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Webhooks and validate HMAC

Chamara Samaranayake
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Apr 20, 2023



I'm trying to execute an AWS Lambda function using the Bitbucket webhooks. I've generated a function url from the Lambda function and configured it as the URL for the webhook. Also setup a secret in the webhook. 


I can successfully execute the Lambda function when I do any code pushes to the repository. I am trying to validate the HMAC using the x-hub-signature header. I'm using Python in my Lambda function. Every time when I compare the hash values they are different. 


Below is what I'm trying in Python. 


def checkSignature(signingSecret, signature, event):
signatureHash = signature.split('=')[1]
digest ='utf-8'), json.dumps(event).encode(), hashlib.sha256).hexdigest()

return hmac.compare_digest(digest, signatureHash)


Any help on what I am doing wrong would be really appreciated. 


Thank you

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