Tiddle

Tiddle provides Devise strategy for token authentication in API-only Ruby on Rails applications. Its main feature is support for multiple tokens per user.

Tiddle is lightweight and non-configurable. It does what it has to do and leaves some manual implementation to you.

Installation

Add this line to your application's Gemfile:

gem 'tiddle'

And then execute:

$ bundle

Usage

1) Add :token_authenticatable inside your Devise-enabled model:

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable,
         :recoverable, :trackable, :validatable,
         :token_authenticatable
end

2) Generate the model which stores authentication tokens. The model name is not important, but the Devise-enabled model should have association called authentication_tokens.

rails g model AuthenticationToken body:string user:references last_used_at:datetime ip_address:string user_agent:string

class User < ActiveRecord::Base
  has_many :authentication_tokens
end

body, last_used_at, ip_address and user_agent fields are required.

3) Customize Devise::SessionsController. You need to create and return token in #create and expire the token in #destroy.

class Users::SessionsController < Devise::SessionsController

  def create
    user = warden.authenticate!(auth_options)
    token = Tiddle.create_and_return_token(user, request)
    render json: { authentication_token: token }
  end

  def destroy
    Tiddle.expire_token(current_user, request) if current_user
    render json: {}
  end

  private

    # this is invoked before destroy and we have to override it
    def verify_signed_out_user
    end
end

4) Require authentication for some controller:

class PostsController < ApplicationController
  before_action :authenticate_user!

  def index
    render json: Post.all
  end
end

5) Send X-USER-EMAIL and X-USER-TOKEN as headers of every request which requires authentication.

You can read more in a blog post dedicated to Tiddle - http://adamniedzielski.github.io/blog/2015/04/04/token-authentication-with-tiddle/