Add authproxy connector HMAC support #2
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The default signature header Gap-Signature is used by Buzzfeed [1].
The upstream hmac library used to calculate the signature is very old (as of writing last update 2017) but it minimizes the work to do here as implementation is trying to match the signing process of Buzzfeed [2].
It seems that signature is not calculated in a standard way; client chooses what to include in the calculation of the signature and the server must use the same input to get a matching signature.
[1] https://github.com/buzzfeed/sso/blob/549155a64d6c5f8916ed909cfa4e340734056284/internal/proxy/oauthproxy.go#L25
[2] https://github.com/buzzfeed/sso/blob/549155a64d6c5f8916ed909cfa4e340734056284/docs/sso_config.md?plain=1#L105
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