polaroid

realtime-image-processor.js

const response = event.Records[0].cf.response;

// ...

Sharp(imageBuffer, {
  sequentialRead: true,
  limitInputPixels: 2684026890, // raise default limit to 10x
})
  .resize({
    width: width,
    withoutEnlargement: true,
  })
  .toFormat("jpeg", {
    mozjpeg: true,
    progressive: true,
  })
  .toBuffer()
  .then((processedBuffer) => {
    response.status = 200;
    response.body = processedBuffer.toString("base64");
    response.bodyEncoding = "base64";
    response.headers["content-type"] = [
      { key: "Content-Type", value: "image/jpeg" },
    ];
    response.headers["cache-control"] = [
      { key: "Cache-Control", value: "max-age=31536000" }, // 1 year
    ];
    
    callback(null, response);
  })
  .catch((err) => {
    console.error("Exception while reading source image", err);
    callback(null, response);
  });