mirror of
https://github.com/Instadapp/aave-protocol-v2.git
synced 2024-07-29 21:47:30 +00:00
72 lines
2.7 KiB
Solidity
72 lines
2.7 KiB
Solidity
// SPDX-License-Identifier: agpl-3.0
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pragma solidity ^0.6.8;
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pragma experimental ABIEncoderV2;
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import {BaseUniswapAdapter} from './BaseUniswapAdapter.sol';
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import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol';
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import {IUniswapV2Router02} from '../interfaces/IUniswapV2Router02.sol';
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import {IFlashLoanReceiver} from '../flashloan/interfaces/IFlashLoanReceiver.sol';
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import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
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/**
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* @title UniswapRepayAdapter
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* @notice Uniswap V2 Adapter to perform a repay of a debt using a flash loan.
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* @author Aave
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**/
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contract UniswapRepayAdapter is BaseUniswapAdapter, IFlashLoanReceiver {
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constructor(
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ILendingPoolAddressesProvider _addressesProvider,
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IUniswapV2Router02 _uniswapRouter
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)
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public
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BaseUniswapAdapter(_addressesProvider, _uniswapRouter)
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{}
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/**
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* @dev Swaps the received reserve amount into the asset specified in the params. The received funds from the swap are
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* then used to repay a debt on the protocol on behalf of the user.
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* The user should give this contract allowance to pull the ATokens in order to withdraw the underlying asset and
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* repay the flash loan.
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* @param assets Address to be swapped
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* @param amounts Amount of the reserve to be swapped
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* @param premiums Fee of the flash loan
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* @param params Additional variadic field to include extra params. Expected parameters:
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* address assetToSwapTo Address of the reserve to be swapped to and deposited
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* address user The address of the user
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* uint256 leftOverAction Flag indicating what to do with the left over balance from the swap:
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* (0) Deposit back
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* (1) Direct transfer to user
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* uint256 repayAmount Amount of debt to be repaid
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* uint256 rateMode The rate modes of the debt to be repaid
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*/
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function executeOperation(
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address[] calldata assets,
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uint256[] calldata amounts,
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uint256[] calldata premiums,
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bytes calldata params
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) external override returns (bool) {
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(
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address assetToSwapTo,
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address user,
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uint256 leftOverAction,
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uint256 repayAmount,
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uint256 rateMode
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) = abi.decode(params, (address, address, uint256, uint256, uint256));
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swapTokensForExactTokens(assets[0], assetToSwapTo, amounts[0], repayAmount);
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// Repay debt
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IERC20(assetToSwapTo).approve(address(pool), repayAmount);
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pool.repay(assetToSwapTo, repayAmount, rateMode, user);
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uint256 flashLoanDebt = amounts[0].add(premiums[0]);
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pullATokenAndRepayFlashLoan(assets[0], user, flashLoanDebt);
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// Take care of reserve leftover from the swap
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sendLeftOver(assets[0], flashLoanDebt, leftOverAction, user);
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return true;
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}
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}
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