Add Tailscale certificate API commands

protocol/tailscale/certificate.go

@@ -0,0 +1,22 @@
+//go:build with_gvisor
+
+package tailscale
+
+import (
+	"context"
+	"time"
+
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+func (t *Endpoint) GetTailscaleCertificate(ctx context.Context, domain string, minValidity time.Duration) ([]byte, []byte, error) {
+	if !t.started.Load() {
+		return nil, nil, E.New("Tailscale is not ready yet")
+	}
+	certificatePEM, privateKeyPEM, err := common.Must1(t.server.LocalClient()).CertPairWithValidity(ctx, domain, minValidity)
+	if err != nil {
+		return nil, nil, E.Cause(err, "tailscale certificate")
+	}
+	return certificatePEM, privateKeyPEM, nil
+}

protocol/tailscale/status.go

@@ -42,6 +42,7 @@ func (t *Endpoint) SubscribeTailscaleStatus(ctx context.Context, fn func(*adapte
 			result.WaitingFileCount = t.taildrop.waitingFileCount()
 			result.ReceivingFileCount = t.taildrop.receivingFileCount()
 			result.UnreadFileCount = t.taildrop.unreadFileCount()
+			result.CertDomains = t.server.CertDomains()
 			if len(taildropTargets) > 0 {
 				for _, group := range result.UserGroups {
 					for _, peer := range group.Peers {