permissions to prevent updates we don't want

monkeypath.rb

module Hydra
  module Datastream
    class RightsMetadata < ActiveFedora::NokogiriDatastream
      # Updates permissions for all of the persons and groups in a hash
      # @param params ex. {"group"=>{"group1"=>"discover","group2"=>"edit"}, "person"=>{"person1"=>"read","person2"=>"discover"}}
      # Currently restricts actor type to group or person.  Any others will be ignored
      def update_permissions(params)

        params.fetch("group", {}).each_pair {|group_id, access_level| self.permissions({"group"=>group_id}, access_level)}
        #params.fetch("person", {}).each_pair {|group_id, access_level| self.permissions({"person"=>group_id}, access_level)}

        params.fetch("persion, {}).each_pair do |group_id, access_level|
          unless group_id == 'dmc186' and access_level != "edit"?
            self.permissions({"person"=>group_id}, access_level)}
        end

      end
    end
  end
end

module Hydra
module Datastream
class RightsMetadata < ActiveFedora::NokogiriDatastream
# Validates permissions changes
def validate_permissions(type, actor, access_level)
# do some validations, throw some errors, whatever
end
# Wraps permissions with validation
old_permissions = instance_method(:permissions)
define_method(:permissions) do |selector, new_access_level=nil|
type = selector.keys.first.to_sym
actor = selector.values.first
validate_permissions(type, actor, new_access_level)
old_permissions.bind(self).call
end
end
end
end