A small library for adding permissions to an application for authorization.
gem install permissions
for(*keys, &block): Creates a permission with the given block for each key.
authorize?(key, *args): Runs permission block for key with args.
deep_dup: Copies permissions to a new object.
permissions: Must be implemented by your application.
authorize_for?(key, *args) Based off the implemented permissions, calls block with self and args for the given key.
require 'permissions'
class User
include Permissions::Authorizable
def initialize(permissions)
@permissions = permissions
end
end
class Command
attr_reader :user
def initialize(user)
@user = user
end
end
permissions = Permissions.new
permissions.for(Command) { |user, command| user == command.user }
user = User.new(permissions)
foo = Command.new(user)
bar = Command.new(nil)
user.authorize_for?(Command, foo) # true
user.authorize_for?(Command, bar) # false
permissions.authorize?(Command, user, foo) # true
permissions.authorize?(Command, user, bar) # false