Twitter Out Of Office Assistant

/*     O U T   O F   O F F I C E   F O R   T W I T T E R    */
/*     - - -   - -   - - - - - -   - - -   - - - - - - -    */



/*     Written by Amit Agarwal http://labnol.org?p=27911    */

/*     For customization and support, see http://ctrlq.org  */

function start() {

  // Please enter dates in YYYY-MM-DD HH:MM format
  
  var OUTOFOFFICE_START_DATE  = "2015/02/15 19:00"; 
  var OUTOFOFFICE_END_DATE    = "2015/02/18 08:00";
  
  // This is your Out-Of-Office reply. Keep it less than 120 characters.
  
  var OUTOFOFFICE_TEXT = "I am currently out of the office until Wed, I'll get back to you then!";    
  
  // Get your Twitter keys from apps.twitter.com
  
  var CONSUMER_KEY     = "YOUR_KEY_HERE";
  var CONSUMER_SECRET  = "YOUR_SECRET_HERE";
  var TWITTER_HANDLE   = "YOUR_HANDLE_HERE";
  
  // Ignore everything after this line
  
  storeKeys( CONSUMER_KEY, CONSUMER_SECRET, OUTOFOFFICE_TEXT, TWITTER_HANDLE );
  
  initialize( OUTOFOFFICE_START_DATE, OUTOFOFFICE_END_DATE );
  
  // Make sure that Twitter oAuth is working
  
  doTwitter();
  
}

function removeTriggers() {
  
  var triggers = ScriptApp.getScriptTriggers();
  
  for(var i=0; i < triggers.length; i++) {
    ScriptApp.deleteTrigger(triggers[i]);
  }
  
}

function storeKeys(key, secret, text, handle) {
  
  var props = PropertiesService.getScriptProperties();
  
  props.setProperty("TWITTER_CONSUMER_KEY",    key);
  props.setProperty("TWITTER_CONSUMER_SECRET", secret);
  
  props.setProperty("OUTOFOFFICE_TEXT", text);  
  props.setProperty("MAX_TWITTER_ID",   0);  
  props.setProperty("TWITTER_HANDLE",   handle);  
  
}


// Setup triggers for the START and END dates

function initialize(start, end) {
  
  var startDate = new Date(start);
  var endDate   = new Date(end);
  
  removeTriggers();
  
  ScriptApp.newTrigger("autoReply")
  .timeBased()
  .at(startDate)
  .create();
  
  ScriptApp.newTrigger("removeTriggers")
  .timeBased()
  .at(endDate)
  .create();
  
} 

function autoReply() {
  
  ScriptApp.newTrigger("outOfOffice")
  .timeBased()
  .everyMinutes(5)
  .create();
  
}

function oAuth() {
  
  var props = PropertiesService.getScriptProperties();
  var oauthConfig = UrlFetchApp.addOAuthService("labnol");
  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(props.getProperty("TWITTER_CONSUMER_KEY"));
  oauthConfig.setConsumerSecret(props.getProperty("TWITTER_CONSUMER_SECRET"));
  
}

// This function will poll twitter every 5 minutes for any @mentions

function outOfOffice() {
  
  oAuth();
  
  var props = PropertiesService.getScriptProperties();
  
  var twitter_handle = props.getProperty("TWITTER_HANDLE");
  
  var phrase = "to:" + twitter_handle;
  var search = "https://api.twitter.com/1.1/search/tweets.json?count=10" 
  + "&include_entities=false&result_type=recent&q="
  + encodeString(phrase) + "&since_id=" 
  + props.getProperty("MAX_TWITTER_ID");
  
  var options =
      {
        "method": "get",
        "oAuthServiceName":"labnol",
        "oAuthUseToken":"always"
      };
  
  var key = "Twitter" + Utilities.formatDate(new Date(), "UTC", 'yw');
  
  try {
    
    var result = UrlFetchApp.fetch(search, options);    
    
    if (result.getResponseCode() === 200) {
      
      var data = Utilities.jsonParse(result.getContentText());
      
      if (data) {
        
        var tweets = data.statuses;
        
        if (tweets.length) {
          
          var db    = props.getProperty(key) || "";
          var reply = props.getProperty("OUTOFOFFICE_TEXT");
          
          for (var i=tweets.length-1; i>=0; i--) {
            
            var sender = "#" + tweets[i].user.screen_name + "#"; 
            if (db.indexOf(sender) == -1) {
              props.setProperty(key, db + sender)
              sendTweet(tweets[i].user.screen_name, tweets[i].id_str, reply, props);
            }
          }
        }
      }
    }    
  } catch (e) {
    Logger.log(e.toString());
  }
}

// If an @mention is found, send an Out of Office tweet to that user.

function sendTweet(user, reply_id, tweet, props) {
  
  var options =
      {
        "method": "POST",
        "oAuthServiceName":"labnol",
        "oAuthUseToken":"always"    
      };
  
  var text = encodeString("@" + user + " " + tweet).substr(0, 140);
  
  var status = "https://api.twitter.com/1.1/statuses/update.json"
  + "?status=" + text + "&in_reply_to_status_id=" + reply_id;
  
  try {
    var result = UrlFetchApp.fetch(status, options);
    props.setProperty("MAX_TWITTER_ID", reply_id);
  }  
  catch (e) {
    Logger.log(e.toString());
  }  
  
}

function doTwitter() {
  
  try {
    
    var req  = "https://api.twitter.com/1.1/application/rate_limit_status.json?resources=search";
    
    var options =
        {
          "method": "get",
          "oAuthServiceName":"labnol",
          "oAuthUseToken":"always"
        };
    
    oAuth();
    
    var result = UrlFetchApp.fetch(req, options);    
    
  } catch (e) {
    throw(e.toString());
  }
}


function encodeString (q) {
  q = q.replace(/\!|\*|\(|\)|\'/g, '');
  return encodeURIComponent(q);
  
  //str = str.replace(/!/g,'%21');
  //str = str.replace(/\*/g,'%2A');
  //str = str.replace(/\(/g,'%28');
  //str = str.replace(/\)/g,'%29');
  //str = str.replace(/'/g,'%27');
  //return str;
  
}