Andrew's git - gitweb.git/blob - gitweb/static/js/lib/cookies.js

   1/**
   2 * @fileOverview Accessing cookies from JavaScript
   3 * @license GPLv2 or later
   4 */
   5
   6/*
   7 * Based on subsection "Cookies in JavaScript" of "Professional
   8 * JavaScript for Web Developers" by Nicholas C. Zakas and cookie
   9 * plugin from jQuery (dual licensed under the MIT and GPL licenses)
  10 */
  11
  12
  13/**
  14 * Create a cookie with the given name and value,
  15 * and other optional parameters.
  16 *
  17 * @example
  18 *   setCookie('foo', 'bar'); // will be deleted when browser exits
  19 *   setCookie('foo', 'bar', { expires: new Date(Date.parse('Jan 1, 2012')) });
  20 *   setCookie('foo', 'bar', { expires: 7 }); // 7 days = 1 week
  21 *   setCookie('foo', 'bar', { expires: 14, path: '/' });
  22 *
  23 * @param {String} sName:    Unique name of a cookie (letters, numbers, underscores).
  24 * @param {String} sValue:   The string value stored in a cookie.
  25 * @param {Object} [options] An object literal containing key/value pairs
  26 *                           to provide optional cookie attributes.
  27 * @param {String|Number|Date} [options.expires] Either literal string to be used as cookie expires,
  28 *                            or an integer specifying the expiration date from now on in days,
  29 *                            or a Date object to be used as cookie expiration date.
  30 *                            If a negative value is specified or a date in the past),
  31 *                            the cookie will be deleted.
  32 *                            If set to null or omitted, the cookie will be a session cookie
  33 *                            and will not be retained when the the browser exits.
  34 * @param {String} [options.path] Restrict access of a cookie to particular directory
  35 *                               (default: path of page that created the cookie).
  36 * @param {String} [options.domain] Override what web sites are allowed to access cookie
  37 *                                  (default: domain of page that created the cookie).
  38 * @param {Boolean} [options.secure] If true, the secure attribute of the cookie will be set
  39 *                                   and the cookie would be accessible only from secure sites
  40 *                                   (cookie transmission will require secure protocol like HTTPS).
  41 */
  42function setCookie(sName, sValue, options) {
  43        options = options || {};
  44        if (sValue === null) {
  45                sValue = '';
  46                option.expires = 'delete';
  47        }
  48
  49        var sCookie = sName + '=' + encodeURIComponent(sValue);
  50
  51        if (options.expires) {
  52                var oExpires = options.expires, sDate;
  53                if (oExpires === 'delete') {
  54                        sDate = 'Thu, 01 Jan 1970 00:00:00 GMT';
  55                } else if (typeof oExpires === 'string') {
  56                        sDate = oExpires;
  57                } else {
  58                        var oDate;
  59                        if (typeof oExpires === 'number') {
  60                                oDate = new Date();
  61                                oDate.setTime(oDate.getTime() + (oExpires * 24 * 60 * 60 * 1000)); // days to ms
  62                        } else {
  63                                oDate = oExpires;
  64                        }
  65                        sDate = oDate.toGMTString();
  66                }
  67                sCookie += '; expires=' + sDate;
  68        }
  69
  70        if (options.path) {
  71                sCookie += '; path=' + (options.path);
  72        }
  73        if (options.domain) {
  74                sCookie += '; domain=' + (options.domain);
  75        }
  76        if (options.secure) {
  77                sCookie += '; secure';
  78        }
  79        document.cookie = sCookie;
  80}
  81
  82/**
  83 * Get the value of a cookie with the given name.
  84 *
  85 * @param {String} sName: Unique name of a cookie (letters, numbers, underscores)
  86 * @returns {String|null} The string value stored in a cookie
  87 */
  88function getCookie(sName) {
  89        var sRE = '(?:; )?' + sName + '=([^;]*);?';
  90        var oRE = new RegExp(sRE);
  91        if (oRE.test(document.cookie)) {
  92                return decodeURIComponent(RegExp['$1']);
  93        } else {
  94                return null;
  95        }
  96}
  97
  98/**
  99 * Delete cookie with given name
 100 *
 101 * @param {String} sName:    Unique name of a cookie (letters, numbers, underscores)
 102 * @param {Object} [options] An object literal containing key/value pairs
 103 *                           to provide optional cookie attributes.
 104 * @param {String} [options.path]   Must be the same as when setting a cookie
 105 * @param {String} [options.domain] Must be the same as when setting a cookie
 106 */
 107function deleteCookie(sName, options) {
 108        options = options || {};
 109        options.expires = 'delete';
 110
 111        setCookie(sName, '', options);
 112}
 113
 114/* end of cookies.js */