Fix image uploads being perfectly white when canvas read access is blocked (#11499)
Fixes #11496
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@ -67,6 +67,14 @@ const processImage = (img, { width, height, orientation, type = 'image/png' }) =
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context.drawImage(img, 0, 0, width, height);
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// The Tor Browser and maybe other browsers may prevent reading from canvas
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// and return an all-white image instead. Assume reading failed if the resized
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// image is perfectly white.
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const imageData = context.getImageData(0, 0, width, height);
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if (imageData.every(value => value === 255)) {
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throw 'Failed to read from canvas';
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}
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canvas.toBlob(resolve, type);
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});
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