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AnyswapV6ERC20
- Verified, Router
- Router
Verified
The following smart contract is an implementation of the ERC20 token standard with additional functionality for swapping tokens. It includes features such as setting a vault address, adding and revoking minters, and swapping tokens in and out of the contract. The contract also uses SafeERC20 library for safe token transfers.
0x7b4328c127b85369d9f82ca0503b000d09cf9180
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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity ^0.8.2;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
function totalSupply() external view returns (uint256);
function decimals() external view returns (uint8);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library Address {
function isContract(address account) internal view returns (bool) {
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != 0x0 && codehash != accountHash);
}
}
library SafeERC20 {
using Address for address;
function safeTransfer(IERC20 token, address to, uint value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(IERC20 token, address spender, uint value) internal {
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function callOptionalReturn(IERC20 token, bytes memory data) private {
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
contract AnyswapV6ERC20 is IERC20 {
using SafeERC20 for IERC20;
string public name;
string public symbol;
uint8 public immutable override decimals;
address public immutable underlying;
bool public constant underlyingIsMinted = false;
/// @dev Records amount of AnyswapV6ERC20 token owned by account.
mapping (address => uint256) public override balanceOf;
uint256 private _totalSupply;
// init flag for setting immediate vault, needed for CREATE2 support
bool private _init;
// flag to enable/disable swapout vs vault.burn so multiple events are triggered
bool private _vaultOnly;
// delay for timelock functions
uint public constant DELAY = 2 days;
// set of minters, can be this bridge or other bridges
mapping(address => bool) public isMinter;
address[] public minters;
// primary controller of the token contract
address public vault;
address public pendingMinter;
uint public delayMinter;
address public pendingVault;
uint public delayVault;
modifier onlyAuth() {
require(isMinter[msg.sender], "AnyswapV6ERC20: FORBIDDEN");
_;
}
modifier onlyVault() {
require(msg.sender == vault, "AnyswapV6ERC20: FORBIDDEN");
_;
}
function owner() external view returns (address) {
return vault;
}
function mpc() external view returns (address) {
return vault;
}
function setVaultOnly(bool enabled) external onlyVault {
_vaultOnly = enabled;
}
function initVault(address _vault) external onlyVault {
require(_init);
_init = false;
vault = _vault;
isMinter[_vault] = true;
minters.push(_vault);
}
function setVault(address _vault) external onlyVault {
require(_vault != address(0), "AnyswapV6ERC20: address(0)");
pendingVault = _vault;
delayVault = block.timestamp + DELAY;
}
function applyVault() external onlyVault {
require(pendingVault != address(0) && block.timestamp >= delayVault);
vault = pendingVault;
pendingVault = address(0);
delayVault = 0;
}
function setMinter(address _auth) external onlyVault {
require(_auth != address(0), "AnyswapV6ERC20: address(0)");
pendingMinter = _auth;
delayMinter = block.timestamp + DELAY;
}
function applyMinter() external onlyVault {
require(pendingMinter != address(0) && block.timestamp >= delayMinter);
isMinter[pendingMinter] = true;
minters.push(pendingMinter);
pendingMinter = address(0);
delayMinter = 0;
}
// No time delay revoke minter emergency function
function revokeMinter(address _auth) external onlyVault {
isMinter[_auth] = false;
}
function getAllMinters() external view returns (address[] memory) {
return minters;
}
function changeVault(address newVault) external onlyVault returns (bool) {
require(newVault != address(0), "AnyswapV6ERC20: address(0)");
emit LogChangeVault(vault, newVault, block.timestamp);
vault = newVault;
pendingVault = address(0);
delayVault = 0;
return true;
}
function mint(address to, uint256 amount) external onlyAuth returns (bool) {
_mint(to, amount);
return true;
}
function burn(address from, uint256 amount) external onlyAuth returns (bool) {
_burn(from, amount);
return true;
}
function Swapin(bytes32 txhash, address account, uint256 amount) external onlyAuth returns (bool) {
if (underlying != address(0) && IERC20(underlying).balanceOf(address(this)) >= amount) {
IERC20(underlying).safeTransfer(account, amount);
} else {
_mint(account, amount);
}
emit LogSwapin(txhash, account, amount);
return true;
}
function Swapout(uint256 amount, address bindaddr) external returns (bool) {
require(!_vaultOnly, "AnyswapV6ERC20: vaultOnly");
require(bindaddr != address(0), "AnyswapV6ERC20: address(0)");
if (underlying != address(0) && balanceOf[msg.sender] < amount) {
IERC20(underlying).safeTransferFrom(msg.sender, address(this), amount);
} else {
_burn(msg.sender, amount);
}
emit LogSwapout(msg.sender, bindaddr, amount);
return true;
}
/// @dev Records number of AnyswapV6ERC20 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}.
mapping (address => mapping (address => uint256)) public override allowance;
event LogChangeVault(address indexed oldVault, address indexed newVault, uint indexed effectiveTime);
event LogSwapin(bytes32 indexed txhash, address indexed account, uint amount);
event LogSwapout(address indexed account, address indexed bindaddr, uint amount);
constructor(string memory _name, string memory _symbol, uint8 _decimals, address _underlying, address _vault) {
name = _name;
symbol = _symbol;
decimals = _decimals;
underlying = _underlying;
if (_underlying != address(0)) {
require(_decimals == IERC20(_underlying).decimals());
}
// Use init to allow for CREATE2 accross all chains
_init = true;
// Disable/Enable swapout for v1 tokens vs mint/burn for v3 tokens
_vaultOnly = false;
vault = _vault;
}
/// @dev Returns the total supply of AnyswapV6ERC20 token as the ETH held in this contract.
function totalSupply() external view override returns (uint256) {
return _totalSupply;
}
function deposit() external returns (uint) {
uint _amount = IERC20(underlying).balanceOf(msg.sender);
IERC20(underlying).safeTransferFrom(msg.sender, address(this), _amount);
return _deposit(_amount, msg.sender);
}
function deposit(uint amount) external returns (uint) {
IERC20(underlying).safeTransferFrom(msg.sender, address(this), amount);
return _deposit(amount, msg.sender);
}
function deposit(uint amount, address to) external returns (uint) {
IERC20(underlying).safeTransferFrom(msg.sender, address(this), amount);
return _deposit(amount, to);
}
function depositVault(uint amount, address to) external onlyVault returns (uint) {
return _deposit(amount, to);
}
function _deposit(uint amount, address to) internal returns (uint) {
require(!underlyingIsMinted);
require(underlying != address(0) && underlying != address(this));
_mint(to, amount);
return amount;
}
function withdraw() external returns (uint) {
return _withdraw(msg.sender, balanceOf[msg.sender], msg.sender);
}
function withdraw(uint amount) external returns (uint) {
return _withdraw(msg.sender, amount, msg.sender);
}
function withdraw(uint amount, address to) external returns (uint) {
return _withdraw(msg.sender, amount, to);
}
function withdrawVault(address from, uint amount, address to) external onlyVault returns (uint) {
return _withdraw(from, amount, to);
}
function _withdraw(address from, uint amount, address to) internal returns (uint) {
require(!underlyingIsMinted);
require(underlying != address(0) && underlying != address(this));
_burn(from, amount);
IERC20(underlying).safeTransfer(to, amount);
return amount;
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
balanceOf[account] += amount;
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
uint256 balance = balanceOf[account];
require(balance >= amount, "ERC20: burn amount exceeds balance");
balanceOf[account] = balance - amount;
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
}
/// @dev Sets `value` as allowance of `spender` account over caller account's AnyswapV6ERC20 token.
/// Emits {Approval} event.
/// Returns boolean value indicating whether operation succeeded.
function approve(address spender, uint256 value) external override returns (bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
/// @dev Moves `value` AnyswapV6ERC20 token from caller's account to account (`to`).
/// Emits {Transfer} event.
/// Returns boolean value indicating whether operation succeeded.
/// Requirements:
/// - caller account must have at least `value` AnyswapV6ERC20 token.
function transfer(address to, uint256 value) external override returns (bool) {
require(to != address(0) && to != address(this));
uint256 balance = balanceOf[msg.sender];
require(balance >= value, "AnyswapV6ERC20: transfer amount exceeds balance");
balanceOf[msg.sender] = balance - value;
balanceOf[to] += value;
emit Transfer(msg.sender, to, value);
return true;
}
/// @dev Moves `value` AnyswapV6ERC20 token from account (`from`) to account (`to`) using allowance mechanism.
/// `value` is then deducted from caller account's allowance, unless set to `type(uint256).max`.
/// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`),
/// unless allowance is set to `type(uint256).max`
/// Emits {Transfer} event.
/// Returns boolean value indicating whether operation succeeded.
/// Requirements:
/// - `from` account must have at least `value` balance of AnyswapV6ERC20 token.
/// - `from` account must have approved caller to spend at least `value` of AnyswapV6ERC20 token, unless `from` and caller are the same account.
function transferFrom(address from, address to, uint256 value) external override returns (bool) {
require(to != address(0) && to != address(this));
if (from != msg.sender) {
uint256 allowed = allowance[from][msg.sender];
if (allowed != type(uint256).max) {
require(allowed >= value, "AnyswapV6ERC20: request exceeds allowance");
uint256 reduced = allowed - value;
allowance[from][msg.sender] = reduced;
emit Approval(from, msg.sender, reduced);
}
}
uint256 balance = balanceOf[from];
require(balance >= value, "AnyswapV6ERC20: transfer amount exceeds balance");
balanceOf[from] = balance - value;
balanceOf[to] += value;
emit Transfer(from, to, value);
return true;
}
}AnyswapV6ERC20 ABI
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Bytecode
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