server.js

var express = require('express');
var ejs = require('ejs');
var https = require('https');
var memjs = require('memjs');
var path = require('path');


var app = express();
var mc = memjs.Client.create()

app.set('view engine', 'ejs');
app.set('views', __dirname);
app.set('port', process.env.PORT || 3000);
app.use(express.static(path.join(__dirname, 'public'), { maxAge: 31557600000 }));

var processGoogleHTML = function(html) {
  return html
    .replace(/(<script[\s\S]+?<\/script>)/gi, '')
    .replace(/(<div id="header">[\s\S]+?<\/div>)/, '')
    .replace(/(<div id="footer">[\s\S]+?<\/div>)/, '')
};

var generateIframe = function(hash, callback) {
  https.get('https://docs.google.com/document/d/'+hash+'/pub', function(crawled) {
    var html = '';
    crawled.on('data', function(data){
      html = html + data.toString();
    });
    crawled.on('end', function(){
      var result = processGoogleHTML(html);
      mc.set(hash, result, function(err, val) {
        console.log('Wrote', hash);
      }, 30);
      callback(result);
    });
  }).end();
}

var getIframeContent = function(hash, useCache, callback) {
  if (useCache) {
    mc.get(hash, function(err, val) {
      if (val) {
        console.log('Read', hash);
        callback(val.toString())
      } else {
        generateIframe(hash, callback);
      }
    })
  } else {
    generateIframe(hash, callback);
  }
}

app.get('/:hash/raw', function(req, res){
  getIframeContent(req.params.hash, true, function(html){
    res.write(html);
    res.end();
  });
});

app.get('/:hash', function(req, res){
  getIframeContent(req.params.hash, true, function(html){
    res.render('googledoc', {
      title: (html.match(/<title>(.+)<\/title>/i) || [])[0],
      hash: req.params.hash,
    });
  });
});

app.listen(app.get('port'), function() {
  console.log('Express server listening on port %d in %s mode', app.get('port'), app.get('env'));
});