heartcombo/devise

Devise is a complete user authentication library for Ruby on Rails web applications. Authentication means handling everything related to user accounts, signing up, logging in, resetting forgotten passwords, and logging out. Without a library like this, developers would need to write all that security-sensitive code from scratch. It works through a modular system of ten independent features called modules. You only include the ones you need. For example, the Confirmable module sends a confirmation email when someone registers. Recoverable handles password resets. Trackable records how often and from where users log in. Lockable blocks accounts after too many failed login attempts. Rememberable keeps users logged in across browser sessions via a cookie. You can mix and match these features based on what your application actually needs. Devise is built on top of Warden, a lower-level authentication framework for Rack (the interface that Ruby web servers use). This means it integrates cleanly into Rails without fighting the framework. A Rails developer would reach for Devise any time they need to add user accounts to a web application, whether that's a simple blog, a SaaS product, or an internal company tool. It supports multiple types of users simultaneously (say, a separate Admin model and a Customer model), and it works with both traditional SQL databases via ActiveRecord and document databases via Mongoid. It also supports third-party login via OmniAuth, enabling "Sign in with Google" style flows. The language is Ruby and the framework is Rails.