Contract Name:
ERC20WarpToken
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead 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}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, 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}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
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) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + 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) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This 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:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(address from, address to, uint256 amount) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, 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:
*
* - `account` 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 += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(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);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(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");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @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 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 {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)
pragma solidity ^0.8.0;
import "../ERC20.sol";
import "../../../utils/Context.sol";
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
abstract contract ERC20Burnable is Context, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function burnFrom(address account, uint256 amount) public virtual {
_spendAllowance(account, _msgSender(), amount);
_burn(account, amount);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*
* ==== Security Considerations
*
* There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
* expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
* considered as an intention to spend the allowance in any specific way. The second is that because permits have
* built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
* take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
* generally recommended is:
*
* ```solidity
* function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
* try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
* doThing(..., value);
* }
*
* function doThing(..., uint256 value) public {
* token.safeTransferFrom(msg.sender, address(this), value);
* ...
* }
* ```
*
* Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
* `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
* {SafeERC20-safeTransferFrom}).
*
* Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
* contracts should have entry points that don't rely on permit.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*
* CAUTION: See Security Considerations above.
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/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 Address for address;
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
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 {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
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));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @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");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
/**
* @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).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// 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 cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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");
(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 functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
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 v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}
// SPDX-License-Identifier: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]
pragma solidity ^0.8.9;
interface IERC20cl {
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);
}
// SPDX-License-Identifier: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]
pragma solidity ^0.8.9;
interface IMessageV3 {
event SendRequested(uint txId, address sender, address recipient, uint chain, bool express, bytes data, uint16 confirmations);
event SendProcessed(uint txId, uint sourceChainId, address sender, address recipient);
event Success(uint txId, uint sourceChainId, address sender, address recipient, uint amount);
event ErrorLog(uint txId, string message);
event SetExsig(address caller, address signer);
event SetMaxgas(address caller, uint maxGas);
event SetMaxfee(address caller, uint maxFee);
function chainsig() external view returns (address signer);
function weth() external view returns (address wethTokenAddress);
function feeToken() external view returns (address feeToken);
function feeTokenDecimals() external view returns (uint feeTokenDecimals);
function minFee() external view returns (uint minFee);
function bridgeEnabled() external view returns (bool bridgeEnabled);
function takeFeesOffline() external view returns (bool takeFeesOffline);
function whitelistOnly() external view returns (bool whitelistOnly);
function enabledChains(uint destChainId) external view returns (bool enabled);
function customSourceFee(address caller) external view returns (uint customSourceFee);
function maxgas(address caller) external view returns (uint maxgas);
function exsig(address caller) external view returns (address signer);
// @dev backwards compat with BridgeClient
function minTokenForChain(uint chainId) external returns (uint amount);
function sendMessage(address recipient, uint chain, bytes calldata data, uint16 confirmations, bool express) external returns (uint txId);
// @dev backwards compat with BridgeClient
function sendRequest(address recipient, uint chainId, uint amount, address referrer, bytes calldata data, uint16 confirmations) external returns (uint txId);
function setExsig(address signer) external;
function setMaxgas(uint maxgas) external;
function setMaxfee(uint maxfee) external;
function getSourceFee(uint _destChainId, bool _express) external view returns (uint _fee);
}
// SPDX-License-Identifier: MIT
// (c)2021-2024 Atlas
// security-contact: [email protected]
pragma solidity ^0.8.9;
import "./IMessageV3.sol";
import "./IERC20cl.sol";
interface IFeature {
function getPayload(uint _txId) external view returns (bytes memory);
}
interface IFeatureGateway {
function isFeatureEnabled(uint32) external view returns (bool);
function featureAddresses(uint32) external view returns (address);
function messageV3() external view returns (IMessageV3);
function processForward(uint _txId, uint _sourceChainId, uint _destChainId, address _sender, address _recipient, uint _gas, bytes[] calldata _data) external;
function process(uint txId, uint sourceChainId, uint destChainId, address sender, address recipient, uint gas, uint32 featureId, bytes calldata featureReply, bytes[] calldata data) external;
}
/**
* @title MessageV3 Client
* @author Atlas <[email protected]>
*/
abstract contract MessageClient {
IMessageV3 public MESSAGEv3;
IERC20cl public FEE_TOKEN;
IFeatureGateway public FEATURE_GATEWAY;
mapping(uint => mapping(uint32 => ChainData)) public FEATURES;
struct ChainData {
address endpoint; // address of this contract on specified chain
bytes endpointExtended; // address of this contract on non EVM
uint16 confirmations; // source confirmations
bool extended; // are we using extended endpoint? (addresses larger than uint256)
}
mapping(uint => ChainData) public CHAINS;
address public MESSAGE_OWNER;
modifier onlySelf(address _sender, uint _sourceChainId) {
require(msg.sender == address(MESSAGEv3), "MessageClient: not authorized");
require(_sender == CHAINS[_sourceChainId].endpoint, "MessageClient: not authorized");
_;
}
modifier onlyActiveChain(uint _destinationChainId) {
require(CHAINS[_destinationChainId].endpoint != address(0), "MessageClient: destination chain not active");
_;
}
modifier onlyMessageOwner() {
require(msg.sender == MESSAGE_OWNER, "MessageClient: not authorized");
_;
}
event MessageOwnershipTransferred(address previousOwner, address newOwner);
event RecoverToken(address owner, address token, uint amount);
event SetMaxgas(address owner, uint maxGas);
event SetMaxfee(address owner, uint maxfee);
event SetExsig(address owner, address exsig);
event SendMessageWithFeature(uint txId, uint destinationChainId, uint32 featureId, bytes featureData);
constructor() {
MESSAGE_OWNER = msg.sender;
}
function transferMessageOwnership(address _newMessageOwner) external onlyMessageOwner {
MESSAGE_OWNER = _newMessageOwner;
emit MessageOwnershipTransferred(msg.sender, _newMessageOwner);
}
/** BRIDGE RECEIVER */
// @dev DEPRICATED kept for backwards compatibility
function messageProcess(
uint _txId, // transaction id
uint _sourceChainId, // source chain id
address _sender, // corresponding MessageClient address on source chain
address,
uint,
bytes calldata _data // encoded message from source chain
) external virtual onlySelf (_sender, _sourceChainId) {
_processMessage(_txId, _sourceChainId, _data);
}
// @dev PREFERRED if no Features used
// this is extended by the implementing class if not using Features
function _processMessage(uint _txId, uint _sourceChainId, bytes calldata _data) internal virtual {
(uint32 _featureId, bytes memory _featureData, bytes memory _messageData) = abi.decode(_data, (uint32, bytes, bytes));
// call the implementing class to process the message
_processMessageWithFeature(_txId, _sourceChainId, _messageData, _featureId, _featureData, _getFeatureResponse(_featureId, _txId));
}
// @dev REQUIRED if using Features
// this is extended by the implementing class if using Features
function _processMessageWithFeature(
uint, // transaction id
uint, // source chain id
bytes memory, // encoded message from source chain
uint32, // feature id
bytes memory, // encoded feature data
bytes memory // reply from feature processing off-chain
) internal virtual {
revert("MessageClient: _processMessage or _processMessageWithFeature not implemented");
}
function _getFeatureResponse(uint32 _featureId, uint _txId) internal view returns (bytes memory) {
return IFeature(FEATURE_GATEWAY.featureAddresses(_featureId)).getPayload(_txId);
}
/** BRIDGE SENDER */
function _sendMessage(uint _destinationChainId, bytes memory _data) internal returns (uint _txId) {
ChainData memory _chain = CHAINS[_destinationChainId];
if(_chain.extended) { // non-evm addresses larger than uint256
_data = abi.encode(_data, _chain.endpointExtended);
}
return IMessageV3(MESSAGEv3).sendMessage(
_chain.endpoint, // corresponding MessageClient contract address on destination chain
_destinationChainId, // id of the destination chain
_data, // arbitrary data package to send
_chain.confirmations, // amount of required transaction confirmations
false // send express mode on destination
);
}
function _sendMessageExpress(uint _destinationChainId, bytes memory _data) internal returns (uint _txId) {
ChainData memory _chain = CHAINS[_destinationChainId];
if(_chain.extended) { // non-evm addresses larger than uint256
_data = abi.encode(_data, _chain.endpointExtended);
}
return IMessageV3(MESSAGEv3).sendMessage(
_chain.endpoint, // corresponding MessageV3Client contract address on destination chain
_destinationChainId, // id of the destination chain
_data, // arbitrary data package to send
_chain.confirmations, // amount of required transaction confirmations
true // send express mode on destination
);
}
function _sendMessageWithFeature(uint _destinationChainId, bytes memory _messageData, uint32 _featureId, bytes memory _featureData) internal returns (uint _txId) {
require(FEATURE_GATEWAY.isFeatureEnabled(_featureId), "MessageClient: feature not enabled");
// wrap feature data into message data so it can be signed
bytes memory _data = abi.encode(_featureId, _featureData, _messageData);
ChainData memory _chain = CHAINS[_destinationChainId];
if(_chain.extended) { // non-evm addresses larger than uint256
_data = abi.encode(_data, _chain.endpointExtended);
}
_txId = IMessageV3(MESSAGEv3).sendMessage(
_chain.endpoint, // corresponding MessageV3Client contract address on destination chain
_destinationChainId, // id of the destination chain
_data, // arbitrary data package to send
_chain.confirmations, // amount of required transaction confirmations
false // send express mode on destination
);
// signal we have feature data included with the message data
emit SendMessageWithFeature(_txId, _destinationChainId, _featureId, _featureData);
}
/** OWNER */
function configureClientExtended(
address _messageV3, // MessageV3 bridge address
uint[] calldata _chains, // list of chains to accept as valid destinations
bytes[] calldata _endpoints, // list of corresponding MessageV3Client addresses on each chain
uint16[] calldata _confirmations // confirmations required on each chain before processing
) external onlyMessageOwner {
uint _chainsLength = _chains.length;
for(uint x=0; x < _chainsLength; x++) {
CHAINS[_chains[x]].confirmations = _confirmations[x];
CHAINS[_chains[x]].endpointExtended = _endpoints[x];
CHAINS[_chains[x]].extended = true;
CHAINS[_chains[x]].endpoint = address(1);
}
_configureMessageV3(_messageV3);
}
function configureClient(
address _messageV3, // MessageV3 bridge address
uint[] calldata _chains, // list of chains to accept as valid destinations
address[] calldata _endpoints, // list of corresponding MessageV3Client addresses on each chain
uint16[] calldata _confirmations // confirmations required on each chain before processing
) public onlyMessageOwner {
uint _chainsLength = _chains.length;
for(uint x=0; x < _chainsLength; x++) {
CHAINS[_chains[x]].confirmations = _confirmations[x];
CHAINS[_chains[x]].endpoint = _endpoints[x];
CHAINS[_chains[x]].extended = false;
}
_configureMessageV3(_messageV3);
}
function configureFeatureGateway(address _featureGateway) external onlyMessageOwner {
FEATURE_GATEWAY = IFeatureGateway(_featureGateway);
}
function _configureMessageV3(address _messageV3) internal {
MESSAGEv3 = IMessageV3(_messageV3);
FEE_TOKEN = IERC20cl(MESSAGEv3.feeToken());
// approve bridge for source chain fees (limited per transaction with setMaxfee)
if(address(FEE_TOKEN) != address(0)) {
FEE_TOKEN.approve(address(MESSAGEv3), type(uint).max);
}
// approve bridge for destination gas fees (limited per transaction with setMaxgas)
if(address(MESSAGEv3.weth()) != address(0)) {
IERC20cl(MESSAGEv3.weth()).approve(address(MESSAGEv3), type(uint).max);
}
}
function setExsig(address _signer) public onlyMessageOwner {
MESSAGEv3.setExsig(_signer);
emit SetExsig(msg.sender, _signer);
}
function setMaxgas(uint _maxGas) public onlyMessageOwner {
MESSAGEv3.setMaxgas(_maxGas);
emit SetMaxgas(msg.sender, _maxGas);
}
function setMaxfee(uint _maxFee) public onlyMessageOwner {
MESSAGEv3.setMaxfee(_maxFee);
emit SetMaxfee(msg.sender, _maxFee);
}
function recoverToken(address _token, uint _amount) public onlyMessageOwner {
if(_token == address(0)) {
// payable(msg.sender).transfer(_amount);
// @note Zk needs
(bool success, ) = payable(msg.sender).call{value: _amount}("");
require(success, "Transfer failed");
} else {
IERC20cl(_token).transfer(msg.sender, _amount);
}
emit RecoverToken(msg.sender, _token, _amount);
}
function isSelf(address _sender, uint _sourceChainId) public view returns (bool) {
if(_sender == CHAINS[_sourceChainId].endpoint) return true;
return false;
}
function isAuthorized(address _sender, uint _sourceChainId) public view returns (bool) {
return isSelf(_sender, _sourceChainId);
}
receive() external payable {}
fallback() external payable {}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;
import "@vialabs/contracts/message/MessageClient.sol";
import "@openzeppelin/contracts-4/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts-4/token/ERC20/utils/SafeERC20.sol";
interface IBurnableToken {
function burn(uint256 amount) external;
function totalSupply() external;
function balanceOf(address account) external;
function transfer(address recipient, uint256 amount) external;
function allowance(address owner, address spender) external;
function approve(address spender, uint256 amount) external;
function transferFrom(address sender, address recipient, uint256 amount) external;
}
contract ERC20WarpToken is ERC20Burnable, MessageClient {
IBurnableToken public immutable baseToken;
uint256 public immutable homeChain;
uint256 public immutable chainId;
uint8 public immutable tokenDecimals;
uint256 private _fee = 1 ether;
bool private _canGoBack = false;
address private _feeBeneficiary;
event TokensReceived(address _eTo, uint256 _eAmount);
event FeeChanged(uint256 _amount);
event BeneficiaryChanged(address _beneficiary);
event StatusChanged(bool _status);
/**
* On the "homeChain" the baseToken will be transferred to this contract and the equivalent amount of tokens will be minted on
* the destination chain. On the destination chain the "new" ERC20 will be minted and transferred to the recipient. When bridging
* back from a new chain to the home chain, the tokens will be burned on the destination chain and the equivalent amount will be
* unlocked on the home chain from this contract. This acts as a "locker" for the tokens on the home chain.
*
* On each new non-home chain, the tokens will be burned on the source chain and minted on the destination chain (like helloerc20)
*
* @param _homeChain chain ID of the original ERC20 token
* @param _baseToken address of the original ERC20 token (blank if not on the home chain)
* @param _tokenName name of the ERC20 token on each additional chain (blank if on the home chain)
* @param _tokenSymbol symbol of the ERC20 token on each additional chain (blank if on the home chain)
* @param _tokenDecimals decimals of the ERC20 token on each additional chain
*/
constructor(
uint256 _homeChain,
address _baseToken,
string memory _tokenName,
string memory _tokenSymbol,
uint8 _tokenDecimals
) ERC20(_tokenName, _tokenSymbol) {
baseToken = IBurnableToken(_baseToken);
homeChain = _homeChain;
chainId = block.chainid;
tokenDecimals = _tokenDecimals;
// @note Some sane initial value. But allow to change.
_feeBeneficiary = MESSAGE_OWNER;
}
/**
* Function to collect the accumulated fees in a much cheaper way compared to moving them on every tx. onlyMessageOwner can be omitted.
*
*/
function collect() external onlyMessageOwner {
(bool sent, ) = payable(_feeBeneficiary).call{
value: address(this).balance
}("");
require(sent, "Failed to send Ether");
}
/**
* Function to set the fee
*
* @param _amount amount of desired fee
*/
function setFee(uint256 _amount) external onlyMessageOwner {
_fee = _amount;
emit FeeChanged(_fee);
}
/**
* Function to set the fee
*
* @param _beneficiary address that will receive the fees collected over time
*/
function setBeneficiary(address _beneficiary) external onlyMessageOwner {
_feeBeneficiary = _beneficiary;
emit BeneficiaryChanged(_feeBeneficiary);
}
/**
* Function to set if going back is allowed (for future use, as there will be no tokens locked, everything is burned)
*
* @param _status whether to allow going back or not
*/
function setStatus(bool _status) external onlyMessageOwner {
_canGoBack = _status;
emit StatusChanged(_canGoBack);
}
/**
* Bridge tokens from the current chain to the destination chain. If the current chain is the home chain, the tokens will be
* transferred to this contract locked. If the current chain is not the home chain, the tokens will be burned on the current chain.
* Function is "payable"
*
* After locking or burning, a cross chain message will be sent to the destination chain with the recipient and amount of tokens.
*
* @param _destChainId chain ID of the destination chain
* @param _recipient address of the recipient on the destination chain
* @param _amount amount of tokens to bridge
*/
function bridge(
uint256 _destChainId,
address _recipient,
uint256 _amount
) external payable onlyActiveChain(_destChainId) {
require(msg.value == _fee, "Sent fee amount is incorrect");
// @note needs this as onlyActiveChain() will have a valid chain because we need to receive messages from those chains in onlySelf(_sender, _sourceChainId)
if (_destChainId == homeChain) {
require(_canGoBack == true, "Going back is not allowed");
}
if (chainId == homeChain) {
baseToken.transferFrom(msg.sender, address(this), _amount);
// burn tokens if home chain
baseToken.burn(_amount);
} else {
// burn tokens if "new" chain
_burn(msg.sender, _amount);
}
// send cross chain message
_sendMessage(_destChainId, abi.encode(_recipient, _amount));
}
function decimals() public view override returns (uint8) {
return tokenDecimals;
}
/**
* If the destination chain is the home chain, the tokens will be unlocked and transferred to the recipient. If the destination
* chain is not the home chain, the tokens will be minted on the destination chain and transferred to the recipient.
*/
function messageProcess(
uint256,
uint256 _sourceChainId,
address _sender,
address,
uint256,
bytes calldata _data
) external override onlySelf(_sender, _sourceChainId) {
(address _recipient, uint256 _amount) = abi.decode(
_data,
(address, uint256)
);
if (chainId == homeChain) {
// this won't trigger, do nothing
} else {
// mint tokens of "new" chain
_mint(_recipient, _amount);
}
emit TokensReceived(_recipient, _amount);
}
/**
* Function to read the fee
*
*/
function getFee() external view returns (uint256) {
return _fee;
}
/**
* Function to read the beneficiary
*
*/
function getBeneficiary() external view returns (address) {
return _feeBeneficiary;
}
/**
* Function to read the status
*
*/
function getStatus() external view returns (bool) {
return _canGoBack;
}
}