photomix/lib/acts_as_permissible.rb

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2009-06-05 14:18:03 +02:00
# ActsAsPermissible
module NoamBenAri
module Acts #:nodoc:
module Permissible #:nodoc:
def self.included(base)
base.extend ClassMethods
end
module ClassMethods
def acts_as_permissible
has_many :permissions, :as => :permissible, :dependent => :destroy
has_many :role_memberships, :as => :roleable, :dependent => :destroy
has_many :roles, :through => :role_memberships, :source => :role
include NoamBenAri::Acts::Permissible::InstanceMethods
extend NoamBenAri::Acts::Permissible::SingletonMethods
alias_method :full_permissions_hash, :permissions_hash
end
end
# This module contains class methods
module SingletonMethods
# Helper method to lookup for permissions for a given object.
# This method is equivalent to obj.permissions.
def find_permissions_for(obj)
permissible = ActiveRecord::Base.send(:class_name_of_active_record_descendant, self).to_s
Permission.find(:all,
:conditions => ["permissible_id = ? and permissible_type = ?", obj.id, permissible]
)
end
end
# This module contains instance methods
module InstanceMethods
# returns permissions in hash form
# from all levels recursively
def permissions_hash
@permissions_hash ||= lambda do
@permissions_hash = permissions.inject({}) { |hsh,perm| hsh.merge(perm.to_hash) }.symbolize_keys!
roles.each do |role|
merge_permissions!(role.permissions_hash)
end
@permissions_hash
end.call()
end
# accepts a permission identifier string or an array of permission identifier strings
# and return true if the user has all of the permissions given by the parameters
# false if not.
def has_permission?(*perms)
perms.all? {|perm| permissions_hash.include?(perm.to_sym) && (permissions_hash[perm.to_sym] == true) }
end
# accepts a permission identifier string or an array of permission identifier strings
# and return true if the user has any of the permissions given by the parameters
# false if none.
def has_any_permission?(*perms)
perms.any? {|perm| permissions_hash.include?(perm.to_sym) && (permissions_hash[perm.to_sym] == true) }
end
# Merges another permissible object's permissions into this permissible's permissions hash
# In the case of identical keys, a false value wins over a true value.
def merge_permissions!(other_permissions_hash)
permissions_hash.merge!(other_permissions_hash) {|key,oldval,newval| oldval.nil? ? newval : oldval && newval}
end
# Resets permissions and then loads them.
def reload_permissions!
reset_permissions!
permissions_hash
end
def roles_list
list = []
roles.inject(list) do |list,role|
list << role.name
role.roles_list.inject(list) {|list,role| list << role}
end
list.uniq
end
def in_role?(*role_names)
role_names.all? {|role| roles_list.include?(role) }
end
def in_any_role?(*role_names)
role_names.any? {|role| roles_list.include?(role) }
end
private
# Nilifies permissions_hash instance variable.
def reset_permissions!
@permissions_hash = nil
end
end
end
end
end