AWS offers the ability to sign a url which means you can give us ONLY a url, and we are allowed to upload to that specific location in your bucket. http://docs.aws.amazon.com/AmazonS3/latest/dev/PresignedUrlUploadObject.html.
The benefit of this is that you do not need to give Blitline any permissions to your buckets. The signed url contains all the information necessary.IF you use signed urls you also do not need to set your Canonical ID on Blitline.com, because we do not need it.
Important : You must be able to generate a signed_url on your own. We (Blitline) cannot generate it for you. Most modern AWS SDKs allow for creation of these signed_urls
To use these signed urls with Blitline, the “signed_url” sits within an s3_destination like this:
Remember: If you signed a url with headers, you must include those same headers in the s3_destination