Kraken API authentication sample converted from python to Google apps script is not returning the same output - authentication

Question

I am trying to convert python kraken API auth to Google Script to use it in a Google Spreadsheet, but with no luck.
# python sample
def get_kraken_signature(urlpath, data, secret):
postdata = urllib.parse.urlencode(data)
encoded = (str(data['nonce']) + postdata).encode()
message = urlpath.encode() + hashlib.sha256(encoded).digest()
mac = hmac.new(base64.b64decode(secret), message, hashlib.sha512)
sigdigest = base64.b64encode(mac.digest())
return sigdigest.decode()
api_sec = "kQH5HW/8p1uGOVjbgWA7FunAmGO8lsSUXNsu3eow76sz84Q18fWxnyRzBHCd3pd5nE9qa99HAZtuZuj6F1huXg=="
data = {
"nonce": "1616492376594",
"ordertype": "limit",
"pair": "XBTUSD",
"price": 37500,
"type": "buy",
"volume": 1.25
}
signature = get_kraken_signature("/0/private/AddOrder", data, api_sec)
print("API-Sign: {}".format(signature))
# prints API-Sign: 4/dpxb3iT4tp/ZCVEwSnEsLxx0bqyhLpdfOpc6fn7OR8+UClSV5n9E6aSS8MPtnRfp32bAb0nmbRn6H8ndwLUQ==
I ended up with this, but it's not returning the same output.
# google script sample from my sheet
function get_kraken_sinature(url, data, nonce, secret) {
var message = url + Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_256, Utilities.base64Encode(nonce + data));
var base64Secret = Utilities.base64Decode(secret);
var mac = Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, message, secret);
return Utilities.base64Encode(mac);
}
signature = get_kraken_signature("/0/private/AddOrder", data, api_sec)
print("API-Sign: {}".format(signature))
# prints API-Sign: Jn6Zk8v41uvMWOY/RTBTrb7zhGxyAOTclFFe7lySodBnEnXErfJgIcQb90opFwccuKDd0Nt1l71HT3V9+P8pUQ==
Both code samples should do the same, and are supposed to output an identical API-Sign key. They are not at this stage, and I am wondering why is that.

Answer 1

I believe your goal is as follows.
You want to convert your python script to Google Apps Script.
In your Google Apps Script, you have already confirmed that the script for requesting works fine. You want to convert get_kraken_signature of your python script to Google Apps Script.
In this case, how about the following modified script?
Modified script:
function get_kraken_sinature(url, data, nonce, secret) {
var str = Object.entries(data).map(([k, v]) => `${k}=${v}`).join("&");
var message = Utilities.newBlob(url).getBytes().concat(Utilities.computeDigest(Utilities.DigestAlgorithm.SHA_256, nonce + str));
var mac = Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_512, message, Utilities.base64Decode(secret));
return Utilities.base64Encode(mac);
}
// Please run this function.
function main() {
const data = {
"nonce": "1616492376594",
"ordertype": "limit",
"pair": "XBTUSD",
"price": 37500,
"type": "buy",
"volume": 1.25
};
var url = "/0/private/AddOrder";
var nonce = "1616492376594";
var secret = "kQH5HW/8p1uGOVjbgWA7FunAmGO8lsSUXNsu3eow76sz84Q18fWxnyRzBHCd3pd5nE9qa99HAZtuZuj6F1huXg==";
var res = get_kraken_sinature(url, data, nonce, secret);
console.log(res)
}
References:
computeDigest(algorithm, value)
computeHmacSignature(algorithm, value, key)