laconicd/rpc/personal_api.go

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package rpc
import (
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"bytes"
"context"
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"fmt"
"log"
"os"
"sync"
"time"
sdkcontext "github.com/cosmos/cosmos-sdk/client/context"
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"github.com/cosmos/cosmos-sdk/client/flags"
"github.com/cosmos/cosmos-sdk/crypto/keys"
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sdk "github.com/cosmos/cosmos-sdk/types"
emintcrypto "github.com/cosmos/ethermint/crypto"
params "github.com/cosmos/ethermint/rpc/args"
"github.com/spf13/viper"
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"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/crypto"
)
// PersonalEthAPI is the eth_ prefixed set of APIs in the Web3 JSON-RPC spec.
type PersonalEthAPI struct {
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cliCtx sdkcontext.CLIContext
ethAPI *PublicEthAPI
nonceLock *AddrLocker
keys []emintcrypto.PrivKeySecp256k1
keyInfos []keys.Info
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keybaseLock sync.Mutex
}
// NewPersonalEthAPI creates an instance of the public ETH Web3 API.
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func NewPersonalEthAPI(cliCtx sdkcontext.CLIContext, ethAPI *PublicEthAPI, nonceLock *AddrLocker, keys []emintcrypto.PrivKeySecp256k1) *PersonalEthAPI {
api := &PersonalEthAPI{
cliCtx: cliCtx,
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ethAPI: ethAPI,
nonceLock: nonceLock,
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keys: keys,
}
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infos, err := api.getKeybaseInfo()
if err != nil {
return api
}
api.keyInfos = infos
return api
}
func (e *PersonalEthAPI) getKeybaseInfo() ([]keys.Info, error) {
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e.keybaseLock.Lock()
defer e.keybaseLock.Unlock()
if e.cliCtx.Keybase == nil {
keybase, err := keys.NewKeyring(
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sdk.KeyringServiceName(),
viper.GetString(flags.FlagKeyringBackend),
viper.GetString(flags.FlagHome),
e.cliCtx.Input,
emintcrypto.EthSecp256k1Options()...,
)
if err != nil {
return nil, err
}
e.cliCtx.Keybase = keybase
}
return e.cliCtx.Keybase.List()
}
// ImportRawKey stores the given hex encoded ECDSA key into the key directory,
// encrypting it with the passphrase.
// Currently, this is not implemented since the feature is not supported by the keys.
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func (e *PersonalEthAPI) ImportRawKey(privkey, password string) (common.Address, error) {
_, err := crypto.HexToECDSA(privkey)
if err != nil {
return common.Address{}, err
}
return common.Address{}, nil
}
// ListAccounts will return a list of addresses for accounts this node manages.
func (e *PersonalEthAPI) ListAccounts() ([]common.Address, error) {
addrs := []common.Address{}
for _, info := range e.keyInfos {
addressBytes := info.GetPubKey().Address().Bytes()
addrs = append(addrs, common.BytesToAddress(addressBytes))
}
return addrs, nil
}
// LockAccount will lock the account associated with the given address when it's unlocked.
// It removes the key corresponding to the given address from the API's local keys.
func (e *PersonalEthAPI) LockAccount(address common.Address) bool {
for i, key := range e.keys {
if !bytes.Equal(key.PubKey().Address().Bytes(), address.Bytes()) {
continue
}
tmp := make([]emintcrypto.PrivKeySecp256k1, len(e.keys)-1)
copy(tmp[:i], e.keys[:i])
copy(tmp[i:], e.keys[i+1:])
e.keys = tmp
return true
}
return false
}
// NewAccount will create a new account and returns the address for the new account.
func (e *PersonalEthAPI) NewAccount(password string) (common.Address, error) {
_, err := e.getKeybaseInfo()
if err != nil {
return common.Address{}, err
}
name := "key_" + time.Now().UTC().Format(time.RFC3339)
info, _, err := e.cliCtx.Keybase.CreateMnemonic(name, keys.English, password, emintcrypto.EthSecp256k1)
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if err != nil {
return common.Address{}, err
}
e.keyInfos = append(e.keyInfos, info)
addr := common.BytesToAddress(info.GetPubKey().Address().Bytes())
log.Printf("Your new key was generated\t\taddress=0x%x", addr)
log.Printf("Please backup your key file!\tpath=%s", os.Getenv("HOME")+"/.ethermintcli/"+name)
log.Println("Please remember your password!")
return addr, nil
}
// UnlockAccount will unlock the account associated with the given address with
// the given password for duration seconds. If duration is nil it will use a
// default of 300 seconds. It returns an indication if the account was unlocked.
// It exports the private key corresponding to the given address from the keyring and stores it in the API's local keys.
func (e *PersonalEthAPI) UnlockAccount(ctx context.Context, addr common.Address, password string, _ *uint64) (bool, error) {
// TODO: use duration
name := ""
for _, info := range e.keyInfos {
addressBytes := info.GetPubKey().Address().Bytes()
if bytes.Equal(addressBytes, addr[:]) {
name = info.GetName()
}
}
if name == "" {
return false, fmt.Errorf("cannot find key with given address")
}
// TODO: this only works on local keys
privKey, err := e.cliCtx.Keybase.ExportPrivateKeyObject(name, password)
if err != nil {
return false, err
}
emintKey, ok := privKey.(emintcrypto.PrivKeySecp256k1)
if !ok {
return false, fmt.Errorf("invalid private key type: %T", privKey)
}
e.keys = append(e.keys, emintKey)
return true, nil
}
// SendTransaction will create a transaction from the given arguments and
// tries to sign it with the key associated with args.To. If the given password isn't
// able to decrypt the key it fails.
func (e *PersonalEthAPI) SendTransaction(ctx context.Context, args params.SendTxArgs, passwd string) (common.Hash, error) {
return e.ethAPI.SendTransaction(args)
}
// Sign calculates an Ethereum ECDSA signature for:
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// keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))
//
// Note, the produced signature conforms to the secp256k1 curve R, S and V values,
// where the V value will be 27 or 28 for legacy reasons.
//
// The key used to calculate the signature is decrypted with the given password.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_sign
func (e *PersonalEthAPI) Sign(ctx context.Context, data hexutil.Bytes, addr common.Address, passwd string) (hexutil.Bytes, error) {
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key, ok := checkKeyInKeyring(e.keys, addr)
if !ok {
return nil, fmt.Errorf("cannot find key with given address")
}
sig, err := crypto.Sign(accounts.TextHash(data), key.ToECDSA())
if err != nil {
return nil, err
}
sig[crypto.RecoveryIDOffset] += 27 // transform V from 0/1 to 27/28
return sig, nil
}
// EcRecover returns the address for the account that was used to create the signature.
// Note, this function is compatible with eth_sign and personal_sign. As such it recovers
// the address of:
// hash = keccak256("\x19Ethereum Signed Message:\n"${message length}${message})
// addr = ecrecover(hash, signature)
//
// Note, the signature must conform to the secp256k1 curve R, S and V values, where
// the V value must be 27 or 28 for legacy reasons.
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecove
func (e *PersonalEthAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != crypto.SignatureLength {
return common.Address{}, fmt.Errorf("signature must be %d bytes long", crypto.SignatureLength)
}
if sig[crypto.RecoveryIDOffset] != 27 && sig[crypto.RecoveryIDOffset] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {
return common.Address{}, err
}
return crypto.PubkeyToAddress(*rpk), nil
}