mirror of
https://github.com/lunaisnotaboy/mastodon.git
synced 2024-12-17 02:45:59 +00:00
4e9794f533
Port f178a01c11
to glitch-soc
Signed-off-by: Thibaut Girka <thib@sitedethib.com>
115 lines
3.2 KiB
JavaScript
115 lines
3.2 KiB
JavaScript
import EXIF from 'exif-js';
|
|
|
|
const MAX_IMAGE_PIXELS = 1638400; // 1280x1280px
|
|
|
|
const getImageUrl = inputFile => new Promise((resolve, reject) => {
|
|
if (window.URL && URL.createObjectURL) {
|
|
try {
|
|
resolve(URL.createObjectURL(inputFile));
|
|
} catch (error) {
|
|
reject(error);
|
|
}
|
|
return;
|
|
}
|
|
|
|
const reader = new FileReader();
|
|
reader.onerror = (...args) => reject(...args);
|
|
reader.onload = ({ target }) => resolve(target.result);
|
|
|
|
reader.readAsDataURL(inputFile);
|
|
});
|
|
|
|
const loadImage = inputFile => new Promise((resolve, reject) => {
|
|
getImageUrl(inputFile).then(url => {
|
|
const img = new Image();
|
|
|
|
img.onerror = (...args) => reject(...args);
|
|
img.onload = () => resolve(img);
|
|
|
|
img.src = url;
|
|
}).catch(reject);
|
|
});
|
|
|
|
const getOrientation = (img, type = 'image/png') => new Promise(resolve => {
|
|
if (!['image/jpeg', 'image/webp'].includes(type)) {
|
|
resolve(1);
|
|
return;
|
|
}
|
|
|
|
EXIF.getData(img, () => {
|
|
const orientation = EXIF.getTag(img, 'Orientation');
|
|
resolve(orientation);
|
|
});
|
|
});
|
|
|
|
const processImage = (img, { width, height, orientation, type = 'image/png' }) => new Promise(resolve => {
|
|
const canvas = document.createElement('canvas');
|
|
|
|
if (4 < orientation && orientation < 9) {
|
|
canvas.width = height;
|
|
canvas.height = width;
|
|
} else {
|
|
canvas.width = width;
|
|
canvas.height = height;
|
|
}
|
|
|
|
const context = canvas.getContext('2d');
|
|
|
|
switch (orientation) {
|
|
case 2: context.transform(-1, 0, 0, 1, width, 0); break;
|
|
case 3: context.transform(-1, 0, 0, -1, width, height); break;
|
|
case 4: context.transform(1, 0, 0, -1, 0, height); break;
|
|
case 5: context.transform(0, 1, 1, 0, 0, 0); break;
|
|
case 6: context.transform(0, 1, -1, 0, height, 0); break;
|
|
case 7: context.transform(0, -1, -1, 0, height, width); break;
|
|
case 8: context.transform(0, -1, 1, 0, 0, width); break;
|
|
}
|
|
|
|
context.drawImage(img, 0, 0, width, height);
|
|
|
|
// The Tor Browser and maybe other browsers may prevent reading from canvas
|
|
// and return an all-white image instead. Assume reading failed if the resized
|
|
// image is perfectly white.
|
|
const imageData = context.getImageData(0, 0, width, height);
|
|
if (imageData.data.every(value => value === 255)) {
|
|
throw 'Failed to read from canvas';
|
|
}
|
|
|
|
canvas.toBlob(resolve, type);
|
|
});
|
|
|
|
const resizeImage = (img, type = 'image/png') => new Promise((resolve, reject) => {
|
|
const { width, height } = img;
|
|
|
|
const newWidth = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (width / height)));
|
|
const newHeight = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (height / width)));
|
|
|
|
getOrientation(img, type)
|
|
.then(orientation => processImage(img, {
|
|
width: newWidth,
|
|
height: newHeight,
|
|
orientation,
|
|
type,
|
|
}))
|
|
.then(resolve)
|
|
.catch(reject);
|
|
});
|
|
|
|
export default inputFile => new Promise((resolve, reject) => {
|
|
if (!inputFile.type.match(/image.*/) || inputFile.type === 'image/gif') {
|
|
resolve(inputFile);
|
|
return;
|
|
}
|
|
|
|
loadImage(inputFile).then(img => {
|
|
if (img.width * img.height < MAX_IMAGE_PIXELS) {
|
|
resolve(inputFile);
|
|
return;
|
|
}
|
|
|
|
resizeImage(img, inputFile.type)
|
|
.then(resolve)
|
|
.catch(() => resolve(inputFile));
|
|
}).catch(reject);
|
|
});
|