has_secure_password.rb

has_secure_password.rb

require 'digest/md5'

module SecurablePassword
  def self.included(base)
    base.extend(ClassMethods)
  end
  module ClassMethods
    def has_secure_password(name = :password)
      include HasSecurePassword.new(name)
    end
    class HasSecurePassword < Module
      def initialize(name)
        attr_reader name
        attr_accessor :"#{name}_digest"
        define_method("#{name}=") do |value|
          self.send("#{name}_digest=", Digest::MD5.hexdigest(value))
        end
        define_method("authenticate?") do |value|
          self.send("#{name}_digest") === Digest::MD5.hexdigest(value)
        end
      end
    end
  end
end
class Model
  include SecurablePassword
  has_secure_password(:password)
end
model = Model.new
model.password = "1234"
p model.authenticate?("abc")
p model.authenticate?("1234")
p model.password_digest