Fix old proto compatibility (#213)

pkg/transports/anypb_nourl.go

@@ -2,6 +2,7 @@ package transports
 
 import (
 	"fmt"
+	"strings"
 
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoreflect"
@@ -17,6 +18,8 @@ func UnmarshalAnypbTo(src *anypb.Any, dst protoreflect.ProtoMessage) error {
 		return fmt.Errorf("error reading src type: %v", err)
 	}
 
+	src.TypeUrl = strings.ReplaceAll(src.TypeUrl, "tapdance.", "proto.")
+
 	if src.TypeUrl != "" && src.TypeUrl != expected.TypeUrl {
 		return fmt.Errorf("incorrect non-empty TypeUrl: %v != %v", src.TypeUrl, expected.TypeUrl)
 	}

pkg/transports/anypb_nourl_test.go

@@ -2,6 +2,7 @@ package transports_test
 
 import (
 	"crypto/rand"
+	"strings"
 	"testing"
 
 	"github.com/refraction-networking/conjure/pkg/transports"
@@ -55,3 +56,16 @@ func TestGarbage(t *testing.T) {
 	err = proto.Unmarshal(garbagebytes, dstAnypb)
 	require.NotNil(t, err)
 }
+
+func TestOldProto(t *testing.T) {
+	src, err := anypb.New(&pb.GenericTransportParams{RandomizeDstPort: proto.Bool(true)})
+	require.Nil(t, err)
+
+	src.TypeUrl = strings.ReplaceAll(src.TypeUrl, "proto.", "tapdance.")
+
+	dst := &pb.GenericTransportParams{}
+	err = transports.UnmarshalAnypbTo(src, dst)
+	require.Nil(t, err)
+
+	require.True(t, dst.GetRandomizeDstPort())
+}