# Yahoo! UI Library

### cookie 3.0.0b1

Yahoo! UI Library > cookie > Cookie.js (source view)
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    /**
     * Utilities for cookie management
     * @module cookie
     */

        //shortcuts
        var L       = Y.Lang,
            O       = Y.Object,
            NULL    = null,

            //shortcuts to functions
            isString    = L.isString,
            isObject    = L.isObject,
            isUndefined = L.isUndefined,
            isFunction  = L.isFunction,
            encode      = encodeURIComponent,
            decode      = decodeURIComponent,

            //shortcut to document
            doc         = Y.config.doc;

        /*
         * Throws an error message.
         */
        function error(message){
            throw new TypeError(message);
        }

        /*
         * Checks the validity of a cookie name.
         */
        function validateCookieName(name){
            if (!isString(name) || name === ""){
                error("Cookie name must be a non-empty string.");
            }
        }

        /*
         * Checks the validity of a subcookie name.
         */
        function validateSubcookieName(subName){
            if (!isString(subName) || subName === ""){
                error("Subcookie name must be a non-empty string.");
            }
        }

        /**
         * Cookie utility.
         * @class Cookie
         * @static
         */
        Y.Cookie = {

            //-------------------------------------------------------------------------
            // Private Methods
            //-------------------------------------------------------------------------

            /**
             * Creates a cookie string that can be assigned into document.cookie.
             * @param {String} name The name of the cookie.
             * @param {String} value The value of the cookie.
             * @param {Boolean} encodeValue True to encode the value, false to leave as-is.
             * @param {Object} options (Optional) Options for the cookie.
             * @return {String} The formatted cookie string.
             * @method _createCookieString
             * @private
             * @static
             */
            _createCookieString : function (name /*:String*/, value /*:Variant*/, encodeValue /*:Boolean*/, options /*:Object*/) /*:String*/ {

                options = options || {};

                var text /*:String*/ = encode(name) + "=" + (encodeValue ? encode(value) : value),
                    expires = options.expires,
                    path    = options.path,
                    domain  = options.domain;

                if (isObject(options)){
                    //expiration date
                    if (expires instanceof Date){
                        text += "; expires=" + expires.toUTCString();
                    }

                    //path
                    if (isString(path) && path !== ""){
                        text += "; path=" + path;
                    }

                    //domain
                    if (isString(domain) && domain !== ""){
                        text += "; domain=" + domain;
                    }

                    //secure
                    if (options.secure === true){
                        text += "; secure";
                    }
                }

                return text;
            },

            /**
             * Formats a cookie value for an object containing multiple values.
             * @param {Object} hash An object of key-value pairs to create a string for.
             * @return {String} A string suitable for use as a cookie value.
             * @method _createCookieHashString
             * @private
             * @static
             */
            _createCookieHashString : function (hash /*:Object*/) /*:String*/ {
                if (!isObject(hash)){
                    error("Cookie._createCookieHashString(): Argument must be an object.");
                }

                var text /*:Array*/ = [];

                O.each(hash, function(value, key){
                    if (!isFunction(value) && !isUndefined(value)){
                        text.push(encode(key) + "=" + encode(String(value)));
                    }
                });

                return text.join("&");
            },

            /**
             * Parses a cookie hash string into an object.
             * @param {String} text The cookie hash string to parse (format: n1=v1&n2=v2).
             * @return {Object} An object containing entries for each cookie value.
             * @method _parseCookieHash
             * @private
             * @static
             */
            _parseCookieHash : function (text) {

                var hashParts   = text.split("&"),
                    hashPart    = NULL,
                    hash        = {};

                if (text.length){
                    for (var i=0, len=hashParts.length; i < len; i++){
                        hashPart = hashParts[i].split("=");
                        hash[decode(hashPart[0])] = decode(hashPart[1]);
                    }
                }

                return hash;
            },

            /**
             * Parses a cookie string into an object representing all accessible cookies.
             * @param {String} text The cookie string to parse.
             * @param {Boolean} shouldDecode (Optional) Indicates if the cookie values should be decoded or not. Default is true.
             * @return {Object} An object containing entries for each accessible cookie.
             * @method _parseCookieString
             * @private
             * @static
             */
            _parseCookieString : function (text /*:String*/, shouldDecode /*:Boolean*/) /*:Object*/ {

                var cookies /*:Object*/ = {};

                if (isString(text) && text.length > 0) {

                    var decodeValue = (shouldDecode === false ? function(s){return s;} : decode),
                        cookieParts = text.split(/;\s/g),
                        cookieName  = NULL,
                        cookieValue = NULL,
                        cookieNameValue = NULL;

                    for (var i=0, len=cookieParts.length; i < len; i++){

                        //check for normally-formatted cookie (name-value)
                        cookieNameValue = cookieParts[i].match(/([^=]+)=/i);
                        if (cookieNameValue instanceof Array){
                            try {
                                cookieName = decode(cookieNameValue[1]);
                                cookieValue = decodeValue(cookieParts[i].substring(cookieNameValue[1].length+1));
                            } catch (ex){
                                //intentionally ignore the cookie - the encoding is wrong
                            }
                        } else {
                            //means the cookie does not have an "=", so treat it as a boolean flag
                            cookieName = decode(cookieParts[i]);
                            cookieValue = "";
                        }
                        cookies[cookieName] = cookieValue;
                    }

                }

                return cookies;
            },

            //-------------------------------------------------------------------------
            // Public Methods
            //-------------------------------------------------------------------------

            /**
             * Determines if the cookie with the given name exists. This is useful for
             * Boolean cookies (those that do not follow the name=value convention).
             * @param {String} name The name of the cookie to check.
             * @return {Boolean} True if the cookie exists, false if not.
             * @method exists
             * @static
             */
            exists: function(name) {

                validateCookieName(name);   //throws error

                var cookies = this._parseCookieString(doc.cookie, true);

                return cookies.hasOwnProperty(name);
            },

            /**
             * Returns the cookie value for the given name.
             * @param {String} name The name of the cookie to retrieve.
             * @param {Function|Object} options (Optional) An object containing one or more
             *      cookie options: raw (true/false) and converter (a function).
             *      The converter function is run on the value before returning it. The
             *      function is not used if the cookie doesn't exist. The function can be
             *      passed instead of the options object for backwards compatibility. When
             *      raw is set to true, the cookie value is not URI decoded.
             * @return {Variant} If no converter is specified, returns a string or null if
             *      the cookie doesn't exist. If the converter is specified, returns the value
             *      returned from the converter or null if the cookie doesn't exist.
             * @method get
             * @static
             */
            get : function (name, options) {

                validateCookieName(name);   //throws error

                var cookies,
                    cookie,
                    converter;

                //if options is a function, then it's the converter
                if (isFunction(options)) {
                    converter = options;
                    options = {};
                } else if (isObject(options)) {
                    converter = options.converter;
                } else {
                    options = {};
                }

                cookies = this._parseCookieString(doc.cookie, !options.raw);
                cookie = cookies[name];

                //should return null, not undefined if the cookie doesn't exist
                if (isUndefined(cookie)) {
                    return NULL;
                }

                if (!isFunction(converter)){
                    return cookie;
                } else {
                    return converter(cookie);
                }
            },

            /**
             * Returns the value of a subcookie.
             * @param {String} name The name of the cookie to retrieve.
             * @param {String} subName The name of the subcookie to retrieve.
             * @param {Function} converter (Optional) A function to run on the value before returning
             *      it. The function is not used if the cookie doesn't exist.
             * @return {Variant} If the cookie doesn't exist, null is returned. If the subcookie
             *      doesn't exist, null if also returned. If no converter is specified and the
             *      subcookie exists, a string is returned. If a converter is specified and the
             *      subcookie exists, the value returned from the converter is returned.
             * @method getSub
             * @static
             */
            getSub : function (name /*:String*/, subName /*:String*/, converter /*:Function*/) /*:Variant*/ {

                var hash /*:Variant*/ = this.getSubs(name);

                if (hash !== NULL) {

                    validateSubcookieName(subName);   //throws error

                    if (isUndefined(hash[subName])){
                        return NULL;
                    }

                    if (!isFunction(converter)){
                        return hash[subName];
                    } else {
                        return converter(hash[subName]);
                    }
                } else {
                    return NULL;
                }

            },

            /**
             * Returns an object containing name-value pairs stored in the cookie with the given name.
             * @param {String} name The name of the cookie to retrieve.
             * @return {Object} An object of name-value pairs if the cookie with the given name
             *      exists, null if it does not.
             * @method getSubs
             * @static
             */
            getSubs : function (name) {

                validateCookieName(name);   //throws error

                var cookies = this._parseCookieString(doc.cookie, false);
                if (isString(cookies[name])){
                    return this._parseCookieHash(cookies[name]);
                }
                return NULL;
            },

            /**
             * Removes a cookie from the machine by setting its expiration date to
             * sometime in the past.
             * @param {String} name The name of the cookie to remove.
             * @param {Object} options (Optional) An object containing one or more
             *      cookie options: path (a string), domain (a string),
             *      and secure (true/false). The expires option will be overwritten
             *      by the method.
             * @return {String} The created cookie string.
             * @method remove
             * @static
             */
            remove : function (name, options) {

                validateCookieName(name);   //throws error

                //set options
                options = Y.merge(options || {}, {
                    expires: new Date(0)
                });

                //set cookie
                return this.set(name, "", options);
            },

            /**
             * Removes a sub cookie with a given name.
             * @param {String} name The name of the cookie in which the subcookie exists.
             * @param {String} subName The name of the subcookie to remove.
             * @param {Object} options (Optional) An object containing one or more
             *      cookie options: path (a string), domain (a string), expires (a Date object),
             *      removeIfEmpty (true/false), and secure (true/false). This must be the same
             *      settings as the original subcookie.
             * @return {String} The created cookie string.
             * @method removeSub
             * @static
             */
            removeSub : function(name, subName, options) {

                validateCookieName(name);   //throws error

                validateSubcookieName(subName);   //throws error

                options = options || {};

                //get all subcookies for this cookie
                var subs = this.getSubs(name);

                //delete the indicated subcookie
                if (isObject(subs) && subs.hasOwnProperty(subName)){
                    delete subs[subName];

                    if (!options.removeIfEmpty) {
                        //reset the cookie

                        return this.setSubs(name, subs, options);
                    } else {
                        //reset the cookie if there are subcookies left, else remove
                        for (var key in subs){
                            if (subs.hasOwnProperty(key) && !isFunction(subs[key]) && !isUndefined(subs[key])){
                                return this.setSubs(name, subs, options);
                            }
                        }

                        return this.remove(name, options);
                    }
                } else {
                    return "";
                }

            },

            /**
             * Sets a cookie with a given name and value.
             * @param {String} name The name of the cookie to set.
             * @param {Variant} value The value to set for the cookie.
             * @param {Object} options (Optional) An object containing one or more
             *      cookie options: path (a string), domain (a string), expires (a Date object),
             *      secure (true/false), and raw (true/false). Setting raw to true indicates
             *      that the cookie should not be URI encoded before being set.
             * @return {String} The created cookie string.
             * @method set
             * @static
             */
            set : function (name, value, options) {

                validateCookieName(name);   //throws error

                if (isUndefined(value)){
                    error("Cookie.set(): Value cannot be undefined.");
                }

                options = options || {};

                var text = this._createCookieString(name, value, !options.raw, options);
                doc.cookie = text;
                return text;
            },

            /**
             * Sets a sub cookie with a given name to a particular value.
             * @param {String} name The name of the cookie to set.
             * @param {String} subName The name of the subcookie to set.
             * @param {Variant} value The value to set.
             * @param {Object} options (Optional) An object containing one or more
             *      cookie options: path (a string), domain (a string), expires (a Date object),
             *      and secure (true/false).
             * @return {String} The created cookie string.
             * @method setSub
             * @static
             */
            setSub : function (name, subName, value, options) {

                validateCookieName(name);   //throws error

                validateSubcookieName(subName);   //throws error

                if (isUndefined(value)){
                    error("Cookie.setSub(): Subcookie value cannot be undefined.");
                }

                var hash = this.getSubs(name);

                if (!isObject(hash)){
                    hash = {};
                }

                hash[subName] = value;

                return this.setSubs(name, hash, options);

            },

            /**
             * Sets a cookie with a given name to contain a hash of name-value pairs.
             * @param {String} name The name of the cookie to set.
             * @param {Object} value An object containing name-value pairs.
             * @param {Object} options (Optional) An object containing one or more
             *      cookie options: path (a string), domain (a string), expires (a Date object),
             *      and secure (true/false).
             * @return {String} The created cookie string.
             * @method setSubs
             * @static
             */
            setSubs : function (name, value, options) {

                validateCookieName(name);   //throws error

                if (!isObject(value)){
                    error("Cookie.setSubs(): Cookie value must be an object.");
                }

                var text /*:String*/ = this._createCookieString(name, this._createCookieHashString(value), false, options);
                doc.cookie = text;
                return text;
            }

        };

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