package ante import ( "runtime/debug" "github.com/palantir/stacktrace" log "github.com/xlab/suplog" sdk "github.com/cosmos/cosmos-sdk/types" sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" "github.com/cosmos/cosmos-sdk/types/tx/signing" authante "github.com/cosmos/cosmos-sdk/x/auth/ante" authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing" authtypes "github.com/cosmos/cosmos-sdk/x/auth/types" channelkeeper "github.com/cosmos/ibc-go/modules/core/04-channel/keeper" ibcante "github.com/cosmos/ibc-go/modules/core/ante" "github.com/tharsis/ethermint/crypto/ethsecp256k1" ) const ( secp256k1VerifyCost uint64 = 21000 ) // AccountKeeper defines an expected keeper interface for the auth module's AccountKeeper type AccountKeeper interface { authante.AccountKeeper NewAccountWithAddress(ctx sdk.Context, addr sdk.AccAddress) authtypes.AccountI GetSequence(sdk.Context, sdk.AccAddress) (uint64, error) } // BankKeeper defines an expected keeper interface for the bank module's Keeper type BankKeeper interface { authtypes.BankKeeper GetBalance(ctx sdk.Context, addr sdk.AccAddress, denom string) sdk.Coin } // NewAnteHandler returns an ante handler responsible for attempting to route an // Ethereum or SDK transaction to an internal ante handler for performing // transaction-level processing (e.g. fee payment, signature verification) before // being passed onto it's respective handler. func NewAnteHandler( ak AccountKeeper, bankKeeper BankKeeper, evmKeeper EVMKeeper, feeGrantKeeper authante.FeegrantKeeper, channelKeeper channelkeeper.Keeper, signModeHandler authsigning.SignModeHandler, ) sdk.AnteHandler { return func( ctx sdk.Context, tx sdk.Tx, sim bool, ) (newCtx sdk.Context, err error) { var anteHandler sdk.AnteHandler defer Recover(&err) txWithExtensions, ok := tx.(authante.HasExtensionOptionsTx) if ok { opts := txWithExtensions.GetExtensionOptions() if len(opts) > 0 { switch typeURL := opts[0].GetTypeUrl(); typeURL { case "/ethermint.evm.v1alpha1.ExtensionOptionsEthereumTx": // handle as *evmtypes.MsgEthereumTx anteHandler = sdk.ChainAnteDecorators( NewEthSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first authante.NewMempoolFeeDecorator(), authante.NewTxTimeoutHeightDecorator(), authante.NewValidateMemoDecorator(ak), NewEthValidateBasicDecorator(), NewEthSigVerificationDecorator(evmKeeper), NewEthAccountVerificationDecorator(ak, bankKeeper, evmKeeper), NewEthNonceVerificationDecorator(ak), NewEthGasConsumeDecorator(ak, bankKeeper, evmKeeper), NewCanTransferDecorator(evmKeeper), NewEthIncrementSenderSequenceDecorator(ak), // innermost AnteDecorator. ) default: return ctx, stacktrace.Propagate( sdkerrors.Wrap(sdkerrors.ErrUnknownExtensionOptions, typeURL), "rejecting tx with unsupported extension option", ) } return anteHandler(ctx, tx, sim) } } // handle as totally normal Cosmos SDK tx switch tx.(type) { case sdk.Tx: anteHandler = sdk.ChainAnteDecorators( authante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first authante.NewRejectExtensionOptionsDecorator(), authante.NewMempoolFeeDecorator(), authante.NewValidateBasicDecorator(), authante.NewTxTimeoutHeightDecorator(), authante.NewValidateMemoDecorator(ak), ibcante.NewAnteDecorator(channelKeeper), authante.NewConsumeGasForTxSizeDecorator(ak), authante.NewSetPubKeyDecorator(ak), // SetPubKeyDecorator must be called before all signature verification decorators authante.NewValidateSigCountDecorator(ak), authante.NewDeductFeeDecorator(ak, bankKeeper, feeGrantKeeper), authante.NewSigGasConsumeDecorator(ak, DefaultSigVerificationGasConsumer), authante.NewSigVerificationDecorator(ak, signModeHandler), authante.NewIncrementSequenceDecorator(ak), // innermost AnteDecorator ) default: return ctx, stacktrace.Propagate( sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx), "transaction is not an SDK tx", ) } return anteHandler(ctx, tx, sim) } } func Recover(err *error) { if r := recover(); r != nil { *err = sdkerrors.Wrapf(sdkerrors.ErrPanic, "%v", r) if e, ok := r.(error); ok { log.WithError(e).Errorln("ante handler panicked with an error") log.Debugln(string(debug.Stack())) } else { log.Errorln(r) } } } var _ authante.SignatureVerificationGasConsumer = DefaultSigVerificationGasConsumer // DefaultSigVerificationGasConsumer is the default implementation of SignatureVerificationGasConsumer. It consumes gas // for signature verification based upon the public key type. The cost is fetched from the given params and is matched // by the concrete type. func DefaultSigVerificationGasConsumer( meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params, ) error { // support for ethereum ECDSA secp256k1 keys _, ok := sig.PubKey.(*ethsecp256k1.PubKey) if ok { meter.ConsumeGas(secp256k1VerifyCost, "ante verify: eth_secp256k1") return nil } return authante.DefaultSigVerificationGasConsumer(meter, sig, params) }