Mercurial > libervia-backend

annotate src/plugins/plugin_xep_0115.py @ 738:e867f146d49f

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author souliane <souliane@mailoo.org>
date Mon, 25 Nov 2013 12:29:14 +0100
parents a79a6843928c
children bfabeedbf32e
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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 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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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 logging import debug, info, error, warning
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21 from twisted.words.xish import domish
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22 from twisted.words.protocols.jabber import client, jid, xmlstream
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23 from twisted.words.protocols.jabber import error as jab_error
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24 from twisted.words.protocols.jabber.xmlstream import IQ
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25 from sat.memory.persistent import PersistentBinaryDict
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26 import os.path
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27 import types
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28
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29 from zope.interface import implements
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30
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31 from wokkel import disco, iwokkel
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32
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33 from hashlib import sha1
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34 from base64 import b64encode
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35
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36 try:
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37 from twisted.words.protocols.xmlstream import XMPPHandler
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38 except ImportError:
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39 from wokkel.subprotocols import XMPPHandler
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40
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41 PRESENCE = '/presence'
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42 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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43 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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44
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45 PLUGIN_INFO = {
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46 "name": "XEP 0115 Plugin",
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47 "import_name": "XEP-0115",
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48 "type": "XEP",
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49 "protocols": ["XEP-0115"],
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50 "dependencies": [],
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51 "main": "XEP_0115",
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52 "handler": "yes",
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53 "description": _("""Implementation of entity capabilities""")
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54 }
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56
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57 class HashGenerationError(Exception):
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58 pass
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59
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61 class ByteIdentity(object):
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62 """This class manage identity as bytes (needed for i;octet sort),
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63 it is used for the hash generation"""
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64
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65 def __init__(self, identity, lang=None):
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66 assert isinstance(identity, disco.DiscoIdentity)
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67 self.category = identity.category.encode('utf-8')
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68 self.idType = identity.type.encode('utf-8')
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69 self.name = identity.name.encode('utf-8') if identity.name else ''
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70 self.lang = lang.encode('utf-8') if lang else ''
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71
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72 def __str__(self):
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73 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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74
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75
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76 class XEP_0115(object):
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77 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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78 #TODO: this code is really dirty, need to clean it and try to move it to Wokkel
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79
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80 def __init__(self, host):
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81 info(_("Plugin XEP_0115 initialization"))
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82 self.host = host
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83 host.trigger.add("Disco Handled", self.checkHash)
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84 self.hash_cache = PersistentBinaryDict(NS_ENTITY_CAPABILITY) # key = hash or jid, value = features
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85 self.hash_cache.load()
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86 self.jid_hash = {} # jid to hash mapping, map to a discoInfo features if the hash method is unknown
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87
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88 def checkHash(self, profile):
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89 if not XEP_0115.cap_hash:
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90 XEP_0115.cap_hash = self.generateHash(profile)
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91 else:
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92 self.presenceHack(profile)
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93 return True
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94
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95 def getHandler(self, profile):
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96 return XEP_0115_handler(self, profile)
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97
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98 def presenceHack(self, profile):
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99 """modify SatPresenceProtocol to add capabilities data"""
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100 client = self.host.getClient(profile)
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101 presenceInst = client.presence
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102 c_elt = domish.Element((NS_ENTITY_CAPABILITY, 'c'))
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103 c_elt['hash'] = 'sha-1'
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104 c_elt['node'] = 'http://sat.goffi.org'
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105 c_elt['ver'] = XEP_0115.cap_hash
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106 presenceInst._c_elt = c_elt
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107 if "_legacy_send" in dir(presenceInst):
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108 debug('capabilities already added to presence instance')
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109 return
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110
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111 def hacked_send(self, obj):
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112 obj.addChild(self._c_elt)
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113 self._legacy_send(obj)
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114 new_send = types.MethodType(hacked_send, presenceInst, presenceInst.__class__)
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115 presenceInst._legacy_send = presenceInst.send
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116 presenceInst.send = new_send
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117
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118 def generateHash(self, profile_key="@DEFAULT@"):
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119 """This method generate a sha1 hash as explained in xep-0115 #5.1
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120 it then store it in XEP_0115.cap_hash"""
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121 profile = self.host.memory.getProfileName(profile_key)
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122 if not profile:
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123 error('Requesting hash for an inexistant profile')
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124 raise HashGenerationError
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125
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126 client = self.host.getClient(profile_key)
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127 if not client:
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128 error('Requesting hash for an inexistant client')
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129 raise HashGenerationError
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130
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131 def generateHash_2(services, profile):
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132 _s = []
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Goffi <goffi@goffi.org>
parents: 609
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133 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
594
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parents: 588
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134 byte_identities.sort(key=lambda i: i.lang)
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parents: 588
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135 byte_identities.sort(key=lambda i: i.idType)
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136 byte_identities.sort(key=lambda i: i.category)
282
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Goffi <goffi@goffi.org>
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137 for identity in byte_identities:
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Goffi <goffi@goffi.org>
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138 _s.append(str(identity))
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139 _s.append('<')
667
a79a6843928c plugin XEP-0115: changed node for "http://sat.goffi.org" + filtering using list comprehension instead of filter()
Goffi <goffi@goffi.org>
parents: 609
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140 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
594
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parents: 588
diff changeset
141 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
282
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Goffi <goffi@goffi.org>
parents:
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142 for feature in byte_features:
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
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143 _s.append(feature)
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Goffi <goffi@goffi.org>
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144 _s.append('<')
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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145 #TODO: manage XEP-0128 data form here
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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146 XEP_0115.cap_hash = b64encode(sha1(''.join(_s)).digest())
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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147 debug(_('Capability hash generated: [%s]') % XEP_0115.cap_hash)
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Goffi <goffi@goffi.org>
parents:
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148 self.presenceHack(profile)
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 572
diff changeset
149
282
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Goffi <goffi@goffi.org>
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150 services = client.discoHandler.info(client.jid, client.jid, '').addCallback(generateHash_2, profile)
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 572
diff changeset
151
594
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
152
282
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Goffi <goffi@goffi.org>
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153 class XEP_0115_handler(XMPPHandler):
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Goffi <goffi@goffi.org>
parents:
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154 implements(iwokkel.IDisco)
587
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parents: 572
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155
282
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156 def __init__(self, plugin_parent, profile):
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157 self.plugin_parent = plugin_parent
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Goffi <goffi@goffi.org>
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158 self.host = plugin_parent.host
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Goffi <goffi@goffi.org>
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159 self.profile = profile
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Goffi <goffi@goffi.org>
parents:
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160
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Goffi <goffi@goffi.org>
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161 def connectionInitialized(self):
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Goffi <goffi@goffi.org>
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162 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
587
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 572
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163
282
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Goffi <goffi@goffi.org>
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164 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
6a0c6d8e119d added plugin xep-0115: entity capabilities
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165 return [disco.DiscoFeature(NS_ENTITY_CAPABILITY)]
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parents:
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166
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167 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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168 return []
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169
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Goffi <goffi@goffi.org>
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170 def _updateCache(self, discoResult, from_jid, key):
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Goffi <goffi@goffi.org>
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171 """Actually update the cache
437
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
172 @param discoResult: result of the requestInfo"""
282
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Goffi <goffi@goffi.org>
parents:
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173 if key:
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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174 self.plugin_parent.jid_hash[from_jid] = key
437
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
175 self.plugin_parent.hash_cache[key] = discoResult.features
282
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parents:
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176 else:
437
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
177 #No key, that means unknown hash method
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
178 self.plugin_parent.jid_hash[from_jid] = discoResult.features
282
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Goffi <goffi@goffi.org>
parents:
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179
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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180 def update(self, presence):
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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181 """
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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182 Manage the capabilities of the entity
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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183 Check if we know the version of this capatilities
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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184 and get the capibilities if necessary
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Goffi <goffi@goffi.org>
parents:
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185 """
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
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186 from_jid = jid.JID(presence['from'])
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
187 c_elem = filter(lambda x: x.name == "c", presence.elements())[0] # We only want the "c" element
282
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Goffi <goffi@goffi.org>
parents:
diff changeset
188 try:
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
189 ver = c_elem['ver']
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
190 hash = c_elem['hash']
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
191 node = c_elem['node']
282
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Goffi <goffi@goffi.org>
parents:
diff changeset
192 except KeyError:
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
193 warning('Received invalid capabilities tag')
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
194 return
437
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
195 if not from_jid in self.plugin_parent.jid_hash:
02c633a0ddcf plugin XEP-0115: entity capabilities now use PersistentBinaryDict to store hash cache
Goffi <goffi@goffi.org>
parents: 291
diff changeset
196 if ver in self.plugin_parent.hash_cache:
282
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Goffi <goffi@goffi.org>
parents:
diff changeset
197 #we know that hash, we just link it with the jid
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
198 self.plugin_parent.jid_hash[from_jid] = ver
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
199 else:
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
200 if hash != 'sha-1':
282
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
201 #unknown hash method
6a0c6d8e119d added plugin xep-0115: entity capabilities
Goffi <goffi@goffi.org>
parents:
diff changeset
202 warning('Unknown hash for entity capabilities: [%s]' % hash)
594
e629371a28d3 Fix pep8 support in src/plugins.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 588
diff changeset
203 self.parent.disco.requestInfo(from_jid).addCallback(self._updateCache, from_jid, ver if hash == 'sha-1' else None)
282
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Goffi <goffi@goffi.org>
parents:
diff changeset
204 #TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3