/
VaultAttack.sol
49 lines (38 loc) · 1.18 KB
/
VaultAttack.sol
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pragma solidity ^0.5.0;
contract ERC20 {
function transferFrom(address from, address to, uint amount)
public returns (bool);
function transfer(address to, uint amount) public returns (bool);
}
contract VaultAttack {
mapping (address => mapping (address => uint)) private balances;
bool private duringDeposit;
// ERC20 (requires approval)
function deposit(ERC20 erc20, uint amount) external {
require(
erc20.transferFrom(msg.sender, address(this), amount),
"transferFrom failed"
);
balances[address(erc20)][msg.sender] += amount;
}
function withdraw(ERC20 erc20, uint amount) external {
require(
balances[address(erc20)][msg.sender] >= amount,
"inssuficent balance"
);
balances[address(erc20)][msg.sender] -= amount;
require(erc20.transfer(msg.sender, amount), "transfer failed");
}
// ERC223 / ERC677 compatibility
function tokenFallback(address from, uint amount, bytes memory data)
public returns (bytes4)
{
balances[msg.sender][from] += amount;
return 0xc0ee0b8a;
}
function getBalance(address token, address account)
public view returns (uint256)
{
return balances[token][account];
}
}