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annotate src/plugins/plugin_xep_0300.py @ 2528:65e278997715

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component file sharing: comments metadata: new <comments> element is added to file metadata, it contains the URL to the comments virtual node and the count of comments (this way client knows if it make sense to request comments or not). Fixed triggers in plugin XEP-0264 (return value was missing). New trigger in plugin XEP-0329 to allow component to add metadata (used here for comments url).
author Goffi <goffi@goffi.org>
date Fri, 16 Mar 2018 18:43:11 +0100
parents 7ad5f2c4e34a
children
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rev   line source
1934
2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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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) 2009-2018 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 log = getLogger(__name__)
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24 from sat.core import exceptions
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25 from twisted.words.xish import domish
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26 from twisted.words.protocols.jabber.xmlstream import XMPPHandler
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27 from twisted.internet import threads
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28 from twisted.internet import defer
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29 from zope.interface import implements
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30 from wokkel import disco, iwokkel
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31 from collections import OrderedDict
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32 import hashlib
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33 import base64
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34
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35
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36 PLUGIN_INFO = {
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37 C.PI_NAME: "Cryptographic Hash Functions",
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38 C.PI_IMPORT_NAME: "XEP-0300",
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39 C.PI_TYPE: "XEP",
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40 C.PI_MODES: C.PLUG_MODE_BOTH,
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41 C.PI_PROTOCOLS: ["XEP-0300"],
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42 C.PI_MAIN: "XEP_0300",
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43 C.PI_HANDLER: "yes",
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44 C.PI_DESCRIPTION: _("""Management of cryptographic hashes""")
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45 }
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46
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47 NS_HASHES = "urn:xmpp:hashes:2"
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48 NS_HASHES_FUNCTIONS = u"urn:xmpp:hash-function-text-names:{}"
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49 BUFFER_SIZE = 2**12
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50 ALGO_DEFAULT = 'sha-256'
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51
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52
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53 class XEP_0300(object):
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54 # TODO: add blake after moving to Python 3
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55 ALGOS = OrderedDict((
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56 (u'md5', hashlib.md5),
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57 (u'sha-1', hashlib.sha1),
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58 (u'sha-256', hashlib.sha256),
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59 (u'sha-512', hashlib.sha512),
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60 ))
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61
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62 def __init__(self, host):
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63 log.info(_("plugin Hashes initialization"))
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64 host.registerNamespace('hashes', NS_HASHES)
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65
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66 def getHandler(self, client):
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67 return XEP_0300_handler()
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68
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69 def getHasher(self, algo=ALGO_DEFAULT):
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70 """Return hasher instance
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71
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72 @param algo(unicode): one of the XEP_300.ALGOS keys
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73 @return (hash object): same object s in hashlib.
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74 update method need to be called for each chunh
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75 diget or hexdigest can be used at the end
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76 """
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77 return self.ALGOS[algo]()
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78
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79 def getDefaultAlgo(self):
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80 return ALGO_DEFAULT
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81
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82 @defer.inlineCallbacks
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83 def getBestPeerAlgo(self, to_jid, profile):
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84 """Return the best available hashing algorith of other peer
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85
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86 @param to_jid(jid.JID): peer jid
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87 @parm profile: %(doc_profile)s
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88 @return (D(unicode, None)): best available algorithm,
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89 or None if hashing is not possible
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90 """
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91 client = self.host.getClient(profile)
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92 for algo in reversed(XEP_0300.ALGOS):
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93 has_feature = yield self.host.hasFeature(client, NS_HASHES_FUNCTIONS.format(algo), to_jid)
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94 if has_feature:
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95 log.debug(u"Best hashing algorithm found for {jid}: {algo}".format(
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96 jid=to_jid.full(),
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97 algo=algo))
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98 defer.returnValue(algo)
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99
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100 def _calculateHashBlocking(self, file_obj, hasher):
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101 """Calculate hash in a blocking way
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102
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103 /!\\ blocking method, please use calculateHash instead
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104 @param file_obj(file): a file-like object
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105 @param hasher(callable): the method to call to initialise hash object
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106 @return (str): the hex digest of the hash
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107 """
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108 hash_ = hasher()
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109 while True:
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110 buf = file_obj.read(BUFFER_SIZE)
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111 if not buf:
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112 break
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113 hash_.update(buf)
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114 return hash_.hexdigest()
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115
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116 def calculateHash(self, file_obj, hasher):
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117 return threads.deferToThread(self._calculateHashBlocking, file_obj, hasher)
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118
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119 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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120 """Compute hash and build hash element
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121
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122 @param file_obj(file, None): file-like object to use to calculate the hash
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123 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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124 @return (D(domish.Element)): hash element
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parents: 1526
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125 """
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126 def hashCalculated(hash_):
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127 return self.buildHashElt(hash_, algo)
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128 hasher = self.ALGOS[algo]
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129 hash_d = self.calculateHash(file_obj, hasher)
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130 hash_d.addCallback(hashCalculated)
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131 return hash_d
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132
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133 def buildHashUsedElt(self, algo=ALGO_DEFAULT):
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134 hash_used_elt = domish.Element((NS_HASHES, 'hash-used'))
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135 hash_used_elt['algo'] = algo
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136 return hash_used_elt
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137
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138 def parseHashUsedElt(self, parent):
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139 """Find and parse a hash-used element
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140
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141 @param (domish.Element): parent of <hash/> element
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142 @return (unicode): hash algorithm used
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143 @raise exceptions.NotFound: the element is not present
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144 @raise exceptions.DataError: the element is invalid
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145 """
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146 try:
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147 hash_used_elt = next(parent.elements(NS_HASHES, 'hash-used'))
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148 except StopIteration:
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149 raise exceptions.NotFound
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150 algo = hash_used_elt[u'algo']
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151 if not algo:
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152 raise exceptions.DataError
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153 return algo
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154
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155 def buildHashElt(self, hash_, algo=ALGO_DEFAULT):
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156 """Compute hash and build hash element
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157
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158 @param hash_(str): hash to use
1526
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parents:
diff changeset
159 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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Goffi <goffi@goffi.org>
parents:
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160 @return (domish.Element): computed hash
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parents:
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161 """
2502
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162 assert hash_
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163 assert algo
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parents:
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164 hash_elt = domish.Element((NS_HASHES, 'hash'))
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165 if hash_ is not None:
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166 hash_elt.addContent(base64.b64encode(hash_))
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167 hash_elt['algo'] = algo
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168 return hash_elt
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169
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170 def parseHashElt(self, parent):
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171 """Find and parse a hash element
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172
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173 if multiple elements are found, the strongest managed one is returned
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parents: 1526
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174 @param (domish.Element): parent of <hash/> element
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Goffi <goffi@goffi.org>
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175 @return (tuple[unicode, str]): (algo, hash) tuple
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Goffi <goffi@goffi.org>
parents: 1526
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176 both values can be None if <hash/> is empty
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177 @raise exceptions.NotFound: the element is not present
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178 @raise exceptions.DataError: the element is invalid
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179 """
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parents: 1526
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180 algos = XEP_0300.ALGOS.keys()
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181 hash_elt = None
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182 best_algo = None
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183 best_value = None
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parents: 1526
diff changeset
184 for hash_elt in parent.elements(NS_HASHES, 'hash'):
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185 algo = hash_elt.getAttribute('algo')
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186 try:
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187 idx = algos.index(algo)
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188 except ValueError:
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189 log.warning(u"Proposed {} algorithm is not managed".format(algo))
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diff changeset
190 algo = None
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191 continue
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192
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diff changeset
193 if best_algo is None or algos.index(best_algo) < idx:
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194 best_algo = algo
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195 best_value = base64.b64decode(unicode(hash_elt))
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196
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diff changeset
197 if not hash_elt:
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198 raise exceptions.NotFound
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diff changeset
199 if not best_algo or not best_value:
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200 raise exceptions.DataError
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201 return best_algo, best_value
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202
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203
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204 class XEP_0300_handler(XMPPHandler):
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205 implements(iwokkel.IDisco)
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206
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diff changeset
207 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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Goffi <goffi@goffi.org>
parents: 1526
diff changeset
208 hash_functions_names = [disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo)) for algo in XEP_0300.ALGOS]
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parents: 1526
diff changeset
209 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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210
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diff changeset
211 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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212 return []