taprpc: add marshal functions for universe RPC types

taprpc/universerpc/marshal.go

@@ -0,0 +1,44 @@
+package universerpc
+
+import (
+	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/btcsuite/btcd/wire"
+	"github.com/lightninglabs/taproot-assets/asset"
+)
+
+// MarshalOutpoint marshals a wire.OutPoint into an RPC ready Outpoint.
+//
+// TODO(ffranr): Move this package's Outpoint type and this marshal function to
+// somewhere more general.
+func MarshalOutpoint(outPoint wire.OutPoint) *Outpoint {
+	return &Outpoint{
+		HashStr: outPoint.Hash.String(),
+		Index:   int32(outPoint.Index),
+	}
+}
+
+// MarshalAssetKey returns an RPC ready AssetKey.
+func MarshalAssetKey(outPoint wire.OutPoint,
+	scriptKeyPubKey *btcec.PublicKey) *AssetKey {
+
+	scriptKeyBytes := scriptKeyPubKey.SerializeCompressed()
+
+	return &AssetKey{
+		Outpoint: &AssetKey_Op{
+			Op: MarshalOutpoint(outPoint),
+		},
+		ScriptKey: &AssetKey_ScriptKeyBytes{
+			ScriptKeyBytes: scriptKeyBytes,
+		},
+	}
+}
+
+// MarshalUniverseID returns an RPC ready universe ID.
+func MarshalUniverseID(assetID asset.ID) *ID {
+	// TODO(ffranr): Determine whether to use asset ID or group key.
+	return &ID{
+		Id: &ID_AssetId{
+			AssetId: assetID[:],
+		},
+	}
+}