Yet Another Authentication Gem (YAAG) provides passwordless authentication for your rails app, all it takes is the user's e-mail address.

No password. No e-mail confirmation. No registration.

bundle add yaag
bundle install

rails g authentication:install
rails db:migrate

It's the same mechanics of password reset in traditional authentication: the user provides an e-amil address and receives a link with a token to sign in. At its core, it implements the same logic of the built-in rails authentication (in fact most of the gem's code came from the rails library).

Add this line to your application's Gemfile:

bundle add yaag

And then execute:

bundle

Generate the authentication components (migrations, etc):

rails g authentication:install

Follow the on-screen post-installation instructions.

By default, all controllers require signing in via the inclusion of include Authentication in the ApplicationController. If you have a route that doesn't require signing in, add allow_unauthenticated_access to it:

class GuestController < ApplicationController
  allow_unauthenticated_access only: %i[ index ]
  ...
end

Get the current user with Current.user and the current session with Current.session

class MyController < ApplicationController
  def something
    user = Current.user
    session = Current.session
    ...
  end 
end

Here is a list of generator available in case any of the components of the gem need to be customized to specific application needs.

For views:

rails g authentication:copy:views

For controllers (including concerns):

rails g authentication:copy:controllers

For channels (application_cable/connection.rb):

rails g authentication:copy:channels

For mailers:

rails g authentication:copy:mailers

For models:

rails g authentication:copy:models

Note: some generators may copy several files into the application folder, it's safe to delete the ones that don't require modification.

To be able to perform tasks as an authenticated user, a helper is available to be used in tests. Add include Yaag::Test::SessionsHelper to your test class to access the methods sign_in_as and sign_out:

class MyControllerTest < ActionDispatch::IntegrationTest
  include Yaag::Test::SessionsHelper
  setup { sign_in_as(User.take) }
  ...
end

Note: the example above requires users fixtures to exist, which are not provided by this gem.

git tag $(bundle exec rake version | tr -d '"') && git push --tags

The gem is available as open source under the terms of the MIT License.