Twitter App for Gmail with Google Apps Script

This is the full source code for the Gmail Twitter Notifier tool that sends out tweets as new messages arrive in your Gmail Inbox. Written in Google Apps Script.

//  ====================================
//   FOLLOW YOUR GMAIL INBOX ON TWITTER
//  ====================================

//  Google Docs will tweet as new messages arrive in your Gmail
//  See implementation details at http://labnol.org/?p=20990
//  Written by Amit Agarwal (@labnol) on 03/12/2012


//  Get your own Twitter Keys from dev.twitter.com

var TWITTER_CONSUMER_KEY     =  "PLEASE_REPLACE_ME";
var TWITTER_CONSUMER_SECRET  =  "PLEASE_REPLACE_ME_TOO";

//  This script watches your Gmail Inbox for all new messages
//  but you can specify different Gmail filters. For example: 
//  in:inbox is:unread has:attachment to:me

var GMAIL_SEARCH_STRING      =  "in:inbox is:unread";

//  This is the main function. Pleas do not modify this code.

function sendTweet() {    
 var tweet    = "";
 var threadID = "";
 var from     = "";
 var baseURL  = "https://api.twitter.com/1/statuses/update.json?status=";
 var url      = "";
 var status   = "";
 var oauth    = false;
  
 var requestData = {
     "method": "POST",
     "oAuthServiceName": "twitter",
     "oAuthUseToken": "always"
 };
  
 var threads = GmailApp.search(GMAIL_SEARCH_STRING, 0, 20);

 if(!ScriptProperties.getProperty("lastThreadID"))
  ScriptProperties.setProperty("lastThreadID", "0"); 

 for (var i=threads.length-1; i>=0; i--) {
  threadID = threads[i].getId();
 
 if (threadID > ScriptProperties.getProperty("lastThreadID")) {
  ScriptProperties.setProperty("lastThreadID", threadID);     
  from = threads[i].getMessages()[0].getFrom();

  if(from.indexOf(" <") > 0) 
   from = from.substring(0, from.indexOf(" <"));

  url = " https://mail.google.com/mail/#inbox/" + threadID;
  status = from + ": " + threads[i].getFirstMessageSubject();
  tweet = baseURL + encodeURIComponent(status.substr(0,110) + url);

  // Authorize once per session - @labnol
  if (!oauth) {
   authTwitter();
   oauth = true;
  }

  var result = UrlFetchApp.fetch(tweet, requestData);     
  Utilities.sleep(1000);
  }
 }
}

//  The script uses OAuth to connect with your Twitter account
//  Thus, you need not share your login credentials with anyone

function authTwitter() {
 var oauthConfig = UrlFetchApp.addOAuthService("twitter");
 oauthConfig.setAccessTokenUrl("https://api.twitter.com/oauth/access_token");
 oauthConfig.setRequestTokenUrl("https://api.twitter.com/oauth/request_token");
 oauthConfig.setAuthorizationUrl("https://api.twitter.com/oauth/authorize");
 oauthConfig.setConsumerKey(TWITTER_CONSUMER_KEY);
 oauthConfig.setConsumerSecret(TWITTER_CONSUMER_SECRET);
}