Bitfinex API for Google Apps Script

GasTips / virtual-currency
Google Apps Script / Bitfinex / API

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This sample script is converted this sample script (javascript) to Google Apps Script. The point for converting is signature as shown in the following sample script.

  • At Bitfinex API, after "/api/" + apiPath + nonce + rawBody is encrypted using HMAC SHA-384, the data of byte array is converted to HEX.
    • In Google Apps Script, there is no the method for this.
    • The data which was encrypted by Utilities.computeHmacSignature() is the bytes array of the signed hexadecimal.
    • On the other hand, at this sample script for javascript, the data which was encrypted by crypto.createHmac('sha384', apiSecret).update(signature).digest('hex') is the string of the unsigned hexadecimal.

In order to achieve above, I made the method of bytesToHex().

function bytesToHex(data) {
    return data.map(function(e) {
        var v = (e < 0 ? e + 256 : e).toString(16);
        return v.length == 1 ? "0" + v : v;
    }).join("");
}

function main() {
    const apiKey = '<Your API key here>';
    const apiSecret = '<Your API secret here>';

    const apiPath = "v2/auth/r/alerts";
    const nonce = Date.now().toString();
    const body = { "type": "price" };
    const rawBody = JSON.stringify(body);
    var signature = "/api/" + apiPath + nonce + rawBody;
    signature = Utilities.computeHmacSignature(Utilities.MacAlgorithm.HMAC_SHA_384, signature, apiSecret);
    signature = bytesToHex(signature);
    const url = "https://api.bitfinex.com/" + apiPath;
    const options = {
        method: 'POST',
        contentType: "application/json",
        headers: {
            'bfx-nonce': nonce,
            'bfx-apikey': apiKey,
            'bfx-signature': signature
        },
        payload: rawBody
    };
    var res = UrlFetchApp.fetch(url, options);
    Logger.log(res.getContentText())
}

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