Python, Java Webhook Verification examples

[Ed Vinyard]

My two cents...

The webhook verification example code in the API docs could be improved by making it independent of Django (I think?) and making it clear what the type/content of WEBHOOK_SECRET_TOKEN is.  Perhaps I missed it somewhere, but I can't see where that's specified.

Here are working, standalone examples in Python and Java.  (The following code is in the public domain; do whatever you want with it.)

Python

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import hashlib

import hmac

def webhook_verification(secret_str, message_str):

    '''

    adapted from https://medicidev.drchrono.com/api-docs/#section/Webhooks/Webhooks-verification

    '''

    return hmac.new(

        bytearray(secret_str, 'utf-8'),

        message_str.encode('utf-8'),

        hashlib.sha256

        ).hexdigest()

if __name__ == '__main__':

    msg = 'hello'

    secret = '11223344-5566-7788-9900-aabbccddeeff'

    print(webhook_verification(secret, msg))

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Java

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import java.math.BigInteger;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

public class Main {

    public static void main(String[] args) throws Exception {

        System.out.println(webhookVerification(

            "11223344-5566-7788-9900-aabbccddeeff",

            "hello"));

    }

    static String webhookVerification(String secret, String msg) throws Exception {

        byte[] hmacSha256;

        byte[] secretKey = secret.getBytes("UTF-8");

        byte[] message = msg.getBytes("UTF-8");

        Mac mac = Mac.getInstance("HmacSHA256");

        SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey, "HmacSHA256");

        mac.init(secretKeySpec);

        hmacSha256 = mac.doFinal(message);

        return String.format("%032x", new BigInteger(1, hmacSha256));

    }

}

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Cheers,

Ed

[bri...@drchrono.com]

Appreciate the contribution Ed. 

For anyone else looking for a different webhook setup example, there is also an article listed here: https://developers.drchrono.com/connecting-and-testing-drchrono-webhooks-with-django-and-ngrok-io/, although it is specific to Django as well. The Python code in the article is also updated from the documentation to illustrate Python v3.