feat: add metadata for IBC tokens

modules/apps/transfer/keeper/relay.go

@@ -9,6 +9,7 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 	"github.com/cosmos/ibc-go/v7/modules/apps/transfer/types"
 	clienttypes "github.com/cosmos/ibc-go/v7/modules/core/02-client/types"
 	channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
@@ -282,6 +283,24 @@ func (k Keeper) OnRecvPacket(ctx sdk.Context, packet channeltypes.Packet, data t
 		return err
 	}
 
+	if !k.bankKeeper.HasDenomMetaData(ctx, voucherDenom) {
+		metadata := banktypes.Metadata{
+			Description: getMetaDataDescription(denomTrace),
+			DenomUnits: []*banktypes.DenomUnit{
+				{
+					Denom:    denomTrace.BaseDenom,
+					Exponent: 0,
+				},
+			},
+			// Setting base as IBChash Denom as SetDenomMetaData uses Base as storeKey
+			// and the bank keeper will only have the IBCHash to get the denom metadata
+			Base:    voucherDenom,
+			Display: prefixedDenom,
+		}
+
+		k.bankKeeper.SetDenomMetaData(ctx, metadata)
+	}
+
 	// send to receiver
 	if err := k.bankKeeper.SendCoinsFromModuleToAccount(
 		ctx, types.ModuleName, receiver, sdk.NewCoins(voucher),
@@ -310,6 +329,10 @@ func (k Keeper) OnRecvPacket(ctx sdk.Context, packet channeltypes.Packet, data t
 	return nil
 }
 
+func getMetaDataDescription(denomTrace types.DenomTrace) string {
+	return fmt.Sprintf("IBC Token from %s", denomTrace.Path)
+}
+
 // OnAcknowledgementPacket responds to the the success or failure of a packet
 // acknowledgement written on the receiving chain. If the acknowledgement
 // was a success then nothing occurs. If the acknowledgement failed, then

modules/apps/transfer/types/expected_keepers.go

@@ -3,6 +3,7 @@ package types
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 	capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
 
 	connectiontypes "github.com/cosmos/ibc-go/v7/modules/core/03-connection/types"
@@ -25,6 +26,8 @@ type BankKeeper interface {
 	SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error
 	BlockedAddr(addr sdk.AccAddress) bool
 	IsSendEnabledCoin(ctx sdk.Context, coin sdk.Coin) bool
+	HasDenomMetaData(ctx sdk.Context, denom string) bool
+	SetDenomMetaData(ctx sdk.Context, denomMetaData banktypes.Metadata)
 }
 
 // ChannelKeeper defines the expected IBC channel keeper