module ActiveModel module SecurePassword extend ActiveSupport::Concern class << self attr_accessor :min_cost # :nodoc: end self.min_cost = false module ClassMethods # Adds methods to set and authenticate against a BCrypt password. # This mechanism requires you to have a +password_digest+ attribute. # # Validations for presence of password on create, confirmation of password # (using a +password_confirmation+ attribute) are automatically added. If # you wish to turn off validations, pass validations: false as an # argument. You can add more validations by hand if need be. # # If you don't need the confirmation validation, just don't set any # value to the password_confirmation attribute and the validation # will not be triggered. # # You need to add bcrypt (~> 3.1.7) to Gemfile to use #has_secure_password: # # gem 'bcrypt', '~> 3.1.7' # # Example using Active Record (which automatically includes ActiveModel::SecurePassword): # # # Schema: User(name:string, password_digest:string) # class User < ActiveRecord::Base # has_secure_password # end # # user = User.new(name: 'david', password: '', password_confirmation: 'nomatch') # user.save # => false, password required # user.password = 'mUc3m00RsqyRe' # user.save # => false, confirmation doesn't match # user.password_confirmation = 'mUc3m00RsqyRe' # user.save # => true # user.authenticate('notright') # => false # user.authenticate('mUc3m00RsqyRe') # => user # User.find_by(name: 'david').try(:authenticate, 'notright') # => false # User.find_by(name: 'david').try(:authenticate, 'mUc3m00RsqyRe') # => user def has_secure_password(options = {}) # Load bcrypt gem only when has_secure_password is used. # This is to avoid ActiveModel (and by extension the entire framework) # being dependent on a binary library. begin require 'bcrypt' rescue LoadError $stderr.puts "You don't have bcrypt installed in your application. Please add it to your Gemfile and run bundle install" raise end attr_reader :password include InstanceMethodsOnActivation if options.fetch(:validations, true) # This ensures the model has a password by checking whether the password_digest # is present, so that this works with both new and existing records. However, # when there is an error, the message is added to the password attribute instead # so that the error message will make sense to the end-user. validate do |record| record.errors.add(:password, :blank) unless record.password_digest.present? end validates_confirmation_of :password, if: ->{ password.present? } end # This code is necessary as long as the protected_attributes gem is supported. if respond_to?(:attributes_protected_by_default) def self.attributes_protected_by_default #:nodoc: super + ['password_digest'] end end end end module InstanceMethodsOnActivation # 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('notright') # => false # user.authenticate('mUc3m00RsqyRe') # => user def authenticate(unencrypted_password) BCrypt::Password.new(password_digest) == unencrypted_password && self end # Encrypts the password into the +password_digest+ attribute, only if the # new password is not blank. # # class User < ActiveRecord::Base # has_secure_password validations: false # end # # user = User.new # user.password = nil # user.password_digest # => nil # user.password = 'mUc3m00RsqyRe' # user.password_digest # => "$2a$10$4LEA7r4YmNHtvlAvHhsYAeZmk/xeUVtMTYqwIvYY76EW5GUqDiP4." def password=(unencrypted_password) if unencrypted_password.nil? self.password_digest = nil elsif unencrypted_password.present? @password = unencrypted_password cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST : BCrypt::Engine.cost self.password_digest = BCrypt::Password.create(unencrypted_password, cost: cost) end end def password_confirmation=(unencrypted_password) @password_confirmation = unencrypted_password end end end end