package ante import ( "fmt" "runtime/debug" tmlog "github.com/tendermint/tendermint/libs/log" 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" authtypes "github.com/cosmos/cosmos-sdk/x/auth/types" "github.com/tharsis/ethermint/crypto/ethsecp256k1" ) const ( secp256k1VerifyCost uint64 = 21000 ) // 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(options HandlerOptions) sdk.AnteHandler { 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) > 0 { 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 = newCosmosAnteHandlerEip712(options) default: return ctx, sdkerrors.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(options) default: return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx) } return anteHandler(ctx, tx, sim) } } func Recover(logger tmlog.Logger, err *error) { if r := recover(); r != nil { *err = sdkerrors.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), ) } } } 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) }