42 lines
1.5 KiB
Solidity
42 lines
1.5 KiB
Solidity
/*
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Copyright 2021 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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interface IERC20ForCheck {
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function decimals() external view returns (uint);
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function name() external view returns (string memory);
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function symbol() external view returns (string memory);
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function balanceOf(address account) external view returns (uint256);
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function allowance(address owner, address spender) external view returns (uint256);
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}
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contract ERC20Helper {
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function isERC20(address token, address user, address spender) external view returns(bool isOk, string memory symbol, string memory name, uint decimals, uint256 balance, uint256 allownance) {
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try this.judgeERC20(token, user, spender) returns (string memory _symbol, string memory _name, uint _decimals, uint256 _balance, uint256 _allownance) {
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symbol = _symbol;
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name = _name;
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decimals = _decimals;
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balance = _balance;
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allownance = _allownance;
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isOk = true;
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} catch {
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isOk = false;
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}
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}
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function judgeERC20(address token, address user, address spender) external view returns(string memory symbol, string memory name, uint decimals, uint256 balance, uint256 allownance) {
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name = IERC20ForCheck(token).name();
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symbol = IERC20ForCheck(token).symbol();
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decimals = IERC20ForCheck(token).decimals();
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balance = IERC20ForCheck(token).balanceOf(user);
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allownance = IERC20ForCheck(token).allowance(user,spender);
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}
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} |