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const EventEmitter = require('events').EventEmitter
const Wallet = require('ethereumjs-wallet')
const ethUtil = require('ethereumjs-util')
const type = 'Simple Key Pair'
const sigUtil = require('../lib/sig-util')
class SimpleKeyring extends EventEmitter {
/* PUBLIC METHODS */
constructor (opts) {
super()
this.type = type
this.opts = opts || {}
this.wallets = []
}
serialize () {
return Promise.resolve(this.wallets.map(w => w.getPrivateKey().toString('hex')))
}
deserialize (privateKeys = []) {
return new Promise((resolve, reject) => {
try {
this.wallets = privateKeys.map((privateKey) => {
const stripped = ethUtil.stripHexPrefix(privateKey)
const buffer = new Buffer(stripped, 'hex')
const wallet = Wallet.fromPrivateKey(buffer)
return wallet
})
} catch (e) {
reject(e)
}
resolve()
})
}
addAccounts (n = 1) {
var newWallets = []
for (var i = 0; i < n; i++) {
newWallets.push(Wallet.generate())
}
this.wallets = this.wallets.concat(newWallets)
const hexWallets = newWallets.map(w => ethUtil.bufferToHex(w.getAddress()))
return Promise.resolve(hexWallets)
}
getAccounts () {
return Promise.resolve(this.wallets.map(w => ethUtil.bufferToHex(w.getAddress())))
}
// 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 Promise.resolve(tx)
}
// For eth_sign, we need to sign transactions:
signMessage (withAccount, data) {
const wallet = this._getWalletForAccount(withAccount)
const message = ethUtil.stripHexPrefix(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 Promise.resolve(rawMsgSig)
}
exportAccount (address) {
const wallet = this._getWalletForAccount(address)
return Promise.resolve(wallet.getPrivateKey().toString('hex'))
}
/* PRIVATE METHODS */
_getWalletForAccount (account) {
let wallet = this.wallets.find(w => ethUtil.bufferToHex(w.getAddress()) === account)
if (!wallet) throw new Error('Simple Keyring - Unable to find matching address.')
return wallet
}
}
SimpleKeyring.type = type
module.exports = SimpleKeyring
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