AbstractPreviewTaskHandler.java

    protected void copyFileToS3(File file, String contentType, String bucket, String key) {
        PutObjectRequest request = new PutObjectRequest(bucket, key, file);
        request.setCannedAcl(CannedAccessControlList.Private);
        request.setStorageClass(StorageClass.ReducedRedundancy);
        request.setMetadata(new ObjectMetadata());
        request.getMetadata().setContentType(contentType);
        request.getMetadata().setServerSideEncryption(ObjectMetadata.AES_256_SERVER_SIDE_ENCRYPTION);
        request.getMetadata().setCacheControl(String.format("public, max-age=%d", Duration.standardDays(90).getStandardSeconds()));