Log JWT token in headers returned from AWS Cognito

[jeremych1000]

Hello,

I've been using this signing proxy in our workflow successfully, which looks something like this:
AWS ALB --> SAML authentication via AWS Cognito --> aws-es-proxy --> AWS ElasticSearch / Kibana

I wish to log exactly who has made the request.

Therefore, I've turned on verbose logging, but want to access the headers of the request, especially X-Amzn-Oidc-Data [1], as this is a JWT token that includes information from the person that issued the request, i.e. name, email, etc. in the JWT payload.

From [1],

The JWT payload is a JSON object that contains the user claims received from the IdP user info endpoint.

{
   "sub": "1234567890",
   "name": "name",
   "email": "alias@example.com",
   ...
}

Is this possible to do in this proxy, given you already read the headers here?
https://github.com/abutaha/aws-es-proxy/blob/master/aws-es-proxy.go#L284

[1] https://docs.aws.amazon.com/elasticloadbalancing/latest/application/listener-authenticate-users.html#user-claims-encoding

Thanks :)

[jeremych1000]

I've merged a PR in our fork which enables this, but it's a custom solution for our problem and set up (ALB with Cognito integration). It works well.

Any ideas on how I can make the PR generic so it can be merged in this repo?

master...OakNorthAI:master