rss.gs

function doGet() {

  // What is the original language of the RSS Feed
  var fromLang = "de";    
  
  // What is the destination language
  var toLang   = "en";    
  
  // Enter the full URL of the RSS feed
  var rssFeed  = "https://notiz.blog/feed/";  
  

  /*


  T U T O R I A L
  - - - - - - - - 
  
  Step 0. Go to File -> Make a Copy to copy this script to your Google Drive.
  Step 1. Update the values of fromLang, toLang and rssFeed fields above.
  Step 2. Go to File -> Manage Versions and Save a new version.
  Step 3. Go to Publish -> Deploy as Web App, choose "Anyone, even Anonymous" under "Who can access the app" and click Deploy.
  
  Google Script will provide a URL of the web app. That's the translated RSS feed which you can subscribe to in your Feed Reader.
  
  Original version by @labnol (https://www.labnol.org/internet/google-translate-rss-feeds/5110/) modified by @pfefferle.

  

  T H E   G E E K Y   S T U F F
  - - -   - - - - -   - - - - -
  
  You can ignore everything that's below this line.  


  */
  
  
  var feed = parseRSS(rssFeed, fromLang, toLang);    
  
  return ContentService.createTextOutput(feed).setMimeType(ContentService.MimeType.RSS);    
}


function parseRSS(feed, fromLang, toLang) {
   
  var id = Utilities.base64Encode(feed + fromLang + toLang);
  
  var cache = CacheService.getPublicCache();
  var rss   = cache.get(id);
  
  if (rss != null) {
    return rss;
  }
  
  var item, title, desc; 
  
  var txt = UrlFetchApp.fetch(feed).getContentText();
  var doc = XmlService.parse(txt);

  var content = XmlService.getNamespace("http://purl.org/rss/1.0/modules/content/");
  var atom = XmlService.getNamespace("http://www.w3.org/2005/Atom");

  var root = doc.getRootElement();
  var channel = root.getChild("channel");

  channel.getChild("title").setText(channel.getChild("title").getText() + " (" + toLang + ")");
  channel.getChild("language").setText(toLang);

  var link = channel.getChild("link").getText();
  link += (link.split("?")[1] ? "&":"?") + "lang=" + toLang;
  channel.getChild("link").setText(link);

  var items = channel.getChildren("item");

  for (var i in items) {
    try {
      item  = items[i];
      
      channel.removeContent(item);

      var title = item.getChild("title").getText();
      var desc  = item.getChild("description").getText();
      var guid  = item.getChild("guid").getText();
      var cont  = item.getChild("encoded", content).getText();
          
      title = LanguageApp.translate(title, fromLang, toLang);
      desc  = LanguageApp.translate(desc,  fromLang, toLang, {contentType: "html"});
      guid += (guid.split("?")[1] ? "&":"?") + "lang=" + toLang;
      cont  = LanguageApp.translate(cont,  fromLang, toLang, {contentType: "html"});

      item.getChild("title").setText(title);
      item.getChild("description").setText(desc);
      item.getChild("guid").setText(guid);
      item.getChild("encoded", content).setText(cont);

      channel.addContent(item);
    } catch (e) {
      Logger.log(e);
    }
  }

  var rss = XmlService.getCompactFormat().setEncoding('UTF-8').format(doc);

  cache.put(id, rss, 3600); // Cache the feed for an hour
  return rss;
}