requisite/lib/middleware.js

A cosmic javascript bundler.

// Generated by CoffeeScript 1.7.1
var bundle, dirname, join, parse, _ref;

_ref = require('path'), dirname = _ref.dirname, join = _ref.join;

parse = require('url').parse;

bundle = require('./bundle');

module.exports = function(opts) {
  var cached, maxAge, middleware;
  if (opts == null) {
    opts = {};
  }
  maxAge = opts.maxAge || 0;
  cached = null;
  middleware = function(req, res, next) {
    var now, path, url;
    url = parse(req.url, true, true);
    path = url.pathname.replace(/\.\w+$/, '');
    if (cached == null) {
      if (opts.urlRoot == null) {
        opts.urlRoot = dirname(req.originalUrl);
      }
      if (opts.entry == null) {
        opts.entry = path;
      }
      bundle(opts, function(err, _bundle) {
        if (err != null) {
          return next(err);
        }
        cached = _bundle;
        return middleware(req, res, next);
      });
      return;
    }
    now = new Date().toUTCString();
    if (!res.getHeader('Date')) {
      res.setHeader('Date', now);
    }
    if (!res.getHeader('Cache-Control')) {
      res.setHeader('Cache-Control', 'public, max-age=' + (maxAge / 1000));
    }
    if (!res.getHeader('Last-Modified')) {
      res.setHeader('Last-Modified', now);
    }
    res.setHeader('Content-Type', 'application/javascript; charset=UTF-8');
    if (req.method === 'HEAD') {
      res.writeHead(200);
      return res.end();
    }
    if (req.method !== 'GET') {
      return next();
    }
    return cached.parse({
      deep: true
    }, function(err) {
      var mod;
      if (err != null) {
        return next(err);
      }
      if ((mod = cached.find(path)) == null) {
        return next();
      }
      res.writeHead(200);
      return res.end(mod.toString(), 'utf8');
    });
  };
  return function requisite(req, res, next) { return middleware(req, res, next); };;
};

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