Post media files to Twitter using Google Apps Script

tweet-pic.gs

function getTwitterService() {
  // Check https://github.com/gsuitedevs/apps-script-oauth1#usage
  // for the docs
  return OAuth1.createService('twitter')
      // Set the endpoint URLs.
      .setAccessTokenUrl('https://api.twitter.com/oauth/access_token')
      .setRequestTokenUrl('https://api.twitter.com/oauth/request_token')
      .setAuthorizationUrl('https://api.twitter.com/oauth/authorize')

      // Set the consumer key and secret.
      .setConsumerKey(TWITTER.CONSUMER_KEY)
      .setConsumerSecret(TWITTER.CONSUMER_SECRET)

      // Set the name of the callback function in the script referenced
      // above that should be invoked to complete the OAuth flow.
      .setCallbackFunction('authCallback')

      // Set the property store where authorized tokens should be persisted.
      .setPropertyStore(PropertiesService.getUserProperties());
}


function tweetPicFromURL(url) {
  try {
    var boundary = "cuthere";
    var picture = UrlFetchApp.fetch(url).getBlob().setContentTypeFromExtension();
    var status = "Test status";
    
    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,
          payload: requestBody
        };
    
    
    // twitter stuff
    var api = 'https://api.twitter.com/1.1/statuses/update_with_media.json';
    var twitterService = getTwitterService();
    var response = twitterService.fetch(api, options);
    
    Logger.log(response);
    return response;
  }
  catch(e){Logger.log(e)}
}