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Update verify_webhook_signature to match more recent security guidelines #9
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See: https://docs.github.com/en/developers/webhooks-and-events/webhooks/securing-your-webhooks The SHA1 algorithm is no longer being used, favoring SHA256 instead, which requires changing which HTTP header to use (going from X-HUB-Signature to X-HUB-Signature-256). A secure comparison is used instead of `==` to help avoid timing attacks.
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See:
https://docs.github.com/en/developers/webhooks-and-events/webhooks/securing-your-webhooks
The SHA1 algorithm is no longer being used, favoring SHA256 instead, which requires changing which HTTP header to use (going from X-HUB-Signature to X-HUB-Signature-256).
A secure comparison is used instead of
==to help avoid timing attacks.