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require 'active_support/core_ext/object/blank'
require 'bcrypt'
module ActiveModel
module SecurePassword
extend ActiveSupport::Concern
WEAK_PASSWORDS = %w( password qwerty 123456 )
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, confirmation of password (using a "password_confirmation" attribute),
# and strength of password (at least 6 chars, not "password", etc) are automatically added.
# You can add more validations by hand if need be.
#
# 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 => "secret", :password_confirmation => "nomatch")
# user.save # => false, password not long enough
# 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") # => nil
# User.find_by_name("david").try(:authenticate, "mUc3m00RsqyRe") # => user
def has_secure_password
attr_reader :password
attr_accessor :password_confirmation
attr_protected(:password_digest) if respond_to?(:attr_protected)
validates_confirmation_of :password
validates_presence_of :password_digest
validate :password_must_be_strong
end
end
# Returns self if the password is correct, otherwise false.
def authenticate(unencrypted_password)
if BCrypt::Password.new(password_digest) == unencrypted_password
self
else
false
end
end
# Encrypts the password into the password_digest attribute.
def password=(unencrypted_password)
@password = unencrypted_password
self.password_digest = BCrypt::Password.create(unencrypted_password)
end
private
def password_must_be_strong
if password.present?
errors.add(:password, "must be longer than 6 characters") unless password.size > 6
errors.add(:password, "is too weak and common") if WEAK_PASSWORDS.include?(password)
end
end
end
end
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