support relay in CLI, refactor

cli.js

@@ -2,6 +2,7 @@
 // Temporary demo client
 // Works both in browser and node.js
 const fs = require('fs')
+const axios = require('axios')
 const assert = require('assert')
 const snarkjs = require('snarkjs')
 const crypto = require('crypto')
@@ -11,16 +12,31 @@ const merkleTree = require('./lib/MerkleTree')
 const Web3 = require('web3')
 const buildGroth16 = require('websnark/src/groth16')
 const websnarkUtils = require('websnark/src/utils')
+const { toWei, fromWei } = require('web3-utils')
 
-let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20
+let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20, senderAccount
-let MERKLE_TREE_HEIGHT, ETH_AMOUNT, ERC20_TOKEN
+let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, ERC20_TOKEN
+
+/** Whether we are in a browser or node.js */
 const inBrowser = (typeof window !== 'undefined')
 
 /** Generate random number of specified byte length */
-const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
+const rbigint = nbytes => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
 
 /** Compute pedersen hash */
-const pedersenHash = (data) => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
+const pedersenHash = data => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
+
+/** BigNumber to hex string of specified length */
+function toHex(number, length = 32) {
+  let str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16)
+  return '0x' + str.padStart(length * 2, '0')
+}
+
+/** Display account balance */
+async function printBalance(account, name) {
+  console.log(`${name} ETH balance is`, web3.utils.fromWei(await web3.eth.getBalance(account)))
+  console.log(`${name} Token Balance is`, web3.utils.fromWei(await erc20.methods.balanceOf(account).call()))
+}
 
 /**
  * Create deposit object from secret and nullifier
@@ -29,169 +45,103 @@ function createDeposit(nullifier, secret) {
   let deposit = { nullifier, secret }
   deposit.preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
   deposit.commitment = pedersenHash(deposit.preimage)
+  deposit.nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
   return deposit
 }
 
 /**
- * Make a deposit
+ * Make an ETH deposit
- * @returns {Promise<string>}
  */
 async function deposit() {
   const deposit = createDeposit(rbigint(31), rbigint(31))
 
   console.log('Submitting deposit transaction')
-  await mixer.methods.deposit('0x' + deposit.commitment.toString(16)).send({ value: ETH_AMOUNT, from: (await web3.eth.getAccounts())[0], gas:1e6 })
+  await mixer.methods.deposit(toHex(deposit.commitment)).send({ value: ETH_AMOUNT, from: senderAccount, gas:1e6 })
 
-  const note = '0x' + deposit.preimage.toString('hex')
+  const note = toHex(deposit.preimage, 62)
   console.log('Your note:', note)
   return note
 }
 
+/**
+ * Make an ERC20 deposit
+ */
 async function depositErc20() {
-  const account = (await web3.eth.getAccounts())[0]
-  const tokenAmount = process.env.TOKEN_AMOUNT
-  await erc20.methods.mint(account, tokenAmount).send({ from: account, gas:1e6 })
-
-  await erc20.methods.approve(erc20mixer.address, tokenAmount).send({ from: account, gas:1e6 })
-  const allowance = await erc20.methods.allowance(account, erc20mixer.address).call()
-  console.log('erc20mixer allowance', allowance.toString(10))
-
   const deposit = createDeposit(rbigint(31), rbigint(31))
-  await erc20mixer.methods.deposit('0x' + deposit.commitment.toString(16)).send({ value: ETH_AMOUNT, from: account, gas:1e6 })
 
-  const balance = await erc20.methods.balanceOf(erc20mixer.address).call()
+  if(ERC20_TOKEN === '') {
-  console.log('erc20mixer balance', balance.toString(10))
+    console.log('Minting some test tokens to deposit')
-  const note = '0x' + deposit.preimage.toString('hex')
+    await erc20.methods.mint(senderAccount, TOKEN_AMOUNT).send({ from: senderAccount, gas: 1e6 })
-  console.log('Your note:', note)
-  return note
-}
-
-async function withdrawErc20(note, recipient, relayer) {
-  let buf = Buffer.from(note.slice(2), 'hex')
-  let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
-
-  console.log('Getting current state from mixer contract')
-  const events = await erc20mixer.getPastEvents('Deposit', { fromBlock: erc20mixer.deployedBlock, toBlock: 'latest' })
-  let leafIndex
-
-  const commitment = deposit.commitment.toString(16).padStart('66', '0x000000')
-  const leaves = events
-    .sort((a, b) => a.returnValues.leafIndex.sub(b.returnValues.leafIndex))
-    .map(e => {
-      if (e.returnValues.commitment.eq(commitment)) {
-        leafIndex = e.returnValues.leafIndex.toNumber()
-      }
-      return e.returnValues.commitment
-    })
-  const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
-  const validRoot = await erc20mixer.methods.isKnownRoot(await tree.root()).call()
-  const nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
-  const nullifierHashToCheck = nullifierHash.toString(16).padStart('66', '0x000000')
-  const isSpent = await erc20mixer.methods.isSpent(nullifierHashToCheck).call()
-  assert(validRoot === true)
-  assert(isSpent === false)
-
-  assert(leafIndex >= 0)
-  const { root, path_elements, path_index } = await tree.path(leafIndex)
-  // Circuit input
-  const input = {
-    // public
-    root: root,
-    nullifierHash,
-    recipient: bigInt(recipient),
-    relayer: bigInt(relayer),
-    fee: bigInt(web3.utils.toWei('0.01')),
-    refund: bigInt(0),
-
-    // private
-    nullifier: deposit.nullifier,
-    secret: deposit.secret,
-    pathElements: path_elements,
-    pathIndices: path_index,
   }
 
-  console.log('Generating SNARK proof')
+  console.log('Approving tokens for deposit')
-  console.time('Proof time')
+  await erc20.methods.approve(erc20mixer._address, TOKEN_AMOUNT).send({ from: senderAccount, gas:1e6 })
-  const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
-  const { proof } = websnarkUtils.toSolidityInput(proofData)
-  console.timeEnd('Proof time')
 
-  console.log('Submitting withdraw transaction')
+  console.log('Submitting deposit transaction')
-  const args = [
+  await erc20mixer.methods.deposit(toHex(deposit.commitment)).send({ from: senderAccount, gas:1e6 })
-    toHex(input.root),
+
-    toHex(input.nullifierHash),
+  const note = toHex(deposit.preimage, 62)
-    toHex(input.recipient, 20),
+  console.log('Your note:', note)
-    toHex(input.relayer, 20),
+  return note
-    toHex(input.fee),
-    toHex(input.refund)
-  ]
-  await erc20mixer.methods.withdraw(proof, ...args).send({ from: (await web3.eth.getAccounts())[0], gas: 1e6 })
-  console.log('Done')
 }
 
-async function getBalance(recipient) {
+/**
-  const balance = await web3.eth.getBalance(recipient)
+ * Generate merkle tree for a deposit.
-  console.log('Balance is ', web3.utils.fromWei(balance))
+ * Download deposit events from the contract, reconstructs merkle tree, finds our deposit leaf
-}
+ * in it and generates merkle proof
-
+ * @param contract Mixer contract address
-async function getBalanceErc20(recipient, relayer) {
+ * @param deposit Deposit object
-  const balanceRecipient = await web3.eth.getBalance(recipient)
+ */
-  const balanceRelayer = await web3.eth.getBalance(relayer)
+async function generateMerkleProof(contract, deposit) {
-  const tokenBalanceRecipient = await erc20.methods.balanceOf(recipient).call()
-  const tokenBalanceRelayer = await erc20.methods.balanceOf(relayer).call()
-  console.log('Recipient eth Balance is ', web3.utils.fromWei(balanceRecipient))
-  console.log('Relayer eth Balance is ', web3.utils.fromWei(balanceRelayer))
-
-  console.log('Recipient token Balance is ', web3.utils.fromWei(tokenBalanceRecipient.toString()))
-  console.log('Relayer token Balance is ', web3.utils.fromWei(tokenBalanceRelayer.toString()))
-}
-
-function toHex(number, length = 32) {
-  let str = bigInt(number).toString(16)
-  while (str.length < length * 2) str = '0' + str
-  str = '0x' + str
-  return str
-}
-
-async function withdraw(note, recipient) {
-  // Decode hex string and restore the deposit object
-  let buf = Buffer.from(note.slice(2), 'hex')
-  let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
-  const nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
-  const paddedNullifierHash = nullifierHash.toString(16).padStart('66', '0x000000')
-  const paddedCommitment = deposit.commitment.toString(16).padStart('66', '0x000000')
-
   // Get all deposit events from smart contract and assemble merkle tree from them
   console.log('Getting current state from mixer contract')
-  const events = await mixer.getPastEvents('Deposit', { fromBlock: mixer.deployedBlock, toBlock: 'latest' })
+  const events = await contract.getPastEvents('Deposit', { fromBlock: contract.deployedBlock, toBlock: 'latest' })
   const leaves = events
     .sort((a, b) => a.returnValues.leafIndex - b.returnValues.leafIndex) // Sort events in chronological order
     .map(e => e.returnValues.commitment)
   const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)
 
   // Find current commitment in the tree
-  let depositEvent = events.find(e => e.returnValues.commitment === paddedCommitment)
+  let depositEvent = events.find(e => e.returnValues.commitment === toHex(deposit.commitment))
   let leafIndex = depositEvent ? depositEvent.returnValues.leafIndex : -1
 
   // Validate that our data is correct
-  const isValidRoot = await mixer.methods.isKnownRoot(toHex(await tree.root())).call()
+  const isValidRoot = await contract.methods.isKnownRoot(toHex(await tree.root())).call()
-  const isSpent = await mixer.methods.isSpent(paddedNullifierHash).call()
+  const isSpent = await contract.methods.isSpent(toHex(deposit.nullifierHash)).call()
-  assert(isValidRoot === true) // Merkle tree assembled correctly
+  assert(isValidRoot === true, 'Merkle tree is corrupted')
-  assert(isSpent === false)    // The note is not spent
+  assert(isSpent === false, 'The note is already spent')
-  assert(leafIndex >= 0)       // Our deposit is present in the tree
+  assert(leafIndex >= 0, 'The deposit is not found in the tree')
 
   // Compute merkle proof of our commitment
-  const { root, path_elements, path_index } = await tree.path(leafIndex)
+  return await tree.path(leafIndex)
+}
+
+/**
+ * Generate SNARK proof for withdrawal
+ * @param contract Mixer contract address
+ * @param note Note string
+ * @param recipient Funds recipient
+ * @param relayer Relayer address
+ * @param fee Relayer fee
+ * @param refund Receive ether for exchanged tokens
+ */
+async function generateProof(contract, note, recipient, relayer = 0, fee = 0, refund = 0) {
+  // Decode hex string and restore the deposit object
+  let buf = Buffer.from(note.slice(2), 'hex')
+  let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
+
+  // Compute merkle proof of our commitment
+  const { root, path_elements, path_index } = await generateMerkleProof(contract, deposit)
 
   // Prepare circuit input
   const input = {
     // Public snark inputs
     root: root,
-    nullifierHash,
+    nullifierHash: deposit.nullifierHash,
     recipient: bigInt(recipient),
-    relayer: bigInt(0),
+    relayer: bigInt(relayer),
-    fee: bigInt(0),
+    fee: bigInt(fee),
-    refund: bigInt(0),
+    refund: bigInt(refund),
 
     // Private snark inputs
     nullifier: deposit.nullifier,
@@ -206,7 +156,6 @@ async function withdraw(note, recipient) {
   const { proof } = websnarkUtils.toSolidityInput(proofData)
   console.timeEnd('Proof time')
 
-  console.log('Submitting withdraw transaction')
   const args = [
     toHex(input.root),
     toHex(input.nullifierHash),
@@ -215,10 +164,109 @@ async function withdraw(note, recipient) {
     toHex(input.fee),
     toHex(input.refund)
   ]
-  await mixer.methods.withdraw(proof, ...args).send({ from: (await web3.eth.getAccounts())[0], gas: 1e6 })
+
+  return { proof, args }
+}
+
+/**
+ * Do an ETH withdrawal
+ * @param note Note to withdraw
+ * @param recipient Recipient address
+ */
+async function withdraw(note, recipient) {
+  const { proof, args } = await generateProof(mixer, note, recipient)
+
+  console.log('Submitting withdraw transaction')
+  await mixer.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
   console.log('Done')
 }
 
+/**
+ * Do a ERC20 withdrawal
+ * @param note Note to withdraw
+ * @param recipient Recipient address
+ */
+async function withdrawErc20(note, recipient) {
+  const { proof, args } = await generateProof(erc20mixer, note, recipient)
+
+  console.log('Submitting withdraw transaction')
+  await erc20mixer.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
+  console.log('Done')
+}
+
+/**
+ * Do an ETH withdrawal through relay
+ * @param note Note to withdraw
+ * @param recipient Recipient address
+ * @param relayUrl Relay url address
+ */
+async function withdrawRelay(note, recipient, relayUrl) {
+  const resp = await axios.get(relayUrl + '/status')
+  const { relayerAddress, netId, gasPrices } = resp.data
+  assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
+  console.log('Relay address: ', relayerAddress)
+
+  const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6))
+  const { proof, args } = await generateProof(mixer, note, recipient, relayerAddress, fee)
+
+  console.log('Sending withdraw transaction through relay')
+  const resp2 = await axios.post(relayUrl + '/relay', { contract: mixer._address, proof: { proof, publicSignals: args } })
+  console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
+
+  let receipt = await waitForTxReceipt(resp2.data.txHash)
+  console.log('Transaction mined in block', receipt.blockNumber)
+  console.log('Done')
+}
+
+/**
+ * Do a ERC20 withdrawal through relay
+ * @param note Note to withdraw
+ * @param recipient Recipient address
+ * @param relayUrl Relay url address
+ */
+async function withdrawRelayErc20(note, recipient, relayUrl) {
+  const resp = await axios.get(relayUrl + '/status')
+  const { relayerAddress, netId, gasPrices, ethPriceInDai } = resp.data
+  assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
+  console.log('Relay address: ', relayerAddress)
+
+  const refund = bigInt(toWei('0.001'))
+  const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6)).add(refund).mul(bigInt(fromWei(ethPriceInDai.toString())))
+  const { proof, args } = await generateProof(erc20mixer, note, recipient, relayerAddress, fee, refund)
+
+  console.log('Sending withdraw transaction through relay')
+  const resp2 = await axios.post(relayUrl + '/relay', { contract: erc20mixer._address, proof: { proof, publicSignals: args } })
+  console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
+
+  let receipt = await waitForTxReceipt(resp2.data.txHash)
+  console.log('Transaction mined in block', receipt.blockNumber)
+  console.log('Done')
+}
+
+/**
+ * Waits for transaction to be mined
+ * @param txHash Hash of transaction
+ * @param attempts
+ * @param delay
+ */
+function waitForTxReceipt(txHash, attempts = 60, delay = 1000) {
+  return new Promise((resolve, reject) => {
+    const checkForTx = async (txHash, retryAttempt = 0) => {
+      const result = await web3.eth.getTransactionReceipt(txHash)
+      if (!result || !result.blockNumber) {
+        if (retryAttempt <= attempts) {
+          setTimeout(() => checkForTx(txHash, retryAttempt + 1), delay)
+        } else {
+          reject(new Error('tx was not mined'))
+        }
+      } else {
+        resolve(result)
+      }
+    }
+    checkForTx(txHash)
+  })
+}
+
 /**
  * Init web3, contracts, and snark
  */
@@ -233,6 +281,7 @@ async function init() {
     proving_key = await (await fetch('build/circuits/withdraw_proving_key.bin')).arrayBuffer()
     MERKLE_TREE_HEIGHT = 16
     ETH_AMOUNT = 1e18
+    TOKEN_AMOUNT = 1e19
   } else {
     // Initialize from local node
     web3 = new Web3('http://localhost:8545', null, { transactionConfirmationBlocks: 1 })
@@ -242,6 +291,7 @@ async function init() {
     require('dotenv').config()
     MERKLE_TREE_HEIGHT = process.env.MERKLE_TREE_HEIGHT
     ETH_AMOUNT = process.env.ETH_AMOUNT
+    TOKEN_AMOUNT = process.env.TOKEN_AMOUNT
     ERC20_TOKEN = process.env.ERC20_TOKEN
     erc20ContractJson = require('./build/contracts/ERC20Mock.json')
     erc20mixerJson = require('./build/contracts/ERC20Mixer.json')
@@ -263,22 +313,31 @@ async function init() {
     const tx2 = await web3.eth.getTransaction(erc20ContractJson.networks[netId].transactionHash)
     erc20.deployedBlock = tx2.blockNumber
   }
+
+  senderAccount = (await web3.eth.getAccounts())[0]
   console.log('Loaded')
 }
 
 // ========== CLI related stuff below ==============
 
+/** Print command line help */
 function printHelp(code = 0) {
   console.log(`Usage:
   Submit a deposit from default eth account and return the resulting note
   $ ./cli.js deposit
+  $ ./cli.js depositErc20
 
   Withdraw a note to 'recipient' account
-  $ ./cli.js withdraw <note> <recipient>
+  $ ./cli.js withdraw <note> <recipient> [relayUrl]
+  $ ./cli.js withdrawErc20 <note> <recipient> [relayUrl]
 
   Check address balance
   $ ./cli.js balance <address>
   
+  Perform an automated test
+  $ ./cli.js test
+  $ ./cli.js testRelay
+
 Example:
   $ ./cli.js deposit
   ...
@@ -289,75 +348,99 @@ Example:
   process.exit(code)
 }
 
-if (inBrowser) {
+/** Process command line args and run */
-  window.deposit = deposit
+async function runConsole(args) {
-  window.withdraw = async () => {
-    const note = prompt('Enter the note to withdraw')
-    const recipient = (await web3.eth.getAccounts())[0]
-    await withdraw(note, recipient)
-  }
-  init()
-} else {
-  const args = process.argv.slice(2)
   if (args.length === 0) {
     printHelp()
   } else {
     switch (args[0]) {
     case 'deposit':
       if (args.length === 1) {
-        init().then(() => deposit()).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+        await init()
-      }
+        await printBalance(mixer._address, 'Mixer')
-      else
+        await printBalance(senderAccount, 'Sender account')
+        await deposit()
+        await printBalance(mixer._address, 'Mixer')
+        await printBalance(senderAccount, 'Sender account')
+      } else {
         printHelp(1)
+      }
       break
     case 'depositErc20':
       if (args.length === 1) {
-        init().then(() => depositErc20()).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+        await init()
-      }
+        await printBalance(erc20mixer._address, 'Mixer')
-      else
+        await printBalance(senderAccount, 'Sender account')
+        await depositErc20()
+        await printBalance(erc20mixer._address, 'Mixer')
+        await printBalance(senderAccount, 'Sender account')
+      } else {
         printHelp(1)
+      }
       break
     case 'balance':
       if (args.length === 2 && /^0x[0-9a-fA-F]{40}$/.test(args[1])) {
-        init().then(() => getBalance(args[1])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+        await init()
-      } else
+        await printBalance(args[1])
-        printHelp(1)
+      } else {
-      break
-    case 'balanceErc20':
-      if (args.length === 3 && /^0x[0-9a-fA-F]{40}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
-        init().then(() => getBalanceErc20(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
-      } else
         printHelp(1)
+      }
       break
     case 'withdraw':
-      if (args.length === 3 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
+      if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
-        init().then(() => withdraw(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+        await init()
-      }
+        await printBalance(mixer._address, 'Mixer')
-      else
+        await printBalance(args[2], 'Recipient account')
+        if (args[3]) {
+          await withdrawRelay(args[1], args[2], args[3])
+        } else {
+          await withdraw(args[1], args[2])
+        }
+        await printBalance(mixer._address, 'Mixer')
+        await printBalance(args[2], 'Recipient account')
+      } else {
         printHelp(1)
+      }
       break
     case 'withdrawErc20':
-      if (args.length === 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2]) && /^0x[0-9a-fA-F]{40}$/.test(args[3])) {
+      if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
-        init().then(() => withdrawErc20(args[1], args[2], args[3])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+        await init()
-      }
+        await printBalance(erc20mixer._address, 'Mixer')
-      else
+        await printBalance(args[2], 'Recipient account')
+        if (args[3]) {
+          await withdrawRelayErc20(args[1], args[2], args[3])
+        } else {
+          await withdrawErc20(args[1], args[2])
+        }
+        await printBalance(erc20mixer._address, 'Mixer')
+        await printBalance(args[2], 'Recipient account')
+      } else {
         printHelp(1)
+      }
       break
     case 'test':
       if (args.length === 1) {
-        (async () => {
+        await init()
-          await init()
+        const note1 = await deposit()
-          const account = (await web3.eth.getAccounts())[0]
+        await withdraw(note1, senderAccount)
-          const note = await deposit()
-          await withdraw(note, account)
 
-          const note2 = await deposit()
+        const note2 = await depositErc20()
-          await withdraw(note2, account, account)
+        await withdrawErc20(note2, senderAccount)
-          process.exit(0)
+      } else {
-        })()
-      }
-      else
         printHelp(1)
+      }
+      break
+    case 'testRelay':
+      if (args.length === 1) {
+        await init()
+        const note1 = await deposit()
+        await withdrawRelay(note1, senderAccount, 'http://localhost:8000')
+
+        const note2 = await depositErc20()
+        await withdrawRelayErc20(note2, senderAccount, 'http://localhost:8000')
+      } else {
+        printHelp(1)
+      }
       break
 
     default:
@@ -365,3 +448,18 @@ if (inBrowser) {
     }
   }
 }
+
+if (inBrowser) {
+  window.deposit = deposit
+  window.depositErc20 = depositErc20
+  window.withdraw = async () => {
+    const note = prompt('Enter the note to withdraw')
+    const recipient = (await web3.eth.getAccounts())[0]
+    await withdraw(note, recipient)
+  }
+  init()
+} else {
+  runConsole(process.argv.slice(2))
+    .then(() => process.exit(0))
+    .catch(err => { console.log(err); process.exit(1) })
+}

package-lock.json

@@ -488,6 +488,22 @@
       "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
       "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ=="
     },
+    "axios": {
+      "version": "0.19.0",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.19.0.tgz",
+      "integrity": "sha512-1uvKqKQta3KBxIz14F2v06AEHZ/dIoeKfbTRkK1E5oqjDnuEerLmYTgJB5AiQZHJcljpg1TuRzdjDR06qNk0DQ==",
+      "requires": {
+        "follow-redirects": "1.5.10",
+        "is-buffer": "^2.0.2"
+      },
+      "dependencies": {
+        "is-buffer": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A=="
+        }
+      }
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -3504,6 +3520,29 @@
       "resolved": "https://registry.npmjs.org/flatted/-/flatted-2.0.1.tgz",
       "integrity": "sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg=="
     },
+    "follow-redirects": {
+      "version": "1.5.10",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
+      "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
+      "requires": {
+        "debug": "=3.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+          "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+        }
+      }
+    },
     "for-each": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.3.tgz",

package.json

@@ -30,6 +30,7 @@
     "@truffle/artifactor": "^4.0.38",
     "@truffle/contract": "^4.0.39",
     "@truffle/hdwallet-provider": "^1.0.24",
+    "axios": "^0.19.0",
     "bn-chai": "^1.0.1",
     "browserify": "^16.5.0",
     "chai": "^4.2.0",