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annotate sat/plugins/plugin_xep_0300.py @ 3101:ab7e8ade848a

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plugin XEP-0045: added room statuses to metadata: room statuses are now sent with other metadata on bridge signals, and saved in Room instance. They give useful data on the room, for instance they can be used to know if a full jid is used in this room.
author Goffi <goffi@goffi.org>
date Mon, 30 Dec 2019 20:44:02 +0100
parents fee60f17ebac
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Hash functions (XEP-0300)
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5 # Copyright (C) 2009-2019 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.constants import Const as C
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22 from sat.core.log import getLogger
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23
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24 log = getLogger(__name__)
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25 from sat.core import exceptions
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26 from twisted.words.xish import domish
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27 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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28 from twisted.internet import threads
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29 from twisted.internet import defer
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30 from zope.interface import implementer
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31 from wokkel import disco, iwokkel
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32 from collections import OrderedDict
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33 import hashlib
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34 import base64
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36
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37 PLUGIN_INFO = {
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38 C.PI_NAME: "Cryptographic Hash Functions",
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39 C.PI_IMPORT_NAME: "XEP-0300",
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40 C.PI_TYPE: "XEP",
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41 C.PI_MODES: C.PLUG_MODE_BOTH,
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42 C.PI_PROTOCOLS: ["XEP-0300"],
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43 C.PI_MAIN: "XEP_0300",
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44 C.PI_HANDLER: "yes",
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45 C.PI_DESCRIPTION: _("""Management of cryptographic hashes"""),
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46 }
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47
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48 NS_HASHES = "urn:xmpp:hashes:2"
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49 NS_HASHES_FUNCTIONS = "urn:xmpp:hash-function-text-names:{}"
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50 BUFFER_SIZE = 2 ** 12
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51 ALGO_DEFAULT = "sha-256"
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52
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53
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54 class XEP_0300(object):
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55 # TODO: add blake after moving to Python 3
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56 ALGOS = OrderedDict(
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57 (
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58 ("md5", hashlib.md5),
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59 ("sha-1", hashlib.sha1),
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60 ("sha-256", hashlib.sha256),
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61 ("sha-512", hashlib.sha512),
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62 )
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63 )
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64
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65 def __init__(self, host):
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66 log.info(_("plugin Hashes initialization"))
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67 host.registerNamespace("hashes", NS_HASHES)
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68
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69 def getHandler(self, client):
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70 return XEP_0300_handler()
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71
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72 def getHasher(self, algo=ALGO_DEFAULT):
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73 """Return hasher instance
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74
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75 @param algo(unicode): one of the XEP_300.ALGOS keys
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76 @return (hash object): same object s in hashlib.
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77 update method need to be called for each chunh
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78 diget or hexdigest can be used at the end
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79 """
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80 return self.ALGOS[algo]()
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81
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82 def getDefaultAlgo(self):
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83 return ALGO_DEFAULT
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84
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85 @defer.inlineCallbacks
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86 def getBestPeerAlgo(self, to_jid, profile):
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87 """Return the best available hashing algorith of other peer
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88
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89 @param to_jid(jid.JID): peer jid
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90 @parm profile: %(doc_profile)s
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91 @return (D(unicode, None)): best available algorithm,
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92 or None if hashing is not possible
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93 """
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94 client = self.host.getClient(profile)
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95 for algo in reversed(XEP_0300.ALGOS):
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96 has_feature = yield self.host.hasFeature(
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97 client, NS_HASHES_FUNCTIONS.format(algo), to_jid
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98 )
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99 if has_feature:
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100 log.debug(
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101 "Best hashing algorithm found for {jid}: {algo}".format(
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102 jid=to_jid.full(), algo=algo
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103 )
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104 )
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105 defer.returnValue(algo)
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106
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107 def _calculateHashBlocking(self, file_obj, hasher):
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108 """Calculate hash in a blocking way
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109
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110 /!\\ blocking method, please use calculateHash instead
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111 @param file_obj(file): a file-like object
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112 @param hasher(callable): the method to call to initialise hash object
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113 @return (str): the hex digest of the hash
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114 """
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115 hash_ = hasher()
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116 while True:
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117 buf = file_obj.read(BUFFER_SIZE)
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118 if not buf:
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119 break
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120 hash_.update(buf)
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121 return hash_.hexdigest()
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122
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123 def calculateHash(self, file_obj, hasher):
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124 return threads.deferToThread(self._calculateHashBlocking, file_obj, hasher)
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125
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126 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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127 """Compute hash and build hash element
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128
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129 @param file_obj(file, None): file-like object to use to calculate the hash
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130 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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131 @return (D(domish.Element)): hash element
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132 """
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133
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134 def hashCalculated(hash_):
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135 return self.buildHashElt(hash_, algo)
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136
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137 hasher = self.ALGOS[algo]
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138 hash_d = self.calculateHash(file_obj, hasher)
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139 hash_d.addCallback(hashCalculated)
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140 return hash_d
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141
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142 def buildHashUsedElt(self, algo=ALGO_DEFAULT):
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143 hash_used_elt = domish.Element((NS_HASHES, "hash-used"))
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144 hash_used_elt["algo"] = algo
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145 return hash_used_elt
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146
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147 def parseHashUsedElt(self, parent):
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148 """Find and parse a hash-used element
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149
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150 @param (domish.Element): parent of <hash/> element
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151 @return (unicode): hash algorithm used
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152 @raise exceptions.NotFound: the element is not present
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153 @raise exceptions.DataError: the element is invalid
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154 """
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155 try:
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156 hash_used_elt = next(parent.elements(NS_HASHES, "hash-used"))
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157 except StopIteration:
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158 raise exceptions.NotFound
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159 algo = hash_used_elt["algo"]
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160 if not algo:
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161 raise exceptions.DataError
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162 return algo
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163
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164 def buildHashElt(self, hash_, algo=ALGO_DEFAULT):
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165 """Compute hash and build hash element
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166
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167 @param hash_(str): hash to use
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168 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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169 @return (domish.Element): computed hash
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170 """
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171 assert hash_
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172 assert algo
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173 hash_elt = domish.Element((NS_HASHES, "hash"))
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174 if hash_ is not None:
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175 b64_hash = base64.b64encode(hash_.encode('utf-8')).decode('utf-8')
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176 hash_elt.addContent(b64_hash)
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177 hash_elt["algo"] = algo
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178 return hash_elt
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179
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180 def parseHashElt(self, parent):
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181 """Find and parse a hash element
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182
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183 if multiple elements are found, the strongest managed one is returned
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184 @param (domish.Element): parent of <hash/> element
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185 @return (tuple[str, bytes]): (algo, hash) tuple
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186 both values can be None if <hash/> is empty
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187 @raise exceptions.NotFound: the element is not present
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188 @raise exceptions.DataError: the element is invalid
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189 """
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190 algos = list(XEP_0300.ALGOS.keys())
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191 hash_elt = None
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192 best_algo = None
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193 best_value = None
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194 for hash_elt in parent.elements(NS_HASHES, "hash"):
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195 algo = hash_elt.getAttribute("algo")
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196 try:
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197 idx = algos.index(algo)
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198 except ValueError:
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199 log.warning(f"Proposed {algo} algorithm is not managed")
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200 algo = None
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201 continue
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202
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203 if best_algo is None or algos.index(best_algo) < idx:
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204 best_algo = algo
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205 best_value = base64.b64decode(str(hash_elt)).decode('utf-8')
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206
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207 if not hash_elt:
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208 raise exceptions.NotFound
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209 if not best_algo or not best_value:
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210 raise exceptions.DataError
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211 return best_algo, best_value
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212
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213
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214 @implementer(iwokkel.IDisco)
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215 class XEP_0300_handler(XMPPHandler):
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216
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217 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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218 hash_functions_names = [
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219 disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo))
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220 for algo in XEP_0300.ALGOS
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221 ]
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222 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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223
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224 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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225 return []