package ante import ( "fmt" "runtime/debug" errorsmod "cosmossdk.io/errors" sdk "github.com/cosmos/cosmos-sdk/types" sdkerrors "github.com/cosmos/cosmos-sdk/types/errors" authante "github.com/cosmos/cosmos-sdk/x/auth/ante" authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing" vesting "github.com/cosmos/cosmos-sdk/x/auth/vesting/types" ibcante "github.com/cosmos/ibc-go/v6/modules/core/ante" ibckeeper "github.com/cosmos/ibc-go/v6/modules/core/keeper" evmante "github.com/evmos/ethermint/app/ante" evmtypes "github.com/evmos/ethermint/x/evm/types" tmlog "github.com/tendermint/tendermint/libs/log" ) // HandlerOptions extend the SDK's AnteHandler options by requiring the IBC // channel keeper, EVM Keeper and Fee Market Keeper. type HandlerOptions struct { AccountKeeper evmtypes.AccountKeeper BankKeeper evmtypes.BankKeeper IBCKeeper *ibckeeper.Keeper EvmKeeper evmante.EVMKeeper FeegrantKeeper authante.FeegrantKeeper SignModeHandler authsigning.SignModeHandler SigGasConsumer authante.SignatureVerificationGasConsumer FeeMarketKeeper evmtypes.FeeMarketKeeper MaxTxGasWanted uint64 AddressFetchers []AddressFetcher ExtensionOptionChecker authante.ExtensionOptionChecker TxFeeChecker authante.TxFeeChecker } func (options HandlerOptions) Validate() error { if options.AccountKeeper == nil { return errorsmod.Wrap(sdkerrors.ErrLogic, "account keeper is required for AnteHandler") } if options.BankKeeper == nil { return errorsmod.Wrap(sdkerrors.ErrLogic, "bank keeper is required for AnteHandler") } if options.SignModeHandler == nil { return errorsmod.Wrap(sdkerrors.ErrLogic, "sign mode handler is required for ante builder") } if options.EvmKeeper == nil { return errorsmod.Wrap(sdkerrors.ErrLogic, "evm keeper is required for AnteHandler") } return nil } // cosmosHandlerOptions extends HandlerOptions to provide some Cosmos specific configurations type cosmosHandlerOptions struct { HandlerOptions isEIP712 bool } // NewAnteHandler returns an 'AnteHandler' that will run actions before a tx is sent to a module's handler. func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) { if err := options.Validate(); err != nil { return nil, err } return func( ctx sdk.Context, tx sdk.Tx, sim bool, ) (newCtx sdk.Context, err error) { var anteHandler sdk.AnteHandler defer Recover(ctx.Logger(), &err) txWithExtensions, ok := tx.(authante.HasExtensionOptionsTx) if ok { opts := txWithExtensions.GetExtensionOptions() if len(opts) > 1 { return ctx, errorsmod.Wrap( sdkerrors.ErrInvalidRequest, "rejecting tx with more than 1 extension option", ) } if len(opts) == 1 { switch typeURL := opts[0].GetTypeUrl(); typeURL { case "/ethermint.evm.v1.ExtensionOptionsEthereumTx": // handle as *evmtypes.MsgEthereumTx anteHandler = newEthAnteHandler(options) case "/ethermint.types.v1.ExtensionOptionsWeb3Tx": // handle as normal Cosmos SDK tx, except signature is checked for EIP712 representation anteHandler = newCosmosAnteHandler(cosmosHandlerOptions{ HandlerOptions: options, isEIP712: true, }) default: return ctx, errorsmod.Wrapf( sdkerrors.ErrUnknownExtensionOptions, "rejecting tx with unsupported extension option: %s", typeURL, ) } return anteHandler(ctx, tx, sim) } } // handle as totally normal Cosmos SDK tx switch tx.(type) { case sdk.Tx: anteHandler = newCosmosAnteHandler(cosmosHandlerOptions{ HandlerOptions: options, isEIP712: false, }) default: return ctx, errorsmod.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx) } return anteHandler(ctx, tx, sim) }, nil } func newCosmosAnteHandler(options cosmosHandlerOptions) sdk.AnteHandler { decorators := []sdk.AnteDecorator{} decorators = append(decorators, evmante.RejectMessagesDecorator{}, // reject MsgEthereumTxs authante.NewSetUpContextDecorator(), // second decorator. SetUpContext must be called before other decorators ) if !options.isEIP712 { decorators = append(decorators, authante.NewExtensionOptionsDecorator(options.ExtensionOptionChecker)) } if len(options.AddressFetchers) > 0 { decorators = append(decorators, NewAuthenticatedMempoolDecorator(options.AddressFetchers...)) } var sigVerification sdk.AnteDecorator = authante.NewSigVerificationDecorator(options.AccountKeeper, options.SignModeHandler) if options.isEIP712 { sigVerification = evmante.NewLegacyEip712SigVerificationDecorator(options.AccountKeeper, options.SignModeHandler, options.EvmKeeper) } decorators = append(decorators, NewEvmMinGasFilter(options.EvmKeeper), // filter out evm denom from min-gas-prices NewVestingAccountDecorator(), NewAuthzLimiterDecorator( sdk.MsgTypeURL(&evmtypes.MsgEthereumTx{}), sdk.MsgTypeURL(&vesting.MsgCreateVestingAccount{}), ), authante.NewValidateBasicDecorator(), authante.NewTxTimeoutHeightDecorator(), // If ethermint x/feemarket is enabled, align Cosmos min fee with the EVM // evmante.NewMinGasPriceDecorator(options.FeeMarketKeeper, options.EvmKeeper), authante.NewValidateMemoDecorator(options.AccountKeeper), authante.NewConsumeGasForTxSizeDecorator(options.AccountKeeper), authante.NewDeductFeeDecorator(options.AccountKeeper, options.BankKeeper, options.FeegrantKeeper, options.TxFeeChecker), authante.NewSetPubKeyDecorator(options.AccountKeeper), // SetPubKeyDecorator must be called before all signature verification decorators authante.NewValidateSigCountDecorator(options.AccountKeeper), authante.NewSigGasConsumeDecorator(options.AccountKeeper, options.SigGasConsumer), sigVerification, authante.NewIncrementSequenceDecorator(options.AccountKeeper), // innermost AnteDecorator ibcante.NewRedundantRelayDecorator(options.IBCKeeper), ) return sdk.ChainAnteDecorators(decorators...) } func newEthAnteHandler(options HandlerOptions) sdk.AnteHandler { return sdk.ChainAnteDecorators( evmante.NewEthSetUpContextDecorator(options.EvmKeeper), // outermost AnteDecorator. SetUpContext must be called first evmante.NewEthMempoolFeeDecorator(options.EvmKeeper), // Check eth effective gas price against minimal-gas-prices evmante.NewEthValidateBasicDecorator(options.EvmKeeper), evmante.NewEthSigVerificationDecorator(options.EvmKeeper), evmante.NewEthAccountVerificationDecorator(options.AccountKeeper, options.EvmKeeper), evmante.NewCanTransferDecorator(options.EvmKeeper), evmante.NewEthGasConsumeDecorator(options.EvmKeeper, options.MaxTxGasWanted), evmante.NewEthIncrementSenderSequenceDecorator(options.AccountKeeper), // innermost AnteDecorator. evmante.NewEthEmitEventDecorator(options.EvmKeeper), // emit eth tx hash and index at the very last ante handler. ) } func Recover(logger tmlog.Logger, err *error) { if r := recover(); r != nil { *err = errorsmod.Wrapf(sdkerrors.ErrPanic, "%v", r) if e, ok := r.(error); ok { logger.Error( "ante handler panicked", "error", e, "stack trace", string(debug.Stack()), ) } else { logger.Error( "ante handler panicked", "recover", fmt.Sprintf("%v", r), ) } } }