Append the image URL for posts from Instagram and Tumblr to a tweet's entities

tweet.entities.media for Instagram etc..

var imageController,
    util = require("util"),
    request = require("request");

imageController = {
    checkForTweetUrlMedia: function (tweet, callback) {
        var url = (tweet.entities && tweet.entities.urls && tweet.entities.urls.length>0) ? tweet.entities.urls[0].expanded_url : false,
        rex = false,
        matchAt = 1;

        // Instagram
        if (url && url.match(/instagr(\.am|am\.com)\/p\//)){
          rex = /<span class="img".+style="background-image: url\((.+)\);/
        }

        // Tumblr
        if (url && url.match(/tmblr\.co/)){
          rex = /http:\/\/[0-9]+\.media\.tumblr\.com\/.+\.(jpg|png)/;
          matchAt = 0;
          console.log('tumblr');
        }


        if (rex){
          request(url, function (error, response, body) {
            if (!error && response.statusCode == 200) {
              var results = rex.exec(body);
              if (results && results.length>1){
                var imageUrl = results[matchAt];
                tweet.entities = tweet.entities || {};
                tweet.entities.media = [];
                tweet.entities.media.push({ media_url: imageUrl });
                return callback(null, tweet); //  we got an error, but we still want the tweet, like!
              }
            }
            //return callback(error, tweet);

          });
        }else{
          console.log('no match for URL ' + url);
          return callback(null, tweet);
        }
    }
};


module.exports = imageController;