Add caching to static files based on etag

cmd/server/main.go

@@ -6,8 +6,10 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"time"
 
 	"forgejo.gwairfelin.com/max/gonotes/internal/conf"
+	"forgejo.gwairfelin.com/max/gonotes/internal/middleware"
 	"forgejo.gwairfelin.com/max/gonotes/internal/notes/views"
 )
 
@@ -24,12 +26,22 @@ func main() {
 	router := http.NewServeMux()
 	notesRouter := views.GetRoutes("/notes")
 
+	cacheExpiration, err := time.ParseDuration("24h")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	etag := middleware.NewETag("static", cacheExpiration)
+
 	router.Handle("/", logger(http.RedirectHandler("/notes/", http.StatusFound)))
 	router.Handle("/notes/", logger(http.StripPrefix("/notes", notesRouter)))
 	router.Handle(
 		"/static/",
 		logger(
-			http.FileServer(http.FS(conf.Static)),
+			middleware.StaticEtagMiddleware(
+				*etag,
+				http.FileServer(http.FS(conf.Static)),
+			),
 		),
 	)