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var KEY = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'; //developer key , get from https://code.google.com/apis/console/b/1/ 
var FILE_ID = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'; // drive file id
function convertDocuments2() {
  
  var oauthConfig = UrlFetchApp.addOAuthService('drive');
  
  //Create oauth config for drive api
  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');  
  //1gC166L6sjPzhKlZB-ux2L7wsqnYn5eZ_bqbe5BjgwSM
  var param = {
    method:'get',
    oAuthServiceName: 'drive',
    oAuthUseToken: 'always',
  };
  
  //Get file 
  var res = UrlFetchApp.fetch('https://www.googleapis.com/drive/v2/files/' + FILE_ID + '?fields=exportLinks&key='+KEY, param);
    
  //this response body format is json , and it has file id. Please see https://developers.google.com/drive/v2/reference/files#resource
  var fileDataResponse = JSON.parse(res.getContentText());
  
  var res = UrlFetchApp.fetch(fileDataResponse.exportLinks["text/html"] + "&key=" + KEY,param);
  
  return res.getContentText();
  
}