From e4d508b725f22325cf60dc8d5b1a30387a464507 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Sun, 12 May 2024 00:20:16 +0800
Subject: [PATCH] Remove null outbounds in group references

---
 .../filter/filter_null_group_reference.go     | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 template/filter/filter_null_group_reference.go

diff --git a/template/filter/filter_null_group_reference.go b/template/filter/filter_null_group_reference.go
new file mode 100644
index 0000000..bcfc38c
--- /dev/null
+++ b/template/filter/filter_null_group_reference.go
@@ -0,0 +1,33 @@
+package filter
+
+import (
+	M "github.com/sagernet/serenity/common/metadata"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common"
+)
+
+func init() {
+	filters = append(filters, filterNullGroupReference)
+}
+
+func filterNullGroupReference(metadata M.Metadata, options *option.Options) {
+	outboundTags := common.Map(options.Outbounds, func(it option.Outbound) string {
+		return it.Tag
+	})
+	for i, outbound := range options.Outbounds {
+		switch outbound.Type {
+		case C.TypeSelector:
+			outbound.SelectorOptions.Outbounds = common.Filter(outbound.SelectorOptions.Outbounds, func(outbound string) bool {
+				return common.Contains(outboundTags, outbound)
+			})
+		case C.TypeURLTest:
+			outbound.URLTestOptions.Outbounds = common.Filter(outbound.URLTestOptions.Outbounds, func(outbound string) bool {
+				return common.Contains(outboundTags, outbound)
+			})
+		default:
+			continue
+		}
+		options.Outbounds[i] = outbound
+	}
+}