Files
openzeppelin-contracts/contracts/mocks/token/ERC20ForceApproveMock.sol
2023-02-24 20:29:49 +00:00

14 lines
486 B
Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../token/ERC20/ERC20.sol";
// contract that replicate USDT (0xdac17f958d2ee523a2206206994597c13d831ec7) approval beavior
abstract contract ERC20ForceApproveMock is ERC20 {
function approve(address spender, uint256 amount) public virtual override returns (bool) {
require(amount == 0 || allowance(msg.sender, spender) == 0, "USDT approval failure");
return super.approve(spender, amount);
}
}