Add BrowserCacheMiddleware to improve static file caching, excluding specific files like robots.txt for better performance

internal/view/middleware/browser_cache.go

@@ -0,0 +1,38 @@
+package middleware
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/labstack/echo/v4"
+)
+
+type BrowserCacheMiddlewareConfig struct {
+	CacheDuration time.Duration
+	ExcludedFiles []string
+}
+
+// NewBrowserCacheMiddleware creates a new CacheMiddleware with the specified
+// cache duration and a list of excluded files that will bypass the cache.
+func (Middleware) NewBrowserCacheMiddleware(
+	config BrowserCacheMiddlewareConfig,
+) echo.MiddlewareFunc {
+	return func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			path := c.Request().URL.Path
+			for _, excluded := range config.ExcludedFiles {
+				if path == excluded {
+					return next(c)
+				}
+			}
+
+			cacheDuration := config.CacheDuration
+			c.Response().Header().Set(
+				"Cache-Control",
+				"public, max-age="+strconv.Itoa(int(cacheDuration.Seconds())),
+			)
+
+			return next(c)
+		}
+	}
+}

internal/view/router.go

@@ -1,6 +1,8 @@
 package view
 
 import (
+	"time"
+
 	"github.com/eduardolat/pgbackweb/internal/service"
 	"github.com/eduardolat/pgbackweb/internal/view/api"
 	"github.com/eduardolat/pgbackweb/internal/view/middleware"
@@ -12,7 +14,13 @@ import (
 func MountRouter(app *echo.Echo, servs *service.Service) {
 	mids := middleware.New(servs)
 
-	app.StaticFS("", static.StaticFs)
+	browserCache := mids.NewBrowserCacheMiddleware(
+		middleware.BrowserCacheMiddlewareConfig{
+			CacheDuration: time.Hour * 24 * 30,
+			ExcludedFiles: []string{"/robots.txt"},
+		},
+	)
+	app.Group("", browserCache).StaticFS("", static.StaticFs)
 
 	apiGroup := app.Group("/api")
 	api.MountRouter(apiGroup, mids, servs)