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annotate src/plugins/plugin_comp_file_sharing.py @ 2504:67cc54b01a12

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plugin file sharing component: first draft: this component act as an endpoint where a user can store and retrieve its files using Jingle.
author Goffi <goffi@goffi.org>
date Wed, 28 Feb 2018 18:28:39 +0100
parents
children 4440ea7047bd
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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 parrot mode (experimental)
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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.common import regex
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26 from sat.tools import stream
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27 from twisted.internet import defer
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28 import os
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29 import os.path
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30
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31
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32 PLUGIN_INFO = {
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33 C.PI_NAME: "File sharing component",
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34 C.PI_IMPORT_NAME: "file_sharing",
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35 C.PI_MODES: [C.PLUG_MODE_COMPONENT],
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36 C.PI_TYPE: C.PLUG_TYPE_ENTRY_POINT,
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37 C.PI_PROTOCOLS: [],
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38 C.PI_DEPENDENCIES: ["FILE", "XEP-0234", "XEP-0260", "XEP-0261", "XEP-0329"],
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39 C.PI_RECOMMENDATIONS: [],
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40 C.PI_MAIN: "FileSharing",
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41 C.PI_HANDLER: "no",
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42 C.PI_DESCRIPTION: _(u"""Component hosting and sharing files""")
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43 }
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44
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45 PROGRESS_ID_KEY = 'progress_id'
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46 HASH_ALGO = u'sha-256'
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47
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48
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49 class FileSharing(object):
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50
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51 def __init__(self, host):
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52 log.info(_(u"File Sharing initialization"))
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53 self.host = host
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54 self._f = host.plugins['FILE']
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55 self._jf = host.plugins['XEP-0234']
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56 self._h = host.plugins['XEP-0300']
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57 host.trigger.add("FILE_getDestDir", self._getDestDirTrigger)
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58 host.trigger.add("XEP-0234_fileSendingRequest", self._fileSendingRequestTrigger, priority=1000)
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59 self.files_path = host.getLocalPath(None, C.FILES_DIR, profile=False)
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60
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61 def profileConnected(self, client):
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62 path = client.file_tmp_dir = os.path.join(
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63 self.host.memory.getConfig('', 'local_dir'),
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64 C.FILES_TMP_DIR,
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65 regex.pathEscape(client.profile))
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66 if not os.path.exists(path):
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67 os.makedirs(path)
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68
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69 @defer.inlineCallbacks
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70 def _fileTransferedCb(self, dummy, client, peer_jid, file_data, file_path):
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71 if file_data[u'hash_algo'] == HASH_ALGO:
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72 log.debug(_(u"Reusing already generated hash"))
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73 file_hash = file_data[u'hash_hasher'].hexdigest()
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74 else:
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75 hasher = self._h.getHasher(HASH_ALGO)
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76 with open('file_path') as f:
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77 file_hash = yield self._h.calculateHash(f, hasher)
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78 final_path = os.path.join(self.files_path, file_hash)
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79 if os.path.isfile(final_path):
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80 log.debug(u"file [{file_hash}] already exists, we can remove temporary one".format(file_hash = file_hash))
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81 os.unlink(file_path)
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82 else:
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83 os.rename(file_path, final_path)
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84 log.debug(u"file [{file_hash}] moved to {files_path}".format(file_hash=file_hash, files_path=self.files_path))
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85 self.host.memory.setFile(client,
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86 name=file_data[u'name'],
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87 version=u'',
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88 file_hash=file_hash,
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89 hash_algo=HASH_ALGO,
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90 size=file_data[u'size'],
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91 path=file_data.get(u'path'),
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92 namespace=file_data.get(u'namespace'),
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93 owner=peer_jid)
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94
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95 def _getDestDirTrigger(self, client, peer_jid, transfer_data, file_data, stream_object):
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96 if not client.is_component:
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97 return True, None
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98 assert stream_object
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99 assert 'stream_object' not in transfer_data
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100 assert PROGRESS_ID_KEY in file_data
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101 filename = file_data['name']
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102 assert filename and not '/' in filename
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103 file_tmp_dir = self.host.getLocalPath(client, C.FILES_TMP_DIR, peer_jid.userhost(), component=True, profile=False)
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104 file_tmp_path = file_data['file_path'] = os.path.join(file_tmp_dir, file_data['name'])
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105
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106 transfer_data['finished_d'].addCallback(self._fileTransferedCb, client, peer_jid, file_data, file_tmp_path)
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107
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108 self._f.openFileWrite(client, file_tmp_path, transfer_data, file_data, stream_object)
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109 return False, defer.succeed(True)
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110
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111 @defer.inlineCallbacks
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112 def _retrieveFiles(self, client, session, content_data, content_name, file_data, file_elt):
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113 peer_jid = session[u'peer_jid']
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114 try:
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115 found_files = yield self.host.memory.getFiles(client,
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116 peer_jid=peer_jid,
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117 name=file_data.get(u'name'),
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118 file_hash=file_data.get(u'hash'),
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119 hash_algo=file_data.get(u'hash_algo'),
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120 path=file_data.get(u'path'),
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121 namespace=file_data.get(u'namespace'))
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122 except exceptions.NotFound:
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123 found_files = None
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124 except exceptions.PermissionError:
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125 log.warning(_(u"{peer_jid} is trying to access an unauthorized file: {name}").format(
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126 peer_jid=peer_jid, name=file_data.get(u'name')))
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127 defer.returnValue(False)
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128
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129 if not found_files:
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130 log.warning(_(u"no matching file found ({file_data})").format(file_data=file_data))
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131 defer.returnValue(False)
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132
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133 # we only use the first found file
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134 found_file = found_files[0]
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135 file_hash = found_file[u'hash']
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136 file_path = os.path.join(self.files_path, file_hash)
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137 file_data[u'hash_hasher'] = hasher = self._h.getHasher(found_file[u'hash_algo'])
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138 size = file_data[u'size'] = found_file[u'size']
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139 file_data[u'file_hash'] = file_hash
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140 file_data[u'hash_algo'] = found_file[u'hash_algo']
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141
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142 # we complete file_elt so peer can have some details on the file
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143 if u'name' not in file_data:
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144 file_elt.addElement(u'name', content=found_file[u'name'])
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145 file_elt.addElement(u'size', content=unicode(size))
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146 content_data['stream_object'] = stream.FileStreamObject(
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147 self.host,
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148 client,
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149 file_path,
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150 uid=self._jf.getProgressId(session, content_name),
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151 size=size,
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152 data_cb=lambda data: hasher.update(data),
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153 )
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154 defer.returnValue(True)
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155
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156 def _fileSendingRequestTrigger(self, client, session, content_data, content_name, file_data, file_elt):
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157 if not client.is_component:
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158 return True, None
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159 else:
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160 return False, self._retrieveFiles(client, session, content_data, content_name, file_data, file_elt)