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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; | |
import "@openzeppelin/contracts/utils/Address.sol"; | |
import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; | |
/** | |
* @title TrusterLenderPool | |
* @author Damn Vulnerable DeFi (https://damnvulnerabledefi.xyz) | |
*/ | |
contract TrusterLenderPool is ReentrancyGuard { | |
using Address for address; | |
IERC20 public immutable damnValuableToken; | |
constructor (address tokenAddress) { | |
damnValuableToken = IERC20(tokenAddress); | |
} | |
function flashLoan( | |
uint256 borrowAmount, | |
address borrower, | |
address target, | |
bytes calldata data | |
) | |
external | |
nonReentrant | |
{ | |
uint256 balanceBefore = damnValuableToken.balanceOf(address(this)); | |
require(balanceBefore >= borrowAmount, "Not enough tokens in pool"); | |
damnValuableToken.transfer(borrower, borrowAmount); | |
target.functionCall(data); | |
uint256 balanceAfter = damnValuableToken.balanceOf(address(this)); | |
require(balanceAfter >= balanceBefore, "Flash loan hasn't been paid back"); | |
} | |
} |
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