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annotate sat/plugins/plugin_xep_0264.py @ 3369:96b2f84a685c

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doc (installation): added instruction to download dev version of `sat_template` Also add double quote to avoid shell interpretation.
author Goffi <goffi@goffi.org>
date Sun, 20 Sep 2020 14:05:40 +0200
parents 4f1fcee83d36
children be6d91572633
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1 #!/usr/bin/env python3
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2
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3 # SàT plugin for managing xep-0264
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5 # Copyright (C) 2014 Emmanuel Gil Peyrot (linkmauve@linkmauve.fr)
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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.log import getLogger
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23
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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 implementer
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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
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35 try:
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36 from PIL import Image, ImageOps
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37 except:
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38 raise exceptions.MissingModule(
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39 "Missing module pillow, please download/install it from https://python-pillow.github.io"
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40 )
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41
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42 #  cf. https://stackoverflow.com/a/23575424
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43 from PIL import ImageFile
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44
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45 ImageFile.LOAD_TRUNCATED_IMAGES = True
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46
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47 try:
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48 from twisted.words.protocols.xmlstream import XMPPHandler
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49 except ImportError:
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50 from wokkel.subprotocols import XMPPHandler
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51
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52
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53 MIME_TYPE = "image/jpeg"
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54 SAVE_FORMAT = "JPEG" # (cf. Pillow documentation)
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55
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56 NS_THUMBS = "urn:xmpp:thumbs:1"
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57
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58 PLUGIN_INFO = {
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59 C.PI_NAME: "XEP-0264",
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60 C.PI_IMPORT_NAME: "XEP-0264",
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61 C.PI_TYPE: "XEP",
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62 C.PI_MODES: C.PLUG_MODE_BOTH,
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63 C.PI_PROTOCOLS: ["XEP-0264"],
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64 C.PI_DEPENDENCIES: ["XEP-0234"],
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65 C.PI_MAIN: "XEP_0264",
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66 C.PI_HANDLER: "yes",
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67 C.PI_DESCRIPTION: _("""Thumbnails handling"""),
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68 }
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69
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70
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71 class XEP_0264(object):
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72 SIZE_SMALL = (320, 320)
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73 SIZE_MEDIUM = (640, 640)
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74 SIZE_BIG = (1280, 1280)
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75 SIZE_FULL_SCREEN = (2560, 2560)
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76 SIZES = (SIZE_SMALL, SIZE_MEDIUM, SIZE_FULL_SCREEN)
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77
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78 def __init__(self, host):
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79 log.info(_("Plugin XEP_0264 initialization"))
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80 self.host = host
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81 host.trigger.add("XEP-0234_buildFileElement", self._addFileThumbnails)
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82 host.trigger.add("XEP-0234_parseFileElement", self._getFileThumbnails)
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83
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84 def getHandler(self, client):
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85 return XEP_0264_handler()
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86
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87 ## triggers ##
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88
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89 def _addFileThumbnails(self, client, file_elt, extra_args):
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90 try:
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91 thumbnails = extra_args["extra"][C.KEY_THUMBNAILS]
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92 except KeyError:
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93 return
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94 for thumbnail in thumbnails:
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95 thumbnail_elt = file_elt.addElement((NS_THUMBS, "thumbnail"))
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96 thumbnail_elt["uri"] = "cid:" + thumbnail["id"]
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97 thumbnail_elt["media-type"] = MIME_TYPE
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98 width, height = thumbnail["size"]
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99 thumbnail_elt["width"] = str(width)
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100 thumbnail_elt["height"] = str(height)
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101 return True
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102
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103 def _getFileThumbnails(self, client, file_elt, file_data):
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104 thumbnails = []
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105 for thumbnail_elt in file_elt.elements(NS_THUMBS, "thumbnail"):
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106 uri = thumbnail_elt["uri"]
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107 if uri.startswith("cid:"):
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108 thumbnail = {"id": uri[4:]}
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109 width = thumbnail_elt.getAttribute("width")
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110 height = thumbnail_elt.getAttribute("height")
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111 if width and height:
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112 try:
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113 thumbnail["size"] = (int(width), int(height))
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114 except ValueError:
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115 pass
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116 try:
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117 thumbnail["mime_type"] = thumbnail_elt["media-type"]
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118 except KeyError:
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119 pass
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120 thumbnails.append(thumbnail)
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121
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122 if thumbnails:
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123 # we want thumbnails ordered from smallest to biggest
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124 thumbnails.sort(key=lambda t: t.get('size', (0, 0)))
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125 file_data.setdefault("extra", {})[C.KEY_THUMBNAILS] = thumbnails
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126 return True
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127
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128 ## thumbnails generation ##
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129
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130 def getThumbId(self, image_uid, size):
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131 """return an ID unique for image/size combination
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132
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133 @param image_uid(unicode): unique id of the image
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134 can be a hash
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135 @param size(tuple(int)): requested size of thumbnail
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136 @return (unicode): unique id for this image/size
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137 """
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138 return hashlib.sha256(repr((image_uid, size)).encode()).hexdigest()
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139
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140 def _blockingGenThumb(
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141 self, source_path, size=None, max_age=None, image_uid=None,
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142 fix_orientation=True):
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143 """Generate a thumbnail for image
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144
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145 This is a blocking method and must be executed in a thread
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146 params are the same as for [generateThumbnail]
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147 """
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148 if size is None:
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149 size = self.SIZE_SMALL
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150 try:
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151 img = Image.open(source_path)
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152 except IOError:
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153 return Failure(exceptions.DataError("Can't open image"))
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154
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155 img.thumbnail(size)
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156 if fix_orientation:
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157 img = ImageOps.exif_transpose(img)
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158
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159 uid = self.getThumbId(image_uid or source_path, size)
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160
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161 with self.host.common_cache.cacheData(
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162 PLUGIN_INFO[C.PI_IMPORT_NAME], uid, MIME_TYPE, max_age
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163 ) as f:
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164 img.save(f, SAVE_FORMAT)
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165 if fix_orientation:
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166 log.debug(f"fixed orientation for {f.name}")
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167
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168 return img.size, uid
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169
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170 def generateThumbnail(
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171 self, source_path, size=None, max_age=None, image_uid=None, fix_orientation=True):
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172 """Generate a thumbnail of image
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173
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174 @param source_path(unicode): absolute path to source image
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175 @param size(int, None): max size of the thumbnail
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176 can be one of self.SIZE_*
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177 None to use default value (i.e. self.SIZE_SMALL)
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178 @param max_age(int, None): same as for [memory.cache.Cache.cacheData])
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179 @param image_uid(unicode, None): unique ID to identify the image
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180 use hash whenever possible
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181 if None, source_path will be used
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182 @param fix_orientation(bool): if True, fix orientation using EXIF data
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183 @return D(tuple[tuple[int,int], unicode]): tuple with:
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184 - size of the thumbnail
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185 - unique Id of the thumbnail
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186 """
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187 d = threads.deferToThread(
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188 self._blockingGenThumb, source_path, size, max_age, image_uid=image_uid,
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189 fix_orientation=fix_orientation
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190 )
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191 d.addErrback(
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192 lambda failure_: log.error("thumbnail generation error: {}".format(failure_))
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193 )
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194 return d
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195
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196
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197 @implementer(iwokkel.IDisco)
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198 class XEP_0264_handler(XMPPHandler):
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199
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200 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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201 return [disco.DiscoFeature(NS_THUMBS)]
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202
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203 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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204 return []