Mercurial > libervia-backend

annotate src/memory/disco.py @ 1202:101c06fbda31

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misc: fixed typos in README
author Matteo Cypriani <mcy@lm7.fr>
date Mon, 15 Sep 2014 14:18:27 +0200
parents 7d640c303140
children 8ad37c3d58a9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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: a jabber client
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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 import exceptions
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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.protocols.jabber import jid
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25 from twisted.words.protocols.jabber.error import StanzaError
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26 from twisted.internet import defer
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27 from twisted.internet import reactor
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28 from sat.core.constants import Const as C
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29 from wokkel import disco
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30 from base64 import b64encode
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31 from hashlib import sha1
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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 TIMEOUT = 15
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38
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39 class HashGenerationError(Exception):
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40 pass
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42
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43 class ByteIdentity(object):
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44 """This class manage identity as bytes (needed for i;octet sort), it is used for the hash generation"""
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46 def __init__(self, identity, lang=None):
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47 assert isinstance(identity, disco.DiscoIdentity)
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48 self.category = identity.category.encode('utf-8')
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49 self.idType = identity.type.encode('utf-8')
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50 self.name = identity.name.encode('utf-8') if identity.name else ''
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51 self.lang = lang.encode('utf-8') if lang is not None else ''
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52
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53 def __str__(self):
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54 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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55
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56
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57 class Discovery(object):
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58 """ Manage capabilities of entities """
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59
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60 def __init__(self, host):
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61 self.host = host
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62 self.hashes = {} # key: capability hash, value: disco features/identities
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63 # TODO: save hashes in databse, remove legacy hashes
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64
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65 @defer.inlineCallbacks
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66 def hasFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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67 """Tell if an entity has the required feature
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68
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69 @param feature: feature namespace
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70 @param jid_: jid of the target, or None for profile's server
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71 @param profile_key: %(doc_profile_key)s
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72 @return: a Deferred which fire a boolean (True if feature is available)
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73 """
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74 disco_infos = yield self.getInfos(jid_, profile_key)
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75 defer.returnValue(feature in disco_infos.features)
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77 @defer.inlineCallbacks
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78 def checkFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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79 """Like hasFeature, but raise an exception is feature is not Found
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80
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81 @param feature: feature namespace
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82 @param jid_: jid of the target, or None for profile's server
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83 @param profile_key: %(doc_profile_key)s
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84 @return: None if feature is found
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85
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86 @raise: exceptions.FeatureNotFound
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87 """
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88 disco_infos = yield self.getInfos(jid_, profile_key)
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89 if not feature in disco_infos.features:
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90 raise exceptions.FeatureNotFound
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91 defer.returnValue(feature in disco_infos)
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93 def getInfos(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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94 """get disco infos from jid_, filling capability hash if needed
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96 @param jid_: jid of the target, or None for profile's server
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97 @param profile_key: %(doc_profile_key)s
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98 @return: a Deferred which fire disco.DiscoInfo
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99 """
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100 client = self.host.getClient(profile_key)
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101 if jid_ is None:
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102 jid_ = jid.JID(client.jid.host)
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103 try:
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104 cap_hash = self.host.memory.getEntityData(jid_, [C.ENTITY_CAP_HASH], client.profile)[C.ENTITY_CAP_HASH]
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105 disco_infos = self.hashes[cap_hash]
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106 return defer.succeed(disco_infos)
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107 except KeyError:
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108 # capability hash is not available, we'll compute one
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109 def infosCb(disco_infos):
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110 cap_hash = self.generateHash(disco_infos)
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111 self.hashes[cap_hash] = disco_infos
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112 self.host.memory.updateEntityData(jid_, C.ENTITY_CAP_HASH, cap_hash, client.profile)
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113 return disco_infos
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114 d = client.disco.requestInfo(jid_)
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115 d.addCallback(infosCb)
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116 return d
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117
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118 @defer.inlineCallbacks
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119 def getItems(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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120 """get disco items from jid_, cache them for our own server
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121
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122 @param jid_: jid of the target, or None for profile's server
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123 @param profile_key: %(doc_profile_key)s
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124 @return: a Deferred which fire disco.DiscoItems
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125 """
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126 client = self.host.getClient(profile_key)
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127 if jid_ is None:
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128 jid_ = jid.JID(client.jid.host)
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129 # we cache items only for our own server
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130 try:
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131 items = self.host.memory.getEntityData(jid_, ["DISCO_ITEMS"], client.profile)["DISCO_ITEMS"]
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132 log.debug("[%s] disco items are in cache" % jid_.full())
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133 except KeyError:
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134 log.debug("Caching [%s] disco items" % jid_.full())
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135 items = yield client.disco.requestItems(jid_)
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136 self.host.memory.updateEntityData(jid_, "DISCO_ITEMS", items, client.profile)
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137 else:
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138 items = yield client.disco.requestItems(jid_)
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139
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140 defer.returnValue(items)
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141
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142
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143 def _infosEb(self, failure, entity_jid):
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144 failure.trap(StanzaError)
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145 log.warning(_("Error while requesting [%(jid)s]: %(error)s") % {'jid': entity_jid.full(),
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146 'error': failure.getErrorMessage()})
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147
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148 def findServiceEntities(self, category, type_, jid_=None, profile_key=C.PROF_KEY_NONE):
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149 """Return all available items of an entity which correspond to (category, type_)
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150
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151 @param category: identity's category
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152 @param type_: identitiy's type
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153 @param jid_: the jid of the target server (None for profile's server)
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154 @param profile_key: %(doc_profile_key)s
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155 @return: a set of entities or None if no cached data were found
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156 """
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157 found_entities = set()
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158
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159 def infosCb(infos, entity_jid):
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160 if (category, type_) in infos.identities:
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161 found_entities.add(entity_jid)
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162
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163 def gotItems(items):
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164 defers_list = []
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165 for item in items:
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166 info_d = self.getInfos(item.entity, profile_key)
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167 info_d.addCallbacks(infosCb, self._infosEb, [item.entity], None, [item.entity])
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168 defers_list.append(info_d)
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169 return defer.DeferredList(defers_list)
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170
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171 d = self.getItems(jid_, profile_key)
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172 d.addCallback(gotItems)
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173 d.addCallback(lambda dummy: found_entities)
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174 reactor.callLater(TIMEOUT, d.cancel) # FIXME: one bad service make a general timeout
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175 return d
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176
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177 def findFeaturesSet(self, features, category=None, type_=None, jid_=None, profile_key=C.PROF_KEY_NONE):
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178 """Return entities (including jid_ and its items) offering features
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179
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180 @param features: iterable of features which must be present
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181 @param category: if not None, accept only this category
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182 @param type_: if not None, accept only this type
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183 @param jid_: the jid of the target server (None for profile's server)
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184 @param profile_key: %(doc_profile_key)s
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185 @return: a set of found entities
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186 """
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187 client = self.host.getClient(profile_key)
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188 if jid_ is None:
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189 jid_ = jid.JID(client.jid.host)
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190 features = set(features)
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191 found_entities = set()
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192
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193 def infosCb(infos, entity):
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194 if category is not None or type_ is not None:
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195 categories = set()
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196 types = set()
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197 for identity in infos.identities:
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198 id_cat, id_type = identity
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199 categories.add(id_cat)
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200 types.add(id_type)
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201 if category is not None and category not in categories:
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202 return
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203 if type_ is not None and type_ not in types:
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204 return
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205 if features.issubset(infos.features):
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206 found_entities.add(entity)
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207
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208 def gotItems(items):
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209 defer_list = []
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210 for entity in [jid_] + [item.entity for item in items]:
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211 infos_d = self.getInfos(entity, profile_key)
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212 infos_d.addCallbacks(infosCb, self._infosEb, [entity], None, [entity])
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213 defer_list.append(infos_d)
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214 return defer.DeferredList(defer_list)
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215
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216 d = self.getItems(jid_, profile_key)
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217 d.addCallback(gotItems)
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218 d.addCallback(lambda dummy: found_entities)
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219 reactor.callLater(TIMEOUT, d.cancel) # FIXME: one bad service make a general timeout
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220 return d
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221
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222 def generateHash(self, services):
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223 """ Generate a unique hash for given service
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224
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225 hash algorithm is the one described in XEP-0115
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diff changeset
226 @param services: iterable of disco.DiscoIdentity/disco.DiscoFeature, as returned by discoHandler.info
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227
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228 """
944
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diff changeset
229 s = []
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parents: 941
diff changeset
230 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
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parents: 941
diff changeset
231 byte_identities.sort(key=lambda i: i.lang)
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parents: 941
diff changeset
232 byte_identities.sort(key=lambda i: i.idType)
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parents: 941
diff changeset
233 byte_identities.sort(key=lambda i: i.category)
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
234 for identity in byte_identities:
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
235 s.append(str(identity))
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
236 s.append('<')
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
237 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
238 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
239 for feature in byte_features:
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
240 s.append(feature)
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
241 s.append('<')
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
242 #TODO: manage XEP-0128 data form here
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
243 cap_hash = b64encode(sha1(''.join(s)).digest())
993
301b342c697a core: use of the new core.log module:
Goffi <goffi@goffi.org>
parents: 973
diff changeset
244 log.debug(_('Capability hash generated: [%s]') % cap_hash)
944
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
245 return cap_hash
963
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
246
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
247 @defer.inlineCallbacks
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
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parents: 961
diff changeset
248 def _discoInfos(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
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parents: 961
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249 """ Discovery method for the bridge
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Goffi <goffi@goffi.org>
parents: 961
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250 @param entity_jid_s: entity we want to discover
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251
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
252 @return: list of tu"""
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
253 entity = jid.JID(entity_jid_s)
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parents: 961
diff changeset
254 disco_infos = yield self.getInfos(entity, profile_key)
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parents: 961
diff changeset
255 defer.returnValue((disco_infos.features, [(cat, type_, name or '') for (cat, type_), name in disco_infos.identities.items()]))
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parents: 961
diff changeset
256
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
257 @defer.inlineCallbacks
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parents: 961
diff changeset
258 def _discoItems(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
259 """ Discovery method for the bridge
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
260 @param entity_jid_s: entity we want to discover
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parents: 961
diff changeset
261
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
262 @return: list of tu"""
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
263 entity = jid.JID(entity_jid_s)
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
264 disco_items = yield self.getItems(entity, profile_key)
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parents: 961
diff changeset
265 defer.returnValue([(item.entity.full(), item.nodeIdentifier or '', item.name or '') for item in disco_items])