feat: cleanup and leverage caching

core/corehttp/gateway_handler.go

@@ -435,10 +435,8 @@ func (i *gatewayHandler) getOrHeadHandler(w http.ResponseWriter, r *http.Request
 		i.serveTAR(r.Context(), w, r, resolvedPath, contentPath, begin, logger)
 		return
 	case "application/vnd.ipfs.ipns-record":
-		// TODO: i.handlePathResolution has been executed here, but we don't really need it. Should we check
-		// this beforehand?
 		logger.Debugw("serving ipns record", "path", contentPath)
-		i.serveIpnsRecord(r.Context(), w, r, contentPath, begin, logger)
+		i.serveIpnsRecord(r.Context(), w, r, resolvedPath, contentPath, begin, logger)
 		return
 	default: // catch-all for unsuported application/vnd.*
 		err := fmt.Errorf("unsupported format %q", responseFormat)

core/corehttp/gateway_handler_ipns_record.go

@@ -13,7 +13,7 @@ import (
 	"go.uber.org/zap"
 )
 
-func (i *gatewayHandler) serveIpnsRecord(ctx context.Context, w http.ResponseWriter, r *http.Request, contentPath ipath.Path, begin time.Time, logger *zap.SugaredLogger) {
+func (i *gatewayHandler) serveIpnsRecord(ctx context.Context, w http.ResponseWriter, r *http.Request, resolvedPath ipath.Resolved, contentPath ipath.Path, begin time.Time, logger *zap.SugaredLogger) {
 	if contentPath.Namespace() != "ipns" {
 		err := fmt.Errorf("%s is not an IPNS link", contentPath.String())
 		webError(w, err.Error(), err, http.StatusBadRequest)
@@ -34,6 +34,11 @@ func (i *gatewayHandler) serveIpnsRecord(ctx context.Context, w http.ResponseWri
 		return
 	}
 
+	// Set cache control headers. See the linked issue for improvements on
+	// IPNS caching based on keys' TTL.
+	// https://github.com/ipfs/kubo/issues/1818#issuecomment-1015849462
+	_ = addCacheControlHeaders(w, r, contentPath, resolvedPath.Cid())
+
 	// Set Content-Disposition
 	var name string
 	if urlFilename := r.URL.Query().Get("filename"); urlFilename != "" {