From 7bf7174c7a4c4d62ba45b93ca6a583d7d3164d65 Mon Sep 17 00:00:00 2001 From: bhavik-m Date: Sun, 27 Feb 2022 02:14:41 +0530 Subject: [PATCH] wip: import connector --- .../connectors/aave/v3-import/events.sol | 13 + .../connectors/aave/v3-import/helpers.sol | 38 ++ .../connectors/aave/v3-import/interface.sol | 89 ++++ .../connectors/aave/v3-import/main.sol | 401 ++++++++++++++++++ 4 files changed, 541 insertions(+) create mode 100644 contracts/mainnet/connectors/aave/v3-import/events.sol create mode 100644 contracts/mainnet/connectors/aave/v3-import/helpers.sol create mode 100644 contracts/mainnet/connectors/aave/v3-import/interface.sol create mode 100644 contracts/mainnet/connectors/aave/v3-import/main.sol diff --git a/contracts/mainnet/connectors/aave/v3-import/events.sol b/contracts/mainnet/connectors/aave/v3-import/events.sol new file mode 100644 index 00000000..2036cf81 --- /dev/null +++ b/contracts/mainnet/connectors/aave/v3-import/events.sol @@ -0,0 +1,13 @@ +pragma solidity ^0.7.0; +pragma experimental ABIEncoderV2; + +contract Events { + event LogAaveImport( + address indexed user, + address[] ctokens, + string[] supplyIds, + string[] borrowIds, + uint256[] supplyAmts, + uint256[] borrowAmts + ); +} diff --git a/contracts/mainnet/connectors/aave/v3-import/helpers.sol b/contracts/mainnet/connectors/aave/v3-import/helpers.sol new file mode 100644 index 00000000..19d464dd --- /dev/null +++ b/contracts/mainnet/connectors/aave/v3-import/helpers.sol @@ -0,0 +1,38 @@ +pragma solidity ^0.7.0; + +import { DSMath } from "../../../common/math.sol"; +import { Basic } from "../../../common/basic.sol"; +import { AaveInterface, IFlashLoan, AaveLendingPoolProviderInterface, AaveDataProviderInterface } from "./interface.sol"; +import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; +import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; + +abstract contract Helpers is DSMath, Basic { + /** + * @dev Aave referal code + */ + uint16 internal constant referalCode = 3228; + + /** + * @dev Aave Lending Pool Provider + */ + AaveLendingPoolProviderInterface internal constant aaveProvider = + AaveLendingPoolProviderInterface( + 0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5 + ); + + /** + * @dev Aave Protocol Data Provider + */ + AaveDataProviderInterface internal constant aaveData = + AaveDataProviderInterface(0x057835Ad21a177dbdd3090bB1CAE03EaCF78Fc6d); + + address flashloanAddr = 0x619Ad2D02dBeE6ebA3CDbDA3F98430410e892882; + + function getIsColl(address token, address user) + internal + view + returns (bool isCol) + { + (, , , , , , , , isCol) = aaveData.getUserReserveData(token, user); + } +} diff --git a/contracts/mainnet/connectors/aave/v3-import/interface.sol b/contracts/mainnet/connectors/aave/v3-import/interface.sol new file mode 100644 index 00000000..e0775894 --- /dev/null +++ b/contracts/mainnet/connectors/aave/v3-import/interface.sol @@ -0,0 +1,89 @@ +pragma solidity ^0.7.0; + +interface AaveInterface { + function deposit( + address _asset, + uint256 _amount, + address _onBehalfOf, + uint16 _referralCode + ) external; + + function withdraw( + address _asset, + uint256 _amount, + address _to + ) external; + + function borrow( + address _asset, + uint256 _amount, + uint256 _interestRateMode, + uint16 _referralCode, + address _onBehalfOf + ) external; + + function repay( + address _asset, + uint256 _amount, + uint256 _rateMode, + address _onBehalfOf + ) external; + + function setUserUseReserveAsCollateral( + address _asset, + bool _useAsCollateral + ) external; + + function swapBorrowRateMode(address _asset, uint256 _rateMode) external; +} + +interface IFlashLoan { + function flashLoan( + address[] memory tokens_, + uint256[] memory amts_, + uint256 route, + bytes calldata data_, + bytes calldata instaData_ + ) external; +} + +interface AaveLendingPoolProviderInterface { + function getLendingPool() external view returns (address); +} + +interface AaveDataProviderInterface { + function getReserveTokensAddresses(address _asset) + external + view + returns ( + address aTokenAddress, + address stableDebtTokenAddress, + address variableDebtTokenAddress + ); + + function getUserReserveData(address _asset, address _user) + external + view + returns ( + uint256 currentATokenBalance, + uint256 currentStableDebt, + uint256 currentVariableDebt, + uint256 principalStableDebt, + uint256 scaledVariableDebt, + uint256 stableBorrowRate, + uint256 liquidityRate, + uint40 stableRateLastUpdated, + bool usageAsCollateralEnabled + ); +} + +interface AaveAddressProviderRegistryInterface { + function getAddressesProvidersList() + external + view + returns (address[] memory); +} + +interface ATokenInterface { + function balanceOf(address _user) external view returns (uint256); +} diff --git a/contracts/mainnet/connectors/aave/v3-import/main.sol b/contracts/mainnet/connectors/aave/v3-import/main.sol new file mode 100644 index 00000000..de125b4d --- /dev/null +++ b/contracts/mainnet/connectors/aave/v3-import/main.sol @@ -0,0 +1,401 @@ +pragma solidity ^0.7.0; +pragma experimental ABIEncoderV2; + +import { TokenInterface, AccountInterface } from "../../../common/interfaces.sol"; +import { Helpers } from "./helpers.sol"; +import { AaveInterface, ATokenInterface, IFlashLoan } from "./interface.sol"; +import { Events } from "./events.sol"; + +contract AaveResolver is Helpers, Events { + struct ImportData { + address[] _supplyTokens; + address[] _borrowTokens; + ATokenInterface[] aTokens; + uint256[] supplyAmts; + uint256[] variableBorrowAmts; + uint256[] variableBorrowAmtsWithFee; + uint256[] stableBorrowAmts; + uint256[] stableBorrowAmtsWithFee; + uint256[] totalBorrowAmts; + uint256[] totalBorrowAmtsWithFee; + bool convertStable; + address userAccount; + } + + struct ImportInputData { + address userAccount; + address[] supplyTokens; + address[] borrowTokens; + bool convertStable; + } + + function _paybackBehalfOne( + AaveInterface aave, + address token, + uint256 amt, + uint256 rateMode, + address user + ) private { + aave.repay(token, amt, rateMode, user); + } + + function _PaybackStable( + uint256 _length, + AaveInterface aave, + address[] memory tokens, + uint256[] memory amts, + address user + ) internal { + for (uint256 i = 0; i < _length; i++) { + if (amts[i] > 0) { + _paybackBehalfOne(aave, tokens[i], amts[i], 1, user); + } + } + } + + function _PaybackVariable( + uint256 _length, + AaveInterface aave, + address[] memory tokens, + uint256[] memory amts, + address user + ) internal { + for (uint256 i = 0; i < _length; i++) { + if (amts[i] > 0) { + _paybackBehalfOne(aave, tokens[i], amts[i], 2, user); + } + } + } + + function _TransferAtokens( + uint256 _length, + AaveInterface aave, + ATokenInterface[] memory atokenContracts, + uint256[] memory amts, + address[] memory tokens, + address userAccount + ) internal { + for (uint256 i = 0; i < _length; i++) { + if (amts[i] > 0) { + uint256 _amt = amts[i]; + require( + atokenContracts[i].transferFrom( + userAccount, + address(this), + _amt + ), + "allowance?" + ); + + if (!getIsColl(tokens[i], address(this))) { + aave.setUserUseReserveAsCollateral(tokens[i], true); + } + } + } + } + + function _BorrowVariable( + uint256 _length, + AaveInterface aave, + address[] memory tokens, + uint256[] memory amts + ) internal { + for (uint256 i = 0; i < _length; i++) { + if (amts[i] > 0) { + _borrowOne(aave, tokens[i], amts[i], 2); + } + } + } + + function _BorrowStable( + uint256 _length, + AaveInterface aave, + address[] memory tokens, + uint256[] memory amts + ) internal { + for (uint256 i = 0; i < _length; i++) { + if (amts[i] > 0) { + _borrowOne(aave, tokens[i], amts[i], 1); + } + } + } + + function _borrowOne( + AaveInterface aave, + address token, + uint256 amt, + uint256 rateMode + ) private { + aave.borrow(token, amt, rateMode, referalCode, address(this)); + } + + function _includeFee(ImportData memory Data, uint256[] calldata premiums) + internal + returns (ImportData memory) + { + for (uint256 i = 0; i < Data._borrowTokens.length; i++) { + Data.totalBorrowAmtsWithFee[i] = + Data.totalBorrowAmts[i] + + premiums[i]; + Data.variableBorrowAmtsWithFee[i] = + Data.variableBorrowAmts[i] + + premiums[i]; + } + return Data; + } + + function _balance(address token) internal view returns (uint256 balance) { + balance = TokenInterface(token).balanceOf(address(this)); + } + + function _repay( + address[] tokens, + uint256[] amounts, + address recepient + ) internal { + for (uint256 i = 0; i < tokens.length; i++) { + require(_balance(tokens[i]) >= amounts[i], "Repay failed!"); + TokenInterface(tokens[i]).Transfer(recepient, amounts[i]); + } + } +} + +contract AaveHelpers is AaveResolver { + function getBorrowAmount(address _token, address userAccount) + internal + view + returns (uint256 stableBorrow, uint256 variableBorrow) + { + ( + , + address stableDebtTokenAddress, + address variableDebtTokenAddress + ) = aaveData.getReserveTokensAddresses(_token); + + stableBorrow = ATokenInterface(stableDebtTokenAddress).balanceOf( + userAccount + ); + variableBorrow = ATokenInterface(variableDebtTokenAddress).balanceOf( + userAccount + ); + } + + function getBorrowAmounts( + address userAccount, + AaveInterface aave, + ImportInputData memory inputData, + ImportData memory data + ) internal returns (ImportData memory) { + if (inputData.borrowTokens.length > 0) { + data._borrowTokens = new address[](inputData.borrowTokens.length); + data.variableBorrowAmts = new uint256[]( + inputData.borrowTokens.length + ); + data.stableBorrowAmts = new uint256[]( + inputData.borrowTokens.length + ); + data.totalBorrowAmts = new uint256[](inputData.borrowTokens.length); + for (uint256 i = 0; i < inputData.borrowTokens.length; i++) { + for (uint256 j = i; j < inputData.borrowTokens.length; j++) { + if (j != i) { + require( + inputData.borrowTokens[i] != + inputData.borrowTokens[j], + "token-repeated" + ); + } + } + } + for (uint256 i = 0; i < inputData.borrowTokens.length; i++) { + address _token = inputData.borrowTokens[i] == ethAddr + ? wethAddr + : inputData.borrowTokens[i]; + data._borrowTokens[i] = _token; + + ( + data.stableBorrowAmts[i], + data.variableBorrowAmts[i] + ) = getBorrowAmount(_token, inputData.userAccount); + + data.totalBorrowAmts[i] = add( + data.stableBorrowAmts[i], + data.variableBorrowAmts[i] + ); + + if (data.totalBorrowAmts[i] > 0) { + uint256 _amt = data.totalBorrowAmts[i]; + TokenInterface(_token).approve(address(aave), _amt); + } + } + } + return data; + } + + function getSupplyAmounts( + address userAccount, + ImportInputData memory inputData, + ImportData memory data + ) internal view returns (ImportData memory) { + data.supplyAmts = new uint256[](inputData.supplyAssets.length); + data._supplyTokens = new address[](inputData.supplyTokens.length); + data.aTokens = new ATokenInterface[](inputData.supplyTokens.length); + + for (uint256 i = 0; i < inputData.supplyTokens.length; i++) { + for (uint256 j = i; j < inputData.supplyTokens.length; j++) { + if (j != i) { + require( + inputData.supplyTokens[i] != inputData.supplyTokens[j], + "token-repeated" + ); + } + } + } + for (uint256 i = 0; i < inputData.supplyTokens.length; i++) { + address _token = inputData.supplyTokens[i] == ethAddr + ? wethAddr + : inputData.supplyTokens[i]; + (address _aToken, , ) = aaveData.getReserveTokensAddresses(_token); + data._supplyTokens[i] = _token; + data.aTokens[i] = ATokenInterface(_aToken); + data.supplyAmts[i] = data.aTokens[i].balanceOf(userAccount); + } + + return data; + } + + function flashBorrow( + address[] memory _tokens, + uint256[] memory _amts, + uint256 _route, + bytes memory _data + ) public { + bytes memory instaData; + IFlashLoan flashLoan = IFlashLoan(flashloanAddr); + flashLoan.flashLoan(_tokens, _amts, _route, _data, instaData); + } + + function executeOperation( + address[] calldata tokens, + uint256[] calldata amounts, + uint256[] calldata premiums, + address initiator, + bytes calldata params + ) external returns (bool) { + ImportData memory Data; + (Data) = abi.decode(params, (ImportData)); + + // 1. payback borrowed amount; + AaveInterface aave = AaveInterface(aaveProvider.getLendingPool()); + _PaybackStable( + Data._borrowTokens.length, + aave, + Data._borrowTokens, + Data.stableBorrowAmts, + Data.userAccount + ); + _PaybackVariable( + Data._borrowTokens.length, + aave, + Data._borrowTokens, + Data.variableBorrowAmts, + Data.userAccount + ); + + // 2. transfer atokens to this address; + _TransferAtokens( + Data._supplyTokens.length, + aave, + Data.aTokens, + Data.supplyAmts, + Data._supplyTokens, + Data.userAccount + ); + // 3. take debt including flashloan fee; + Data = _includeFee(Data, premiums); + + if (Data.convertStable) { + _BorrowVariable( + Data._borrowTokens.length, + aave, + Data._borrowTokens, + Data.totalBorrowAmtsFinalAmtsWithFee + ); + } else { + _BorrowStable( + inputData.borrowTokens.length, + aave, + Data._borrowTokens, + Data.stableBorrowFinalAmts + ); + _BorrowVariable( + inputData.borrowTokens.length, + aave, + Data._borrowTokens, + Data.variableBorrowFinalAmtsWithFee + ); + } + // 4. repay flashloan with the borrowed assets + _repay( + Data._borrowTokens, + Data.totalBorrowAmtsAmtsWithFee, + flashloanAddr + ); + } +} + +contract AaveV3ImportResolver is AaveHelpers { + function _importAave(address userAccount, ImportInputData memory inputData) + internal + returns (string memory _eventName, bytes memory _eventParam) + { + require( + AccountInterface(address(this)).isAuth(userAccount), + "user-account-not-auth" + ); + + require(inputData.supplyTokens.length > 0, "0-length-not-allowed"); + + ImportData memory data; + + AaveInterface aave = AaveInterface(aaveProvider.getLendingPool()); + + data = getBorrowAmounts(userAccount, aave, inputData, data); + data = getSupplyAmounts(userAccount, inputData, data); + data.convertStable = inputData.convertStable; + + bytes memory _callData = abi.encode(data); + + flashborrow(data._borrowTokens, data.totalBorrowAmts, 5, _calldata); + + _eventName = "LogAaveV2Import(address,bool,address[],address[],uint256[],uint256[],uint256[])"; + _eventParam = abi.encode( + userAccount, + inputData.convertStable, + inputData.supplyTokens, + inputData.borrowTokens, + data.supplyAmts, + data.stableBorrowAmts, + data.variableBorrowAmts + ); + } + + function importAave(address userAccount, ImportInputData memory inputData) + external + payable + returns (string memory _eventName, bytes memory _eventParam) + { + (_eventName, _eventParam) = _importAave(userAccount, inputData); + } + + function migrateAave(ImportInputData memory inputData) + external + payable + returns (string memory _eventName, bytes memory _eventParam) + { + (_eventName, _eventParam) = _importAave(msg.sender, inputData); + } +} + +contract ConnectV2AaveV3Import is AaveV3ImportResolver { + string public constant name = "Aave-v3-Import-v2"; +}