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annotate sat/plugins/plugin_xep_0280.py @ 3141:49962f9a238a

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plugin XEP-0280: handle CCed messages without "to"
author Goffi <goffi@goffi.org>
date Wed, 29 Jan 2020 17:39:00 +0100
parents 559a625a236b
children dcebc585c29f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT plugin for managing xep-0280
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5 # Copyright (C) 2009-2020 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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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 sat.core.i18n import _, D_
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21 from sat.core.log import getLogger
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22
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23 log = getLogger(__name__)
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24 from sat.core import exceptions
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25 from sat.core.constants import Const as C
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26 from twisted.words.protocols.jabber.error import StanzaError
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27 from twisted.internet import defer
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28 from wokkel import disco, iwokkel
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29 from zope.interface import implementer
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30
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31 try:
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32 from twisted.words.protocols.xmlstream import XMPPHandler
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33 except ImportError:
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34 from wokkel.subprotocols import XMPPHandler
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37 PARAM_CATEGORY = "Misc"
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38 PARAM_NAME = "carbon"
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39 PARAM_LABEL = D_("Message carbons")
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40 NS_CARBONS = "urn:xmpp:carbons:2"
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41
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42 PLUGIN_INFO = {
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43 C.PI_NAME: "XEP-0280 Plugin",
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44 C.PI_IMPORT_NAME: "XEP-0280",
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45 C.PI_TYPE: "XEP",
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46 C.PI_PROTOCOLS: ["XEP-0280"],
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47 C.PI_DEPENDENCIES: [],
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48 C.PI_MAIN: "XEP_0280",
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49 C.PI_HANDLER: "yes",
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50 C.PI_DESCRIPTION: D_("""Implementation of Message Carbons"""),
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51 }
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54 class XEP_0280(object):
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55 #  TODO: param is only checked at profile connection
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56 # activate carbons on param change even after profile connection
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57 # TODO: chat state notifications are not handled yet (and potentially other XEPs?)
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58
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59 params = """
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60 <params>
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61 <individual>
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62 <category name="{category_name}" label="{category_label}">
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63 <param name="{param_name}" label="{param_label}" value="true" type="bool" security="0" />
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64 </category>
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65 </individual>
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66 </params>
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67 """.format(
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68 category_name=PARAM_CATEGORY,
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69 category_label=D_(PARAM_CATEGORY),
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70 param_name=PARAM_NAME,
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71 param_label=PARAM_LABEL,
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72 )
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73
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74 def __init__(self, host):
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75 log.info(_("Plugin XEP_0280 initialization"))
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76 self.host = host
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77 host.memory.updateParams(self.params)
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78 host.trigger.add("MessageReceived", self.messageReceivedTrigger, priority=200000)
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79
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80 def getHandler(self, client):
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81 return XEP_0280_handler()
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82
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83 def setPrivate(self, message_elt):
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84 """Add a <private/> element to a message
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85
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86 this method is intented to be called on final domish.Element by other plugins
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87 (in particular end 2 end encryption plugins)
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88 @param message_elt(domish.Element): <message> stanza
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89 """
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90 if message_elt.name != "message":
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91 log.error("addPrivateElt must be used with <message> stanzas")
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92 return
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93 message_elt.addElement((NS_CARBONS, "private"))
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94
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95 @defer.inlineCallbacks
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96 def profileConnected(self, client):
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97 """activate message carbons on connection if possible and activated in config"""
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98 activate = self.host.memory.getParamA(
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99 PARAM_NAME, PARAM_CATEGORY, profile_key=client.profile
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100 )
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101 if not activate:
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102 log.info(_("Not activating message carbons as requested in params"))
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103 return
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104 try:
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105 yield self.host.checkFeatures(client, (NS_CARBONS,))
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106 except exceptions.FeatureNotFound:
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107 log.warning(_("server doesn't handle message carbons"))
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108 else:
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109 log.info(_("message carbons available, enabling it"))
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110 iq_elt = client.IQ()
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111 iq_elt.addElement((NS_CARBONS, "enable"))
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112 try:
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113 yield iq_elt.send()
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114 except StanzaError as e:
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115 log.warning("Can't activate message carbons: {}".format(e))
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116 else:
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117 log.info(_("message carbons activated"))
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118
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119 def messageReceivedTrigger(self, client, message_elt, post_treat):
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120 """get message and handle it if carbons namespace is present"""
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121 carbons_elt = None
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122 for e in message_elt.elements():
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123 if e.uri == NS_CARBONS:
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124 carbons_elt = e
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125 break
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126
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127 if carbons_elt is None:
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128 # this is not a message carbons,
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129 # we continue normal behaviour
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130 return True
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131
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132 if message_elt["from"] != client.jid.userhost():
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133 log.warning(
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134 "The message carbon received is not from our server, hack attempt?\n{xml}".format(
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135 xml=message_elt.toXml()
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136 )
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137 )
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138 return
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139 forwarded_elt = next(carbons_elt.elements(C.NS_FORWARD, "forwarded"))
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140 cc_message_elt = next(forwarded_elt.elements(C.NS_CLIENT, "message"))
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141
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142 # we replace the wrapping message with the CCed one
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143 # and continue the normal behaviour
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144 if carbons_elt.name == "received":
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145 message_elt["from"] = cc_message_elt["from"]
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146 elif carbons_elt.name == "sent":
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147 try:
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148 message_elt["to"] = cc_message_elt["to"]
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149 except KeyError:
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150 # we may not have "to" in case of message from ourself (from an other
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151 # device)
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152 pass
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153 else:
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154 log.warning(
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155 "invalid message carbons received:\n{xml}".format(
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156 xml=message_elt.toXml()
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157 )
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158 )
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159 return False
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160
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161 del message_elt.children[:]
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162 for c in cc_message_elt.children:
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163 message_elt.addChild(c)
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164
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165 return True
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166
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167 @implementer(iwokkel.IDisco)
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168 class XEP_0280_handler(XMPPHandler):
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169
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170 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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171 return [disco.DiscoFeature(NS_CARBONS)]
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172
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173 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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174 return []