Convert Twitter JSON to RSS with Google Apps Script

This Google Script converts the JSON response from the Twitter API to standard RSS feeds. The results are cached for 60 minutes and all requests to Twitter are authenticated with OAuth, an important requirement of the Twitter API v1.1.

function JSONtoRSS(json, type, key) {

oAuth();

var options =
{
"method": "get",
"oAuthServiceName":"twitter",
"oAuthUseToken":"always"
};

try {

    var result = UrlFetchApp.fetch(json, options);

    if (result.getResponseCode() === 200) {

      var tweets = Utilities.jsonParse(result.getContentText());

      if (tweets) {

        var len = tweets.length;

        var rss = "";

        if (len) {

          rss  = '<?xml version="1.0"?><rss version="2.0">';
          rss += ' <channel><title>Twitter ' + type + ': ' + key + '</title>';
          rss += ' <link>' + htmlentities ( json ) + '</link>';
          rss += ' <pubDate>' + new Date() + '</pubDate>';

          for (var i=0; i<len; i++) {

            var sender = tweets[i].user.screen_name;
            var tweet  = htmlentities ( tweets[i].text );

            rss += "<item><title>" + sender + ": " + tweet + "</title>";
            rss += " <author>" + tweets[i].user.name
                            + " (@" + sender + ")</author>";
            rss += " <pubDate>" + tweets[i].created_at + "</pubDate>";
            rss += " <guid isPermaLink='false'>" + tweets[i].id_str + "</guid>";
            rss += " <link>https://twitter.com/" + sender
                            + "/statuses/" + tweets[i].id_str + "</link>";
            rss += " <description>" + tweet + "</description>";
            rss += "</item>";
          }

          rss += "</channel></rss>";

          return rss;
        }
      }
    }

} catch (e) {
Logger.log(e.toString());
}
}

function doGet(e) {

var a = e.parameter.action;
var q = e.parameter.q;

var feed = "https://api.twitter.com/1.1/";

switch (a)
{
case "timeline":
feed += "statuses/user_timeline.json?screen_name=" + q;
break;
case "search":
feed += "search/tweets.json?q=" + encodeURIComponent(q);
break;
case "favorites":
feed += "favorites/list.json?screen_name=" + q;
break;
case "list":
var i = q.split("/");
feed += "lists/statuses.json?slug=" + i[1] + "&owner_screen_name=" + i[0];
break;
default:
feed += "statuses/user_timeline.json";
break;
}

var id = Utilities.base64Encode(feed);

var cache = CacheService.getPublicCache();
var rss = cache.get(id);

if ( ! rss ) {
rss = JSONtoRSS ( feed, a, q );
cache.put(id, rss, 3600);
}

return ContentService.createTextOutput(rss)
.setMimeType(ContentService.MimeType.RSS);
}


export const _frontmatter = {"title":"Convert Twitter JSON to RSS with Google Apps Script","date":"2017-03-19T18:35:22.000Z","slug":"/code/19433-twitter-json-to-rss","category":"Code","tags":["Google Apps Script","Twitter"]}
Amit Agarwal

Amit Agarwal

Google Developer Expert, Google Cloud Champion

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India.

Amit has developed several popular Google add-ons including Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

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