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require 'active_support/core_ext/object/blank'
require 'bcrypt'
module ActiveModel
module SecurePassword
extend ActiveSupport::Concern
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
# Allows you to specify the set of weak passwords that will be validated against
# if you specify has_secure_password in your model.
#
# The default set of weak passwords are:
#
# class User < ActiveRecord::Base
# weak_passwords = %w( password qwerty 123456 mypass )
# end
def weak_passwords=(*values)
@weak_passwords = values.flatten
end
# Returns the list of current weak passwords defined. Defaults to the standard
# list of 'password', 'qwerty' and '123456'
#
# User.weak_passwords #=> ['password', 'qwerty', '123456']
def weak_passwords
@weak_passwords ||= %w( password qwerty 123456 )
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, :too_short, :count => 7) unless password.size > 6
errors.add(:password, :insecure) if self.class.weak_passwords.include?(password)
end
end
end
end
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