CookieStorage

Often when you save data into cookies it uses up a small amount of data. Since a cookie can use up to 4096 bytes, the majority of the space is wasted! Also, as a general rule of thumb, a domain can have a maximum of 20 cookies. But what if that isn't enough?

CookieStorage solves these problems by efficiently using the maximum size of a single cookie and packing the data until the full 4096 bytes are consumed. Read on to learn more...

Usage

As you can imagine the API is straightforward.

There is put:

CookieStorage.put('name', 'Chris'); // Save name=Chris to kvstore

..and get:

CookieStorage.get('name'); // Returns 'Chris'

In addition to the main functions, there are more utility methods that assist with managing the cookies. You can check them out by viewing the source.

How it works

CookieStorage maintains a map of keys and values internally and persists them to cookies during every put request. Using the example above, the following statement:

CookieStorage.put('name', 'Chris');

...would generate a cookie similar to this

cskv_0=name=Chris;path=/

A more complicated example:

CookieStorage.put('name', 'Barack Obama');
CookieStorage.put('title', 'President of the United States');
CookieStorage.put('dob', 'August 4, 1961');

// Cookie:
// cskv_0=name=Barack%20Obama|title=President%20of%20the%20United%20States|dob=August%204%2C%201961;path=/

When CookieStorage is initialized, it loads all of the cskv_* cookies into its internal map of key value pairs.

CookieManager

CookieStorage comes with a primitive api to read and write cookies. If it does not meet your needs, feel free to extend or override CookieStorage.CookieManager.

The only safety feature of CookieManager is to ensure that the cskv_* cookies don't exceed the 4096B limit.

When using document.cookie, ,, ;, and space are illegal characters and must be encoded. In addition to this, CookieStorage uses | to separate the key/value pairs in the cookies. Other than that, use CookieStorage.put as you would document.cookie.

TODO

• Add CookieStorage.remove function to erase a k/v pair.
• Make it possible for a k/v pair to span multiple cookies.
• Create libraries for other languages such as PHP, Java, Ruby, etc.