Add resolver for outbound dialer

route/rule_outbound.go

@@ -0,0 +1,36 @@
+package route
+
+import (
+	"strings"
+
+	F "github.com/sagernet/sing/common/format"
+
+	"github.com/sagernet/sing-box/adapter"
+)
+
+var _ RuleItem = (*OutboundItem)(nil)
+
+type OutboundItem struct {
+	outbounds   []string
+	outboundMap map[string]bool
+}
+
+func NewOutboundRule(outbounds []string) *OutboundItem {
+	rule := &OutboundItem{outbounds, make(map[string]bool)}
+	for _, outbound := range outbounds {
+		rule.outboundMap[outbound] = true
+	}
+	return rule
+}
+
+func (r *OutboundItem) Match(metadata *adapter.InboundContext) bool {
+	return r.outboundMap[metadata.Outbound]
+}
+
+func (r *OutboundItem) String() string {
+	if len(r.outbounds) == 1 {
+		return F.ToString("outbound=", r.outbounds[0])
+	} else {
+		return F.ToString("outbound=[", strings.Join(r.outbounds, " "), "]")
+	}
+}