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author | Gonçalo Silva <goncalossilva@gmail.com> | 2010-07-10 17:36:10 +0100 |
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committer | Gonçalo Silva <goncalossilva@gmail.com> | 2010-07-10 17:36:10 +0100 |
commit | cd2bbed9846d84a1230a1b9e52843eedca17b28d (patch) | |
tree | 5214b7855f3d102e4c22239b9d62bc5717cb3547 /activemodel/lib/active_model/mass_assignment_security.rb | |
parent | d2c633ba0bfb7baacdee89a46d7d036d24c68817 (diff) | |
parent | 80e47d7b88dcc732ebeb5290faab6e529829dac6 (diff) | |
download | rails-cd2bbed9846d84a1230a1b9e52843eedca17b28d.tar.gz rails-cd2bbed9846d84a1230a1b9e52843eedca17b28d.tar.bz2 rails-cd2bbed9846d84a1230a1b9e52843eedca17b28d.zip |
Merge branch 'master' of http://github.com/rails/rails
Diffstat (limited to 'activemodel/lib/active_model/mass_assignment_security.rb')
-rw-r--r-- | activemodel/lib/active_model/mass_assignment_security.rb | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/mass_assignment_security.rb b/activemodel/lib/active_model/mass_assignment_security.rb new file mode 100644 index 0000000000..66cd9fdde6 --- /dev/null +++ b/activemodel/lib/active_model/mass_assignment_security.rb @@ -0,0 +1,160 @@ +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 + # + # def self.admin_accessible_attributes + # accessible_attributes + [ :plan_id ] + # end + # + # def update + # ... + # @account.update_attributes(account_params) + # ... + # end + # + # protected + # + # def account_params + # sanitize_for_mass_assignment(params[:account]) + # end + # + # def mass_assignment_authorizer + # admin ? admin_accessible_attributes : super + # end + # + # end + # + module ClassMethods + # Attributes named in this macro are protected from mass-assignment + # whenever attributes are sanitized before assignment. + # + # 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 + # + # def attributes=(values) + # sanitize_for_mass_assignment(values).each do |k, v| + # send("#{k}=", v) + # end + # end + # end + # + # customer = Customer.new + # customer.attributes = { "name" => "David", "credit_rating" => "Excellent" } + # customer.name # => "David" + # customer.credit_rating # => nil + # + # customer.credit_rating = "Average" + # customer.credit_rating # => "Average" + # + # 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(*names) + self._protected_attributes = self.protected_attributes + names + self._active_authorizer = self._protected_attributes + end + + # Specifies a white list of model attributes that can be set via + # mass-assignment. + # + # 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 + # + # def attributes=(values) + # sanitize_for_mass_assignment(values).each do |k, v| + # send("#{k}=", v) + # end + # end + # end + # + # customer = Customer.new + # customer.attributes = { :name => "David", :credit_rating => "Excellent" } + # customer.name # => "David" + # customer.credit_rating # => nil + # + # customer.credit_rating = "Average" + # customer.credit_rating # => "Average" + # + # 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(*names) + self._accessible_attributes = self.accessible_attributes + names + self._active_authorizer = self._accessible_attributes + end + + def protected_attributes + self._protected_attributes ||= BlackList.new(attributes_protected_by_default).tap do |w| + w.logger = self.logger if self.respond_to?(:logger) + end + end + + def accessible_attributes + self._accessible_attributes ||= WhiteList.new.tap { |w| w.logger = self.logger if self.respond_to?(:logger) } + end + + def active_authorizer + self._active_authorizer ||= protected_attributes + end + + def attributes_protected_by_default + [] + end + end + + protected + + def sanitize_for_mass_assignment(attributes) + mass_assignment_authorizer.sanitize(attributes) + end + + def mass_assignment_authorizer + self.class.active_authorizer + end + end +end |