59 lines
1.6 KiB
Solidity
59 lines
1.6 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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import {SafeMath} from "./SafeMath.sol";
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import {IERC20} from "../intf/IERC20.sol";
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import {SafeERC20} from "./SafeERC20.sol";
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library UniversalERC20 {
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using SafeMath for uint256;
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using SafeERC20 for IERC20;
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IERC20 private constant ZERO_ADDRESS = IERC20(0x0000000000000000000000000000000000000000);
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IERC20 private constant ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
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function isETH(IERC20 token) internal pure returns (bool) {
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return (token == ZERO_ADDRESS || token == ETH_ADDRESS);
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}
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function universalTransfer(IERC20 token, address payable to, uint256 amount) internal {
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if (amount > 0) {
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if (isETH(token)) {
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to.transfer(amount);
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} else {
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token.safeTransfer(to, amount);
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}
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}
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}
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function universalApprove(IERC20 token, address to, uint256 amount) internal {
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require(!isETH(token), "ETH Don't need approve");
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if (amount == 0) {
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token.safeApprove(to, 0);
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} else {
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uint256 allowance = token.allowance(address(this), to);
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if (allowance < amount) {
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if (allowance > 0) {
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token.safeApprove(to, 0);
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}
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token.safeApprove(to, amount);
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}
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}
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}
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function universalBalanceOf(IERC20 token, address who) internal view returns (uint256) {
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if (isETH(token)) {
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return who.balance;
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} else {
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return token.balanceOf(who);
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}
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}
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}
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