Refactor: Rename NanoKVM to BatchuKVM and update server URL

server/service/application/preview.go

@@ -0,0 +1,60 @@
+package application
+
+import (
+	"NanoKVM-Server/proto"
+	"os"
+
+	"github.com/gin-gonic/gin"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	PreviewUpdatesFlag = "/etc/kvm/preview_updates"
+)
+
+func (s *Service) GetPreview(c *gin.Context) {
+	var rsp proto.Response
+
+	isEnabled := isPreviewEnabled()
+
+	rsp.OkRspWithData(c, &proto.GetPreviewRsp{
+		Enabled: isEnabled,
+	})
+}
+
+func (s *Service) SetPreview(c *gin.Context) {
+	var req proto.SetPreviewReq
+	var rsp proto.Response
+
+	if err := proto.ParseFormRequest(c, &req); err != nil {
+		rsp.ErrRsp(c, -1, "invalid arguments")
+		return
+	}
+
+	if req.Enable == isPreviewEnabled() {
+		rsp.OkRsp(c)
+		return
+	}
+
+	if req.Enable {
+		if err := os.WriteFile(PreviewUpdatesFlag, []byte("1"), 0o644); err != nil {
+			log.Errorf("failed to write %s: %s", PreviewUpdatesFlag, err)
+			rsp.ErrRsp(c, -2, "enable failed")
+			return
+		}
+	} else {
+		if err := os.Remove(PreviewUpdatesFlag); err != nil {
+			log.Errorf("failed to remove %s: %s", PreviewUpdatesFlag, err)
+			rsp.ErrRsp(c, -3, "disable failed")
+			return
+		}
+	}
+
+	rsp.OkRsp(c)
+	log.Debugf("set preview updates state: %t", req.Enable)
+}
+
+func isPreviewEnabled() bool {
+	_, err := os.Stat(PreviewUpdatesFlag)
+	return err == nil
+}