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annotate sat/plugins/plugin_xep_0280.py @ 3162:b5c058c7692e

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core (xmpp), plugin android: fixed DNS, SRV handling on Android: Android doesn't have a "/etc/resolv.conf" that Twisted expect. As a result, SRV records can't be checked correctly on connection. To work around that, DNS servers used on Android are checked when necessary (on Android plugin startup and on connectivity change), using some hacks, and Twisted is patched to use them.
author Goffi <goffi@goffi.org>
date Sun, 09 Feb 2020 23:56:42 +0100
parents 49962f9a238a
children dcebc585c29f
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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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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 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 []