Run Javascript in Code by Zapier for validating a HMAC signature in a webhook

hmac-validation.js

let crypto = require('crypto');

let secret = inputData.secret;
let webhookBody = inputData.body;
let hmacSignature = inputData.hmacSignature;

let signature = crypto.createHmac('sha256', secret).update(webhookBody).digest("base64");

const validSignature = (signature === hmacSignature);

output = [{isHmacValid: validSignature}];