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annotate src/plugins/plugin_xep_0115.py @ 888:d0ed6993d562

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SàT 0.4.1 released
author Goffi <goffi@goffi.org>
date Fri, 28 Feb 2014 15:03:34 +0100
parents 1fe00f0c9a91
children 1a759096ccbd
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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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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 logging import debug, info, error, warning
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22 from twisted.words.xish import domish
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23 from twisted.words.protocols.jabber import client, jid, xmlstream
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24 from twisted.words.protocols.jabber import error as jab_error
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25 from twisted.words.protocols.jabber.xmlstream import IQ
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26 from sat.memory.persistent import PersistentBinaryDict
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27 import os.path
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28 import types
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29
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30 from zope.interface import implements
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31
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32 from wokkel import disco, iwokkel
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33
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34 from hashlib import sha1
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35 from base64 import b64encode
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36
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37 try:
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38 from twisted.words.protocols.xmlstream import XMPPHandler
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39 except ImportError:
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40 from wokkel.subprotocols import XMPPHandler
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41
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42 PRESENCE = '/presence'
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43 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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44 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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45
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46 PLUGIN_INFO = {
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47 "name": "XEP 0115 Plugin",
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48 "import_name": "XEP-0115",
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49 "type": "XEP",
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50 "protocols": ["XEP-0115"],
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51 "dependencies": [],
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52 "main": "XEP_0115",
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53 "handler": "yes",
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54 "description": _("""Implementation of entity capabilities""")
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55 }
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57
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58 class HashGenerationError(Exception):
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59 pass
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61
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62 class ByteIdentity(object):
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63 """This class manage identity as bytes (needed for i;octet sort),
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64 it is used for the hash generation"""
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65
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66 def __init__(self, identity, lang=None):
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67 assert isinstance(identity, disco.DiscoIdentity)
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68 self.category = identity.category.encode('utf-8')
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69 self.idType = identity.type.encode('utf-8')
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70 self.name = identity.name.encode('utf-8') if identity.name else ''
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71 self.lang = lang.encode('utf-8') if lang else ''
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72
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73 def __str__(self):
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74 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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75
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76
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77 class XEP_0115(object):
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78 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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79 #TODO: this code is really dirty, need to clean it and try to move it to Wokkel
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80
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81 def __init__(self, host):
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82 info(_("Plugin XEP_0115 initialization"))
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83 self.host = host
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84 host.trigger.add("Disco Handled", self.checkHash)
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85 self.hash_cache = PersistentBinaryDict(NS_ENTITY_CAPABILITY) # key = hash or jid, value = features
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86 self.hash_cache.load()
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87 self.jid_hash = {} # jid to hash mapping, map to a discoInfo features if the hash method is unknown
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88
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89 def checkHash(self, profile):
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90 if not XEP_0115.cap_hash:
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91 XEP_0115.cap_hash = self.generateHash(profile)
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92 else:
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93 self.presenceHack(profile)
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94 return True
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95
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96 def getHandler(self, profile):
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97 return XEP_0115_handler(self, profile)
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98
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99 def presenceHack(self, profile):
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100 """modify SatPresenceProtocol to add capabilities data"""
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101 client = self.host.getClient(profile)
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102 presenceInst = client.presence
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103 c_elt = domish.Element((NS_ENTITY_CAPABILITY, 'c'))
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104 c_elt['hash'] = 'sha-1'
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105 c_elt['node'] = 'http://sat.goffi.org'
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106 c_elt['ver'] = XEP_0115.cap_hash
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107 presenceInst._c_elt = c_elt
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108 if "_legacy_send" in dir(presenceInst):
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109 debug('capabilities already added to presence instance')
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110 return
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111
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112 def hacked_send(self, obj):
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113 obj.addChild(self._c_elt)
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114 self._legacy_send(obj)
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115 new_send = types.MethodType(hacked_send, presenceInst, presenceInst.__class__)
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116 presenceInst._legacy_send = presenceInst.send
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117 presenceInst.send = new_send
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118
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119 def generateHash(self, profile_key="@DEFAULT@"):
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120 """This method generate a sha1 hash as explained in xep-0115 #5.1
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121 it then store it in XEP_0115.cap_hash"""
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122 profile = self.host.memory.getProfileName(profile_key)
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123 if not profile:
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124 error('Requesting hash for an inexistant profile')
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125 raise HashGenerationError
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126
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127 client = self.host.getClient(profile_key)
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128 if not client:
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129 error('Requesting hash for an inexistant client')
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130 raise HashGenerationError
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131
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132 def generateHash_2(services, profile):
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133 _s = []
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134 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
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135 byte_identities.sort(key=lambda i: i.lang)
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136 byte_identities.sort(key=lambda i: i.idType)
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137 byte_identities.sort(key=lambda i: i.category)
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138 for identity in byte_identities:
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139 _s.append(str(identity))
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140 _s.append('<')
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141 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
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142 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
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143 for feature in byte_features:
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144 _s.append(feature)
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145 _s.append('<')
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146 #TODO: manage XEP-0128 data form here
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147 XEP_0115.cap_hash = b64encode(sha1(''.join(_s)).digest())
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148 debug(_('Capability hash generated: [%s]') % XEP_0115.cap_hash)
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149 self.presenceHack(profile)
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150
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151 services = client.discoHandler.info(client.jid, client.jid, '').addCallback(generateHash_2, profile)
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152
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153
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154 class XEP_0115_handler(XMPPHandler):
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155 implements(iwokkel.IDisco)
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156
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157 def __init__(self, plugin_parent, profile):
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158 self.plugin_parent = plugin_parent
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159 self.host = plugin_parent.host
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160 self.profile = profile
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161
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162 def connectionInitialized(self):
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163 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
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164
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165 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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166 return [disco.DiscoFeature(NS_ENTITY_CAPABILITY)]
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167
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168 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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169 return []
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170
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171 def _updateCache(self, discoResult, from_jid, key):
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172 """Actually update the cache
437
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173 @param discoResult: result of the requestInfo"""
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174 if key:
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175 self.plugin_parent.jid_hash[from_jid] = key
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176 self.plugin_parent.hash_cache[key] = discoResult.features
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177 else:
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178 #No key, that means unknown hash method
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179 self.plugin_parent.jid_hash[from_jid] = discoResult.features
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180
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181 def update(self, presence):
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182 """
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183 Manage the capabilities of the entity
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184 Check if we know the version of this capatilities
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185 and get the capibilities if necessary
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186 """
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187 from_jid = jid.JID(presence['from'])
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188 c_elem = filter(lambda x: x.name == "c", presence.elements())[0] # We only want the "c" element
282
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189 try:
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190 ver = c_elem['ver']
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191 hash = c_elem['hash']
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192 node = c_elem['node']
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193 except KeyError:
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194 warning('Received invalid capabilities tag')
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195 return
437
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196 if not from_jid in self.plugin_parent.jid_hash:
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197 if ver in self.plugin_parent.hash_cache:
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198 #we know that hash, we just link it with the jid
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199 self.plugin_parent.jid_hash[from_jid] = ver
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200 else:
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201 if hash != 'sha-1':
282
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202 #unknown hash method
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203 warning('Unknown hash for entity capabilities: [%s]' % hash)
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204 self.parent.disco.requestInfo(from_jid).addCallback(self._updateCache, from_jid, ver if hash == 'sha-1' else None)
282
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205 #TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3