authentication_service.rb

class AuthenticationService < ApplicationService
  validates :user_present?,
            I18n.t("devise.failure.invalid"),
            Errors::AuthenticationError

  validates :check_locked,
            I18n.t("devise.failure.locked"),
            Errors::AuthenticationError

  validates :valid_credentials?,
            I18n.t("devise.failure.invalid"),
            Errors::AuthenticationError

  def initialize(user, password)
    @user = user
    @password = password
  end

  def perform
    super do
      JWTWrapper.encode user_id: @user.id
    end
  end

  private

  def user_present?
    @user.present?
  end

  def valid_credentials?
    user_present? && valid_for_authentication?
  end

  def valid_for_authentication?
    @user.valid_for_authentication? {
      @user.valid_password?(@password)
    }
  end

  def check_locked
    !@user.access_locked?
  end
end