├── .github └── workflows │ └── test.yml ├── .gitignore ├── .gitmodules ├── LICENSE-APACHE ├── LICENSE-GPLv3 ├── LICENSE-MIT ├── README.md ├── foundry.toml ├── script └── DeployMevWeth.s.sol └── src ├── IMevWeth.sol ├── MevWeth.sol ├── Mevitize.sol └── Weth10Mod.sol /.github/workflows/test.yml: -------------------------------------------------------------------------------- 1 | name: test 2 | 3 | on: workflow_dispatch 4 | 5 | env: 6 | FOUNDRY_PROFILE: ci 7 | 8 | jobs: 9 | check: 10 | strategy: 11 | fail-fast: true 12 | 13 | name: Foundry project 14 | runs-on: ubuntu-latest 15 | steps: 16 | - uses: actions/checkout@v3 17 | with: 18 | submodules: recursive 19 | 20 | - name: Install Foundry 21 | uses: foundry-rs/foundry-toolchain@v1 22 | with: 23 | version: nightly 24 | 25 | - name: Run Forge build 26 | run: | 27 | forge --version 28 | forge build --sizes 29 | id: build 30 | 31 | - name: Run Forge tests 32 | run: | 33 | forge test -vvv 34 | id: test 35 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiler files 2 | cache/ 3 | out/ 4 | 5 | # Ignores development broadcast logs 6 | !/broadcast 7 | /broadcast/*/31337/ 8 | /broadcast/**/dry-run/ 9 | 10 | # Dotenv file 11 | .env 12 | -------------------------------------------------------------------------------- /.gitmodules: -------------------------------------------------------------------------------- 1 | [submodule "lib/forge-std"] 2 | path = lib/forge-std 3 | url = https://github.com/foundry-rs/forge-std 4 | branch = v1.2.0 5 | [submodule "lib/WETH10"] 6 | path = lib/WETH10 7 | url = https://github.com/WETH10/WETH10 8 | -------------------------------------------------------------------------------- /LICENSE-APACHE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. 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But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /LICENSE-MIT: -------------------------------------------------------------------------------- 1 | Copyright (c) 2022 2 | 3 | Permission is hereby granted, free of charge, to any 4 | person obtaining a copy of this software and associated 5 | documentation files (the "Software"), to deal in the 6 | Software without restriction, including without 7 | limitation the rights to use, copy, modify, merge, 8 | publish, distribute, sublicense, and/or sell copies of 9 | the Software, and to permit persons to whom the Software 10 | is furnished to do so, subject to the following 11 | conditions: 12 | 13 | The above copyright notice and this permission notice 14 | shall be included in all copies or substantial portions 15 | of the Software. 16 | 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF 18 | ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 19 | TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 20 | PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT 21 | SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 22 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 24 | IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 | DEALINGS IN THE SOFTWARE. 26 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # MevWeth 2 | 3 | - MevWeth: A Weth10 variant that allows users to create explicit MEV. 4 | - Mevitize: A simple, inheritable contract for adding Mev to transaction using 5 | MevWeth 6 | 7 | THIS IS UNAUDITED CODE. USE AT YOUR OWN RISK 8 | 9 | ## What is explicit MEV? 10 | 11 | Explicit MEV is MEV that is produced intentionally, to achieve a specific 12 | result. In order to simplify & standardize this process, it's useful to have a 13 | separate accounting system. I.e. to separate funds that ought be used for 14 | explicit MEV from funds that ought not be. This allows contracts and users to 15 | operate normally, while delegating intentional MEV creation to another system. 16 | 17 | In other words, a lending market could use `MevWeth` to add MEV to a Weth market, without having to worry about mixing its MevWeth with its Weth. 18 | 19 | ### Addresses 20 | 21 | - MevWeth: `0x00000000008C43efC014746c230049e330039Cb3` 22 | 23 | ## FAQ: 24 | 25 | ### Why would someone produce explicit MEV? 26 | 27 | Why indeed? Here are a few cases where MEV could be used to automate 28 | transactions: 29 | 30 | - My lending protocol needs to be poked to calculate its interest properly. 31 | - My on-chain oracle needs to be updated every so often 32 | - I don't want to figure out what the current priority fee is 33 | - I have a tx that must be broadcast on a specific schedule, but I won't be 34 | online to do it 35 | - I am making a big slippery AMM trade, and I want to add -25,000 gwei MEV, so 36 | that I get some of my slippage back 37 | 38 | #### Is MevWeth maintained? 39 | 40 | Not really. It's a static deployment. The code will not be updated or upgraded. 41 | The `Mevitize` base contract is maintained, may be updated in the future. 42 | 43 | #### Is MevWeth audited? 44 | 45 | No, and there is no plan to audit it. 46 | 47 | #### Are there tests for MevWeth? 48 | 49 | No. But there probably will be soon. Next time I have some free time. Or you can 50 | open a pull request! 51 | 52 | #### How is MevWeth licensed? 53 | 54 | `MevWeth` is a derivative work of `WETH10`, and is released solely under the 55 | GPLv3 license. Derivates of `MevWeth` must be released under the same license. 56 | 57 | `Mevitize` and the `IMevWeth` interface are licensed under the user's choice of 58 | GPLv3, MIT, or Apache2.0. These ARE NOT derivative works of `WETH10`. If you 59 | wish to call `MevWeth` from other contracts, but do not need its bytecode or 60 | non-MEV interface, consider using `IMevWeth` or inheriting `Mevitize`. 61 | 62 | #### What chains is MevWeth on? 63 | 64 | - Ethereum mainnet 65 | 66 | #### I want MevWeth on my chain! 67 | 68 | `MevWeth` uses forge to deploy. It can be used on any chain where the forge 69 | create2 deployer exists. Just run `forge script DeployMevWeth`, and add your 70 | signer info. 71 | 72 | If the create2factory is not deployed on your chain, here are the instructions! 73 | 74 | 1. Fund the create2factory deployer (don't really use 0.5 ether probably) 75 | 76 | - `$ cast send --value 0.5ether 0x3fab184622dc19b6109349b94811493bf2a45362` 77 | 78 | 2. Deploy the create2factory 79 | 80 | - `cast publish 0xf8a58085174876e800830186a08080b853604580600e600039806000f350fe7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe03601600081602082378035828234f58015156039578182fd5b8082525050506014600cf31ba02222222222222222222222222222222222222222222222222222222222222222a02222222222222222222222222222222222222222222222222222222222222222` 81 | 82 | 3. Continue with your life :) 83 | -------------------------------------------------------------------------------- /foundry.toml: -------------------------------------------------------------------------------- 1 | [profile.default] 2 | src = 'src' 3 | out = 'out' 4 | libs = ['lib'] 5 | 6 | # See more config options https://github.com/foundry-rs/foundry/tree/master/config -------------------------------------------------------------------------------- /script/DeployMevWeth.s.sol: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: UNLICENSED 2 | pragma solidity ^0.7.6; 3 | 4 | import "forge-std/Script.sol"; 5 | 6 | import {MevWeth} from "../src/MevWeth.sol"; 7 | 8 | contract DeployMevWeth is Script { 9 | // Produces: 10 | // 0x00000000008C43efC014746c230049e330039Cb3 11 | // Using forge create2factory 12 | bytes32 constant salt = 0x13061f1c1bbc52beabac07a60520c45cf18845c922387ca542de860049e90910; 13 | 14 | // Just for convenience pre-grinding :) 15 | event codehash(bytes32); 16 | 17 | function setUp() public {} 18 | 19 | function run() public { 20 | vm.broadcast(); 21 | new MevWeth{salt: salt}(); 22 | emit codehash(keccak256(type(MevWeth).creationCode)); 23 | } 24 | } -------------------------------------------------------------------------------- /src/IMevWeth.sol: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: Apache-2.0 OR MIT OR GPL-3.0-or-later 2 | pragma solidity >=0.6.0 <0.9.0; 3 | 4 | interface IMevWeth { 5 | function mev() external returns (uint256); 6 | function addMev(uint256 value) external; 7 | function addMev(address from, uint256 value) external; 8 | function getMev() external; 9 | function getMev(uint256 value) external; 10 | function getMev(address to) external; 11 | function getMev(address to, uint256 value) external; 12 | } 13 | -------------------------------------------------------------------------------- /src/MevWeth.sol: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: GPL-3.0-or-later 2 | pragma solidity ^0.7.6; 3 | 4 | import {WETH10} from "./WETH10Mod.sol"; 5 | import {IMevWeth} from "./IMevWeth.sol"; 6 | 7 | contract MevWeth is WETH10, IMevWeth { 8 | uint256 public override mev; 9 | 10 | function addMev(uint256 value) external override { 11 | // _burnFrom(msg.sender, value); 12 | uint256 balance = balanceOf[msg.sender]; 13 | require(balance >= value, "WETH: burn amount exceeds balance"); 14 | balanceOf[msg.sender] = balance - value; 15 | emit Transfer(msg.sender, address(this), value); 16 | // add mev 17 | mev += value; 18 | } 19 | 20 | function addMev(address from, uint256 value) external override { 21 | if (from != msg.sender) { 22 | // _decreaseAllowance(from, msg.sender, value); 23 | uint256 allowed = allowance[from][msg.sender]; 24 | if (allowed != type(uint256).max) { 25 | require(allowed >= value, "WETH: request exceeds allowance"); 26 | uint256 reduced = allowed - value; 27 | allowance[from][msg.sender] = reduced; 28 | emit Approval(from, msg.sender, reduced); 29 | } 30 | } 31 | // _burnFrom(msg.sender, value); 32 | uint256 balance = balanceOf[from]; 33 | require(balance >= value, "WETH: burn amount exceeds balance"); 34 | balanceOf[from] = balance - value; 35 | emit Transfer(from, address(this), value); 36 | // add mev 37 | mev += value; 38 | } 39 | 40 | function getMev() external override { 41 | uint256 current = mev; 42 | balanceOf[msg.sender] += current; 43 | delete mev; 44 | emit Transfer(address(this), msg.sender, current); 45 | } 46 | 47 | function getMev(uint256 value) external override { 48 | uint256 current = mev; 49 | require(current >= value); 50 | balanceOf[msg.sender] += value; 51 | mev = current - value; 52 | emit Transfer(address(this), msg.sender, value); 53 | } 54 | 55 | function getMev(address to) external override { 56 | uint256 current = mev; 57 | balanceOf[to] += current; 58 | delete mev; 59 | emit Transfer(address(this), to, current); 60 | } 61 | 62 | function getMev(address to, uint256 value) external override { 63 | uint256 current = mev; 64 | require(current >= value); 65 | balanceOf[to] += value; 66 | mev = current - value; 67 | emit Transfer(address(this), to, value); 68 | } 69 | } 70 | -------------------------------------------------------------------------------- /src/Mevitize.sol: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: Apache-2.0 OR MIT OR GPL-3.0-or-later 2 | pragma solidity ^0.8.17; 3 | 4 | import {IMevWeth} from "./IMevWeth.sol"; 5 | 6 | contract Mevitize { 7 | IMevWeth constant mevWeth = IMevWeth(0x00000000008C43efC014746c230049e330039Cb3); 8 | 9 | error ExactBaseFee(); // 0x2daf442d 10 | 11 | modifier mev(int256 loot) { 12 | if (loot > 0) { 13 | mevWeth.addMev(uint256(loot)); 14 | } else { 15 | mevWeth.getMev(uint256(-1 * loot)); 16 | } 17 | _; 18 | } 19 | 20 | modifier mevFrom(address from, int256 loot) { 21 | if (loot > 0) { 22 | mevWeth.addMev(from, uint256(loot)); 23 | } else { 24 | mevWeth.getMev(from, uint256(-1 * loot)); 25 | } 26 | _; 27 | } 28 | 29 | modifier subsidize(int256 tip) { 30 | uint256 gp = tx.gasprice; 31 | uint256 bf = block.basefee; 32 | if (bf != gp) revert ExactBaseFee(); // this asserts that there is no tip 33 | uint256 pre = gasleft(); 34 | _; 35 | uint256 post = gasleft(); 36 | int256 loot = tip + int256(gp * (pre - post)); 37 | if (loot > 0) { 38 | mevWeth.addMev(uint256(loot)); 39 | } else { 40 | mevWeth.getMev(uint256(-1 * loot)); 41 | } 42 | } 43 | 44 | modifier subsidizeFrom(address from, int256 tip) { 45 | uint256 gp = tx.gasprice; 46 | uint256 bf = block.basefee; 47 | if (bf != gp) revert ExactBaseFee(); // this asserts that there is no tip 48 | uint256 pre = gasleft(); 49 | _; 50 | uint256 post = gasleft(); 51 | int256 loot = tip + int256(gp * (pre - post)); 52 | if (loot > 0) { 53 | mevWeth.addMev(from, uint256(loot)); 54 | } else { 55 | mevWeth.getMev(from, uint256(-1 * loot)); 56 | } 57 | } 58 | } 59 | -------------------------------------------------------------------------------- /src/Weth10Mod.sol: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: GPL-3.0-or-later 2 | // Copyright (C) 2015, 2016, 2017 Dapphub 3 | // Copyright (C) Weth10 Developers 2021 4 | // Copyright (C) 2022 James Prestwich 5 | 6 | 7 | // This file is a derivative of the excellent work on WETH10. 8 | // It modifies the original source under the terms of the GPLv3 license. 9 | // The modifications are as follows: 10 | // - imports 11 | // - name 12 | // - symbol 13 | 14 | pragma solidity 0.7.6; 15 | 16 | import "WETH10/interfaces/IWETH10.sol"; 17 | import "WETH10/interfaces/IERC3156FlashBorrower.sol"; 18 | 19 | interface ITransferReceiver { 20 | function onTokenTransfer(address, uint, bytes calldata) external returns (bool); 21 | } 22 | 23 | interface IApprovalReceiver { 24 | function onTokenApproval(address, uint, bytes calldata) external returns (bool); 25 | } 26 | 27 | /// @dev Wrapped Ether v10 (WETH10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain a WETH10 balance which can then be operated as an ERC-20 token. You can 28 | /// `withdraw` ETH from WETH10, which will then burn WETH10 token in your wallet. The amount of WETH10 token in any wallet is always identical to the 29 | /// balance of ETH deposited minus the ETH withdrawn with that specific wallet. 30 | contract WETH10 is IWETH10 { 31 | 32 | string public constant name = "Mev Weth"; 33 | string public constant symbol = "METH"; 34 | uint8 public constant decimals = 18; 35 | 36 | bytes32 public immutable CALLBACK_SUCCESS = keccak256("ERC3156FlashBorrower.onFlashLoan"); 37 | bytes32 public immutable PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); 38 | uint256 public immutable deploymentChainId; 39 | bytes32 private immutable _DOMAIN_SEPARATOR; 40 | 41 | /// @dev Records amount of WETH10 token owned by account. 42 | mapping (address => uint256) public override balanceOf; 43 | 44 | /// @dev Records current ERC2612 nonce for account. This value must be included whenever signature is generated for {permit}. 45 | /// Every successful call to {permit} increases account's nonce by one. This prevents signature from being used multiple times. 46 | mapping (address => uint256) public override nonces; 47 | 48 | /// @dev Records number of WETH10 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}. 49 | mapping (address => mapping (address => uint256)) public override allowance; 50 | 51 | /// @dev Current amount of flash-minted WETH10 token. 52 | uint256 public override flashMinted; 53 | 54 | constructor() { 55 | uint256 chainId; 56 | assembly {chainId := chainid()} 57 | deploymentChainId = chainId; 58 | _DOMAIN_SEPARATOR = _calculateDomainSeparator(chainId); 59 | } 60 | 61 | /// @dev Calculate the DOMAIN_SEPARATOR. 62 | function _calculateDomainSeparator(uint256 chainId) private view returns (bytes32) { 63 | return keccak256( 64 | abi.encode( 65 | keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), 66 | keccak256(bytes(name)), 67 | keccak256(bytes("1")), 68 | chainId, 69 | address(this) 70 | ) 71 | ); 72 | } 73 | 74 | /// @dev Return the DOMAIN_SEPARATOR. 75 | function DOMAIN_SEPARATOR() external view override returns (bytes32) { 76 | uint256 chainId; 77 | assembly {chainId := chainid()} 78 | return chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId); 79 | } 80 | 81 | /// @dev Returns the total supply of WETH10 token as the ETH held in this contract. 82 | function totalSupply() external view override returns (uint256) { 83 | return address(this).balance + flashMinted; 84 | } 85 | 86 | /// @dev Fallback, `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance. 87 | /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to caller account. 88 | receive() external payable { 89 | // _mintTo(msg.sender, msg.value); 90 | balanceOf[msg.sender] += msg.value; 91 | emit Transfer(address(0), msg.sender, msg.value); 92 | } 93 | 94 | /// @dev `msg.value` of ETH sent to this contract grants caller account a matching increase in WETH10 token balance. 95 | /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to caller account. 96 | function deposit() external override payable { 97 | // _mintTo(msg.sender, msg.value); 98 | balanceOf[msg.sender] += msg.value; 99 | emit Transfer(address(0), msg.sender, msg.value); 100 | } 101 | 102 | /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance. 103 | /// Emits {Transfer} event to reflect WETH10 token mint of `msg.value` from `address(0)` to `to` account. 104 | function depositTo(address to) external override payable { 105 | // _mintTo(to, msg.value); 106 | balanceOf[to] += msg.value; 107 | emit Transfer(address(0), to, msg.value); 108 | } 109 | 110 | /// @dev `msg.value` of ETH sent to this contract grants `to` account a matching increase in WETH10 token balance, 111 | /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. 112 | /// Emits {Transfer} event. 113 | /// Returns boolean value indicating whether operation succeeded. 114 | /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. 115 | function depositToAndCall(address to, bytes calldata data) external override payable returns (bool success) { 116 | // _mintTo(to, msg.value); 117 | balanceOf[to] += msg.value; 118 | emit Transfer(address(0), to, msg.value); 119 | 120 | return ITransferReceiver(to).onTokenTransfer(msg.sender, msg.value, data); 121 | } 122 | 123 | /// @dev Return the amount of WETH10 token that can be flash-lent. 124 | function maxFlashLoan(address token) external view override returns (uint256) { 125 | return token == address(this) ? type(uint112).max - flashMinted : 0; // Can't underflow 126 | } 127 | 128 | /// @dev Return the fee (zero) for flash lending an amount of WETH10 token. 129 | function flashFee(address token, uint256) external view override returns (uint256) { 130 | require(token == address(this), "WETH: flash mint only WETH10"); 131 | return 0; 132 | } 133 | 134 | /// @dev Flash lends `value` WETH10 token to the receiver address. 135 | /// By the end of the transaction, `value` WETH10 token will be burned from the receiver. 136 | /// The flash-minted WETH10 token is not backed by real ETH, but can be withdrawn as such up to the ETH balance of this contract. 137 | /// Arbitrary data can be passed as a bytes calldata parameter. 138 | /// Emits {Approval} event to reflect reduced allowance `value` for this contract to spend from receiver account (`receiver`), 139 | /// unless allowance is set to `type(uint256).max` 140 | /// Emits two {Transfer} events for minting and burning of the flash-minted amount. 141 | /// Returns boolean value indicating whether operation succeeded. 142 | /// Requirements: 143 | /// - `value` must be less or equal to type(uint112).max. 144 | /// - The total of all flash loans in a tx must be less or equal to type(uint112).max. 145 | function flashLoan(IERC3156FlashBorrower receiver, address token, uint256 value, bytes calldata data) external override returns (bool) { 146 | require(token == address(this), "WETH: flash mint only WETH10"); 147 | require(value <= type(uint112).max, "WETH: individual loan limit exceeded"); 148 | flashMinted = flashMinted + value; 149 | require(flashMinted <= type(uint112).max, "WETH: total loan limit exceeded"); 150 | 151 | // _mintTo(address(receiver), value); 152 | balanceOf[address(receiver)] += value; 153 | emit Transfer(address(0), address(receiver), value); 154 | 155 | require( 156 | receiver.onFlashLoan(msg.sender, address(this), value, 0, data) == CALLBACK_SUCCESS, 157 | "WETH: flash loan failed" 158 | ); 159 | 160 | // _decreaseAllowance(address(receiver), address(this), value); 161 | uint256 allowed = allowance[address(receiver)][address(this)]; 162 | if (allowed != type(uint256).max) { 163 | require(allowed >= value, "WETH: request exceeds allowance"); 164 | uint256 reduced = allowed - value; 165 | allowance[address(receiver)][address(this)] = reduced; 166 | emit Approval(address(receiver), address(this), reduced); 167 | } 168 | 169 | // _burnFrom(address(receiver), value); 170 | uint256 balance = balanceOf[address(receiver)]; 171 | require(balance >= value, "WETH: burn amount exceeds balance"); 172 | balanceOf[address(receiver)] = balance - value; 173 | emit Transfer(address(receiver), address(0), value); 174 | 175 | flashMinted = flashMinted - value; 176 | return true; 177 | } 178 | 179 | /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to the same. 180 | /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. 181 | /// Requirements: 182 | /// - caller account must have at least `value` balance of WETH10 token. 183 | function withdraw(uint256 value) external override { 184 | // _burnFrom(msg.sender, value); 185 | uint256 balance = balanceOf[msg.sender]; 186 | require(balance >= value, "WETH: burn amount exceeds balance"); 187 | balanceOf[msg.sender] = balance - value; 188 | emit Transfer(msg.sender, address(0), value); 189 | 190 | // _transferEther(msg.sender, value); 191 | (bool success, ) = msg.sender.call{value: value}(""); 192 | require(success, "WETH: ETH transfer failed"); 193 | } 194 | 195 | /// @dev Burn `value` WETH10 token from caller account and withdraw matching ETH to account (`to`). 196 | /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from caller account. 197 | /// Requirements: 198 | /// - caller account must have at least `value` balance of WETH10 token. 199 | function withdrawTo(address payable to, uint256 value) external override { 200 | // _burnFrom(msg.sender, value); 201 | uint256 balance = balanceOf[msg.sender]; 202 | require(balance >= value, "WETH: burn amount exceeds balance"); 203 | balanceOf[msg.sender] = balance - value; 204 | emit Transfer(msg.sender, address(0), value); 205 | 206 | // _transferEther(to, value); 207 | (bool success, ) = to.call{value: value}(""); 208 | require(success, "WETH: ETH transfer failed"); 209 | } 210 | 211 | /// @dev Burn `value` WETH10 token from account (`from`) and withdraw matching ETH to account (`to`). 212 | /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`), 213 | /// unless allowance is set to `type(uint256).max` 214 | /// Emits {Transfer} event to reflect WETH10 token burn of `value` to `address(0)` from account (`from`). 215 | /// Requirements: 216 | /// - `from` account must have at least `value` balance of WETH10 token. 217 | /// - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account. 218 | function withdrawFrom(address from, address payable to, uint256 value) external override { 219 | if (from != msg.sender) { 220 | // _decreaseAllowance(from, msg.sender, value); 221 | uint256 allowed = allowance[from][msg.sender]; 222 | if (allowed != type(uint256).max) { 223 | require(allowed >= value, "WETH: request exceeds allowance"); 224 | uint256 reduced = allowed - value; 225 | allowance[from][msg.sender] = reduced; 226 | emit Approval(from, msg.sender, reduced); 227 | } 228 | } 229 | 230 | // _burnFrom(from, value); 231 | uint256 balance = balanceOf[from]; 232 | require(balance >= value, "WETH: burn amount exceeds balance"); 233 | balanceOf[from] = balance - value; 234 | emit Transfer(from, address(0), value); 235 | 236 | // _transferEther(to, value); 237 | (bool success, ) = to.call{value: value}(""); 238 | require(success, "WETH: Ether transfer failed"); 239 | } 240 | 241 | /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token. 242 | /// Emits {Approval} event. 243 | /// Returns boolean value indicating whether operation succeeded. 244 | function approve(address spender, uint256 value) external override returns (bool) { 245 | // _approve(msg.sender, spender, value); 246 | allowance[msg.sender][spender] = value; 247 | emit Approval(msg.sender, spender, value); 248 | 249 | return true; 250 | } 251 | 252 | /// @dev Sets `value` as allowance of `spender` account over caller account's WETH10 token, 253 | /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. 254 | /// Emits {Approval} event. 255 | /// Returns boolean value indicating whether operation succeeded. 256 | /// For more information on {approveAndCall} format, see https://github.com/ethereum/EIPs/issues/677. 257 | function approveAndCall(address spender, uint256 value, bytes calldata data) external override returns (bool) { 258 | // _approve(msg.sender, spender, value); 259 | allowance[msg.sender][spender] = value; 260 | emit Approval(msg.sender, spender, value); 261 | 262 | return IApprovalReceiver(spender).onTokenApproval(msg.sender, value, data); 263 | } 264 | 265 | /// @dev Sets `value` as allowance of `spender` account over `owner` account's WETH10 token, given `owner` account's signed approval. 266 | /// Emits {Approval} event. 267 | /// Requirements: 268 | /// - `deadline` must be timestamp in future. 269 | /// - `v`, `r` and `s` must be valid `secp256k1` signature from `owner` account over EIP712-formatted function arguments. 270 | /// - the signature must use `owner` account's current nonce (see {nonces}). 271 | /// - the signer cannot be `address(0)` and must be `owner` account. 272 | /// For more information on signature format, see https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP section]. 273 | /// WETH10 token implementation adapted from https://github.com/albertocuestacanada/ERC20Permit/blob/master/contracts/ERC20Permit.sol. 274 | function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override { 275 | require(block.timestamp <= deadline, "WETH: Expired permit"); 276 | 277 | uint256 chainId; 278 | assembly {chainId := chainid()} 279 | 280 | bytes32 hashStruct = keccak256( 281 | abi.encode( 282 | PERMIT_TYPEHASH, 283 | owner, 284 | spender, 285 | value, 286 | nonces[owner]++, 287 | deadline)); 288 | 289 | bytes32 hash = keccak256( 290 | abi.encodePacked( 291 | "\x19\x01", 292 | chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId), 293 | hashStruct)); 294 | 295 | address signer = ecrecover(hash, v, r, s); 296 | require(signer != address(0) && signer == owner, "WETH: invalid permit"); 297 | 298 | // _approve(owner, spender, value); 299 | allowance[owner][spender] = value; 300 | emit Approval(owner, spender, value); 301 | } 302 | 303 | /// @dev Moves `value` WETH10 token from caller's account to account (`to`). 304 | /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. 305 | /// Emits {Transfer} event. 306 | /// Returns boolean value indicating whether operation succeeded. 307 | /// Requirements: 308 | /// - caller account must have at least `value` WETH10 token. 309 | function transfer(address to, uint256 value) external override returns (bool) { 310 | // _transferFrom(msg.sender, to, value); 311 | if (to != address(0) && to != address(this)) { // Transfer 312 | uint256 balance = balanceOf[msg.sender]; 313 | require(balance >= value, "WETH: transfer amount exceeds balance"); 314 | 315 | balanceOf[msg.sender] = balance - value; 316 | balanceOf[to] += value; 317 | emit Transfer(msg.sender, to, value); 318 | } else { // Withdraw 319 | uint256 balance = balanceOf[msg.sender]; 320 | require(balance >= value, "WETH: burn amount exceeds balance"); 321 | balanceOf[msg.sender] = balance - value; 322 | emit Transfer(msg.sender, address(0), value); 323 | 324 | (bool success, ) = msg.sender.call{value: value}(""); 325 | require(success, "WETH: ETH transfer failed"); 326 | } 327 | 328 | return true; 329 | } 330 | 331 | /// @dev Moves `value` WETH10 token from account (`from`) to account (`to`) using allowance mechanism. 332 | /// `value` is then deducted from caller account's allowance, unless set to `type(uint256).max`. 333 | /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. 334 | /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`), 335 | /// unless allowance is set to `type(uint256).max` 336 | /// Emits {Transfer} event. 337 | /// Returns boolean value indicating whether operation succeeded. 338 | /// Requirements: 339 | /// - `from` account must have at least `value` balance of WETH10 token. 340 | /// - `from` account must have approved caller to spend at least `value` of WETH10 token, unless `from` and caller are the same account. 341 | function transferFrom(address from, address to, uint256 value) external override returns (bool) { 342 | if (from != msg.sender) { 343 | // _decreaseAllowance(from, msg.sender, value); 344 | uint256 allowed = allowance[from][msg.sender]; 345 | if (allowed != type(uint256).max) { 346 | require(allowed >= value, "WETH: request exceeds allowance"); 347 | uint256 reduced = allowed - value; 348 | allowance[from][msg.sender] = reduced; 349 | emit Approval(from, msg.sender, reduced); 350 | } 351 | } 352 | 353 | // _transferFrom(from, to, value); 354 | if (to != address(0) && to != address(this)) { // Transfer 355 | uint256 balance = balanceOf[from]; 356 | require(balance >= value, "WETH: transfer amount exceeds balance"); 357 | 358 | balanceOf[from] = balance - value; 359 | balanceOf[to] += value; 360 | emit Transfer(from, to, value); 361 | } else { // Withdraw 362 | uint256 balance = balanceOf[from]; 363 | require(balance >= value, "WETH: burn amount exceeds balance"); 364 | balanceOf[from] = balance - value; 365 | emit Transfer(from, address(0), value); 366 | 367 | (bool success, ) = msg.sender.call{value: value}(""); 368 | require(success, "WETH: ETH transfer failed"); 369 | } 370 | 371 | return true; 372 | } 373 | 374 | /// @dev Moves `value` WETH10 token from caller's account to account (`to`), 375 | /// after which a call is executed to an ERC677-compliant contract with the `data` parameter. 376 | /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WETH10 token in favor of caller. 377 | /// Emits {Transfer} event. 378 | /// Returns boolean value indicating whether operation succeeded. 379 | /// Requirements: 380 | /// - caller account must have at least `value` WETH10 token. 381 | /// For more information on {transferAndCall} format, see https://github.com/ethereum/EIPs/issues/677. 382 | function transferAndCall(address to, uint value, bytes calldata data) external override returns (bool) { 383 | // _transferFrom(msg.sender, to, value); 384 | if (to != address(0)) { // Transfer 385 | uint256 balance = balanceOf[msg.sender]; 386 | require(balance >= value, "WETH: transfer amount exceeds balance"); 387 | 388 | balanceOf[msg.sender] = balance - value; 389 | balanceOf[to] += value; 390 | emit Transfer(msg.sender, to, value); 391 | } else { // Withdraw 392 | uint256 balance = balanceOf[msg.sender]; 393 | require(balance >= value, "WETH: burn amount exceeds balance"); 394 | balanceOf[msg.sender] = balance - value; 395 | emit Transfer(msg.sender, address(0), value); 396 | 397 | (bool success, ) = msg.sender.call{value: value}(""); 398 | require(success, "WETH: ETH transfer failed"); 399 | } 400 | 401 | return ITransferReceiver(to).onTokenTransfer(msg.sender, value, data); 402 | } 403 | } 404 | --------------------------------------------------------------------------------