chore: init bj_power monorepo (dashboard/mes/wms/wms_client/workstation), clear subproject git metadata and align naming to folder names

bj_power_mes/common/httpx/not_found.go

@@ -0,0 +1,48 @@
+package xhttp
+
+import (
+	"net/http"
+	"os"
+	"path"
+	"strings"
+)
+
+const basename = "/"
+
+type NotFoundHandler struct {
+	fs         http.FileSystem
+	fileServer http.Handler
+}
+
+func NewNotFoundHandler(fs http.FileSystem) NotFoundHandler {
+	return NotFoundHandler{
+		fs:         fs,
+		fileServer: http.FileServer(fs),
+	}
+}
+
+func (n NotFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if strings.HasPrefix(r.URL.Path, "/api/") {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	filePath := strings.TrimPrefix(path.Clean(r.URL.Path), basename)
+	if len(filePath) == 0 {
+		filePath = basename
+	}
+
+	file, err := n.fs.Open(filePath)
+	switch {
+	case err == nil:
+		n.fileServer.ServeHTTP(w, r)
+		_ = file.Close()
+		return
+	case os.IsNotExist(err):
+		r.URL.Path = "/" // all virtual routes in react app means visit index.html
+		n.fileServer.ServeHTTP(w, r)
+		return
+	default:
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+}