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annotate sat/plugins/plugin_xep_0231.py @ 2886:b06cb71079fa

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core (xmpp): new networkEnabled() and networkDisabled() methods: those methods can be called by platform specific plugins when network is known to be (un)available. This way, connection attempts can be cancelled when no network is available, saving resources (notably battery on mobile devices), or attempts can be restarted immediately when network is known to be available again.
author Goffi <goffi@goffi.org>
date Sat, 06 Apr 2019 19:05:57 +0200
parents 003b8b4b56a7
children ab2696e34d29
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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) 2009-2019 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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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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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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164 treat_d.addCallback(lambda __: 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)
2522
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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)
2522
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184 client.send(error_elt)
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185 return
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186
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diff changeset
187 with open(metadata["path"]) as f:
2522
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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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parents: 2562
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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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diff changeset
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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diff changeset
201 return self.getFile(client, peer_jid, cid)
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diff changeset
202
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Goffi <goffi@goffi.org>
parents: 2511
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
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
Goffi <goffi@goffi.org>
parents: 2511
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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Goffi <goffi@goffi.org>
parents: 2511
diff changeset
209 data will be looked after in children of this elements.
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Goffi <goffi@goffi.org>
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diff changeset
210 None to ignore
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Goffi <goffi@goffi.org>
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diff changeset
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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diff changeset
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:
2522
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diff changeset
222 return defer.succeed(self.dumpData(client.cache, data_elt, cid))
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diff changeset
223
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diff changeset
224 # cid not found locally, we need to request it
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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
2522
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232 def __init__(self, plugin_parent):
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233 self.plugin_parent = plugin_parent
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diff changeset
234 self.host = plugin_parent.host
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diff changeset
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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diff changeset
238 self.xmlstream.addObserver(
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parents: 2562
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239 IQ_BOB_REQUEST, self.plugin_parent.onComponentRequest, client=self.parent
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parents: 2562
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240 )
2522
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
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parents: 2511
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241
2624
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parents: 2562
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242 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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Goffi <goffi@goffi.org>
parents:
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243 return [disco.DiscoFeature(NS_BOB)]
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Goffi <goffi@goffi.org>
parents:
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244
2624
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parents: 2562
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245 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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2d633b3c923d plugin XEP-0231: Bits of Binary first draft:
Goffi <goffi@goffi.org>
parents:
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246 return []