accounts, signer: implement gnosis safe support (#21593)

* accounts, signer: implement gnosis safe support * common/math: add type for marshalling big to dec * accounts, signer: properly sign gnosis requests * signer, clef: implement account_signGnosisTx * signer: fix auditlog print, change rpc-name (signGnosisTx to signGnosisSafeTx) * signer: pass validation-messages/warnings to the UI for gnonsis-safe txs * signer/core: minor change to validationmessages of typed data
2020-09-29 17:40:08 +02:00
parent 6c8310ebb4
commit dad26582b6
8 changed files with 395 additions and 15 deletions
--- a/signer/core/gnosis_safe.go
+++ b/signer/core/gnosis_safe.go
@ -0,0 +1,91 @@
+package core
+
+import (
+	"fmt"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/common/math"
+)
+
+// GnosisSafeTx is a type to parse the safe-tx returned by the relayer,
+// it also conforms to the API required by the Gnosis Safe tx relay service.
+// See 'SafeMultisigTransaction' on https://safe-transaction.mainnet.gnosis.io/
+type GnosisSafeTx struct {
+	// These fields are only used on output
+	Signature  hexutil.Bytes           `json:"signature"`
+	SafeTxHash common.Hash             `json:"contractTransactionHash"`
+	Sender     common.MixedcaseAddress `json:"sender"`
+	// These fields are used both on input and output
+	Safe           common.MixedcaseAddress `json:"safe"`
+	To             common.MixedcaseAddress `json:"to"`
+	Value          math.Decimal256         `json:"value"`
+	GasPrice       math.Decimal256         `json:"gasPrice"`
+	Data           *hexutil.Bytes          `json:"data"`
+	Operation      uint8                   `json:"operation"`
+	GasToken       common.Address          `json:"gasToken"`
+	RefundReceiver common.Address          `json:"refundReceiver"`
+	BaseGas        big.Int                 `json:"baseGas"`
+	SafeTxGas      big.Int                 `json:"safeTxGas"`
+	Nonce          big.Int                 `json:"nonce"`
+	InputExpHash   common.Hash             `json:"safeTxHash"`
+}
+
+// ToTypedData converts the tx to a EIP-712 Typed Data structure for signing
+func (tx *GnosisSafeTx) ToTypedData() TypedData {
+	var data hexutil.Bytes
+	if tx.Data != nil {
+		data = *tx.Data
+	}
+	gnosisTypedData := TypedData{
+		Types: Types{
+			"EIP712Domain": []Type{{Name: "verifyingContract", Type: "address"}},
+			"SafeTx": []Type{
+				{Name: "to", Type: "address"},
+				{Name: "value", Type: "uint256"},
+				{Name: "data", Type: "bytes"},
+				{Name: "operation", Type: "uint8"},
+				{Name: "safeTxGas", Type: "uint256"},
+				{Name: "baseGas", Type: "uint256"},
+				{Name: "gasPrice", Type: "uint256"},
+				{Name: "gasToken", Type: "address"},
+				{Name: "refundReceiver", Type: "address"},
+				{Name: "nonce", Type: "uint256"},
+			},
+		},
+		Domain: TypedDataDomain{
+			VerifyingContract: tx.Safe.Address().Hex(),
+		},
+		PrimaryType: "SafeTx",
+		Message: TypedDataMessage{
+			"to":             tx.To.Address().Hex(),
+			"value":          tx.Value.String(),
+			"data":           data,
+			"operation":      fmt.Sprintf("%d", tx.Operation),
+			"safeTxGas":      fmt.Sprintf("%#d", &tx.SafeTxGas),
+			"baseGas":        fmt.Sprintf("%#d", &tx.BaseGas),
+			"gasPrice":       tx.GasPrice.String(),
+			"gasToken":       tx.GasToken.Hex(),
+			"refundReceiver": tx.RefundReceiver.Hex(),
+			"nonce":          fmt.Sprintf("%d", tx.Nonce.Uint64()),
+		},
+	}
+	return gnosisTypedData
+}
+
+// ArgsForValidation returns a SendTxArgs struct, which can be used for the
+// common validations, e.g. look up 4byte destinations
+func (tx *GnosisSafeTx) ArgsForValidation() *SendTxArgs {
+	args := &SendTxArgs{
+		From:     tx.Safe,
+		To:       &tx.To,
+		Gas:      hexutil.Uint64(tx.SafeTxGas.Uint64()),
+		GasPrice: hexutil.Big(tx.GasPrice),
+		Value:    hexutil.Big(tx.Value),
+		Nonce:    hexutil.Uint64(tx.Nonce.Uint64()),
+		Data:     tx.Data,
+		Input:    nil,
+	}
+	return args
+}