Mercurial > libervia-backend

annotate src/plugins/plugin_xep_0115.py @ 941:c6d8fc63b1db

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core, plugins: host.getClient now raise an exception instead of returning None when no profile is found, plugins have been adapted consequently and a bit cleaned
author Goffi <goffi@goffi.org>
date Fri, 28 Mar 2014 18:07:02 +0100
parents 1a759096ccbd
children e1842ebcb2f3
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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 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 sat.memory.persistent import PersistentBinaryDict
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26 import types
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27
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28 from zope.interface import implements
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29
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30 from wokkel import disco, iwokkel
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31
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32 from hashlib import sha1
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33 from base64 import b64encode
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34
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35 try:
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36 from twisted.words.protocols.xmlstream import XMPPHandler
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37 except ImportError:
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38 from wokkel.subprotocols import XMPPHandler
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39
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40 PRESENCE = '/presence'
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41 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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42 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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43
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44 PLUGIN_INFO = {
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45 "name": "XEP 0115 Plugin",
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46 "import_name": "XEP-0115",
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47 "type": "XEP",
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48 "protocols": ["XEP-0115"],
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49 "dependencies": [],
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50 "main": "XEP_0115",
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51 "handler": "yes",
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52 "description": _("""Implementation of entity capabilities""")
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53 }
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55
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56 class HashGenerationError(Exception):
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57 pass
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58
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59
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60 class ByteIdentity(object):
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61 """This class manage identity as bytes (needed for i;octet sort),
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62 it is used for the hash generation"""
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63
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64 def __init__(self, identity, lang=None):
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65 assert isinstance(identity, disco.DiscoIdentity)
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66 self.category = identity.category.encode('utf-8')
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67 self.idType = identity.type.encode('utf-8')
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68 self.name = identity.name.encode('utf-8') if identity.name else ''
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69 self.lang = lang.encode('utf-8') if lang else ''
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70
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71 def __str__(self):
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72 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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73
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74
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75 class XEP_0115(object):
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76 cap_hash = None # capabilities hash is class variable as it is common to all profiles
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77 #TODO: this code is really dirty, need to clean it and try to move it to Wokkel
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78
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79 def __init__(self, host):
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80 info(_("Plugin XEP_0115 initialization"))
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81 self.host = host
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82 host.trigger.add("Disco Handled", self.checkHash)
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83 self.hash_cache = PersistentBinaryDict(NS_ENTITY_CAPABILITY) # key = hash or jid, value = features
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84 self.hash_cache.load()
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85 self.jid_hash = {} # jid to hash mapping, map to a discoInfo features if the hash method is unknown
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86
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87 def checkHash(self, profile):
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88 if not XEP_0115.cap_hash:
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89 XEP_0115.cap_hash = self.generateHash(profile)
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90 else:
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91 self.presenceHack(profile)
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92 return True
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93
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94 def getHandler(self, profile):
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95 return XEP_0115_handler(self, profile)
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96
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97 def presenceHack(self, profile):
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98 """modify SatPresenceProtocol to add capabilities data"""
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99 client = self.host.getClient(profile)
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100 presenceInst = client.presence
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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'] = 'http://sat.goffi.org'
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104 c_elt['ver'] = XEP_0115.cap_hash
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105 presenceInst._c_elt = c_elt
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106 if "_legacy_send" in dir(presenceInst):
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107 debug('capabilities already added to presence instance')
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108 return
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109
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110 def hacked_send(self, obj):
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111 obj.addChild(self._c_elt)
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112 self._legacy_send(obj)
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113 new_send = types.MethodType(hacked_send, presenceInst, presenceInst.__class__)
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114 presenceInst._legacy_send = presenceInst.send
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115 presenceInst.send = new_send
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116
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117 def generateHash(self, profile_key=C.PROF_KEY_NONE):
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118 """This method generate a sha1 hash as explained in xep-0115 #5.1
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119 it then store it in XEP_0115.cap_hash"""
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120 profile = self.host.memory.getProfileName(profile_key)
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121 if not profile:
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122 error('Requesting hash for an inexistant profile')
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123 raise HashGenerationError
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124
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125 client = self.host.getClient(profile_key)
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126
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127 def generateHash_2(services, profile):
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128 _s = []
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129 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
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130 byte_identities.sort(key=lambda i: i.lang)
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131 byte_identities.sort(key=lambda i: i.idType)
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132 byte_identities.sort(key=lambda i: i.category)
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133 for identity in byte_identities:
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134 _s.append(str(identity))
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135 _s.append('<')
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136 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
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137 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
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138 for feature in byte_features:
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139 _s.append(feature)
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140 _s.append('<')
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141 #TODO: manage XEP-0128 data form here
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142 XEP_0115.cap_hash = b64encode(sha1(''.join(_s)).digest())
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143 debug(_('Capability hash generated: [%s]') % XEP_0115.cap_hash)
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144 self.presenceHack(profile)
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145
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146 client.discoHandler.info(client.jid, client.jid, '').addCallback(generateHash_2, profile)
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147
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148
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149 class XEP_0115_handler(XMPPHandler):
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150 implements(iwokkel.IDisco)
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151
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152 def __init__(self, plugin_parent, profile):
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153 self.plugin_parent = plugin_parent
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154 self.host = plugin_parent.host
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155 self.profile = profile
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156
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157 def connectionInitialized(self):
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158 self.xmlstream.addObserver(CAPABILITY_UPDATE, self.update)
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159
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160 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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161 return [disco.DiscoFeature(NS_ENTITY_CAPABILITY)]
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162
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163 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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164 return []
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165
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166 def _updateCache(self, discoResult, from_jid, key):
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167 """Actually update the cache
437
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168 @param discoResult: result of the requestInfo"""
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169 if key:
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170 self.plugin_parent.jid_hash[from_jid] = key
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171 self.plugin_parent.hash_cache[key] = discoResult.features
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172 else:
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173 #No key, that means unknown hash method
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174 self.plugin_parent.jid_hash[from_jid] = discoResult.features
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175
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176 def update(self, presence):
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177 """
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178 Manage the capabilities of the entity
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179 Check if we know the version of this capatilities
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180 and get the capibilities if necessary
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181 """
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182 from_jid = jid.JID(presence['from'])
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183 c_elem = filter(lambda x: x.name == "c", presence.elements())[0] # We only want the "c" element
282
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184 try:
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185 ver = c_elem['ver']
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186 hash = c_elem['hash']
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187 node = c_elem['node']
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188 except KeyError:
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189 warning('Received invalid capabilities tag')
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190 return
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191 if not from_jid in self.plugin_parent.jid_hash:
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192 if ver in self.plugin_parent.hash_cache:
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193 #we know that hash, we just link it with the jid
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194 self.plugin_parent.jid_hash[from_jid] = ver
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195 else:
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196 if hash != 'sha-1':
282
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197 #unknown hash method
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198 warning('Unknown hash for entity capabilities: [%s]' % hash)
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199 self.parent.disco.requestInfo(from_jid).addCallback(self._updateCache, from_jid, ver if hash == 'sha-1' else None)
282
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200 #TODO: me must manage the full algorithm described at XEP-0115 #5.4 part 3