0

Rails, AuthLogic, CSRF, 422 and session_store.rb

 1 year ago
source link: https://fuzzyblog.io/blog/rails/2017/09/25/rails-authlogic-csrf-422-and-session-store-rb.html
Go to the source link to view the article. You can view the picture content, updated content and better typesetting reading experience. If the link is broken, please click the button below to view the snapshot at that time.

Rails, AuthLogic, CSRF, 422 and session_store.rb

Sep 25, 2017

When you're a professional developer, you come to recognize a category of problems that I refer to as "Pair Programming Required". These are those mysterious failures where you know damn well that something should work but nothing and I repeat nothing works. In this situation, you really want to bring another set of eyes to bear on the problem.

I'm in the process of bringing a new Rails powered application online and I discovered around 3:53 am this morning that login, which works perfectly in development, completely fails in production with the wonderfully helpful error message:

Rails 5 ActionController::InvalidAuthenticityToken error

When I dug into it, I saw that was a CSRF error and, oddly, I was getting a 422 error message returned to me.

The mystery of all this was that this wasn't new login code – it was code that I've been using in another application for months and it has been flawless.

Here are just a few of the things that I tried to address this:

  • Switch from Rails 5.1.x back to 5.0.x
  • Investigate the prepend: true approach to protect_from_forgery (StackOverflow)
  • Rewrite most of application_controller.rb
  • Massively hack around in the guts of AuthLogic
  • Google
  • Stack Overflow
  • Run production locally
  • change, deploy, test, change again, Lather, Rinse Repeat N times where N is > 10 and less than 50

Once I exhausted all these possibilities, I reached out to a friend and he and I paired on it. And that's where the power of pair programming really illustrated itself. We fairly quickly discovered that the issue was that session_store.rb didn't match the production domain. I find it unbelievable that the error message wasn't actually useful but since I've been guilty of that sin more than a few times, well, karma I guess.

Documented here for the next time that I hit this (in the spirit of being a good Internet citizen, I did add it to the Stack Overflow as well).


Posted In: #rails #authlogic #csrf


About Joyk


Aggregate valuable and interesting links.
Joyk means Joy of geeK