Google Script Image Upload Twitter

function oAuthConfig() {

  var oAuthConfig = UrlFetchApp.addOAuthService("twitter");
  oAuthConfig.setAccessTokenUrl("http://api.twitter.com/oauth/access_token");
  oAuthConfig.setRequestTokenUrl("http://api.twitter.com/oauth/request_token");
  oAuthConfig.setAuthorizationUrl("http://api.twitter.com/oauth/authorize");
  oAuthConfig.setConsumerKey("consumer");
  oAuthConfig.setConsumerSecret("secret");

}
function postImage() {
  oAuthConfig();
  var boundary = "cuthere";
  var picture = UrlFetchApp.fetch("http://1cak.com/")
                           .getBlob().setContentTypeFromExtension();
  var status = "Tweet text with image upload";
  var requestBody = Utilities.newBlob(
    "--"+boundary+"\r\n"
    + "Content-Disposition: form-data; name=\"status\"\r\n\r\n"
    + status+"\r\n"+"--"+boundary+"\r\n"
    + "Content-Disposition: form-data; name=\"media[]\"; filename=\""+picture.getName()+"\"\r\n"
    + "Content-Type: " + picture.getContentType()+"\r\n\r\n").getBytes();

  requestBody = requestBody.concat(picture.getBytes());
  requestBody = requestBody.concat(Utilities.newBlob("\r\n--"+boundary+"--\r\n").getBytes());

  var options = {
    method: "post",
    contentType: "multipart/form-data; boundary="+boundary,
    oAuthServiceName: "twitter",
    oAuthUseToken: "always",
    payload: requestBody
  };
  var request = UrlFetchApp.fetch("https://api.twitter.com/1.1/statuses/update_with_media.json", options);
}