# File lib/fog/aws/models/storage/directory.rb, line 78
        def public_url
          requires :key
          if service.get_bucket_acl(key).body['AccessControlList'].find {|grant| grant['Grantee']['URI'] == 'http://acs.amazonaws.com/groups/global/AllUsers' && grant['Permission'] == 'READ'}
            service.request_url(
              :bucket_name => key
            )
          else
            nil
          end
        end