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annotate src/plugins/plugin_xep_0115.py @ 2504:67cc54b01a12

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plugin file sharing component: first draft: this component act as an endpoint where a user can store and retrieve its files using Jingle.
author Goffi <goffi@goffi.org>
date Wed, 28 Feb 2018 18:28:39 +0100
parents 0046283a285d
children 8d82a62fa098
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1 #!/usr/bin/env python2
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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) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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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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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 sat.core.log import getLogger
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23 log = getLogger(__name__)
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24 from twisted.words.xish import domish
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25 from twisted.words.protocols.jabber import jid
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26 from twisted.internet import defer, error
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27 from zope.interface import implements
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28 from wokkel import disco, iwokkel
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29
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30 try:
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31 from twisted.words.protocols.xmlstream import XMPPHandler
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32 except ImportError:
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33 from wokkel.subprotocols import XMPPHandler
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34
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35 PRESENCE = '/presence'
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36 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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37 NS_CAPS_OPTIMIZE = 'http://jabber.org/protocol/caps#optimize'
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38 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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39
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40 PLUGIN_INFO = {
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41 C.PI_NAME: "XEP 0115 Plugin",
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42 C.PI_IMPORT_NAME: "XEP-0115",
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43 C.PI_TYPE: "XEP",
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44 C.PI_MODES: C.PLUG_MODE_BOTH,
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45 C.PI_PROTOCOLS: ["XEP-0115"],
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46 C.PI_DEPENDENCIES: [],
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47 C.PI_MAIN: "XEP_0115",
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48 C.PI_HANDLER: "yes",
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49 C.PI_DESCRIPTION: _("""Implementation of entity capabilities""")
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50 }
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52
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53 class XEP_0115(object):
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54 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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55
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56 def __init__(self, host):
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57 log.info(_("Plugin XEP_0115 initialization"))
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58 self.host = host
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59 host.trigger.add("Disco handled", self._checkHash)
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60 host.trigger.add("Presence send", self._presenceTrigger)
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61
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62 def getHandler(self, client):
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63 return XEP_0115_handler(self, client.profile)
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64
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65 def _checkHash(self, disco_d, profile):
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66 client = self.host.getClient(profile)
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67 client.caps_optimize = None
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68
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69 if XEP_0115.cap_hash is None:
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70 disco_d.addCallback(lambda dummy: self.host.hasFeature(client, NS_CAPS_OPTIMIZE))
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71 def updateOptimize(optimize):
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72 client.caps_optimize = optimize
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73 if optimize:
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74 log.info(_("Caps optimisation enabled"))
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75 client.caps_sent = False
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76 else:
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77 log.warning(_("Caps optimisation not available"))
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78 disco_d.addCallback(updateOptimize)
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79 disco_d.addCallback(lambda dummy: self.recalculateHash(profile))
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80 return True
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81
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82 def _presenceTrigger(self, client, obj):
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83 if XEP_0115.cap_hash is not None:
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84 if client.caps_optimize:
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85 if client.caps_sent:
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86 return True
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87 client.caps_sent = True
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88 obj.addChild(XEP_0115.c_elt)
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89 return True
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90
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91 @defer.inlineCallbacks
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92 def recalculateHash(self, profile):
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93 client = self.host.getClient(profile)
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94 _infos = yield client.discoHandler.info(client.jid, client.jid, '')
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95 disco_infos = disco.DiscoInfo()
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96 for item in _infos:
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97 disco_infos.append(item)
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98 cap_hash = self.host.memory.disco.generateHash(disco_infos)
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99 log.info("Our capability hash has been generated: [%s]" % cap_hash)
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100 log.debug("Generating capability domish.Element")
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101 c_elt = domish.Element((NS_ENTITY_CAPABILITY, 'c'))
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102 c_elt['hash'] = 'sha-1'
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103 c_elt['node'] = C.APP_URL
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104 c_elt['ver'] = cap_hash
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105 XEP_0115.cap_hash = cap_hash
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106 XEP_0115.c_elt = c_elt
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107 if client.caps_optimize:
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108 client.caps_sent = False
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109 if cap_hash not in self.host.memory.disco.hashes:
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110 self.host.memory.disco.hashes[cap_hash] = disco_infos
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111 self.host.memory.updateEntityData(client.jid, C.ENTITY_CAP_HASH, cap_hash, profile_key=profile)
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112
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113
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114 class XEP_0115_handler(XMPPHandler):
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115 implements(iwokkel.IDisco)
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116
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117 def __init__(self, plugin_parent, profile):
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118 self.plugin_parent = plugin_parent
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119 self.host = plugin_parent.host
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120 self.profile = profile
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121
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122 def connectionInitialized(self):
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123 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
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124
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125 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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126 return [disco.DiscoFeature(NS_ENTITY_CAPABILITY), disco.DiscoFeature(NS_CAPS_OPTIMIZE)]
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128 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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129 return []
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130
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Goffi <goffi@goffi.org>
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131 def update(self, presence):
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132 """
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Goffi <goffi@goffi.org>
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133 Manage the capabilities of the entity
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134
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souliane <souliane@mailoo.org>
parents: 1232
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135 Check if we know the version of this capabilities and get the capabilities if necessary
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136 """
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Goffi <goffi@goffi.org>
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137 from_jid = jid.JID(presence['from'])
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parents: 941
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138 c_elem = presence.elements(NS_ENTITY_CAPABILITY, 'c').next()
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139 try:
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Goffi <goffi@goffi.org>
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140 c_ver = c_elem['ver']
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Goffi <goffi@goffi.org>
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141 c_hash = c_elem['hash']
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142 c_node = c_elem['node']
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Goffi <goffi@goffi.org>
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143 except KeyError:
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souliane <souliane@mailoo.org>
parents: 1396
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144 log.warning(_(u'Received invalid capabilities tag: %s') % c_elem.toXml())
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145 return
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146
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Goffi <goffi@goffi.org>
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147 if c_ver in self.host.memory.disco.hashes:
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parents: 941
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148 # we already know the hash, we update the jid entity
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souliane <souliane@mailoo.org>
parents: 1396
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149 log.debug(u"hash [%(hash)s] already in cache, updating entity [%(jid)s]" % {'hash': c_ver, 'jid': from_jid.full()})
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Goffi <goffi@goffi.org>
parents: 1246
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150 self.host.memory.updateEntityData(from_jid, C.ENTITY_CAP_HASH, c_ver, profile_key=self.profile)
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151 return
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152
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souliane <souliane@mailoo.org>
parents: 1232
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153 if c_hash != 'sha-1': # unknown hash method
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souliane <souliane@mailoo.org>
parents: 1396
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154 log.warning(_(u'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})
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155
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souliane <souliane@mailoo.org>
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156 def cb(dummy):
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souliane <souliane@mailoo.org>
parents: 1232
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157 computed_hash = self.host.memory.getEntityDatum(from_jid, C.ENTITY_CAP_HASH, self.profile)
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souliane <souliane@mailoo.org>
parents: 1232
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158 if computed_hash != c_ver:
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souliane <souliane@mailoo.org>
parents: 1396
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159 log.warning(_(u'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})
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160
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souliane <souliane@mailoo.org>
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161 def eb(failure):
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souliane <souliane@mailoo.org>
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162 if isinstance(failure.value, error.ConnectionDone):
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souliane <souliane@mailoo.org>
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163 return
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souliane <souliane@mailoo.org>
parents: 1232
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164 msg = failure.value.condition if hasattr(failure.value, 'condition') else failure.getErrorMessage()
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souliane <souliane@mailoo.org>
parents: 1396
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165 log.error(_(u"Couldn't retrieve disco info for {jid}: {error}").format(jid=from_jid.full(), error=msg))
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souliane <souliane@mailoo.org>
parents: 1232
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166
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Goffi <goffi@goffi.org>
parents: 2145
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167 d = self.host.getDiscoInfos(self.parent, from_jid)
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parents: 1232
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168 d.addCallbacks(cb, eb)
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parents: 941
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169 # TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3