 stanza.getAttribute("type", "unkown") == C.MESS_TYPE_GROUPCHAT |
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326 ) |
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327 |
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328 # Add a store hint if this is a message stanza |
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329 self.__xep_0334.add_hint_elements(stanza, [ "store" ]) |
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330 |
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331 # Let the flow continue. |
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332 return True |
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333 |
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334 async def __encrypt( |
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335 self, |
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336 client: SatXMPPClient, |
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337 stanza: domish.Element, |
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338 recipient_jid: jid.JID, |
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339 is_muc_message: bool |
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340 ) -> None: |
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341 """ |
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342 @param client: The client. |
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343 @param stanza: The stanza, which is modified by this call. |
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344 @param recipient_jid: The JID of the recipient. Can be a bare (aka "userhost") JID |
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345 but doesn't have to. |
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346 @param is_muc_message: Whether the stanza is a message stanza to a MUC room. |
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347 |
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348 @warning: The calling code MUST take care of adding the store message processing |
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349 hint to the stanza if applicable! This can be done before or after this call, |
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350 the order doesn't matter. |
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351 """ |
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352 |
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353 recipient_bare_jids: Set[jid.JID] |
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354 feedback_jid: jid.JID |
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355 |
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356 if is_muc_message: |
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357 if self.__xep_0045 is None: |
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358 raise exceptions.InternalError( |
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359 "Encryption of MUC message requested, but plugin XEP-0045 is not" |
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360 " available." |
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361 ) |
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362 |
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363 room_jid = feedback_jid = recipient_jid.userhostJID() |
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364 |
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365 recipient_bare_jids = self.__get_joined_muc_users( |
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366 client, |
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367 self.__xep_0045, |
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368 room_jid |
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369 ) |
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370 else: |
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371 recipient_bare_jids = { recipient_jid.userhostJID() } |
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372 feedback_jid = recipient_jid.userhostJID() |
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373 |
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374 log.debug( |
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375 f"Intercepting message that is to be encrypted by {NS_OX} for" |
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376 f" {recipient_bare_jids}" |
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377 ) |
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378 |
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379 signcrypt_elt, payload_elt = \ |
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380 self.__xep_0373.build_signcrypt_element(recipient_bare_jids) |
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381 |
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382 # Move elements from the stanza to the content element. |
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383 # TODO: There should probably be explicitly forbidden elements here too, just as |
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384 # for XEP-0420 |
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385 for child in list(stanza.elements()): |
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386 if child.name == "openpgp" and child.uri == NS_OX: |
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387 log.debug("not re-encrypting encrypted OX element") |
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388 continue |
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389 # Remove the child from the stanza |
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390 stanza.children.remove(child) |
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391 |
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392 # A namespace of ``None`` can be used on domish elements to inherit the |
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393 # namespace from the parent. When moving elements from the stanza root to |
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394 # the content element, however, we don't want elements to inherit the |
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395 # namespace of the content element. Thus, check for elements with ``None`` |
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396 # for their namespace and set the namespace to jabber:client, which is the |
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397 # namespace of the parent element. |
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398 if child.uri is None: |
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399 child.uri = C.NS_CLIENT |
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400 child.defaultUri = C.NS_CLIENT |
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401 |
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402 # Add the child with corrected namespaces to the content element |
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403 payload_elt.addChild(child) |
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404 |
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405 try: |
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406 openpgp_elt = await self.__xep_0373.build_openpgp_element( |
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407 client, |
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408 signcrypt_elt, |
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409 recipient_bare_jids |
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410 ) |
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411 except Exception as e: |
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412 msg = _( |
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413 # pylint: disable=consider-using-f-string |
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414 "Can't encrypt message for {entities}: {reason}".format( |
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415 entities=', '.join(jid.userhost() for jid in recipient_bare_jids), |
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416 reason=e |
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417 ) |
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418 ) |
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419 log.warning(msg) |
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420 client.feedback(feedback_jid, msg, { |
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421 C.MESS_EXTRA_INFO: C.EXTRA_INFO_ENCR_ERR |
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422 }) |
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423 raise e |
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424 |
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425 stanza.addChild(openpgp_elt) |