Improve QUIC sniffer

route/rule_item_client.go

@@ -0,0 +1,37 @@
+package route
+
+import (
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	F "github.com/sagernet/sing/common/format"
+)
+
+var _ RuleItem = (*ClientItem)(nil)
+
+type ClientItem struct {
+	clients   []string
+	clientMap map[string]bool
+}
+
+func NewClientItem(clients []string) *ClientItem {
+	clientMap := make(map[string]bool)
+	for _, client := range clients {
+		clientMap[client] = true
+	}
+	return &ClientItem{
+		clients:   clients,
+		clientMap: clientMap,
+	}
+}
+
+func (r *ClientItem) Match(metadata *adapter.InboundContext) bool {
+	return r.clientMap[metadata.Client]
+}
+
+func (r *ClientItem) String() string {
+	if len(r.clients) == 1 {
+		return F.ToString("client=", r.clients[0])
+	}
+	return F.ToString("client=[", strings.Join(r.clients, " "), "]")
+}