Add resolver for outbound dialer

common/dialer/dialer.go

@@ -0,0 +1,28 @@
+package dialer
+
+import (
+	"github.com/sagernet/sing/common"
+	N "github.com/sagernet/sing/common/network"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+)
+
+func New(router adapter.Router, options option.DialerOptions) N.Dialer {
+	domainStrategy := C.DomainStrategy(options.DomainStrategy)
+	var dialer N.Dialer
+	if options.Detour == "" {
+		dialer = NewDefault(options)
+		dialer = NewResolveDialer(router, dialer, domainStrategy)
+	} else {
+		dialer = NewDetour(router, options.Detour)
+		if domainStrategy != C.DomainStrategyAsIS {
+			dialer = NewResolveDialer(router, dialer, domainStrategy)
+		}
+	}
+	if options.OverrideOptions.IsValid() {
+		dialer = NewOverride(dialer, common.PtrValueOrDefault(options.OverrideOptions))
+	}
+	return dialer
+}