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

Fixes #11496
tags/v2.9.3
ThibG 2 months ago
parent
commit
c69f190af9
1 changed files with 8 additions and 0 deletions
  1. 8
    0
      app/javascript/mastodon/utils/resize_image.js

+ 8
- 0
app/javascript/mastodon/utils/resize_image.js View File

@@ -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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