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Fix image uploads being perfectly white when canvas read access is blocked (#11499) 

Fixes #11496
This commit is contained in:
ThibG 2019-08-06 12:08:19 +02:00 committed by Eugen Rochko
parent 27a0d02d0d
commit 111a0628fc
1 changed files with 8 additions and 0 deletions
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8
app/javascript/mastodon/utils/resize_image.js
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@ -67,6 +67,14 @@ const processImage = (img, { width, height, orientation, type = 'image/png' }) =
context.drawImage(img, 0, 0, width, height); 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.every(value => value === 255)) {
throw 'Failed to read from canvas';
}
canvas.toBlob(resolve, type); canvas.toBlob(resolve, type);
}); });