Mercurial > libervia-backend
annotate src/memory/disco.py @ 989:93359853e4bc
plugins XEP-0048, XEP-0049: feature is not checked anymore before using private XML storage, as feature announcement is not mandatory in XEP-0049
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Thu, 10 Apr 2014 16:12:50 +0200 |
| parents | 4a8903021fda |
| children | 301b342c697a |
| 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 |
| 811 | 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 |
| 771 | 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.words.protocols.jabber.error import StanzaError |
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25 from twisted.internet import defer |
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26 from sat.core.constants import Const as C |
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27 from wokkel import disco |
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28 from base64 import b64encode |
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29 from hashlib import sha1 |
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30 |
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31 |
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32 PRESENCE = '/presence' |
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33 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps' |
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34 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]' |
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35 |
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36 class HashGenerationError(Exception): |
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37 pass |
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38 |
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39 |
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40 class ByteIdentity(object): |
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41 """This class manage identity as bytes (needed for i;octet sort), it is used for the hash generation""" |
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42 |
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43 def __init__(self, identity, lang=None): |
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44 assert isinstance(identity, disco.DiscoIdentity) |
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45 self.category = identity.category.encode('utf-8') |
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46 self.idType = identity.type.encode('utf-8') |
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47 self.name = identity.name.encode('utf-8') if identity.name else '' |
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48 self.lang = lang.encode('utf-8') if lang is not None else '' |
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49 |
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50 def __str__(self): |
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51 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name) |
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52 |
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53 |
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54 class Discovery(object): |
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55 """ Manage capabilities of entities """ |
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56 |
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57 def __init__(self, host): |
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58 self.host = host |
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59 self.hashes = {} # key: capability hash, value: disco features/identities |
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60 # TODO: save hashes in databse, remove legacy hashes |
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61 |
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62 @defer.inlineCallbacks |
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63 def hasFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE): |
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64 """Tell if an entity has the required feature |
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65 |
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66 @param feature: feature namespace |
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67 @param jid_: jid of the target, or None for profile's server |
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68 @param profile_key: %(doc_profile_key)s |
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69 @return: a Deferred which fire a boolean (True if feature is available) |
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70 """ |
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71 disco_infos = yield self.getInfos(jid_, profile_key) |
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72 defer.returnValue(feature in disco_infos.features) |
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73 |
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74 @defer.inlineCallbacks |
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75 def checkFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE): |
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76 """Like hasFeature, but raise an exception is feature is not Found |
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77 |
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78 @param feature: feature namespace |
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79 @param jid_: jid of the target, or None for profile's server |
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80 @param profile_key: %(doc_profile_key)s |
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81 @return: None if feature is found |
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82 |
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83 @raise: exceptions.FeatureNotFound |
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84 """ |
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85 disco_infos = yield self.getInfos(jid_, profile_key) |
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86 if not feature in disco_infos.features: |
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87 raise exceptions.FeatureNotFound |
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88 defer.returnValue(feature in disco_infos) |
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89 |
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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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92 |
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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_infos = self.hashes[cap_hash] |
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103 return defer.succeed(disco_infos) |
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104 except KeyError: |
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105 # capability hash is not available, we'll compute one |
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106 def infosCb(disco_infos): |
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107 cap_hash = self.generateHash(disco_infos) |
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108 self.hashes[cap_hash] = disco_infos |
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109 self.host.memory.updateEntityData(jid_, C.ENTITY_CAP_HASH, cap_hash, client.profile) |
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110 return disco_infos |
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111 d = client.disco.requestInfo(jid_) |
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112 d.addCallback(infosCb) |
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113 return d |
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114 |
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115 @defer.inlineCallbacks |
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116 def getItems(self, jid_=None, profile_key=C.PROF_KEY_NONE): |
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117 """get disco items from jid_, cache them for our own server |
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118 |
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119 @param jid_: jid of the target, or None for profile's server |
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120 @param profile_key: %(doc_profile_key)s |
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121 @return: a Deferred which fire disco.DiscoItems |
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122 """ |
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123 client = self.host.getClient(profile_key) |
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124 if jid_ is None: |
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125 jid_ = jid.JID(client.jid.host) |
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126 # we cache items only for our own server |
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127 try: |
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128 items = self.host.memory.getEntityData(jid_, ["DISCO_ITEMS"], client.profile)["DISCO_ITEMS"] |
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129 debug("[%s] disco items are in cache" % jid_.full()) |
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130 except KeyError: |
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131 debug("Caching [%s] disco items" % jid_.full()) |
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132 items = yield client.disco.requestItems(jid_) |
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133 self.host.memory.updateEntityData(jid_, "DISCO_ITEMS", items, client.profile) |
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134 else: |
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135 items = yield client.disco.requestItems(jid_) |
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136 |
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137 defer.returnValue(items) |
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138 |
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139 |
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140 def _infosEb(self, failure, entity_jid): |
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141 failure.trap(StanzaError) |
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142 warning(_("Error while requesting [%(jid)s]: %(error)s") % {'jid': entity_jid.full(), |
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143 'error': failure.getErrorMessage()}) |
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144 |
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145 def findServiceEntities(self, category, type_, jid_=None, profile_key=C.PROF_KEY_NONE): |
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146 """Return all available items of an entity which correspond to (category, type_) |
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147 |
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148 @param category: identity's category |
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149 @param type_: identitiy's type |
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150 @param jid_: the jid of the target server (None for profile's server) |
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151 @param profile_key: %(doc_profile_key)s |
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152 @return: a set of entities or None if no cached data were found |
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153 """ |
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154 found_entities = set() |
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155 |
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156 def infosCb(infos, entity_jid): |
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157 if (category, type_) in infos.identities: |
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158 found_entities.add(entity_jid) |
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159 |
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160 def gotItems(items): |
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161 defers_list = [] |
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162 for item in items: |
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163 info_d = self.getInfos(item.entity, profile_key) |
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164 info_d.addCallbacks(infosCb, self._infosEb, [item.entity], None, [item.entity]) |
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165 defers_list.append(info_d) |
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166 return defer.DeferredList(defers_list) |
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167 |
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168 d = self.getItems(jid_, profile_key) |
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169 d.addCallback(gotItems) |
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170 d.addCallback(lambda dummy: found_entities) |
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171 return d |
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172 |
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173 def findFeaturesSet(self, features, category=None, type_=None, jid_=None, profile_key=C.PROF_KEY_NONE): |
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174 """Return entities (including jid_ and its items) offering features |
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175 |
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176 @param features: iterable of features which must be present |
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177 @param category: if not None, accept only this category |
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178 @param type_: if not None, accept only this type |
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179 @param jid_: the jid of the target server (None for profile's server) |
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180 @param profile_key: %(doc_profile_key)s |
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181 @return: a set of found entities |
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182 """ |
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183 client = self.host.getClient(profile_key) |
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184 if jid_ is None: |
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185 jid_ = jid.JID(client.jid.host) |
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186 features = set(features) |
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187 found_entities = set() |
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188 |
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189 def infosCb(infos, entity): |
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190 if category is not None or type_ is not None: |
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191 categories = set() |
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192 types = set() |
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193 for identity in infos.identities: |
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194 id_cat, id_type = identity |
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195 categories.add(id_cat) |
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196 types.add(id_type) |
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197 if category is not None and category not in categories: |
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198 return |
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199 if type_ is not None and type_ not in types: |
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200 return |
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201 if features.issubset(infos.features): |
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202 found_entities.add(entity) |
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203 |
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204 def gotItems(items): |
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205 defer_list = [] |
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206 for entity in [jid_] + [item.entity for item in items]: |
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207 infos_d = self.getInfos(entity, profile_key) |
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208 infos_d.addCallbacks(infosCb, self._infosEb, [entity], None, [entity]) |
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209 defer_list.append(infos_d) |
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210 return defer.DeferredList(defer_list) |
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211 |
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212 d = self.getItems(jid_, profile_key) |
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213 d.addCallback(gotItems) |
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214 d.addCallback(lambda dummy: found_entities) |
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215 return d |
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216 |
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217 def generateHash(self, services): |
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218 """ Generate a unique hash for given service |
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219 |
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220 hash algorithm is the one described in XEP-0115 |
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221 @param services: iterable of disco.DiscoIdentity/disco.DiscoFeature, as returned by discoHandler.info |
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222 |
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223 """ |
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224 s = [] |
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225 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here |
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226 byte_identities.sort(key=lambda i: i.lang) |
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227 byte_identities.sort(key=lambda i: i.idType) |
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228 byte_identities.sort(key=lambda i: i.category) |
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229 for identity in byte_identities: |
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230 s.append(str(identity)) |
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231 s.append('<') |
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232 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)] |
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233 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort |
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234 for feature in byte_features: |
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235 s.append(feature) |
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236 s.append('<') |
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237 #TODO: manage XEP-0128 data form here |
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238 cap_hash = b64encode(sha1(''.join(s)).digest()) |
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239 debug(_('Capability hash generated: [%s]') % cap_hash) |
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240 return cap_hash |
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241 |
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242 @defer.inlineCallbacks |
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243 def _discoInfos(self, entity_jid_s, profile_key=C.PROF_KEY_NONE): |
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244 """ Discovery method for the bridge |
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245 @param entity_jid_s: entity we want to discover |
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246 |
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247 @return: list of tu""" |
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248 entity = jid.JID(entity_jid_s) |
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249 disco_infos = yield self.getInfos(entity, profile_key) |
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250 defer.returnValue((disco_infos.features, [(cat, type_, name or '') for (cat, type_), name in disco_infos.identities.items()])) |
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251 |
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252 @defer.inlineCallbacks |
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253 def _discoItems(self, entity_jid_s, profile_key=C.PROF_KEY_NONE): |
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254 """ Discovery method for the bridge |
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255 @param entity_jid_s: entity we want to discover |
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256 |
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257 @return: list of tu""" |
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258 entity = jid.JID(entity_jid_s) |
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259 disco_items = yield self.getItems(entity, profile_key) |
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260 defer.returnValue([(item.entity.full(), item.nodeIdentifier or '', item.name or '') for item in disco_items]) |