Lucky,a type-safe web framework written in Crystal by thoughtbot,recently released version 0.12.Along with many other changes,it includes a new cookie system.When starting this work,I knew very little about how HTTP cookies actually worked.We’ll explore what I learned about cookiesand how they are implemented.
Back and Forth
Let’s talk about how cookies are transferred between the browserand the server.Cookies use two headers:Set-Cookieand Cookie.When a server responds to a browser request,it can send down a Set-Cookie header with oneor many cookies:
Set-Cookie: user_id=5; Expires=Fri, 5 Oct 2018 14:28:00 GMT; Secure; HttpOnly, remember_me=trueEach cookie is separated by a comma ,and each cookie attributes are separated by semicolons ;.The two values required are the first name=value pairwhich are always string values.The remaining attributes that set other parameters of a cookieare optionaland set other parameters of a cookie.
To send a cookie back to the server,the browser uses the Cookie header:
Cookie: user_id=5; remember_me=trueEach cookie is separated by a semicolon ;.Don’t confuse this with the Set-Cookie headerwhich confusingly uses a , to separate multiple cookies.Notice that each cookie only contains the name=value pair.The browser cannot send other attributes of a cookie back to the server.
Although many programming languagesand frameworks will abstract the parsingand creation of these cookie headers for you(Crystal,Ruby,PHP,Phoenix,Node.js,Python),it is occasionally good to know how it all works behind the scenes.
Expiration and Removal
Now that we know how cookies are set let’s look at how they are un-set.
Cookies can expire.A cookie with no expiration date specified will expire when the browser is closed.These are often called session cookiesbecause they are removed after the browser session ends(when the browser is closed).Cookies with an expiration date in the past will be removed from the browser.
To remove a cookie,you must set it’s set its expiration date in the past.This will signal to the browser that the cookie should be removed.For cleanliness,it’s also a good idea to set its value to an empty string.
Set-Cookie: user_id=; Expires=Fri, 5 Oct 2018 14:28:00 GMT;Other Goodies
Cookies have a few other interesting attributesthat are used to restrictor permit them from certain locations:
Secure: This will ensure that cookies can only be sent to HTTPS servers.Domain: A list of hosts that a cookie can be sent to.Path: Similar toDomainbut restricts the cookie from being sent to URLsthat do not include thePath.
I won’t cover all these in detail.You can read more about them on theMozilla’s web resource.
Also not covered herewill be the maximum amount of data you can store on a cookie.For the most part,you can assume that you’re fine if you’re under 4k worth of data.In practice,it’s more complicated.
Sessions
Sessions are less straightforward.A session represents the currently logged in user.This might be done by storing something as simple as the user_id,but there is no standard.As far as HTTP is concernedthere is no such thing as a session.We must come up with our own way to store this information.
One common method is to use a cookie’s value to store the session:
Set-Cookie: _myapp_session={"user_id": "5"};An app can now look at the cookie with the name of _myapp_session,readand parse the JSON,and use it for things like setting the current_user on the request.However,the method above as-is is extremely easy to hack.It’s just plain text!
Lock It Down
A good session is encrypted.A more real-world example would be:
Set-Cookie: _myapp_session=zjMvwPnfH7BSRrVIppsUI41eCimOtMOcMwjhAupZntBY1KEML%2FY0i5KYswzB54Mr; Expires=Fri, 1 Jan 2020 00:00:00 GMT; Secure; HttpOnlyThis is a properly encrypted session.The session is first converted to a JSON string.The string of JSON is encrypted using theAES 256 standardwhich turns it into garbled bytes.It is then base64 encoded so it is an ASCII string,since the underlying HTTP protocols expect to work with ASCII.That base64 encoded string becomes the value of the cookie.
When cookies are sent back to the server,they are read,(base64)decoded,decrypted,JSON parsed,and stored in memory as key/value pairs.
This is how sessions work in Lucky.The session will be a cookie with a name like _myapp_session.The value of the cookie is an encrypted JSON stringthat can only be decrypted by a server with the session key.Storing it as JSON allows us to have a key/value like storebut using a single cookie instead of multiple.
There are other ways to store session data,such as a key-value store like Redis.But even this requires a cookie to identify which values to retrieve.
A Side Note About The Flash
The flash is a one-off message displayed to the user after they do something.For example,after you sign in you might see the message:
Welcome back Edward!
If you refresh the pageor navigate elsewhere,this message disappears.
Flash messages are stored as two separates parts:messages for the current requestand messages to be displayed on the next request.These parts are called nowand next.At the start of the request,the existing data is read into an internal now hash which is readand displayed to the user.
When the flash is set during a request/response cycle,it’s stored in an internal next hash.At the response stage,next is converted to JSONand stored in the session.During the following request,next is read into nowand the cycle continues.
Feeling Lucky?
And that’s how cookies,sessions,and the flash works in Lucky!We’ve made a nice,type-safe wrapper around all things cookies can represent.For example,if you wanted to set a cookie with an expiration date that is HTTP Only,you could write it like this:
cookies .set(:current_user_id, 123) .expires(1.year.from_now) .http_only(true)Because Lucky is type safe,you can only pass a Date to the expires methodand only a boolean to the http_only method.The same is true for all the other methods for setting cookie attributes.
This is only the start of what’s new in the latest version of Lucky.Check out theLucky Frameworkif you’d like to play around with any of these conceptsor just try out a new framework!
If you want to read more about HTTP Cookies,I highly recommend theMDN pageon the topic.
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