Mercurial > libervia-backend

annotate libervia/backend/plugins/plugin_xep_0231.py @ 4071:4b842c1fb686

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refactoring: renamed `sat` package to `libervia.backend`
author Goffi <goffi@goffi.org>
date Fri, 02 Jun 2023 11:49:51 +0200
parents sat/plugins/plugin_xep_0231.py@524856bd7b19
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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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) 2009-2021 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 import base64
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21 import time
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22 from pathlib import Path
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23 from functools import partial
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24 from zope.interface import implementer
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25 from twisted.python import failure
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26 from twisted.words.protocols.jabber import xmlstream
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27 from twisted.words.protocols.jabber import jid
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28 from twisted.words.protocols.jabber import error as jabber_error
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29 from twisted.internet import defer
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30 from wokkel import disco, iwokkel
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31 from libervia.backend.tools import xml_tools
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32 from libervia.backend.core.i18n import _
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33 from libervia.backend.core.constants import Const as C
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34 from libervia.backend.core import exceptions
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35 from libervia.backend.core.log import getLogger
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36
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37 log = getLogger(__name__)
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38
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39
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40 PLUGIN_INFO = {
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41 C.PI_NAME: "Bits of Binary",
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42 C.PI_IMPORT_NAME: "XEP-0231",
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43 C.PI_TYPE: "XEP",
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44 C.PI_MODES: C.PLUG_MODE_BOTH,
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45 C.PI_PROTOCOLS: ["XEP-0231"],
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46 C.PI_MAIN: "XEP_0231",
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47 C.PI_HANDLER: "yes",
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48 C.PI_DESCRIPTION: _(
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49 """Implementation of bits of binary (used for small images/files)"""
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50 ),
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51 }
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52
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53 NS_BOB = "urn:xmpp:bob"
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54 IQ_BOB_REQUEST = C.IQ_GET + '/data[@xmlns="' + NS_BOB + '"]'
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55
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56
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57 class XEP_0231(object):
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58 def __init__(self, host):
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59 log.info(_("plugin Bits of Binary initialization"))
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60 self.host = host
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61 host.register_namespace("bob", NS_BOB)
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62 host.trigger.add("xhtml_post_treat", self.xhtml_trigger)
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63 host.bridge.add_method(
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64 "bob_get_file",
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65 ".plugin",
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66 in_sign="sss",
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67 out_sign="s",
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68 method=self._get_file,
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69 async_=True,
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70 )
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71
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72 def dump_data(self, cache, data_elt, cid):
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73 """save file encoded in data_elt to cache
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74
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75 @param cache(memory.cache.Cache): cache to use to store the data
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76 @param data_elt(domish.Element): <data> as in XEP-0231
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77 @param cid(unicode): content-id
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78 @return(unicode): full path to dumped file
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79 """
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80 #  FIXME: is it needed to use a separate thread?
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81 # probably not with the little data expected with BoB
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82 try:
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83 max_age = int(data_elt["max-age"])
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84 if max_age < 0:
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85 raise ValueError
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86 except (KeyError, ValueError):
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87 log.warning("invalid max-age found")
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88 max_age = None
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89
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90 with cache.cache_data(
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91 PLUGIN_INFO[C.PI_IMPORT_NAME], cid, data_elt.getAttribute("type"), max_age
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92 ) as f:
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93
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94 file_path = Path(f.name)
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95 f.write(base64.b64decode(str(data_elt)))
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96
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97 return file_path
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98
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99 def get_handler(self, client):
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100 return XEP_0231_handler(self)
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101
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102 def _request_cb(self, iq_elt, cache, cid):
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103 for data_elt in iq_elt.elements(NS_BOB, "data"):
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104 if data_elt.getAttribute("cid") == cid:
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105 file_path = self.dump_data(cache, data_elt, cid)
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106 return file_path
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107
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108 log.warning(
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109 "invalid data stanza received, requested cid was not found:\n{iq_elt}\nrequested cid: {cid}".format(
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110 iq_elt=iq_elt, cid=cid
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111 )
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112 )
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113 raise failure.Failure(exceptions.DataError("missing data"))
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114
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115 def _request_eb(self, failure_):
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116 """Log the error and continue errback chain"""
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117 log.warning("Can't get requested data:\n{reason}".format(reason=failure_))
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118 return failure_
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119
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120 def request_data(self, client, to_jid, cid, cache=None):
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121 """Request data if we don't have it in cache
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122
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123 @param to_jid(jid.JID): jid to request the data to
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124 @param cid(unicode): content id
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125 @param cache(memory.cache.Cache, None): cache to use
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126 client.cache will be used if None
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127 @return D(unicode): path to file with data
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128 """
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129 if cache is None:
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130 cache = client.cache
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131 iq_elt = client.IQ("get")
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132 iq_elt["to"] = to_jid.full()
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133 data_elt = iq_elt.addElement((NS_BOB, "data"))
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134 data_elt["cid"] = cid
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135 d = iq_elt.send()
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136 d.addCallback(self._request_cb, cache, cid)
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137 d.addErrback(self._request_eb)
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138 return d
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139
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140 def _set_img_elt_src(self, path, img_elt):
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141 img_elt["src"] = "file://{}".format(path)
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142
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143 def xhtml_trigger(self, client, message_elt, body_elt, lang, treat_d):
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144 for img_elt in xml_tools.find_all(body_elt, C.NS_XHTML, "img"):
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145 source = img_elt.getAttribute("src", "")
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146 if source.startswith("cid:"):
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147 cid = source[4:]
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148 file_path = client.cache.get_file_path(cid)
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149 if file_path is not None:
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150 #  image is in cache, we change the url
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151 img_elt["src"] = "file://{}".format(file_path)
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152 continue
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153 else:
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154 # image is not in cache, is it given locally?
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155 for data_elt in message_elt.elements(NS_BOB, "data"):
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156 if data_elt.getAttribute("cid") == cid:
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157 file_path = self.dump_data(client.cache, data_elt, cid)
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158 img_elt["src"] = "file://{}".format(file_path)
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159 break
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160 else:
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161 # cid not found locally, we need to request it
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162 # so we use the deferred
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163 d = self.request_data(client, jid.JID(message_elt["from"]), cid)
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164 d.addCallback(partial(self._set_img_elt_src, img_elt=img_elt))
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165 treat_d.addCallback(lambda __: d)
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166
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167 def on_component_request(self, iq_elt, client):
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168 """cache data is retrieve from common cache for components"""
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169 # FIXME: this is a security/privacy issue as no access check is done
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170 # but this is mitigated by the fact that the cid must be known.
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171 # An access check should be implemented though.
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172
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173 iq_elt.handled = True
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174 data_elt = next(iq_elt.elements(NS_BOB, "data"))
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175 try:
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176 cid = data_elt["cid"]
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177 except KeyError:
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178 error_elt = jabber_error.StanzaError("not-acceptable").toResponse(iq_elt)
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179 client.send(error_elt)
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180 return
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181
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182 metadata = self.host.common_cache.get_metadata(cid)
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183 if metadata is None:
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184 error_elt = jabber_error.StanzaError("item-not-found").toResponse(iq_elt)
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diff changeset
185 client.send(error_elt)
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186 return
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187
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188 with open(metadata["path"], 'rb') as f:
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189 data = f.read()
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diff changeset
190
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diff changeset
191 result_elt = xmlstream.toResponse(iq_elt, "result")
3273
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diff changeset
192 data_elt = result_elt.addElement(
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193 (NS_BOB, "data"), content=base64.b64encode(data).decode())
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194 data_elt["cid"] = cid
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195 data_elt["type"] = metadata["mime_type"]
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diff changeset
196 data_elt["max-age"] = str(int(max(0, metadata["eol"] - time.time())))
2522
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diff changeset
197 client.send(result_elt)
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diff changeset
198
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diff changeset
199 def _get_file(self, peer_jid_s, cid, profile):
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200 peer_jid = jid.JID(peer_jid_s)
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Goffi <goffi@goffi.org>
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diff changeset
201 assert cid
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Goffi <goffi@goffi.org>
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diff changeset
202 client = self.host.get_client(profile)
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parents: 3479
diff changeset
203 d = self.get_file(client, peer_jid, cid)
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204 d.addCallback(lambda path: str(path))
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Goffi <goffi@goffi.org>
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diff changeset
205 return d
2522
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Goffi <goffi@goffi.org>
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diff changeset
206
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diff changeset
207 def get_file(self, client, peer_jid, cid, parent_elt=None):
2522
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Goffi <goffi@goffi.org>
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208 """Retrieve a file from it's content-id
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209
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Goffi <goffi@goffi.org>
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diff changeset
210 @param peer_jid(jid.JID): jid of the entity offering the data
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211 @param cid(unicode): content-id of file data
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212 @param parent_elt(domish.Element, None): if file is not in cache,
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Goffi <goffi@goffi.org>
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diff changeset
213 data will be looked after in children of this elements.
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diff changeset
214 None to ignore
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Goffi <goffi@goffi.org>
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diff changeset
215 @return D(Path): path to cached data
2522
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diff changeset
216 """
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diff changeset
217 file_path = client.cache.get_file_path(cid)
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diff changeset
218 if file_path is not None:
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219 #  file is in cache
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diff changeset
220 return defer.succeed(file_path)
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diff changeset
221 else:
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
Goffi <goffi@goffi.org>
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diff changeset
222 # file not in cache, is it given locally?
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
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diff changeset
223 if parent_elt is not None:
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Goffi <goffi@goffi.org>
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224 for data_elt in parent_elt.elements(NS_BOB, "data"):
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diff changeset
225 if data_elt.getAttribute("cid") == cid:
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diff changeset
226 return defer.succeed(self.dump_data(client.cache, data_elt, cid))
2522
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227
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
Goffi <goffi@goffi.org>
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diff changeset
228 # cid not found locally, we need to request it
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229 # so we use the deferred
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diff changeset
230 return self.request_data(client, peer_jid, cid)
2522
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diff changeset
231
2110
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parents:
diff changeset
232
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diff changeset
233 @implementer(iwokkel.IDisco)
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Goffi <goffi@goffi.org>
parents: 2483
diff changeset
234 class XEP_0231_handler(xmlstream.XMPPHandler):
2110
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parents:
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235
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236 def __init__(self, plugin_parent):
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237 self.plugin_parent = plugin_parent
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diff changeset
238 self.host = plugin_parent.host
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diff changeset
239
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
Goffi <goffi@goffi.org>
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diff changeset
240 def connectionInitialized(self):
95c31756944c component file sharing, plugin XEP-0231: thumbnail are now returned by component using Bits of Binary:
Goffi <goffi@goffi.org>
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diff changeset
241 if self.parent.is_component:
2624
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parents: 2562
diff changeset
242 self.xmlstream.addObserver(
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524856bd7b19 massive refactoring to switch from camelCase to snake_case:
Goffi <goffi@goffi.org>
parents: 3479
diff changeset
243 IQ_BOB_REQUEST, self.plugin_parent.on_component_request, client=self.parent
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
244 )
2522
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
245
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
246 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
2110
2d633b3c923d plugin XEP-0231: Bits of Binary first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
247 return [disco.DiscoFeature(NS_BOB)]
2d633b3c923d plugin XEP-0231: Bits of Binary first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
248
2624
56f94936df1e code style reformatting using black
Goffi <goffi@goffi.org>
parents: 2562
diff changeset
249 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
2110
2d633b3c923d plugin XEP-0231: Bits of Binary first draft:
Goffi <goffi@goffi.org>
parents:
diff changeset
250 return []