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const EventEmitter = require('events').EventEmitter
const hdkey = require('ethereumjs-wallet/hdkey')
const bip39 = require('bip39')
const ethUtil = require('ethereumjs-util')
const sigUtil = require('../lib/sig-util')
const type = 'HD Key Tree'
const hdPathString = `m/44'/60'/0'/0`
module.exports = class HdKeyring extends EventEmitter {
static type () {
return type
}
constructor (opts = {}) {
super()
this.type = type
this.deserialize(opts)
}
deserialize (opts = {}) {
this.opts = opts || {}
this.wallets = []
this.mnemonic = null
this.root = null
if ('mnemonic' in opts) {
this.initFromMnemonic(opts.mnemonic)
}
if ('numberOfAccounts' in opts) {
this.addAccounts(opts.numberOfAccounts)
}
}
initFromMnemonic (mnemonic) {
this.mnemonic = mnemonic
const seed = bip39.mnemonicToSeed(mnemonic)
this.hdWallet = hdkey.fromMasterSeed(seed)
this.root = this.hdWallet.derivePath(hdPathString)
}
serialize () {
return {
mnemonic: this.mnemonic,
numberOfAccounts: this.wallets.length,
}
}
exportAccount (address) {
const wallet = this.getWalletForAccount(address)
return wallet.getPrivateKey().toString('hex')
}
addAccounts (numberOfAccounts = 1) {
if (!this.root) {
this.initFromMnemonic(bip39.generateMnemonic())
}
const oldLen = this.wallets.length
const newWallets = []
for (let i = oldLen; i < numberOfAccounts + oldLen; i++) {
const child = this.root.deriveChild(i)
const wallet = child.getWallet()
newWallets.push(wallet)
this.wallets.push(wallet)
}
return newWallets.map(w => w.getAddress().toString('hex'))
}
getAccounts () {
return this.wallets.map(w => w.getAddress().toString('hex'))
}
// tx is an instance of the ethereumjs-transaction class.
signTransaction (address, tx) {
const wallet = this.getWalletForAccount(address)
var privKey = wallet.getPrivateKey()
tx.sign(privKey)
return tx
}
// For eth_sign, we need to sign transactions:
signMessage (withAccount, data) {
const wallet = this.getWalletForAccount(withAccount)
const message = ethUtil.removeHexPrefix(data)
var privKey = wallet.getPrivateKey()
var msgSig = ethUtil.ecsign(new Buffer(message, 'hex'), privKey)
var rawMsgSig = ethUtil.bufferToHex(sigUtil.concatSig(msgSig.v, msgSig.r, msgSig.s))
return rawMsgSig
}
getWalletForAccount (account) {
return this.wallets.find((w) => {
const address = w.getAddress().toString('hex')
return ((address === account) || (sigUtil.normalize(address) === account))
})
}
}
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