halogenandtoast/oath

module Oath
  module Services
    # Authentication service. Checks to see if the credentials provided are valid
    # @since 0.0.15
    class Authentication
      # Initialize service
      #
      # @param user [User] A user object
      # @param undigested_token [String] An undigested password
      def initialize user, undigested_token
        @user = user
        @undigested_token = undigested_token
      end

      # Perform the service
      #
      # @return [User] if authentication succeeds
      # @return [false] if authentication fails
      def perform
        if authenticated?
          user
        else
          false
        end
      end

      private

      attr_reader :user, :undigested_token

      def authenticated?
        user && Oath.compare_token(user.send(token_store_field), undigested_token)
      end

      def token_store_field
        Oath.config.user_token_store_field
      end
    end
  end
end