Add api command

cmd/sing-box/cmd_api_openvpn.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"io"
+
+	"github.com/sagernet/sing-box/daemon"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+const (
+	openVPNChallengeCredentials = "credentials"
+	openVPNChallengeSecret      = "secret"
+	openVPNChallengeMessage     = "message"
+	openVPNChallengeOpenURL     = "open-url"
+)
+
+var commandAPIOpenVPN = &cobra.Command{
+	Use:   "openvpn",
+	Short: "Manage OpenVPN authentication",
+}
+
+func init() {
+	commandAPIRoot.AddCommand(commandAPIOpenVPN)
+}
+
+func subscribeOpenVPNStatus(ctx context.Context, client daemon.StartedServiceClient) (grpc.ServerStreamingClient[daemon.OpenVPNStatusUpdate], []*daemon.OpenVPNEndpointStatus, error) {
+	stream, err := client.SubscribeOpenVPNStatus(ctx, &emptypb.Empty{})
+	if err != nil {
+		return nil, nil, err
+	}
+	endpoints, err := recvOpenVPNStatus(stream)
+	if err != nil {
+		return nil, nil, err
+	}
+	return stream, endpoints, nil
+}
+
+func recvOpenVPNStatus(stream grpc.ServerStreamingClient[daemon.OpenVPNStatusUpdate]) ([]*daemon.OpenVPNEndpointStatus, error) {
+	update, err := stream.Recv()
+	if err != nil {
+		if errors.Is(err, io.EOF) {
+			return nil, E.New("api service closed the status stream")
+		}
+		return nil, err
+	}
+	return update.GetEndpoints(), nil
+}
+
+func openVPNChallengeSummary(challenge *daemon.OpenVPNChallenge) string {
+	switch challenge.GetKind() {
+	case openVPNChallengeMessage, openVPNChallengeOpenURL:
+		return challenge.GetKind() + " (not answerable)"
+	default:
+		return challenge.GetKind()
+	}
+}