Mercurial > libervia-web

annotate browser/sat_browser/otrjs_wrapper.py @ 1199:b300eaec53b6

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server: don't raise error anymore if themes_dir is invalid or legacy blog can't be created: legacy blog will be entirely removed with 0.8 release, and themes_dir is only used by it. This patch limit troubles with this old code by not raising an error anymore if option is wrong or if the legacy blog can't be created. fix 317
author Goffi <goffi@goffi.org>
date Tue, 09 Jul 2019 20:20:46 +0200
parents 2af117bfe6cc
children
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Libervia wrapper for otr.js
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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 """This file is a wrapper for otr.js. It partially reproduces the usage
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22 (modules, classes and attributes names) and behavior of potr, so you
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23 can easily adapt some code based on potr to Pyjamas applications.
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24
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25 potr is released under the GNU LESSER GENERAL PUBLIC LICENSE Version 3
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26 - https://github.com/python-otr/pure-python-otr/blob/master/LICENSE
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27
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28 otr.js is released under the Mozilla Public Licence Version 2.0
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29 - https://github.com/arlolra/otr/blob/master/license
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30 """
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31
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32 from __pyjamas__ import JS
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33
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34 # should you re-use this class outside SàT, you can import __pyjamas__.console as log instead
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35 from sat.core.log import getLogger
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36 log = getLogger(__name__)
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37
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38
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39 # XXX: pyjamas can't probably import more than one JS file, it messes the order.
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40 # XXX: pyjamas needs the file to be in the compilation directory - no submodule.
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41 # XXX: pyjamas needs the imported file to end with a empty line or semi-column.
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42 # FIXME: fix these bugs upstream in Pyjamas
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43 import otr.min.js
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44
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45
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46 def isSupported():
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47 JS("""return (typeof OTR !== 'undefined');""")
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48
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49
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50 if not isSupported():
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51 # see https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues#Browser_Compatibility
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52 log.error('Your browser is not implementing CSPRNG: OTR has been disabled.')
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53 raise ImportError('CSPRNG is not supported by your browser')
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54
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55
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56 class context(object):
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57
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58 # Pre-declare these attributes to avoid the pylint "undefined variable" errors
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59 STATUS_SEND_QUERY = None
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60 STATUS_AKE_INIT = None
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61 STATUS_AKE_SUCCESS = None
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62 STATUS_END_OTR = None
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63 STATE_PLAINTEXT = None
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64 STATE_ENCRYPTED = None
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65 STATE_FINISHED = None
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66 OTR_TAG = None
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67 OTR_VERSION_2 = None
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68 OTR_VERSION_3 = None
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69 WHITESPACE_TAG = None
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70 WHITESPACE_TAG_V2 = None
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71 WHITESPACE_TAG_V3 = None
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72
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73 JS("""
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74 $cls_definition['STATUS_SEND_QUERY'] = OTR.CONST.STATUS_SEND_QUERY;
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75 $cls_definition['STATUS_AKE_INIT'] = OTR.CONST.STATUS_AKE_INIT;
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76 $cls_definition['STATUS_AKE_SUCCESS'] = OTR.CONST.STATUS_AKE_SUCCESS;
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77 $cls_definition['STATUS_END_OTR'] = OTR.CONST.STATUS_END_OTR;
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78 $cls_definition['STATE_PLAINTEXT'] = OTR.CONST.MSGSTATE_PLAINTEXT;
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79 $cls_definition['STATE_ENCRYPTED'] = OTR.CONST.MSGSTATE_ENCRYPTED;
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80 $cls_definition['STATE_FINISHED'] = OTR.CONST.MSGSTATE_FINISHED;
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81 $cls_definition['OTR_TAG'] = OTR.CONST.OTR_TAG;
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82 $cls_definition['OTR_VERSION_2'] = OTR.CONST.OTR_VERSION_2;
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83 $cls_definition['OTR_VERSION_3'] = OTR.CONST.OTR_VERSION_3;
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84 $cls_definition['WHITESPACE_TAG'] = OTR.CONST.WHITESPACE_TAG;
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85 $cls_definition['WHITESPACE_TAG_V2'] = OTR.CONST.WHITESPACE_TAG_V2;
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86 $cls_definition['WHITESPACE_TAG_V3'] = OTR.CONST.WHITESPACE_TAG_V3;
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87 """)
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88
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89 class UnencryptedMessage(Exception):
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90 pass
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91
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92 class Context(object):
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93
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94 def __init__(self, account, peername):
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95 self.user = account
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96 self.peer = peername
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97 self.trustName = self.peer
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98 options = {'fragment_size': 140,
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99 'send_interval': 200,
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100 'priv': account.getPrivkey(), # this would generate the account key if it hasn't been done yet
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101 'debug': False,
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102 }
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103 JS("""self.otr = new OTR(options);""")
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104
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105 for policy in ('ALLOW_V2', 'ALLOW_V3', 'REQUIRE_ENCRYPTION'):
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106 setattr(self.otr, policy, self.getPolicy(policy))
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107
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108 self.otr.on('ui', self.receiveMessageCb)
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109 self.otr.on('io', self.sendMessageCb)
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110 self.otr.on('error', self.messageErrorCb)
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111 self.otr.on('status', lambda status: self.setStateCb(self.otr.msgstate, status))
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112 self.otr.on('smp', self.smpAuthCb)
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113
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114 @property
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115 def state(self):
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116 return self.otr.msgstate
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117
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118 @state.setter
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119 def state(self, state):
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120 self.otr.msgstate = state
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121
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122 def getCurrentKey(self):
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123 return self.otr.their_priv_pk
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124
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125 def setTrust(self, fingerprint, trustLevel):
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126 self.user.setTrust(self.trustName, fingerprint, trustLevel)
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127
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128 def setCurrentTrust(self, trustLevel):
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129 self.setTrust(self.otr.their_priv_pk.fingerprint(), trustLevel)
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130
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131 def getTrust(self, fingerprint, default=None):
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132 return self.user.getTrust(self.trustName, fingerprint, default)
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133
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134 def getCurrentTrust(self):
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135 # XXX: the docstring of potr for the return value of this method is incorrect
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136 if self.otr.their_priv_pk is None:
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137 return None
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138 return self.getTrust(self.otr.their_priv_pk.fingerprint(), None)
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139
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140 def getUsedVersion(self):
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141 """Return the otr version that is beeing used"""
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142 # this method doesn't exist in potr, it has been added for convenience
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143 try:
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144 return self.otr.ake.otr_version
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145 except AttributeError:
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146 return None
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147
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148 def disconnect(self):
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149 self.otr.endOtr()
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150
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151 def finish(self):
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152 """Finish the session - avoid to send any message and the user has to manually disconnect"""
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153 # it means TLV of type 1 (two first bytes), message length 0 (2 last bytes)
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154 self.otr.handleTLVs('\x00\x01\x00\x00')
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155
522
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156 def receiveMessage(self, msg):
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157 """Received a message, ask otr.js to (try to) decrypt it"""
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158 self.otr.receiveMsg(msg)
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159
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160 def sendMessage(self, msg):
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161 """Ask otr.js to encrypt a message for sending"""
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162 self.otr.sendMsg(msg)
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163
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164 def sendQueryMessage(self):
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165 """Start or refresh an encryption communication"""
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166 # otr.js offers this method, with potr you have to build the query message yourself
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167 self.otr.sendQueryMsg()
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168
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169 def inject(self, msg, appdata=None):
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170 return self.sendMessageCb(msg, appdata)
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171
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172 def getPolicy(self, key):
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173 raise NotImplementedError
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174
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175 def smpAuthSecret(self, secret, question=None):
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176 return self.otr.smpSecret(secret, question)
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177
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178 def smpAuthAbort(self, act=None):
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179 # XXX: dirty hack to let the triggered method know who aborted the
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180 # authentication. We need it to display the proper feedback and,
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181 # if the correspondent aborted, set the conversation 'unverified'.
522
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182 self.otr.sm.init()
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183 JS("""self.otr.sm.sendMsg(OTR.HLP.packTLV(6, ''))""")
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184 self.smpAuthCb('abort', '', act)
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185
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186 def sendMessageCb(self, msg, meta):
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187 """Actually send the message after it's been encrypted"""
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188 raise NotImplementedError
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189
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190 def receiveMessageCb(self, msg, encrypted):
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191 """Display the message after it's been eventually decrypted"""
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192 raise NotImplementedError
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193
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194 def messageErrorCb(self, error):
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195 """Message error callback"""
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196 raise NotImplementedError
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197
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198 def setStateCb(self, newstate):
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199 raise NotImplementedError
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200
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201 def smpAuthCb(self, newstate):
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202 raise NotImplementedError
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203
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204 class Account(object):
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205
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206 def __init__(self, host):
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207 self.host = host
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208 self.privkey = None
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209 self.trusts = {}
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210
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211 def getPrivkey(self):
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212 # the return value must have a method serializePrivateKey()
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213 # if the key is not saved yet, call savePrivkey to generate it
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214 if self.privkey is None:
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215 self.privkey = self.loadPrivkey()
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216 if self.privkey is None:
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217 JS("""self.privkey = new DSA();""")
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218 self.savePrivkey()
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219 return self.privkey
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220
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221 def setTrust(self, key, fingerprint, trustLevel):
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222 if key not in self.trusts:
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223 self.trusts[key] = {}
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224 self.trusts[key][fingerprint] = trustLevel
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225 self.saveTrusts()
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226
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227 def getTrust(self, key, fingerprint, default=None):
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228 if key not in self.trusts:
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229 return default
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230 return self.trusts[key].get(fingerprint, default)
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231
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232 def loadPrivkey(self):
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233 raise NotImplementedError
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234
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235 def savePrivkey(self):
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236 raise NotImplementedError
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237
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238 def saveTrusts(self):
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239 raise NotImplementedError
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240
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241
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242 class crypt(object):
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243
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244 class PK(object):
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245
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246 def parsePrivateKey(self, key):
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247 JS("""return DSA.parsePrivate(key);""")
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248
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249
537
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250 class proto(object):
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251
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252 @classmethod
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253 def checkForOTR(cls, body):
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254 """Helper method to check if the message contains OTR starting tag or whitespace
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255
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256 @return:
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257 - context.OTR_TAG if the message starts with it
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258 - context.WHITESPACE_TAG if the message contains OTR whitespaces
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259 - None otherwise
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260 """
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261 if body.startswith(context.OTR_TAG):
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262 return context.OTR_TAG
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263 index = body.find(context.WHITESPACE_TAG)
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264 if index < 0:
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265 return False
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266 tags = [body[i:i + 8] for i in range(index, len(body), 8)]
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267 if [True for tag in tags if tag in (context.WHITESPACE_TAG_V2, context.WHITESPACE_TAG_V3)]:
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268 return context.WHITESPACE_TAG
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269 return None
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270
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271
522
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272 # serialazePrivateKey is the method name in potr
0de69fec24e9 browser and server sides: OTR plugin, first draft
souliane <souliane@mailoo.org>
parents:
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273 JS("""DSA.serializePrivateKey = DSA.packPrivate;""")