Mercurial > libervia-backend

annotate sat/tools/images.py @ 3219:2ba602aef90e

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plugin attach, aesgcm: attachments refactoring: attachment handling has been simplified, and now use a "register" method similar as the ones used for download or upload. A default method (for unencrypted messages) will try a simple upload and will copy the links to body. AESGCM plugin has been adapted to be used for encrypted files. If more than one file is sent with AESGCM plugin, they will be split in several messages as current de-facto standard (OMEMO media sharing) doesn't support several files per message.
author Goffi <goffi@goffi.org>
date Wed, 18 Mar 2020 20:25:02 +0100
parents 5c3bf37f2202
children
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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: a jabber client
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5 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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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 """Methods to manipulate images"""
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21
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22 import tempfile
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23 from PIL import Image
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24 from pathlib import Path
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25 from twisted.internet import threads
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26
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27
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28 def checkImage(host, path, max_size=None):
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29 """Analyze image and return a report
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30
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31 report will indicate if image is too large, and the recommended new size if this is
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32 the case
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33 @param host: SàT instance
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34 @param path(str, pathlib.Path): image to open
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35 @param max_size(tuple[int, int]): maximum accepted size of image
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36 None to use value set in config
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37 @return dict: report on image, with following keys:
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38 - too_large: true if image is oversized
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39 - recommended_size: if too_large is True, recommended size to use
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40 """
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41 report = {}
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42 image = Image.open(path)
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43 if max_size is None:
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44 max_size = tuple(host.memory.getConfig(None, "image_max", (1200, 720)))
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45 if image.size > max_size:
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46 report['too_large'] = True
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47 if image.size[0] > max_size[0]:
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48 factor = max_size[0] / image.size[0]
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49 if image.size[1] * factor > max_size[1]:
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50 factor = max_size[1] / image.size[1]
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51 else:
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52 factor = max_size[1] / image.size[1]
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53 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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54 else:
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55 report['too_large'] = False
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56
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57 return report
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58
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59
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60 def _resizeImageBlocking(image_path, new_size, dest=None):
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61 im_path = Path(image_path)
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62 im = Image.open(im_path)
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63 resized = im.resize(new_size, Image.LANCZOS)
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64
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65 if dest is None:
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66 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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67 elif isinstance(dest, Path):
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68 dest = Path.open('wb')
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69
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70 with dest as f:
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71 resized.save(f, format=im.format)
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72
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73 return Path(f.name)
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75
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76 def resizeImage(image_path, new_size, dest=None):
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77 """Resize an image to a new file, and return its path
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78
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79 @param image_path(str, Path): path of the original image
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80 @param new_size(tuple[int, int]): size to use for new image
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81 @param dest(None, Path, file): where the resized image must be stored, can be:
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82 - None: use a temporary file
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83 - Path: path to the file to create/overwrite
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84 - file: a file object which must be opened for writing in binary mode
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85 @return (Path): path of the resized file.
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86 The image at this path should be deleted after use
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87 """
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88 return threads.deferToThread(_resizeImageBlocking, image_path, new_size, dest)