Tuesday, May 31, 2011

Encrypted Cookie Store that works with Rails 3.0

If you like the benefits using Rails's CookieStore, but want to store possibly sensitive data in the cookie, then encrypted_cookie_store is for you. It works like CookieStore, but encrypts the cookie payload so that it cannot be read by the client.

If you are using Ruby on Rails 3.0.0 or higher (but not yet Rails 3.1), then you'll need my fork of encrypted_cookie_store that fixes it for Rails 3.

To install it:

gem install scottwb-encrypted_cookie_store

Then add to your bundler Gemfile:

gem 'scottwb-encrypted_cookie_store', :require => 'encrypted_cookie_store'

Then read the rest of the installation/configuration instructions.

Background

For Rails 2.3, the folks at Phusion created encrypted_cookie_store, which you'd install as a plugin, and it worked great. I used it for a long time.

However, they never updated it for Rails 3. That's where Ben Sales came in. He forked this project and made it work for Rails 3...in the pre-release days, that is. Ben did all the work to get it packaged up as a gem and updated it to work with Rails 3 railties and initializers.

Unfortunately, sometime between Rails 3.0.0.beta3 and 3.0.0.beta4, the layout of AbstractStore and CookieStore changed quite a bit, pushing a lot of the functionality out to Rack, and breaking the encrypted_cookie_store gem.

That's where I come in. I basically did the minimal amount of work required to get it to work with Rails 3.0 (tested on 3.0.0, 3.0.7, and 3.0.8.rc4), got all the specs working again, and created a new gem called 'scottwb-encrypted_session_cookie'.

It doesn't work in Rails 3.1, but I'll probably remedy that once Rails 3.1 officially releases. I'm also happy to accept patches if anyone else onces to tackle that.

This is a nice gem. Maybe some day I'll make a push to clean it up and lobby to have it as one of the packaged options that ships with Rails...

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