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annotate sat/plugins/plugin_xep_0264.py @ 2622:8fb99ed47db4

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author Goffi <goffi@goffi.org>
date Wed, 27 Jun 2018 07:50:35 +0200
parents 26edcf3a30eb
children 56f94936df1e
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rev   line source
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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 managing xep-0264
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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6 # Copyright (C) 2014 Emmanuel Gil Peyrot (linkmauve@linkmauve.fr)
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7
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8 # This program is free software: you can redistribute it and/or modify
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9 # it under the terms of the GNU Affero General Public License as published by
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10 # the Free Software Foundation, either version 3 of the License, or
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11 # (at your option) any later version.
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12
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13 # This program is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 # GNU Affero General Public License for more details.
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17
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18 # You should have received a copy of the GNU Affero General Public License
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19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 from sat.core.i18n import _
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22 from sat.core.constants import Const as C
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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 twisted.internet import threads
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26 from twisted.python.failure import Failure
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27
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28 from zope.interface import implements
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29
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30 from wokkel import disco, iwokkel
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31
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32 from sat.core import exceptions
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33 import hashlib
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34 try:
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35 from PIL import Image
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36 except:
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37 raise exceptions.MissingModule(u"Missing module pillow, please download/install it from https://python-pillow.github.io")
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38
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39 # cf. https://stackoverflow.com/a/23575424
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40 from PIL import ImageFile
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41 ImageFile.LOAD_TRUNCATED_IMAGES = True
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42
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43 try:
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44 from twisted.words.protocols.xmlstream import XMPPHandler
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45 except ImportError:
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46 from wokkel.subprotocols import XMPPHandler
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47
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48
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49 MIME_TYPE = u'image/jpeg'
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50 SAVE_FORMAT = u'JPEG' # (cf. Pillow documentation)
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51
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52 NS_THUMBS = 'urn:xmpp:thumbs:1'
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53
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54 PLUGIN_INFO = {
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55 C.PI_NAME: "XEP-0264",
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56 C.PI_IMPORT_NAME: "XEP-0264",
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57 C.PI_TYPE: "XEP",
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58 C.PI_MODES: C.PLUG_MODE_BOTH,
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59 C.PI_PROTOCOLS: ["XEP-0264"],
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60 C.PI_DEPENDENCIES: ["XEP-0234"],
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61 C.PI_MAIN: "XEP_0264",
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62 C.PI_HANDLER: "yes",
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63 C.PI_DESCRIPTION: _("""Thumbnails handling""")
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64 }
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65
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66
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67 class XEP_0264(object):
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68 SIZE_SMALL = (250, 250)
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69 SIZE_MEDIUM = (1024, 1024)
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70
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71 def __init__(self, host):
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72 log.info(_(u"Plugin XEP_0264 initialization"))
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73 self.host = host
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74 host.trigger.add("XEP-0234_buildFileElement", self._addFileThumbnails)
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75 host.trigger.add("XEP-0234_parseFileElement", self._getFileThumbnails)
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76
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77 def getHandler(self, client):
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78 return XEP_0264_handler()
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79
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80 ## triggers ##
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81
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82 def _addFileThumbnails(self, file_elt, extra_args):
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83 try:
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84 thumbnails = extra_args[u'extra'][C.KEY_THUMBNAILS]
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85 except KeyError:
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86 return
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87 for thumbnail in thumbnails:
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88 thumbnail_elt = file_elt.addElement((NS_THUMBS, u'thumbnail'))
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89 thumbnail_elt['uri'] = u'cid:' + thumbnail['id']
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90 thumbnail_elt['media-type'] = MIME_TYPE
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91 width, height = thumbnail['size']
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92 thumbnail_elt['width'] = unicode(width)
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93 thumbnail_elt['height'] = unicode(height)
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94 return True
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95
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96 def _getFileThumbnails(self, file_elt, file_data):
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97 thumbnails = []
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98 for thumbnail_elt in file_elt.elements(NS_THUMBS, u'thumbnail'):
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99 uri = thumbnail_elt['uri']
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100 if uri.startswith ('cid:'):
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101 thumbnail = {'id': uri[4:]}
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102 width = thumbnail_elt.getAttribute('width')
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103 height = thumbnail_elt.getAttribute('height')
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104 if width and height:
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105 try:
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106 thumbnail['size'] = int(width), int(height)
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107 except ValueError:
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108 pass
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109 try:
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110 thumbnail['mime_type'] = thumbnail_elt['media-type']
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111 except KeyError:
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112 pass
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113 thumbnails.append(thumbnail)
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114
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115 if thumbnails:
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116 file_data.setdefault('extra', {})[C.KEY_THUMBNAILS] = thumbnails
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117 return True
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118
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119 ## thumbnails generation ##
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120
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121 def getThumbId(self, image_uid, size):
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122 """return an ID unique for image/size combination
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123
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124 @param image_uid(unicode): unique id of the image
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125 can be a hash
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126 @param size(tuple(int)): requested size of thumbnail
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127 @return (unicode): unique id for this image/size
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128 """
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129 return hashlib.sha256(repr((image_uid, size))).hexdigest()
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130
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131 def _blockingGenThumb(self, source_path, size=None, max_age=None, image_uid=None):
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132 """Generate a thumbnail for image
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133
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134 This is a blocking method and must be executed in a thread
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135 params are the same as for [generateThumbnail]
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136 """
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137 if size is None:
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138 size = self.SIZE_SMALL
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139 try:
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140 img = Image.open(source_path)
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141 except IOError:
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142 return Failure(exceptions.DataError(u"Can't open image"))
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143
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144 img.thumbnail(size)
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145 uid = self.getThumbId(image_uid or source_path, size)
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146
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147 with self.host.common_cache.cacheData(
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148 PLUGIN_INFO[C.PI_IMPORT_NAME],
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149 uid,
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150 MIME_TYPE,
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151 max_age,
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152 ) as f:
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153 img.save(f, SAVE_FORMAT)
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154
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155 return img.size, uid
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156
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157 def generateThumbnail(self, source_path, size=None, max_age=None, image_uid=None):
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158 """Generate a thumbnail of image
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159
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160 @param source_path(unicode): absolute path to source image
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161 @param size(int, None): max size of the thumbnail
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162 can be one of self.SIZE_*
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163 None to use default value (i.e. self.SIZE_SMALL)
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164 @param max_age(int, None): same as for [memory.cache.Cache.cacheData])
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165 @param image_uid(unicode, None): unique ID to identify the image
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166 use hash whenever possible
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167 if None, source_path will be used
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168 @return D(tuple[tuple[int,int], unicode]): tuple with:
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169 - size of the thumbnail
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170 - unique Id of the thumbnail
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171 """
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172
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173 d = threads.deferToThread(
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174 self._blockingGenThumb, source_path, size, max_age, image_uid=image_uid)
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175 d.addErrback(lambda failure_:
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176 log.error(u"thumbnail generation error: {}".format(failure_)))
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177 return d
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178
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179
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180 class XEP_0264_handler(XMPPHandler):
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181 implements(iwokkel.IDisco)
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182
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183 def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
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184 return [disco.DiscoFeature(NS_THUMBS)]
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185
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186 def getDiscoItems(self, requestor, target, nodeIdentifier=''):
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187 return []