Contract Source Code:
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity 0.7.4;
import "./openzeppelin/WrappedERC20.sol";
import "./interfaces/IWETH.sol";
import "./libraries/SafeMath.sol";
import "./interfaces/IFloorCalculator.sol";
interface IERC31337BNB is IWrappedERC20
{
function floorCalculator() external view returns (IFloorCalculator);
function sweepers(address _sweeper) external view returns (bool);
function setFloorCalculator(IFloorCalculator _floorCalculator) external;
function setSweeper(address _sweeper, bool _allow) external;
function sweepFloor(address _to) external returns (uint256 amountSwept);
}
abstract contract ERC31337 is WrappedERC20, IERC31337BNB
{
using SafeERC20 for IERC20;
IFloorCalculator public override floorCalculator;
mapping (address => bool) public override sweepers;
constructor(IERC20 _wrappedToken, string memory _name, string memory _symbol)
WrappedERC20(_wrappedToken, _name, _symbol)
{}
function setFloorCalculator(IFloorCalculator _floorCalculator) public override ownerOnly()
{
floorCalculator = _floorCalculator;
}
function setSweeper(address sweeper, bool allow) public override ownerOnly()
{
sweepers[sweeper] = allow;
}
function sweepFloor(address to) public override returns (uint256 amountSwept)
{
require (to != address(0));
require (sweepers[msg.sender], "Sweepers only");
amountSwept = floorCalculator.calculateSubFloorPETH(wrappedToken, this);
if (amountSwept > 0) {
wrappedToken.safeTransfer(to, amountSwept);
}
}
}
contract pETH is ERC31337, IWETH
{
using SafeMath for uint256;
uint256 public FEE=0; // use denomination = 1000 => 1%
address public FEE_ADDRESS;
mapping(address=>bool) IGNORED_ADDRESSES;
event FeeSet(address feeAddress, uint256 fee);
constructor (address wethAddress)
ERC31337(IWETH(wethAddress), "pETH", "pETH")
{
FEE_ADDRESS = 0x16352774BF9287E0324E362897c1380ABC8B2b35;
}
receive() external payable
{
if (msg.sender != address(wrappedToken)) {
deposit();
}
}
function setFee(address feeAddress, uint256 _fee) external ownerOnly{
FEE_ADDRESS = feeAddress;
FEE=_fee;
emit FeeSet(FEE_ADDRESS,FEE);
}
function setIgnoredAddresses(address _ignoredAddress, bool ignore)external ownerOnly{
IGNORED_ADDRESSES[_ignoredAddress]=ignore;
}
function setIgnoredAddressBulk(address[] memory _ignoredAddressBulk, bool ignore)external ownerOnly{
for(uint i=0;i<_ignoredAddressBulk.length;i++){
address _ignoredAddress = _ignoredAddressBulk[i];
IGNORED_ADDRESSES[_ignoredAddress] = ignore;
}
}
function isIgnored(address _ignoredAddress) public view returns (bool) {
return IGNORED_ADDRESSES[_ignoredAddress];
}
// 100 axbnb => 100 bnb is deposited to wbnb contract by this AXBNB contract => 100 AXBNB
function deposit() public payable override
{
uint256 amount = msg.value;
if(IGNORED_ADDRESSES[msg.sender]){
IWETH(address(wrappedToken)).deposit{ value: amount }();
_mint(msg.sender, amount);
emit Deposit(msg.sender, amount);
}
else{
uint256 feeAmount = amount.mul(FEE).div(100000);
IWETH(address(wrappedToken)).deposit{ value: amount }();
uint256 amountAfterFee = amount.sub(feeAmount);
_mint(msg.sender, amountAfterFee);
emit Deposit(msg.sender, amountAfterFee);
if(feeAmount>0){
_mint(FEE_ADDRESS, feeAmount);
emit Deposit(FEE_ADDRESS, feeAmount);
}
}
}
function withdraw(uint256 _amount) public override
{
if(IGNORED_ADDRESSES[msg.sender]){
_burn(msg.sender, _amount);
IWETH(address(wrappedToken)).withdraw(_amount);
msg.sender.transfer(_amount);
emit Withdrawal(msg.sender, _amount);
}
else{
uint256 feeAmount = _amount.mul(FEE).div(100000);
if(feeAmount>0){
_balanceOf[FEE_ADDRESS] = _balanceOf[FEE_ADDRESS].add(feeAmount);
_balanceOf[msg.sender] = _balanceOf[msg.sender].sub(feeAmount);
emit Transfer(msg.sender, FEE_ADDRESS, feeAmount);
}
uint256 amountAfterFee = _amount.sub(feeAmount);
_burn(msg.sender, amountAfterFee);
IWETH(address(wrappedToken)).withdraw(amountAfterFee);
(bool success,) = msg.sender.call{ value: amountAfterFee }("");
require (success, "Transfer failed");
emit Withdrawal(msg.sender, amountAfterFee);
}
}
function _transfer(address sender, address recipient, uint256 amount) internal override virtual {
require(sender != address(0), "pETH: transfer from the zero address");
require(recipient != address(0), "pETH: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
// cut no FEE
if(IGNORED_ADDRESSES[recipient]){
_balanceOf[sender] = _balanceOf[sender].sub(amount, "pETH: transfer amount exceeds balance");
_balanceOf[recipient] = _balanceOf[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
else{
// apply fee if there
_balanceOf[sender] = _balanceOf[sender].sub(amount, "pETH: transfer amount exceeds balance");
uint256 pETHFee = amount.mul(FEE).div(100000);
uint256 remAmount = amount.sub(pETHFee);
if(pETHFee>0){
_balanceOf[FEE_ADDRESS] = _balanceOf[FEE_ADDRESS].add(pETHFee);
emit Transfer(sender, FEE_ADDRESS, pETHFee);
}
_balanceOf[recipient] = _balanceOf[recipient].add(remAmount);
emit Transfer(sender, recipient, remAmount);
}
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
Wraps any ERC20
Similar to WETH except for ERC20 tokens instead of ETH
depositTokens/withdrawTokens are like deposit/withdraw in WETH
Inheriters can hook into depositTokens and withdrawTokens
by overriding _beforeDepositTokens and _beforeWithdrawTokens
*/
import "../interfaces/IERC20.sol";
import "./ERC20.sol";
import "../interfaces/IWrappedERC20.sol";
import "./TokensRecoverable.sol";
import "../libraries/SafeERC20.sol";
import "../libraries/SafeMath.sol";
contract WrappedERC20 is ERC20, IWrappedERC20, TokensRecoverable
{
using SafeERC20 for IERC20;
using SafeMath for uint256;
IERC20 public immutable override wrappedToken;
constructor (IERC20 _wrappedToken, string memory _name, string memory _symbol)
ERC20(_name, _symbol)
{
if (_wrappedToken.decimals() != 18) {
_setupDecimals(_wrappedToken.decimals());
}
wrappedToken = _wrappedToken;
}
function depositTokens(uint256 _amount) public override
{
_beforeDepositTokens(_amount);
uint256 myBalance = wrappedToken.balanceOf(address(this));
wrappedToken.safeTransferFrom(msg.sender, address(this), _amount);
uint256 received = wrappedToken.balanceOf(address(this)).sub(myBalance);
_mint(msg.sender, received);
emit Deposit(msg.sender, _amount);
}
function withdrawTokens(uint256 _amount) public override
{
_beforeWithdrawTokens(_amount);
_burn(msg.sender, _amount);
uint256 myBalance = wrappedToken.balanceOf(address(this));
wrappedToken.safeTransfer(msg.sender, _amount);
require (wrappedToken.balanceOf(address(this)) == myBalance.sub(_amount), "Transfer not exact");
emit Withdrawal(msg.sender, _amount);
}
function canRecoverTokens(IERC20 token) internal virtual override view returns (bool)
{
return token != this && token != wrappedToken;
}
function _beforeDepositTokens(uint256 _amount) internal virtual view { }
function _beforeWithdrawTokens(uint256 _amount) internal virtual view { }
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
import "./IERC20.sol";
import "./IWrappedERC20Events.sol";
interface IWETH is IERC20, IWrappedERC20Events
{
function deposit() external payable;
function withdraw(uint256 _amount) external;
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
O wherefore art thou 8 point O
*/
library SafeMath
{
function add(uint256 a, uint256 b) internal pure returns (uint256)
{
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256)
{
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256)
{
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function mul(uint256 a, uint256 b) internal pure returns (uint256)
{
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0)
{
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256)
{
return div(a, b, "SafeMath: division by zero");
}
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256)
{
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256)
{
return mod(a, b, "SafeMath: modulo by zero");
}
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256)
{
require(b != 0, errorMessage);
return a % b;
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
import "./IERC20.sol";
interface IFloorCalculator
{
function calculateSubFloorPETH(IERC20 wrappedToken, IERC20 backingToken) external view returns (uint256);
function calculateSubFloorCircleNFT(IERC20[] memory wrappedTokens, IERC20 backingToken) external view returns ( uint256);
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
interface IERC20
{
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
function totalSupply() external view returns (uint256);
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);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
Simplified thanks to higher solidity version
But same functionality
*/
import "../interfaces/IERC20.sol";
import "../libraries/SafeMath.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
abstract contract ERC20 is IERC20
{
using SafeMath for uint256;
mapping (address => uint256) internal _balanceOf;
mapping (address => mapping (address => uint256)) public override allowance;
uint256 public override totalSupply;
string public override name;
string public override symbol;
uint8 public override decimals = 18;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory _name, string memory _symbol)
{
name = _name;
symbol = _symbol;
}
function balanceOf(address a) public virtual override view returns (uint256) { return _balanceOf[a]; }
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 oldAllowance = allowance[sender][msg.sender];
if (oldAllowance != uint256(-1)) {
_approve(sender, msg.sender, oldAllowance.sub(amount, "ERC20: transfer amount exceeds allowance"));
}
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(msg.sender, spender, allowance[msg.sender][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(msg.sender, spender, allowance[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balanceOf[sender] = _balanceOf[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balanceOf[recipient] = _balanceOf[recipient].add(amount);
emit Transfer(sender, recipient, 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 virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
totalSupply = totalSupply.add(amount);
_balanceOf[account] = _balanceOf[account].add(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 virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balanceOf[account] = _balanceOf[account].sub(amount, "ERC20: burn amount exceeds balance");
totalSupply = totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
allowance[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 _decimals) internal {
decimals = _decimals;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
import "./IERC20.sol";
import "./IWrappedERC20Events.sol";
interface IWrappedERC20 is IERC20, IWrappedERC20Events
{
function wrappedToken() external view returns (IERC20);
function depositTokens(uint256 _amount) external;
function withdrawTokens(uint256 _amount) external;
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
Allows recovery of unexpected tokens (airdrops, etc)
Inheriters can customize logic by overriding canRecoverTokens
*/
import "../interfaces/IERC20.sol";
import "../libraries/SafeERC20.sol";
import "./Owned.sol";
import "../interfaces/ITokensRecoverable.sol";
abstract contract TokensRecoverable is Owned, ITokensRecoverable
{
using SafeERC20 for IERC20;
function recoverTokens(IERC20 token) public override ownerOnly()
{
require (canRecoverTokens(token));
token.safeTransfer(msg.sender, token.balanceOf(address(this)));
}
function recoverETH(uint256 amount) public override ownerOnly()
{
msg.sender.transfer(amount);
}
function canRecoverTokens(IERC20 token) internal virtual view returns (bool)
{
return address(token) != address(this);
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
Modified to remove some junk
Also modified to remove silly restrictions (traps!) within safeApprove
*/
import "../interfaces/IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance =
token.allowance(address(this), spender).add(value);
_callOptionalReturn(
token,
abi.encodeWithSelector(
token.approve.selector,
spender,
newAllowance
)
);
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance =
token.allowance(address(this), spender).sub(
value,
"SafeERC20: decreased allowance below zero"
);
_callOptionalReturn(
token,
abi.encodeWithSelector(
token.approve.selector,
spender,
newAllowance
)
);
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "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");
}
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
interface IWrappedERC20Events
{
event Deposit(address indexed from, uint256 amount);
event Withdrawal(address indexed to, uint256 amount);
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/* ROOTKIT:
Provides ownerOnly() modifier
Allows for ownership transfer but requires the new
owner to claim (accept) ownership
Safer because no accidental transfers or renouncing
*/
import "../interfaces/IOwned.sol";
abstract contract Owned is IOwned
{
address public override owner = msg.sender;
address internal pendingOwner;
modifier ownerOnly()
{
require (msg.sender == owner, "Owner only");
_;
}
function transferOwnership(address newOwner) public override ownerOnly()
{
pendingOwner = newOwner;
}
function claimOwnership() public override
{
require (pendingOwner == msg.sender);
pendingOwner = address(0);
emit OwnershipTransferred(owner, msg.sender);
owner = msg.sender;
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
import "./IERC20.sol";
interface ITokensRecoverable
{
function recoverTokens(IERC20 token) external;
function recoverETH(uint256 amount) external;
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;
interface IOwned
{
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
function owner() external view returns (address);
function transferOwnership(address newOwner) external;
function claimOwnership() external;
}