133 lines
3.5 KiB
Solidity
133 lines
3.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.6.0;
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import "../GSN/Context.sol";
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import "../token/ERC20/IERC20.sol";
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import "../token/ERC20/SafeERC20.sol";
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contract ERC20ReturnFalseMock is Context {
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uint256 private _allowance;
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// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
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// we write to a dummy state variable.
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uint256 private _dummy;
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function transfer(address, uint256) public returns (bool) {
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_dummy = 0;
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return false;
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}
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function transferFrom(address, address, uint256) public returns (bool) {
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_dummy = 0;
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return false;
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}
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function approve(address, uint256) public returns (bool) {
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_dummy = 0;
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return false;
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}
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function allowance(address, address) public view returns (uint256) {
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require(_dummy == 0); // Duummy read from a state variable so that the function is view
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return 0;
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}
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}
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contract ERC20ReturnTrueMock is Context {
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mapping (address => uint256) private _allowances;
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// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
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// we write to a dummy state variable.
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uint256 private _dummy;
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function transfer(address, uint256) public returns (bool) {
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_dummy = 0;
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return true;
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}
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function transferFrom(address, address, uint256) public returns (bool) {
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_dummy = 0;
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return true;
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}
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function approve(address, uint256) public returns (bool) {
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_dummy = 0;
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return true;
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}
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function setAllowance(uint256 allowance_) public {
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_allowances[_msgSender()] = allowance_;
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}
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function allowance(address owner, address) public view returns (uint256) {
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return _allowances[owner];
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}
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}
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contract ERC20NoReturnMock is Context {
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mapping (address => uint256) private _allowances;
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// IERC20's functions are not pure, but these mock implementations are: to prevent Solidity from issuing warnings,
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// we write to a dummy state variable.
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uint256 private _dummy;
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function transfer(address, uint256) public {
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_dummy = 0;
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}
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function transferFrom(address, address, uint256) public {
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_dummy = 0;
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}
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function approve(address, uint256) public {
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_dummy = 0;
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}
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function setAllowance(uint256 allowance_) public {
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_allowances[_msgSender()] = allowance_;
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}
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function allowance(address owner, address) public view returns (uint256) {
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return _allowances[owner];
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}
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}
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contract SafeERC20Wrapper is Context {
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using SafeERC20 for IERC20;
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IERC20 private _token;
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constructor (IERC20 token) public {
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_token = token;
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}
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function transfer() public {
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_token.safeTransfer(address(0), 0);
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}
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function transferFrom() public {
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_token.safeTransferFrom(address(0), address(0), 0);
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}
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function approve(uint256 amount) public {
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_token.safeApprove(address(0), amount);
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}
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function increaseAllowance(uint256 amount) public {
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_token.safeIncreaseAllowance(address(0), amount);
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}
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function decreaseAllowance(uint256 amount) public {
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_token.safeDecreaseAllowance(address(0), amount);
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}
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function setAllowance(uint256 allowance_) public {
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ERC20ReturnTrueMock(address(_token)).setAllowance(allowance_);
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}
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function allowance() public view returns (uint256) {
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return _token.allowance(address(0), address(0));
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}
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}
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