64 lines
1.6 KiB
Solidity
64 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 "../../lib/SafeMath.sol";
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import {IERC20} from "../../intf/IERC20.sol";
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import {SafeERC20} from "../../lib/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 ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
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function universalTransfer(
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IERC20 token,
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address payable to,
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uint256 amount
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) 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 universalApproveMax(
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IERC20 token,
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address to,
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uint256 amount
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) internal {
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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, uint256(-1));
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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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function tokenBalanceOf(IERC20 token, address who) internal view returns (uint256) {
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return token.balanceOf(who);
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}
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function isETH(IERC20 token) internal pure returns (bool) {
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return token == ETH_ADDRESS;
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}
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}
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