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|
const { EventEmitter } = require('events')
const ethUtil = require('ethereumjs-util')
// const sigUtil = require('eth-sig-util')
const hdPathString = `m/44'/60'/0'/0`
const keyringType = 'Trezor Hardware'
const Transaction = require('ethereumjs-tx')
const pathBase = 'm'
const TrezorConnect = require('./trezor-connect.js')
const HDKey = require('hdkey')
const TREZOR_MIN_FIRMWARE_VERSION = '1.5.2'
const log = require('loglevel')
class TrezorKeyring extends EventEmitter {
constructor (opts = {}) {
super()
this.type = keyringType
this.accounts = []
this.hdk = new HDKey()
this.deserialize(opts)
this.page = 0
this.perPage = 5
this.unlockedAccount = 0
}
serialize () {
return Promise.resolve({
hdPath: this.hdPath,
accounts: this.accounts,
page: this.page,
})
}
deserialize (opts = {}) {
this.hdPath = opts.hdPath || hdPathString
this.accounts = opts.accounts || []
this.page = opts.page || 0
return Promise.resolve()
}
unlock () {
if (this.hdk.publicKey) return Promise.resolve()
return new Promise((resolve, reject) => {
TrezorConnect.getXPubKey(
this.hdPath,
response => {
if (response.success) {
this.hdk.publicKey = new Buffer(response.publicKey, 'hex')
this.hdk.chainCode = new Buffer(response.chainCode, 'hex')
resolve()
} else {
reject(response.error || 'Unknown error')
}
},
TREZOR_MIN_FIRMWARE_VERSION
)
})
}
setAccountToUnlock (index) {
this.unlockedAccount = parseInt(index, 10)
}
addAccounts (n = 1) {
return new Promise((resolve, reject) => {
return this.unlock()
.then(_ => {
const from = this.unlockedAccount
const to = from + 1
this.accounts = []
for (let i = from; i < to; i++) {
this.accounts.push(this._addressFromId(pathBase, i))
this.page = 0
}
resolve(this.accounts)
})
.catch(e => {
reject(e)
})
})
}
getPage () {
return new Promise((resolve, reject) => {
return this.unlock()
.then(_ => {
const from = this.page === 0 ? 0 : (this.page - 1) * this.perPage
const to = from + this.perPage
const accounts = []
for (let i = from; i < to; i++) {
accounts.push({
address: this._addressFromId(pathBase, i),
balance: 0,
index: i,
})
}
log.debug(accounts)
resolve(accounts)
})
.catch(e => {
reject(e)
})
})
}
async getPrevAccountSet () {
this.page--
return await this.getPage()
}
async getNextAccountSet () {
this.page++
return await this.getPage()
}
getAccounts () {
return Promise.resolve(this.accounts.slice())
}
// tx is an instance of the ethereumjs-transaction class.
async signTransaction (address, tx) {
return new Promise((resolve, reject) => {
log.debug('sign transaction ', address, tx)
const account = `m/44'/60'/0'/${this.unlockedAccount}`
const txData = {
account,
nonce: this._cleanData(tx.nonce),
gasPrice: this._cleanData(tx.gasPrice),
gasLimit: this._cleanData(tx.gasLimit),
to: this._cleanData(tx.to),
value: this._cleanData(tx.value),
data: this._cleanData(tx.data),
chainId: tx._chainId,
}
TrezorConnect.ethereumSignTx(
txData.account,
txData.nonce,
txData.gasPrice,
txData.gasLimit,
txData.to,
txData.value,
txData.data === '' ? null : txData.data,
txData.chainId,
response => {
if (response.success) {
tx.v = `0x${response.v.toString(16)}`
tx.r = `0x${response.r}`
tx.s = `0x${response.s}`
log.debug('about to create new tx with data', tx)
const signedTx = new Transaction(tx)
log.debug('signature is valid?', signedTx.verifySignature())
const addressSignedWith = ethUtil.toChecksumAddress(`0x${signedTx.from.toString('hex')}`)
const correctAddress = ethUtil.toChecksumAddress(address)
if (addressSignedWith !== correctAddress) {
// throw new Error('signature doesnt match the right address')
log.error('signature doesnt match the right address', addressSignedWith, correctAddress)
}
resolve(signedTx)
} else {
throw new Error(response.error || 'Unknown error')
}
},
TREZOR_MIN_FIRMWARE_VERSION)
})
}
async signMessage (withAccount, data) {
throw new Error('Not supported on this device')
}
// For personal_sign, we need to prefix the message:
async signPersonalMessage (withAccount, message) {
// Waiting on trezor to enable this
throw new Error('Not supported on this device')
}
async signTypedData (withAccount, typedData) {
// Waiting on trezor to enable this
throw new Error('Not supported on this device')
}
async exportAccount (address) {
throw new Error('Not supported on this device')
}
_padLeftEven (hex) {
return hex.length % 2 !== 0 ? `0${hex}` : hex
}
_cleanData (buf) {
return this._padLeftEven(ethUtil.bufferToHex(buf).substring(2).toLowerCase())
}
_addressFromId(pathBase, i) {
const dkey = this.hdk.derive(`${pathBase}/${i}`)
const address = ethUtil
.publicToAddress(dkey.publicKey, true)
.toString('hex')
return ethUtil.toChecksumAddress(address)
}
}
TrezorKeyring.type = keyringType
module.exports = TrezorKeyring
|
