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Node.Js And Stuff

, 11 Feb 2013
Small demo app using Node.Js/Socket.IO/MongoDB/D3.Js and jQuery.
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/**
 * Module dependencies and cached references.
 */

var slice = Array.prototype.slice
  , net = require('net');

/**
 * The server that does the Policy File severing
 *
 * Options:
 *   - `log`  false or a function that can output log information, defaults to console.log?
 *
 * @param {Object} options Options to customize the servers functionality.
 * @param {Array} origins The origins that are allowed on this server, defaults to `*:*`.
 * @api public
 */

function Server (options, origins) {
  var me = this;

  this.origins = origins || ['*:*'];
  this.port = 843;
  this.log = console.log;

  // merge `this` with the options
  Object.keys(options).forEach(function (key) {
    me[key] && (me[key] = options[key])
  });

  // create the net server
  this.socket = net.createServer(function createServer (socket) {
    socket.on('error', function socketError () { 
      me.responder.call(me, socket);
    });

    me.responder.call(me, socket);
  });

  // Listen for errors as the port might be blocked because we do not have root priv.
  this.socket.on('error', function serverError (err) {
    // Special and common case error handling
    if (err.errno == 13) {
      me.log && me.log(
        'Unable to listen to port `' + me.port + '` as your Node.js instance does not have root privileges. ' +
        (
          me.server
          ? 'The Flash Policy File requests will only be served inline over the supplied HTTP server. Inline serving is slower than a dedicated server instance.'
          : 'No fallback server supplied, we will be unable to answer Flash Policy File requests.'
        )
      );

      me.emit('connect_failed', err);
      me.socket.removeAllListeners();
      delete me.socket;
    } else {
      me.log && me.log('FlashPolicyFileServer received an error event:\n' + (err.message ? err.message : err));
    }
  });

  this.socket.on('timeout', function serverTimeout () {});
  this.socket.on('close', function serverClosed (err) {
    err && me.log && me.log('Server closing due to an error: \n' + (err.message ? err.message : err));

    if (me.server) {
      // Remove the inline policy listener if we close down
      // but only when the server was `online` (see listen prototype)
      if (me.server['@'] && me.server.online) {
        me.server.removeListener('connection', me.server['@']);
      }

      // not online anymore
      delete me.server.online;
    }
  });

  // Compile the initial `buffer`
  this.compile();
}

/**
 * Start listening for requests
 *
 * @param {Number} port The port number it should be listening to.
 * @param {Server} server A HTTP server instance, this will be used to listen for inline requests
 * @param {Function} cb The callback needs to be called once server is ready
 * @api public
 */

Server.prototype.listen = function listen (port, server, cb){
  var me = this
    , args = slice.call(arguments, 0)
    , callback;
 
  // assign the correct vars, for flexible arguments
  args.forEach(function args (arg){
    var type = typeof arg;

    if (type === 'number') me.port = arg;
    if (type === 'function') callback = arg;
    if (type === 'object') me.server = arg;
  });

  if (this.server) {

    // no one in their right mind would ever create a `@` prototype, so Im just gonna store
    // my function on the server, so I can remove it later again once the server(s) closes
    this.server['@'] = function connection (socket) {
      socket.once('data', function requestData (data) {
        // if it's a Flash policy request, and we can write to the 
        if (
             data
          && data[0] === 60
          && data.toString() === '<policy-file-request/>\0'
          && socket
          && (socket.readyState === 'open' || socket.readyState === 'writeOnly')
        ){
          // send the buffer
          try {
            socket.end(me.buffer);
          } catch (e) {}
        }
      });
    };

    // attach it
    this.server.on('connection', this.server['@']);
  }

  // We add a callback method, so we can set a flag for when the server is `enabled` or `online`.
  // this flag is needed because if a error occurs and the we cannot boot up the server the
  // fallback functionality should not be removed during the `close` event
  this.port >= 0 && this.socket.listen(this.port, function serverListening () {
    me.socket.online = true;
    if (callback) {
      callback.call(me);
      callback = undefined;
    }
  });

  return this;
};

/**
 * Responds to socket connects and writes the compile policy file.
 *
 * @param {net.Socket} socket The socket that needs to receive the message
 * @api private
 */

Server.prototype.responder = function responder (socket){
  if (socket && socket.readyState == 'open' && socket.end) {
    try {
      socket.end(this.buffer);
    } catch (e) {}
  }
};

/**
 * Compiles the supplied origins to a Flash Policy File format and stores it in a Node.js Buffer
 * this way it can be send over the wire without any performance loss.
 *
 * @api private
 */

Server.prototype.compile = function compile (){
  var xml = [
        '<?xml version="1.0"?>'
      , '<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">'
      , '<cross-domain-policy>'
    ];

  // add the allow access element
  this.origins.forEach(function origin (origin){
    var parts = origin.split(':');
    xml.push('<allow-access-from domain="' + parts[0] + '" to-ports="'+ parts[1] +'"/>');
  });

  xml.push('</cross-domain-policy>');

  // store the result in a buffer so we don't have to re-generate it all the time
  this.buffer = new Buffer(xml.join(''), 'utf8');

  return this;
};

/**
 * Adds a new origin to the Flash Policy File.
 *
 * @param {Arguments} The origins that need to be added.
 * @api public
 */

Server.prototype.add = function add(){
  var args = slice.call(arguments, 0)
    , i = args.length;

  // flag duplicates
  while (i--) {
    if (this.origins.indexOf(args[i]) >= 0){
      args[i] = null;
    }
  }

  // Add all the arguments to the array
  // but first we want to remove all `falsy` values from the args
  Array.prototype.push.apply(
    this.origins
  , args.filter(function filter (value) {
      return !!value;
    })
  );

  this.compile();
  return this;
};

/**
 * Removes a origin from the Flash Policy File.
 *
 * @param {String} origin The origin that needs to be removed from the server
 * @api public
 */

Server.prototype.remove = function remove (origin){
  var position = this.origins.indexOf(origin);

  // only remove and recompile if we have a match
  if (position > 0) {
    this.origins.splice(position,1);
    this.compile();
  }

  return this;
};

/**
 * Closes and cleans up the server
 *
 * @api public
 */

Server.prototype.close = function close () {
  this.socket.removeAllListeners();
  this.socket.close();

  return this;
};

/**
 * Proxy the event listener requests to the created Net server
 */

Object.keys(process.EventEmitter.prototype).forEach(function proxy (key){
  Server.prototype[key] = Server.prototype[key] || function () {
    if (this.socket) {
      this.socket[key].apply(this.socket, arguments);
    }

    return this;
  };
});

/**
 * Creates a new server instance.
 *
 * @param {Object} options A options object to override the default config
 * @param {Array} origins The origins that should be allowed by the server
 * @api public
 */

exports.createServer = function createServer(options, origins){
  origins = Array.isArray(origins) ? origins : (Array.isArray(options) ? options : false);
  options = !Array.isArray(options) && options ? options : {};

  return new Server(options, origins);
};

/**
 * Provide a hook to the original server, so it can be extended if needed.
 */

exports.Server = Server;

/**
 * Module version
 */

exports.version = '0.0.4';

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About the Author

Sacha Barber
Software Developer (Senior)
United Kingdom United Kingdom
I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)
 
- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence
 
Both of these at Sussex University UK.
 
Award(s)

I am lucky enough to have won a few awards for Zany Crazy code articles over the years

  • Microsoft C# MVP 2014
  • Codeproject MVP 2014
  • Microsoft C# MVP 2013
  • Codeproject MVP 2013
  • Microsoft C# MVP 2012
  • Codeproject MVP 2012
  • Microsoft C# MVP 2011
  • Codeproject MVP 2011
  • Microsoft C# MVP 2010
  • Codeproject MVP 2010
  • Microsoft C# MVP 2009
  • Codeproject MVP 2009
  • Microsoft C# MVP 2008
  • Codeproject MVP 2008
  • And numerous codeproject awards which you can see over at my blog

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