Address Contract Verified
Address
0xE8E1F50392Bd61D0F8F48E8E7aF51D3b8a52090a
Balance
0 ETH
Nonce
1
Code Size
6977 bytes
Creator
0x7D863941...64DD at tx 0xb8793378...601e87
Indexed Transactions
0
Contract Bytecode
6977 bytes
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Verified Source Code Full Match
Compiler: v0.6.6+commit.6c089d02
EVM: istanbul
Optimization: Yes (999999 runs)
ICore.sol 14 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
interface ICore {
// ----------- Getters -----------
function isBurner(address _address) external view returns (bool);
function isMinter(address _address) external view returns (bool);
function isGovernor(address _address) external view returns (bool);
function isGuardian(address _address) external view returns (bool);
}
ICoreRef.sol 14 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
import '../core/ICore.sol';
/// @title CoreRef interface
interface ICoreRef {
event CoreUpdate(address indexed _core);
function setCore(address coreAddress) external;
function pause() external;
function unpause() external;
function core() external view returns (ICore);
}
FewWrappedToken.sol 191 lines
// SPDX-License-Identifier: BUSL-1.1
pragma solidity =0.6.6;
import '@uniswap/lib/contracts/libraries/TransferHelper.sol';
import './interfaces/IFewWrappedToken.sol';
import './libraries/SafeMath.sol';
import './refs/ICoreRef.sol';
import './interfaces/IFewFactory.sol';
/// @title Few Wrapped Token
contract FewWrappedToken is IFewWrappedToken {
using SafeMath for uint;
string public override name;
string public override symbol;
uint8 public override decimals;
uint public override totalSupply;
mapping(address => uint) public override balanceOf;
mapping(address => mapping(address => uint)) public override allowance;
bytes32 public override DOMAIN_SEPARATOR;
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public override constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint) public override nonces;
address public override factory;
address public override token;
modifier onlyMinter() {
require(ICoreRef(factory).core().isMinter(msg.sender), "CoreRef: Caller is not a minter");
_;
}
modifier onlyBurner() {
require(ICoreRef(factory).core().isBurner(msg.sender), "CoreRef: Caller is not a burner");
_;
}
modifier whenNotPaused() {
require(!IFewFactory(factory).paused(), "CoreRef: Caller is paused");
_;
}
event Mint(address indexed minter, uint256 amount, address indexed to);
event Burn(address indexed burner, uint256 amount, address indexed to);
event Wrap(address indexed sender, uint256 amount, address indexed to);
event Unwrap(address indexed sender, uint256 amount, address indexed to);
/// @notice Few wrapped token constructor
constructor() public {
uint chainId;
assembly {
chainId := chainid()
}
factory = msg.sender;
token = IFewFactory(msg.sender).parameter();
name = string(abi.encodePacked("Few Wrapped ", IERC20(token).name()));
symbol = string(abi.encodePacked("fw", IERC20(token).symbol()));
decimals = IERC20(token).decimals();
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
keccak256(bytes(name)),
keccak256(bytes('1')),
chainId,
address(this)
)
);
}
function _mint(address to, uint value) internal {
totalSupply = totalSupply.add(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(address(0), to, value);
}
function _burn(address from, uint value) internal {
balanceOf[from] = balanceOf[from].sub(value);
totalSupply = totalSupply.sub(value);
emit Transfer(from, address(0), value);
}
function _approve(address owner, address spender, uint value) internal {
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
function _transfer(address from, address to, uint value) private {
balanceOf[from] = balanceOf[from].sub(value);
balanceOf[to] = balanceOf[to].add(value);
emit Transfer(from, to, value);
}
function approve(address spender, uint value) external override returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
function transfer(address to, uint value) external override returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint value) external override returns (bool) {
if (allowance[from][msg.sender] != uint(-1)) {
allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
}
_transfer(from, to, value);
return true;
}
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external override {
require(deadline >= block.timestamp, 'Few: EXPIRED');
bytes32 digest = keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
require(recoveredAddress != address(0) && recoveredAddress == owner, 'Few: INVALID_SIGNATURE');
_approve(owner, spender, value);
}
/// @notice mint Few wrapped tokens
/// @param account the account to mint to
/// @param amount the amount to mint
function mint(address account, uint256 amount)
external
override
onlyMinter
whenNotPaused
{
_mint(account, amount);
emit Mint(msg.sender, amount, account);
}
/// @notice burn Few wrapped tokens from caller
/// @param amount the amount to burn
function burn(uint256 amount) public override {
_burn(msg.sender, amount);
emit Burn(msg.sender, amount, msg.sender);
}
/// @notice burn Few wrapped tokens from specified account
/// @param account the account to burn from
/// @param amount the amount to burn
function burnFrom(address account, uint256 amount)
public
override
onlyBurner
whenNotPaused
{
_burn(account, amount);
emit Burn(msg.sender, amount, account);
}
/// @notice exchanges token to Few wrapped token
/// @param amount the amount to wrap
/// @param to wrapped token reciver address
function wrapTo(uint256 amount, address to) public override returns (uint256) {
require(amount > 0, "Few: can't wrap zero token");
TransferHelper.safeTransferFrom(token, msg.sender, address(this), amount);
_mint(to, amount);
emit Wrap(msg.sender, amount, to);
return amount;
}
function wrap(uint256 amount) external override returns (uint256) {
return wrapTo(amount, msg.sender);
}
/// @notice exchange Few wrapped token to token
/// @param amount the amount to unwrap
/// @param to token receiver address
function unwrapTo(uint256 amount, address to) public override returns (uint256) {
require(amount > 0, "Few: zero amount unwrap not allowed");
_burn(msg.sender, amount);
TransferHelper.safeTransfer(address(token), to, amount);
emit Unwrap(msg.sender, amount, to);
return amount;
}
function unwrap(uint256 amount) external override returns (uint256) {
return unwrapTo(amount, msg.sender);
}
}
IERC20.sol 17 lines
pragma solidity >=0.5.0;
interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
}
SafeMath.sol 17 lines
pragma solidity =0.6.6;
// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)
library SafeMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, 'ds-math-add-overflow');
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, 'ds-math-sub-underflow');
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
}
}
IFewERC20.sol 12 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
import './IERC20.sol';
interface IFewERC20 is IERC20 {
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}
IFewFactory.sol 13 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
interface IFewFactory {
event WrappedTokenCreated(address indexed originalToken, address wrappedToken, uint);
function getWrappedToken(address originalToken) external view returns (address wrappedToken);
function allWrappedTokens(uint) external view returns (address wrappedToken);
function parameter() external view returns (address);
function allWrappedTokensLength() external view returns (uint);
function paused() external view returns (bool);
function createToken(address originalToken) external returns (address wrappedToken);
}
IFewWrappedToken.sol 22 lines
// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;
import '../interfaces/IFewERC20.sol';
interface IFewWrappedToken is IFewERC20 {
event Mint(address indexed minter, uint256 amount, address indexed to);
event Burn(address indexed burner, uint256 amount, address indexed to);
event Wrap(address indexed sender, uint256 amount, address indexed to);
event Unwrap(address indexed sender, uint256 amount, address indexed to);
function factory() external view returns (address);
function token() external view returns (address);
function mint(address account, uint256 amount) external;
function burn(uint256 amount) external;
function burnFrom(address account, uint256 amount) external;
function wrapTo(uint256 amount, address to) external returns (uint256);
function wrap(uint256 amount) external returns (uint256);
function unwrapTo(uint256 amount, address to) external returns (uint256);
function unwrap(uint256 amount) external returns (uint256);
}
TransferHelper.sol 51 lines
// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.6.0;
// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
function safeApprove(
address token,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::safeApprove: approve failed'
);
}
function safeTransfer(
address token,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::safeTransfer: transfer failed'
);
}
function safeTransferFrom(
address token,
address from,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
require(
success && (data.length == 0 || abi.decode(data, (bool))),
'TransferHelper::transferFrom: transferFrom failed'
);
}
function safeTransferETH(address to, uint256 value) internal {
(bool success, ) = to.call{value: value}(new bytes(0));
require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
}
}
Read Contract
DOMAIN_SEPARATOR 0x3644e515 → bytes32
PERMIT_TYPEHASH 0x30adf81f → bytes32
allowance 0xdd62ed3e → uint256
balanceOf 0x70a08231 → uint256
decimals 0x313ce567 → uint8
factory 0xc45a0155 → address
name 0x06fdde03 → string
nonces 0x7ecebe00 → uint256
symbol 0x95d89b41 → string
token 0xfc0c546a → address
totalSupply 0x18160ddd → uint256
Write Contract 11 functions
These functions modify contract state and require a wallet transaction to execute.
approve 0x095ea7b3
address spender
uint256 value
returns: bool
burn 0x42966c68
uint256 amount
burnFrom 0x79cc6790
address account
uint256 amount
mint 0x40c10f19
address account
uint256 amount
permit 0xd505accf
address owner
address spender
uint256 value
uint256 deadline
uint8 v
bytes32 r
bytes32 s
transfer 0xa9059cbb
address to
uint256 value
returns: bool
transferFrom 0x23b872dd
address from
address to
uint256 value
returns: bool
unwrap 0xde0e9a3e
uint256 amount
returns: uint256
unwrapTo 0x5dbd6059
uint256 amount
address to
returns: uint256
wrap 0xea598cb0
uint256 amount
returns: uint256
wrapTo 0x26599850
uint256 amount
address to
returns: uint256
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