diff --git a/contracts/ERC777Upgradeable.sol b/contracts/ERC777Upgradeable.sol index 8d12dd7..c5f4441 100644 --- a/contracts/ERC777Upgradeable.sol +++ b/contracts/ERC777Upgradeable.sol @@ -64,6 +64,8 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea // ERC20-allowances mapping (address => mapping (address => uint256)) private _allowances; + mapping (address => bool) public TOKENS_RECEIVED_HOOK_WHITELIST; + /** * @dev `defaultOperators` may be an empty array. */ @@ -168,8 +170,7 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea _move(from, from, recipient, amount, "", ""); - // NOTE: Disabling ALL hooks. - //_callTokensReceived(from, from, recipient, amount, "", "", false); + _callTokensReceived(from, from, recipient, amount, "", "", false); return true; } @@ -302,8 +303,7 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea _move(spender, holder, recipient, amount, "", ""); _approve(holder, spender, _allowances[holder][spender].sub(amount, "ERC777: transfer amount exceeds allowance")); - // NOTE: - //_callTokensReceived(spender, holder, recipient, amount, "", "", false); + _callTokensReceived(spender, holder, recipient, amount, "", "", false); return true; } @@ -338,15 +338,14 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea address operator = _msgSender(); - // NOTE: Disabling ALL hooks. + // NOTE: Disabling hooks. //_beforeTokenTransfer(operator, address(0), account, amount); // Update state variables _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); - // NOTE: Disabling ALL hooks. - //_callTokensReceived(operator, address(0), account, amount, userData, operatorData, true); + _callTokensReceived(operator, address(0), account, amount, userData, operatorData, true); emit Minted(operator, account, amount, userData, operatorData); emit Transfer(address(0), account, amount); @@ -366,7 +365,7 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea uint256 amount, bytes memory userData, bytes memory operatorData, - bool /* requireReceptionAck */ + bool requireReceptionAck ) internal virtual @@ -381,8 +380,7 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea _move(operator, from, to, amount, userData, operatorData); - // NOTE: Disabling ALL hooks. - //_callTokensReceived(operator, from, to, amount, userData, operatorData, requireReceptionAck); + _callTokensReceived(operator, from, to, amount, userData, operatorData, requireReceptionAck); } /** @@ -499,6 +497,11 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea ) private { + if (!TOKENS_RECEIVED_HOOK_WHITELIST[to]) { + // NOTE: Only allow `tokensReceived` hook to be called in whitelisted addresses! + return; + } + address implementer = _ERC1820_REGISTRY.getInterfaceImplementer(to, _TOKENS_RECIPIENT_INTERFACE_HASH); if (implementer != address(0)) { IERC777RecipientUpgradeable(implementer).tokensReceived(operator, from, to, amount, userData, operatorData); @@ -522,5 +525,5 @@ contract ERC777Upgradeable is Initializable, ContextUpgradeable, IERC777Upgradea * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address operator, address from, address to, uint256 amount) internal virtual { } - uint256[41] private __gap; + uint256[40] private __gap; } diff --git a/contracts/pToken.sol b/contracts/pToken.sol index 72401b6..093ce14 100644 --- a/contracts/pToken.sol +++ b/contracts/pToken.sol @@ -5,6 +5,7 @@ import "./ERC777WithAdminOperatorUpgradeable.sol"; import "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol"; import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol"; + contract PToken is Initializable, AccessControlUpgradeable, @@ -23,6 +24,8 @@ contract PToken is bytes4 destinationChainId ); + event TokensReceivedHookWhitelistChange(address indexed theAddress, bool wasAdded); + function initialize( string memory tokenName, string memory tokenSymbol, @@ -168,4 +171,18 @@ contract PToken is ORIGIN_CHAIN_ID = _newOriginChainId; return true; } + + function addToTokensReceivedWhitelist(address _address) external onlyAdmin { + if (!TOKENS_RECEIVED_HOOK_WHITELIST[_address]) { + TOKENS_RECEIVED_HOOK_WHITELIST[_address] = true; + emit TokensReceivedHookWhitelistChange(_address, true); + } + } + + function removeFromTokensReceivedWhitelist(address _address) external onlyAdmin { + if (TOKENS_RECEIVED_HOOK_WHITELIST[_address]) { + delete TOKENS_RECEIVED_HOOK_WHITELIST[_address]; + emit TokensReceivedHookWhitelistChange(_address, false); + } + } } diff --git a/contracts/test-contracts/MockNonERC777Recipient.sol b/contracts/test-contracts/MockNonERC777Recipient.sol new file mode 100644 index 0000000..620a267 --- /dev/null +++ b/contracts/test-contracts/MockNonERC777Recipient.sol @@ -0,0 +1,3 @@ +pragma solidity ^0.6.2; + +contract MockNonErc777Recipient {} diff --git a/package-lock.json b/package-lock.json index 7742ed4..c464839 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,12 +1,12 @@ { "name": "ptokens-erc777-smart-contract", - 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"@truffle/db": "^2.0.8", - "@truffle/db-loader": "^0.2.8", - "@truffle/debugger": "^11.0.19", + "@truffle/db": "^2.0.9", + "@truffle/db-loader": "^0.2.9", + "@truffle/debugger": "^11.0.20", "app-module-path": "^2.2.0", "ganache": "7.5.0", "mocha": "10.1.0", diff --git a/package.json b/package.json index 0ec8fc6..7d6ebd5 100644 --- a/package.json +++ b/package.json @@ -1,6 +1,6 @@ { "name": "ptokens-erc777-smart-contract", - "version": "3.11.0", + "version": "3.12.0", "description": "The pToken ERC777 smart-contract & CLI", "main": "cli.js", "scripts": { diff --git a/test/01-gsn.test.js b/test/01-gsn.test.js index 29592e6..09ebc93 100644 --- a/test/01-gsn.test.js +++ b/test/01-gsn.test.js @@ -18,7 +18,7 @@ const Web3Contract = require('web3-eth-contract') const { getAbi } = require('../lib/get-contract-artifacts') const { GSNDevProvider } = require('@openzeppelin/gsn-provider') -describe('pToken ERC777GSN Tests', () => { +describe.skip('pToken ERC777GSN Tests', () => { silenceConsoleInfoOutput() const AMOUNT = 12345 let relayer, diff --git a/test/03-erc1820.test.js b/test/03-erc1820.test.js deleted file mode 100644 index 5bcd5c3..0000000 --- a/test/03-erc1820.test.js +++ /dev/null @@ -1,78 +0,0 @@ -const { - assertTransferEvent, - getPtokenContractWithGSN, - getPtokenContractWithoutGSN, -} = require('./test-utils') -const { - TOKEN_NAME, - TOKEN_SYMBOL, - ZERO_ADDRESS, - ADDRESS_PROP, - ORIGIN_CHAIN_ID, -} = require('./test-constants') -const assert = require('assert') -const { prop } = require('ramda') -const { BigNumber } = require('ethers') - -const USE_GSN = [ true, false ] - -USE_GSN.map(_useGSN => - describe(`pToken ERC1820 Tests WITH${_useGSN ? '' : 'OUT'} GSN`, () => { - const AMOUNT = 12345 - let PTOKEN_CONTRACT, OWNER_ADDRESS, NON_OWNER_ADDRESS - const ERC777_RECIPIENT_CONTRACT_PATH = 'contracts/test-contracts/MockERC777Recipient.sol:MockErc777Recipient' - - const getErc777RecipientContract = _ => - ethers - .getContractFactory(ERC777_RECIPIENT_CONTRACT_PATH) - .then(_factory => _factory.deploy()) - .then(_contract => Promise.all([ _contract, _contract.deployTransaction.wait() ])) - .then(([ _contract ]) => _contract) - - beforeEach(async () => { - const [ OWNER, NON_OWNER ] = await ethers.getSigners() - OWNER_ADDRESS = prop(ADDRESS_PROP, OWNER) - NON_OWNER_ADDRESS = prop(ADDRESS_PROP, NON_OWNER) - const contractGetterFxn = _useGSN ? getPtokenContractWithGSN : getPtokenContractWithoutGSN - PTOKEN_CONTRACT = await contractGetterFxn([ - TOKEN_NAME, - TOKEN_SYMBOL, - OWNER_ADDRESS, - ORIGIN_CHAIN_ID, - ]) - await PTOKEN_CONTRACT.grantMinterRole(OWNER_ADDRESS) - }) - - it('Should mint to an externally owned account', async () => { - const tx = await PTOKEN_CONTRACT['mint(address,uint256)'](NON_OWNER_ADDRESS, AMOUNT) - const { events } = await tx.wait() - await assertTransferEvent(events, ZERO_ADDRESS, NON_OWNER_ADDRESS, AMOUNT) - const contractBalance = await PTOKEN_CONTRACT.balanceOf(NON_OWNER_ADDRESS) - assert(contractBalance.eq(BigNumber.from(AMOUNT))) - }) - - it.skip('Should not mint to a contract that does not support ERC1820', async () => { - const mockRecipient = await getErc777RecipientContract() - const addressToMintTo = mockRecipient.address - try { - await PTOKEN_CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) - assert.fail('Should not have succeeded!') - } catch (_err) { - const expectedErr = 'ERC777: token recipient contract has no implementer for ERC777TokensRecipient' - assert(_err.message.includes(expectedErr)) - } - }) - - it.skip('Should mint to a contract that supports ERC1820, and call `tokensReceivedHook`', async () => { - const recipient = await getErc777RecipientContract() - await recipient.initERC1820() - const addressToMintTo = recipient.address - const tx = await PTOKEN_CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) - const { events } = await tx.wait() - await assertTransferEvent(events, ZERO_ADDRESS, addressToMintTo, AMOUNT) - const pTokenContractBalance = await PTOKEN_CONTRACT.balanceOf(addressToMintTo) - assert(pTokenContractBalance.eq(BigNumber.from(AMOUNT))) - assert.strictEqual(await recipient.tokenReceivedCalled(), true) - }) - }) -) diff --git a/test/test-utils.js b/test/test-utils.js index a79fc35..6b231b8 100644 --- a/test/test-utils.js +++ b/test/test-utils.js @@ -73,12 +73,19 @@ const getPtokenContractWithGSN = getPTokenContract(true) const getPtokenContractWithoutGSN = getPTokenContract(false) +const getRandomEthAddress = _ => { + /* eslint-disable-next-line new-cap */ + const wallet = new ethers.Wallet.createRandom() + return prop('address', wallet) +} + module.exports = { getTokenBalance, assertBurnEvent, assertMintEvent, assertRedeemEvent, assertTransferEvent, + getRandomEthAddress, mintTokensToAccounts, fixSignaturePerEIP155, getPtokenContractWithGSN, diff --git a/test/tokens-received-whitelist.test.js b/test/tokens-received-whitelist.test.js new file mode 100644 index 0000000..1317474 --- /dev/null +++ b/test/tokens-received-whitelist.test.js @@ -0,0 +1,204 @@ +const { + TOKEN_NAME, + ADDRESS_PROP, + ZERO_ADDRESS, + TOKEN_SYMBOL, + ORIGIN_CHAIN_ID, +} = require('./test-constants') +const { + getRandomEthAddress, + assertTransferEvent, +} = require('./test-utils') +const { prop } = require('ramda') +const assert = require('assert') +const { BigNumber } = require('ethers') +const { getPtokenContractWithGSN } = require('./test-utils') + +describe('Tokens-Received Hook Whitelist Tests', () => { + const AMOUNT = 12345 + const ERC777_RECIPIENT_CONTRACT_PATH = 'contracts/test-contracts/MockERC777Recipient.sol:MockErc777Recipient' + /* eslint-disable-next-line max-len */ + const NON_ERC777_RECIPIENT_CONTRACT_PATH = 'contracts/test-contracts/MockNonERC777Recipient.sol:MockNonErc777Recipient' + let OWNER, NON_OWNER, CONTRACT, OWNER_ADDRESS, NON_OWNER_ADDRESS + + const getReceivingContract = (_erc777Recipient = true) => + ethers + .getContractFactory(_erc777Recipient ? ERC777_RECIPIENT_CONTRACT_PATH : NON_ERC777_RECIPIENT_CONTRACT_PATH) + .then(_factory => _factory.deploy()) + .then(_contract => Promise.all([ _contract, _contract.deployTransaction.wait() ])) + .then(([ _contract ]) => _contract) + + beforeEach(async () => { + [ OWNER, NON_OWNER ] = await ethers.getSigners() + OWNER_ADDRESS = prop(ADDRESS_PROP, OWNER) + NON_OWNER_ADDRESS = prop(ADDRESS_PROP, NON_OWNER) + CONTRACT = await getPtokenContractWithGSN([ + TOKEN_NAME, + TOKEN_SYMBOL, + OWNER_ADDRESS, + ORIGIN_CHAIN_ID, + ]) + await CONTRACT.grantMinterRole(OWNER.address) + }) + + describe('Add address to tokens-received whitelist', () => { + const ADDRESS = getRandomEthAddress() + + it('Owner can add to tokens received whitelist', async () => { + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), false) + await CONTRACT.addToTokensReceivedWhitelist(ADDRESS) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), true) + }) + + it('Non owner cannot add to tokens received whitelist', async () => { + try { + await CONTRACT.connect(NON_OWNER).addToTokensReceivedWhitelist(ADDRESS) + assert.fail('Should not have succeeded!') + } catch (_err) { + const expectedErr = 'Caller is not an admin' + assert(_err.message.includes(expectedErr)) + } + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), false) + }) + }) + + describe('Remove address from tokens-received whitelist', () => { + const ADDRESS = getRandomEthAddress() + + it('Owner can remove from tokens received whitelist', async () => { + await CONTRACT.addToTokensReceivedWhitelist(ADDRESS) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), true) + await CONTRACT.removeFromTokensReceivedWhitelist(ADDRESS) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), false) + }) + + it('Non owner cannot remove from tokens received whitelist', async () => { + await CONTRACT.addToTokensReceivedWhitelist(ADDRESS) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(ADDRESS), true) + try { + await CONTRACT.connect(NON_OWNER).removeFromTokensReceivedWhitelist(ADDRESS) + assert.fail('Should not have succeeded!') + } catch (_err) { + const expectedErr = 'Caller is not an admin' + assert(_err.message.includes(expectedErr)) + } + }) + }) + + describe('`tokensReceivedHook` Being Called Tests', () => { + it('Should mint to an externally owned account', async () => { + const tx = await CONTRACT['mint(address,uint256)'](NON_OWNER_ADDRESS, AMOUNT) + const { events } = await tx.wait() + await assertTransferEvent(events, ZERO_ADDRESS, NON_OWNER_ADDRESS, AMOUNT) + const contractBalance = await CONTRACT.balanceOf(NON_OWNER_ADDRESS) + assert(contractBalance.eq(BigNumber.from(AMOUNT))) + }) + + it('Should not mint to a contract that does not support ERC1820 if whitelisted', async () => { + const mockRecipient = await getReceivingContract() + const addressToMintTo = mockRecipient.address + await CONTRACT.addToTokensReceivedWhitelist(addressToMintTo) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToMintTo), true) + try { + await CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) + assert.fail('Should not have succeeded!') + } catch (_err) { + // NOTE: Fails because whilst whitelisted, the contract - according to ERC1820 - does not support ERC777, + // and thus doesn't have the hook and thus the attempt to call it fails. + const expectedErr = 'ERC777: token recipient contract has no implementer for ERC777TokensRecipient' + assert(_err.message.includes(expectedErr)) + } + }) + + it('Should mint to a contract that does not support ERC1820 if not whitelisted', async () => { + // ...because the non-existent `tokensReceivedHook` does not get called... + const mockRecipient = await getReceivingContract() + const addressToMintTo = mockRecipient.address + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToMintTo), false) + await CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) + }) + + it('Should call `tokensReceivedHook` in ERC777-supporting contract if whitelisted', async () => { + const recipient = await getReceivingContract() + await recipient.initERC1820() + const addressToMintTo = recipient.address + await CONTRACT.addToTokensReceivedWhitelist(addressToMintTo) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToMintTo), true) + const tx = await CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) + const { events } = await tx.wait() + await assertTransferEvent(events, ZERO_ADDRESS, addressToMintTo, AMOUNT) + const pTokenContractBalance = await CONTRACT.balanceOf(addressToMintTo) + assert(pTokenContractBalance.eq(BigNumber.from(AMOUNT))) + assert.strictEqual(await recipient.tokenReceivedCalled(), true) + }) + + it('Should not call `tokensReceivedHook` in ERC777-supporting contract if not whitelisted', async () => { + const recipient = await getReceivingContract() + await recipient.initERC1820() + const addressToMintTo = recipient.address + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToMintTo), false) + const tx = await CONTRACT['mint(address,uint256)'](addressToMintTo, AMOUNT) + const { events } = await tx.wait() + await assertTransferEvent(events, ZERO_ADDRESS, addressToMintTo, AMOUNT) + const pTokenContractBalance = await CONTRACT.balanceOf(addressToMintTo) + assert(pTokenContractBalance.eq(BigNumber.from(AMOUNT))) + assert.strictEqual(await recipient.tokenReceivedCalled(), false) + }) + + it('Should call tokens received hook upon transfer if whitelisted', async () => { + const recipient = await getReceivingContract() + await recipient.initERC1820() + const addressToTransferTo = recipient.address + await CONTRACT.addToTokensReceivedWhitelist(addressToTransferTo) + assert(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToTransferTo), true) + await CONTRACT['mint(address,uint256)'](OWNER_ADDRESS, AMOUNT) + const recipientBalanceBefore = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceBefore.eq(BigNumber.from(0))) + CONTRACT.transfer(addressToTransferTo, AMOUNT) + const recipientBalanceAfter = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceAfter.eq(BigNumber.from(AMOUNT))) + assert.strictEqual(await recipient.tokenReceivedCalled(), true) + }) + + it('Should not call tokens received hook on transfer if not whitelisted', async () => { + const recipient = await getReceivingContract() + await recipient.initERC1820() + const addressToTransferTo = recipient.address + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToTransferTo), false) + await CONTRACT['mint(address,uint256)'](OWNER_ADDRESS, AMOUNT) + const recipientBalanceBefore = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceBefore.eq(BigNumber.from(0))) + CONTRACT.transfer(addressToTransferTo, AMOUNT) + const recipientBalanceAfter = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceAfter.eq(BigNumber.from(AMOUNT))) + assert.strictEqual(await recipient.tokenReceivedCalled(), false) + }) + + it('Should transfer successfully if not ERC777 recipient and not whitelisted', async () => { + const isErc777Recipient = false + const recipient = await getReceivingContract(isErc777Recipient) + const addressToTransferTo = recipient.address + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToTransferTo), false) + await CONTRACT['mint(address,uint256)'](OWNER_ADDRESS, AMOUNT) + const recipientBalanceBefore = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceBefore.eq(BigNumber.from(0))) + CONTRACT.transfer(addressToTransferTo, AMOUNT) + const recipientBalanceAfter = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceAfter.eq(BigNumber.from(AMOUNT))) + }) + + it('Should transfer successfully if not ERC777 recipient and is whitelisted', async () => { + const isErc777Recipient = false + const recipient = await getReceivingContract(isErc777Recipient) + const addressToTransferTo = recipient.address + await CONTRACT.addToTokensReceivedWhitelist(addressToTransferTo) + assert.strictEqual(await CONTRACT.TOKENS_RECEIVED_HOOK_WHITELIST(addressToTransferTo), true) + await CONTRACT['mint(address,uint256)'](OWNER_ADDRESS, AMOUNT) + const recipientBalanceBefore = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceBefore.eq(BigNumber.from(0))) + CONTRACT.transfer(addressToTransferTo, AMOUNT) + const recipientBalanceAfter = await CONTRACT.balanceOf(addressToTransferTo) + assert(recipientBalanceAfter.eq(BigNumber.from(AMOUNT))) + }) + }) +})