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annotate sat/plugins/plugin_xep_0231.py @ 2624:56f94936df1e

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author Goffi <goffi@goffi.org>
date Wed, 27 Jun 2018 20:14:46 +0200
parents 26edcf3a30eb
children 378188abe941
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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 Bit of Binary handling (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
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25 log = getLogger(__name__)
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26 from sat.tools import xml_tools
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27 from wokkel import disco, iwokkel
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28 from zope.interface import implements
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29 from twisted.python import failure
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30 from twisted.words.protocols.jabber import xmlstream
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31 from twisted.words.protocols.jabber import jid
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32 from twisted.words.protocols.jabber import error as jabber_error
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33 from twisted.internet import defer
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34 from functools import partial
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35 import base64
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36 import time
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38
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39 PLUGIN_INFO = {
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40 C.PI_NAME: "Bits of Binary",
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41 C.PI_IMPORT_NAME: "XEP-0231",
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42 C.PI_TYPE: "XEP",
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43 C.PI_MODES: C.PLUG_MODE_BOTH,
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44 C.PI_PROTOCOLS: ["XEP-0231"],
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45 C.PI_MAIN: "XEP_0231",
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46 C.PI_HANDLER: "yes",
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47 C.PI_DESCRIPTION: _(
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48 """Implementation of bits of binary (used for small images/files)"""
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49 ),
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50 }
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51
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52 NS_BOB = u"urn:xmpp:bob"
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53 IQ_BOB_REQUEST = C.IQ_GET + '/data[@xmlns="' + NS_BOB + '"]'
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54
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55
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56 class XEP_0231(object):
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57 def __init__(self, host):
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58 log.info(_(u"plugin Bits of Binary initialization"))
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59 self.host = host
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60 host.registerNamespace("bob", NS_BOB)
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61 host.trigger.add("xhtml_post_treat", self.XHTMLTrigger)
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62 host.bridge.addMethod(
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63 "bobGetFile",
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64 ".plugin",
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65 in_sign="sss",
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66 out_sign="s",
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67 method=self._getFile,
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68 async=True,
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69 )
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71 def dumpData(self, cache, data_elt, cid):
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72 """save file encoded in data_elt to cache
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73
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74 @param cache(memory.cache.Cache): cache to use to store the data
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75 @param data_elt(domish.Element): <data> as in XEP-0231
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76 @param cid(unicode): content-id
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77 @return(unicode): full path to dumped file
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78 """
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79 #  FIXME: is it needed to use a separate thread?
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80 # probably not with the little data expected with BoB
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81 try:
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82 max_age = int(data_elt["max-age"])
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83 if max_age < 0:
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84 raise ValueError
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85 except (KeyError, ValueError):
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86 log.warning(u"invalid max-age found")
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87 max_age = None
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88
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89 with cache.cacheData(
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90 PLUGIN_INFO[C.PI_IMPORT_NAME], cid, data_elt.getAttribute("type"), max_age
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91 ) as f:
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92
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93 file_path = f.name
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94 f.write(base64.b64decode(str(data_elt)))
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95
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96 return file_path
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97
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98 def getHandler(self, client):
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99 return XEP_0231_handler(self)
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100
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101 def _requestCb(self, iq_elt, cache, cid):
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102 for data_elt in iq_elt.elements(NS_BOB, u"data"):
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103 if data_elt.getAttribute("cid") == cid:
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104 file_path = self.dumpData(cache, data_elt, cid)
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105 return file_path
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106
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107 log.warning(
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108 u"invalid data stanza received, requested cid was not found:\n{iq_elt}\nrequested cid: {cid}".format(
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109 iq_elt=iq_elt, cid=cid
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110 )
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111 )
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112 raise failure.Failure(exceptions.DataError("missing data"))
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113
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114 def _requestEb(self, failure_):
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115 """Log the error and continue errback chain"""
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116 log.warning(u"Can't get requested data:\n{reason}".format(reason=failure_))
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117 return failure_
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118
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119 def requestData(self, client, to_jid, cid, cache=None):
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120 """Request data if we don't have it in cache
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121
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122 @param to_jid(jid.JID): jid to request the data to
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123 @param cid(unicode): content id
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124 @param cache(memory.cache.Cache, None): cache to use
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125 client.cache will be used if None
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126 @return D(unicode): path to file with data
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127 """
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128 if cache is None:
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129 cache = client.cache
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130 iq_elt = client.IQ("get")
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131 iq_elt["to"] = to_jid.full()
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132 data_elt = iq_elt.addElement((NS_BOB, "data"))
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133 data_elt["cid"] = cid
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134 d = iq_elt.send()
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135 d.addCallback(self._requestCb, cache, cid)
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136 d.addErrback(self._requestEb)
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137 return d
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138
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139 def _setImgEltSrc(self, path, img_elt):
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140 img_elt[u"src"] = u"file://{}".format(path)
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141
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142 def XHTMLTrigger(self, client, message_elt, body_elt, lang, treat_d):
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143 for img_elt in xml_tools.findAll(body_elt, C.NS_XHTML, u"img"):
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144 source = img_elt.getAttribute(u"src", "")
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145 if source.startswith(u"cid:"):
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146 cid = source[4:]
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147 file_path = client.cache.getFilePath(cid)
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148 if file_path is not None:
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149 #  image is in cache, we change the url
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150 img_elt[u"src"] = u"file://{}".format(file_path)
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151 continue
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152 else:
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153 # image is not in cache, is it given locally?
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154 for data_elt in message_elt.elements(NS_BOB, u"data"):
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155 if data_elt.getAttribute("cid") == cid:
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156 file_path = self.dumpData(client.cache, data_elt, cid)
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157 img_elt[u"src"] = u"file://{}".format(file_path)
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158 break
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159 else:
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160 # cid not found locally, we need to request it
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161 # so we use the deferred
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162 d = self.requestData(client, jid.JID(message_elt["from"]), cid)
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163 d.addCallback(partial(self._setImgEltSrc, img_elt=img_elt))
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parents:
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164 treat_d.addCallback(lambda dummy: d)
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165
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166 def onComponentRequest(self, iq_elt, client):
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167 """cache data is retrieve from common cache for components"""
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168 # FIXME: this is a security/privacy issue as no access check is done
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169 # but this is mitigated by the fact that the cid must be known.
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170 # An access check should be implemented though.
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171
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172 iq_elt.handled = True
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173 data_elt = next(iq_elt.elements(NS_BOB, "data"))
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174 try:
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175 cid = data_elt[u"cid"]
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176 except KeyError:
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177 error_elt = jabber_error.StanzaError("not-acceptable").toResponse(iq_elt)
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178 client.send(error_elt)
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179 return
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180
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Goffi <goffi@goffi.org>
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diff changeset
181 metadata = self.host.common_cache.getMetadata(cid)
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182 if metadata is None:
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183 error_elt = jabber_error.StanzaError("item-not-found").toResponse(iq_elt)
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184 client.send(error_elt)
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185 return
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186
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187 with open(metadata["path"]) as f:
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188 data = f.read()
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189
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190 result_elt = xmlstream.toResponse(iq_elt, "result")
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191 data_elt = result_elt.addElement((NS_BOB, "data"), content=data.encode("base64"))
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192 data_elt[u"cid"] = cid
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193 data_elt[u"type"] = metadata[u"mime_type"]
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194 data_elt[u"max-age"] = unicode(int(max(0, metadata["eol"] - time.time())))
2522
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195 client.send(result_elt)
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diff changeset
196
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Goffi <goffi@goffi.org>
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diff changeset
197 def _getFile(self, peer_jid_s, cid, profile):
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198 peer_jid = jid.JID(peer_jid_s)
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diff changeset
199 assert cid
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200 client = self.host.getClient(profile)
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201 return self.getFile(client, peer_jid, cid)
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diff changeset
202
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Goffi <goffi@goffi.org>
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diff changeset
203 def getFile(self, client, peer_jid, cid, parent_elt=None):
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Goffi <goffi@goffi.org>
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204 """Retrieve a file from it's content-id
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diff changeset
205
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Goffi <goffi@goffi.org>
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diff changeset
206 @param peer_jid(jid.JID): jid of the entity offering the data
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diff changeset
207 @param cid(unicode): content-id of file data
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208 @param parent_elt(domish.Element, None): if file is not in cache,
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parents: 2511
diff changeset
209 data will be looked after in children of this elements.
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diff changeset
210 None to ignore
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211 @return D(unicode): path to cached data
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212 """
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213 file_path = client.cache.getFilePath(cid)
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214 if file_path is not None:
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215 #  file is in cache
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216 return defer.succeed(file_path)
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217 else:
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diff changeset
218 # file not in cache, is it given locally?
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diff changeset
219 if parent_elt is not None:
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220 for data_elt in parent_elt.elements(NS_BOB, u"data"):
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diff changeset
221 if data_elt.getAttribute("cid") == cid:
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diff changeset
222 return defer.succeed(self.dumpData(client.cache, data_elt, cid))
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223
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diff changeset
224 # cid not found locally, we need to request it
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diff changeset
225 # so we use the deferred
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226 return self.requestData(client, peer_jid, cid)
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227
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228
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229 class XEP_0231_handler(xmlstream.XMPPHandler):
2110
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230 implements(iwokkel.IDisco)
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231
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232 def __init__(self, plugin_parent):
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233 self.plugin_parent = plugin_parent
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234 self.host = plugin_parent.host
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235
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Goffi <goffi@goffi.org>
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diff changeset
236 def connectionInitialized(self):
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237 if self.parent.is_component:
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238 self.xmlstream.addObserver(
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diff changeset
239 IQ_BOB_REQUEST, self.plugin_parent.onComponentRequest, client=self.parent
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240 )
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241
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242 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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243 return [disco.DiscoFeature(NS_BOB)]
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244
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245 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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246 return []