public/js/src/session.js

/**
 * Simple cookie based session library that stores
 * values in JSON encoded cookies.
 *
 * @author Nils Diewald
 */
var KorAP = KorAP || {};

(function (KorAP) {
  "use strict";

  
  KorAP.Session = {

    /**
     * Create a new session.
     * Expects a name or defaults to 'korap'
     */
    create : function (name) {
      var obj = Object.create(KorAP.Session);
      if (name === undefined)
	name = 'korap';
      obj._name = name.toLowerCase();
      obj._hash = {};
      obj._parse();
      return obj;
    },

    /**
     * Get a value based on a key.
     * The value can be complex, as the value is stored as JSON.
     */
    get : function (key) {
      return this._hash[key.toLowerCase()];
    },

    /**
     * Set a value based on a key.
     * The value can be complex, as the value is stored as JSON.
     */
    set : function (key, value) {
      this._hash[key] = value;
      this._store();
    },

    /**
     * Clears the session by removing the cookie
     */
    clear : function () {
      document.cookie = this._name + '=; expires=-1';
    },

    /* Store cookie */
    _store : function () {
      /*
	var date = new Date();
	date.setYear(date.getFullYear() + 1);
      */
      document.cookie =
	this._name + '=' + encodeURIComponent(JSON.stringify(this._hash)) + ';';
    },

    /* Parse cookie */
    _parse : function () {
      var c = document.cookie;
      var part = document.cookie.split(';');
      for(var i = 0; i < part.length; i++) {
        var pair = part[i].split('=');
        var name = pair[0].trim().toLowerCase();
	if (name === this._name) {
	  if (pair.length === 1 || pair[1].length === 0)
	    return;
          this._hash = JSON.parse(decodeURIComponent(pair[1]));
	  return;
	};
      };
    }
  }

}(this.KorAP));