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annotate src/plugins/plugin_xep_0231.py @ 2511:20a5e7db0609

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plugin XEP-0231: separated the requestData code in a method which can called independantly + some minor improvments
author Goffi <goffi@goffi.org>
date Fri, 02 Mar 2018 17:45:23 +0100
parents 0046283a285d
children 95c31756944c
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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 Jingle File Transfer (XEP-0231)
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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 import exceptions
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23 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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25 from sat.tools import xml_tools
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26 from wokkel import disco, iwokkel
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27 from zope.interface import implements
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28 from twisted.python import failure
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29 from twisted.words.protocols.jabber import xmlstream
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30 from twisted.words.protocols.jabber import jid
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31 from functools import partial
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32 import base64
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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: "Bits of Binary",
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37 C.PI_IMPORT_NAME: "XEP-0231",
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38 C.PI_TYPE: "XEP",
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39 C.PI_PROTOCOLS: ["XEP-0231"],
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40 C.PI_DEPENDENCIES: ["XEP-0071"],
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41 C.PI_MAIN: "XEP_0231",
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42 C.PI_HANDLER: "yes",
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43 C.PI_DESCRIPTION: _("""Implementation of bits of binary (used for small images/files)""")
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44 }
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45
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46 NS_BOB = u'urn:xmpp:bob'
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47
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48
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49 class XEP_0231(object):
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50
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51 def __init__(self, host):
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52 log.info(_(u"plugin Bits of Binary initialization"))
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53 self.host = host
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54 host.trigger.add("xhtml_post_treat", self.XHTMLTrigger)
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55
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56 def dumpData(self, cache, data_elt, cid):
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57 """save file encoded in data_elt to cache
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58
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59 @param cache(memory.cache.Cache): cache to use to store the data
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60 @param data_elt(domish.Element): <data> as in XEP-0231
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61 @param cid(unicode): content-id
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62 @return(unicode): full path to dumped file
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63 """
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64 # FIXME: is it needed to use a separate thread?
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65 # probably not with the little data expected with BoB
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66 try:
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67 max_age = int(data_elt['max-age'])
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68 if max_age < 0:
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69 raise ValueError
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70 except (KeyError, ValueError):
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71 log.warning(u'invalid max-age found')
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72 max_age = None
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73
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74 with cache.cacheData(
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75 PLUGIN_INFO[C.PI_IMPORT_NAME],
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76 cid,
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77 data_elt.getAttribute('type'),
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78 max_age) as f:
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79
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80 file_path = f.name
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81 f.write(base64.b64decode(str(data_elt)))
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82
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83 return file_path
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84
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85 def getHandler(self, client):
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86 return XEP_0231_handler()
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87
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88 def _requestCb(self, iq_elt, cache, cid):
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89 for data_elt in iq_elt.elements(NS_BOB, u'data'):
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90 if data_elt.getAttribute('cid') == cid:
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91 file_path = self.dumpData(cache, data_elt, cid)
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92 return file_path
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93
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94 log.warning(u"invalid data stanza received, requested cid was not found:\n{iq_elt}\nrequested cid: {cid}".format(
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95 iq_elt = iq_elt,
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96 cid = cid
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97 ))
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98 raise failure.Failure(exceptions.DataError("missing data"))
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99
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100 def _requestEb(self, failure_):
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101 """Log the error and continue errback chain"""
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102 log.warning(u"Can't get requested data:\n{reason}".format(reason=failure_))
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103 return failure_
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104
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105 def requestData(self, client, to_jid, cid, cache=None):
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106 """Request data if we don't have it in cache
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107
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108 @param to_jid(jid.JID): jid to request the data to
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109 @param cid(unicode): content id
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110 @param cache(memory.cache.Cache, None): cache to use
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111 client.cache will be used if None
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112 """
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113 if cache is None:
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114 cache = client.cache
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115 iq_elt = client.IQ('get')
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116 iq_elt['to'] = to_jid.full()
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117 data_elt = iq_elt.addElement((NS_BOB, 'data'))
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118 data_elt['cid'] = cid
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119 d = iq_elt.send()
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120 d.addCallback(self._requestCb, cache, cid)
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121 d.addErrback(self._requestEb)
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122
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123 def _setImgEltSrc(self, path, img_elt):
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124 img_elt[u'src'] = u'file://{}'.format(path)
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125
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126 def XHTMLTrigger(self, client, message_elt, body_elt, lang, treat_d):
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127 for img_elt in xml_tools.findAll(body_elt, C.NS_XHTML, u'img'):
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128 source = img_elt.getAttribute(u'src','')
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129 if source.startswith(u'cid:'):
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130 cid = source[4:]
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131 file_path = client.cache.getFilePath(cid)
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132 if file_path is not None:
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133 # image is in cache, we change change the url
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134 img_elt[u'src'] = u'file://{}'.format(file_path)
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135 continue
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136 else:
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137 # image is not in cache, is it given locally?
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138 for data_elt in message_elt.elements(NS_BOB, u'data'):
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139 if data_elt.getAttribute('cid') == cid:
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140 file_path = self.dumpData(client.cache, data_elt, cid)
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141 img_elt[u'src'] = u'file://{}'.format(file_path)
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142 break
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143 else:
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144 # cid not found locally, we need to request it
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145 # so we use the deferred
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146 d = self.requestData(client, jid.JID(message_elt['from']), cid)
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147 d.addCallback(partial(self._setImgEltSrc, img_elt=img_elt))
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148 treat_d.addCallback(lambda dummy: d)
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149
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150
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151 class XEP_0231_handler(xmlstream.XMPPHandler):
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152 implements(iwokkel.IDisco)
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153
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154 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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155 return [disco.DiscoFeature(NS_BOB)]
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156
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157 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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158 return []