69 lines
1.8 KiB
Solidity
69 lines
1.8 KiB
Solidity
// SPDX-License-Identifier: GPL-3.0-or-later
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pragma solidity ^0.8.30;
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import {NativeWrapper} from "../src/NativeWrapper.sol";
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contract WETH9 is NativeWrapper {
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string public name = "Wrapped Ether";
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string public symbol = "WETH";
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uint8 public decimals = 18;
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event Deposit(address indexed dst, uint256 wad);
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event Withdrawal(address indexed src, uint256 wad);
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mapping(address => uint256) public balanceOf;
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mapping(address => mapping(address => uint256)) public allowance;
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receive() external payable {
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deposit();
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}
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function deposit() public payable {
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balanceOf[msg.sender] += msg.value;
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emit Deposit(msg.sender, msg.value);
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}
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function withdraw(uint256 wad) public {
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require(balanceOf[msg.sender] >= wad, "");
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balanceOf[msg.sender] -= wad;
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payable(msg.sender).transfer(wad);
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emit Withdrawal(msg.sender, wad);
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}
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function totalSupply() public view returns (uint256) {
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return address(this).balance;
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}
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function approve(address guy, uint256 wad) public returns (bool) {
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allowance[msg.sender][guy] = wad;
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emit Approval(msg.sender, guy, wad);
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return true;
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}
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function transfer(address dst, uint256 wad) public returns (bool) {
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return transferFrom(msg.sender, dst, wad);
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}
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function transferFrom(
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address src,
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address dst,
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uint256 wad
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) public returns (bool) {
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require(balanceOf[src] >= wad, "");
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if (
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src != msg.sender && allowance[src][msg.sender] != type(uint256).max
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) {
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require(allowance[src][msg.sender] >= wad, "");
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allowance[src][msg.sender] -= wad;
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}
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balanceOf[src] -= wad;
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balanceOf[dst] += wad;
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emit Transfer(src, dst, wad);
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return true;
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}
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}
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