postman prescript for generate hmac 256 signature

postman-pre-request-script-post.js

/**
 * @author andhikayuana
 */

const moment = require('moment');

function getPath(url) {
    var pathRegex = /.+?\:\/\/.+?(\/.+?)(?:#|\?|$)/;
    var result = url.match(pathRegex);
    return result && result.length > 1 ? result[1] : ''; 
}
 
function getQueryString(url) {
    var arrSplit = url.split('?');
    return arrSplit.length > 1 ? url.substring(url.indexOf('?')+1) : ''; 
}

function getTimestamp() {
    return moment().format('YYYY-MM-DDTHH:mm:ss.SSZ');
}

function generateSignature() {
    const apiKey = pm.environment.get("API_KEY");
    const secretKey = pm.environment.get("SECRET_KEY");
    const queryString = getQueryString(request['url']);
    const fromUrl = queryString.length == 0 ? getPath(request['url']) : `${getPath(request['url'])}?${queryString}`;
    const input = `${request['method']}:${fromUrl}:${apiKey}:${getTimestamp()}`;

    const hash = CryptoJS.HmacSHA256(input, secretKey);
    const hashInBase64 = CryptoJS.enc.Base64.stringify(hash);

    return hashInBase64;
}
 
postman.setEnvironmentVariable("SIGNATURE", generateSignature());
postman.setEnvironmentVariable("TIMESTAMP", getTimestamp());

postman-pre-request-script.js

/**
 * @author andhikayuana
 */

const moment = require('moment');

function getPath(url) {
    var pathRegex = /.+?\:\/\/.+?(\/.+?)(?:#|\?|$)/;
    var result = url.match(pathRegex);
    return result && result.length > 1 ? result[1] : ''; 
}
 
function getQueryString(url) {
    var arrSplit = url.split('?');
    return arrSplit.length > 1 ? url.substring(url.indexOf('?')+1) : ''; 
}

function getTimestamp() {
    return moment().format('YYYY-MM-DDTHH:mm:ss.SSSZ');
}

function generateSignature() {
    const apiKey = pm.environment.get("API_KEY");
    const secretKey = pm.environment.get("SECRET_KEY");
    const queryString = getQueryString(request['url']);
    const fromUrl = queryString.length == 0 ? getPath(request['url']) : `${getPath(request['url'])}?${queryString}`;
    const timestamp = getTimestamp();
    
    postman.setEnvironmentVariable("TIMESTAMP", timestamp);
    
    let input = `${request['method']}:${fromUrl}:${apiKey}:${timestamp}`;

    if (request['method'] == 'POST') {
        const requestData = JSON.stringify(JSON.parse(request['data']));
        input = `${input}:${requestData}`;
    }

    const hash = CryptoJS.HmacSHA256(input, secretKey);
    const hashInBase64 = CryptoJS.enc.Base64.stringify(hash);

    return hashInBase64;
}
 
postman.setEnvironmentVariable("SIGNATURE", generateSignature());