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eip712.go
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eip712.go
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// Copyright 2022 Match Foundation
// This file is part of the Match Network packages.
//
// Match is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The Match packages are distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the Match packages. If not, see https://github.com/matchain/match/blob/main/LICENSE
package tx
import (
"errors"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/codec"
codectypes "github.com/cosmos/cosmos-sdk/codec/types"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/tx/signing"
"github.com/cosmos/cosmos-sdk/x/auth/migrations/legacytx"
authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/signer/core/apitypes"
cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
"github.com/matchain/match/app"
cryptocodec "github.com/matchain/match/crypto/codec"
"github.com/matchain/match/ethereum/eip712"
"github.com/matchain/match/types"
)
type EIP712TxArgs struct {
CosmosTxArgs CosmosTxArgs
UseLegacyExtension bool
UseLegacyTypedData bool
}
type typedDataArgs struct {
chainID uint64
data []byte
legacyFeePayer sdk.AccAddress
legacyMsg sdk.Msg
}
type signatureV2Args struct {
pubKey cryptotypes.PubKey
signature []byte
nonce uint64
}
type legacyWeb3ExtensionArgs struct {
feePayer string
chainID uint64
signature []byte
}
// CreateEIP712CosmosTx creates a cosmos tx for typed data according to EIP712.
// Also, signs the tx with the provided messages and private key.
// It returns the signed transaction and an error
func CreateEIP712CosmosTx(
ctx sdk.Context,
appMatch *app.Match,
args EIP712TxArgs,
) (sdk.Tx, error) {
builder, err := PrepareEIP712CosmosTx(
ctx,
appMatch,
args,
)
return builder.GetTx(), err
}
// PrepareEIP712CosmosTx creates a cosmos tx for typed data according to EIP712.
// Also, signs the tx with the provided messages and private key.
// It returns the tx builder with the signed transaction and an error
func PrepareEIP712CosmosTx(
ctx sdk.Context,
appMatch *app.Match,
args EIP712TxArgs,
) (client.TxBuilder, error) {
txArgs := args.CosmosTxArgs
pc, err := types.ParseChainID(txArgs.ChainID)
if err != nil {
return nil, err
}
chainIDNum := pc.Uint64()
from := sdk.AccAddress(txArgs.Priv.PubKey().Address().Bytes())
accNumber := appMatch.AccountKeeper.GetAccount(ctx, from).GetAccountNumber()
nonce, err := appMatch.AccountKeeper.GetSequence(ctx, from)
if err != nil {
return nil, err
}
fee := legacytx.NewStdFee(txArgs.Gas, txArgs.Fees) //nolint: staticcheck
msgs := txArgs.Msgs
data := legacytx.StdSignBytes(ctx.ChainID(), accNumber, nonce, 0, fee, msgs, "", nil)
typedDataArgs := typedDataArgs{
chainID: chainIDNum,
data: data,
legacyFeePayer: from,
legacyMsg: msgs[0],
}
typedData, err := createTypedData(typedDataArgs, args.UseLegacyTypedData)
if err != nil {
return nil, err
}
txBuilder := txArgs.TxCfg.NewTxBuilder()
builder, ok := txBuilder.(authtx.ExtensionOptionsTxBuilder)
if !ok {
return nil, errors.New("txBuilder could not be casted to authtx.ExtensionOptionsTxBuilder type")
}
builder.SetFeeAmount(fee.Amount)
builder.SetGasLimit(txArgs.Gas)
err = builder.SetMsgs(txArgs.Msgs...)
if err != nil {
return nil, err
}
return signCosmosEIP712Tx(
ctx,
appMatch,
args,
builder,
chainIDNum,
typedData,
)
}
// signCosmosEIP712Tx signs the cosmos transaction on the txBuilder provided using
// the provided private key and the typed data
func signCosmosEIP712Tx(
ctx sdk.Context,
appMatch *app.Match,
args EIP712TxArgs,
builder authtx.ExtensionOptionsTxBuilder,
chainID uint64,
data apitypes.TypedData,
) (client.TxBuilder, error) {
priv := args.CosmosTxArgs.Priv
from := sdk.AccAddress(priv.PubKey().Address().Bytes())
nonce, err := appMatch.AccountKeeper.GetSequence(ctx, from)
if err != nil {
return nil, err
}
sigHash, _, err := apitypes.TypedDataAndHash(data)
if err != nil {
return nil, err
}
keyringSigner := NewSigner(priv)
signature, pubKey, err := keyringSigner.SignByAddress(from, sigHash)
if err != nil {
return nil, err
}
signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
if args.UseLegacyExtension {
if err := setBuilderLegacyWeb3Extension(
builder,
legacyWeb3ExtensionArgs{
feePayer: from.String(),
chainID: chainID,
signature: signature,
}); err != nil {
return nil, err
}
}
sigsV2 := getTxSignatureV2(
signatureV2Args{
pubKey: pubKey,
signature: signature,
nonce: nonce,
},
args.UseLegacyExtension,
)
err = builder.SetSignatures(sigsV2)
if err != nil {
return nil, err
}
return builder, nil
}
// createTypedData creates the TypedData object corresponding to
// the arguments, using the legacy implementation as specified.
func createTypedData(args typedDataArgs, useLegacy bool) (apitypes.TypedData, error) {
if useLegacy {
registry := codectypes.NewInterfaceRegistry()
types.RegisterInterfaces(registry)
cryptocodec.RegisterInterfaces(registry)
matchCodec := codec.NewProtoCodec(registry)
feeDelegation := &eip712.FeeDelegationOptions{
FeePayer: args.legacyFeePayer,
}
return eip712.LegacyWrapTxToTypedData(
matchCodec,
args.chainID,
args.legacyMsg,
args.data,
feeDelegation,
)
}
return eip712.WrapTxToTypedData(args.chainID, args.data)
}
// setBuilderLegacyWeb3Extension creates a legacy ExtensionOptionsWeb3Tx and
// appends it to the builder options.
func setBuilderLegacyWeb3Extension(builder authtx.ExtensionOptionsTxBuilder, args legacyWeb3ExtensionArgs) error {
option, err := codectypes.NewAnyWithValue(&types.ExtensionOptionsWeb3Tx{
FeePayer: args.feePayer,
TypedDataChainID: args.chainID,
FeePayerSig: args.signature,
})
if err != nil {
return err
}
builder.SetExtensionOptions(option)
return nil
}
// getTxSignatureV2 returns the SignatureV2 object corresponding to
// the arguments, using the legacy implementation as needed.
func getTxSignatureV2(args signatureV2Args, useLegacyExtension bool) signing.SignatureV2 {
if useLegacyExtension {
return signing.SignatureV2{
PubKey: args.pubKey,
Data: &signing.SingleSignatureData{
SignMode: signing.SignMode_SIGN_MODE_LEGACY_AMINO_JSON,
},
Sequence: args.nonce,
}
}
// Must use SIGN_MODE_DIRECT, since Amino has some trouble parsing certain Any values from a SignDoc
// with the Legacy EIP-712 TypedData encodings. This is not an issue with the latest encoding.
return signing.SignatureV2{
PubKey: args.pubKey,
Data: &signing.SingleSignatureData{
SignMode: signing.SignMode_SIGN_MODE_DIRECT,
Signature: args.signature,
},
Sequence: args.nonce,
}
}