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src/util/processAvifImage.js

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+import { createHash } from 'node:crypto';
+import sharp from 'sharp';
+import { rgbaToThumbHash } from 'thumbhash';
+
+const FULL_MAX = 1000;
+const THUMB_MAX = 200;
+
+export default async function processAvifImage(inputBuffer) {
+  const input = Buffer.isBuffer(inputBuffer)
+    ? inputBuffer
+    : Buffer.from(inputBuffer);
+
+  const [full, thumb, thumbRgba] = await Promise.all([
+    sharp(input)
+      .resize(FULL_MAX, FULL_MAX, { fit: 'inside', withoutEnlargement: true })
+      .avif({ effort: 4 })
+      .toBuffer({ resolveWithObject: true }),
+    sharp(input)
+      .resize(THUMB_MAX, THUMB_MAX, { fit: 'inside', withoutEnlargement: true })
+      .avif({ effort: 4 })
+      .toBuffer({ resolveWithObject: true }),
+    sharp(input)
+      .resize(100, 100, { fit: 'inside', withoutEnlargement: true })
+      .ensureAlpha()
+      .raw()
+      .toBuffer({ resolveWithObject: true }),
+  ]);
+
+  const thumbHashBytes = rgbaToThumbHash(
+    thumbRgba.info.width,
+    thumbRgba.info.height,
+    thumbRgba.data,
+  );
+
+  return {
+    full: {
+      w: full.info.width,
+      h: full.info.height,
+      size: full.data.length,
+      buffer: full.data,
+      hash: createHash('sha256').update(full.data).digest('hex'),
+    },
+    thumb: {
+      w: thumb.info.width,
+      h: thumb.info.height,
+      size: thumb.data.length,
+      buffer: thumb.data,
+      hash: Buffer.from(thumbHashBytes).toString('base64'),
+    },
+  };
+}