eth: add personal_importRawKey for runtime private key import

accounts/account_manager.go

@@ -284,7 +284,12 @@ func (am *Manager) Import(keyJSON []byte, passphrase, newPassphrase string) (Acc
 
 // ImportECDSA stores the given key into the key directory, encrypting it with the passphrase.
 func (am *Manager) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (Account, error) {
-	return am.importKey(newKeyFromECDSA(priv), passphrase)
+	key := newKeyFromECDSA(priv)
+	if am.cache.hasAddress(key.Address) {
+		return Account{}, fmt.Errorf("account already exists")
+	}
+
+	return am.importKey(key, passphrase)
 }
 
 func (am *Manager) importKey(key *Key, passphrase string) (Account, error) {

eth/api.go

@@ -18,6 +18,7 @@ package eth
 
 import (
 	"bytes"
+	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -439,6 +440,16 @@ func (s *PrivateAccountAPI) NewAccount(password string) (common.Address, error)
 	return common.Address{}, err
 }
 
+func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
+	hexkey, err := hex.DecodeString(privkey)
+	if err != nil {
+		return common.Address{}, err
+	}
+
+	acc, err := s.am.ImportECDSA(crypto.ToECDSA(hexkey), password)
+	return acc.Address, err
+}
+
 // 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.

internal/web3ext/web3ext.go

@@ -20,6 +20,7 @@ package web3ext
 var Modules = map[string]string{
 	"txpool":   TxPool_JS,
 	"admin":    Admin_JS,
+	"personal": Personal_JS,
 	"eth":      Eth_JS,
 	"miner":    Miner_JS,
 	"debug":    Debug_JS,
@@ -175,6 +176,20 @@ web3._extend({
 });
 `
 
+const Personal_JS = `
+web3._extend({
+	property: 'personal',
+	methods:
+	[
+		new web3._extend.Method({
+			name: 'importRawKey',
+			call: 'personal_importRawKey',
+			params: 2
+		})
+	]
+});
+`
+
 const Eth_JS = `
 web3._extend({
 	property: 'eth',