xls attached to google spreadsheet

DriveUpload.js

function uploadXls(file) {
  authorize();
  var key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; // <-- developer key
  var metadata = { title: file.getName() }
  var params = {method:"post",
                oAuthServiceName: "drive",
                oAuthUseToken: "always",
                contentType: "application/vnd.ms-excel",
                contentLength: file.getBytes().length,
                payload: file.getBytes()
               };
  // convert=true convert xls to google spreadsheet
  var uploadRequest = UrlFetchApp.fetch("https://www.googleapis.com/upload/drive/v2/files/?uploadType=media&convert=true&key="+key, params);
  var uploadResponse = Utilities.jsonParse(uploadRequest.getContentText());
  var params = {method:"put",
                oAuthServiceName: "drive",
                oAuthUseToken: "always",
                contentType: "application/json",
                payload: Utilities.jsonStringify(metadata)
               };
  var metaRequest = UrlFetchApp.fetch("https://www.googleapis.com/drive/v2/files/"+uploadResponse.id+"?key="+key, params)
  return DocsList.getFileById(uploadResponse.id);
}

function authorize() {
  var oauthConfig = UrlFetchApp.addOAuthService("drive");
  var scope = "https://www.googleapis.com/auth/drive";
  oauthConfig.setConsumerKey("anonymous");
  oauthConfig.setConsumerSecret("anonymous");
  oauthConfig.setRequestTokenUrl("https://www.google.com/accounts/OAuthGetRequestToken?scope="+scope);
  oauthConfig.setAuthorizationUrl("https://accounts.google.com/OAuthAuthorizeToken");    
  oauthConfig.setAccessTokenUrl("https://www.google.com/accounts/OAuthGetAccessToken");  
}

function processInbox() {
  // get all threads in inbox
  var threads = GmailApp.getInboxThreads();
  for (var i = 0; i < threads.length; i++) {
    // get all messages in a given thread
    var messages = threads[i].getMessages();
    // iterate over each message
    for (var j = 0; j < messages.length; j++) {
      // log message subject
      var subject = messages[j].getSubject()
      //Logger.log(subject);
      if ( subject == "with xls attach" ){
        Logger.log(messages[j].getSubject());
        var attach = messages[j].getAttachments()[0];
        var name = attach.getName();
        var type = attach.getContentType();
        //var data = attach.getDataAsString();
        Logger.log( name + " " + type + " " );
        var file = uploadXls(attach);
        SpreadsheetApp.open(file);
      }
    }
  }
};