Mercurial > libervia-pubsub

annotate sat_pubsub/privilege.py @ 321:c7fe09894952

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privilege: better handling of main message 'to' attribute (i.e. privileged entity's server)
author Goffi <goffi@goffi.org>
date Tue, 05 Jan 2016 22:16:37 +0100
parents 5d7c3787672e
children 6d059f07c2d3
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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 # Copyright (c) 2015 Jérôme Poisson
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5
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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 # ---
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21
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22 # This module implements XEP-0356 (Privileged Entity) to manage rosters, messages and presences
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23
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24 from wokkel import xmppim
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25 from wokkel.compat import IQ
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26 from wokkel import pubsub
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27 from wokkel.iwokkel import IPubSubService
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28 from wokkel.subprotocols import XMPPHandler
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29 from twisted.python import log
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30 from twisted.python import failure
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31 from twisted.words.xish import domish
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32 from twisted.words.protocols.jabber import jid
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33
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34 FORWARDED_NS = 'urn:xmpp:forward:0'
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35 PRIV_ENT_NS = 'urn:xmpp:privilege:1'
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36 PRIV_ENT_ADV_XPATH = '/message/privilege[@xmlns="{}"]'.format(PRIV_ENT_NS)
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37 ROSTER_NS = 'jabber:iq:roster'
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38 PERM_ROSTER = 'roster'
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39 PERM_MESSAGE = 'message'
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40 PERM_PRESENCE = 'presence'
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41 ALLOWED_ROSTER = ('none', 'get', 'set', 'both')
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42 ALLOWED_MESSAGE = ('none', 'outgoing')
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43 ALLOWED_PRESENCE = ('none', 'managed_entity', 'roster')
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44 TO_CHECK = {PERM_ROSTER:ALLOWED_ROSTER, PERM_MESSAGE:ALLOWED_MESSAGE, PERM_PRESENCE:ALLOWED_PRESENCE}
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46
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47 class InvalidStanza(Exception):
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48 pass
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49
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50 class NotAllowedError(Exception):
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51 pass
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52
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53 class PrivilegesHandler(XMPPHandler):
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54 #FIXME: need to manage updates, and database sync
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55 #TODO: cache
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56
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57 def __init__(self, service_jid):
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58 super(PrivilegesHandler, self).__init__()
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59 self._permissions = {PERM_ROSTER: 'none',
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60 PERM_MESSAGE: 'none',
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61 PERM_PRESENCE: 'none'}
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62 self._pubsub_service = None
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63 # FIXME: we use a hack supposing that our privilege come from hostname
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64 # and we are a component named [name].hostname
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65 # but we need to manage properly server
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66 # TODO: do proper server handling
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67 self.server_jid = jid.JID(service_jid.host.split('.', 1)[1])
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68
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69 @property
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70 def permissions(self):
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71 return self._permissions
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72
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73 def connectionInitialized(self):
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74 for handler in self.parent.handlers:
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75 if IPubSubService.providedBy(handler):
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76 self._pubsub_service = handler
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77 break
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78 self.xmlstream.addObserver(PRIV_ENT_ADV_XPATH, self.onAdvertise)
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79
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80 def onAdvertise(self, message):
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81 """Managage the <message/> advertising privileges
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82
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83 self._permissions will be updated according to advertised privileged
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84 """
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85 privilege_elt = message.elements(PRIV_ENT_NS, 'privilege').next()
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86 for perm_elt in privilege_elt.elements(PRIV_ENT_NS):
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87 try:
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88 if perm_elt.name != 'perm':
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89 raise InvalidStanza(u'unexpected element {}'.format(perm_elt.name))
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90 perm_access = perm_elt['access']
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91 perm_type = perm_elt['type']
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92 try:
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93 if perm_type not in TO_CHECK[perm_access]:
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94 raise InvalidStanza(u'bad type [{}] for permission {}'.format(perm_type, perm_access))
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95 except KeyError:
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96 raise InvalidStanza(u'bad permission [{}]'.format(perm_access))
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97 except InvalidStanza as e:
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98 log.msg("Invalid stanza received ({}), setting permission to none".format(e))
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99 for perm in self._permissions:
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100 self._permissions[perm] = 'none'
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101 break
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102
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103 self._permissions[perm_access] = perm_type or 'none'
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104
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105 log.msg('Privileges updated: roster={roster}, message={message}, presence={presence}'.format(**self._permissions))
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106
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107 ## roster ##
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108
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109 def getRoster(self, to_jid):
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110 """
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111 Retrieve contact list.
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112
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113 @return: Roster as a mapping from L{JID} to L{RosterItem}.
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114 @rtype: L{twisted.internet.defer.Deferred}
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115 """
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116 if self._permissions[PERM_ROSTER] not in ('get', 'both'):
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117 log.msg("WARNING: permission not allowed to get roster")
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118 raise failure.Failure(NotAllowedError('roster get is not allowed'))
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119
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120 def processRoster(result):
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121 roster = {}
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122 for element in result.elements(ROSTER_NS, 'item'):
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123 item = xmppim.RosterItem.fromElement(element)
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124 roster[item.entity] = item
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125
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126 return roster
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127
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128 iq = IQ(self.xmlstream, 'get')
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129 iq.addElement((ROSTER_NS, 'query'))
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130 iq["to"] = to_jid.userhost()
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131 d = iq.send()
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132 d.addCallback(processRoster)
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133 return d
293
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134
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135 ## message ##
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136
321
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137 def sendMessage(self, priv_message, to_jid=None):
293
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138 """ Send privileged message (in the name of the server)
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139
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140 @param priv_message(domish.Element): privileged message
321
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141 @param to_jid(jid.JID, None): main message destinee
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142 None to use our own server
293
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143 """
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144 if self._permissions[PERM_MESSAGE] not in ('outgoing',):
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145 log.msg("WARNING: permission not allowed to send privileged messages")
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146 raise failure.Failure(NotAllowedError('privileged messages are not allowed'))
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147
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148 main_message = domish.Element((None, "message"))
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149 if to_jid is None:
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150 to_jid = self.server_jid
293
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151 main_message['to'] = to_jid.full()
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152 privilege_elt = main_message.addElement((PRIV_ENT_NS, 'privilege'))
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153 forwarded_elt = privilege_elt.addElement((FORWARDED_NS, 'forwarded'))
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154 priv_message['xmlns'] = 'jabber:client'
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155 forwarded_elt.addChild(priv_message)
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156 self.send(main_message)
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157
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158 def notifyPublish(self, pep_jid, nodeIdentifier, notifications):
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159 """Do notifications using privileges"""
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160 for subscriber, subscriptions, items in notifications:
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161 message = self._pubsub_service._createNotification('items', pep_jid,
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162 nodeIdentifier, subscriber,
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163 subscriptions)
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164 for item in items:
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165 item.uri = pubsub.NS_PUBSUB_EVENT
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166 message.event.items.addChild(item)
321
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167 self.sendMessage(message)
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168
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169
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170 def notifyRetract(self, pep_jid, nodeIdentifier, notifications):
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171 for subscriber, subscriptions, items in notifications:
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172 message = self._pubsub_service._createNotification('items', pep_jid,
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173 nodeIdentifier, subscriber,
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174 subscriptions)
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175 for item in items:
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176 retract = domish.Element((None, "retract"))
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177 retract['id'] = item['id']
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178 message.event.items.addChild(retract)
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179 self.sendMessage(message)
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180
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181
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182 # def notifyDelete(self, service, nodeIdentifier, subscribers,
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183 # redirectURI=None):
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184 # # TODO
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185 # for subscriber in subscribers:
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186 # message = self._createNotification('delete', service,
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187 # nodeIdentifier,
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188 # subscriber)
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189 # if redirectURI:
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190 # redirect = message.event.delete.addElement('redirect')
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191 # redirect['uri'] = redirectURI
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192 # self.send(message)