Mercurial > libervia-backend
annotate sat/plugins/plugin_xep_0264.py @ 2641:b42aa52d2621 0.7.0a2
0.7.0a2 release
author | Goffi <goffi@goffi.org> |
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date | Sun, 08 Jul 2018 18:38:29 +0200 |
parents | 56f94936df1e |
children | 003b8b4b56a7 |
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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 |
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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 implements |
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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 u"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 = u"image/jpeg" |
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55 SAVE_FORMAT = u"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 = (250, 250) |
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74 SIZE_MEDIUM = (1024, 1024) |
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75 |
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76 def __init__(self, host): |
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77 log.info(_(u"Plugin XEP_0264 initialization")) |
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78 self.host = host |
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79 host.trigger.add("XEP-0234_buildFileElement", self._addFileThumbnails) |
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80 host.trigger.add("XEP-0234_parseFileElement", self._getFileThumbnails) |
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81 |
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82 def getHandler(self, client): |
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83 return XEP_0264_handler() |
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84 |
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85 ## triggers ## |
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86 |
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87 def _addFileThumbnails(self, file_elt, extra_args): |
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88 try: |
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89 thumbnails = extra_args[u"extra"][C.KEY_THUMBNAILS] |
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90 except KeyError: |
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91 return |
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92 for thumbnail in thumbnails: |
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93 thumbnail_elt = file_elt.addElement((NS_THUMBS, u"thumbnail")) |
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94 thumbnail_elt["uri"] = u"cid:" + thumbnail["id"] |
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95 thumbnail_elt["media-type"] = MIME_TYPE |
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96 width, height = thumbnail["size"] |
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97 thumbnail_elt["width"] = unicode(width) |
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98 thumbnail_elt["height"] = unicode(height) |
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99 return True |
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100 |
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101 def _getFileThumbnails(self, file_elt, file_data): |
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102 thumbnails = [] |
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103 for thumbnail_elt in file_elt.elements(NS_THUMBS, u"thumbnail"): |
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104 uri = thumbnail_elt["uri"] |
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105 if uri.startswith("cid:"): |
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106 thumbnail = {"id": uri[4:]} |
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107 width = thumbnail_elt.getAttribute("width") |
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108 height = thumbnail_elt.getAttribute("height") |
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109 if width and height: |
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110 try: |
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111 thumbnail["size"] = int(width), int(height) |
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112 except ValueError: |
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113 pass |
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114 try: |
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115 thumbnail["mime_type"] = thumbnail_elt["media-type"] |
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116 except KeyError: |
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117 pass |
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118 thumbnails.append(thumbnail) |
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119 |
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120 if thumbnails: |
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121 file_data.setdefault("extra", {})[C.KEY_THUMBNAILS] = thumbnails |
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122 return True |
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123 |
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124 ## thumbnails generation ## |
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125 |
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126 def getThumbId(self, image_uid, size): |
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127 """return an ID unique for image/size combination |
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128 |
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129 @param image_uid(unicode): unique id of the image |
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130 can be a hash |
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131 @param size(tuple(int)): requested size of thumbnail |
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132 @return (unicode): unique id for this image/size |
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133 """ |
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134 return hashlib.sha256(repr((image_uid, size))).hexdigest() |
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135 |
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136 def _blockingGenThumb(self, source_path, size=None, max_age=None, image_uid=None): |
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137 """Generate a thumbnail for image |
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138 |
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139 This is a blocking method and must be executed in a thread |
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140 params are the same as for [generateThumbnail] |
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141 """ |
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142 if size is None: |
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143 size = self.SIZE_SMALL |
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144 try: |
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145 img = Image.open(source_path) |
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146 except IOError: |
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147 return Failure(exceptions.DataError(u"Can't open image")) |
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148 |
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149 img.thumbnail(size) |
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150 uid = self.getThumbId(image_uid or source_path, size) |
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151 |
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152 with self.host.common_cache.cacheData( |
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153 PLUGIN_INFO[C.PI_IMPORT_NAME], uid, MIME_TYPE, max_age |
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154 ) as f: |
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155 img.save(f, SAVE_FORMAT) |
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156 |
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157 return img.size, uid |
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158 |
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159 def generateThumbnail(self, source_path, size=None, max_age=None, image_uid=None): |
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160 """Generate a thumbnail of image |
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161 |
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162 @param source_path(unicode): absolute path to source image |
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163 @param size(int, None): max size of the thumbnail |
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164 can be one of self.SIZE_* |
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165 None to use default value (i.e. self.SIZE_SMALL) |
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166 @param max_age(int, None): same as for [memory.cache.Cache.cacheData]) |
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167 @param image_uid(unicode, None): unique ID to identify the image |
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168 use hash whenever possible |
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169 if None, source_path will be used |
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170 @return D(tuple[tuple[int,int], unicode]): tuple with: |
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171 - size of the thumbnail |
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172 - unique Id of the thumbnail |
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173 """ |
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174 |
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175 d = threads.deferToThread( |
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176 self._blockingGenThumb, source_path, size, max_age, image_uid=image_uid |
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177 ) |
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178 d.addErrback( |
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179 lambda failure_: log.error(u"thumbnail generation error: {}".format(failure_)) |
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180 ) |
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181 return d |
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182 |
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183 |
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184 class XEP_0264_handler(XMPPHandler): |
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185 implements(iwokkel.IDisco) |
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186 |
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187 def getDiscoInfo(self, requestor, target, nodeIdentifier=""): |
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188 return [disco.DiscoFeature(NS_THUMBS)] |
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189 |
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190 def getDiscoItems(self, requestor, target, nodeIdentifier=""): |
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191 return [] |