annotate src/memory/disco.py @ 965:5b95ce21c2d3

jp: fixed jid unicode decoding
author Goffi <goffi@goffi.org>
date Tue, 01 Apr 2014 21:16:02 +0200
parents 723f28cd15c7
children 4a8903021fda
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 logging import debug, info, warning, error
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23 from twisted.words.protocols.jabber import jid
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24 from twisted.internet import defer
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25 from sat.core.constants import Const as C
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26 from wokkel import disco
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27 from base64 import b64encode
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28 from hashlib import sha1
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31 PRESENCE = '/presence'
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32 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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33 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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34
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35 class HashGenerationError(Exception):
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36 pass
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37
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38
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39 class ByteIdentity(object):
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40 """This class manage identity as bytes (needed for i;octet sort), it is used for the hash generation"""
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41
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42 def __init__(self, identity, lang=None):
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43 assert isinstance(identity, disco.DiscoIdentity)
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44 self.category = identity.category.encode('utf-8')
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45 self.idType = identity.type.encode('utf-8')
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46 self.name = identity.name.encode('utf-8') if identity.name else ''
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47 self.lang = lang.encode('utf-8') if lang is not None else ''
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49 def __str__(self):
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50 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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53 class Discovery(object):
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54 """ Manage capabilities of entities """
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55
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56 def __init__(self, host):
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57 self.host = host
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58 self.hashes = {} # key: capability hash, value: disco features/identities
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59 # TODO: save hashes in databse, remove legacy hashes
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61 @defer.inlineCallbacks
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62 def hasFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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63 """Tell if an entity has the required feature
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64
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65 @param feature: feature namespace
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66 @param jid_: jid of the target, or None for profile's server
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67 @param profile_key: %(doc_profile_key)s
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68 @return: a Deferred which fire a boolean (True if feature is available)
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69 """
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70 disco_info = yield self.getInfos(jid_, profile_key)
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71 defer.returnValue(feature in disco_info.features)
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72
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73 @defer.inlineCallbacks
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74 def checkFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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75 """Like hasFeature, but raise an exception is feature is not Found
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76
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77 @param feature: feature namespace
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78 @param jid_: jid of the target, or None for profile's server
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79 @param profile_key: %(doc_profile_key)s
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80 @return: None if feature is found
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81
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82 @raise: exceptions.FeatureNotFound
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83 """
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84 disco_info = yield self.getInfos(jid_, profile_key)
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85 if not feature in disco_info.features:
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86 raise exceptions.FeatureNotFound
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87 defer.returnValue(feature in disco_info)
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88
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89 @defer.inlineCallbacks
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90 def getInfos(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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91 """get disco infos from jid_, filling capability hash if needed
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93 @param jid_: jid of the target, or None for profile's server
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94 @param profile_key: %(doc_profile_key)s
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95 @return: a Deferred which fire disco.DiscoInfo
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96 """
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97 client = self.host.getClient(profile_key)
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98 if jid_ is None:
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99 jid_ = jid.JID(client.jid.host)
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100 try:
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101 cap_hash = self.host.memory.getEntityData(jid_, [C.ENTITY_CAP_HASH], client.profile)[C.ENTITY_CAP_HASH]
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102 disco_info = self.hashes[cap_hash]
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103 except KeyError:
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104 # capability hash is not available, we'll compute one
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105 disco_info = yield client.disco.requestInfo(jid_)
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106 cap_hash = self.generateHash(disco_info)
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107 self.hashes[cap_hash] = disco_info
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108 yield self.host.memory.updateEntityData(jid_, C.ENTITY_CAP_HASH, cap_hash, client.profile)
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109 defer.returnValue(disco_info)
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110
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111 @defer.inlineCallbacks
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112 def getItems(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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113 """get disco items from jid_, cache them for our own server
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114
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115 @param jid_: jid of the target, or None for profile's server
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116 @param profile_key: %(doc_profile_key)s
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117 @return: a Deferred which fire disco.DiscoItems
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118 """
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119 client = self.host.getClient(profile_key)
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120 if jid_ is None:
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121 jid_ = jid.JID(client.jid.host)
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122 # we cache items only for our own server
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123 try:
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124 items = self.host.memory.getEntityData(jid_, ["DISCO_ITEMS"], client.profile)["DISCO_ITEMS"]
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125 debug("[%s] disco items are in cache" % jid_.full())
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126 except KeyError:
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127 debug("Caching [%s] disco items" % jid_.full())
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128 items = yield client.disco.requestItems(jid_)
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129 self.host.memory.updateEntityData(jid_, "DISCO_ITEMS", items, client.profile)
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130 else:
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131 items = yield client.disco.requestItems(jid_)
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132
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133 defer.returnValue(items)
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134
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135
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136 @defer.inlineCallbacks
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137 def findServiceEntities(self, category, type_, jid_=None, profile_key=C.PROF_KEY_NONE):
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138 """Return all available items of an entity which correspond to (category, type_)
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139
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140 @param category: identity's category
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141 @param type_: identitiy's type
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142 @param jid_: the jid of the target server (None for profile's server)
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parents: 941
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143 @param profile_key: %(doc_profile_key)s
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144 @return: a set of entities or None if no cached data were found
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145 """
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Goffi <goffi@goffi.org>
parents: 941
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146 found_identities = set()
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parents: 941
diff changeset
147 items = yield self.getItems(jid_, profile_key)
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148 for item in items:
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parents: 941
diff changeset
149 infos = yield self.getInfos(item.entity, profile_key)
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parents: 941
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150 if (category, type_) in infos.identities:
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parents: 941
diff changeset
151 found_identities.add(item.entity)
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152
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153 defer.returnValue(found_identities)
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154
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parents: 941
diff changeset
155 @defer.inlineCallbacks
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
156 def findFeaturesSet(self, features, category=None, type_=None, jid_=None, profile_key=C.PROF_KEY_NONE):
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parents: 941
diff changeset
157 """Return entities (including jid_ and its items) offering features
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158
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159 @param features: iterable of features which must be present
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parents: 941
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160 @param category: if not None, accept only this category
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parents: 941
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161 @param type_: if not None, accept only this type
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parents: 941
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162 @param jid_: the jid of the target server (None for profile's server)
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parents: 941
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163 @param profile_key: %(doc_profile_key)s
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parents: 941
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164 @return: a set of found entities
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parents: 941
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165 """
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parents: 941
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166 client = self.host.getClient(profile_key)
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parents: 941
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167 if jid_ is None:
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parents: 941
diff changeset
168 jid_ = jid.JID(client.jid.host)
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parents: 941
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169 features = set(features)
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170 found_entities = set()
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171
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diff changeset
172 items = yield self.getItems(jid_, profile_key)
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0e8c2414f89c memory (disco): bug fix in findFeaturesSet
souliane <souliane@mailoo.org>
parents: 951
diff changeset
173 for entity in [jid_] + [item.entity for item in items]:
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174 infos = yield self.getInfos(entity, profile_key)
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parents: 941
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175 if category is not None or type_ is not None:
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parents: 941
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176 categories = set()
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177 types = set()
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178 for identity in infos.identities:
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179 id_cat, id_type = identity
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180 categories.add(id_cat)
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181 types.add(id_type)
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182 if category is not None and category not in categories:
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diff changeset
183 continue
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184 if type_ is not None and type_ not in types:
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185 continue
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parents: 941
diff changeset
186 if features.issubset(infos.features):
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diff changeset
187 found_entities.add(entity)
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188
944
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189 defer.returnValue(found_entities)
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190
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191 def generateHash(self, services):
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192 """ Generate a unique hash for given service
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193
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194 hash algorithm is the one described in XEP-0115
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195 @param services: iterable of disco.DiscoIdentity/disco.DiscoFeature, as returned by discoHandler.info
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196
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197 """
944
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198 s = []
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199 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
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diff changeset
200 byte_identities.sort(key=lambda i: i.lang)
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diff changeset
201 byte_identities.sort(key=lambda i: i.idType)
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parents: 941
diff changeset
202 byte_identities.sort(key=lambda i: i.category)
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203 for identity in byte_identities:
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204 s.append(str(identity))
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diff changeset
205 s.append('<')
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diff changeset
206 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
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parents: 941
diff changeset
207 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
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diff changeset
208 for feature in byte_features:
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diff changeset
209 s.append(feature)
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diff changeset
210 s.append('<')
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diff changeset
211 #TODO: manage XEP-0128 data form here
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parents: 941
diff changeset
212 cap_hash = b64encode(sha1(''.join(s)).digest())
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parents: 941
diff changeset
213 debug(_('Capability hash generated: [%s]') % cap_hash)
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parents: 941
diff changeset
214 return cap_hash
963
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diff changeset
215
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diff changeset
216 @defer.inlineCallbacks
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parents: 961
diff changeset
217 def _discoInfos(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
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parents: 961
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218 """ Discovery method for the bridge
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parents: 961
diff changeset
219 @param entity_jid_s: entity we want to discover
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diff changeset
220
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221 @return: list of tu"""
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parents: 961
diff changeset
222 entity = jid.JID(entity_jid_s)
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parents: 961
diff changeset
223 disco_infos = yield self.getInfos(entity, profile_key)
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
224 defer.returnValue((disco_infos.features, [(cat, type_, name or '') for (cat, type_), name in disco_infos.identities.items()]))
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diff changeset
225
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diff changeset
226 @defer.inlineCallbacks
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parents: 961
diff changeset
227 def _discoItems(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
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Goffi <goffi@goffi.org>
parents: 961
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228 """ Discovery method for the bridge
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
229 @param entity_jid_s: entity we want to discover
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
230
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
231 @return: list of tu"""
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
232 entity = jid.JID(entity_jid_s)
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parents: 961
diff changeset
233 disco_items = yield self.getItems(entity, profile_key)
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
234 defer.returnValue([(item.entity.full(), item.nodeIdentifier or '', item.name or '') for item in disco_items])