tweet@obindo.com

Written by Chuck

Post the contents of a message, and any attached photos, to Twitter.

/*!
 * TWEET posts the contents of an email to Twitter
 */

//#region PRIVATE consumer key and secret

var requestTokenUrl = 'https://api.twitter.com/oauth/request_token';
var authRedirectUrl= 'https://api.twitter.com/oauth/authenticate?oauth_token=';
var accessTokenUrl= 'https://api.twitter.com/oauth/access_token';
var tweetUrl= 'https://api.twitter.com/1.1/statuses/update.json';
var uploadUrl= 'https://upload.twitter.com/1.1/media/upload.json';
var sigMethod= 'HMAC-SHA1';
var oAuthVersion= '1.0';

//OAUTH2
function getDefaultParams() {
	return { oauth_consumer_key: consumerKey, oauth_nonce: util.getNonce(), 
             oauth_signature_method: sigMethod, oauth_timestamp: util.getTimeStamp(), 
             oauth_version: oAuthVersion };
}

function getSig(args, action, url, key) {
  var sigBase= action + '&' + util.urlEncode(url) + '&' + util.urlEncode(args);
  return util.getSignature(sigBase, key);
}

function getRequestTokenUrl() {
  var params= getDefaultParams(); 
  params.oauth_callback= oauth2.getCallbackUrl();
  
  var args= util.getQueryArgsFromObject(params);  
  var sig= getSig(args, 'GET', requestTokenUrl, consumerSecret + '&');
  
  return requestTokenUrl + '?' + args + '&oauth_signature=' + sig;
}

function getAccessToken(authResponse) {
  var params= getDefaultParams(); 
  params.oauth_token= authResponse.oauth_token;
  
  var args= util.getQueryArgsFromObject(params);
  var sig= getSig(args, 'POST', accessTokenUrl, consumerSecret + '&' + tokens.requestToken.oauth_token_secret);
  var url= accessTokenUrl + "?" + args + "&oauth_verifier=" + authResponse.oauth_verifier + "&oauth_signature=" + sig;

return post({ url: url, header: { Authorization : 'OAuth' } });
}

oauth2.getAuthRedirectUrl= function(q) {
  var requestUrl= getRequestTokenUrl();
  var response= get(requestUrl);
  
  var t= util.getObjectFromQueryArgs(response.text);
  
  if (q) {
    var o= util.getObjectFromQueryArgs(q);
    if (o.redirect_uri) t.redirect_uri= o.redirect_uri;
  }
  
  tokens.requestToken= t;
  return authRedirectUrl + t.oauth_token;
}

oauth2.onAuthResponse= function(q) {
  var authResponse= util.getObjectFromQueryArgs(q);
  var accessResponse= getAccessToken(authResponse);
  
  tokens.accessToken= util.getObjectFromQueryArgs(accessResponse.text);
  
  if (tokens.requestToken && tokens.requestToken.redirect_uri)
     return tokens.requestToken.redirect_uri;
}

//TWITTER API
function tweet(text, mediaIds) {
  var params= getDefaultParams(); 
  params.oauth_token= tokens.accessToken.oauth_token;
  params.status= text;  
  if (mediaIds) params.media_ids= mediaIds;    
  
  var args= util.getQueryArgsFromObject(params);
  var sig= getSig(args, 'POST', tweetUrl, consumerSecret + '&' + tokens.accessToken.oauth_token_secret);
  
  params.oauth_signature= sig;  
  var authHeader= util.getHeaderArgsFromObject(params);  
  var header= { 'Authorization': 'OAuth ' + authHeader, 
                'Content-Type': 'application/x-www-form-urlencoded'};
  
  var tweetArgs= {status : text};
  if (mediaIds) tweetArgs.media_ids= mediaIds;
  
  var response= post({ url: tweetUrl, header: header,args: tweetArgs });    
  return util.jsonify(response.text);
}

function uploadImage(img) {
  var url= 'https://upload.twitter.com/1.1/media/upload.json';
  var params= getDefaultParams(); 
  params.oauth_token= tokens.accessToken.oauth_token;
  
  var args= util.getQueryArgsFromObject(params);
  var sig= getSig(args, 'POST', url, consumerSecret + '&' + tokens.accessToken.oauth_token_secret);
  
  params.oauth_signature= sig;  
  var header= util.getHeaderArgsFromObject(params);

var response= post({ url: url, 
                       header: { Authorization : 'OAuth ' + header },
                       args: { 'media': img }
                     });
  return util.jsonify(response.text);
}

//UTIL
function getTweet(m, maxLength) {
  var text;
  
  if (m.selections) {
    text= m.selections.tweet;
    return getTweetFromText((text) ? text : '');
  }
    
  text= getTweetFromText(m.text);  
  return (text.length > 0) ? text : getTweetFromText(m.subject);
}

function getTweetFromText(s, maxLength) {
  if (!s || s.length == 0) return '';
  
  var text= s.replace(/\s/g,' '); 
  text= text.replace(/ {2,}/g,' '); //double spaces
  text= (text.length > maxLength) ? text.substring(0,maxLength) : text;
  
  return util.trim(text);  
}

function getMediaIds(images) {
  var arr= [];
  
  for (var i=0; i < images.length; i++) {
    var media= uploadImage(images[i]);
    arr.push(media.media_id_string);
  }
  
  return (arr.length > 0) ? arr.join(',') : null;
}

$(function() {  
  var images= getImages(message);
  var mediaIds= getMediaIds(images);
  var text= getTweet(message, (mediaIds) ? 117 : 140);
  var info= null;
  
  if (text.length > 0 || mediaIds)
    info= tweet(text, mediaIds);
  
  sendConfirm(info);
});