title: restructure string in javascript
body: <p>I have this string in which i need to re-structure using JavaScript.</p>
  
  <blockquote>
    <p>Label=11121212&amp;TopicArn=test&amp;AWSAccountId.member.1=YYYYYYY&amp;ActionName.member.1=createTopic&amp;Action=AddPermission&amp;Version=2010-03-31&amp;<strong>AWSAccessKeyId</strong>=XXXXXXXXX&amp;SignatureVersion=2&amp;SignatureMethod=HmacSHA1&amp;Timestamp=2012-05-02T16%3A06%3A09.000Z&amp;Signature=C3uIh%2Bz%2Fik</p>
  </blockquote>
  
  <p>For this example, <code>AWSAccessKeyId</code> should be the first part of the string and <code>label</code> should be 2nd last. There are others as well, similar to this.</p>
  
  <p>Expected output --AWSAccessKeyId=XXXXXXXXX&amp;AWSAccountId.member.1=YYYYYYYYY&amp;Action=AddPermission&amp;ActionName.member.1=Publish&amp;Label=ios-sns-permission-label&amp;Signature=dEaNL0ibP5c7xyl4qXDPFPADW0meoUX9caKyUIx1wkk%3D&amp;SignatureMethod=HmacSHA256&amp;SignatureVersion=2&amp;Timestamp=2012-05-02T00%3A51%3A23.965Z&amp;TopicArn=arn%3Aaws%3Asns%3Aus-east-1%3A335750469596%3AiOSGoesWooooo-1335919882&amp;Version=2010-03-31</p>
  
  <p>Code that creates this incorrect string</p>
  
  <pre><code>exports.generatePayload = function(params, accessKeyId, secretKey, endpoint) {
      var host = endpoint.replace(/.*:\/\//, "");
      var payload = null;
  
      var signer = new AWSV2Signer(accessKeyId, secretKey);
      params = signer.sign(params, new Date(), {
          "verb" : "POST",
          "host" : host,
          "uriPath" : "/"
      });
  
      var encodedParams = [];
      for(var key in params) {
          if(params[key] !== null) {
              encodedParams.push(encodeURIComponent(key) + "=" + encodeURIComponent(params[key]));
          } else {
              encodedParams.push(encodeURIComponent(key));
          }
      }
      payload = encodedParams.join("&amp;");
      return payload;
  }
  </code></pre>
  
  <p>I tried putting this in an array and restructure it but it didn't work for me.</p>
  
  <p>Please advice how this can be done easily using JavaScript</p>