Introduction to warden, a Ruby gem which is the base of Devise.

1. Introduce to Warden
@hieuk09

2. about(me)
• @hieuk09
• Ruby Developer at TINYpulse

3. Why warden?

4. A peek at Devise
• 3178 commits
• 8311 LOC
• ~70 dependencies
• Only compatible with Rails

5. Warden
• A devise dependencies
• 287 commits
• 733 LOC
• ~ 20 dependencies
• Compatible with all Rack applications

6. What is warden?
• “Warden provides a mechanism for
authentication in Rack based Ruby
applications"

7. Some concepts
• Strategy
• Failure
• Callback
• User & Scope
• Session

8. Strategy
• How you authenticate
• Password
• OAuth
• Implement 2 methods: valid? & authenticate!

9. Failure
• A rack endpoint
• Handle failure for authentication
• In short: throw(:warden)

10. Callback
• Provide various callbacks to hook into in
authentication cycle (set user, authenticate
success, failure, …)
• Behave similar to Rails callbacks

11. User & Scope
• Set & get user simply by set_user and user
• Scope of user for some scenarios:
• Multiple roles
• Stimulate another user

12. Session
• Store user data in separate scope
• Access through session
• Work like a simple hash

13. Demo & Explain

14. Reference
• https://github.com/hassox/warden/wiki
• https://rossta.net/blog/what-i-learned-about-hanami.html
• http://pothibo.com/2013/07/authentication-with-warden-
devise-less/
• Demo code
• https://github.com/hieuk09/code_commenter
• https://github.com/hieuk09/code-commenter-hanami