verify payload signature if present #2732
Merged
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Verify the payload signature if the request has a signature present in HTTP headers, or if a non-empty secretToken is passed to the ValidatePayload method, indicating that a signature is expected.
This modifies the behavior added in #1127, but not the spirit of what was requested in #1126, which is to support webhooks that don't have configured secrets.
Specifically, this no longer allows signature checking to be skipped entirely, even for webhooks with a configured secret, simply by passing an empty secretToken to ValidatePayload.
This also cleans up some documentation and unused fields in the accompanying test.
Fixes #2731
/cc @myitcv