Mercurial > libervia-pubsub
annotate sat_pubsub/privilege.py @ 444:853432aa8002
install (requirements): launch the setup script at the end of requirements
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 21 Mar 2021 14:36:40 +0100 |
| parents | 96342e7e9f5d |
| children | 0b5233981671 |
| rev | line source |
|---|---|
| 414 | 1 #!/usr/bin/env python3 |
| 242 | 2 #-*- coding: utf-8 -*- |
| 3 # | |
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4 # Copyright (c) 2015 Jérôme Poisson |
| 242 | 5 |
| 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. |
| 242 | 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. |
| 242 | 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/>. |
| 242 | 19 |
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20 # --- |
| 242 | 21 |
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22 # This module implements XEP-0356 (Privileged Entity) to manage rosters, messages and presences |
| 242 | 23 |
| 24 from wokkel import xmppim | |
| 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 |
| 242 | 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} |
| 242 | 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(disco.DiscoClientProtocol): |
| 242 | 56 #FIXME: need to manage updates, and database sync |
| 57 #TODO: cache | |
| 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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89 |
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90 def onAdvertise(self, message): |
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91 """Managage the <message/> advertising privileges |
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92 |
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93 self._permissions will be updated according to advertised privileged |
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94 """ |
| 414 | 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': |
| 414 | 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]: |
| 414 | 104 raise InvalidStanza('bad type [{}] for permission {}'.format(perm_type, perm_access)) |
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105 except KeyError: |
| 414 | 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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112 |
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113 self._permissions[perm_access] = perm_type or 'none' |
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114 |
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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 |
| 242 | 119 def getRoster(self, to_jid): |
| 120 """ | |
| 121 Retrieve contact list. | |
| 122 | |
| 123 @return: Roster as a mapping from L{JID} to L{RosterItem}. | |
| 124 @rtype: L{twisted.internet.defer.Deferred} | |
| 125 """ | |
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126 # TODO: cache results |
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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 | 130 |
| 131 def processRoster(result): | |
| 132 roster = {} | |
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133 for element in result.query.elements(ROSTER_NS, 'item'): |
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134 item = xmppim.RosterItem.fromElement(element) |
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135 roster[item.entity] = item |
| 242 | 136 |
| 137 return roster | |
| 138 | |
| 139 iq = IQ(self.xmlstream, 'get') | |
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140 iq.addElement((ROSTER_NS, 'query')) |
| 242 | 141 iq["to"] = to_jid.userhost() |
| 142 d = iq.send() | |
| 143 d.addCallback(processRoster) | |
| 144 return d | |
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145 |
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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 |
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163 ## message ## |
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164 |
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165 def sendMessage(self, priv_message, to_jid=None): |
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166 """Send privileged message (in the name of the server) |
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167 |
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168 @param priv_message(domish.Element): privileged message |
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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 |
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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")) |
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177 if to_jid is None: |
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178 to_jid = self.server_jid |
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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('items', pep_jid, |
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190 nodeIdentifier, subscriber, |
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191 subscriptions) |
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192 for item in items: |
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193 item.uri = pubsub.NS_PUBSUB_EVENT |
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194 message.event.items.addChild(item) |
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195 self.sendMessage(message) |
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196 |
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197 |
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198 def notifyRetract(self, pep_jid, nodeIdentifier, notifications): |
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199 for subscriber, subscriptions, items in notifications: |
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200 message = self._pubsub_service._createNotification('items', pep_jid, |
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201 nodeIdentifier, subscriber, |
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202 subscriptions) |
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203 for item in items: |
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204 retract = domish.Element((None, "retract")) |
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205 retract['id'] = item['id'] |
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206 message.event.items.addChild(retract) |
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207 self.sendMessage(message) |
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208 |
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209 |
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210 # def notifyDelete(self, service, nodeIdentifier, subscribers, |
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211 # redirectURI=None): |
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212 # # TODO |
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213 # for subscriber in subscribers: |
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214 # message = self._createNotification('delete', service, |
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215 # nodeIdentifier, |
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216 # subscriber) |
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217 # if redirectURI: |
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218 # redirect = message.event.delete.addElement('redirect') |
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219 # redirect['uri'] = redirectURI |
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220 # self.send(message) |
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221 |
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222 |
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223 ## presence ## |
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224 |
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225 @defer.inlineCallbacks |
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226 def onPresence(self, presence_elt): |
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227 if self.server is None: |
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228 # FIXME: we use a hack supposing that our delegation come from hostname |
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229 # and we are a component named [name].hostname |
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230 # but we need to manage properly allowed servers |
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231 # TODO: do proper origin security check |
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232 _, self.server = presence_elt['to'].split('.', 1) |
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233 from_jid = jid.JID(presence_elt['from']) |
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234 from_jid_bare = from_jid.userhostJID() |
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235 if from_jid.host == self.server and from_jid_bare not in self.roster_cache: |
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236 roster = yield self.getRoster(from_jid_bare) |
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237 timestamp = time.time() |
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238 self.roster_cache[from_jid_bare] = {'timestamp': timestamp, |
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239 'roster': roster, |
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240 } |
| 414 | 241 for roster_jid, roster_item in roster.items(): |
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242 if roster_item.subscriptionFrom: |
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243 self.presence_map.setdefault(roster_jid, set()).add(from_jid_bare) |
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244 |
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245 presence_type = presence_elt.getAttribute('type') |
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246 if presence_type != "unavailable": |
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247 # new resource available, we check entity capabilities |
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248 try: |
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249 c_elt = next(presence_elt.elements('http://jabber.org/protocol/caps', 'c')) |
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250 hash_ = c_elt['hash'] |
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251 ver = c_elt['ver'] |
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252 except (StopIteration, KeyError): |
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253 # no capabilities, we don't go further |
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254 return |
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255 |
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256 # FIXME: hash is not checked (cf. XEP-0115) |
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257 disco_tuple = (hash_, ver) |
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258 |
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259 if disco_tuple not in self.hash_map: |
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260 # first time we se this hash, what is behind it? |
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261 try: |
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262 infos = yield self.requestInfo(from_jid) |
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263 except error.StanzaError as e: |
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264 log.msg( |
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265 f"WARNING: can't request disco info for {from_jid!r} (presence: " |
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266 f"{presence_type}): {e}" |
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267 ) |
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268 else: |
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269 self.hash_map[disco_tuple] = { |
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270 'notify': { |
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271 f[:-7] for f in infos.features if f.endswith('+notify') |
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272 }, |
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273 'infos': infos |
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274 } |
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275 |
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276 # jid_caps must be filled only after hash_map is set, to be sure that |
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277 # the hash data is available in getAutoSubscribers |
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278 jid_caps = self.caps_map.setdefault(from_jid_bare, {}) |
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279 if from_jid.resource not in jid_caps: |
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280 jid_caps[from_jid.resource] = disco_tuple |
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281 |
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282 # nodes are the nodes subscribed with +notify |
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283 nodes = tuple(self.hash_map[disco_tuple]['notify']) |
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284 if not nodes: |
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285 return |
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286 # publishers are entities which have granted presence access to our user + user itself |
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287 publishers = tuple(self.presence_map.get(from_jid_bare, ())) + (from_jid_bare,) |
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288 |
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289 # FIXME: add "presence" access_model (for node) for getLastItems |
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290 last_items = yield self._backend.storage.getLastItems(publishers, nodes, ('open',), ('open',), True) |
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291 # we send message with last item, as required by https://xmpp.org/extensions/xep-0163.html#notify-last |
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292 for pep_jid, node, item, item_access_model in last_items: |
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293 self.notifyPublish(pep_jid, node, [(from_jid, None, [item])]) |
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294 |
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295 ## misc ## |
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296 |
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297 @defer.inlineCallbacks |
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298 def getAutoSubscribers(self, recipient, nodeIdentifier, explicit_subscribers): |
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299 """get automatic subscribers, i.e. subscribers with presence subscription and +notify for this node |
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300 |
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301 @param recipient(jid.JID): jid of the PEP owner of this node |
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302 @param nodeIdentifier(unicode): node |
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303 @param explicit_subscribers(set(jid.JID}: jids of people which have an explicit subscription |
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304 @return (list[jid.JID]): full jid of automatically subscribed entities |
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305 """ |
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306 auto_subscribers = [] |
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307 roster = yield self.getRoster(recipient) |
| 414 | 308 for roster_jid, roster_item in roster.items(): |
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309 if roster_jid in explicit_subscribers: |
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310 continue |
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311 if roster_item.subscriptionFrom: |
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312 try: |
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313 online_resources = self.caps_map[roster_jid] |
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314 except KeyError: |
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315 continue |
| 414 | 316 for res, disco_tuple in online_resources.items(): |
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317 notify = self.hash_map[disco_tuple]['notify'] |
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318 if nodeIdentifier in notify: |
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319 full_jid = jid.JID(tuple=(roster_jid.user, roster_jid.host, res)) |
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320 auto_subscribers.append(full_jid) |
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321 defer.returnValue(auto_subscribers) |