Add ssm api server

experimental/ssmapi.go

@@ -0,0 +1,24 @@
+package experimental
+
+import (
+	"os"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+)
+
+type SSMServerConstructor = func(router adapter.Router, logger log.Logger, options option.SSMAPIOptions) (adapter.SSMServer, error)
+
+var ssmServerConstructor SSMServerConstructor
+
+func RegisterSSMServerConstructor(constructor SSMServerConstructor) {
+	ssmServerConstructor = constructor
+}
+
+func NewSSMServer(router adapter.Router, logger log.Logger, options option.SSMAPIOptions) (adapter.SSMServer, error) {
+	if ssmServerConstructor == nil {
+		return nil, os.ErrInvalid
+	}
+	return ssmServerConstructor(router, logger, options)
+}