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annotate sat/plugins/plugin_misc_download.py @ 3088:d1464548055a

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plugin file download: meta plugin to handle file download: - first code in backend to use async/await Python syntax \o/ - plugin with file upload - URL schemes can be registered - `http` and `https` schemes are handled by default
author Goffi <goffi@goffi.org>
date Fri, 20 Dec 2019 12:28:04 +0100
parents
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3088
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1 #!/usr/bin/env python3
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2
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3 # SAT plugin for downloading files
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4 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 from pathlib import Path
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20 from urllib.parse import urlparse
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21 import treq
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22 from twisted.internet import defer
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23 from twisted.words.protocols.jabber import error as jabber_error
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24 from sat.core.i18n import _, D_
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25 from sat.core.constants import Const as C
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26 from sat.core.log import getLogger
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27 from sat.core import exceptions
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28 from sat.tools import xml_tools
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29 from sat.tools.common import data_format
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30 from sat.tools import stream
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31
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32 log = getLogger(__name__)
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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: "File Download",
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37 C.PI_IMPORT_NAME: "DOWNLOAD",
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38 C.PI_TYPE: C.PLUG_TYPE_MISC,
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39 C.PI_MAIN: "DownloadPlugin",
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40 C.PI_HANDLER: "no",
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41 C.PI_DESCRIPTION: _("""File download management"""),
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42 }
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43
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44
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45 class DownloadPlugin(object):
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46
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47 def __init__(self, host):
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48 log.info(_("plugin Download initialization"))
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49 self.host = host
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50 host.bridge.addMethod(
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51 "fileDownload",
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52 ".plugin",
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53 in_sign="ssss",
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54 out_sign="a{ss}",
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55 method=self._fileDownload,
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56 async_=True,
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57 )
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58 host.bridge.addMethod(
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59 "fileDownloadComplete",
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60 ".plugin",
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61 in_sign="ssss",
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62 out_sign="s",
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63 method=self._fileDownloadComplete,
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64 async_=True,
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65 )
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66 self._download_callbacks = {}
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67 self.registerScheme('http', self.downloadHTTP)
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68 self.registerScheme('https', self.downloadHTTP)
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69
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70 def _fileDownload(self, uri, dest_path, options_s, profile):
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71 client = self.host.getClient(profile)
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72 options = data_format.deserialise(options_s)
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73
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74 return defer.ensureDeferred(self.fileDownload(
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75 client, uri, Path(dest_path), options
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76 ))
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77
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78 async def fileDownload(self, client, uri, dest_path, options=None):
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79 """Send a file using best available method
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80
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81 parameters are the same as for [download]
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82 @return (dict): action dictionary, with progress id in case of success, else xmlui
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83 message
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84 """
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85 try:
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86 progress_id, __ = await self.download(client, uri, dest_path, options)
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87 except Exception as e:
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88 if (isinstance(e, jabber_error.StanzaError)
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89 and e.condition == 'not-acceptable'):
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90 reason = e.text
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91 else:
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92 reason = str(e)
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93 msg = D_("Can't download file: {reason}").format(reason=reason)
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94 log.warning(msg)
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95 return {
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96 "xmlui": xml_tools.note(
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97 msg, D_("Can't download file"), C.XMLUI_DATA_LVL_WARNING
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98 ).toXml()
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99 }
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100 else:
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101 return {"progress": progress_id}
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102
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103 def _fileDownloadComplete(self, uri, dest_path, options_s, profile):
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104 client = self.host.getClient(profile)
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105 options = data_format.deserialise(options_s)
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106
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107 d = defer.ensureDeferred(self.fileDownloadComplete(
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108 client, uri, Path(dest_path), options
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109 ))
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110 d.addCallback(lambda path: str(path))
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111 return d
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112
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113 async def fileDownloadComplete(self, client, uri, dest_path, options=None):
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114 """Helper method to fully download a file and return its path
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115
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116 parameters are the same as for [download]
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117 @return (str): path to the downloaded file
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118 """
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119 __, download_d = await self.download(client, uri, dest_path, options)
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120 await download_d
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121 return dest_path
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122
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123 async def download(self, client, uri, dest_path, options=None):
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124 """Send a file using best available method
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125
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126 @param uri(str): URI to the file to download
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127 @param dest_path(str, Path): where the file must be downloaded
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128 @param options(dict, None): options depending on scheme handler
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129 Some common options:
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130 - ignore_tls_errors(bool): True to ignore SSL/TLS certificate verification
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131 used only if HTTPS transport is needed
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132 @return (tuple[unicode,D(unicode)]): progress_id and a Deferred which fire
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133 download URL when download is finished
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134 """
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135 if options is None:
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136 options = {}
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137
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138 dest_path = Path(dest_path)
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139 uri_parsed = urlparse(uri, 'http')
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140 try:
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141 callback = self._download_callbacks[uri_parsed.scheme]
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142 except KeyError:
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143 raise exceptions.NotFound(f"Can't find any handler for uri {uri}")
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144 else:
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145 return await callback(client, uri_parsed, dest_path, options)
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146
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147 def registerScheme(self, scheme, download_cb):
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148 """Register an URI scheme handler
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149
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150 @param scheme(unicode): URI scheme this callback is handling
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151 @param download_cb(callable): callback to download a file
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152 arguments are:
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153 - (SatXMPPClient) client
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154 - (urllib.parse.SplitResult) parsed URI
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155 - (Path) destination path where the file must be downloaded
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156 - (dict) options
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157 must return a tuple with progress_id and a Deferred which fire when download
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158 is finished
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159 """
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160 if scheme in self._download_callbacks:
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161 raise exceptions.ConflictError(
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162 f"A method with scheme {scheme!r} is already registered"
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163 )
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164 self._download_callbacks[scheme] = download_cb
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165
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166 def unregister(self, scheme):
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167 try:
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168 del self._download_callbacks[scheme]
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169 except KeyError:
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170 raise exceptions.NotFound(f"No callback registered for scheme {scheme!r}")
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171
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172 async def downloadHTTP(self, client, uri_parsed, dest_path, options):
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173 url = uri_parsed.geturl()
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174
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175 head_data = await treq.head(url)
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176 try:
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177 content_length = int(head_data.headers.getRawHeaders('content-length')[0])
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178 except (KeyError, TypeError, IndexError):
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179 content_length = None
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180 log.debug(f"No content lenght found at {url}")
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181 file_obj = stream.SatFile(
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182 self.host,
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183 client,
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184 dest_path,
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185 mode="wb",
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186 size = content_length,
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187 )
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188
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189 progress_id = file_obj.uid
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190
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191 resp = await treq.get(url, unbuffered=True)
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192 d = treq.collect(resp, file_obj.write)
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193 d.addBoth(lambda _: file_obj.close())
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194 return progress_id, d