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EthereumMetaMaskProvider.js
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EthereumMetaMaskProvider.js
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import _ from 'lodash'
import { BigNumber } from 'bignumber.js'
import WalletProvider from '../WalletProvider'
import { formatEthResponse, ensureHexEthFormat, ensureHexStandardFormat } from './EthereumUtil'
import { WalletError } from '../../errors'
import networks from './networks'
export default class EthereumMetaMaskProvider extends WalletProvider {
constructor (metamaskProvider, network) {
super(network)
if (!_.isFunction(metamaskProvider.sendAsync)) {
throw new Error('Invalid MetaMask Provider')
}
this._metamaskProvider = metamaskProvider
this._network = network
}
async isWalletAvailable () {
const addresses = await this._toMM('eth_accounts')
return addresses.length > 0
}
_toMM (method, ...params) {
return new Promise((resolve, reject) => {
this
._metamaskProvider
.sendAsync({ method, params }, (err, data) => {
const error = err || data.error
if (error) {
reject(new WalletError(error.toString(), error))
return
}
if (!data) {
reject(new WalletError('Metamask response was empty'))
return
}
if (typeof data.result === 'undefined') {
reject(new WalletError('Metamask response was empty'))
return
}
const formattedResult = formatEthResponse(data.result)
resolve(formattedResult)
})
})
}
async getAddresses () {
const addresses = await this._toMM('eth_accounts')
if (addresses.length === 0) {
throw new WalletError('Metamask: No addresses available from wallet')
}
return addresses.map((address) => { return { address: address } })
}
async getUsedAddresses (startingIndex, numAddresses) {
return this.getAddresses()
}
async getUnusedAddress () {
const addresses = await this.getAddresses()
return addresses[0]
}
async signMessage (message) {
const hex = Buffer.from(message).toString('hex')
const addresses = await this.getAddresses()
const address = addresses[0].address
return this._toMM('personal_sign', `0x${hex}`, `0x${address}`)
}
async getWalletInfo () {
const unusedAddressObj = await this.getUnusedAddress()
const unusedAddress = unusedAddressObj.address
const balance = await this.getMethod('getBalance')([unusedAddress])
return { balance, unusedAddress, usedAddresses: [] }
}
async sendTransaction (to, value, data, from = null) {
const networkId = await this.getWalletNetworkId()
if (this._network) {
if (networkId !== this._network.networkId) {
throw new Error('Invalid MetaMask Network')
}
}
if (to != null) {
to = ensureHexEthFormat(to)
}
if (from == null) {
const addresses = await this.getAddresses()
from = ensureHexEthFormat(addresses[0].address)
}
value = BigNumber(value).toString(16)
const tx = {
from: ensureHexEthFormat(from),
to,
value: ensureHexEthFormat(value),
data: ensureHexEthFormat(data)
}
const txHash = await this._toMM('eth_sendTransaction', tx)
return ensureHexStandardFormat(txHash)
}
async getWalletNetworkId () {
const networkId = await this._toMM('net_version')
return parseInt(networkId)
}
async getConnectedNetwork () {
const networkId = await this.getWalletNetworkId()
const network = _.findKey(networks, network => network.networkId === networkId)
if (networkId && !network) {
return { name: 'unknown', networkId }
}
return networks[network]
}
}