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annotate sat/plugins/plugin_xep_0264.py @ 3329:15612c0fb421

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plugin XEP-0264: updated size to get values closest to standard one: - sizes used for thumbnails are now matching common resolutions. - added BIG and FULL_SCREEN sizes - sort thumbnails by sizes when parsing them.
author Goffi <goffi@goffi.org>
date Thu, 13 Aug 2020 23:45:59 +0200
parents 5887fb414758
children 7b47f48d31f3
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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 managing xep-0264
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5 # Copyright (C) 2009-2020 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
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25 log = getLogger(__name__)
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26 from twisted.internet import threads
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27 from twisted.python.failure import Failure
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28
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29 from zope.interface import implementer
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30
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31 from wokkel import disco, iwokkel
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32
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33 from sat.core import exceptions
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34 import hashlib
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35
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36 try:
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37 from PIL import Image
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38 except:
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39 raise exceptions.MissingModule(
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40 "Missing module pillow, please download/install it from https://python-pillow.github.io"
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41 )
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42
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43 #  cf. https://stackoverflow.com/a/23575424
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44 from PIL import ImageFile
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45
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46 ImageFile.LOAD_TRUNCATED_IMAGES = True
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47
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48 try:
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49 from twisted.words.protocols.xmlstream import XMPPHandler
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50 except ImportError:
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51 from wokkel.subprotocols import XMPPHandler
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52
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53
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54 MIME_TYPE = "image/jpeg"
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55 SAVE_FORMAT = "JPEG" # (cf. Pillow documentation)
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56
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57 NS_THUMBS = "urn:xmpp:thumbs:1"
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58
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59 PLUGIN_INFO = {
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60 C.PI_NAME: "XEP-0264",
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61 C.PI_IMPORT_NAME: "XEP-0264",
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62 C.PI_TYPE: "XEP",
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63 C.PI_MODES: C.PLUG_MODE_BOTH,
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64 C.PI_PROTOCOLS: ["XEP-0264"],
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65 C.PI_DEPENDENCIES: ["XEP-0234"],
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66 C.PI_MAIN: "XEP_0264",
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67 C.PI_HANDLER: "yes",
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68 C.PI_DESCRIPTION: _("""Thumbnails handling"""),
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69 }
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70
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71
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72 class XEP_0264(object):
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73 SIZE_SMALL = (320, 320)
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74 SIZE_MEDIUM = (640, 640)
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75 SIZE_BIG = (1280, 1280)
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76 SIZE_FULL_SCREEN = (2560, 2560)
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77 SIZES = (SIZE_SMALL, SIZE_MEDIUM, SIZE_FULL_SCREEN)
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78
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79 def __init__(self, host):
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80 log.info(_("Plugin XEP_0264 initialization"))
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81 self.host = host
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82 host.trigger.add("XEP-0234_buildFileElement", self._addFileThumbnails)
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83 host.trigger.add("XEP-0234_parseFileElement", self._getFileThumbnails)
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84
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85 def getHandler(self, client):
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86 return XEP_0264_handler()
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87
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88 ## triggers ##
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89
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90 def _addFileThumbnails(self, client, file_elt, extra_args):
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91 try:
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92 thumbnails = extra_args["extra"][C.KEY_THUMBNAILS]
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93 except KeyError:
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94 return
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95 for thumbnail in thumbnails:
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96 thumbnail_elt = file_elt.addElement((NS_THUMBS, "thumbnail"))
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97 thumbnail_elt["uri"] = "cid:" + thumbnail["id"]
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98 thumbnail_elt["media-type"] = MIME_TYPE
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99 width, height = thumbnail["size"]
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100 thumbnail_elt["width"] = str(width)
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101 thumbnail_elt["height"] = str(height)
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102 return True
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103
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104 def _getFileThumbnails(self, client, file_elt, file_data):
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105 thumbnails = []
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106 for thumbnail_elt in file_elt.elements(NS_THUMBS, "thumbnail"):
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107 uri = thumbnail_elt["uri"]
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108 if uri.startswith("cid:"):
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109 thumbnail = {"id": uri[4:]}
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110 width = thumbnail_elt.getAttribute("width")
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111 height = thumbnail_elt.getAttribute("height")
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112 if width and height:
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113 try:
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114 thumbnail["size"] = (int(width), int(height))
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115 except ValueError:
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116 pass
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117 try:
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118 thumbnail["mime_type"] = thumbnail_elt["media-type"]
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119 except KeyError:
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120 pass
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121 thumbnails.append(thumbnail)
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122
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123 if thumbnails:
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124 # we want thumbnails ordered from smallest to biggest
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125 thumbnails.sort(key=lambda t: t.get('size', (0, 0)))
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126 file_data.setdefault("extra", {})[C.KEY_THUMBNAILS] = thumbnails
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127 return True
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128
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129 ## thumbnails generation ##
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130
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131 def getThumbId(self, image_uid, size):
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132 """return an ID unique for image/size combination
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133
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134 @param image_uid(unicode): unique id of the image
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135 can be a hash
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136 @param size(tuple(int)): requested size of thumbnail
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137 @return (unicode): unique id for this image/size
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138 """
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139 return hashlib.sha256(repr((image_uid, size)).encode()).hexdigest()
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140
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141 def _blockingGenThumb(self, source_path, size=None, max_age=None, image_uid=None):
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142 """Generate a thumbnail for image
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143
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144 This is a blocking method and must be executed in a thread
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145 params are the same as for [generateThumbnail]
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146 """
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147 if size is None:
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148 size = self.SIZE_SMALL
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149 try:
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150 img = Image.open(source_path)
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151 except IOError:
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152 return Failure(exceptions.DataError("Can't open image"))
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153
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154 img.thumbnail(size)
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155 uid = self.getThumbId(image_uid or source_path, size)
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156
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157 with self.host.common_cache.cacheData(
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158 PLUGIN_INFO[C.PI_IMPORT_NAME], uid, MIME_TYPE, max_age
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159 ) as f:
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160 img.save(f, SAVE_FORMAT)
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161
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162 return img.size, uid
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163
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164 def generateThumbnail(self, source_path, size=None, max_age=None, image_uid=None):
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165 """Generate a thumbnail of image
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166
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167 @param source_path(unicode): absolute path to source image
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168 @param size(int, None): max size of the thumbnail
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169 can be one of self.SIZE_*
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170 None to use default value (i.e. self.SIZE_SMALL)
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171 @param max_age(int, None): same as for [memory.cache.Cache.cacheData])
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172 @param image_uid(unicode, None): unique ID to identify the image
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173 use hash whenever possible
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174 if None, source_path will be used
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175 @return D(tuple[tuple[int,int], unicode]): tuple with:
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176 - size of the thumbnail
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177 - unique Id of the thumbnail
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178 """
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179
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180 d = threads.deferToThread(
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181 self._blockingGenThumb, source_path, size, max_age, image_uid=image_uid
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182 )
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183 d.addErrback(
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184 lambda failure_: log.error("thumbnail generation error: {}".format(failure_))
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185 )
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186 return d
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187
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188
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189 @implementer(iwokkel.IDisco)
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190 class XEP_0264_handler(XMPPHandler):
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191
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192 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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193 return [disco.DiscoFeature(NS_THUMBS)]
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194
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195 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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196 return []