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annotate libervia/backend/tools/image.py @ 4340:ea72364131d5 default tip @

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doc (components): Update Email Gateway documentation: A section has been added to explain how attachments are handled. fix 453
author Goffi <goffi@goffi.org>
date Tue, 03 Dec 2024 00:53:18 +0100
parents 0d7bb4df2343
children
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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(e=e))
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36 cairosvg = None
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37
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38
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39 def check(host, path, max_size=None):
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40 """Analyze image and return a report
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41
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42 report will indicate if image is too large, and the recommended new size if this is
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43 the case
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44 @param host: SàT instance
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45 @param path(str, pathlib.Path): image to open
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46 @param max_size(tuple[int, int]): maximum accepted size of image
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47 None to use value set in config
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48 @return dict: report on image, with following keys:
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49 - too_large: true if image is oversized
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50 - recommended_size: if too_large is True, recommended size to use
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51 """
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52 report = {}
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53 image = Image.open(path)
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54 if max_size is None:
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55 max_size = tuple(host.memory.config_get(None, "image_max", (1200, 720)))
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56 if image.size > max_size:
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57 report["too_large"] = True
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58 if image.size[0] > max_size[0]:
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59 factor = max_size[0] / image.size[0]
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60 if image.size[1] * factor > max_size[1]:
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61 factor = max_size[1] / image.size[1]
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62 else:
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63 factor = max_size[1] / image.size[1]
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64 report["recommended_size"] = [
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65 int(image.width * factor),
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66 int(image.height * factor),
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67 ]
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68 else:
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69 report["too_large"] = False
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70
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71 return report
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72
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73
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74 def _resize_blocking(image_path, new_size, dest, fix_orientation):
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75 im_path = Path(image_path)
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76 im = Image.open(im_path)
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77 resized = im.resize(new_size, Image.LANCZOS)
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78 if fix_orientation:
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79 resized = ImageOps.exif_transpose(resized)
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80
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81 if dest is None:
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82 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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83 elif isinstance(dest, Path):
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84 dest = dest.open("wb")
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85
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86 with dest as f:
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87 resized.save(f, format=im.format)
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88
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89 return Path(f.name)
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90
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91
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92 def resize(image_path, new_size, dest=None, fix_orientation=True):
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93 """Resize an image to a new file, and return its path
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94
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95 @param image_path(str, Path): path of the original image
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96 @param new_size(tuple[int, int]): size to use for new image
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97 @param dest(None, Path, file): where the resized image must be stored, can be:
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98 - None: use a temporary file
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99 file will be converted to PNG
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100 - Path: path to the file to create/overwrite
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101 - file: a file object which must be opened for writing in binary mode
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102 @param fix_orientation: if True, use EXIF data to set orientation
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103 @return (Path): path of the resized file.
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104 The image at this path should be deleted after use
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105 """
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106 return threads.deferToThread(
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107 _resize_blocking, image_path, new_size, dest, fix_orientation
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108 )
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109
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110
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111 def _convert_blocking(image_path, dest, extra):
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112 media_type = mimetypes.guess_type(str(image_path), strict=False)[0]
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113
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114 if dest is None:
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115 dest = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
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116 filepath = Path(dest.name)
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117 elif isinstance(dest, Path):
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118 filepath = dest
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119 else:
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120 # we should have a file-like object
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121 try:
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122 name = dest.name
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123 except AttributeError:
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124 name = None
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125 if name:
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126 try:
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127 filepath = Path(name)
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128 except TypeError:
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129 filepath = Path("noname.png")
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130 else:
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131 filepath = Path("noname.png")
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132
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133 if media_type == "image/svg+xml":
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134 if cairosvg is None:
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135 raise exceptions.MissingModule(
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136 f"Can't convert SVG image at {image_path} due to missing CairoSVG module"
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137 )
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138 width, height = extra.get("width"), extra.get("height")
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139 cairosvg.svg2png(
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140 url=str(image_path), write_to=dest, output_width=width, output_height=height
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141 )
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142 else:
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143 suffix = filepath.suffix
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144 if not suffix:
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145 raise ValueError(
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146 "A suffix is missing for destination, it is needed to determine file "
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147 "format"
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148 )
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149 if not suffix in Image.EXTENSION:
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150 Image.init()
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151 try:
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152 im_format = Image.EXTENSION[suffix]
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153 except KeyError:
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154 raise ValueError(
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155 "Dest image format can't be determined, {suffix!r} suffix is unknown"
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156 )
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157 im = Image.open(image_path)
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158 im.save(dest, format=im_format)
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159
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160 log.debug(f"image {image_path} has been converted to {filepath}")
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161 return filepath
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162
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163
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164 def convert(image_path, dest=None, extra=None):
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165 """Convert an image to a new file, and return its path
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166
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167 @param image_path(str, Path): path of the image to convert
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168 @param dest(None, Path, file): where the converted image must be stored, can be:
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169 - None: use a temporary file
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170 - Path: path to the file to create/overwrite
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171 - file: a file object which must be opened for writing in binary mode
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172 @param extra(None, dict): conversion options
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173 if image_path link to a SVG file, following options can be used:
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174 - width: destination width
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175 - height: destination height
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176 @return (Path): path of the converted file.
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177 a generic name is used if dest is an unnamed file like object
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178 """
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179 image_path = Path(image_path)
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180 if not image_path.is_file():
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181 raise ValueError(f"There is no file at {image_path}!")
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182 if extra is None:
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183 extra = {}
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184 return threads.deferToThread(_convert_blocking, image_path, dest, extra)
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185
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186
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187 def __fix_orientation_blocking(image_path):
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188 im = Image.open(image_path)
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189 im_format = im.format
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190 exif = im.getexif()
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191 orientation = exif.get(0x0112)
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192 if orientation is None or orientation < 2:
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193 # nothing to do
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194 return False
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195 im = ImageOps.exif_transpose(im)
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196 im.save(image_path, im_format)
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197 log.debug(f"image {image_path} orientation has been fixed")
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198 return True
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199
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200
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201 def fix_orientation(image_path: Path) -> bool:
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202 """Apply orientation found in EXIF data if any
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203
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204 @param image_path: image location, image will be modified in place
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205 @return True if image has been modified
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206 """
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207 return threads.deferToThread(__fix_orientation_blocking, image_path)
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208
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209
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210 def guess_type(source):
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211 """Guess image media type
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212
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213 @param source(str, Path, file): image to guess type
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214 @return (str, None): media type, or None if we can't guess
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215 """
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216 if isinstance(source, str):
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217 source = Path(source)
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218
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219 if isinstance(source, Path):
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220 # we first try to guess from file name
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221 media_type = mimetypes.guess_type(source, strict=False)[0]
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222 if media_type is not None:
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223 return media_type
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224
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225 # file name is not enough, we try to open it
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226 img = Image.open(source)
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227 try:
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228 return Image.MIME[img.format]
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229 except KeyError:
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230 return None