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SafeERC20Helper.sol
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SafeERC20Helper.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.sol";
import "../token/ERC20/IERC20.sol";
import "../token/ERC20/extensions/draft-ERC20Permit.sol";
import "../token/ERC20/utils/SafeERC20.sol";
contract ERC20ReturnFalseMock is Context {
uint256 private _allowance;
// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
// we write to a dummy state variable.
uint256 private _dummy;
function transfer(address, uint256) public returns (bool) {
_dummy = 0;
return false;
}
function transferFrom(
address,
address,
uint256
) public returns (bool) {
_dummy = 0;
return false;
}
function approve(address, uint256) public returns (bool) {
_dummy = 0;
return false;
}
function allowance(address, address) public view returns (uint256) {
require(_dummy == 0); // Dummy read from a state variable so that the function is view
return 0;
}
}
contract ERC20ReturnTrueMock is Context {
mapping(address => uint256) private _allowances;
// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
// we write to a dummy state variable.
uint256 private _dummy;
function transfer(address, uint256) public returns (bool) {
_dummy = 0;
return true;
}
function transferFrom(
address,
address,
uint256
) public returns (bool) {
_dummy = 0;
return true;
}
function approve(address, uint256) public returns (bool) {
_dummy = 0;
return true;
}
function setAllowance(uint256 allowance_) public {
_allowances[_msgSender()] = allowance_;
}
function allowance(address owner, address) public view returns (uint256) {
return _allowances[owner];
}
}
contract ERC20NoReturnMock is Context {
mapping(address => uint256) private _allowances;
// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
// we write to a dummy state variable.
uint256 private _dummy;
function transfer(address, uint256) public {
_dummy = 0;
}
function transferFrom(
address,
address,
uint256
) public {
_dummy = 0;
}
function approve(address, uint256) public {
_dummy = 0;
}
function setAllowance(uint256 allowance_) public {
_allowances[_msgSender()] = allowance_;
}
function allowance(address owner, address) public view returns (uint256) {
return _allowances[owner];
}
}
contract ERC20PermitNoRevertMock is
ERC20("ERC20PermitNoRevertMock", "ERC20PermitNoRevertMock"),
ERC20Permit("ERC20PermitNoRevertMock")
{
function getChainId() external view returns (uint256) {
return block.chainid;
}
function permitThatMayRevert(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual {
super.permit(owner, spender, value, deadline, v, r, s);
}
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public virtual override {
try this.permitThatMayRevert(owner, spender, value, deadline, v, r, s) {
// do nothing
} catch {
// do nothing
}
}
}
contract SafeERC20Wrapper is Context {
using SafeERC20 for IERC20;
IERC20 private _token;
constructor(IERC20 token) {
_token = token;
}
function transfer() public {
_token.safeTransfer(address(0), 0);
}
function transferFrom() public {
_token.safeTransferFrom(address(0), address(0), 0);
}
function approve(uint256 amount) public {
_token.safeApprove(address(0), amount);
}
function increaseAllowance(uint256 amount) public {
_token.safeIncreaseAllowance(address(0), amount);
}
function decreaseAllowance(uint256 amount) public {
_token.safeDecreaseAllowance(address(0), amount);
}
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) public {
SafeERC20.safePermit(IERC20Permit(address(_token)), owner, spender, value, deadline, v, r, s);
}
function setAllowance(uint256 allowance_) public {
ERC20ReturnTrueMock(address(_token)).setAllowance(allowance_);
}
function allowance() public view returns (uint256) {
return _token.allowance(address(0), address(0));
}
}