Mercurial > libervia-backend

annotate libervia/backend/tools/image.py @ 4094:c3b68fdc2de7

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component AP gateway: fix handling of XMPP comments authors: the gateway was supposing that comments where emitted from PEP of author. While this is the case for most blog posts, it's not for comments. Instead the component is now using `author_jid` which is retrieved by XEP-0277 plugin, and reject the item if the auhor is not verified (i.e. if `publisher` attribute is not set by XMPP service).
author Goffi <goffi@goffi.org>
date Mon, 12 Jun 2023 14:50:43 +0200
parents 4b842c1fb686
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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2
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3 # Libervia: an XMPP client
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4 # Copyright (C) 2009-2021 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 """Methods to manipulate images"""
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20
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21 import tempfile
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22 import mimetypes
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23 from PIL import Image, ImageOps
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24 from pathlib import Path
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25 from twisted.internet import threads
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26 from libervia.backend.core.i18n import _
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27 from libervia.backend.core import exceptions
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28 from libervia.backend.core.log import getLogger
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29
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30 log = getLogger(__name__)
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31
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32 try:
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33 import cairosvg
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34 except Exception as e:
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35 log.warning(_("SVG support not available, please install cairosvg: {e}").format(
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36 e=e))
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37 cairosvg = None
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38
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39
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40 def check(host, path, max_size=None):
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41 """Analyze image and return a report
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42
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43 report will indicate if image is too large, and the recommended new size if this is
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44 the case
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45 @param host: SàT instance
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46 @param path(str, pathlib.Path): image to open
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47 @param max_size(tuple[int, int]): maximum accepted size of image
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48 None to use value set in config
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49 @return dict: report on image, with following keys:
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50 - too_large: true if image is oversized
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51 - recommended_size: if too_large is True, recommended size to use
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52 """
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53 report = {}
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54 image = Image.open(path)
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55 if max_size is None:
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56 max_size = tuple(host.memory.config_get(None, "image_max", (1200, 720)))
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57 if image.size > max_size:
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58 report['too_large'] = True
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59 if image.size[0] > max_size[0]:
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60 factor = max_size[0] / image.size[0]
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61 if image.size[1] * factor > max_size[1]:
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62 factor = max_size[1] / image.size[1]
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63 else:
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64 factor = max_size[1] / image.size[1]
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65 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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66 else:
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67 report['too_large'] = False
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68
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69 return report
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70
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71
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72 def _resize_blocking(image_path, new_size, dest, fix_orientation):
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73 im_path = Path(image_path)
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74 im = Image.open(im_path)
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75 resized = im.resize(new_size, Image.LANCZOS)
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76 if fix_orientation:
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77 resized = ImageOps.exif_transpose(resized)
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78
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79 if dest is None:
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80 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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81 elif isinstance(dest, Path):
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82 dest = dest.open('wb')
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83
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84 with dest as f:
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85 resized.save(f, format=im.format)
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86
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87 return Path(f.name)
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88
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89
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90 def resize(image_path, new_size, dest=None, fix_orientation=True):
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91 """Resize an image to a new file, and return its path
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92
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93 @param image_path(str, Path): path of the original image
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94 @param new_size(tuple[int, int]): size to use for new image
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95 @param dest(None, Path, file): where the resized image must be stored, can be:
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96 - None: use a temporary file
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97 file will be converted to PNG
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98 - Path: path to the file to create/overwrite
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99 - file: a file object which must be opened for writing in binary mode
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100 @param fix_orientation: if True, use EXIF data to set orientation
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101 @return (Path): path of the resized file.
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102 The image at this path should be deleted after use
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103 """
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104 return threads.deferToThread(
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105 _resize_blocking, image_path, new_size, dest, fix_orientation)
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106
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107
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108 def _convert_blocking(image_path, dest, extra):
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109 media_type = mimetypes.guess_type(str(image_path), strict=False)[0]
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110
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111 if dest is None:
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112 dest = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
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113 filepath = Path(dest.name)
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114 elif isinstance(dest, Path):
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115 filepath = dest
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116 else:
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117 # we should have a file-like object
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118 try:
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119 name = dest.name
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120 except AttributeError:
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121 name = None
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122 if name:
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123 try:
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124 filepath = Path(name)
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125 except TypeError:
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126 filepath = Path('noname.png')
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127 else:
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128 filepath = Path('noname.png')
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129
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
130 if media_type == "image/svg+xml":
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
131 if cairosvg is None:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
132 raise exceptions.MissingModule(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
133 f"Can't convert SVG image at {image_path} due to missing CairoSVG module")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
134 width, height = extra.get('width'), extra.get('height')
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
135 cairosvg.svg2png(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
136 url=str(image_path), write_to=dest,
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
137 output_width=width, output_height=height
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
138 )
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
139 else:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
140 suffix = filepath.suffix
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
141 if not suffix:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
142 raise ValueError(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
143 "A suffix is missing for destination, it is needed to determine file "
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
144 "format")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
145 if not suffix in Image.EXTENSION:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
146 Image.init()
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
147 try:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
148 im_format = Image.EXTENSION[suffix]
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
149 except KeyError:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
150 raise ValueError(
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
151 "Dest image format can't be determined, {suffix!r} suffix is unknown"
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
152 )
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
153 im = Image.open(image_path)
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
154 im.save(dest, format=im_format)
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
155
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
156 log.debug(f"image {image_path} has been converted to {filepath}")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
157 return filepath
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
158
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
159
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
160 def convert(image_path, dest=None, extra=None):
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
161 """Convert an image to a new file, and return its path
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
162
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
163 @param image_path(str, Path): path of the image to convert
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
164 @param dest(None, Path, file): where the converted image must be stored, can be:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
165 - None: use a temporary file
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
166 - Path: path to the file to create/overwrite
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
167 - file: a file object which must be opened for writing in binary mode
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
168 @param extra(None, dict): conversion options
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
169 if image_path link to a SVG file, following options can be used:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
170 - width: destination width
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
171 - height: destination height
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
172 @return (Path): path of the converted file.
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
173 a generic name is used if dest is an unnamed file like object
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
174 """
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
175 image_path = Path(image_path)
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
176 if not image_path.is_file():
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
177 raise ValueError(f"There is no file at {image_path}!")
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
178 if extra is None:
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
179 extra = {}
3332
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
180 return threads.deferToThread(_convert_blocking, image_path, dest, extra)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
181
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
182
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
183 def __fix_orientation_blocking(image_path):
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
184 im = Image.open(image_path)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
185 im_format = im.format
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
186 exif = im.getexif()
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
187 orientation = exif.get(0x0112)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
188 if orientation is None or orientation<2:
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
189 # nothing to do
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
190 return False
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
191 im = ImageOps.exif_transpose(im)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
192 im.save(image_path, im_format)
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
193 log.debug(f"image {image_path} orientation has been fixed")
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
194 return True
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
195
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
196
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
197 def fix_orientation(image_path: Path) -> bool:
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
198 """Apply orientation found in EXIF data if any
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
199
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
200 @param image_path: image location, image will be modified in place
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
201 @return True if image has been modified
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
202 """
1512cbd6c4ac tools (image): fix_orientation on resize + `fix_orientation` method:
Goffi <goffi@goffi.org>
parents: 3259
diff changeset
203 return threads.deferToThread(__fix_orientation_blocking, image_path)
3259
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
204
f300d78f08f3 core: image convertion + SVG support:
Goffi <goffi@goffi.org>
parents: 3252
diff changeset
205
3252
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
206 def guess_type(source):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
207 """Guess image media type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
208
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
209 @param source(str, Path, file): image to guess type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
210 @return (str, None): media type, or None if we can't guess
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
211 """
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
212 if isinstance(source, str):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
213 source = Path(source)
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
214
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
215 if isinstance(source, Path):
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
216 # we first try to guess from file name
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
217 media_type = mimetypes.guess_type(source, strict=False)[0]
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
218 if media_type is not None:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
219 return media_type
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
220
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
221 # file name is not enough, we try to open it
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
222 img = Image.open(source)
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
223 try:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
224 return Image.MIME[img.format]
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
225 except KeyError:
54934ee3f69c tools (image): added a guess_type method to guess media type:
Goffi <goffi@goffi.org>
parents: 3220
diff changeset
226 return None