fix(fs): panic when failed to get storage details (#1964)

drivers/115_open/driver.go

@@ -331,11 +331,11 @@ func (d *Open115) GetDetails(ctx context.Context) (*model.StorageDetails, error)
 	if err != nil {
 		return nil, err
 	}
-	total, err := userInfo.RtSpaceInfo.AllTotal.Size.Int64()
+	total, err := ParseInt64(userInfo.RtSpaceInfo.AllTotal.Size)
 	if err != nil {
 		return nil, err
 	}
-	used, err := userInfo.RtSpaceInfo.AllUse.Size.Int64()
+	used, err := ParseInt64(userInfo.RtSpaceInfo.AllUse.Size)
 	if err != nil {
 		return nil, err
 	}

drivers/115_open/util.go

@@ -1,3 +1,15 @@
 package _115_open
 
-// do others that not defined in Driver interface
+import "encoding/json"
+
+func ParseInt64(v json.Number) (int64, error) {
+	i, err := v.Int64()
+	if err == nil {
+		return i, nil
+	}
+	f, e1 := v.Float64()
+	if e1 == nil {
+		return int64(f), nil
+	}
+	return int64(0), err
+}