Mercurial > libervia-backend
annotate libervia/backend/memory/disco.py @ 4335:430d5d99a740
plugin XEP-0358: "Publishing Available Jingle Sessions" implementation:
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author | Goffi <goffi@goffi.org> |
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date | Tue, 03 Dec 2024 00:13:07 +0100 |
parents | 554a87ae17a6 |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
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4 # Libervia XMPP client |
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5 # Copyright (C) 2009-2024 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 typing import Iterable, Optional, cast |
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21 |
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22 from twisted.internet.interfaces import IReactorCore |
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23 from libervia.backend.core.i18n import _ |
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24 from libervia.backend.core import exceptions |
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25 from libervia.backend.core.log import getLogger |
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26 from libervia.backend.core.core_types import SatXMPPEntity |
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27 |
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28 from twisted.words.protocols.jabber import jid |
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29 from twisted.words.protocols.jabber.error import StanzaError |
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30 from twisted.internet import defer |
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31 from twisted.internet import reactor |
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32 from twisted.python import failure |
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33 from libervia.backend.core.constants import Const as C |
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34 from libervia.backend.tools import xml_tools |
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35 from libervia.backend.memory import persistent |
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36 from wokkel import disco |
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37 from base64 import b64encode |
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38 from hashlib import sha1 |
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39 |
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40 |
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41 log = getLogger(__name__) |
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42 |
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43 |
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44 TIMEOUT = 15 |
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45 CAP_HASH_ERROR = "ERROR" |
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46 |
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47 |
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48 class HashGenerationError(Exception): |
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49 pass |
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50 |
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51 |
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52 class ByteIdentity(object): |
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53 """This class manage identity as bytes (needed for i;octet sort), it is used for the hash generation""" |
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54 |
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55 def __init__(self, identity, lang=None): |
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56 assert isinstance(identity, disco.DiscoIdentity) |
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57 self.category = identity.category.encode("utf-8") |
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58 self.idType = identity.type.encode("utf-8") |
3028 | 59 self.name = identity.name.encode("utf-8") if identity.name else b"" |
60 self.lang = lang.encode("utf-8") if lang is not None else b"" | |
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61 |
3028 | 62 def __bytes__(self): |
63 return b"%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name) | |
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64 |
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65 |
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66 class HashManager(object): |
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67 """map object which manage hashes |
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68 |
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69 persistent storage is update when a new hash is added |
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70 """ |
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71 |
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72 def __init__(self, persistent): |
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73 self.hashes = { |
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74 CAP_HASH_ERROR: disco.DiscoInfo() # used when we can't get disco infos |
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75 } |
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76 self.persistent = persistent |
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77 |
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78 def __getitem__(self, key): |
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79 return self.hashes[key] |
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80 |
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81 def __setitem__(self, hash_, disco_info): |
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82 if hash_ in self.hashes: |
3028 | 83 log.debug("ignoring hash set: it is already known") |
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84 return |
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85 self.hashes[hash_] = disco_info |
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86 self.persistent[hash_] = disco_info.toElement().toXml() |
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87 |
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88 def __contains__(self, hash_): |
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89 return self.hashes.__contains__(hash_) |
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90 |
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91 def load(self): |
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92 def fill_hashes(hashes): |
3028 | 93 for hash_, xml in hashes.items(): |
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94 element = xml_tools.ElementParser()(xml) |
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95 disco_info = disco.DiscoInfo.fromElement(element) |
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96 for ext_form in disco_info.extensions.values(): |
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97 # wokkel doesn't call typeCheck on reception, so we do it here |
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98 ext_form.typeCheck() |
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99 if not disco_info.features and not disco_info.identities: |
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100 log.warning( |
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101 _( |
3028 | 102 "no feature/identity found in disco element (hash: {cap_hash}), ignoring: {xml}" |
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103 ).format(cap_hash=hash_, xml=xml) |
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104 ) |
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105 else: |
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106 self.hashes[hash_] = disco_info |
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107 |
3028 | 108 log.info("Disco hashes loaded") |
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109 |
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110 d = self.persistent.load() |
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111 d.addCallback(fill_hashes) |
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112 return d |
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113 |
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114 |
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115 class Discovery(object): |
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116 """Manage capabilities of entities""" |
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117 |
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118 def __init__(self, host): |
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119 self.host = host |
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120 # TODO: remove legacy hashes |
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121 |
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122 def load(self): |
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123 """Load persistent hashes""" |
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124 self.hashes = HashManager(persistent.PersistentDict("disco")) |
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125 return self.hashes.load() |
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126 |
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127 async def has_feature( |
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128 self, |
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129 client: SatXMPPEntity, |
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130 feature: str, |
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131 jid_: jid.JID | None = None, |
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132 node: str = "", |
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133 ) -> bool: |
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134 """Tell if an entity has the required feature |
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135 |
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136 @param feature: feature namespace |
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137 @param jid_: jid of the target, or None for profile's server |
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138 @param node: optional node to use for disco request |
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139 @return: a Deferred which fire a boolean (True if feature is available) |
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140 """ |
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141 disco_infos = await self.get_infos(client, jid_, node) |
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142 return feature in disco_infos.features |
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143 |
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144 async def check_feature( |
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145 self, |
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146 client: SatXMPPEntity, |
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147 feature: str, |
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148 jid_: jid.JID | None = None, |
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149 node: str = "", |
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150 ) -> None: |
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151 """Like has_feature, but raise an exception is feature is not Found |
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152 |
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153 @param feature: feature namespace |
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154 @param jid_: jid of the target, or None for profile's server |
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155 @param node: optional node to use for disco request |
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156 |
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157 @raise: exceptions.FeatureNotFound |
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158 """ |
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159 disco_infos = await self.get_infos(client, jid_, node) |
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160 if not feature in disco_infos.features: |
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161 raise exceptions.FeatureNotFound() |
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162 |
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163 async def check_features( |
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164 self, |
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165 client: SatXMPPEntity, |
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166 features: Iterable[str], |
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167 jid_: jid.JID | None = None, |
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168 identity: tuple[str, str] | None = None, |
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169 node: str = "", |
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170 ) -> None: |
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171 """Like check_feature, but check several features at once, and check also identity |
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172 |
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173 @param features: features to check |
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174 @param jid_: jid of the target, or None for profile's server |
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175 @param node: optional node to use for disco request |
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176 @param identity: if not None, the entity must have an identity with this |
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177 (category, type) tuple |
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178 |
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179 @raise: exceptions.FeatureNotFound |
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180 """ |
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181 disco_infos = await self.get_infos(client, jid_, node) |
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182 if not set(features).issubset(disco_infos.features): |
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183 raise exceptions.FeatureNotFound() |
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184 |
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185 if identity is not None and identity not in disco_infos.identities: |
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186 raise exceptions.FeatureNotFound() |
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187 |
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188 async def has_identity( |
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189 self, |
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190 client: SatXMPPEntity, |
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191 category: str, |
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192 type_: str, |
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193 jid_: Optional[jid.JID] = None, |
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194 node: str = "", |
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195 ) -> bool: |
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196 """Tell if an entity has the requested identity |
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197 |
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198 @param category: identity category |
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199 @param type_: identity type |
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200 @param jid_: jid of the target, or None for profile's server |
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201 @param node(unicode): optional node to use for disco request |
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202 @return: True if the entity has the given identity |
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203 """ |
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204 disco_infos = await self.get_infos(client, jid_, node) |
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205 return (category, type_) in disco_infos.identities |
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206 |
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207 def get_infos(self, client, jid_=None, node="", use_cache=True): |
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208 """get disco infos from jid_, filling capability hash if needed |
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209 |
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210 @param jid_: jid of the target, or None for profile's server |
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211 @param node(unicode): optional node to use for disco request |
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212 @param use_cache(bool): if True, use cached data if available |
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213 @return: a Deferred which fire disco.DiscoInfo |
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214 """ |
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215 if jid_ is None: |
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216 jid_ = jid.JID(client.jid.host) |
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217 try: |
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218 if not use_cache: |
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219 # we ignore cache, so we pretend we haven't found it |
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220 raise KeyError |
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221 cap_hash = self.host.memory.entity_data_get( |
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222 client, jid_, [C.ENTITY_CAP_HASH] |
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223 )[C.ENTITY_CAP_HASH] |
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224 except (KeyError, exceptions.UnknownEntityError): |
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225 # capability hash is not available, we'll compute one |
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226 def infos_cb(disco_infos): |
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227 cap_hash = self.generate_hash(disco_infos) |
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228 for ext_form in disco_infos.extensions.values(): |
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229 # wokkel doesn't call typeCheck on reception, so we do it here |
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230 # to avoid ending up with incorrect types. We have to do it after |
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231 # the hash has been generated (str value is needed to compute the |
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232 # hash) |
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233 ext_form.typeCheck() |
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234 self.hashes[cap_hash] = disco_infos |
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235 self.host.memory.update_entity_data( |
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236 client, jid_, C.ENTITY_CAP_HASH, cap_hash |
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237 ) |
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238 return disco_infos |
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239 |
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240 def infos_eb(fail): |
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241 if fail.check(defer.CancelledError): |
3028 | 242 reason = "request time-out" |
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243 fail = failure.Failure(exceptions.TimeOutError(str(fail.value))) |
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244 else: |
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245 try: |
3028 | 246 reason = str(fail.value) |
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247 except AttributeError: |
3028 | 248 reason = str(fail) |
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249 |
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250 log.warning( |
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251 "can't request disco infos from {jid}: {reason}".format( |
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252 jid=jid_.full(), reason=reason |
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253 ) |
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254 ) |
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255 |
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256 # XXX we set empty disco in cache, to avoid getting an error or waiting |
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257 # for a timeout again the next time |
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258 self.host.memory.update_entity_data( |
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259 client, jid_, C.ENTITY_CAP_HASH, CAP_HASH_ERROR |
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260 ) |
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261 raise fail |
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262 |
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263 d = client.disco.requestInfo(jid_, nodeIdentifier=node) |
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264 d.addCallback(infos_cb) |
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265 d.addErrback(infos_eb) |
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266 return d |
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267 else: |
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268 disco_infos = self.hashes[cap_hash] |
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269 return defer.succeed(disco_infos) |
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270 |
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271 @defer.inlineCallbacks |
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272 def get_items(self, client, jid_=None, node="", use_cache=True): |
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273 """get disco items from jid_, cache them for our own server |
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274 |
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275 @param jid_(jid.JID): jid of the target, or None for profile's server |
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276 @param node(unicode): optional node to use for disco request |
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277 @param use_cache(bool): if True, use cached data if available |
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278 @return: a Deferred which fire disco.DiscoItems |
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279 """ |
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280 if jid_ is None: |
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281 jid_ = client.server_jid |
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282 |
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283 if jid_ == client.server_jid and not node: |
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284 # we cache items only for our own server and if node is not set |
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285 try: |
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286 items = self.host.memory.entity_data_get(client, jid_, ["DISCO_ITEMS"])[ |
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287 "DISCO_ITEMS" |
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288 ] |
3028 | 289 log.debug("[%s] disco items are in cache" % jid_.full()) |
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290 if not use_cache: |
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291 # we ignore cache, so we pretend we haven't found it |
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292 raise KeyError |
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293 except (KeyError, exceptions.UnknownEntityError): |
3028 | 294 log.debug("Caching [%s] disco items" % jid_.full()) |
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295 items = yield client.disco.requestItems(jid_, nodeIdentifier=node) |
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296 self.host.memory.update_entity_data(client, jid_, "DISCO_ITEMS", items) |
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297 else: |
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298 try: |
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299 items = yield client.disco.requestItems(jid_, nodeIdentifier=node) |
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300 except StanzaError as e: |
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301 log.warning( |
3028 | 302 "Error while requesting items for {jid}: {reason}".format( |
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303 jid=jid_.full(), reason=e.condition |
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304 ) |
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305 ) |
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306 items = disco.DiscoItems() |
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307 |
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308 defer.returnValue(items) |
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309 |
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310 def _infos_eb(self, failure_, entity_jid): |
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311 failure_.trap(StanzaError) |
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312 log.warning( |
3028 | 313 _("Error while requesting [%(jid)s]: %(error)s") |
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314 % {"jid": entity_jid.full(), "error": failure_.getErrorMessage()} |
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315 ) |
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316 |
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317 def find_service_entity(self, client, category, type_, jid_=None): |
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318 """Helper method to find first available entity from find_service_entities |
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319 |
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320 args are the same as for [find_service_entities] |
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321 @return (jid.JID, None): found entity |
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322 """ |
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323 d = self.host.find_service_entities(client, category, type_) |
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324 d.addCallback(lambda entities: entities.pop() if entities else None) |
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325 return d |
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326 |
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327 def find_service_entities(self, client, category, type_, jid_=None): |
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328 """Return all available items of an entity which correspond to (category, type_) |
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329 |
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330 @param category: identity's category |
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331 @param type_: identitiy's type |
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332 @param jid_: the jid of the target server (None for profile's server) |
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333 @return: a set of found entities |
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334 @raise defer.CancelledError: the request timed out |
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335 """ |
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336 found_entities = set() |
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337 |
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338 def infos_cb(infos, entity_jid): |
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339 if (category, type_) in infos.identities: |
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340 found_entities.add(entity_jid) |
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341 |
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342 def got_items(items): |
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343 defers_list = [] |
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344 for item in items: |
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345 info_d = self.get_infos(client, item.entity) |
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346 info_d.addCallbacks( |
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347 infos_cb, self._infos_eb, [item.entity], None, [item.entity] |
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348 ) |
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349 defers_list.append(info_d) |
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350 return defer.DeferredList(defers_list) |
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351 |
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352 d = self.get_items(client, jid_) |
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353 d.addCallback(got_items) |
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354 d.addCallback(lambda __: found_entities) |
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355 reactor.callLater( |
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356 TIMEOUT, d.cancel |
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357 ) # FIXME: one bad service make a general timeout |
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358 return d |
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359 |
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360 async def find_features_set( |
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361 self, |
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362 client: SatXMPPEntity, |
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363 features: Iterable[str], |
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364 identity: tuple[str, str] | None = None, |
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365 jid_: jid.JID | None = None, |
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366 ) -> set[jid.JID]: |
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367 """Return entities (including jid_ and its items) offering features |
587
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368 |
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369 @param client: Client session. |
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370 @param features: iterable of features which must be present |
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371 @param identity: if not None, accept only this (category/type) identity |
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372 @param jid_: the jid of the target server (None for profile's server) |
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373 @return: a set of found entities |
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374 """ |
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375 if jid_ is None: |
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376 jid_ = jid.JID(client.jid.host) |
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377 features = set(features) |
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378 found_entities = set() |
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379 |
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380 def infos_cb(infos: disco.DiscoInfo, entity: jid.JID) -> None: |
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381 if entity is None: |
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382 log.warning(_("Received an item without JID")) |
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383 return |
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|
384 if identity is not None and identity not in infos.identities: |
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|
385 return |
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386 if features.issubset(infos.features): |
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387 found_entities.add(entity) |
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388 |
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389 items = await self.get_items(client, jid_) |
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390 defer_list = [] |
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391 for entity in [jid_] + [item.entity for item in items]: |
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392 infos_d = self.get_infos(client, entity) |
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|
393 infos_d.addCallbacks(infos_cb, self._infos_eb, [entity], None, [entity]) |
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394 infos_d.addTimeout(TIMEOUT, cast(IReactorCore, reactor)) |
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|
395 defer_list.append(infos_d) |
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396 await defer.DeferredList(defer_list) |
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397 return found_entities |
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398 |
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399 def generate_hash(self, services): |
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400 """Generate a unique hash for given service |
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401 |
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402 hash algorithm is the one described in XEP-0115 |
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|
403 @param services: iterable of disco.DiscoIdentity/disco.DiscoFeature, as returned by discoHandler.info |
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|
404 |
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|
405 """ |
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406 s = [] |
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407 # identities |
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408 byte_identities = [ |
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|
409 ByteIdentity(service) |
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410 for service in services |
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411 if isinstance(service, disco.DiscoIdentity) |
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|
412 ] # FIXME: lang must be managed here |
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|
413 byte_identities.sort(key=lambda i: i.lang) |
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|
414 byte_identities.sort(key=lambda i: i.idType) |
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|
415 byte_identities.sort(key=lambda i: i.category) |
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|
416 for identity in byte_identities: |
3028 | 417 s.append(bytes(identity)) |
418 s.append(b"<") | |
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|
419 # features |
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420 byte_features = [ |
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|
421 service.encode("utf-8") |
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422 for service in services |
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423 if isinstance(service, disco.DiscoFeature) |
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|
424 ] |
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|
425 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort |
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|
426 for feature in byte_features: |
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|
427 s.append(feature) |
3028 | 428 s.append(b"<") |
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|
429 |
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|
430 # extensions |
3028 | 431 ext = list(services.extensions.values()) |
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432 ext.sort(key=lambda f: f.formNamespace.encode("utf-8")) |
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|
433 for extension in ext: |
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|
434 s.append(extension.formNamespace.encode("utf-8")) |
3028 | 435 s.append(b"<") |
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|
436 fields = extension.fieldList |
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|
437 fields.sort(key=lambda f: f.var.encode("utf-8")) |
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|
438 for field in fields: |
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|
439 s.append(field.var.encode("utf-8")) |
3028 | 440 s.append(b"<") |
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|
441 values = [v.encode("utf-8") for v in field.values] |
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|
442 values.sort() |
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|
443 for value in values: |
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|
444 s.append(value) |
3028 | 445 s.append(b"<") |
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446 |
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447 cap_hash = b64encode(sha1(b"".join(s)).digest()).decode("utf-8") |
3028 | 448 log.debug(_("Capability hash generated: [{cap_hash}]").format(cap_hash=cap_hash)) |
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449 return cap_hash |
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450 |
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451 @defer.inlineCallbacks |
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452 def _disco_infos( |
3028 | 453 self, entity_jid_s, node="", use_cache=True, profile_key=C.PROF_KEY_NONE |
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454 ): |
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455 """Discovery method for the bridge |
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456 @param entity_jid_s: entity we want to discover |
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457 @param use_cache(bool): if True, use cached data if available |
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458 @param node(unicode): optional node to use |
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459 |
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460 @return: list of tuples |
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461 """ |
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462 client = self.host.get_client(profile_key) |
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463 entity = jid.JID(entity_jid_s) |
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464 disco_infos = yield self.get_infos(client, entity, node, use_cache) |
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465 extensions = {} |
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466 # FIXME: should extensions be serialised using tools.common.data_format? |
3028 | 467 for form_type, form in list(disco_infos.extensions.items()): |
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468 fields = [] |
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469 for field in form.fieldList: |
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470 data = {"type": field.fieldType} |
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471 for attr in ("var", "label", "desc"): |
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472 value = getattr(field, attr) |
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473 if value is not None: |
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474 data[attr] = value |
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475 |
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476 values = [field.value] if field.value is not None else field.values |
3028 | 477 if field.fieldType == "boolean": |
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478 values = [C.bool_const(v) for v in values] |
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479 fields.append((data, values)) |
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480 |
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481 extensions[form_type or ""] = fields |
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482 |
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483 defer.returnValue( |
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484 ( |
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485 [str(f) for f in disco_infos.features], |
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486 [ |
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487 (cat, type_, name or "") |
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488 for (cat, type_), name in list(disco_infos.identities.items()) |
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489 ], |
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490 extensions, |
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491 ) |
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492 ) |
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493 |
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494 def items2tuples(self, disco_items): |
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495 """convert disco items to tuple of strings |
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496 |
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497 @param disco_items(iterable[disco.DiscoItem]): items |
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498 @return G(tuple[unicode,unicode,unicode]): serialised items |
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499 """ |
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500 for item in disco_items: |
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501 if not item.entity: |
3028 | 502 log.warning(_("invalid item (no jid)")) |
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503 continue |
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504 yield (item.entity.full(), item.nodeIdentifier or "", item.name or "") |
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505 |
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506 @defer.inlineCallbacks |
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507 def _disco_items( |
3028 | 508 self, entity_jid_s, node="", use_cache=True, profile_key=C.PROF_KEY_NONE |
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509 ): |
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510 """Discovery method for the bridge |
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511 |
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512 @param entity_jid_s: entity we want to discover |
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513 @param node(unicode): optional node to use |
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514 @param use_cache(bool): if True, use cached data if available |
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515 @return: list of tuples""" |
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516 client = self.host.get_client(profile_key) |
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517 entity = jid.JID(entity_jid_s) |
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518 disco_items = yield self.get_items(client, entity, node, use_cache) |
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519 ret = list(self.items2tuples(disco_items)) |
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520 defer.returnValue(ret) |