Improved XWiki RSS Aggregator Macro

rssaggregator.groovy

{{groovy}}
import java.util.TreeMap;
import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;
import org.apache.commons.codec.binary.Base64

def urls = [];
def entries = new TreeMap();

xcontext.macro.content.eachLine() { urls.add(it.trim()); }

urls.each() { rssUrl ->
  try {
    URL url = new URL(rssUrl);
    URLConnection urlConnection = url.openConnection();
    if (url.getUserInfo() != null) {
        String basicAuth = "Basic " + new String(new Base64().encode(url.getUserInfo().getBytes()));
        urlConnection.setRequestProperty("Authorization", basicAuth);
    }
    InputStream inputStream = urlConnection.getInputStream();
    def feed = new SyndFeedInput().build(new XmlReader(inputStream));
    feed.entries.each() {  entries.put(it.publishedDate, ["entry":it, "feed": feed]); }
  } catch(Exception e) {
    println "There was an error while trying to retrieve RSS feed."
    // Enable for debugging:
    // println e.getMessage()
  }
}
def mysize = entries.keySet().size()
if (mysize >= 1) {
    println """|=Title|=Date|=Author|=Feed"""
    (entries.keySet() as List).reverse()[0..mysize-1].each() { 
       def e = entries.get(it).entry, f = entries.get(it).feed;
       print """|[[{{{${e.title}}}}>>${e.link}]]|{{{${xwiki.formatDate(e.publishedDate)}}}}|"""
       println """{{{${e.author}}}}|[[{{{${f.title}}}}>>${f.link}]]"""
    }
}
{{/groovy}}