refactor: update static file serving middleware to improve functionality

internal/middleware/embed.go

@@ -9,21 +9,39 @@ import (
 
 	"github.com/0xJacky/Nginx-UI/app"
 	"github.com/gin-contrib/static"
+	"github.com/gin-gonic/gin"
 	"github.com/uozi-tech/cosy/logger"
 )
 
-func MustFs(dir string) (serverFileSystem static.ServeFileSystem) {
-
+func mustFs(dir string) (serverFileSystem static.ServeFileSystem) {
 	sub, err := fs.Sub(app.DistFS, path.Join("dist", dir))
-
 	if err != nil {
 		logger.Error(err)
 		return
 	}
-
 	serverFileSystem = ServerFileSystemType{
 		http.FS(sub),
 	}
-
 	return
 }
+
+func ServeStatic() []gin.HandlerFunc {
+	const urlPrefix = "/"
+	fs := mustFs(urlPrefix)
+	fileserver := http.FileServer(fs)
+	if urlPrefix != "" {
+		fileserver = http.StripPrefix(urlPrefix, fileserver)
+	}
+	return []gin.HandlerFunc{
+		func(c *gin.Context) {
+			if fs.Exists(urlPrefix, c.Request.URL.Path) {
+				c.Next()
+			}
+		},
+		IPWhiteList(),
+		func(c *gin.Context) {
+			fileserver.ServeHTTP(c.Writer, c.Request)
+			c.Abort()
+		},
+	}
+}