Cookie based authentication strategy in Devise

application.rb

# config/application.rb

module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(#{config.root}/lib/devise)
    # rest of the file
  end
end

cookie_token_auth_strategy.rb

# lib/devise/cookie_token_auth_strategy.rb

Warden::Strategies.add(:token_cookie_strategy) do
  def valid?
    token_from_cookie
  end

  def authenticate!
    if token_from_cookie.present? && (user = User.find_for_token_authentication(:auth_token => token_from_cookie)).present?
      delete_token_from_cookie
      success!(user)
    else
      fail!("Could not log in")
    end
  end

  def token_from_cookie
    cookies[:authentication_token]
  end

  def delete_token_from_cookie
    cookies.delete(:authentication_token)
  end
  
end

devise.rb

# config/initializers/devise.rb

Devise.setup do |config|
  config.warden do |manager|
    manager.default_strategies(:scope => :user).unshift :token_cookie_strategy
  end

# rest fo the file
end