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annotate src/plugins/plugin_xep_0300.py @ 2147:bca699faf416

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core: added release name in constants + full version
author Goffi <goffi@goffi.org>
date Sun, 12 Feb 2017 19:23:34 +0100
parents 33c8c4973743
children a543eda2c923
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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d17772b0fe22 copyright update
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5 # Copyright (C) 2009-2016 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
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34
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35 PLUGIN_INFO = {
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36 C.PI_NAME: "Cryptographic Hash Functions",
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37 C.PI_IMPORT_NAME: "XEP-0300",
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38 C.PI_TYPE: "XEP",
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39 C.PI_PROTOCOLS: ["XEP-0300"],
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40 C.PI_MAIN: "XEP_0300",
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41 C.PI_HANDLER: "yes",
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42 C.PI_DESCRIPTION: _("""Management of cryptographic hashes""")
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43 }
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44
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45 NS_HASHES = "urn:xmpp:hashes:1"
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46 NS_HASHES_FUNCTIONS = u"urn:xmpp:hash-function-text-names:{}"
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47 BUFFER_SIZE = 2**12
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48 ALGO_DEFAULT = 'sha-256'
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49
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50
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51 class XEP_0300(object):
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52 ALGOS = OrderedDict((
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53 (u'md5', hashlib.md5),
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54 (u'sha-1', hashlib.sha1),
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55 (u'sha-256', hashlib.sha256),
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56 (u'sha-512', hashlib.sha512),
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57 ))
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58
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59 def __init__(self, host):
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60 log.info(_("plugin Hashes initialization"))
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61
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62 def getHandler(self, client):
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63 return XEP_0300_handler()
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64
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65 def getHasher(self, algo):
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66 """Return hasher instance
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67
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68 /!\\ blocking method, considere using calculateHashElt
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69 if you want to hash a big file
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70 @param algo(unicode): one of the XEP_300.ALGOS keys
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71 @return (hash object): same object s in hashlib.
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72 update method need to be called for each chunh
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73 diget or hexdigest can be used at the end
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74 """
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75 return self.ALGOS[algo]()
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76
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77 @defer.inlineCallbacks
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78 def getBestPeerAlgo(self, to_jid, profile):
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79 """Return the best available hashing algorith of other peer
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80
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81 @param to_jid(jid.JID): peer jid
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82 @parm profile: %(doc_profile)s
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83 @return (D(unicode, None)): best available algorithm,
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84 or None if hashing is not possible
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85 """
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86 for algo in reversed(XEP_0300.ALGOS):
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87 has_feature = yield self.host.hasFeature(NS_HASHES_FUNCTIONS.format(algo), to_jid, profile)
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88 if has_feature:
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89 log.debug(u"Best hashing algorithm found for {jid}: {algo}".format(
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90 jid=to_jid.full(),
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91 algo=algo))
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92 defer.returnValue(algo)
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93
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94 def calculateHashBlocking(self, file_obj, hasher):
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95 """Calculate hash in a blocking way
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96
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97 @param file_obj(file): a file-like object
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98 @param hasher(callable): the method to call to initialise hash object
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99 @return (str): the hex digest of the hash
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100 """
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101 hash_ = hasher()
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102 while True:
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103 buf = file_obj.read(BUFFER_SIZE)
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104 if not buf:
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105 break
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106 hash_.update(buf)
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107 return hash_.hexdigest()
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108
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109 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT):
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110 """Compute hash and build hash element
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111
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112 @param file_obj(file, None): file-like object to use to calculate the hash
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113 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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114 @return (D(domish.Element)): hash element
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115 """
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116 def hashCalculated(hash_):
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117 return self.buildHashElt(hash_, algo)
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118 hasher = self.ALGOS[algo]
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119 hash_d = threads.deferToThread(self.calculateHashBlocking, file_obj, hasher)
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120 hash_d.addCallback(hashCalculated)
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121 return hash_d
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122
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123 def buildHashElt(self, hash_=None, algo=ALGO_DEFAULT):
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124 """Compute hash and build hash element
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125
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126 @param hash_(None, str): hash to use, or None for an empty element
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127 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS
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128 @return (domish.Element): computed hash
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129 """
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130 hash_elt = domish.Element((NS_HASHES, 'hash'))
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131 if hash_ is not None:
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132 hash_elt.addContent(hash_)
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133 hash_elt['algo']=algo
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134 return hash_elt
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135
1618
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Goffi <goffi@goffi.org>
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136 def parseHashElt(self, parent):
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137 """Find and parse a hash element
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138
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139 if multiple elements are found, the strongest managed one is returned
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140 @param (domish.Element): parent of <hash/> element
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141 @return (tuple[unicode, str]): (algo, hash) tuple
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142 both values can be None if <hash/> is empty
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143 @raise exceptions.NotFound: the element is not present
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144 """
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145 algos = XEP_0300.ALGOS.keys()
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146 hash_elt = None
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Goffi <goffi@goffi.org>
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147 best_algo = None
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148 best_value = None
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149 for hash_elt in parent.elements(NS_HASHES, 'hash'):
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150 algo = hash_elt.getAttribute('algo')
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151 try:
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152 idx = algos.index(algo)
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153 except ValueError:
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154 log.warning(u"Proposed {} algorithm is not managed".format(algo))
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155 algo = None
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156 continue
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157
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158 if best_algo is None or algos.index(best_algo) < idx:
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159 best_algo = algo
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160 best_value = str(hash_elt) or None
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161
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162 if not hash_elt:
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163 raise exceptions.NotFound
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164 return best_algo, best_value
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165
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166
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167 class XEP_0300_handler(XMPPHandler):
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168 implements(iwokkel.IDisco)
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169
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170 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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171 hash_functions_names = [disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo)) for algo in XEP_0300.ALGOS]
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172 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names
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173
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174 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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175 return []