Lambdacast ... podcast rss feed creator with AWS Lambda // upload media files into a bucket, and you are done.

lambdacast.coffee

console.log 'Lambdacast Started'

aws = require 'aws-sdk'
s3 = new aws.S3
  apiVersion: '2006-03-01'

exports.handler = (event, context) ->
  console.log 'Received event:'
  console.log JSON.stringify event, null, '  '

  bucket = event.Records[0].s3.bucket.name
  if event.Records[0].s3.object.key is "rss"
    return context.done null,"ignore rss update"

  s3.listObjects
    Bucket:bucket
    (err,data)->
      if err
        console.log err
      else
#        console.log data
        items=data.Contents.sort (a,b)->
          return if a.LastModified > b.LastModified then 0 else 1
#        console.log items
        xml="""
<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
  <title>Lambdacast</title>
  <link>http://lambdacast.s3w.jp</link>
  <description>Sample Feed for Lambdacast</description>

"""
        for item in items when item.Key isnt "rss"
          xml+="""
  <item>
    <title>#{item.Key}</title>
    <link>http://#{bucket}.s3.amazonaws.com/#{item.Key}</link>
    <description>#{item.Size} Bytes</description>
    <enclosure url="http://#{bucket}.s3.amazonaws.com/#{item.Key}" type="audio/mpeg"/>
    <pubDate>#{item.LastModified}</pubDate>
  </item>

"""
        xml+="""
</channel>
</rss>
"""
#        console.log xml
        s3.putObject
          Bucket:bucket
          Key:'rss'
          Body:xml
          ContentType: 'application/rss+xml'
          (err,data) ->
            if err
              console.log err
              context.done err,xml
            else
              console.log data
              context.done null,xml+data

return

lambdacast.js

(function() {
  var aws, s3;

  console.log('Lambdacast Started');

  aws = require('aws-sdk');

  s3 = new aws.S3({
    apiVersion: '2006-03-01'
  });

  exports.handler = function(event, context) {
    var bucket;
    console.log('Received event:');
    console.log(JSON.stringify(event, null, '  '));
    bucket = event.Records[0].s3.bucket.name;
    if (event.Records[0].s3.object.key === "rss") {
      return context.done(null, "ignore rss update");
    }
    return s3.listObjects({
      Bucket: bucket
    }, function(err, data) {
      var item, items, xml, _i, _len;
      if (err) {
        return console.log(err);
      } else {
        items = data.Contents.sort(function(a, b) {
          if (a.LastModified > b.LastModified) {
            return 0;
          } else {
            return 1;
          }
        });
        xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n<rss version=\"2.0\">\n<channel>\n  <title>Lambdacast</title>\n  <link>http://lambdacast.s3w.jp</link>\n  <description>Sample Feed for Lambdacast</description>\n";
        for (_i = 0, _len = items.length; _i < _len; _i++) {
          item = items[_i];
          if (item.Key !== "rss") {
            xml += "<item>\n  <title>" + item.Key + "</title>\n  <link>http://" + bucket + ".s3.amazonaws.com/" + item.Key + "</link>\n  <description>" + item.Size + " Bytes</description>\n  <enclosure url=\"http://" + bucket + ".s3.amazonaws.com/" + item.Key + "\" type=\"audio/mpeg\"/>\n  <pubDate>" + item.LastModified + "</pubDate>\n</item>\n";
          }
        }
        xml += "</channel>\n</rss>";
        return s3.putObject({
          Bucket: bucket,
          Key: 'rss',
          Body: xml,
          ContentType: 'application/rss+xml'
        }, function(err, data) {
          if (err) {
            console.log(err);
            return context.done(err, xml);
          } else {
            console.log(data);
            return context.done(null, xml + data);
          }
        });
      }
    });
  };

  return;

}).call(this);

rss.xml

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">
<channel>
  <title>Lambdacast</title>
  <link>http://lambdacast.s3w.jp</link>
  <description>Sample Feed for Lambdacast</description>
<item>
  <title>n74.mp3</title>
  <link>http://lambdacast.s3.amazonaws.com/n74.mp3</link>
  <description>3784012 Bytes</description>
  <enclosure url="http://lambdacast.s3.amazonaws.com/n74.mp3" type="audio/mpeg"/>
  <pubDate>Sun Nov 30 2014 10:46:33 GMT-0800 (PST)</pubDate>
</item>
<item>
  <title>sample_mpeg4.mp4</title>
  <link>http://lambdacast.s3.amazonaws.com/sample_mpeg4.mp4</link>
  <description>245779 Bytes</description>
  <enclosure url="http://lambdacast.s3.amazonaws.com/sample_mpeg4.mp4" type="audio/mpeg"/>
  <pubDate>Sun Nov 30 2014 10:29:46 GMT-0800 (PST)</pubDate>
</item>
<item>
  <title>n25.mp3</title>
  <link>http://lambdacast.s3.amazonaws.com/n25.mp3</link>
  <description>2767883 Bytes</description>
  <enclosure url="http://lambdacast.s3.amazonaws.com/n25.mp3" type="audio/mpeg"/>
  <pubDate>Sun Nov 30 2014 10:27:00 GMT-0800 (PST)</pubDate>
</item>
<item>
  <title>n46.mp3</title>
  <link>http://lambdacast.s3.amazonaws.com/n46.mp3</link>
  <description>4486029 Bytes</description>
  <enclosure url="http://lambdacast.s3.amazonaws.com/n46.mp3" type="audio/mpeg"/>
  <pubDate>Sun Nov 30 2014 10:23:45 GMT-0800 (PST)</pubDate>
</item>
</channel>
</rss>

How can i use this coffee script https://github.com/zoomhub/node-deepzoomtools/blob/master/test/index._coffee in lambda?