# File lib/fog/google/models/storage/file.rb, line 93
        def public_url
          requires :directory, :key
          if service.get_object_acl(directory.key, key).body['AccessControlList'].detect {|entry| entry['Scope']['type'] == 'AllUsers' && entry['Permission'] == 'READ'}
            if directory.key.to_s =~ /^(?:[a-z]|\d(?!\d{0,2}(?:\.\d{1,3}){3}$))(?:[a-z0-9]|\.(?![\.\-])|\-(?![\.])){1,61}[a-z0-9]$/
              "https://#{directory.key}.storage.googleapis.com/#{key}"
            else
              "https://storage.googleapis.com/#{directory.key}/#{key}"
            end
          else
            nil
          end
        end