Refactor to omit empty optionals from EIP-712 type generation (#1459)

* Refactor to omit empty values from type creation; add test for v1.vote

* Add test for createValidator with optional fields left blank

* Add changelog entry

* Update changelog entry

Co-authored-by: Freddy Caceres <facs95@gmail.com>

CHANGELOG.md

@@ -47,6 +47,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (eth) [#1346](https://github.com/evmos/ethermint/pull/1346) Added support for `sdk.Dec` and `ed25519` type on eip712.
 * (eth) [#1430](https://github.com/evmos/ethermint/pull/1430) Added support for array of type `Any` on eip712. 
 * (ante) [1460](https://github.com/evmos/ethermint/pull/1460) Add KV Gas config on ethereum Txs.
+* (eth) [#1459](https://github.com/evmos/ethermint/pull/1459) Added support for messages with optional types omitted on eip712.
 * (geth) [#1413](https://github.com/evmos/ethermint/pull/1413) Update geth version to v1.10.25.
 
 ### API Breaking

app/ante/ante_test.go

@@ -349,6 +349,17 @@ func (suite AnteTestSuite) TestAnteHandler() {
 				return txBuilder.GetTx()
 			}, false, false, true,
 		},
+		{
+			"success- DeliverTx EIP712 create validator (with blank fields)",
+			func() sdk.Tx {
+				from := acc.GetAddress()
+				coinAmount := sdk.NewCoin(evmtypes.DefaultEVMDenom, sdk.NewInt(20))
+				amount := sdk.NewCoins(coinAmount)
+				gas := uint64(200000)
+				txBuilder := suite.CreateTestEIP712MsgCreateValidator2(from, privKey, "ethermint_9000-1", gas, amount)
+				return txBuilder.GetTx()
+			}, false, false, true,
+		},
 		{
 			"success- DeliverTx EIP712 MsgSubmitProposal",
 			func() sdk.Tx {
@@ -435,6 +446,17 @@ func (suite AnteTestSuite) TestAnteHandler() {
 				return txBuilder.GetTx()
 			}, false, false, true,
 		},
+		{
+			"success- DeliverTx EIP712 MsgVoteV1",
+			func() sdk.Tx {
+				from := acc.GetAddress()
+				coinAmount := sdk.NewCoin(evmtypes.DefaultEVMDenom, sdk.NewInt(20))
+				amount := sdk.NewCoins(coinAmount)
+				gas := uint64(200000)
+				txBuilder := suite.CreateTestEIP712MsgVoteV1(from, privKey, "ethermint_9000-1", gas, amount)
+				return txBuilder.GetTx()
+			}, false, false, true,
+		},
 		{
 			"fails - DeliverTx EIP712 signed Cosmos Tx with wrong Chain ID",
 			func() sdk.Tx {

app/ante/utils_test.go

@@ -291,7 +291,6 @@ func (suite *AnteTestSuite) CreateTestEIP712MsgCreateValidator(from sdk.AccAddre
 		valAddr,
 		privEd.PubKey(),
 		sdk.NewCoin(evmtypes.DefaultEVMDenom, sdk.NewInt(20)),
-		// TODO: can this values be empty strings?
 		types3.NewDescription("moniker", "indentity", "website", "security_contract", "details"),
 		types3.NewCommissionRates(sdk.OneDec(), sdk.OneDec(), sdk.OneDec()),
 		sdk.OneInt(),
@@ -300,6 +299,23 @@ func (suite *AnteTestSuite) CreateTestEIP712MsgCreateValidator(from sdk.AccAddre
 	return suite.CreateTestEIP712CosmosTxBuilder(from, priv, chainId, gas, gasAmount, msgCreate)
 }
 
+func (suite *AnteTestSuite) CreateTestEIP712MsgCreateValidator2(from sdk.AccAddress, priv cryptotypes.PrivKey, chainId string, gas uint64, gasAmount sdk.Coins) client.TxBuilder {
+	// Build MsgCreateValidator
+	valAddr := sdk.ValAddress(from.Bytes())
+	privEd := ed25519.GenPrivKey()
+	msgCreate, err := types3.NewMsgCreateValidator(
+		valAddr,
+		privEd.PubKey(),
+		sdk.NewCoin(evmtypes.DefaultEVMDenom, sdk.NewInt(20)),
+		// Ensure optional fields can be left blank
+		types3.NewDescription("moniker", "indentity", "", "", ""),
+		types3.NewCommissionRates(sdk.OneDec(), sdk.OneDec(), sdk.OneDec()),
+		sdk.OneInt(),
+	)
+	suite.Require().NoError(err)
+	return suite.CreateTestEIP712CosmosTxBuilder(from, priv, chainId, gas, gasAmount, msgCreate)
+}
+
 func (suite *AnteTestSuite) CreateTestEIP712SubmitProposal(from sdk.AccAddress, priv cryptotypes.PrivKey, chainId string, gas uint64, gasAmount sdk.Coins, deposit sdk.Coins) client.TxBuilder {
 	proposal, ok := types5.ContentFromProposalType("My proposal", "My description", types5.ProposalTypeText)
 	suite.Require().True(ok)
@@ -346,6 +362,11 @@ func (suite *AnteTestSuite) CreateTestEIP712MsgSubmitEvidence(from sdk.AccAddres
 	return suite.CreateTestEIP712CosmosTxBuilder(from, priv, chainId, gas, gasAmount, msgEvidence)
 }
 
+func (suite *AnteTestSuite) CreateTestEIP712MsgVoteV1(from sdk.AccAddress, priv cryptotypes.PrivKey, chainId string, gas uint64, gasAmount sdk.Coins) client.TxBuilder {
+	msgVote := govtypes.NewMsgVote(from, 1, govtypes.VoteOption_VOTE_OPTION_YES, "")
+	return suite.CreateTestEIP712CosmosTxBuilder(from, priv, chainId, gas, gasAmount, msgVote)
+}
+
 func (suite *AnteTestSuite) CreateTestEIP712SubmitProposalV1(from sdk.AccAddress, priv cryptotypes.PrivKey, chainId string, gas uint64, gasAmount sdk.Coins) client.TxBuilder {
 	// Build V1 proposal messages. Must all be same-type, since EIP-712
 	// does not support arrays of variable type.

ethereum/eip712/eip712.go

@@ -207,8 +207,8 @@ func traverseFields(
 			}
 		}
 
-		// If its a nil pointer, do not include in types
+		// If field is an empty value, do not include in types, since it will not be present in the object
-		if fieldType.Kind() == reflect.Ptr && field.IsNil() {
+		if field.IsZero() {
 			continue
 		}