Inbound rule support

adapter/route/rule.go

@@ -0,0 +1,55 @@
+package route
+
+import (
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
+	F "github.com/sagernet/sing/common/format"
+)
+
+var _ adapter.Rule = (*DefaultRule)(nil)
+
+type DefaultRule struct {
+	index    int
+	outbound string
+	items    []RuleItem
+}
+
+type RuleItem interface {
+	Match(metadata adapter.InboundContext) bool
+	String() string
+}
+
+func NewDefaultRule(index int, options option.DefaultRule) *DefaultRule {
+	rule := &DefaultRule{
+		index:    index,
+		outbound: options.Outbound,
+	}
+	if len(options.Inbound) > 0 {
+		rule.items = append(rule.items, NewInboundRule(options.Inbound))
+	}
+	return rule
+}
+
+func (r *DefaultRule) Match(metadata adapter.InboundContext) bool {
+	for _, item := range r.items {
+		if item.Match(metadata) {
+			return true
+		}
+	}
+	return false
+}
+
+func (r *DefaultRule) Outbound() string {
+	return r.outbound
+}
+
+func (r *DefaultRule) String() string {
+	var description string
+	description = F.ToString("[", r.index, "]")
+	for _, item := range r.items {
+		description += " "
+		description += item.String()
+	}
+	description += " => " + r.outbound
+	return description
+}