Mercurial > libervia-backend
annotate src/plugins/plugin_xep_0300.py @ 1727:68e498b3367e
reverted revision 2ebe66a96d05
author | souliane <souliane@mailoo.org> |
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date | Tue, 08 Dec 2015 16:55:54 +0100 |
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1 #!/usr/bin/python |
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2 # -*- coding: utf-8 -*- |
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3 |
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4 # SAT plugin for Hash functions (XEP-0300) |
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015 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.log import getLogger |
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22 log = getLogger(__name__) |
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23 from sat.core import exceptions |
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24 from twisted.words.xish import domish |
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25 from twisted.words.protocols.jabber.xmlstream import XMPPHandler |
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26 from twisted.internet import threads |
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27 from twisted.internet import defer |
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28 from zope.interface import implements |
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29 from wokkel import disco, iwokkel |
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30 from collections import OrderedDict |
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31 import hashlib |
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32 |
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33 |
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34 PLUGIN_INFO = { |
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35 "name": "Cryptographic Hash Functions", |
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36 "import_name": "XEP-0300", |
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37 "type": "XEP", |
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38 "protocols": ["XEP-0300"], |
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39 "main": "XEP_0300", |
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40 "handler": "yes", |
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41 "description": _("""Management of cryptographic hashes""") |
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42 } |
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43 |
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44 NS_HASHES = "urn:xmpp:hashes:1" |
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45 NS_HASHES_FUNCTIONS = u"urn:xmpp:hash-function-text-names:{}" |
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46 BUFFER_SIZE = 2**12 |
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47 ALGO_DEFAULT = 'sha-256' |
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48 |
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49 |
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50 class XEP_0300(object): |
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51 ALGOS = OrderedDict(( |
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52 (u'md5', hashlib.md5), |
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53 (u'sha-1', hashlib.sha1), |
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54 (u'sha-256', hashlib.sha256), |
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55 (u'sha-512', hashlib.sha512), |
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56 )) |
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57 |
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58 def __init__(self, host): |
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59 log.info(_("plugin Hashes initialization")) |
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60 |
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61 def getHandler(self, profile): |
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62 return XEP_0300_handler() |
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63 |
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64 def getHasher(self, algo): |
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65 """Return hasher instance |
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66 |
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67 /!\\ blocking method, considere using calculateHashElt |
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68 if you want to hash a big file |
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69 @param algo(unicode): one of the XEP_300.ALGOS keys |
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70 @return (hash object): same object s in hashlib. |
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71 update method need to be called for each chunh |
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72 diget or hexdigest can be used at the end |
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73 """ |
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74 return self.ALGOS[algo]() |
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75 |
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76 @defer.inlineCallbacks |
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77 def getBestPeerAlgo(self, to_jid, profile): |
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78 """Return the best available hashing algorith of other peer |
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79 |
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80 @param to_jid(jid.JID): peer jid |
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81 @parm profile: %(doc_profile)s |
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82 @return (D(unicode, None)): best available algorithm, |
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83 or None if hashing is not possible |
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84 """ |
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85 for algo in reversed(XEP_0300.ALGOS): |
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86 has_feature = yield self.host.hasFeature(NS_HASHES_FUNCTIONS.format(algo), to_jid, profile) |
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87 if has_feature: |
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88 log.debug(u"Best hashing algorithm found for {jid}: {algo}".format( |
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89 jid=to_jid.full(), |
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90 algo=algo)) |
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91 defer.returnValue(algo) |
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92 |
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93 def calculateHashBlocking(self, file_obj, hasher): |
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94 """Calculate hash in a blocking way |
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95 |
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96 @param file_obj(file): a file-like object |
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97 @param hasher(callable): the method to call to initialise hash object |
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98 @return (str): the hex digest of the hash |
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99 """ |
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100 hash_ = hasher() |
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101 while True: |
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102 buf = file_obj.read(BUFFER_SIZE) |
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103 if not buf: |
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104 break |
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105 hash_.update(buf) |
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106 return hash_.hexdigest() |
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107 |
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108 def calculateHashElt(self, file_obj=None, algo=ALGO_DEFAULT): |
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109 """Compute hash and build hash element |
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110 |
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111 @param file_obj(file, None): file-like object to use to calculate the hash |
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112 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS |
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113 @return (D(domish.Element)): hash element |
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114 """ |
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115 def hashCalculated(hash_): |
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116 return self.buildHashElt(hash_, algo) |
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117 hasher = self.ALGOS[algo] |
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118 hash_d = threads.deferToThread(self.calculateHashBlocking, file_obj, hasher) |
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119 hash_d.addCallback(hashCalculated) |
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120 return hash_d |
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121 |
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122 def buildHashElt(self, hash_=None, algo=ALGO_DEFAULT): |
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123 """Compute hash and build hash element |
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124 |
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125 @param hash_(None, str): hash to use, or None for an empty element |
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126 @param algo(unicode): algorithme to use, must be a key of XEP_0300.ALGOS |
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127 @return (domish.Element): computed hash |
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128 """ |
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129 hash_elt = domish.Element((NS_HASHES, 'hash')) |
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130 if hash_ is not None: |
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131 hash_elt.addContent(hash_) |
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132 hash_elt['algo']=algo |
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133 return hash_elt |
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134 |
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135 def parseHashElt(self, parent): |
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136 """Find and parse a hash element |
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137 |
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138 if multiple elements are found, the strongest managed one is returned |
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139 @param (domish.Element): parent of <hash/> element |
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140 @return (tuple[unicode, str]): (algo, hash) tuple |
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141 both values can be None if <hash/> is empty |
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142 @raise exceptions.NotFound: the element is not present |
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143 """ |
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144 algos = XEP_0300.ALGOS.keys() |
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145 hash_elt = None |
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146 best_algo = None |
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147 best_value = None |
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148 for hash_elt in parent.elements(NS_HASHES, 'hash'): |
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149 algo = hash_elt.getAttribute('algo') |
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150 try: |
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151 idx = algos.index(algo) |
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152 except ValueError: |
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153 log.warning(u"Proposed {} algorithm is not managed".format(algo)) |
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154 algo = None |
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155 continue |
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156 |
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157 if best_algo is None or algos.index(best_algo) < idx: |
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158 best_algo = algo |
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159 best_value = str(hash_elt) or None |
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160 |
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161 if not hash_elt: |
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162 raise exceptions.NotFound |
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163 return best_algo, best_value |
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164 |
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165 |
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166 class XEP_0300_handler(XMPPHandler): |
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167 implements(iwokkel.IDisco) |
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168 |
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169 def getDiscoInfo(self, requestor, target, nodeIdentifier=''): |
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170 hash_functions_names = [disco.DiscoFeature(NS_HASHES_FUNCTIONS.format(algo)) for algo in XEP_0300.ALGOS] |
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171 return [disco.DiscoFeature(NS_HASHES)] + hash_functions_names |
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172 |
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173 def getDiscoItems(self, requestor, target, nodeIdentifier=''): |
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174 return [] |