class ActiveModel::SecurePassword::InstanceMethodsOnActivation

def initialize(attribute, reset_token:)
  attr_reader attribute
  define_method("#{attribute}=") do |unencrypted_password|
    if unencrypted_password.nil?
      instance_variable_set("@#{attribute}", nil)
      self.public_send("#{attribute}_digest=", nil)
    elsif !unencrypted_password.empty?
      instance_variable_set("@#{attribute}", unencrypted_password)
      cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST : BCrypt::Engine.cost
      self.public_send("#{attribute}_digest=", BCrypt::Password.create(unencrypted_password, cost: cost))
    end
  end
  attr_accessor :"#{attribute}_confirmation", :"#{attribute}_challenge"
  # Returns +self+ if the password is correct, otherwise +false+.
  #
  #   class User < ActiveRecord::Base
  #     has_secure_password validations: false
  #   end
  #
  #   user = User.new(name: 'david', password: 'mUc3m00RsqyRe')
  #   user.save
  #   user.authenticate_password('notright')      # => false
  #   user.authenticate_password('mUc3m00RsqyRe') # => user
  define_method("authenticate_#{attribute}") do |unencrypted_password|
    attribute_digest = public_send("#{attribute}_digest")
    attribute_digest.present? && BCrypt::Password.new(attribute_digest).is_password?(unencrypted_password) && self
  end
  # Returns the salt, a small chunk of random data added to the password before it's hashed.
  define_method("#{attribute}_salt") do
    attribute_digest = public_send("#{attribute}_digest")
    attribute_digest.present? ? BCrypt::Password.new(attribute_digest).salt : nil
  end
  alias_method :authenticate, :authenticate_password if attribute == :password
  if reset_token
    # Returns the class-level configured reset token for the password.
    define_method("#{attribute}_reset_token") do
      generate_token_for(:"#{attribute}_reset")
    end
  end
end