module WCC
  module Media
    module Cacheable
      def cache_key
        return @cache_key if @cache_key

        key =
          (headers&.fetch('Etag', nil) if respond_to?(:headers))
        key ||= WCC::Media::Cacheable.hash_cache_key(raw)
        @cache_key = "#{self.class.name}/#{key}"
      end

      def self.hash_cache_key(hash)
        Digest::SHA1.hexdigest(Marshal.dump(hash))
      end
    end
  end
end