JS to generate OAuth 2.0 Authorization Header

oauth2signing.js

  function createBaseString(ts, nonce, method, uri, host, port) {
    var nl = '\u000A';
    return ts + nl + nonce + nl + method + nl + uri + nl + host + nl + port + nl + nl;
  }

  function generateMAC(method, id, key, hostWithPort, url) {
    var splitHost = hostWithPort.split(':');
    var hostNoPort = splitHost.length > 1 ? splitHost[0] : hostWithPort;
    var port = splitHost.length > 1 ? splitHost[1] : 80;

    var ts = Math.round(new Date().getTime() / 1000);
    var nonce = "n" + Math.round(Math.random() * 10000);

    var base = createBaseString(ts, nonce, method, url, hostNoPort, port);

    var hash = CryptoJS.HmacSHA1(base, key);
    var mac = hash.toString(CryptoJS.enc.Base64);

    return 'MAC id="' + id + '",ts="' + ts + '",nonce="' + nonce + '",mac="' + mac + '"';
  }

  function getAuthHeader(method, params){
    var host = StackMob.getBaseURL();

    var path = params['url'].replace(new RegExp(host, 'g'), '/');
    var sighost = host.replace(new RegExp('^http://|^https://', 'g'), '').replace(new RegExp('/'), '');

    var accessToken = StackMob.Storage.retrieve('oauth2.accessToken');
    var macKey = StackMob.Storage.retrieve('oauth2.macKey');
    var expires = StackMob.Storage.retrieve('oauth2.expires');

    if(StackMob.isOAuth2Mode() && accessToken && macKey) {
      var authHeader = generateMAC(StackMob.METHOD_MAP[method] || 'GET', accessToken, macKey, sighost, path);
      return authHeader;
    }
  }