Mercurial > libervia-pubsub

annotate sat_pubsub/privilege.py @ 455:0b5233981671

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backend: fix `delete` notification + add `purge` notification
author Goffi <goffi@goffi.org>
date Mon, 02 Aug 2021 21:58:17 +0200
parents 96342e7e9f5d
children 607616f9ef5b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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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 import disco
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28 from wokkel.iwokkel import IPubSubService
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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.internet import defer
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32 from twisted.words.xish import domish
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33 from twisted.words.protocols.jabber import jid, error
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34 import time
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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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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(disco.DiscoClientProtocol):
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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, service_jid):
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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 self._backend = None
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66 # FIXME: we use a hack supposing that our privilege come from hostname
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67 # and we are a component named [name].hostname
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68 # but we need to manage properly server
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69 # TODO: do proper server handling
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70 self.server_jid = jid.JID(service_jid.host.split('.', 1)[1])
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71 self.caps_map = {} # key: bare jid, value: dict of resources with caps hash
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72 self.hash_map = {} # key: (hash,version), value: dict with DiscoInfo instance (infos) and nodes to notify (notify)
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73 self.roster_cache = {} # key: jid, value: dict with "timestamp" and "roster"
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74 self.presence_map = {} # inverted roster: key: jid, value: set of entities who has this jid in roster (with presence of "from" or "both")
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75 self.server = None
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76
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77 @property
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78 def permissions(self):
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79 return self._permissions
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80
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81 def connectionInitialized(self):
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82 for handler in self.parent.handlers:
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83 if IPubSubService.providedBy(handler):
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84 self._pubsub_service = handler
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85 break
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86 self._backend = self.parent.parent.getServiceNamed('backend')
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87 self.xmlstream.addObserver(PRIV_ENT_ADV_XPATH, self.onAdvertise)
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88 self.xmlstream.addObserver('/presence', self.onPresence)
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90 def onAdvertise(self, message):
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91 """Managage the <message/> advertising privileges
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93 self._permissions will be updated according to advertised privileged
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94 """
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95 privilege_elt = next(message.elements(PRIV_ENT_NS, 'privilege'))
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96 for perm_elt in privilege_elt.elements(PRIV_ENT_NS):
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97 try:
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98 if perm_elt.name != 'perm':
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99 raise InvalidStanza('unexpected element {}'.format(perm_elt.name))
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100 perm_access = perm_elt['access']
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101 perm_type = perm_elt['type']
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102 try:
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103 if perm_type not in TO_CHECK[perm_access]:
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104 raise InvalidStanza('bad type [{}] for permission {}'.format(perm_type, perm_access))
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105 except KeyError:
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106 raise InvalidStanza('bad permission [{}]'.format(perm_access))
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107 except InvalidStanza as e:
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108 log.msg("Invalid stanza received ({}), setting permission to none".format(e))
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109 for perm in self._permissions:
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110 self._permissions[perm] = 'none'
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111 break
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113 self._permissions[perm_access] = perm_type or 'none'
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115 log.msg('Privileges updated: roster={roster}, message={message}, presence={presence}'.format(**self._permissions))
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116
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117 ## roster ##
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118
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119 def getRoster(self, to_jid):
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120 """
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121 Retrieve contact list.
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122
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123 @return: Roster as a mapping from L{JID} to L{RosterItem}.
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124 @rtype: L{twisted.internet.defer.Deferred}
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125 """
343
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126 # TODO: cache results
285
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127 if self._permissions[PERM_ROSTER] not in ('get', 'both'):
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128 log.msg("WARNING: permission not allowed to get roster")
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129 raise failure.Failure(NotAllowedError('roster get is not allowed'))
242
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130
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131 def processRoster(result):
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132 roster = {}
338
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133 for element in result.query.elements(ROSTER_NS, 'item'):
253
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134 item = xmppim.RosterItem.fromElement(element)
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135 roster[item.entity] = item
242
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136
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137 return roster
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138
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139 iq = IQ(self.xmlstream, 'get')
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140 iq.addElement((ROSTER_NS, 'query'))
242
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141 iq["to"] = to_jid.userhost()
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142 d = iq.send()
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143 d.addCallback(processRoster)
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144 return d
293
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145
348
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146 def _isSubscribedFrom(self, roster, entity, roster_owner_jid):
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147 try:
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148 return roster[entity.userhostJID()].subscriptionFrom
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149 except KeyError:
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150 return False
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151
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152 def isSubscribedFrom(self, entity, roster_owner_jid):
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153 """Check if entity has presence subscription from roster_owner_jid
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154
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155 @param entity(jid.JID): entity to check subscription to
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156 @param roster_owner_jid(jid.JID): owner of the roster to check
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157 @return D(bool): True if entity has a subscription from roster_owner_jid
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158 """
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159 d = self.getRoster(roster_owner_jid)
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160 d.addCallback(self._isSubscribedFrom, entity, roster_owner_jid)
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161 return d
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162
293
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163 ## message ##
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164
321
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165 def sendMessage(self, priv_message, to_jid=None):
348
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166 """Send privileged message (in the name of the server)
293
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167
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168 @param priv_message(domish.Element): privileged message
321
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169 @param to_jid(jid.JID, None): main message destinee
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170 None to use our own server
293
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171 """
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172 if self._permissions[PERM_MESSAGE] not in ('outgoing',):
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173 log.msg("WARNING: permission not allowed to send privileged messages")
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174 raise failure.Failure(NotAllowedError('privileged messages are not allowed'))
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175
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176 main_message = domish.Element((None, "message"))
321
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177 if to_jid is None:
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178 to_jid = self.server_jid
293
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179 main_message['to'] = to_jid.full()
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180 privilege_elt = main_message.addElement((PRIV_ENT_NS, 'privilege'))
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181 forwarded_elt = privilege_elt.addElement((FORWARDED_NS, 'forwarded'))
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182 priv_message['xmlns'] = 'jabber:client'
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183 forwarded_elt.addChild(priv_message)
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184 self.send(main_message)
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185
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186 def notifyPublish(self, pep_jid, nodeIdentifier, notifications):
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187 """Do notifications using privileges"""
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188 for subscriber, subscriptions, items in notifications:
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189 message = self._pubsub_service._createNotification(
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190 'items',
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191 pep_jid,
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192 nodeIdentifier,
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193 subscriber,
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194 subscriptions
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195 )
293
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196 for item in items:
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197 item.uri = pubsub.NS_PUBSUB_EVENT
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198 message.event.items.addChild(item)
321
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199 self.sendMessage(message)
293
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200
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201 def notifyRetract(self, pep_jid, nodeIdentifier, notifications):
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202 for subscriber, subscriptions, items in notifications:
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203 message = self._pubsub_service._createNotification(
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204 'items',
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205 pep_jid,
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206 nodeIdentifier,
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207 subscriber,
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208 subscriptions
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209 )
293
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210 for item in items:
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211 retract = domish.Element((None, "retract"))
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212 retract['id'] = item['id']
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213 message.event.items.addChild(retract)
321
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214 self.sendMessage(message)
293
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215
455
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216 def notifyDelete(self, pep_jid, nodeIdentifier, subscribers, redirectURI=None):
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217 for subscriber in subscribers:
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218 message = self._pubsub_service._createNotification(
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219 'delete',
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220 pep_jid,
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221 nodeIdentifier,
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222 subscriber
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diff changeset
223 )
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224 if redirectURI:
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225 redirect = message.event.delete.addElement('redirect')
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226 redirect['uri'] = redirectURI
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227 self.sendMessage(message)
293
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228
455
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229 def notifyPurge(self, pep_jid, nodeIdentifier, subscribers):
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230 for subscriber in subscribers:
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231 message = self._pubsub_service._createNotification(
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232 'purge',
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233 pep_jid,
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234 nodeIdentifier,
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235 subscriber
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diff changeset
236 )
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237 self.sendMessage(message)
338
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238
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239 ## presence ##
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240
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diff changeset
241 @defer.inlineCallbacks
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242 def onPresence(self, presence_elt):
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diff changeset
243 if self.server is None:
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diff changeset
244 # FIXME: we use a hack supposing that our delegation come from hostname
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245 # and we are a component named [name].hostname
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diff changeset
246 # but we need to manage properly allowed servers
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diff changeset
247 # TODO: do proper origin security check
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248 _, self.server = presence_elt['to'].split('.', 1)
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diff changeset
249 from_jid = jid.JID(presence_elt['from'])
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diff changeset
250 from_jid_bare = from_jid.userhostJID()
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diff changeset
251 if from_jid.host == self.server and from_jid_bare not in self.roster_cache:
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diff changeset
252 roster = yield self.getRoster(from_jid_bare)
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diff changeset
253 timestamp = time.time()
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diff changeset
254 self.roster_cache[from_jid_bare] = {'timestamp': timestamp,
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diff changeset
255 'roster': roster,
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diff changeset
256 }
414
ccb2a22ea0fc Python 3 port:
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diff changeset
257 for roster_jid, roster_item in roster.items():
338
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258 if roster_item.subscriptionFrom:
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259 self.presence_map.setdefault(roster_jid, set()).add(from_jid_bare)
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260
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261 presence_type = presence_elt.getAttribute('type')
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262 if presence_type != "unavailable":
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263 # new resource available, we check entity capabilities
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264 try:
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265 c_elt = next(presence_elt.elements('http://jabber.org/protocol/caps', 'c'))
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266 hash_ = c_elt['hash']
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267 ver = c_elt['ver']
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268 except (StopIteration, KeyError):
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269 # no capabilities, we don't go further
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270 return
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271
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272 # FIXME: hash is not checked (cf. XEP-0115)
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273 disco_tuple = (hash_, ver)
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274
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275 if disco_tuple not in self.hash_map:
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276 # first time we se this hash, what is behind it?
435
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277 try:
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278 infos = yield self.requestInfo(from_jid)
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279 except error.StanzaError as e:
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280 log.msg(
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281 f"WARNING: can't request disco info for {from_jid!r} (presence: "
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282 f"{presence_type}): {e}"
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283 )
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284 else:
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285 self.hash_map[disco_tuple] = {
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286 'notify': {
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287 f[:-7] for f in infos.features if f.endswith('+notify')
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288 },
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289 'infos': infos
338
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290 }
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291
400
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292 # jid_caps must be filled only after hash_map is set, to be sure that
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293 # the hash data is available in getAutoSubscribers
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294 jid_caps = self.caps_map.setdefault(from_jid_bare, {})
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295 if from_jid.resource not in jid_caps:
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296 jid_caps[from_jid.resource] = disco_tuple
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diff changeset
297
338
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298 # nodes are the nodes subscribed with +notify
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299 nodes = tuple(self.hash_map[disco_tuple]['notify'])
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diff changeset
300 if not nodes:
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301 return
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diff changeset
302 # publishers are entities which have granted presence access to our user + user itself
342
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parents: 338
diff changeset
303 publishers = tuple(self.presence_map.get(from_jid_bare, ())) + (from_jid_bare,)
338
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304
343
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diff changeset
305 # FIXME: add "presence" access_model (for node) for getLastItems
338
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diff changeset
306 last_items = yield self._backend.storage.getLastItems(publishers, nodes, ('open',), ('open',), True)
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diff changeset
307 # we send message with last item, as required by https://xmpp.org/extensions/xep-0163.html#notify-last
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diff changeset
308 for pep_jid, node, item, item_access_model in last_items:
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diff changeset
309 self.notifyPublish(pep_jid, node, [(from_jid, None, [item])])
343
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diff changeset
310
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311 ## misc ##
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312
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diff changeset
313 @defer.inlineCallbacks
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314 def getAutoSubscribers(self, recipient, nodeIdentifier, explicit_subscribers):
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diff changeset
315 """get automatic subscribers, i.e. subscribers with presence subscription and +notify for this node
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diff changeset
316
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diff changeset
317 @param recipient(jid.JID): jid of the PEP owner of this node
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diff changeset
318 @param nodeIdentifier(unicode): node
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diff changeset
319 @param explicit_subscribers(set(jid.JID}: jids of people which have an explicit subscription
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diff changeset
320 @return (list[jid.JID]): full jid of automatically subscribed entities
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diff changeset
321 """
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diff changeset
322 auto_subscribers = []
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diff changeset
323 roster = yield self.getRoster(recipient)
414
ccb2a22ea0fc Python 3 port:
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parents: 405
diff changeset
324 for roster_jid, roster_item in roster.items():
343
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diff changeset
325 if roster_jid in explicit_subscribers:
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diff changeset
326 continue
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diff changeset
327 if roster_item.subscriptionFrom:
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diff changeset
328 try:
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diff changeset
329 online_resources = self.caps_map[roster_jid]
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parents: 342
diff changeset
330 except KeyError:
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diff changeset
331 continue
414
ccb2a22ea0fc Python 3 port:
Goffi <goffi@goffi.org>
parents: 405
diff changeset
332 for res, disco_tuple in online_resources.items():
400
371e72871e19 privilege: fill hash_map before jid_caps to avoid KeyError in getAutoSubscribers
Goffi <goffi@goffi.org>
parents: 369
diff changeset
333 notify = self.hash_map[disco_tuple]['notify']
343
ff8aff4c9b79 backend, psql: implemented notifications for auto subscribers in PEP:
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parents: 342
diff changeset
334 if nodeIdentifier in notify:
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parents: 342
diff changeset
335 full_jid = jid.JID(tuple=(roster_jid.user, roster_jid.host, res))
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parents: 342
diff changeset
336 auto_subscribers.append(full_jid)
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parents: 342
diff changeset
337 defer.returnValue(auto_subscribers)