chore: implement required FungibleTokenPacketData v3 interface methods

modules/apps/transfer/internal/denom/denom.go

@@ -1,9 +1,13 @@
 package denom
 
 import (
+	"fmt"
 	"strings"
 
+	errorsmod "cosmossdk.io/errors"
+
 	channeltypes "github.com/cosmos/ibc-go/v8/modules/core/04-channel/types"
+	host "github.com/cosmos/ibc-go/v8/modules/core/24-host"
 )
 
 // ExtractPathAndBaseFromFullDenom returns the trace path and the base denom from
@@ -37,3 +41,21 @@ func ExtractPathAndBaseFromFullDenom(fullDenomItems []string) ([]string, string)
 
 	return pathSlice, baseDenom
 }
+
+// ValidateTraceIdentifiers validates the correctness of the trace associated with a particular base denom.
+func ValidateTraceIdentifiers(identifiers []string) error {
+	if len(identifiers) == 0 || len(identifiers)%2 != 0 {
+		return fmt.Errorf("trace info must come in pairs of port and channel identifiers '{portID}/{channelID}', got the identifiers: %s", identifiers)
+	}
+
+	// validate correctness of port and channel identifiers
+	for i := 0; i < len(identifiers); i += 2 {
+		if err := host.PortIdentifierValidator(identifiers[i]); err != nil {
+			return errorsmod.Wrapf(err, "invalid port ID at position %d", i)
+		}
+		if err := host.ChannelIdentifierValidator(identifiers[i+1]); err != nil {
+			return errorsmod.Wrapf(err, "invalid channel ID at position %d", i)
+		}
+	}
+	return nil
+}

modules/apps/transfer/types/trace.go

@@ -15,7 +15,6 @@ import (
 	cmttypes "github.com/cometbft/cometbft/types"
 
 	denominternal "github.com/cosmos/ibc-go/v8/modules/apps/transfer/internal/denom"
-	host "github.com/cosmos/ibc-go/v8/modules/core/24-host"
 )
 
 // ParseDenomTrace parses a string with the ibc prefix (denom trace) and the base denomination
@@ -82,23 +81,6 @@ func (dt DenomTrace) IsNativeDenom() bool {
 	return dt.Path == ""
 }
 
-func validateTraceIdentifiers(identifiers []string) error {
-	if len(identifiers) == 0 || len(identifiers)%2 != 0 {
-		return fmt.Errorf("trace info must come in pairs of port and channel identifiers '{portID}/{channelID}', got the identifiers: %s", identifiers)
-	}
-
-	// validate correctness of port and channel identifiers
-	for i := 0; i < len(identifiers); i += 2 {
-		if err := host.PortIdentifierValidator(identifiers[i]); err != nil {
-			return errorsmod.Wrapf(err, "invalid port ID at position %d", i)
-		}
-		if err := host.ChannelIdentifierValidator(identifiers[i+1]); err != nil {
-			return errorsmod.Wrapf(err, "invalid channel ID at position %d", i)
-		}
-	}
-	return nil
-}
-
 // Validate performs a basic validation of the DenomTrace fields.
 func (dt DenomTrace) Validate() error {
 	// empty trace is accepted when token lives on the original chain
@@ -112,7 +94,7 @@ func (dt DenomTrace) Validate() error {
 	// NOTE: no base denomination validation
 
 	identifiers := strings.Split(dt.Path, "/")
-	return validateTraceIdentifiers(identifiers)
+	return denominternal.ValidateTraceIdentifiers(identifiers)
 }
 
 // Traces defines a wrapper type for a slice of DenomTrace.
@@ -178,7 +160,7 @@ func ValidatePrefixedDenom(denom string) error {
 	}
 
 	identifiers := strings.Split(path, "/")
-	return validateTraceIdentifiers(identifiers)
+	return denominternal.ValidateTraceIdentifiers(identifiers)
 }
 
 // ValidateIBCDenom validates that the given denomination is either:

modules/apps/transfer/types/v3/packet.go

@@ -1,6 +1,27 @@
 package v3
 
-// NewFungibleTokenPacketData constructs a new FungibleTokenPacketData instance
+import (
+	"encoding/json"
+	"errors"
+	"strings"
+
+	errorsmod "cosmossdk.io/errors"
+	sdkmath "cosmossdk.io/math"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
+	denominternal "github.com/cosmos/ibc-go/v8/modules/apps/transfer/internal/denom"
+	"github.com/cosmos/ibc-go/v8/modules/apps/transfer/types"
+	ibcerrors "github.com/cosmos/ibc-go/v8/modules/core/errors"
+	ibcexported "github.com/cosmos/ibc-go/v8/modules/core/exported"
+)
+
+var (
+	_ ibcexported.PacketData         = (*FungibleTokenPacketData)(nil)
+	_ ibcexported.PacketDataProvider = (*FungibleTokenPacketData)(nil)
+)
+
+// NewFungibleTokenPacketData constructs a new NewFungibleTokenPacketData instance
 func NewFungibleTokenPacketData(
 	tokens []*Token,
 	sender, receiver string,
@@ -13,3 +34,108 @@ func NewFungibleTokenPacketData(
 		Memo:     memo,
 	}
 }
+
+// ValidateBasic is used for validating the token transfer.
+// NOTE: The addresses formats are not validated as the sender and recipient can have different
+// formats defined by their corresponding chains that are not known to IBC.
+func (ftpd FungibleTokenPacketData) ValidateBasic() error {
+	if strings.TrimSpace(ftpd.Sender) == "" {
+		return errorsmod.Wrap(ibcerrors.ErrInvalidAddress, "sender address cannot be blank")
+	}
+
+	if strings.TrimSpace(ftpd.Receiver) == "" {
+		return errorsmod.Wrap(ibcerrors.ErrInvalidAddress, "receiver address cannot be blank")
+	}
+
+	if len(ftpd.Tokens) == 0 {
+		return errorsmod.Wrap(types.ErrInvalidAmount, "tokens cannot be empty")
+	}
+
+	for _, token := range ftpd.Tokens {
+		amount, ok := sdkmath.NewIntFromString(token.Amount)
+		if !ok {
+			return errorsmod.Wrapf(types.ErrInvalidAmount, "unable to parse transfer amount (%s) into math.Int", token.Amount)
+		}
+
+		if !amount.IsPositive() {
+			return errorsmod.Wrapf(types.ErrInvalidAmount, "amount must be strictly positive: got %d", amount)
+		}
+
+		if err := token.Validate(); err != nil {
+			return err
+		}
+	}
+
+	if len(ftpd.Memo) > types.MaximumMemoLength {
+		return errorsmod.Wrapf(types.ErrInvalidMemo, "memo must not exceed %d bytes", types.MaximumMemoLength)
+	}
+
+	return nil
+}
+
+// ValidateToken validates a token denomination and trace identifiers.
+func (t *Token) Validate() error {
+	if err := sdk.ValidateDenom(t.Denom); err != nil {
+		return errorsmod.Wrap(types.ErrInvalidDenomForTransfer, err.Error())
+	}
+
+	trace := strings.Join(t.Trace, "/")
+	identifiers := strings.Split(trace, "/")
+
+	return denominternal.ValidateTraceIdentifiers(identifiers)
+}
+
+// GetFullDenomPath returns the full denomination according to the ICS20 specification:
+// tracePath + "/" + baseDenom
+// If there exists no trace then the base denomination is returned.
+func (t *Token) GetFullDenomPath() string {
+	trace := strings.Join(t.Trace, "/")
+	if len(trace) == 0 {
+		return t.Denom
+	}
+
+	return strings.Join(append(t.Trace, t.Denom), "/")
+}
+
+// GetBytes is a helper for serialising
+func (ftpd FungibleTokenPacketData) GetBytes() []byte {
+	bz, err := json.Marshal(&ftpd)
+	if err != nil {
+		panic(errors.New("cannot marshal v3 FungibleTokenPacketData into bytes"))
+	}
+
+	return bz
+}
+
+// GetCustomPacketData interprets the memo field of the packet data as a JSON object
+// and returns the value associated with the given key.
+// If the key is missing or the memo is not properly formatted, then nil is returned.
+func (ftpd FungibleTokenPacketData) GetCustomPacketData(key string) interface{} {
+	if len(ftpd.Memo) == 0 {
+		return nil
+	}
+
+	jsonObject := make(map[string]interface{})
+	err := json.Unmarshal([]byte(ftpd.Memo), &jsonObject)
+	if err != nil {
+		return nil
+	}
+
+	memoData, found := jsonObject[key]
+	if !found {
+		return nil
+	}
+
+	return memoData
+}
+
+// GetPacketSender returns the sender address embedded in the packet data.
+//
+// NOTE:
+//   - The sender address is set by the module which requested the packet to be sent,
+//     and this module may not have validated the sender address by a signature check.
+//   - The sender address must only be used by modules on the sending chain.
+//   - sourcePortID is not used in this implementation.
+func (ftpd FungibleTokenPacketData) GetPacketSender(sourcePortID string) string {
+	return ftpd.Sender
+}