Altow Almanach

To update metadata like Cache-Control for S3 objects, you have to use the CopyObject method with the MetadataReplace flag set to REPLACE.

import { S3 } from "aws-sdk";
import { CopyObjectRequest } from "aws-sdk/clients/s3";
const s3 = new S3({ region: "eu-central-1" });
async function updateMetadata(bucket: string, key: string) {
  const params: CopyObjectRequest = {
    Bucket: bucket,
    Key: key,
    CopySource: `${bucket}/${key}`,
    MetadataDirective: "REPLACE",
    CacheControl: "max-age=0, s-maxage=3600",
    ContentType: "application/json"
    // ... other metadata
  };
  await s3.copyObject(params).promise();
}

Update s3 metadata