Commit 111a0628 authored by ThibG's avatar ThibG Committed by Eugen Rochko

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

Fixes #11496
parent 27a0d02d
......@@ -67,6 +67,14 @@ const processImage = (img, { width, height, orientation, type = 'image/png' }) =
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);
});
......
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