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ERC20Helper compatible with non-standard ERC20

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tracy
2024-02-27 11:01:15 +08:00
parent f701133a50
commit 18ff2242be
1 changed files with 34 additions and 3 deletions
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37
contracts/helper/ERC20Helper.sol
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@@ -16,6 +16,15 @@ interface IERC20ForCheck {
function allowance(address owner, address spender) external view returns (uint256);
}
interface IOldERC20ForCheck {
function decimals() external view returns (uint);
function name() external view returns (bytes32);
function symbol() external view returns (bytes32);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
}
contract ERC20Helper {
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) {
@@ -27,16 +36,38 @@ contract ERC20Helper {
allownance = _allownance;
isOk = true;
} catch {
isOk = false;
try this.judgeOldERC20(token, user, spender) returns (bytes32 _symbol, bytes32 _name, uint _decimals, uint256 _balance, uint256 _allownance) {
symbol = bytes32ToString(_symbol);
name = bytes32ToString(_name);
decimals = _decimals;
balance = _balance;
allownance = _allownance;
isOk = true;
} catch {
isOk = false;
}
}
}
function judgeERC20(address token, address user, address spender) external view returns(string memory symbol, string memory name, uint decimals, uint256 balance, uint256 allownance) {
function judgeERC20(address token, address user, address spender) external view returns(string memory symbol, string memory name, uint decimals, uint256 balance, uint256 allownance) {
name = IERC20ForCheck(token).name();
symbol = IERC20ForCheck(token).symbol();
decimals = IERC20ForCheck(token).decimals();
balance = IERC20ForCheck(token).balanceOf(user);
allownance = IERC20ForCheck(token).allowance(user,spender);
}
}
function judgeOldERC20(address token, address user, address spender) external view returns(bytes32 symbol, bytes32 name, uint decimals, uint256 balance, uint256 allownance) {
name = IOldERC20ForCheck(token).name();
symbol = IOldERC20ForCheck(token).symbol();
decimals = IOldERC20ForCheck(token).decimals();
balance = IOldERC20ForCheck(token).balanceOf(user);
allownance = IOldERC20ForCheck(token).allowance(user,spender);
}
function bytes32ToString(bytes32 _bytes) public pure returns (string memory _string) {
_string = string(abi.encodePacked(_bytes));
}
}