diff --git a/.gitignore b/.gitignore
index 135f8a8..81c6bfb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -96,3 +96,6 @@ typings/
ERC20Mixer_flat.sol
ETHMixer_flat.sol
+
+.openzeppelin/.session
+.openzeppelin/dev-*.json
diff --git a/cli.js b/cli.js
index e2e9c2b..e77e5fa 100755
--- a/cli.js
+++ b/cli.js
@@ -11,6 +11,8 @@ const merkleTree = require('./lib/MerkleTree')
const Web3 = require('web3')
const buildGroth16 = require('websnark/src/groth16')
const websnarkUtils = require('websnark/src/utils')
+const { GSNProvider, GSNDevProvider } = require('@openzeppelin/gsn-provider')
+const { ephemeral } = require('@openzeppelin/network')
let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20
let MERKLE_TREE_HEIGHT, ETH_AMOUNT, EMPTY_ELEMENT, ERC20_TOKEN
@@ -29,6 +31,7 @@ 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(nullifier.leInt2Buff(31))
return deposit
}
@@ -38,9 +41,10 @@ function createDeposit(nullifier, secret) {
*/
async function deposit() {
const deposit = createDeposit(rbigint(31), rbigint(31))
+ const fromAccount = (await web3.eth.getAccounts())[0]
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('0x' + deposit.commitment.toString(16)).send({ value: ETH_AMOUNT, from: fromAccount, gas:1e6 })
const note = '0x' + deposit.preimage.toString('hex')
console.log('Your note:', note)
@@ -48,19 +52,21 @@ async function deposit() {
}
async function depositErc20() {
- const account = (await web3.eth.getAccounts())[0]
+ const fromAccount = (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()
+ await erc20.methods.mint(fromAccount, tokenAmount).send({ from: fromAccount, gas:1e6 })
+
+ await erc20.methods.approve(erc20mixer.address, tokenAmount).send({ from: fromAccount, gas:1e6 })
+ const allowance = await erc20.methods.allowance(fromAccount, 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 })
+ await erc20mixer.methods.deposit('0x' + deposit.commitment.toString(16)).send({ from: fromAccount, gas:1e6 })
const balance = await erc20.methods.balanceOf(erc20mixer.address).call()
console.log('erc20mixer balance', balance.toString(10))
+
const note = '0x' + deposit.preimage.toString('hex')
console.log('Your note:', note)
return note
@@ -196,6 +202,92 @@ async function withdraw(note, receiver) {
console.log('Done')
}
+async function buildDepositTree() {
+ // 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 leaves = events
+ .sort((a, b) => a.returnValues.leafIndex.sub(b.returnValues.leafIndex)) // Sort events in chronological order
+ .map(e => e.returnValues.commitment)
+ const tree = new merkleTree(MERKLE_TREE_HEIGHT, EMPTY_ELEMENT, leaves)
+}
+
+async function withdrawViaRelayer(note, receiver) {
+ // 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 leaves = events
+ .sort((a, b) => a.returnValues.leafIndex.sub(b.returnValues.leafIndex)) // Sort events in chronological order
+ .map(e => e.returnValues.commitment)
+ const tree = new merkleTree(MERKLE_TREE_HEIGHT, EMPTY_ELEMENT, leaves)
+
+ // Find current commitment in the tree
+ let depositEvent = events.find(e => e.returnValues.commitment.eq(paddedCommitment))
+ let leafIndex = depositEvent ? depositEvent.returnValues.leafIndex.toNumber() : -1
+
+ // Validate that our data is correct
+ const isValidRoot = await mixer.methods.isKnownRoot(await tree.root()).call()
+ const isSpent = await mixer.methods.isSpent(paddedNullifierHash).call()
+ assert(isValidRoot === true, 'Merkle tree assembled incorrectly') // Merkle tree assembled correctly
+ assert(isSpent === false, 'The note is spent') // The note is not spent
+ assert(leafIndex >= 0, 'Our deposit is not present in the tree') // Our deposit is present in the tree
+
+ // Compute merkle proof of our commitment
+ const { root, path_elements, path_index } = await tree.path(leafIndex)
+
+ // Prepare circuit input
+ const input = {
+ // Public snark inputs
+ root: root,
+ nullifierHash,
+ receiver: bigInt(receiver),
+ relayer: bigInt(0),
+ fee: bigInt(web3.utils.toWei('0.01')),
+ refund: bigInt(0),
+
+ // Private snark inputs
+ nullifier: deposit.nullifier,
+ secret: deposit.secret,
+ pathElements: path_elements,
+ pathIndex: path_index,
+ }
+
+ console.log('Generating SNARK proof')
+ console.time('Proof time')
+ const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
+ const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
+ console.timeEnd('Proof time')
+
+ console.log('Submitting withdraw transaction via relayer')
+
+ const account = ephemeral()
+ const HARDCODED_RELAYER_OPTS = {
+ txFee: 90,
+ fixedGasPrice: 22000000001,
+ gasPrice: 22000000001,
+ fixedGasLimit: 5000000,
+ gasLimit: 5000000,
+ verbose: true,
+ }
+ const provider = new GSNProvider('https://rinkeby.infura.io/v3/c7463beadf2144e68646ff049917b716', { signKey: account })
+ // const provider = new GSNDevProvider('http://localhost:8545', { signKey: account, HARDCODED_RELAYER_OPTS })
+ web3 = new Web3(provider)
+ const netId = await web3.eth.net.getId()
+ console.log('netId', netId)
+ // eslint-disable-next-line require-atomic-updates
+ mixer = new web3.eth.Contract(contractJson.abi, contractJson.networks[netId].address)
+ console.log('mixer address', contractJson.networks[netId].address)
+ const tx = await mixer.methods.withdrawViaRelayer(proof, publicSignals).send({ from: account.address, gas: 2e6 })
+ console.log('tx', tx)
+ console.log('Done')
+}
/**
* Init web3, contracts, and snark
*/
@@ -275,6 +367,11 @@ if (inBrowser) {
const receiver = (await web3.eth.getAccounts())[0]
await withdraw(note, receiver)
}
+ window.withdrawViaRelayer = async () => {
+ const note = prompt('Enter the note to withdrawViaRelayer')
+ const receiver = (await web3.eth.getAccounts())[0]
+ await withdrawViaRelayer(note, receiver)
+ }
init()
} else {
const args = process.argv.slice(2)
@@ -322,6 +419,13 @@ if (inBrowser) {
else
printHelp(1)
break
+ case 'withdrawViaRelayer':
+ if (args.length === 3 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
+ init().then(() => withdrawViaRelayer(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)})
+ }
+ else
+ printHelp(1)
+ break
case 'test':
if (args.length === 1) {
(async () => {
diff --git a/contracts/GSNProxy.sol b/contracts/GSNProxy.sol
new file mode 100644
index 0000000..26c62ec
--- /dev/null
+++ b/contracts/GSNProxy.sol
@@ -0,0 +1,157 @@
+pragma solidity ^0.5.8;
+// contract we {}
+
+import "./IUniswapExchange.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts-ethereum-package/contracts/GSN/GSNRecipient.sol";
+import "@openzeppelin/contracts-ethereum-package/contracts/GSN/IRelayHub.sol";
+import "@openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol";
+
+contract IMixer {
+ function withdraw(uint256[8] calldata proof, uint256[6] calldata input) external payable;
+ function checkWithdrawalValidity(uint256[8] calldata proof, uint256[6] calldata input) external view;
+ function denomination() external view returns(uint256);
+ function token() external view returns(address); // only for ERC20 version
+}
+
+contract GSNProxy is GSNRecipient, Ownable {
+ IMixer public mixer;
+ IUniswapExchange public uniswap;
+ IERC20 public token;
+
+ constructor(address _mixer, address _uniswap) public {
+ mixer = IMixer(_mixer);
+ if (_uniswap != address(0)) {
+ uniswap = IUniswapExchange(_uniswap);
+ require(mixer.token() == uniswap.tokenAddress(), "mixer and uniswap have different tokens");
+ token = IERC20(uniswap.tokenAddress());
+ } else {
+ // todo: require that mixer is ETH version?
+ }
+ }
+
+ // Allow to refill mixer balance
+ function () external payable {}
+
+ modifier onlyHub() {
+ require(msg.sender == getHubAddr(), "only relay hub");
+ _;
+ }
+
+ /**
+ @dev Checks fee and calls mixer withdraw
+ */
+ function withdraw(uint256[8] calldata proof, uint256[6] calldata input) external {
+ mixer.withdraw.value(refund)(proof, input);
+ // todo: check that we received expected fee?
+ }
+
+ // gsn related stuff
+ // this func is called by a Relayer via the RelayerHub before sending a tx
+ function acceptRelayedCall(
+ address /*relay*/,
+ address /*from*/,
+ bytes memory encodedFunction,
+ uint256 /*transactionFee*/,
+ uint256 /*gasPrice*/,
+ uint256 /*gasLimit*/,
+ uint256 /*nonce*/,
+ bytes memory /*approvalData*/,
+ uint256 maxPossibleCharge
+ ) public view returns (uint256, bytes memory) {
+ // think of a withdraw dry-run
+ if (!compareBytesWithSelector(encodedFunction, this.withdraw.selector)) {
+ return (1, "Only withdrawViaRelayer can be called");
+ }
+
+ bytes memory proof;
+ bytes memory root;
+ uint256 fee;
+ uint256 refund;
+ assembly {
+ let dataPointer := add(encodedFunction, 32)
+ let nullifierPointer := mload(add(dataPointer, 4)) // 4 + (8 * 32) + (32) == selector + proof + root
+ let recipientPointer := mload(add(dataPointer, 324)) // 4 + (8 * 32) + (32) + (32) == selector + proof + root + nullifier
+ mstore(recipient, 64) // save array length
+ mstore(add(recipient, 32), recipientPointer) // save recipient address
+ mstore(add(recipient, 64), nullifierPointer) // save nullifier address
+ }
+ //mixer.checkWithdrawalValidity(proof, inputs)
+ // todo: duplicate withdraw checks?
+
+ if (token != IERC20(0)) {
+ // todo maybe static exchange rate?
+ if (uniswap.getTokenToEthInputPrice(fee) < maxPossibleCharge + refund) {
+ return (11, "Fee is too low");
+ }
+ } else {
+ // refund is expected to be 0, checked by mixer contract
+ if (fee < maxPossibleCharge + refund) {
+ return (11, "Fee is too low");
+ }
+ }
+
+ if (mixer.checkWithdrawalValidity()) {
+
+ }
+
+ return _approveRelayedCall();
+ }
+
+ // this func is called by RelayerHub right before calling a target func
+ function preRelayedCall(bytes calldata /*context*/) onlyHub external returns (bytes32) {}
+ function postRelayedCall(bytes memory /*context*/, bool /*success*/, uint actualCharge, bytes32 /*preRetVal*/) onlyHub public {
+ IRelayHub(getHubAddr()).depositFor.value(actualCharge)(address(this));
+ }
+
+ function compareBytesWithSelector(bytes memory data, bytes4 sel) internal pure returns (bool) {
+ return data[0] == sel[0]
+ && data[1] == sel[1]
+ && data[2] == sel[2]
+ && data[3] == sel[3];
+ }
+
+ // Admin functions
+
+ function withdrawFundsFromHub(uint256 amount, address payable dest) onlyOwner external {
+ IRelayHub(getHubAddr()).withdraw(amount, dest);
+ }
+
+ function upgradeRelayHub(address newRelayHub) onlyOwner external {
+ _upgradeRelayHub(newRelayHub);
+ }
+
+ function withdrawEther(uint256 amount) onlyOwner external {
+ msg.sender.transfer(amount);
+ }
+
+ function withdrawTokens(uint256 amount) onlyOwner external {
+ safeErc20Transfer(msg.sender, amount);
+ }
+
+ function sellTokens(uint256 amount, uint256 min_eth) onlyOwner external {
+ token.approve(address(uniswap), amount);
+ uniswap.tokenToEthSwapInput(amount, min_eth, now);
+ }
+
+ function safeErc20Transfer(address to, uint256 amount) internal {
+ bool success;
+ bytes memory data;
+ bytes4 transferSelector = 0xa9059cbb;
+ (success, data) = address(token).call(
+ abi.encodeWithSelector(
+ transferSelector,
+ to, amount
+ )
+ );
+ require(success, "not enough tokens");
+
+ // if contract returns some data let's make sure that is `true` according to standard
+ if (data.length > 0) {
+ assembly {
+ success := mload(add(data, 0x20))
+ }
+ require(success, "not enough tokens. Token returns false.");
+ }
+ }
+}
diff --git a/contracts/IUniswapExchange.sol b/contracts/IUniswapExchange.sol
new file mode 100644
index 0000000..f47b913
--- /dev/null
+++ b/contracts/IUniswapExchange.sol
@@ -0,0 +1,70 @@
+pragma solidity ^0.5.0;
+
+contract IUniswapExchange {
+ // Address of ERC20 token sold on this exchange
+ function tokenAddress() external view returns (address token) {}
+ // Address of Uniswap Factory
+ function factoryAddress() external view returns (address factory) {}
+ // Provide Liquidity
+ function addLiquidity(uint256 min_liquidity, uint256 max_tokens, uint256 deadline) external payable returns (uint256) {}
+
+ function removeLiquidity(uint256 amount, uint256 min_eth, uint256 min_tokens, uint256 deadline) external returns (uint256, uint256) {}
+ // Get Prices
+ function getEthToTokenInputPrice(uint256 eth_sold) external view returns (uint256 tokens_bought) {}
+
+ function getEthToTokenOutputPrice(uint256 tokens_bought) external view returns (uint256 eth_sold) {}
+
+ function getTokenToEthInputPrice(uint256 tokens_sold) external view returns (uint256 eth_bought) {}
+
+ function getTokenToEthOutputPrice(uint256 eth_bought) external view returns (uint256 tokens_sold) {}
+ // Trade ETH to ERC20
+ function ethToTokenSwapInput(uint256 min_tokens, uint256 deadline) external payable returns (uint256 tokens_bought) {}
+
+ function ethToTokenTransferInput(uint256 min_tokens, uint256 deadline, address recipient) external payable returns (uint256 tokens_bought) {}
+
+ function ethToTokenSwapOutput(uint256 tokens_bought, uint256 deadline) external payable returns (uint256 eth_sold) {}
+
+ function ethToTokenTransferOutput(uint256 tokens_bought, uint256 deadline, address recipient) external payable returns (uint256 eth_sold) {}
+ // Trade ERC20 to ETH
+ function tokenToEthSwapInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline) external returns (uint256 eth_bought) {}
+
+ function tokenToEthTransferInput(uint256 tokens_sold, uint256 min_eth, uint256 deadline, address recipient) external returns (uint256 eth_bought) {}
+
+ function tokenToEthSwapOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline) external returns (uint256 tokens_sold) {}
+
+ function tokenToEthTransferOutput(uint256 eth_bought, uint256 max_tokens, uint256 deadline, address recipient) external returns (uint256 tokens_sold) {}
+ // Trade ERC20 to ERC20
+ function tokenToTokenSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address token_addr) external returns (uint256 tokens_bought) {}
+
+ function tokenToTokenTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address token_addr) external returns (uint256 tokens_bought) {}
+
+ function tokenToTokenSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address token_addr) external returns (uint256 tokens_sold) {}
+
+ function tokenToTokenTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address token_addr) external returns (uint256 tokens_sold) {}
+ // Trade ERC20 to Custom Pool
+ function tokenToExchangeSwapInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address exchange_addr) external returns (uint256 tokens_bought) {}
+
+ function tokenToExchangeTransferInput(uint256 tokens_sold, uint256 min_tokens_bought, uint256 min_eth_bought, uint256 deadline, address recipient, address exchange_addr) external returns (uint256 tokens_bought) {}
+
+ function tokenToExchangeSwapOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address exchange_addr) external returns (uint256 tokens_sold) {}
+
+ function tokenToExchangeTransferOutput(uint256 tokens_bought, uint256 max_tokens_sold, uint256 max_eth_sold, uint256 deadline, address recipient, address exchange_addr) external returns (uint256 tokens_sold) {}
+ // ERC20 comaptibility for liquidity tokens
+ bytes32 public name;
+ bytes32 public symbol;
+ uint256 public decimals;
+
+ function transfer(address _to, uint256 _value) external returns (bool) {}
+
+ function transferFrom(address _from, address _to, uint256 value) external returns (bool) {}
+
+ function approve(address _spender, uint256 _value) external returns (bool) {}
+
+ function allowance(address _owner, address _spender) external view returns (uint256) {}
+
+ function balanceOf(address _owner) external view returns (uint256) {}
+
+ function totalSupply() external view returns (uint256) {}
+ // Never use
+ function setup(address token_addr) external {}
+}
diff --git a/contracts/Mixer.sol b/contracts/Mixer.sol
index 1845dcc..14c0919 100644
--- a/contracts/Mixer.sol
+++ b/contracts/Mixer.sol
@@ -90,16 +90,34 @@ contract Mixer is MerkleTreeWithHistory {
address payable relayer = address(input[3]);
uint256 fee = input[4];
uint256 refund = input[5];
+
require(fee < denomination, "Fee exceeds transfer value");
require(!nullifierHashes[nullifierHash], "The note has been already spent");
-
require(isKnownRoot(root), "Cannot find your merkle root"); // Make sure to use a recent one
require(verifier.verifyProof(proof, input), "Invalid withdraw proof");
+
nullifierHashes[nullifierHash] = true;
_processWithdraw(receiver, relayer, fee, refund);
emit Withdraw(receiver, nullifierHash, relayer, fee);
}
+ // todo: use this function in withdraw?
+ /**
+ @dev same checks as `withdraw` implemented as a view function. Used for relayers.
+ */
+ function checkWithdrawalValidity(uint256[8] calldata proof, uint256[6] calldata input) external view {
+ uint256 root = input[0];
+ uint256 nullifierHash = input[1];
+ //address payable receiver = address(input[2]);
+ //address payable relayer = address(input[3]);
+ uint256 fee = input[4];
+ uint256 refund = input[5];
+ require(fee < denomination, "Fee exceeds transfer value");
+ require(!nullifierHashes[nullifierHash], "The note has been already spent");
+ require(isKnownRoot(root), "Cannot find your merkle root"); // Make sure to use a recent one
+ require(verifier.verifyProof(proof, input), "Invalid withdraw proof");
+ }
+
/** @dev this function is defined in a child contract */
function _processWithdraw(address payable _receiver, address payable _relayer, uint256 _fee, uint256 _refund) internal {}
diff --git a/contracts/Mocks/UniswapMock.sol b/contracts/Mocks/UniswapMock.sol
new file mode 100644
index 0000000..f2670aa
--- /dev/null
+++ b/contracts/Mocks/UniswapMock.sol
@@ -0,0 +1,67 @@
+pragma solidity ^0.5.0;
+
+import "./ERC20Mock.sol";
+import "../IUniswapExchange.sol";
+
+contract UniswapMock is IUniswapExchange {
+
+ ERC20Mock public tokenAddress;
+ uint256 public price;
+
+ // EthPurchase: event({buyer: indexed(address), tokens_sold: indexed(uint256), eth_bought: indexed(uint256(wei))})
+ event EthPurchase(address buyer, uint256 tokens_sold, uint256 eth_bought);
+
+ constructor(ERC20Mock _token, uint256 _price) public payable {
+ tokenAddress = _token;
+ price = _price; // in wei
+ }
+
+
+ /*
+ * @notice Convert Tokens to ETH.
+ * @dev User specifies maximum input and exact output.
+ * @param eth_bought Amount of ETH purchased.
+ * @param max_tokens Maximum Tokens sold.
+ * @param deadline Time after which this transaction can no longer be executed.
+ * @return Amount of Tokens sold.
+ * @public
+ * def tokenToEthSwapOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp) -> uint256:
+ */
+ function tokenToEthSwapOutput(uint256 eth_bought, uint256 /*max_tokens*/, uint256 /*deadline*/) public returns(uint256 tokens_sold) {
+ tokens_sold = getTokenToEthOutputPrice(eth_bought);
+ tokenAddress.transferFrom(msg.sender, address(this), tokens_sold);
+ msg.sender.transfer(eth_bought);
+ emit EthPurchase(msg.sender, tokens_sold, eth_bought);
+ return eth_bought;
+ }
+
+ function getTokenToEthOutputPrice(uint256 eth_bought) public view returns (uint256) {
+ return eth_bought * price / 10**18;
+ }
+
+ /*
+ * @notice Convert Tokens to ETH.
+ * @dev User specifies exact input and minimum output.
+ * @param tokens_sold Amount of Tokens sold.
+ * @param min_eth Minimum ETH purchased.
+ * @param deadline Time after which this transaction can no longer be executed.
+ * @return Amount of ETH bought.
+ * def tokenToEthSwapInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp) -> uint256(wei):
+ */
+ function tokenToEthSwapInput(uint256 tokens_sold, uint256 /* min_eth */, uint256 /* deadline */) public returns(uint256) {
+ tokenAddress.transferFrom(msg.sender, address(this), tokens_sold);
+ uint256 eth_bought = getTokenToEthInputPrice(tokens_sold);
+ msg.sender.transfer(eth_bought);
+ return eth_bought;
+ }
+
+ function getTokenToEthInputPrice(uint256 tokens_sold /* in wei */) public view returns (uint256 eth_bought) {
+ return tokens_sold * price / 10**18;
+ }
+
+ function setPrice(uint256 _price) external {
+ price = _price;
+ }
+
+ function() external payable {}
+}
diff --git a/index.html b/index.html
index 359c20b..1d78b83 100644
--- a/index.html
+++ b/index.html
@@ -10,6 +10,7 @@
Make sure your Metamask is unlocked and connected to Kovan (or other network you've deployed your contract to)
Deposit
Withdraw
+ withdrawViaRelayer
diff --git a/migrations/5_deploy_eth_mixer_proxy.js b/migrations/5_deploy_eth_mixer_proxy.js
new file mode 100644
index 0000000..d42858b
--- /dev/null
+++ b/migrations/5_deploy_eth_mixer_proxy.js
@@ -0,0 +1,16 @@
+/* global artifacts */
+require('dotenv').config({ path: '../.env' })
+const ETHMixer = artifacts.require('ETHMixer')
+const gsnProxy = artifacts.require('GSNProxy')
+
+module.exports = function(deployer) {
+ return deployer.then(async () => {
+ let mixer = await ETHMixer.deployed()
+ const proxy = await deployer.deploy(
+ gsnProxy,
+ mixer.address,
+ '0x0000000000000000000000000000000000000000',
+ )
+ console.log('Mixer\'s proxy address ', proxy.address)
+ })
+}
diff --git a/migrations/5_deploy_erc20_mixer.js b/migrations/6_deploy_erc20_mixer.js
similarity index 100%
rename from migrations/5_deploy_erc20_mixer.js
rename to migrations/6_deploy_erc20_mixer.js
diff --git a/migrations/7_deploy_erc20_mixer_proxy.js b/migrations/7_deploy_erc20_mixer_proxy.js
new file mode 100644
index 0000000..c2dddcc
--- /dev/null
+++ b/migrations/7_deploy_erc20_mixer_proxy.js
@@ -0,0 +1,32 @@
+/* global artifacts */
+require('dotenv').config({ path: '../.env' })
+const ERC20Mixer = artifacts.require('ERC20Mixer')
+const gsnProxy = artifacts.require('GSNProxy')
+const ERC20Mock = artifacts.require('ERC20Mock')
+const UniswapMock = artifacts.require('UniswapMock')
+const { toBN, toWei } = require('web3-utils')
+const eth2daiPrice = toBN('174552286079977583324') // cause 1 ETH == 174.55 DAI
+
+
+module.exports = function(deployer, network) {
+ return deployer.then(async () => {
+ const { ERC20_TOKEN } = process.env
+ let token = ERC20_TOKEN
+ let uniswapAddress
+ if (network === 'development') { // means we want to test with mock
+ if (token === '') {
+ const tokenInstance = await ERC20Mock.deployed()
+ token = tokenInstance.address
+ }
+ const uniswap = await deployer.deploy(UniswapMock, token, eth2daiPrice, { value: toWei('0.5') })
+ uniswapAddress = uniswap.address
+ }
+ let mixer = await ERC20Mixer.deployed()
+ const proxy = await deployer.deploy(
+ gsnProxy,
+ mixer.address,
+ uniswapAddress,
+ )
+ console.log('ERC20Mixer\'s proxy address ', proxy.address)
+ })
+}
diff --git a/package-lock.json b/package-lock.json
index 15250c9..ecde65e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,6 +35,2992 @@
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},
+ "@openzeppelin/contracts-ethereum-package": {
+ "version": "2.3.0",
+ "resolved": "https://registry.npmjs.org/@openzeppelin/contracts-ethereum-package/-/contracts-ethereum-package-2.3.0.tgz",
+ "integrity": "sha512-voAH5uPmfZ0bpMHV6JgXoaWqkp0YIMmAino04nvJWso4S9di/rrWr8nnJB+b5bwQEz06u1rN9O3nXM9vIiHBlw==",
+ "dev": true
+ },
+ "@openzeppelin/gsn-helpers": {
+ "version": "0.2.1",
+ "resolved": "https://registry.npmjs.org/@openzeppelin/gsn-helpers/-/gsn-helpers-0.2.1.tgz",
+ "integrity": "sha512-EJra2VRQENhze5nHY1iBvPKHMuAmQU0i94EMbJBxiVCtmMzvrESb8r/nL2A6hkyoU/se/VQ4w9KVT28gv02EtQ==",
+ "dev": true,
+ "requires": {
+ "axios": "^0.19.0",
+ "chai": "^4.2.0",
+ "commander": "^2.20.0",
+ "env-paths": "^2.2.0",
+ "fs-extra": "^8.1.0",
+ "lodash": "^4.17.15",
+ "sleep-promise": "^8.0.1",
+ "tmp": "^0.1.0",
+ "web3": "^1.2.1"
+ },
+ "dependencies": {
+ "@types/node": {
+ "version": "12.11.7",
+ "resolved": "https://registry.npmjs.org/@types/node/-/node-12.11.7.tgz",
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+ "dev": true
+ },
+ "commander": {
+ "version": "2.20.3",
+ "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+ "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+ "dev": true
+ },
+ "debug": {
+ "version": "2.6.9",
+ "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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+ "dev": true,
+ "requires": {
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+ },
+ "eth-lib": {
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+ "dev": true,
+ "requires": {
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+ "dev": true,
+ "requires": {
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+ }
+ },
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+ "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+ "dev": true
+ }
+ }
+ },
"for-each": {
"version": "0.3.3",
"resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.3.tgz",
@@ -4499,6 +8029,17 @@
"minimalistic-assert": "^1.0.1"
}
},
+ "hdkey": {
+ "version": "1.1.1",
+ "resolved": "https://registry.npmjs.org/hdkey/-/hdkey-1.1.1.tgz",
+ "integrity": "sha512-DvHZ5OuavsfWs5yfVJZestsnc3wzPvLWNk6c2nRUfo6X+OtxypGt20vDDf7Ba+MJzjL3KS1og2nw2eBbLCOUTA==",
+ "dev": true,
+ "requires": {
+ "coinstring": "^2.0.0",
+ "safe-buffer": "^5.1.1",
+ "secp256k1": "^3.0.1"
+ }
+ },
"he": {
"version": "1.1.1",
"resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
@@ -5205,6 +8746,15 @@
"resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
"integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus="
},
+ "json-text-sequence": {
+ "version": "0.1.1",
+ "resolved": "https://registry.npmjs.org/json-text-sequence/-/json-text-sequence-0.1.1.tgz",
+ "integrity": "sha1-py8hfcSvxGKf/1/rME3BvVGi89I=",
+ "dev": true,
+ "requires": {
+ "delimit-stream": "0.1.0"
+ }
+ },
"json5": {
"version": "2.1.0",
"resolved": "https://registry.npmjs.org/json5/-/json5-2.1.0.tgz",
@@ -5408,11 +8958,137 @@
"resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
"integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw=="
},
+ "lodash.concat": {
+ "version": "4.5.0",
+ "resolved": "https://registry.npmjs.org/lodash.concat/-/lodash.concat-4.5.0.tgz",
+ "integrity": "sha1-sFOuAuSoAIWC5yVrnQK9ptA4A5U=",
+ "dev": true
+ },
+ "lodash.difference": {
+ "version": "4.5.0",
+ "resolved": "https://registry.npmjs.org/lodash.difference/-/lodash.difference-4.5.0.tgz",
+ "integrity": "sha1-nMtOUF1Ia5FlE0V3KIWi3yf9AXw=",
+ "dev": true
+ },
+ "lodash.every": {
+ "version": "4.6.0",
+ "resolved": "https://registry.npmjs.org/lodash.every/-/lodash.every-4.6.0.tgz",
+ "integrity": "sha1-64mYS+vENkJ5uzrvu9HKGb+mxqc=",
+ "dev": true
+ },
+ "lodash.findlast": {
+ "version": "4.6.0",
+ "resolved": "https://registry.npmjs.org/lodash.findlast/-/lodash.findlast-4.6.0.tgz",
+ "integrity": "sha1-6ou3jPLn54BPyK630ZU+B/4x+8g=",
+ "dev": true
+ },
+ "lodash.flatten": {
+ "version": "4.4.0",
+ "resolved": "https://registry.npmjs.org/lodash.flatten/-/lodash.flatten-4.4.0.tgz",
+ "integrity": "sha1-8xwiIlqWMtK7+OSt2+8kCqdlph8=",
+ "dev": true
+ },
+ "lodash.includes": {
+ "version": "4.3.0",
+ "resolved": "https://registry.npmjs.org/lodash.includes/-/lodash.includes-4.3.0.tgz",
+ "integrity": "sha1-YLuYqHy5I8aMoeUTJUgzFISfVT8=",
+ "dev": true
+ },
+ "lodash.invertby": {
+ "version": "4.7.0",
+ "resolved": "https://registry.npmjs.org/lodash.invertby/-/lodash.invertby-4.7.0.tgz",
+ "integrity": "sha1-zeu2zUlCqmuN8sdL4cXZSGgnGLA=",
+ "dev": true
+ },
+ "lodash.isempty": {
+ "version": "4.4.0",
+ "resolved": "https://registry.npmjs.org/lodash.isempty/-/lodash.isempty-4.4.0.tgz",
+ "integrity": "sha1-b4bL7di+TsmHvpqvM8loTbGzHn4=",
+ "dev": true
+ },
+ "lodash.isequal": {
+ "version": "4.5.0",
+ "resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
+ "integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA=",
+ "dev": true
+ },
+ "lodash.isstring": {
+ "version": "4.0.1",
+ "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
+ "integrity": "sha1-1SfftUVuynzJu5XV2ur4i6VKVFE=",
+ "dev": true
+ },
+ "lodash.keys": {
+ "version": "4.2.0",
+ "resolved": "https://registry.npmjs.org/lodash.keys/-/lodash.keys-4.2.0.tgz",
+ "integrity": "sha1-oIYCrBLk+4P5H8H7ejYKTZujUgU=",
+ "dev": true
+ },
+ "lodash.map": {
+ "version": "4.6.0",
+ "resolved": "https://registry.npmjs.org/lodash.map/-/lodash.map-4.6.0.tgz",
+ "integrity": "sha1-dx7Hg540c9nEzeKLGTlMNWL09tM=",
+ "dev": true
+ },
"lodash.memoize": {
"version": "3.0.4",
"resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-3.0.4.tgz",
"integrity": "sha1-LcvSwofLwKVcxCMovQxzYVDVPj8="
},
+ "lodash.omit": {
+ "version": "4.5.0",
+ "resolved": "https://registry.npmjs.org/lodash.omit/-/lodash.omit-4.5.0.tgz",
+ "integrity": "sha1-brGa5aHuHdnfC5aeZs4Lf6MLXmA=",
+ "dev": true
+ },
+ "lodash.pick": {
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+ "resolved": "https://registry.npmjs.org/lodash.pick/-/lodash.pick-4.4.0.tgz",
+ "integrity": "sha1-UvBWEP/53tQiYRRB7R/BI6AwAbM=",
+ "dev": true
+ },
+ "lodash.pickby": {
+ "version": "4.6.0",
+ "resolved": "https://registry.npmjs.org/lodash.pickby/-/lodash.pickby-4.6.0.tgz",
+ "integrity": "sha1-feoh2MGNdwOifHBMFdO4SmfjOv8=",
+ "dev": true
+ },
+ "lodash.random": {
+ "version": "3.2.0",
+ "resolved": "https://registry.npmjs.org/lodash.random/-/lodash.random-3.2.0.tgz",
+ "integrity": "sha1-luJOdjMzGZEw0sni/Vf5FwPMJi0=",
+ "dev": true
+ },
+ "lodash.reverse": {
+ "version": "4.0.1",
+ "resolved": "https://registry.npmjs.org/lodash.reverse/-/lodash.reverse-4.0.1.tgz",
+ "integrity": "sha1-Hyr+2s4uFuZg86p8WdMwCm8l0Tw=",
+ "dev": true
+ },
+ "lodash.some": {
+ "version": "4.6.0",
+ "resolved": "https://registry.npmjs.org/lodash.some/-/lodash.some-4.6.0.tgz",
+ "integrity": "sha1-G7nzFO9ri63tE7VJFpsqlF62jk0=",
+ "dev": true
+ },
+ "lodash.uniq": {
+ "version": "4.5.0",
+ "resolved": "https://registry.npmjs.org/lodash.uniq/-/lodash.uniq-4.5.0.tgz",
+ "integrity": "sha1-0CJTc662Uq3BvILklFM5qEJ1R3M=",
+ "dev": true
+ },
+ "lodash.values": {
+ "version": "4.3.0",
+ "resolved": "https://registry.npmjs.org/lodash.values/-/lodash.values-4.3.0.tgz",
+ "integrity": "sha1-o6bCsOvsxcLLocF+bmIP6BtT00c=",
+ "dev": true
+ },
+ "lodash.without": {
+ "version": "4.4.0",
+ "resolved": "https://registry.npmjs.org/lodash.without/-/lodash.without-4.4.0.tgz",
+ "integrity": "sha1-PNRXSgC2e643OpS3SHcmQFB7eqw=",
+ "dev": true
+ },
"lowercase-keys": {
"version": "1.0.1",
"resolved": "https://registry.npmjs.org/lowercase-keys/-/lowercase-keys-1.0.1.tgz",
@@ -5971,6 +9647,12 @@
"safe-buffer": "^5.1.1"
}
},
+ "nofilter": {
+ "version": "1.0.3",
+ "resolved": "https://registry.npmjs.org/nofilter/-/nofilter-1.0.3.tgz",
+ "integrity": "sha512-FlUlqwRK6reQCaFLAhMcF+6VkVG2caYjKQY3YsRDTl4/SEch595Qb3oLjJRDr8dkHAAOVj2pOx3VknfnSgkE5g==",
+ "dev": true
+ },
"normalize-package-data": {
"version": "2.5.0",
"resolved": "https://registry.npmjs.org/normalize-package-data/-/normalize-package-data-2.5.0.tgz",
@@ -7385,6 +11067,29 @@
"resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-2.0.4.tgz",
"integrity": "sha512-4KsaGcPnuhtCZQCxFxN3GVYIhKFPTdLd8PLC552XwbMndtD0cjRFAhDuuydXQ0h08ZfPgzqe6EKHozpuH74iDw=="
},
+ "scrypt-shim": {
+ "version": "github:web3-js/scrypt-shim#be5e616323a8b5e568788bf94d03c1b8410eac54",
+ "from": "github:web3-js/scrypt-shim",
+ "dev": true,
+ "requires": {
+ "scryptsy": "^2.1.0",
+ "semver": "^6.3.0"
+ },
+ "dependencies": {
+ "scryptsy": {
+ "version": "2.1.0",
+ "resolved": "https://registry.npmjs.org/scryptsy/-/scryptsy-2.1.0.tgz",
+ "integrity": "sha512-1CdSqHQowJBnMAFyPEBRfqag/YP9OF394FV+4YREIJX4ljD7OxvQRDayyoyyCk+senRjSkP6VnUNQmVQqB6g7w==",
+ "dev": true
+ },
+ "semver": {
+ "version": "6.3.0",
+ "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+ "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+ "dev": true
+ }
+ }
+ },
"scrypt.js": {
"version": "0.3.0",
"resolved": "https://registry.npmjs.org/scrypt.js/-/scrypt.js-0.3.0.tgz",
@@ -7647,6 +11352,12 @@
"integrity": "sha512-ZcYcZcT69nSLAR2oLN2JwNmLkJEKGooFMCdvOkFrToUt/WfcRWqhIg4P4KwY4dmLbuyXIx4o4YmPsvMRJYJd/w==",
"dev": true
},
+ "sleep-promise": {
+ "version": "8.0.1",
+ "resolved": "https://registry.npmjs.org/sleep-promise/-/sleep-promise-8.0.1.tgz",
+ "integrity": "sha1-jXlaJ+ojlT32tSuRCB5eImZZk8U=",
+ "dev": true
+ },
"slice-ansi": {
"version": "2.1.0",
"resolved": "https://registry.npmjs.org/slice-ansi/-/slice-ansi-2.1.0.tgz",
@@ -7952,6 +11663,62 @@
"resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
"integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q=="
},
+ "spinnies": {
+ "version": "0.4.3",
+ "resolved": "https://registry.npmjs.org/spinnies/-/spinnies-0.4.3.tgz",
+ "integrity": "sha512-TTA2vWXrXJpfThWAl2t2hchBnCMI1JM5Wmb2uyI7Zkefdw/xO98LDy6/SBYwQPiYXL3swx3Eb44ZxgoS8X5wpA==",
+ "dev": true,
+ "requires": {
+ "chalk": "^2.4.2",
+ "cli-cursor": "^3.0.0",
+ "strip-ansi": "^5.2.0"
+ },
+ "dependencies": {
+ "ansi-regex": {
+ "version": "4.1.0",
+ "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+ "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+ "dev": true
+ },
+ "cli-cursor": {
+ "version": "3.1.0",
+ "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+ "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+ "dev": true,
+ "requires": {
+ "restore-cursor": "^3.1.0"
+ }
+ },
+ "onetime": {
+ "version": "5.1.0",
+ "resolved": "https://registry.npmjs.org/onetime/-/onetime-5.1.0.tgz",
+ "integrity": "sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==",
+ "dev": true,
+ "requires": {
+ "mimic-fn": "^2.1.0"
+ }
+ },
+ "restore-cursor": {
+ "version": "3.1.0",
+ "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-3.1.0.tgz",
+ "integrity": "sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==",
+ "dev": true,
+ "requires": {
+ "onetime": "^5.1.0",
+ "signal-exit": "^3.0.2"
+ }
+ },
+ "strip-ansi": {
+ "version": "5.2.0",
+ "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+ "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+ "dev": true,
+ "requires": {
+ "ansi-regex": "^4.1.0"
+ }
+ }
+ }
+ },
"split-string": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -9599,6 +13366,12 @@
"resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
"integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
},
+ "tweetnacl-util": {
+ "version": "0.15.0",
+ "resolved": "https://registry.npmjs.org/tweetnacl-util/-/tweetnacl-util-0.15.0.tgz",
+ "integrity": "sha1-RXbBzuXi1j0gf+5S8boCgZSAvHU=",
+ "dev": true
+ },
"type": {
"version": "1.0.1",
"resolved": "https://registry.npmjs.org/type/-/type-1.0.1.tgz",
diff --git a/package.json b/package.json
index 609988b..f95fe22 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,11 @@
"websnark": "git+https://github.com/peppersec/websnark.git#966eafc47df639195c98374d3c366c32acd6f231"
},
"devDependencies": {
+ "@openzeppelin/contracts-ethereum-package": "^2.2.3",
+ "@openzeppelin/gsn-helpers": "^0.2.0",
+ "@openzeppelin/gsn-provider": "git+https://github.com/peppersec/openzeppelin-gsn-provider.git#4e1d33d4ee5c2486358e16b7da831295b4478631",
+ "@openzeppelin/network": "^0.2.9",
+ "@openzeppelin/upgrades": "^2.5.3",
"truffle-flattener": "^1.4.0"
}
}
diff --git a/test/GSNSupport.test.js b/test/GSNSupport.test.js
new file mode 100644
index 0000000..b96e8fa
--- /dev/null
+++ b/test/GSNSupport.test.js
@@ -0,0 +1,420 @@
+/* global artifacts, web3, contract */
+require('chai')
+ .use(require('bn-chai')(web3.utils.BN))
+ .use(require('chai-as-promised'))
+ .should()
+const fs = require('fs')
+const Web3 = require('web3')
+
+const { toBN, toHex, toChecksumAddress, toWei, fromWei } = require('web3-utils')
+const { takeSnapshot, revertSnapshot } = require('../lib/ganacheHelper')
+const { deployRelayHub, fundRecipient } = require('@openzeppelin/gsn-helpers')
+const { GSNDevProvider, GSNProvider, utils } = require('@openzeppelin/gsn-provider')
+const { ephemeral } = require('@openzeppelin/network')
+
+const Mixer = artifacts.require('./ETHMixer.sol')
+const ERC20Mixer = artifacts.require('./ERC20Mixer.sol')
+const RelayHub = artifacts.require('./IRelayHub.sol')
+const Token = artifacts.require('./ERC20Mock.sol')
+const Uniswap = artifacts.require('./UniswapMock.sol')
+const { ETH_AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT, ERC20_TOKEN, TOKEN_AMOUNT } = process.env
+
+const websnarkUtils = require('websnark/src/utils')
+const buildGroth16 = require('websnark/src/groth16')
+const stringifyBigInts = require('websnark/tools/stringifybigint').stringifyBigInts
+const snarkjs = require('snarkjs')
+const bigInt = snarkjs.bigInt
+const crypto = require('crypto')
+const circomlib = require('circomlib')
+const MerkleTree = require('../lib/MerkleTree')
+
+const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
+const pedersenHash = (data) => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
+
+function generateDeposit() {
+ let deposit = {
+ secret: rbigint(31),
+ nullifier: rbigint(31),
+ }
+ const preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
+ deposit.commitment = pedersenHash(preimage)
+ return deposit
+}
+
+function getRandomReceiver() {
+ let receiver = rbigint(20)
+ while (toHex(receiver.toString()).length !== 42) {
+ receiver = rbigint(20)
+ }
+ return receiver
+}
+
+contract('GSN support', accounts => {
+ let mixer
+ let ercMixer
+ let gsnMixer
+ let hubInstance
+ let relayHubAddress
+ let token
+ let uniswap
+ const sender = accounts[0]
+ const operator = accounts[0]
+ const user = accounts[3]
+ const relayerOwnerAddress = accounts[8]
+ const relayerAddress = accounts[9]// '0x714992E1acbc7f888Be2A1784F0D23e73f4A1ead'
+ const levels = MERKLE_TREE_HEIGHT || 16
+ const zeroValue = EMPTY_ELEMENT || 1337
+ const value = ETH_AMOUNT || '1000000000000000000' // 1 ether
+ let tokenDenomination = TOKEN_AMOUNT || '1000000000000000000' // 1 ether
+ let snapshotId
+ let prefix = 'test'
+ let tree
+ const receiver = getRandomReceiver()
+ let groth16
+ let circuit
+ let proving_key
+ let unstakeDelay = 604800
+ let relayerTxFee = 20 // %
+ let signKey = ephemeral()
+ let gsnWeb3
+ let gsnProvider
+ const postRelayedCallMaxGas = 100000
+ const recipientCallsAtomicOverhead = 5000
+ let postRelayMaxGas = toBN(postRelayedCallMaxGas + recipientCallsAtomicOverhead)
+ // this price is for tokenToEthSwapInput stategy
+ // const eth2daiPriceInput = toBN(toWei('1')).mul(toBN(10e18)).div(toBN('174552286079977583324')) // cause 1 ETH == 174.55 DAI
+ // this price is for tokenToEthSwapOutput stategy
+ const eth2daiPrice = toBN('174552286079977583324') // cause 1 ETH == 174.55 DAI
+
+ before(async () => {
+ tree = new MerkleTree(
+ levels,
+ zeroValue,
+ null,
+ prefix,
+ )
+ mixer = await Mixer.deployed()
+ ercMixer = await ERC20Mixer.deployed()
+ relayHubAddress = toChecksumAddress(await deployRelayHub(web3, {
+ from: sender
+ }))
+
+ await fundRecipient(web3, { recipient: mixer.address, relayHubAddress })
+ await fundRecipient(web3, { recipient: ercMixer.address, relayHubAddress })
+ const currentHub = await mixer.getHubAddr()
+ await ercMixer.upgradeRelayHub(relayHubAddress)
+ if (relayHubAddress !== currentHub) {
+ await mixer.upgradeRelayHub(relayHubAddress)
+ }
+ hubInstance = await RelayHub.at(relayHubAddress)
+ await hubInstance.stake(relayerAddress, unstakeDelay , { from: relayerOwnerAddress, value: toWei('1') })
+ await hubInstance.registerRelay(relayerTxFee, 'http://gsn-dev-relayer.openzeppelin.com/', { from: relayerAddress })
+
+ if (ERC20_TOKEN) {
+ token = await Token.at(ERC20_TOKEN)
+ // uniswap = await Uniswap.at()
+ } else {
+ token = await Token.deployed()
+ await token.mint(user, tokenDenomination)
+ uniswap = await Uniswap.deployed()
+ }
+
+ snapshotId = await takeSnapshot()
+ groth16 = await buildGroth16()
+ circuit = require('../build/circuits/withdraw.json')
+ proving_key = fs.readFileSync('build/circuits/withdraw_proving_key.bin').buffer
+ gsnProvider = new GSNDevProvider('http://localhost:8545', {
+ signKey,
+ relayerOwner: relayerOwnerAddress,
+ relayerAddress,
+ verbose: true,
+ txFee: relayerTxFee
+ })
+ gsnWeb3 = new Web3(gsnProvider, null, { transactionConfirmationBlocks: 1 })
+ gsnMixer = new gsnWeb3.eth.Contract(mixer.abi, mixer.address)
+ })
+
+ describe('#constructor', () => {
+ it('should initialize', async () => {
+ const hub = await mixer.getHubAddr()
+ hub.should.be.equal(relayHubAddress)
+ })
+ })
+
+ describe('#withdrawViaRelayer', () => {
+ it('should work', async () => {
+ const gasPrice = toBN('20000000000')
+ const deposit = generateDeposit()
+ const user = accounts[4]
+ await tree.insert(deposit.commitment)
+
+ const balanceUserBefore = await web3.eth.getBalance(user)
+
+ // Uncomment to measure gas usage
+ // let gas = await mixer.deposit.estimateGas(toBN(deposit.commitment.toString()), { value, from: user, gasPrice: '0' })
+ // console.log('deposit gas:', gas)
+ const txDeposit = await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: user, gasPrice })
+ // console.log('txDeposit', txDeposit.receipt)
+ const txFee = toBN(txDeposit.receipt.gasUsed).mul(gasPrice)
+ // console.log('txFee', txFee.toString())
+ const balanceUserAfter = await web3.eth.getBalance(user)
+ balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(value).add(txFee)))
+
+ const { root, path_elements, path_index } = await tree.path(0)
+
+ // Circuit input
+ const input = stringifyBigInts({
+ // public
+ root,
+ nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
+ receiver,
+ relayer: operator, // this value wont be taken into account
+ fee: bigInt(1), // this value wont be taken into account
+
+ // private
+ nullifier: deposit.nullifier,
+ secret: deposit.secret,
+ pathElements: path_elements,
+ pathIndex: path_index,
+ })
+
+
+ const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
+ const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
+
+ const balanceMixerBefore = await web3.eth.getBalance(mixer.address)
+ const balanceHubBefore = await web3.eth.getBalance(relayHubAddress)
+ const balanceRelayerBefore = await web3.eth.getBalance(relayerAddress)
+ const balanceRelayerOwnerBefore = await web3.eth.getBalance(relayerOwnerAddress)
+ const balanceRecieverBefore = await web3.eth.getBalance(toHex(receiver.toString()))
+ let isSpent = await mixer.isSpent(input.nullifierHash.toString(16).padStart(66, '0x00000'))
+ isSpent.should.be.equal(false)
+
+ const tx = await gsnMixer.methods.withdrawViaRelayer(pi_a, pi_b, pi_c, publicSignals).send({
+ from: signKey.address,
+ gas: 3e6,
+ gasPrice,
+ value: 0
+ })
+ const { events, gasUsed } = tx
+ const balanceMixerAfter = await web3.eth.getBalance(mixer.address)
+ const balanceHubAfter = await web3.eth.getBalance(relayHubAddress)
+ const balanceRelayerAfter = await web3.eth.getBalance(relayerAddress)
+ const balanceRelayerOwnerAfter = await web3.eth.getBalance(relayerOwnerAddress)
+ const balanceRecieverAfter = await web3.eth.getBalance(toHex(receiver.toString()))
+ // console.log('balanceMixerBefore, balanceMixerAfter', balanceMixerBefore.toString(), balanceMixerAfter.toString())
+ // console.log('balanceRecieverBefore, balanceRecieverAfter', balanceRecieverBefore.toString(), balanceRecieverAfter.toString())
+ // console.log('balanceHubBefore, balanceHubAfter', balanceHubBefore.toString(), balanceHubAfter.toString())
+ // console.log('balanceRelayerBefore, balanceRelayerAfter', balanceRelayerBefore.toString(), balanceRelayerAfter.toString(), toBN(balanceRelayerBefore).sub(toBN(balanceRelayerAfter)).toString())
+ // console.log('balanceRelayerOwnerBefore, balanceRelayerOwnerAfter', balanceRelayerOwnerBefore.toString(), balanceRelayerOwnerAfter.toString())
+ balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(value)))
+ const networkFee = toBN(gasUsed).mul(gasPrice)
+ const chargedFee = networkFee.add(networkFee.div(toBN(relayerTxFee)))
+ // console.log('networkFee :', networkFee.toString())
+ // console.log('calculated chargedFee :', chargedFee.toString())
+ const actualFee = toBN(value).sub(toBN(balanceRecieverAfter))
+ // console.log('actual fee :', actualFee.toString())
+ // const postRelayMaxCost = postRelayMaxGas.mul(gasPrice)
+ // const actualFeeWithoutPostCall = actualFee.sub(postRelayMaxCost)
+ // console.log('actualFeeWithoutPostCall :', actualFeeWithoutPostCall.toString())
+ networkFee.should.be.lt.BN(chargedFee)
+ chargedFee.should.be.lt.BN(actualFee)
+
+ balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore).sub(networkFee))
+ balanceRelayerOwnerAfter.should.be.eq.BN(toBN(balanceRelayerOwnerBefore))
+ balanceRecieverAfter.should.be.gt.BN(toBN(balanceRecieverBefore))
+ balanceRecieverAfter.should.be.lt.BN(toBN(value).sub(chargedFee))
+ balanceHubAfter.should.be.eq.BN(toBN(balanceHubBefore).add(actualFee))
+
+ toBN(events.Withdraw.returnValues.nullifierHash).should.be.eq.BN(toBN(input.nullifierHash.toString()))
+ events.Withdraw.returnValues.relayer.should.be.eq.BN(relayerAddress)
+ events.Withdraw.returnValues.to.should.be.eq.BN(toHex(receiver.toString()))
+
+ isSpent = await mixer.isSpent(input.nullifierHash.toString(16).padStart(66, '0x00000'))
+ isSpent.should.be.equal(true)
+ })
+
+ it.skip('should work with relayer selection', async () => {
+ // you should run a relayer or two manualy for this test
+ // npx oz-gsn run-relayer --port 8888
+ const gasPrice = toBN('20000000000')
+ const deposit = generateDeposit()
+ const user = accounts[4]
+ await tree.insert(deposit.commitment)
+
+ await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: user, gasPrice })
+ const { root, path_elements, path_index } = await tree.path(0)
+
+ // Circuit input
+ const input = stringifyBigInts({
+ // public
+ root,
+ nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
+ receiver,
+ relayer: operator, // this value wont be taken into account
+ fee: bigInt(1), // this value wont be taken into account
+
+ // private
+ nullifier: deposit.nullifier,
+ secret: deposit.secret,
+ pathElements: path_elements,
+ pathIndex: path_index,
+ })
+
+
+ const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
+ const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
+
+ // create a provider to look up the relayers
+ gsnProvider = new GSNProvider('http://localhost:8545', {
+ signKey,
+ relayerOwner: relayerOwnerAddress,
+ relayerAddress,
+ verbose: true
+ })
+
+ hubInstance = utils.createRelayHub(web3, relayHubAddress)
+ gsnProvider.relayClient.serverHelper.setHub(hubInstance)
+ let relays = await gsnProvider.relayClient.serverHelper.fetchRelaysAdded()
+ console.log('all relays', relays)
+
+ const { relayUrl, transactionFee } = relays[1]
+ console.log('we are picking', relayUrl)
+ let blockFrom = 0
+ let pinger = await gsnProvider.relayClient.serverHelper.newActiveRelayPinger(blockFrom, relays[2].gasPrice)
+ const predefinedRelay = await pinger.getRelayAddressPing(relayUrl, transactionFee, relays[2].gasPrice )
+ console.log('relay status', predefinedRelay)
+
+ // eslint-disable-next-line require-atomic-updates
+ gsnProvider = new GSNProvider('http://localhost:8545', {
+ signKey,
+ relayerOwner: relayerOwnerAddress,
+ relayerAddress,
+ verbose: true,
+ predefinedRelay // select the relay we want to work with
+ })
+ gsnWeb3 = new Web3(gsnProvider, null, { transactionConfirmationBlocks: 1 })
+ gsnMixer = new gsnWeb3.eth.Contract(mixer.abi, mixer.address)
+
+ const tx = await gsnMixer.methods.withdrawViaRelayer(pi_a, pi_b, pi_c, publicSignals).send({
+ from: signKey.address,
+ gas: 3e6,
+ gasPrice,
+ value: 0
+ })
+ console.log('tx succeed', tx.status)
+ })
+
+ it('uniswap mock test', async () => {
+ const valueToBuy = toBN(toWei('0.04'))
+ await token.approve(uniswap.address, tokenDenomination, { from: user, gasPrice: 0 })
+ const tokens = await uniswap.getTokenToEthOutputPrice(valueToBuy)
+ const balanceBefore = await web3.eth.getBalance(user)
+ const tokenBalanceBefore = await token.balanceOf(user)
+ await uniswap.tokenToEthSwapOutput(valueToBuy, 1, 2, { from: user, gasPrice: 0 })
+ const balanceAfter = await web3.eth.getBalance(user)
+ const tokenBalanceAfter = await token.balanceOf(user)
+ balanceBefore.should.be.eq.BN(toBN(balanceAfter).sub(valueToBuy))
+ tokenBalanceBefore.should.be.eq.BN(toBN(tokenBalanceAfter).add(toBN(tokens)))
+ valueToBuy.mul(eth2daiPrice).div(toBN(toWei('1'))).should.be.eq.BN(tokens)
+ })
+
+ it.only('should work for token', async () => {
+ const gasPrice = toBN('1')
+ const deposit = generateDeposit()
+ const user = accounts[4]
+ await tree.insert(deposit.commitment)
+
+ await token.mint(user, tokenDenomination)
+ await token.approve(ercMixer.address, tokenDenomination, { from: user })
+ await ercMixer.deposit(toBN(deposit.commitment.toString()), { value, from: user, gasPrice })
+
+ const { root, path_elements, path_index } = await tree.path(0)
+
+ // Circuit input
+ const input = stringifyBigInts({
+ // public
+ root,
+ nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
+ receiver,
+ relayer: operator, // this value wont be taken into account
+ fee: bigInt(1), // this value wont be taken into account
+
+ // private
+ nullifier: deposit.nullifier,
+ secret: deposit.secret,
+ pathElements: path_elements,
+ pathIndex: path_index,
+ })
+
+
+ const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
+ const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
+
+ const balanceMixerBefore = await web3.eth.getBalance(ercMixer.address)
+ const balanceHubBefore = await web3.eth.getBalance(relayHubAddress)
+ const balanceRelayerBefore = await web3.eth.getBalance(relayerAddress)
+ const balanceRelayerOwnerBefore = await web3.eth.getBalance(relayerOwnerAddress)
+ const balanceRecieverBefore = await web3.eth.getBalance(toHex(receiver.toString()))
+
+ gsnProvider = new GSNDevProvider('http://localhost:8545', {
+ signKey,
+ relayerOwner: relayerOwnerAddress,
+ relayerAddress,
+ verbose: true,
+ txFee: relayerTxFee
+ })
+ gsnWeb3 = new Web3(gsnProvider, null, { transactionConfirmationBlocks: 1 })
+ gsnMixer = new gsnWeb3.eth.Contract(ercMixer.abi, ercMixer.address)
+
+ const tx = await gsnMixer.methods.withdrawViaRelayer(pi_a, pi_b, pi_c, publicSignals).send({
+ from: signKey.address,
+ gas: 3e6,
+ gasPrice,
+ value: 0
+ })
+ console.log('tx', tx)
+ const { gasUsed } = tx
+ const balanceMixerAfter = await web3.eth.getBalance(ercMixer.address)
+ const balanceHubAfter = await web3.eth.getBalance(relayHubAddress)
+ const balanceRelayerAfter = await web3.eth.getBalance(relayerAddress)
+ const balanceRelayerOwnerAfter = await web3.eth.getBalance(relayerOwnerAddress)
+ const balanceRecieverAfter = await web3.eth.getBalance(toHex(receiver.toString()))
+ // console.log('balanceMixerBefore, balanceMixerAfter', balanceMixerBefore.toString(), balanceMixerAfter.toString())
+ // console.log('balanceRecieverBefore, balanceRecieverAfter', balanceRecieverBefore.toString(), balanceRecieverAfter.toString())
+ // console.log('balanceHubBefore, balanceHubAfter', balanceHubBefore.toString(), balanceHubAfter.toString())
+ // console.log('balanceRelayerBefore, balanceRelayerAfter', balanceRelayerBefore.toString(), balanceRelayerAfter.toString(), toBN(balanceRelayerBefore).sub(toBN(balanceRelayerAfter)).toString())
+ // console.log('balanceRelayerOwnerBefore, balanceRelayerOwnerAfter', balanceRelayerOwnerBefore.toString(), balanceRelayerOwnerAfter.toString())
+ balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(value)))
+ const networkFee = toBN(gasUsed).mul(gasPrice)
+ const chargedFee = networkFee.add(networkFee.div(toBN(relayerTxFee)))
+ // console.log('networkFee :', networkFee.toString())
+ // console.log('calculated chargedFee :', chargedFee.toString())
+ const actualFee = toBN(value).sub(toBN(balanceRecieverAfter))
+ // console.log('actual fee :', actualFee.toString())
+ // const postRelayMaxCost = postRelayMaxGas.mul(gasPrice)
+ // const actualFeeWithoutPostCall = actualFee.sub(postRelayMaxCost)
+ // console.log('actualFeeWithoutPostCall :', actualFeeWithoutPostCall.toString())
+ networkFee.should.be.lt.BN(chargedFee)
+ chargedFee.should.be.lt.BN(actualFee)
+
+ balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore).sub(networkFee))
+ balanceRelayerOwnerAfter.should.be.eq.BN(toBN(balanceRelayerOwnerBefore))
+ balanceRecieverAfter.should.be.gt.BN(toBN(balanceRecieverBefore))
+ balanceRecieverAfter.should.be.lt.BN(toBN(value).sub(chargedFee))
+ balanceHubAfter.should.be.eq.BN(toBN(balanceHubBefore).add(actualFee))
+ })
+ })
+
+ afterEach(async () => {
+ await revertSnapshot(snapshotId.result)
+ // eslint-disable-next-line require-atomic-updates
+ snapshotId = await takeSnapshot()
+ tree = new MerkleTree(
+ levels,
+ zeroValue,
+ null,
+ prefix,
+ )
+ })
+})