forked from cerc-io/laconicd-deprecated
82 lines
3.1 KiB
Go
82 lines
3.1 KiB
Go
// Copyright 2021 Evmos Foundation
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// This file is part of Evmos' Ethermint library.
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//
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// The Ethermint library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The Ethermint library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
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package ante
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import (
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"math/big"
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errorsmod "cosmossdk.io/errors"
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evmtypes "github.com/cerc-io/laconicd/x/evm/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
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errortypes "github.com/cosmos/cosmos-sdk/types/errors"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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)
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// EthSigVerificationDecorator validates an ethereum signatures
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type EthSigVerificationDecorator struct {
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evmKeeper EVMKeeper
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}
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// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
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func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator {
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return EthSigVerificationDecorator{
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evmKeeper: ek,
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}
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}
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// AnteHandle validates checks that the registered chain id is the same as the one on the message, and
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// that the signer address matches the one defined on the message.
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// It's not skipped for RecheckTx, because it set `From` address which is critical from other ante handler to work.
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// Failure in RecheckTx will prevent tx to be included into block, especially when CheckTx succeed, in which case user
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// won't see the error message.
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func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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chainID := esvd.evmKeeper.ChainID()
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evmParams := esvd.evmKeeper.GetParams(ctx)
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chainCfg := evmParams.GetChainConfig()
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ethCfg := chainCfg.EthereumConfig(chainID)
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blockNum := big.NewInt(ctx.BlockHeight())
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signer := ethtypes.MakeSigner(ethCfg, blockNum)
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for _, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, errorsmod.Wrapf(errortypes.ErrUnknownRequest, "invalid message type %T, expected %T", msg, (*evmtypes.MsgEthereumTx)(nil))
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}
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allowUnprotectedTxs := evmParams.GetAllowUnprotectedTxs()
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ethTx := msgEthTx.AsTransaction()
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if !allowUnprotectedTxs && !ethTx.Protected() {
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return ctx, errorsmod.Wrapf(
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errortypes.ErrNotSupported,
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"rejected unprotected Ethereum transaction. Please EIP155 sign your transaction to protect it against replay-attacks")
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}
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sender, err := signer.Sender(ethTx)
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if err != nil {
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return ctx, errorsmod.Wrapf(
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errortypes.ErrorInvalidSigner,
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"couldn't retrieve sender address from the ethereum transaction: %s",
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err.Error(),
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)
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}
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// set up the sender to the transaction field if not already
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msgEthTx.From = sender.Hex()
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}
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return next(ctx, tx, simulate)
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}
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