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annotate src/plugins/plugin_xep_0115.py @ 945:899dc9cd0f35

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plugin XEP-0092: feature check before requesting version
author Goffi <goffi@goffi.org>
date Fri, 28 Mar 2014 18:19:29 +0100
parents e1842ebcb2f3
children 4a577b170809
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rev   line source
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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 # SAT plugin for managing xep-0115
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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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 from sat.core.i18n import _
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21 from sat.core.constants import Const as C
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22 from logging import debug, info, error, warning
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23 from twisted.words.xish import domish
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24 from twisted.words.protocols.jabber import jid
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25 from twisted.internet import defer
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26 from zope.interface import implements
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27 from wokkel import disco, iwokkel
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29 try:
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30 from twisted.words.protocols.xmlstream import XMPPHandler
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31 except ImportError:
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32 from wokkel.subprotocols import XMPPHandler
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33
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34 PRESENCE = '/presence'
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35 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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36 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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37
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38 PLUGIN_INFO = {
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39 "name": "XEP 0115 Plugin",
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40 "import_name": "XEP-0115",
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41 "type": "XEP",
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42 "protocols": ["XEP-0115"],
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43 "dependencies": [],
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44 "main": "XEP_0115",
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45 "handler": "yes",
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46 "description": _("""Implementation of entity capabilities""")
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47 }
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49
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50 class XEP_0115(object):
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51 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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52
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53 def __init__(self, host):
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54 info(_("Plugin XEP_0115 initialization"))
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55 self.host = host
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56 host.trigger.add("Disco handled", self._checkHash)
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57 host.trigger.add("Presence send", self._presenceTrigger)
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58
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59 def getHandler(self, profile):
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60 return XEP_0115_handler(self, profile)
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61
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62 def _checkHash(self, disco_d, profile):
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63 if XEP_0115.cap_hash is None:
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64 disco_d.addCallback(lambda dummy: self.recalculateHash(profile))
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65 return True
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66
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67 def _presenceTrigger(self, obj):
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68 if XEP_0115.cap_hash is not None:
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69 obj.addChild(XEP_0115.c_elt)
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70 return True
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71
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72 @defer.inlineCallbacks
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73 def recalculateHash(self, profile):
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74 client = self.host.getClient(profile)
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75 disco_infos = yield client.discoHandler.info(client.jid, client.jid, '')
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76 cap_hash = self.host.memory.disco.generateHash(disco_infos)
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77 info("Our capability hash has been generated: [%s]" % cap_hash)
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78 debug("Generating capability domish.Element")
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79 c_elt = domish.Element((NS_ENTITY_CAPABILITY, 'c'))
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80 c_elt['hash'] = 'sha-1'
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81 c_elt['node'] = C.APP_URL
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82 c_elt['ver'] = cap_hash
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83 XEP_0115.cap_hash = cap_hash
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84 XEP_0115.c_elt = c_elt
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85 if cap_hash not in self.host.memory.disco.hashes:
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86 self.host.memory.disco.hashes[cap_hash] = disco_infos
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87 self.host.memory.updateEntityData(client.jid, C.ENTITY_CAP_HASH, cap_hash, profile)
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88
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89
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90 class XEP_0115_handler(XMPPHandler):
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91 implements(iwokkel.IDisco)
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92
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93 def __init__(self, plugin_parent, profile):
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94 self.plugin_parent = plugin_parent
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95 self.host = plugin_parent.host
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96 self.profile = profile
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97
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98 def connectionInitialized(self):
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99 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
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100
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101 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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102 return [disco.DiscoFeature(NS_ENTITY_CAPABILITY)]
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103
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104 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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105 return []
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106
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107 @defer.inlineCallbacks
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108 def update(self, presence):
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109 """
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110 Manage the capabilities of the entity
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111
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112 Check if we know the version of this capatilities and get the capibilities if necessary
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113 """
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114 from_jid = jid.JID(presence['from'])
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115 c_elem = presence.elements(NS_ENTITY_CAPABILITY, 'c').next()
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116 try:
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117 c_ver = c_elem['ver']
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118 c_hash = c_elem['hash']
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119 c_node = c_elem['node']
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120 except KeyError:
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121 warning(_('Received invalid capabilities tag'))
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122 return
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123
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124 if c_ver in self.host.memory.disco.hashes:
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125 # we already know the hash, we update the jid entity
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126 debug ("hash [%s] already in cache, updating entity" % c_ver)
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127 self.host.memory.updateEntityData(from_jid, C.ENTITY_CAP_HASH, c_ver, self.profile)
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128 return
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129
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130 yield self.host.getDiscoInfos(from_jid, self.profile)
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
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131 if c_hash != 'sha-1':
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
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132 #unknown hash method
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
133 warning(_('Unknown hash method for entity capabilities: [%(hash_method)s] (entity: %(jid)s, node: %(node)s)') % {'hash_method':c_hash, 'jid': from_jid, 'node': c_node})
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
134 computed_hash = self.host.memory.getEntityDatum(from_jid, C.ENTITY_CAP_HASH, self.profile)
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
135 if computed_hash != c_ver:
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
136 warning(_('Computed hash differ from given hash:\ngiven: [%(given_hash)s]\ncomputed: [%(computed_hash)s]\n(entity: %(jid)s, node: %(node)s)') % {'given_hash':c_ver, 'computed_hash': computed_hash, 'jid': from_jid, 'node': c_node})
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
137
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
138 # TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3