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contract UnstoppableLender is ReentrancyGuard { | |
... | |
function depositTokens(uint256 amount) external nonReentrant { | |
require(amount > 0, "Must deposit at least one token"); | |
// Transfer token from sender. Sender must have first approved them. | |
damnValuableToken.transferFrom(msg.sender, address(this), amount); | |
poolBalance = poolBalance + amount; | |
} | |
function flashLoan(uint256 borrowAmount) external nonReentrant { | |
require(borrowAmount > 0, "Must borrow at least one token"); | |
uint256 balanceBefore = damnValuableToken.balanceOf(address(this)); | |
require(balanceBefore >= borrowAmount, "Not enough tokens in pool"); | |
// Ensured by the protocol via the `depositTokens` function | |
assert(poolBalance == balanceBefore); | |
damnValuableToken.transfer(msg.sender, borrowAmount); | |
IReceiver(msg.sender).receiveTokens(address(damnValuableToken), borrowAmount); | |
uint256 balanceAfter = damnValuableToken.balanceOf(address(this)); | |
require(balanceAfter >= balanceBefore, "Flash loan hasn't been paid back"); | |
} | |
} |
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