Mercurial > libervia-pubsub

annotate sat_pubsub/privilege.py @ 293:b96a4ac25f8b

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privilege: added methods to send privileged messages and notifications
author Goffi <goffi@goffi.org>
date Sun, 16 Aug 2015 01:15:13 +0200
parents 2f87fa282dfd
children 5d7c3787672e
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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 """
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5 Copyright (c) 2015 Jérôme Poisson
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6
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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 ---
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22
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23 This module implements XEP-0356 (Privileged Entity) to manage rosters, messages and presences
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24 """
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25
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26 from wokkel import xmppim
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27 from wokkel.compat import IQ
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28 from wokkel import pubsub
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29 from wokkel.iwokkel import IPubSubService
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30 from wokkel.subprotocols import XMPPHandler
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31 from twisted.python import log
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32 from twisted.python import failure
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33 from twisted.words.xish import domish
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34 from twisted.words.protocols.jabber import jid
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35
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36 FORWARDED_NS = 'urn:xmpp:forward:0'
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37 PRIV_ENT_NS = 'urn:xmpp:privilege:1'
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38 PRIV_ENT_ADV_XPATH = '/message/privilege[@xmlns="{}"]'.format(PRIV_ENT_NS)
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39 ROSTER_NS = 'jabber:iq:roster'
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40 PERM_ROSTER = 'roster'
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41 PERM_MESSAGE = 'message'
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42 PERM_PRESENCE = 'presence'
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43 ALLOWED_ROSTER = ('none', 'get', 'set', 'both')
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44 ALLOWED_MESSAGE = ('none', 'outgoing')
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45 ALLOWED_PRESENCE = ('none', 'managed_entity', 'roster')
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46 TO_CHECK = {PERM_ROSTER:ALLOWED_ROSTER, PERM_MESSAGE:ALLOWED_MESSAGE, PERM_PRESENCE:ALLOWED_PRESENCE}
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47
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48
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49 class InvalidStanza(Exception):
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50 pass
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51
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52 class NotAllowedError(Exception):
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53 pass
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54
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55 class PrivilegesHandler(XMPPHandler):
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56 #FIXME: need to manage updates, and database sync
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57 #TODO: cache
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58
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59 def __init__(self):
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60 super(PrivilegesHandler, self).__init__()
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61 self._permissions = {PERM_ROSTER: 'none',
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62 PERM_MESSAGE: 'none',
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63 PERM_PRESENCE: 'none'}
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64 self._pubsub_service = None
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65
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66 @property
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67 def permissions(self):
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68 return self._permissions
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69
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70 def connectionInitialized(self):
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71 for handler in self.parent.handlers:
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72 if IPubSubService.providedBy(handler):
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73 self._pubsub_service = handler
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74 break
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75 self.xmlstream.addObserver(PRIV_ENT_ADV_XPATH, self.onAdvertise)
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76
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77 def onAdvertise(self, message):
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78 """Managage the <message/> advertising privileges
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79
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80 self._permissions will be updated according to advertised privileged
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81 """
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82 privilege_elt = message.elements(PRIV_ENT_NS, 'privilege').next()
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83 for perm_elt in privilege_elt.elements(PRIV_ENT_NS):
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84 try:
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85 if perm_elt.name != 'perm':
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86 raise InvalidStanza(u'unexpected element {}'.format(perm_elt.name))
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87 perm_access = perm_elt['access']
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88 perm_type = perm_elt['type']
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89 try:
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90 if perm_type not in TO_CHECK[perm_access]:
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91 raise InvalidStanza(u'bad type [{}] for permission {}'.format(perm_type, perm_access))
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92 except KeyError:
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93 raise InvalidStanza(u'bad permission [{}]'.format(perm_access))
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94 except InvalidStanza as e:
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95 log.msg("Invalid stanza received ({}), setting permission to none".format(e))
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96 for perm in self._permissions:
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97 self._permissions[perm] = 'none'
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98 break
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99
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100 self._permissions[perm_access] = perm_type or 'none'
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101
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102 log.msg('Privileges updated: roster={roster}, message={message}, presence={presence}'.format(**self._permissions))
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103
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104 ## roster ##
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105
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106 def getRoster(self, to_jid):
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107 """
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108 Retrieve contact list.
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109
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110 @return: Roster as a mapping from L{JID} to L{RosterItem}.
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111 @rtype: L{twisted.internet.defer.Deferred}
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112 """
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113 if self._permissions[PERM_ROSTER] not in ('get', 'both'):
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114 log.msg("WARNING: permission not allowed to get roster")
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115 raise failure.Failure(NotAllowedError('roster get is not allowed'))
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116
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117 def processRoster(result):
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118 roster = {}
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119 for element in result.elements(ROSTER_NS, 'item'):
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120 item = xmppim.RosterItem.fromElement(element)
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121 roster[item.entity] = item
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122
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123 return roster
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124
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125 iq = IQ(self.xmlstream, 'get')
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126 iq.addElement((ROSTER_NS, 'query'))
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127 iq["to"] = to_jid.userhost()
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128 d = iq.send()
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129 d.addCallback(processRoster)
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130 return d
293
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131
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132 ## message ##
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133
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134 def sendMessage(self, to_jid, priv_message):
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135 """ Send privileged message (in the name of the server)
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136
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137 @param to_jid(jid.JID): main message destinee
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138 @param priv_message(domish.Element): privileged message
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139 """
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140 if self._permissions[PERM_MESSAGE] not in ('outgoing',):
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141 log.msg("WARNING: permission not allowed to send privileged messages")
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142 raise failure.Failure(NotAllowedError('privileged messages are not allowed'))
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143
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144 main_message = domish.Element((None, "message"))
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145 main_message['to'] = to_jid.full()
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146 privilege_elt = main_message.addElement((PRIV_ENT_NS, 'privilege'))
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147 forwarded_elt = privilege_elt.addElement((FORWARDED_NS, 'forwarded'))
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148 priv_message['xmlns'] = 'jabber:client'
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149 forwarded_elt.addChild(priv_message)
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150 self.send(main_message)
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151
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152 def notifyPublish(self, pep_jid, nodeIdentifier, notifications):
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153 """Do notifications using privileges"""
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154 for subscriber, subscriptions, items in notifications:
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155 message = self._pubsub_service._createNotification('items', pep_jid,
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156 nodeIdentifier, subscriber,
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157 subscriptions)
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158 for item in items:
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159 item.uri = pubsub.NS_PUBSUB_EVENT
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160 message.event.items.addChild(item)
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161 self.sendMessage(jid.JID(pep_jid.host), message)
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162
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163
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164 def notifyRetract(self, pep_jid, nodeIdentifier, notifications):
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165 for subscriber, subscriptions, items in notifications:
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166 message = self._pubsub_service._createNotification('items', pep_jid,
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167 nodeIdentifier, subscriber,
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168 subscriptions)
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169 for item in items:
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170 retract = domish.Element((None, "retract"))
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171 retract['id'] = item['id']
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172 message.event.items.addChild(retract)
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173 self.sendMessage(jid.JID(pep_jid.host), message)
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174
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175
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176 # def notifyDelete(self, service, nodeIdentifier, subscribers,
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177 # redirectURI=None):
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178 # # TODO
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179 # for subscriber in subscribers:
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180 # message = self._createNotification('delete', service,
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181 # nodeIdentifier,
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182 # subscriber)
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183 # if redirectURI:
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184 # redirect = message.event.delete.addElement('redirect')
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185 # redirect['uri'] = redirectURI
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186 # self.send(message)