generatePresignedUrls(s3Client, keys, bucket, prefix?, privateBucket?)

Generates pre-signed URLs for uploading objects to S3.

• s3Client: An instance of the S3 client generated by either createS3Client or @aws-sdk/client-s3.
• keys: An array of object keys to upload.
• bucket: The S3 bucket name.
• prefix: (Optional) Prefix for object keys.
• privateBucket: (Optional) Whether the bucket is private. Default is false.
• operation: (Optional) Whether the URLs are for uploading or downloading. Default is upload. For downloading, set to download.
• options: (Optional) Options for the pre-signed URLs. Currently only supports expiresIn in seconds. Default is 3600 (1 hour).

const urls = await generatePresignedUrls(
  s3Client,
  keys,
  bucket,
  prefix,
  privateBucket,
  operation,
  options
);