ante.go

package app

import (
	sdk "github.com/cosmos/cosmos-sdk/types"
	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
	"github.com/cosmos/cosmos-sdk/x/auth/ante"
	ibcante "github.com/cosmos/ibc-go/v3/modules/core/ante"
	ibckeeper "github.com/cosmos/ibc-go/v3/modules/core/keeper"
	consumerante "github.com/cosmos/interchain-security/app/consumer/ante"
	ibcconsumerkeeper "github.com/cosmos/interchain-security/x/ccv/consumer/keeper"
)

type HandlerOptions struct {
	ante.HandlerOptions
	IBCKeeper      *ibckeeper.Keeper
	ConsumerKeeper ibcconsumerkeeper.Keeper
}

// NewAnteHandler returns an AnteHandler that checks and increments sequence
// numbers, checks signatures & account numbers, and deducts fees from the first
// signer
func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) {
	if options.AccountKeeper == nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "account keeper is required for AnteHandler")
	}
	if options.BankKeeper == nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "bank keeper is required for AnteHandler")
	}
	if options.SignModeHandler == nil {
		return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "sign mode handler is required for ante builder")
	}
	sigGasConsumer := options.SigGasConsumer
	if sigGasConsumer == nil {
		sigGasConsumer = ante.DefaultSigVerificationGasConsumer
	}

	anteDecorators := []sdk.AnteDecorator{
		ante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
		ante.NewRejectExtensionOptionsDecorator(),
		// temporarily disabled so that chain can be tested locally without the provider chain running
		//consumerante.NewMsgFilterDecorator(options.ConsumerKeeper),
		consumerante.NewDisabledModulesDecorator("/cosmos.evidence", "/cosmos.slashing"),
		ante.NewMempoolFeeDecorator(),
		ante.NewValidateBasicDecorator(),
		ante.NewTxTimeoutHeightDecorator(),
		ante.NewValidateMemoDecorator(options.AccountKeeper),
		ante.NewConsumeGasForTxSizeDecorator(options.AccountKeeper),
		ante.NewDeductFeeDecorator(options.AccountKeeper, options.BankKeeper, options.FeegrantKeeper),
		ante.NewSetPubKeyDecorator(options.AccountKeeper), // SetPubKeyDecorator must be called before all signature verification decorators
		ante.NewValidateSigCountDecorator(options.AccountKeeper),
		ante.NewSigGasConsumeDecorator(options.AccountKeeper, sigGasConsumer),
		ante.NewSigVerificationDecorator(options.AccountKeeper, options.SignModeHandler),
		ante.NewIncrementSequenceDecorator(options.AccountKeeper),
		ibcante.NewAnteDecorator(options.IBCKeeper),
	}
	return sdk.ChainAnteDecorators(anteDecorators...), nil

}