Support generation of Presigned URLs in AWS signer

[prasanthj]

What is the underlying problem you're trying to solve?

AWS signer supports presigning but it is only making the signed request valid at a later point in time, essentially setting the x-amz-date to late timestamp.
It will be good if the OPA aws signer can also support generating Presigned URLs. https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-presigned-url.html
This is typically a config in the AWS SDK in the signable request whether to sign or presign. If presign is selected it generates a single URL that contains all the signing related headers encoded in the url.

Describe the ideal solution

Add option in the signer to generate Presigned URLs.

Describe a "Good Enough" solution

Additional Context

[philipaconrad]

If your goal is to generate a string that is the pre-signed URL, I think that might be a good case for a new builtin that simply shares a bunch of the signing logic. 🤔

Maybe something like providers.aws.pre_sign_req?

[stale]

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