require 'active_support/core_ext/class/attribute.rb'
require 'active_model/mass_assignment_security/permission_set'
module ActiveModel
# = Active Model Mass-Assignment Security
module MassAssignmentSecurity
extend ActiveSupport::Concern
included do
class_attribute :_accessible_attributes
class_attribute :_protected_attributes
class_attribute :_active_authorizer
end
# Mass assignment security provides an interface for protecting attributes
# from end-user assignment. For more complex permissions, mass assignment security
# may be handled outside the model by extending a non-ActiveRecord class,
# such as a controller, with this behavior.
#
# For example, a logged in user may need to assign additional attributes depending
# on their role:
#
# class AccountsController < ApplicationController
# include ActiveModel::MassAssignmentSecurity
#
# attr_accessible :first_name, :last_name
# attr_accessible :first_name, :last_name, :plan_id, :as => :admin
#
# def update
# ...
# @account.update_attributes(account_params)
# ...
# end
#
# protected
#
# def account_params
# role = admin ? :admin : :default
# sanitize_for_mass_assignment(params[:account], role)
# end
#
# end
#
module ClassMethods
# Attributes named in this macro are protected from mass-assignment
# whenever attributes are sanitized before assignment. A role for the
# attributes is optional, if no role is provided then :default is used.
# A role can be defined by using the :as option.
#
# Mass-assignment to these attributes will simply be ignored, to assign
# to them you can use direct writer methods. This is meant to protect
# sensitive attributes from being overwritten by malicious users
# tampering with URLs or forms. Example:
#
# class Customer
# include ActiveModel::MassAssignmentSecurity
#
# attr_accessor :name, :credit_rating
#
# attr_protected :credit_rating, :last_login
# attr_protected :last_login, :as => :admin
#
# def assign_attributes(values, options = {})
# sanitize_for_mass_assignment(values, options[:as]).each do |k, v|
# send("#{k}=", v)
# end
# end
# end
#
# When using the :default role :
#
# customer = Customer.new
# customer.assign_attributes({ "name" => "David", "credit_rating" => "Excellent", :last_login => 1.day.ago }, :as => :default)
# customer.name # => "David"
# customer.credit_rating # => nil
# customer.last_login # => nil
#
# customer.credit_rating = "Average"
# customer.credit_rating # => "Average"
#
# And using the :admin role :
#
# customer = Customer.new
# customer.assign_attributes({ "name" => "David", "credit_rating" => "Excellent", :last_login => 1.day.ago }, :as => :admin)
# customer.name # => "David"
# customer.credit_rating # => "Excellent"
# customer.last_login # => nil
#
# To start from an all-closed default and enable attributes as needed,
# have a look at +attr_accessible+.
#
# Note that using <tt>Hash#except</tt> or <tt>Hash#slice</tt> in place of +attr_protected+
# to sanitize attributes won't provide sufficient protection.
def attr_protected(*args)
options = args.extract_options!
role = options[:as] || :default
self._protected_attributes = protected_attributes_configs.dup
self._protected_attributes[role] = self.protected_attributes(role) + args
self._active_authorizer = self._protected_attributes
end
# Specifies a white list of model attributes that can be set via
# mass-assignment.
#
# Like +attr_protected+, a role for the attributes is optional,
# if no role is provided then :default is used. A role can be defined by
# using the :as option.
#
# This is the opposite of the +attr_protected+ macro: Mass-assignment
# will only set attributes in this list, to assign to the rest of
# attributes you can use direct writer methods. This is meant to protect
# sensitive attributes from being overwritten by malicious users
# tampering with URLs or forms. If you'd rather start from an all-open
# default and restrict attributes as needed, have a look at
# +attr_protected+.
#
# class Customer
# include ActiveModel::MassAssignmentSecurity
#
# attr_accessor :name, :credit_rating
#
# attr_accessible :name
# attr_accessible :name, :credit_rating, :as => :admin
#
# def assign_attributes(values, options = {})
# sanitize_for_mass_assignment(values, options[:as]).each do |k, v|
# send("#{k}=", v)
# end
# end
# end
#
# When using the :default role :
#
# customer = Customer.new
# customer.assign_attributes({ "name" => "David", "credit_rating" => "Excellent", :last_login => 1.day.ago }, :as => :default)
# customer.name # => "David"
# customer.credit_rating # => nil
#
# customer.credit_rating = "Average"
# customer.credit_rating # => "Average"
#
# And using the :admin role :
#
# customer = Customer.new
# customer.assign_attributes({ "name" => "David", "credit_rating" => "Excellent", :last_login => 1.day.ago }, :as => :admin)
# customer.name # => "David"
# customer.credit_rating # => "Excellent"
#
# Note that using <tt>Hash#except</tt> or <tt>Hash#slice</tt> in place of +attr_accessible+
# to sanitize attributes won't provide sufficient protection.
def attr_accessible(*args)
options = args.extract_options!
role = options[:as] || :default
self._accessible_attributes = accessible_attributes_configs.dup
self._accessible_attributes[role] = self.accessible_attributes(role) + args
self._active_authorizer = self._accessible_attributes
end
def protected_attributes(role = :default)
protected_attributes_configs[role]
end
def accessible_attributes(role = :default)
accessible_attributes_configs[role]
end
def active_authorizers
self._active_authorizer ||= protected_attributes_configs
end
alias active_authorizer active_authorizers
def attributes_protected_by_default
[]
end
private
def protected_attributes_configs
self._protected_attributes ||= begin
default_black_list = BlackList.new(attributes_protected_by_default).tap do |w|
w.logger = self.logger if self.respond_to?(:logger)
end
Hash.new(default_black_list)
end
end
def accessible_attributes_configs
self._accessible_attributes ||= begin
default_white_list = WhiteList.new.tap { |w| w.logger = self.logger if self.respond_to?(:logger) }
Hash.new(default_white_list)
end
end
end
protected
def sanitize_for_mass_assignment(attributes, role = :default)
mass_assignment_authorizer(role).sanitize(attributes)
end
def mass_assignment_authorizer(role = :default)
self.class.active_authorizer[role]
end
end
end
