feat(evmutil): add ERC20KavaWrappedNativeCoinContract (#1591)

* feat(evmutil): add ERC20KavaWrappedNativeCoinContract

* adds the contract ABI & bytecode for an Ownable erc20 with the following:
  * customizable decimals on deploy -> requires overriding decimals() view
  * mint() exposed for the contract owner which will be the evmutil module
  * burn() exposed for the contract owner which will be the evmutil module
* sets up keeper to deploy above token based on details from an
  AllowedNativeCoinERC20Token
* tests basic queries and permissions of deployed contract

* update changelog

* improve error messages & comments for erc20 deploy

CHANGELOG.md

@@ -38,6 +38,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## Features
 - (evmutil) [#1590] Add allow list param of sdk native denoms that can be transferred to evm
+- (evmutil) [#1591] Configure module to support deploying ERC20KavaWrappedNativeCoin contracts
 
 ## [v0.23.0]
 
@@ -240,6 +241,7 @@ the [changelog](https://github.com/cosmos/cosmos-sdk/blob/v0.38.4/CHANGELOG.md).
 - [#257](https://github.com/Kava-Labs/kava/pulls/257) Include scripts to run
   large-scale simulations remotely using aws-batch
 
+[#1591]: https://github.com/Kava-Labs/kava/pull/1591
 [#1590]: https://github.com/Kava-Labs/kava/pull/1590
 [#1568]: https://github.com/Kava-Labs/kava/pull/1568
 [#1567]: https://github.com/Kava-Labs/kava/pull/1567

x/evmutil/keeper/erc20.go

@@ -1,6 +1,7 @@
 package keeper
 
 import (
+	"encoding/hex"
 	"fmt"
 	"math/big"
 
@@ -64,6 +65,51 @@ func (k Keeper) DeployTestMintableERC20Contract(
 	return types.NewInternalEVMAddress(contractAddr), nil
 }
 
+// DeployKavaWrappedNativeCoinERC20Contract validates token details and then deploys an ERC20
+// contract with the token metadata.
+// This method does NOT check if a token for the provided SdkDenom has already been deployed.
+func (k Keeper) DeployKavaWrappedNativeCoinERC20Contract(
+	ctx sdk.Context,
+	token types.AllowedNativeCoinERC20Token,
+) (types.InternalEVMAddress, error) {
+	if err := token.Validate(); err != nil {
+		return types.InternalEVMAddress{}, errorsmod.Wrapf(err, "failed to deploy erc20 for sdk denom %s", token.SdkDenom)
+	}
+
+	packedAbi, err := types.ERC20KavaWrappedNativeCoinContract.ABI.Pack(
+		"", // Empty string for contract constructor
+		token.Name,
+		token.Symbol,
+		uint8(token.Decimals), // cast to uint8 is safe because of Validate()
+	)
+	if err != nil {
+		return types.InternalEVMAddress{}, errorsmod.Wrapf(err, "failed to pack token with details %+v", token)
+	}
+
+	data := make([]byte, len(types.ERC20KavaWrappedNativeCoinContract.Bin)+len(packedAbi))
+	copy(
+		data[:len(types.ERC20KavaWrappedNativeCoinContract.Bin)],
+		types.ERC20KavaWrappedNativeCoinContract.Bin,
+	)
+	copy(
+		data[len(types.ERC20KavaWrappedNativeCoinContract.Bin):],
+		packedAbi,
+	)
+
+	nonce, err := k.accountKeeper.GetSequence(ctx, types.ModuleEVMAddress.Bytes())
+	if err != nil {
+		return types.InternalEVMAddress{}, err
+	}
+
+	contractAddr := crypto.CreateAddress(types.ModuleEVMAddress, nonce)
+	_, err = k.CallEVMWithData(ctx, types.ModuleEVMAddress, nil, data)
+	if err != nil {
+		return types.InternalEVMAddress{}, fmt.Errorf("failed to deploy ERC20 %s (nonce=%d, data=%s): %s", token.Name, nonce, hex.EncodeToString(data), err)
+	}
+
+	return types.NewInternalEVMAddress(contractAddr), nil
+}
+
 // MintERC20 mints the given amount of an ERC20 token to an address. This is
 // unchecked and should only be called after permission and enabled ERC20 checks.
 func (k Keeper) MintERC20(

x/evmutil/keeper/erc20_test.go

@@ -84,3 +84,64 @@ func (suite *ERC20TestSuite) TestERC20Mint() {
 	suite.Require().True(ok, "balanceOf should respond with *big.Int")
 	suite.Require().Equal(big.NewInt(1234), balance)
 }
+
+func (suite *ERC20TestSuite) TestDeployKavaWrappedNativeCoinERC20Contract() {
+	suite.Run("fails to deploy invalid contract", func() {
+		// empty other fields means this token is invalid.
+		invalidToken := types.AllowedNativeCoinERC20Token{SdkDenom: "nope"}
+		_, err := suite.Keeper.DeployKavaWrappedNativeCoinERC20Contract(suite.Ctx, invalidToken)
+		suite.ErrorContains(err, "token's name cannot be empty")
+	})
+
+	suite.Run("deploys contract with expected metadata & permissions", func() {
+		caller, privKey := suite.RandomAccount()
+
+		token := types.NewAllowedNativeCoinERC20Token("hard", "EVM HARD", "HARD", 6)
+		addr, err := suite.Keeper.DeployKavaWrappedNativeCoinERC20Contract(suite.Ctx, token)
+		suite.NoError(err)
+		suite.NotNil(addr)
+
+		callContract := func(method string, args ...interface{}) ([]interface{}, error) {
+			return suite.QueryContract(
+				types.ERC20KavaWrappedNativeCoinContract.ABI,
+				caller,
+				privKey,
+				addr,
+				method,
+				args...,
+			)
+		}
+
+		// owner must be the evmutil module account
+		data, err := callContract("owner")
+		suite.NoError(err)
+		suite.Len(data, 1)
+		suite.Equal(types.ModuleEVMAddress, data[0].(common.Address))
+
+		// get name
+		data, err = callContract("name")
+		suite.NoError(err)
+		suite.Len(data, 1)
+		suite.Equal(token.Name, data[0].(string))
+
+		// get symbol
+		data, err = callContract("symbol")
+		suite.NoError(err)
+		suite.Len(data, 1)
+		suite.Equal(token.Symbol, data[0].(string))
+
+		// get decimals
+		data, err = callContract("decimals")
+		suite.NoError(err)
+		suite.Len(data, 1)
+		suite.Equal(token.Decimals, uint32(data[0].(uint8)))
+
+		// should not be able to call mint
+		_, err = callContract("mint", caller, big.NewInt(1))
+		suite.ErrorContains(err, "Ownable: caller is not the owner")
+
+		// should not be able to call burn
+		_, err = callContract("burn", caller, big.NewInt(1))
+		suite.ErrorContains(err, "Ownable: caller is not the owner")
+	})
+}

x/evmutil/testutil/suite.go

@@ -72,12 +72,10 @@ func (suite *Suite) SetupTest() {
 	suite.EvmModuleAddr = suite.AccountKeeper.GetModuleAddress(evmtypes.ModuleName)
 
 	// test evm user keys that have no minting permissions
-	key1, err := ethsecp256k1.GenerateKey()
-	suite.Require().NoError(err)
-	suite.Key1 = key1
-	suite.Key1Addr = types.NewInternalEVMAddress(common.BytesToAddress(suite.Key1.PubKey().Address()))
-	suite.Key2, err = ethsecp256k1.GenerateKey()
-	suite.Require().NoError(err)
+	addr, privKey := suite.RandomAccount()
+	suite.Key1 = privKey
+	suite.Key1Addr = types.NewInternalEVMAddress(addr)
+	_, suite.Key2 = suite.RandomAccount()
 
 	_, addrs := app.GeneratePrivKeyAddressPairs(4)
 	suite.Addrs = addrs
@@ -182,6 +180,13 @@ func (suite *Suite) Commit() {
 	suite.Ctx = suite.App.NewContext(false, header)
 }
 
+func (suite *Suite) RandomAccount() (common.Address, *ethsecp256k1.PrivKey) {
+	privKey, err := ethsecp256k1.GenerateKey()
+	suite.NoError(err)
+	addr := common.BytesToAddress(privKey.PubKey().Address())
+	return addr, privKey
+}
+
 func (suite *Suite) FundAccountWithKava(addr sdk.AccAddress, coins sdk.Coins) {
 	ukava := coins.AmountOf("ukava")
 	if ukava.IsPositive() {

x/evmutil/types/contract.go

@@ -18,6 +18,7 @@ import (
 	// Embed ERC20 JSON files
 	_ "embed"
 	"encoding/json"
+	"fmt"
 
 	"github.com/ethereum/go-ethereum/common"
 	evmtypes "github.com/evmos/ethermint/x/evm/types"
@@ -32,6 +33,12 @@ var (
 
 	// ERC20MintableBurnableAddress is the erc20 module address
 	ERC20MintableBurnableAddress common.Address
+
+	//go:embed ethermint_json/ERC20KavaWrappedNativeCoin.json
+	ERC20KavaWrappedNativeCoinJSON []byte
+
+	// ERC20KavaWrappedNativeCoinContract is the compiled erc20 contract
+	ERC20KavaWrappedNativeCoinContract evmtypes.CompiledContract
 )
 
 func init() {
@@ -39,10 +46,19 @@ func init() {
 
 	err := json.Unmarshal(ERC20MintableBurnableJSON, &ERC20MintableBurnableContract)
 	if err != nil {
-		panic(err)
+		panic(fmt.Sprintf("failed to unmarshal ERC20MintableBurnableJSON: %s. %s", err, string(ERC20MintableBurnableJSON)))
 	}
 
 	if len(ERC20MintableBurnableContract.Bin) == 0 {
-		panic("load contract failed")
+		panic("loading ERC20MintableBurnable contract failed")
+	}
+
+	err = json.Unmarshal(ERC20KavaWrappedNativeCoinJSON, &ERC20KavaWrappedNativeCoinContract)
+	if err != nil {
+		panic(fmt.Sprintf("failed to unmarshal ERC20KavaWrappedNativeCoinJSON: %s. %s", err, string(ERC20KavaWrappedNativeCoinJSON)))
+	}
+
+	if len(ERC20KavaWrappedNativeCoinContract.Bin) == 0 {
+		panic("loading ERC20KavaWrappedNativeCoin contract failed")
 	}
 }