248 lines
7.6 KiB
Go
248 lines
7.6 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package external
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import (
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"fmt"
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"math/big"
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"sync"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/signer/core"
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)
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type ExternalBackend struct {
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signers []accounts.Wallet
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}
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func (eb *ExternalBackend) Wallets() []accounts.Wallet {
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return eb.signers
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}
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func NewExternalBackend(endpoint string) (*ExternalBackend, error) {
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signer, err := NewExternalSigner(endpoint)
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if err != nil {
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return nil, err
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}
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return &ExternalBackend{
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signers: []accounts.Wallet{signer},
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}, nil
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}
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func (eb *ExternalBackend) Subscribe(sink chan<- accounts.WalletEvent) event.Subscription {
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return event.NewSubscription(func(quit <-chan struct{}) error {
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<-quit
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return nil
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})
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}
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// ExternalSigner provides an API to interact with an external signer (clef)
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// It proxies request to the external signer while forwarding relevant
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// request headers
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type ExternalSigner struct {
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client *rpc.Client
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endpoint string
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status string
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cacheMu sync.RWMutex
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cache []accounts.Account
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}
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func NewExternalSigner(endpoint string) (*ExternalSigner, error) {
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client, err := rpc.Dial(endpoint)
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if err != nil {
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return nil, err
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}
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extsigner := &ExternalSigner{
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client: client,
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endpoint: endpoint,
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}
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// Check if reachable
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version, err := extsigner.pingVersion()
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if err != nil {
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return nil, err
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}
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extsigner.status = fmt.Sprintf("ok [version=%v]", version)
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return extsigner, nil
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}
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func (api *ExternalSigner) URL() accounts.URL {
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return accounts.URL{
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Scheme: "extapi",
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Path: api.endpoint,
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}
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}
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func (api *ExternalSigner) Status() (string, error) {
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return api.status, nil
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}
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func (api *ExternalSigner) Open(passphrase string) error {
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return fmt.Errorf("operation not supported on external signers")
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}
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func (api *ExternalSigner) Close() error {
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return fmt.Errorf("operation not supported on external signers")
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}
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func (api *ExternalSigner) Accounts() []accounts.Account {
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var accnts []accounts.Account
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res, err := api.listAccounts()
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if err != nil {
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log.Error("account listing failed", "error", err)
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return accnts
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}
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for _, addr := range res {
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accnts = append(accnts, accounts.Account{
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URL: accounts.URL{
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Scheme: "extapi",
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Path: api.endpoint,
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},
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Address: addr,
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})
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}
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api.cacheMu.Lock()
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api.cache = accnts
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api.cacheMu.Unlock()
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return accnts
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}
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func (api *ExternalSigner) Contains(account accounts.Account) bool {
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api.cacheMu.RLock()
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defer api.cacheMu.RUnlock()
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if api.cache == nil {
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// If we haven't already fetched the accounts, it's time to do so now
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api.cacheMu.RUnlock()
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api.Accounts()
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api.cacheMu.RLock()
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}
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for _, a := range api.cache {
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if a.Address == account.Address && (account.URL == (accounts.URL{}) || account.URL == api.URL()) {
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return true
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}
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}
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return false
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}
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func (api *ExternalSigner) Derive(path accounts.DerivationPath, pin bool) (accounts.Account, error) {
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return accounts.Account{}, fmt.Errorf("operation not supported on external signers")
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}
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func (api *ExternalSigner) SelfDerive(bases []accounts.DerivationPath, chain ethereum.ChainStateReader) {
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log.Error("operation SelfDerive not supported on external signers")
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}
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func (api *ExternalSigner) signHash(account accounts.Account, hash []byte) ([]byte, error) {
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return []byte{}, fmt.Errorf("operation not supported on external signers")
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}
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// SignData signs keccak256(data). The mimetype parameter describes the type of data being signed
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func (api *ExternalSigner) SignData(account accounts.Account, mimeType string, data []byte) ([]byte, error) {
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var res hexutil.Bytes
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var signAddress = common.NewMixedcaseAddress(account.Address)
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if err := api.client.Call(&res, "account_signData",
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mimeType,
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&signAddress, // Need to use the pointer here, because of how MarshalJSON is defined
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hexutil.Encode(data)); err != nil {
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return nil, err
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}
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// If V is on 27/28-form, convert to 0/1 for Clique
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if mimeType == accounts.MimetypeClique && (res[64] == 27 || res[64] == 28) {
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res[64] -= 27 // Transform V from 27/28 to 0/1 for Clique use
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}
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return res, nil
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}
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func (api *ExternalSigner) SignText(account accounts.Account, text []byte) ([]byte, error) {
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var signature hexutil.Bytes
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var signAddress = common.NewMixedcaseAddress(account.Address)
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if err := api.client.Call(&signature, "account_signData",
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accounts.MimetypeTextPlain,
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&signAddress, // Need to use the pointer here, because of how MarshalJSON is defined
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hexutil.Encode(text)); err != nil {
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return nil, err
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}
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if signature[64] == 27 || signature[64] == 28 {
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// If clef is used as a backend, it may already have transformed
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// the signature to ethereum-type signature.
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signature[64] -= 27 // Transform V from Ethereum-legacy to 0/1
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}
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return signature, nil
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}
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// signTransactionResult represents the signinig result returned by clef.
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type signTransactionResult struct {
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Raw hexutil.Bytes `json:"raw"`
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Tx *types.Transaction `json:"tx"`
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}
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func (api *ExternalSigner) SignTx(account accounts.Account, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
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data := hexutil.Bytes(tx.Data())
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var to *common.MixedcaseAddress
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if tx.To() != nil {
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t := common.NewMixedcaseAddress(*tx.To())
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to = &t
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}
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args := &core.SendTxArgs{
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Data: &data,
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Nonce: hexutil.Uint64(tx.Nonce()),
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Value: hexutil.Big(*tx.Value()),
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Gas: hexutil.Uint64(tx.Gas()),
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GasPrice: hexutil.Big(*tx.GasPrice()),
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To: to,
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From: common.NewMixedcaseAddress(account.Address),
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}
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var res signTransactionResult
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if err := api.client.Call(&res, "account_signTransaction", args); err != nil {
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return nil, err
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}
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return res.Tx, nil
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}
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func (api *ExternalSigner) SignTextWithPassphrase(account accounts.Account, passphrase string, text []byte) ([]byte, error) {
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return []byte{}, fmt.Errorf("password-operations not supported on external signers")
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}
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func (api *ExternalSigner) SignTxWithPassphrase(account accounts.Account, passphrase string, tx *types.Transaction, chainID *big.Int) (*types.Transaction, error) {
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return nil, fmt.Errorf("password-operations not supported on external signers")
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}
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func (api *ExternalSigner) SignDataWithPassphrase(account accounts.Account, passphrase, mimeType string, data []byte) ([]byte, error) {
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return nil, fmt.Errorf("password-operations not supported on external signers")
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}
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func (api *ExternalSigner) listAccounts() ([]common.Address, error) {
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var res []common.Address
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if err := api.client.Call(&res, "account_list"); err != nil {
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return nil, err
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}
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return res, nil
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}
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func (api *ExternalSigner) pingVersion() (string, error) {
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var v string
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if err := api.client.Call(&v, "account_version"); err != nil {
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return "", err
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}
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return v, nil
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}
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