A Node.js daemon for achieving TTL behavior of files within a Dropbox directory

app.js

var Log = require('log'),
    log = new Log('info'),
    DropboxClient = require('dropbox').DropboxClient,
    dropbox = new DropboxClient("api_key", "api_secret",
                                "access_token", "access_token_secret");
/**
 * Returns a function that checks the mtime of all files within dir
 * and deletes any that are older than ttl.
 */
function checkForAndRmExpiredItems(dir, ttl) {
  return function() {
    dropbox.getMetadata(dir, function(err, data) {
      if (err) return console.error(err);
      data.contents.forEach(function(elem, index, array) {
        var mtime = new Date(elem.modified).getTime();
        // If item is older than the ttl, delete it.
        if (Date.now() - mtime > ttl) {
          log.info("Deleting: " + elem.path);
          dropbox.deleteItem(elem.path, function(err, data) {
            if (err)
              log.error("Error occurred while attempting delete: " + err);
          });
        }
      });
    });
  }
}

var dirToWatch = "dir-with-expirable-items", // Relative to Dropbox root.
    ttl = 604800000, // 7 days
    interval = 86400; // 24 hours

log.info("Starting Dropbox TTL daemon watching directory(" + dirToWatch +
         ") with ttl(" + ttl + "), at interval(" + interval + ")");
setInterval(
  checkForAndRmExpiredItems(dirToWatch, ttl),
  interval
);