mirror of
https://github.com/tornadocash/tornado-core.git
synced 2024-11-22 09:47:13 +01:00
500 lines
19 KiB
JavaScript
Executable File
500 lines
19 KiB
JavaScript
Executable File
#!/usr/bin/env NODE_OPTIONS=--no-warnings node
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// Temporary demo client
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// Works both in browser and node.js
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require('dotenv').config()
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const fs = require('fs')
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const axios = require('axios')
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const assert = require('assert')
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const snarkjs = require('snarkjs')
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const crypto = require('crypto')
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const circomlib = require('circomlib')
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const bigInt = snarkjs.bigInt
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const merkleTree = require('./lib/MerkleTree')
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const Web3 = require('web3')
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const buildGroth16 = require('websnark/src/groth16')
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const websnarkUtils = require('websnark/src/utils')
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const { toWei, fromWei, toBN, BN } = require('web3-utils')
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const config = require('./config')
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const program = require('commander')
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let web3, tornado, circuit, proving_key, groth16, erc20, senderAccount, netId
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let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, PRIVATE_KEY
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/** Whether we are in a browser or node.js */
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const inBrowser = (typeof window !== 'undefined')
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let isLocalRPC = false
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const networks = { '1': 'mainnet', '42': 'kovan' }
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/** Generate random number of specified byte length */
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const rbigint = nbytes => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
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/** Compute pedersen hash */
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const pedersenHash = data => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
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/** BigNumber to hex string of specified length */
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function toHex(number, length = 32) {
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const str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16)
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return '0x' + str.padStart(length * 2, '0')
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}
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/** Display ETH account balance */
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async function printETHBalance({ address, name }) {
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console.log(`${name} ETH balance is`, web3.utils.fromWei(await web3.eth.getBalance(address)))
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}
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/** Display ERC20 account balance */
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async function printERC20Balance({ address, name, tokenAddress }) {
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const erc20ContractJson = require('./build/contracts/ERC20Mock.json')
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erc20 = tokenAddress ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : erc20
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console.log(`${name} Token Balance is`, web3.utils.fromWei(await erc20.methods.balanceOf(address).call()))
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}
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/**
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* Create deposit object from secret and nullifier
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*/
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function createDeposit({ nullifier, secret }) {
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const deposit = { nullifier, secret }
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deposit.preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
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deposit.commitment = pedersenHash(deposit.preimage)
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deposit.nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
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return deposit
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}
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/**
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* Make a deposit
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* @param currency Сurrency
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* @param amount Deposit amount
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*/
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async function deposit({ currency, amount }) {
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const deposit = createDeposit({ nullifier: rbigint(31), secret: rbigint(31) })
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const note = toHex(deposit.preimage, 62)
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const noteString = `tornado-${currency}-${amount}-${netId}-${note}`
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console.log(`Your note: ${noteString}`)
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if (currency === 'eth') {
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await printETHBalance({ address: tornado._address, name: 'Tornado' })
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await printETHBalance({ address: senderAccount, name: 'Sender account' })
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const value = isLocalRPC ? ETH_AMOUNT : fromDecimals({ amount, decimals: 18 })
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console.log('Submitting deposit transaction')
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await tornado.methods.deposit(toHex(deposit.commitment)).send({ value, from: senderAccount, gas:2e6 })
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await printETHBalance({ address: tornado._address, name: 'Tornado' })
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await printETHBalance({ address: senderAccount, name: 'Sender account' })
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} else { // a token
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await printERC20Balance({ address: tornado._address, name: 'Tornado' })
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await printERC20Balance({ address: senderAccount, name: 'Sender account' })
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const decimals = isLocalRPC ? 18 : config.deployments[`netId${netId}`][currency].decimals
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const tokenAmount = isLocalRPC ? TOKEN_AMOUNT : fromDecimals({ amount, decimals })
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if(isLocalRPC) {
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console.log('Minting some test tokens to deposit')
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await erc20.methods.mint(senderAccount, tokenAmount).send({ from: senderAccount, gas: 2e6 })
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}
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const allowance = await erc20.methods.allowance(senderAccount, tornado._address).call({ from: senderAccount })
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console.log('Current allowance is', fromWei(allowance))
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if (toBN(allowance).lt(toBN(tokenAmount))) {
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console.log('Approving tokens for deposit')
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await erc20.methods.approve(tornado._address, tokenAmount).send({ from: senderAccount, gas:1e6 })
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}
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console.log('Submitting deposit transaction')
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await tornado.methods.deposit(toHex(deposit.commitment)).send({ from: senderAccount, gas:2e6 })
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await printERC20Balance({ address: tornado._address, name: 'Tornado' })
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await printERC20Balance({ address: senderAccount, name: 'Sender account' })
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}
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return noteString
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}
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/**
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* Generate merkle tree for a deposit.
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* Download deposit events from the tornado, reconstructs merkle tree, finds our deposit leaf
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* in it and generates merkle proof
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* @param deposit Deposit object
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*/
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async function generateMerkleProof(deposit) {
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// Get all deposit events from smart contract and assemble merkle tree from them
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console.log('Getting current state from tornado contract')
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const events = await tornado.getPastEvents('Deposit', { fromBlock: 0, toBlock: 'latest' })
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const leaves = events
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.sort((a, b) => a.returnValues.leafIndex - b.returnValues.leafIndex) // Sort events in chronological order
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.map(e => e.returnValues.commitment)
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const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
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// Find current commitment in the tree
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const depositEvent = events.find(e => e.returnValues.commitment === toHex(deposit.commitment))
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const leafIndex = depositEvent ? depositEvent.returnValues.leafIndex : -1
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// Validate that our data is correct
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const isValidRoot = await tornado.methods.isKnownRoot(toHex(await tree.root())).call()
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const isSpent = await tornado.methods.isSpent(toHex(deposit.nullifierHash)).call()
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assert(isValidRoot === true, 'Merkle tree is corrupted')
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assert(isSpent === false, 'The note is already spent')
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assert(leafIndex >= 0, 'The deposit is not found in the tree')
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// Compute merkle proof of our commitment
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return tree.path(leafIndex)
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}
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/**
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* Generate SNARK proof for withdrawal
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* @param deposit Deposit object
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* @param recipient Funds recipient
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* @param relayer Relayer address
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* @param fee Relayer fee
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* @param refund Receive ether for exchanged tokens
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*/
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async function generateProof({ deposit, recipient, relayerAddress = 0, fee = 0, refund = 0 }) {
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// Compute merkle proof of our commitment
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const { root, path_elements, path_index } = await generateMerkleProof(deposit)
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// Prepare circuit input
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const input = {
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// Public snark inputs
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root: root,
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nullifierHash: deposit.nullifierHash,
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recipient: bigInt(recipient),
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relayer: bigInt(relayerAddress),
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fee: bigInt(fee),
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refund: bigInt(refund),
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// Private snark inputs
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nullifier: deposit.nullifier,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndices: path_index,
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}
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console.log('Generating SNARK proof')
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console.time('Proof time')
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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console.timeEnd('Proof time')
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const args = [
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toHex(input.root),
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toHex(input.nullifierHash),
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toHex(input.recipient, 20),
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toHex(input.relayer, 20),
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toHex(input.fee),
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toHex(input.refund)
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]
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return { proof, args }
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}
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/**
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* Do an ETH withdrawal
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* @param noteString Note to withdraw
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* @param recipient Recipient address
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*/
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async function withdraw({ deposit, currency, amount, recipient, relayerURL, refund = '0' }) {
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if (currency === 'eth' && refund !== '0') {
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throw new Error('The ETH purchase is supposted to be 0 for ETH withdrawals')
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}
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refund = toWei(refund)
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if (relayerURL) {
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const relayerStatus = await axios.get(relayerURL + '/status')
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const { relayerAddress, netId, gasPrices, ethPrices, relayerServiceFee } = relayerStatus.data
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assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
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console.log('Relay address: ', relayerAddress)
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const decimals = isLocalRPC ? 18 : config.deployments[`netId${netId}`][currency].decimals
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const fee = calculateFee({ gasPrices, currency, amount, refund, ethPrices, relayerServiceFee, decimals })
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if (fee.gt(fromDecimals({ amount, decimals }))) {
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throw new Error('Too high refund')
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}
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const { proof, args } = await generateProof({ deposit, recipient, relayerAddress, fee, refund })
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console.log('Sending withdraw transaction through relay')
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try{
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const relay = await axios.post(relayerURL + '/relay', { contract: tornado._address, proof, args })
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if (netId === 1 || netId === 42) {
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console.log(`Transaction submitted through the relay. View transaction on etherscan https://${networks[netId]}.etherscan.io/tx/${relay.data.txHash}`)
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} else {
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console.log(`Transaction submitted through the relay. The transaction hash is ${relay.data.txHash}`)
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}
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const receipt = await waitForTxReceipt({ txHash: relay.data.txHash })
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console.log('Transaction mined in block', receipt.blockNumber)
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} catch(e) {
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if (e.response) {
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console.error(e.response.data.error)
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} else {
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console.error(e.message)
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}
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}
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} else { // using private key
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const { proof, args } = await generateProof({ deposit, recipient, refund })
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console.log('Submitting withdraw transaction')
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await tornado.methods.withdraw(proof, ...args).send({ from: senderAccount, value: refund.toString(), gas: 1e6 })
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.on('transactionHash', function(txHash){
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if (netId === 1 || netId === 42) {
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console.log(`View transaction on etherscan https://${networks[netId]}.etherscan.io/tx/${txHash}`)
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} else {
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console.log(`The transaction hash is ${txHash}`)
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}
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}).on('error', function(e){
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console.error('on transactionHash error', e.message)
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})
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}
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console.log('Done')
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}
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function fromDecimals({ amount, decimals }) {
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amount = amount.toString()
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let ether = amount.toString()
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const base = new BN('10').pow(new BN(decimals))
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const baseLength = base.toString(10).length - 1 || 1
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const negative = ether.substring(0, 1) === '-'
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if (negative) {
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ether = ether.substring(1)
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}
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if (ether === '.') {
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throw new Error('[ethjs-unit] while converting number ' + amount + ' to wei, invalid value')
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}
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// Split it into a whole and fractional part
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const comps = ether.split('.')
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if (comps.length > 2) {
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throw new Error(
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'[ethjs-unit] while converting number ' + amount + ' to wei, too many decimal points'
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)
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}
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let whole = comps[0]
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let fraction = comps[1]
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if (!whole) {
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whole = '0'
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}
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if (!fraction) {
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fraction = '0'
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}
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if (fraction.length > baseLength) {
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throw new Error(
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'[ethjs-unit] while converting number ' + amount + ' to wei, too many decimal places'
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)
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}
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while (fraction.length < baseLength) {
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fraction += '0'
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}
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whole = new BN(whole)
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fraction = new BN(fraction)
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let wei = whole.mul(base).add(fraction)
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if (negative) {
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wei = wei.mul(negative)
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}
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return new BN(wei.toString(10), 10)
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}
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function calculateFee({ gasPrices, currency, amount, refund, ethPrices, relayerServiceFee, decimals }) {
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const feePercent = toBN(fromDecimals({ amount, decimals })).mul(toBN(relayerServiceFee * 10)).div(toBN('1000'))
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const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(5e5))
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let desiredFee
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switch (currency) {
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case 'eth': {
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desiredFee = expense.add(feePercent)
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break
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}
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default: {
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desiredFee =
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expense.add(toBN(refund))
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.mul(toBN(10 ** decimals))
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.div(toBN(ethPrices[currency]))
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desiredFee = desiredFee.add(feePercent)
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break
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}
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}
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return desiredFee
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}
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/**
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* Waits for transaction to be mined
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* @param txHash Hash of transaction
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* @param attempts
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* @param delay
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*/
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function waitForTxReceipt({ txHash, attempts = 60, delay = 1000 }) {
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return new Promise((resolve, reject) => {
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const checkForTx = async (txHash, retryAttempt = 0) => {
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const result = await web3.eth.getTransactionReceipt(txHash)
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if (!result || !result.blockNumber) {
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if (retryAttempt <= attempts) {
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setTimeout(() => checkForTx(txHash, retryAttempt + 1), delay)
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} else {
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reject(new Error('tx was not mined'))
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}
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} else {
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resolve(result)
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}
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}
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checkForTx(txHash)
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})
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}
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/**
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* Parses Tornado.cash note
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* @param noteString the note
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*/
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function parseNote(noteString) {
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const noteRegex = /tornado-(?<currency>\w+)-(?<amount>[\d.]+)-(?<netId>\d+)-0x(?<note>[0-9a-fA-F]{124})/g
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const match = noteRegex.exec(noteString)
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if (!match) {
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throw new Error('The note has invalid format')
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}
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const buf = Buffer.from(match.groups.note, 'hex')
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const nullifier = bigInt.leBuff2int(buf.slice(0, 31))
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const secret = bigInt.leBuff2int(buf.slice(31, 62))
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const deposit = createDeposit({ nullifier, secret })
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const netId = Number(match.groups.netId)
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return { currency: match.groups.currency, amount: match.groups.amount, netId, deposit }
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}
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/**
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* Init web3, contracts, and snark
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*/
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async function init({ rpc, noteNetId, currency = 'dai', amount = '100' }) {
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let contractJson, erc20ContractJson, erc20tornadoJson, tornadoAddress, tokenAddress
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// TODO do we need this? should it work in browser really?
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if (inBrowser) {
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// Initialize using injected web3 (Metamask)
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// To assemble web version run `npm run browserify`
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web3 = new Web3(window.web3.currentProvider, null, { transactionConfirmationBlocks: 1 })
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contractJson = await (await fetch('build/contracts/ETHTornado.json')).json()
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circuit = await (await fetch('build/circuits/withdraw.json')).json()
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proving_key = await (await fetch('build/circuits/withdraw_proving_key.bin')).arrayBuffer()
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MERKLE_TREE_HEIGHT = 20
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ETH_AMOUNT = 1e18
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TOKEN_AMOUNT = 1e19
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senderAccount = (await web3.eth.getAccounts())[0]
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} else {
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// Initialize from local node
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web3 = new Web3(rpc, null, { transactionConfirmationBlocks: 1 })
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contractJson = require('./build/contracts/ETHTornado.json')
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circuit = require('./build/circuits/withdraw.json')
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proving_key = fs.readFileSync('build/circuits/withdraw_proving_key.bin').buffer
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MERKLE_TREE_HEIGHT = process.env.MERKLE_TREE_HEIGHT
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ETH_AMOUNT = process.env.ETH_AMOUNT
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TOKEN_AMOUNT = process.env.TOKEN_AMOUNT
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PRIVATE_KEY = process.env.PRIVATE_KEY
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erc20ContractJson = require('./build/contracts/ERC20Mock.json')
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erc20tornadoJson = require('./build/contracts/ERC20Tornado.json')
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const account = web3.eth.accounts.privateKeyToAccount('0x' + PRIVATE_KEY)
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web3.eth.accounts.wallet.add('0x' + PRIVATE_KEY)
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web3.eth.defaultAccount = account.address
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senderAccount = account.address
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}
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// groth16 initialises a lot of Promises that will never be resolved, that's why we need to use process.exit to terminate the CLI
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groth16 = await buildGroth16()
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netId = await web3.eth.net.getId()
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if (noteNetId && Number(noteNetId) !== netId) {
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throw new Error('This note is for a different network. Specify the --rpc option explicitly')
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}
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isLocalRPC = netId > 42
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if (isLocalRPC) {
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tornadoAddress = currency === 'eth' ? contractJson.networks[netId].address : erc20tornadoJson.networks[netId].address
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tokenAddress = currency !== 'eth' ? erc20ContractJson.networks[netId].address : null
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senderAccount = (await web3.eth.getAccounts())[0]
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} else {
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try{
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tornadoAddress = config.deployments[`netId${netId}`][currency].instanceAddress[amount]
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if (!tornadoAddress) {
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throw new Error()
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}
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tokenAddress = config.deployments[`netId${netId}`][currency].tokenAddress
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} catch(e) {
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console.error('There is no such tornado instance, check the currency and amount you provide')
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process.exit(1)
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}
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}
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tornado = new web3.eth.Contract(contractJson.abi, tornadoAddress)
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erc20 = currency !== 'eth' ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : {}
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}
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async function main() {
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if (inBrowser) {
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const instance = { currency: 'eth', amount: '0.1' }
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await init(instance)
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window.deposit = async () => {
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await deposit(instance)
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}
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window.withdraw = async () => {
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const noteString = prompt('Enter the note to withdraw')
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const recipient = (await web3.eth.getAccounts())[0]
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const { currency, amount, netId, deposit } = parseNote(noteString)
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await init({ noteNetId: netId, currency, amount })
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await withdraw({ deposit, currency, amount, recipient })
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}
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} else {
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program
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.option('-r, --rpc <URL>', 'The RPC, CLI should interact with', 'http://localhost:8545')
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.option('-R, --relayer <URL>', 'Withdraw via relayer')
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program
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.command('deposit <currency> <amount>')
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.description('Submit a deposit of specified currency and amount from default eth account and return the resulting note. The currency is one of (ETH|DAI|cDAI|USDC|cUSDC|USDT). The amount depends on currency, see config.js file or visit https://tornado.cash.')
|
||
.action(async (currency, amount) => {
|
||
currency = currency.toLowerCase()
|
||
await init({ rpc: program.rpc, currency, amount })
|
||
await deposit({ currency, amount })
|
||
})
|
||
program
|
||
.command('withdraw <note> <recipient> [ETH_purchase]')
|
||
.description('Withdraw a note to a recipient account using relayer or specified private key. You can exchange some of your deposit`s tokens to ETH during the withdrawal by specifing ETH_purchase (e.g. 0.01) to pay for gas in future transactions. Also see the --relayer option.')
|
||
.action(async (noteString, recipient, refund) => {
|
||
const { currency, amount, netId, deposit } = parseNote(noteString)
|
||
await init({ rpc: program.rpc, noteNetId: netId, currency, amount })
|
||
await withdraw({ deposit, currency, amount, recipient, refund, relayerURL: program.relayer })
|
||
})
|
||
program
|
||
.command('balance <address> [token_address]')
|
||
.description('Check ETH and ERC20 balance')
|
||
.action(async (address, tokenAddress) => {
|
||
await init({ rpc: program.rpc })
|
||
await printETHBalance({ address, name: '' })
|
||
if (tokenAddress) {
|
||
await printERC20Balance({ address, name: '', tokenAddress })
|
||
}
|
||
})
|
||
program
|
||
.command('test')
|
||
.description('Perform an automated test. It deposits and withdraws one ETH and one ERC20 note. Uses ganache.')
|
||
.action(async () => {
|
||
console.log('Start performing ETH deposit-withdraw test')
|
||
let currency = 'eth'
|
||
let amount = '0.1'
|
||
await init({ rpc: program.rpc, currency, amount })
|
||
let noteString = await deposit({ currency, amount })
|
||
let parsedNote = parseNote(noteString)
|
||
await withdraw({ deposit: parsedNote.deposit, currency, amount, recipient: senderAccount, relayerURL: program.relayer })
|
||
|
||
console.log('\nStart performing DAI deposit-withdraw test')
|
||
currency = 'dai'
|
||
amount = '100'
|
||
await init({ rpc: program.rpc, currency, amount })
|
||
noteString = await deposit({ currency, amount })
|
||
;(parsedNote = parseNote(noteString))
|
||
await withdraw({ deposit: parsedNote.deposit, currency, amount, recipient: senderAccount, refund: '0.02', relayerURL: program.relayer })
|
||
})
|
||
try {
|
||
await program.parseAsync(process.argv)
|
||
process.exit(0)
|
||
} catch(e) {
|
||
console.log('Error:', e)
|
||
process.exit(1)
|
||
}
|
||
}
|
||
}
|
||
|
||
main()
|