platform: Add openURL event

experimental/libbox/command_event.go

@@ -0,0 +1,40 @@
+package libbox
+
+import (
+	"encoding/binary"
+
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/varbin"
+)
+
+type myEvent interface {
+	writeTo(writer varbin.Writer)
+}
+
+func readEvent(reader varbin.Reader) (myEvent, error) {
+	eventType, err := reader.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+	switch eventType {
+	case eventTypeEmpty:
+		return nil, nil
+	case eventTypeOpenURL:
+		url, err := varbin.ReadValue[string](reader, binary.BigEndian)
+		if err != nil {
+			return nil, err
+		}
+		return &eventOpenURL{URL: url}, nil
+	default:
+		return nil, E.New("unknown event type: ", eventType)
+	}
+}
+
+type eventOpenURL struct {
+	URL string
+}
+
+func (e *eventOpenURL) writeTo(writer varbin.Writer) {
+	writer.WriteByte(eventTypeOpenURL)
+	varbin.Write(writer, binary.BigEndian, e.URL)
+}