index.js

/**
 * iCards Object
 */

var iCards = exports.iCards = function () {
  var self = this;

  this.version = '1.0';

  // Valid commands
  this._cmds = {
    register_game: {
      type: 'string'    
    },

    register_player: {
      site_id: 'string',
      name: 'string',
    },

    start_game: {},
  };

  // Games Database
  this.games = {};
}

iCards.prototype.parse = function (socket, data) {
  try {
    var cmd = JSON.parse(data);
    this.validate(cmd);

    // execute

    // send back all data
  }
  catch (err) {
    console.log(err);
    socket.write('Unkown command... you suck!\r\n');
  }
}

iCards.prototype.validate = function (command) {
  // validate basic info
  this.validateKey(command, 'c', 'string'); // command
  this.validateKey(command, 'g');           // game key / can be null in some commands.
  this.validateKey(command, 'd', 'object'); // data

  // validate server commands
  if (command['c'] in this._cmds) {
    for (var c in this._cmds[commmand['c']]) {
      this.validateKey(command['d'], c, this._cmds[commmand['c']][c]);
    }
    return true;
  }

  // validate game commands
  this.validateKey(this.games, command['g'], 'object');

  throw "iCards_Ex_Cmd_Unknow";
}

iCards.prototype.validateKey = function (command, key, type) {
  if (! key in command || ( type && !typeof command[key] == type)) {
    throw "iCards_Ex_Cmd_Bad";
  }
}