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This contract may be a proxy contract. Click on More Options and select Is this a proxy? to confirm and enable the "Read as Proxy" & "Write as Proxy" tabs.
Contract Name:
InfinexFaucet
Compiler Version
v0.8.21+commit.d9974bed
Optimization Enabled:
Yes with 200 runs
Other Settings:
shanghai EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// c=<
// |
// | ////\ 1@2
// @@ | /___\** @@@2 @@@@@@@@@@@@@@@@@@@@@@
// @@@ | |~L~ |* @@@@@@ @@@ @@@@@ @@@@ @@@ @@@@ @@@ @@@@@@@@ @@@@ @@@@ @@@ @@@@@@@@@ @@@@ @@@@
// @@@@@ | \=_/8 @@@@1@@ @@@ @@@@@ @@@@ @@@@ @@@ @@@@@ @@@ @@@@@@@@@ @@@@ @@@@@ @@@@ @@@@@@@@@ @@@@ @@@@
// @@@@@@| _ /| |\__ @@@@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@ @@@ @@@@ @@@@ @@@@@@ @@@@ @@@ @@@@@@@
// 1@@@@@@|\ \___/) @@1@@@@@2 ~~~ ~~~~~ @@@@ ~~@@ ~~~ ~~~~~~~~~~~ ~~~~ ~~~~ ~~~~~~~~~~~ ~@@ @@@@@
// 2@@@@@ | \ \ / | @@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@@@@@ @@@@@@@@@ @@@@ @@@@@@@@@@@ @@@@@@@@@ @@@@@
// 2@@@@ |_ > <|__ @@1@12 @@@ @@@@@ @@@@ @@@@ @@@ @@@@ @@@@@@ @@@@ @@@@ @@@@ @@@@@@ @@@ @@@@@@@
// @@@@ / _| / \/ \ @@1@ @@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@ @@@@ @@@@ @@@@ @@@@@ @@@@@@@@@ @@@@ @@@@
// @@ / |^\/ | | @@1 @@@ @@@@ @@@@ @@@ @@@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@@@@@ @@@@ @@@@
// / / ---- \ \\\= @@ @@@@@@@@@@@@@@@@@@@@@@
// \___/ -------- ~~ @@@
// @@ | | | | -- @@
// ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { IInfinexFaucet } from "src/infinex-faucet/IInfinexFaucet.sol";
import { EIP712 } from "src/accounts/storage/EIP712.sol";
import { Ownable } from "src/ownership/Ownable.sol";
import { UUPSImplementation } from "src/proxy/UUPSImplementation.sol";
import { InfinexFaucetStorage } from "src/infinex-faucet/InfinexFaucetStorage.sol";
contract InfinexFaucet is IInfinexFaucet, Ownable, UUPSImplementation, Initializable {
using SafeERC20 for IERC20;
using ECDSA for bytes32;
bytes32 internal constant _CLAIM_REQUEST_TYPEHASH = keccak256(
"ClaimRequest(address recipientAddress,uint256 claimAmount,address tokenAddress,uint256 tokenAmount,uint256 nonce,uint256 timestamp)"
);
/*///////////////////////////////////////////////////////////////
CONSTRUCTOR
///////////////////////////////////////////////////////////////*/
constructor() Ownable(address(this)) {
_disableInitializers();
}
/*///////////////////////////////////////////////////////////////
INITIALIZER
///////////////////////////////////////////////////////////////*/
/**
* @notice Initializes the contract.
* @param _claimSigner The address of the claim signer.
* @param _maxEthPerClaim The maximum amount of ETH that can be claimed per claim.
* @param _signatureExpiryTime The expiry time for the claim signature.
* @param _feeCollector The address of the fee collector.
*/
function initialize(address _claimSigner, uint256 _maxEthPerClaim, uint256 _signatureExpiryTime, address _feeCollector)
external
initializer
{
if (_claimSigner == address(0)) revert ZeroAddress();
if (_maxEthPerClaim == 0) revert ZeroAmount();
if (_signatureExpiryTime == 0) revert ZeroExpiry();
if (_feeCollector == address(0)) revert ZeroAddress();
EIP712.__EIP712_init("InfinexFaucet", "1");
InfinexFaucetStorage._setClaimSigner(_claimSigner);
InfinexFaucetStorage._setMaxEthPerClaim(_maxEthPerClaim);
InfinexFaucetStorage._setSignatureExpiryTime(_signatureExpiryTime);
InfinexFaucetStorage._setFeeCollector(_feeCollector);
}
/**
* @notice Returns the address that signs the claim requests.
* @return The address of the claim signer.
*/
function getClaimSigner() external view returns (address) {
return InfinexFaucetStorage._getClaimSigner();
}
/**
* @notice Returns the maximum amount of ETH that can be claimed per claim.
* @return The maximum amount of ETH that can be claimed per claim.
*/
function getMaxEthPerClaim() external view returns (uint256) {
return InfinexFaucetStorage._getMaxEthPerClaim();
}
/**
* @notice Returns the address that collects the fees.
* @return The address of the fee collector.
*/
function getFeeCollector() external view returns (address) {
return InfinexFaucetStorage._getFeeCollector();
}
/**
* @notice Checks if a nonce has been claimed.
* @param _nonce The nonce to check.
* @return Whether the nonce has been claimed.
*/
function isClaimedNonce(uint256 _nonce) external view returns (bool) {
return InfinexFaucetStorage._isClaimedNonce(_nonce);
}
/**
* @notice Returns the expiry time for the claim signature
* @return The expiry time for the claim signature
*/
function getSignatureExpiryTime() external view returns (uint256) {
return InfinexFaucetStorage._getSignatureExpiryTime();
}
/**
* @notice Claims ETH from the faucet.
* @param _request The claim request.
* @param _claimSignature The claim signature.
* @dev the tokenAddress is optional, if it's zero, the claim is for ETH with no token fee sent to the feeCollector.
*/
function claimEth(ClaimRequest calldata _request, bytes calldata _claimSignature) external {
if (_request.claimAmount == 0 || _request.claimAmount > InfinexFaucetStorage._getMaxEthPerClaim()) revert InvalidClaimAmount();
if (InfinexFaucetStorage._isClaimedNonce(_request.nonce)) revert InvalidNonce();
if (address(this).balance < _request.claimAmount) revert InvalidBalance();
if (_request.timestamp > block.timestamp) revert InvalidTimestamp();
if (block.timestamp > _request.timestamp + InfinexFaucetStorage._getSignatureExpiryTime()) revert RequestExpired();
if (recoverClaimSigner(_request, _claimSignature) != InfinexFaucetStorage._getClaimSigner()) revert InvalidSignature();
emit ClaimSuccessful(
_request.recipientAddress,
_request.claimAmount,
_request.tokenAddress,
_request.tokenAmount,
_request.nonce,
_request.timestamp
);
InfinexFaucetStorage._consumeNonce(_request.nonce);
if (_request.tokenAddress != address(0)) {
if (_request.tokenAmount != IERC20(_request.tokenAddress).allowance(_request.recipientAddress, address(this))) {
revert InvalidTokenAllowance();
}
// slither-disable-next-line arbitrary-send-erc20
IERC20(_request.tokenAddress).safeTransferFrom(
_request.recipientAddress, InfinexFaucetStorage._getFeeCollector(), _request.tokenAmount
);
}
// slither-disable-next-line arbitrary-send-eth
(bool success,) = _request.recipientAddress.call{ value: _request.claimAmount }("");
if (!success) revert EtherTransferFailed();
}
/**
* @notice Sets the claim signer.
* @param _newClaimSigner The new claim signer.
* @dev Only the owner can set the claim signer.
*/
function setClaimSigner(address _newClaimSigner) external onlyOwner {
if (_newClaimSigner == address(0)) revert ZeroAddress();
emit ClaimSignerSet(_newClaimSigner);
InfinexFaucetStorage._setClaimSigner(_newClaimSigner);
}
/**
* @notice Sets the maximum amount of ETH that can be claimed per claim.
* @param _newMaxEthPerClaim The new maximum amount of ETH that can be claimed per claim.
* @dev Only the owner can set the maximum amount of ETH that can be claimed per claim.
*/
function setMaxEthPerClaim(uint256 _newMaxEthPerClaim) external onlyOwner {
if (_newMaxEthPerClaim == 0) revert ZeroAmount();
emit MaxEthPerClaimSet(_newMaxEthPerClaim);
InfinexFaucetStorage._setMaxEthPerClaim(_newMaxEthPerClaim);
}
/**
* @notice Sets the address that collects the fees.
* @param _newFeeCollector The new fee collector.
* @dev Only the owner can set the fee collector.
*/
function setFeeCollector(address _newFeeCollector) external onlyOwner {
if (_newFeeCollector == address(0)) revert ZeroAddress();
emit FeeCollectorSet(_newFeeCollector);
InfinexFaucetStorage._setFeeCollector(_newFeeCollector);
}
/**
* @notice Sets the expiry time for the claim signature
* @param _newExpiryTime The new expiry time for the claim signature
* @dev Only the owner can set the expiry time for the claim signature.
*/
function setSignatureExpiryTime(uint256 _newExpiryTime) external onlyOwner {
if (_newExpiryTime == 0) revert ZeroExpiry();
emit SignatureExpiryTimeSet(_newExpiryTime);
InfinexFaucetStorage._setSignatureExpiryTime(_newExpiryTime);
}
/**
* @notice Recovers the claim signer from the claim request and the claim request signature.
* @param _request The claim request.
* @param _claimRequestSignature The claim request signature.
* @return The address of the claim signer.
*/
function recoverClaimSigner(ClaimRequest calldata _request, bytes calldata _claimRequestSignature) public view returns (address) {
return ECDSA.recover(
EIP712._hashTypedDataV4(
keccak256(
abi.encode(
_CLAIM_REQUEST_TYPEHASH,
_request.recipientAddress,
_request.claimAmount,
_request.tokenAddress,
_request.tokenAmount,
_request.nonce,
_request.timestamp
)
)
),
_claimRequestSignature
);
}
/**
* @notice Withdraws the specified amount of ETH to the owner.
* @param _amount The amount of ETH to withdraw.
* @dev Only the owner can withdraw the ETH.
*/
function withdrawEthToOwner(uint256 _amount) external onlyOwner {
emit WithdrawEth(_owner(), _amount);
(bool success,) = _owner().call{ value: _amount }("");
if (!success) revert EtherTransferFailed();
}
/**
* @notice Withdraws the specified amount of the specified ERC20 token to the owner.
* @param _tokenAddress The address of the ERC20 token.
* @param _amount The amount of the ERC20 token to withdraw.
* @dev Only the owner can withdraw the ERC20 token.
*/
function withdrawERC20ToOwner(address _tokenAddress, uint256 _amount) external onlyOwner {
emit WithdrawERC20(_tokenAddress, _amount);
IERC20(_tokenAddress).safeTransfer(_owner(), _amount);
}
/**
* @notice Upgrades the contract to a new implementation.
* @param _newImplementation The address of the new implementation.
* @dev Only the owner can upgrade the contract.
*/
function upgradeTo(address _newImplementation) external onlyOwner {
_upgradeTo(_newImplementation);
}
/**
* @notice Allows the contract to receive ETH.
*/
receive() external payable {
emit Deposit(msg.sender, msg.value);
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)
pragma solidity ^0.8.20;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
* reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
* case an upgrade adds a module that needs to be initialized.
*
* For example:
*
* [.hljs-theme-light.nopadding]
* ```solidity
* contract MyToken is ERC20Upgradeable {
* function initialize() initializer public {
* __ERC20_init("MyToken", "MTK");
* }
* }
*
* contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
* function initializeV2() reinitializer(2) public {
* __ERC20Permit_init("MyToken");
* }
* }
* ```
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*
* [CAUTION]
* ====
* Avoid leaving a contract uninitialized.
*
* An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
* contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
* the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
*
* [.hljs-theme-light.nopadding]
* ```
* /// @custom:oz-upgrades-unsafe-allow constructor
* constructor() {
* _disableInitializers();
* }
* ```
* ====
*/
abstract contract Initializable {
/**
* @dev Storage of the initializable contract.
*
* It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
* when using with upgradeable contracts.
*
* @custom:storage-location erc7201:openzeppelin.storage.Initializable
*/
struct InitializableStorage {
/**
* @dev Indicates that the contract has been initialized.
*/
uint64 _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool _initializing;
}
// keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;
/**
* @dev The contract is already initialized.
*/
error InvalidInitialization();
/**
* @dev The contract is not initializing.
*/
error NotInitializing();
/**
* @dev Triggered when the contract has been initialized or reinitialized.
*/
event Initialized(uint64 version);
/**
* @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
* `onlyInitializing` functions can be used to initialize parent contracts.
*
* Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
* number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
* production.
*
* Emits an {Initialized} event.
*/
modifier initializer() {
// solhint-disable-next-line var-name-mixedcase
InitializableStorage storage $ = _getInitializableStorage();
// Cache values to avoid duplicated sloads
bool isTopLevelCall = !$._initializing;
uint64 initialized = $._initialized;
// Allowed calls:
// - initialSetup: the contract is not in the initializing state and no previous version was
// initialized
// - construction: the contract is initialized at version 1 (no reininitialization) and the
// current contract is just being deployed
bool initialSetup = initialized == 0 && isTopLevelCall;
bool construction = initialized == 1 && address(this).code.length == 0;
if (!initialSetup && !construction) {
revert InvalidInitialization();
}
$._initialized = 1;
if (isTopLevelCall) {
$._initializing = true;
}
_;
if (isTopLevelCall) {
$._initializing = false;
emit Initialized(1);
}
}
/**
* @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
* contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
* used to initialize parent contracts.
*
* A reinitializer may be used after the original initialization step. This is essential to configure modules that
* are added through upgrades and that require initialization.
*
* When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
* cannot be nested. If one is invoked in the context of another, execution will revert.
*
* Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
* a contract, executing them in the right order is up to the developer or operator.
*
* WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
*
* Emits an {Initialized} event.
*/
modifier reinitializer(uint64 version) {
// solhint-disable-next-line var-name-mixedcase
InitializableStorage storage $ = _getInitializableStorage();
if ($._initializing || $._initialized >= version) {
revert InvalidInitialization();
}
$._initialized = version;
$._initializing = true;
_;
$._initializing = false;
emit Initialized(version);
}
/**
* @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
* {initializer} and {reinitializer} modifiers, directly or indirectly.
*/
modifier onlyInitializing() {
_checkInitializing();
_;
}
/**
* @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
*/
function _checkInitializing() internal view virtual {
if (!_isInitializing()) {
revert NotInitializing();
}
}
/**
* @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
* Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
* to any version. It is recommended to use this to lock implementation contracts that are designed to be called
* through proxies.
*
* Emits an {Initialized} event the first time it is successfully executed.
*/
function _disableInitializers() internal virtual {
// solhint-disable-next-line var-name-mixedcase
InitializableStorage storage $ = _getInitializableStorage();
if ($._initializing) {
revert InvalidInitialization();
}
if ($._initialized != type(uint64).max) {
$._initialized = type(uint64).max;
emit Initialized(type(uint64).max);
}
}
/**
* @dev Returns the highest version that has been initialized. See {reinitializer}.
*/
function _getInitializedVersion() internal view returns (uint64) {
return _getInitializableStorage()._initialized;
}
/**
* @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
*/
function _isInitializing() internal view returns (bool) {
return _getInitializableStorage()._initializing;
}
/**
* @dev Returns a pointer to the storage namespace.
*/
// solhint-disable-next-line var-name-mixedcase
function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
assembly {
$.slot := INITIALIZABLE_STORAGE
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @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 value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` 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 value) external returns (bool);
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)
pragma solidity ^0.8.20;
/**
* @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 v5.0.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../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 An operation with an ERC20 token failed.
*/
error SafeERC20FailedOperation(address token);
/**
* @dev Indicates a failed `decreaseAllowance` request.
*/
error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
/**
* @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, 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);
forceApprove(token, spender, oldAllowance + value);
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
* value, non-reverting calls are assumed to be successful.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
unchecked {
uint256 currentAllowance = token.allowance(address(this), spender);
if (currentAllowance < requestedDecrease) {
revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
}
forceApprove(token, spender, currentAllowance - requestedDecrease);
}
}
/**
* @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.encodeCall(token.approve, (spender, value));
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @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);
if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @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(token).code.length > 0;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)
pragma solidity ^0.8.20;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev The ETH balance of the account is not enough to perform the operation.
*/
error AddressInsufficientBalance(address account);
/**
* @dev There's no code at `target` (it is not a contract).
*/
error AddressEmptyCode(address target);
/**
* @dev A call to an address target failed. The target may have reverted.
*/
error FailedInnerCall();
/**
* @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
if (address(this).balance < amount) {
revert AddressInsufficientBalance(address(this));
}
(bool success, ) = recipient.call{value: amount}("");
if (!success) {
revert FailedInnerCall();
}
}
/**
* @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 or custom error, it is bubbled
* up by this function (like regular Solidity function calls). However, if
* the call reverted with no returned reason, this function reverts with a
* {FailedInnerCall} error.
*
* 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.
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0);
}
/**
* @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`.
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
if (address(this).balance < value) {
revert AddressInsufficientBalance(address(this));
}
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, success, returndata);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, success, returndata);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
* was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
* unsuccessful call.
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata
) internal view returns (bytes memory) {
if (!success) {
_revert(returndata);
} else {
// only check if target is a contract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
if (returndata.length == 0 && target.code.length == 0) {
revert AddressEmptyCode(target);
}
return returndata;
}
}
/**
* @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
* revert reason or with a default {FailedInnerCall} error.
*/
function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
if (!success) {
_revert(returndata);
} else {
return returndata;
}
}
/**
* @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
*/
function _revert(bytes memory returndata) 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 FailedInnerCall();
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)
pragma solidity ^0.8.20;
import {Math} from "./math/Math.sol";
import {SignedMath} from "./math/SignedMath.sol";
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant HEX_DIGITS = "0123456789abcdef";
uint8 private constant ADDRESS_LENGTH = 20;
/**
* @dev The `value` string doesn't fit in the specified `length`.
*/
error StringsInsufficientHexLength(uint256 value, uint256 length);
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
unchecked {
uint256 length = Math.log10(value) + 1;
string memory buffer = new string(length);
uint256 ptr;
/// @solidity memory-safe-assembly
assembly {
ptr := add(buffer, add(32, length))
}
while (true) {
ptr--;
/// @solidity memory-safe-assembly
assembly {
mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
}
value /= 10;
if (value == 0) break;
}
return buffer;
}
}
/**
* @dev Converts a `int256` to its ASCII `string` decimal representation.
*/
function toStringSigned(int256 value) internal pure returns (string memory) {
return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
unchecked {
return toHexString(value, Math.log256(value) + 1);
}
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
uint256 localValue = value;
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = HEX_DIGITS[localValue & 0xf];
localValue >>= 4;
}
if (localValue != 0) {
revert StringsInsufficientHexLength(value, length);
}
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
* representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
}
/**
* @dev Returns true if the two strings are equal.
*/
function equal(string memory a, string memory b) internal pure returns (bool) {
return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/ECDSA.sol)
pragma solidity ^0.8.20;
/**
* @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
*
* These functions can be used to verify that a message was signed by the holder
* of the private keys of a given address.
*/
library ECDSA {
enum RecoverError {
NoError,
InvalidSignature,
InvalidSignatureLength,
InvalidSignatureS
}
/**
* @dev The signature derives the `address(0)`.
*/
error ECDSAInvalidSignature();
/**
* @dev The signature has an invalid length.
*/
error ECDSAInvalidSignatureLength(uint256 length);
/**
* @dev The signature has an S value that is in the upper half order.
*/
error ECDSAInvalidSignatureS(bytes32 s);
/**
* @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
* return address(0) without also returning an error description. Errors are documented using an enum (error type)
* and a bytes32 providing additional information about the error.
*
* If no error is returned, then the address can be used for verification purposes.
*
* The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
*
* Documentation for signature generation:
* - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
* - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
*/
function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError, bytes32) {
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
/// @solidity memory-safe-assembly
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
return tryRecover(hash, v, r, s);
} else {
return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
}
}
/**
* @dev Returns the address that signed a hashed message (`hash`) with
* `signature`. This address can then be used for verification purposes.
*
* The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
* this function rejects them by requiring the `s` value to be in the lower
* half order, and the `v` value to be either 27 or 28.
*
* IMPORTANT: `hash` _must_ be the result of a hash operation for the
* verification to be secure: it is possible to craft signatures that
* recover to arbitrary addresses for non-hashed data. A safe way to ensure
* this is by receiving a hash of the original message (which may otherwise
* be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
*
* See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
*/
function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError, bytes32) {
unchecked {
bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
// We do not check for an overflow here since the shift operation results in 0 or 1.
uint8 v = uint8((uint256(vs) >> 255) + 27);
return tryRecover(hash, v, r, s);
}
}
/**
* @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
*/
function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Overload of {ECDSA-tryRecover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function tryRecover(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
) internal pure returns (address, RecoverError, bytes32) {
// EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
// unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
// the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
// signatures from current libraries generate a unique signature with an s-value in the lower half order.
//
// If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
// with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
// vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
// these malleable signatures as well.
if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
return (address(0), RecoverError.InvalidSignatureS, s);
}
// If the signature is valid (and not malleable), return the signer address
address signer = ecrecover(hash, v, r, s);
if (signer == address(0)) {
return (address(0), RecoverError.InvalidSignature, bytes32(0));
}
return (signer, RecoverError.NoError, bytes32(0));
}
/**
* @dev Overload of {ECDSA-recover} that receives the `v`,
* `r` and `s` signature fields separately.
*/
function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
(address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
_throwError(error, errorArg);
return recovered;
}
/**
* @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
*/
function _throwError(RecoverError error, bytes32 errorArg) private pure {
if (error == RecoverError.NoError) {
return; // no error: do nothing
} else if (error == RecoverError.InvalidSignature) {
revert ECDSAInvalidSignature();
} else if (error == RecoverError.InvalidSignatureLength) {
revert ECDSAInvalidSignatureLength(uint256(errorArg));
} else if (error == RecoverError.InvalidSignatureS) {
revert ECDSAInvalidSignatureS(errorArg);
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/MessageHashUtils.sol)
pragma solidity ^0.8.20;
import {Strings} from "../Strings.sol";
/**
* @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing.
*
* The library provides methods for generating a hash of a message that conforms to the
* https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712]
* specifications.
*/
library MessageHashUtils {
/**
* @dev Returns the keccak256 digest of an EIP-191 signed data with version
* `0x45` (`personal_sign` messages).
*
* The digest is calculated by prefixing a bytes32 `messageHash` with
* `"\x19Ethereum Signed Message:\n32"` and hashing the result. It corresponds with the
* hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
*
* NOTE: The `messageHash` parameter is intended to be the result of hashing a raw message with
* keccak256, although any bytes32 value can be safely used because the final digest will
* be re-hashed.
*
* See {ECDSA-recover}.
*/
function toEthSignedMessageHash(bytes32 messageHash) internal pure returns (bytes32 digest) {
/// @solidity memory-safe-assembly
assembly {
mstore(0x00, "\x19Ethereum Signed Message:\n32") // 32 is the bytes-length of messageHash
mstore(0x1c, messageHash) // 0x1c (28) is the length of the prefix
digest := keccak256(0x00, 0x3c) // 0x3c is the length of the prefix (0x1c) + messageHash (0x20)
}
}
/**
* @dev Returns the keccak256 digest of an EIP-191 signed data with version
* `0x45` (`personal_sign` messages).
*
* The digest is calculated by prefixing an arbitrary `message` with
* `"\x19Ethereum Signed Message:\n" + len(message)` and hashing the result. It corresponds with the
* hash signed when using the https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] JSON-RPC method.
*
* See {ECDSA-recover}.
*/
function toEthSignedMessageHash(bytes memory message) internal pure returns (bytes32) {
return
keccak256(bytes.concat("\x19Ethereum Signed Message:\n", bytes(Strings.toString(message.length)), message));
}
/**
* @dev Returns the keccak256 digest of an EIP-191 signed data with version
* `0x00` (data with intended validator).
*
* The digest is calculated by prefixing an arbitrary `data` with `"\x19\x00"` and the intended
* `validator` address. Then hashing the result.
*
* See {ECDSA-recover}.
*/
function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
return keccak256(abi.encodePacked(hex"19_00", validator, data));
}
/**
* @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`).
*
* The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with
* `\x19\x01` and hashing the result. It corresponds to the hash signed by the
* https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712.
*
* See {ECDSA-recover}.
*/
function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 digest) {
/// @solidity memory-safe-assembly
assembly {
let ptr := mload(0x40)
mstore(ptr, hex"19_01")
mstore(add(ptr, 0x02), domainSeparator)
mstore(add(ptr, 0x22), structHash)
digest := keccak256(ptr, 0x42)
}
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)
pragma solidity ^0.8.20;
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Muldiv operation overflow.
*/
error MathOverflowedMulDiv();
enum Rounding {
Floor, // Toward negative infinity
Ceil, // Toward positive infinity
Trunc, // Toward zero
Expand // Away from zero
}
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an overflow flag.
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// 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 (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds towards infinity instead
* of rounding towards zero.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
if (b == 0) {
// Guarantee the same behavior as in a regular Solidity division.
return a / b;
}
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
* denominator == 0.
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by
* Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0 = x * y; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
if (denominator <= prod1) {
revert MathOverflowedMulDiv();
}
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator.
// Always >= 1. See https://cs.stackexchange.com/q/138556/92363.
uint256 twos = denominator & (0 - denominator);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also
// works in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
* towards zero.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2 of a positive value rounded towards zero.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10 of a positive value rounded towards zero.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256 of a positive value rounded towards zero.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
}
}
/**
* @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
*/
function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
return uint8(rounding) % 2 == 1;
}
}// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.20;
/**
* @dev Standard signed math utilities missing in the Solidity language.
*/
library SignedMath {
/**
* @dev Returns the largest of two signed numbers.
*/
function max(int256 a, int256 b) internal pure returns (int256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two signed numbers.
*/
function min(int256 a, int256 b) internal pure returns (int256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two signed numbers without overflow.
* The result is rounded towards zero.
*/
function average(int256 a, int256 b) internal pure returns (int256) {
// Formula from the book "Hacker's Delight"
int256 x = (a & b) + ((a ^ b) >> 1);
return x + (int256(uint256(x) >> 255) & (a ^ b));
}
/**
* @dev Returns the absolute unsigned value of a signed value.
*/
function abs(int256 n) internal pure returns (uint256) {
unchecked {
// must be unchecked in order to support `n = type(int256).min`
return uint256(n >= 0 ? n : -n);
}
}
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
import { MessageHashUtils } from "@openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol";
library EIP712 {
bytes32 private constant TYPE_HASH =
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
/// @custom:storage-location erc7201:openzeppelin.storage.EIP712
struct EIP712Storage {
/// @custom:oz-renamed-from _HASHED_NAME
bytes32 _hashedName;
/// @custom:oz-renamed-from _HASHED_VERSION
bytes32 _hashedVersion;
string _name;
string _version;
}
function _getEIP712Storage() private pure returns (EIP712Storage storage data) {
bytes32 s = keccak256(abi.encode("io.infinex.EIP712"));
assembly {
data.slot := s
}
}
/**
* @dev Initializes the domain separator and parameter caches.
*
* The meaning of `name` and `version` is specified in
* https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
*
* - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
* - `version`: the current major version of the signing domain.
*
* NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
* contract upgrade].
*/
function __EIP712_init(string memory name, string memory version) internal {
__EIP712_init_unchained(name, version);
}
function __EIP712_init_unchained(string memory name, string memory version) internal {
EIP712Storage storage $ = _getEIP712Storage();
$._name = name;
$._version = version;
// Reset prior values in storage if upgrading
$._hashedName = 0;
$._hashedVersion = 0;
}
/**
* @dev Returns the domain separator for the current chain.
*/
function _domainSeparatorV4() internal view returns (bytes32) {
return _buildDomainSeparator();
}
function _buildDomainSeparator() private view returns (bytes32) {
return keccak256(abi.encode(TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash(), block.chainid, address(this)));
}
/**
* @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
* function returns the hash of the fully encoded EIP712 message for this domain.
*
* This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
*
* ```solidity
* bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
* keccak256("Mail(address to,string contents)"),
* mailTo,
* keccak256(bytes(mailContents))
* )));
* address signer = ECDSA.recover(digest, signature);
* ```
*/
function _hashTypedDataV4(bytes32 structHash) internal view returns (bytes32) {
return MessageHashUtils.toTypedDataHash(_domainSeparatorV4(), structHash);
}
/**
* @dev See {IERC-5267}.
*/
function eip712Domain()
internal
view
returns (
bytes1 fields,
string memory name,
string memory version,
uint256 chainId,
address verifyingContract,
bytes32 salt,
uint256[] memory extensions
)
{
EIP712Storage storage $ = _getEIP712Storage();
// If the hashed name and version in storage are non-zero, the contract hasn't been properly initialized
// and the EIP712 domain is not reliable, as it will be missing name and version.
// solhint-disable-next-line gas-custom-errors
require($._hashedName == 0 && $._hashedVersion == 0, "EIP712: Uninitialized");
return (
hex"0f", // 01111
_EIP712Name(),
_EIP712Version(),
block.chainid,
address(this),
bytes32(0),
new uint256[](0)
);
}
/**
* @dev The name parameter for the EIP712 domain.
*
* NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
* are a concern.
*/
function _EIP712Name() internal view returns (string memory) {
EIP712Storage storage $ = _getEIP712Storage();
return $._name;
}
/**
* @dev The version parameter for the EIP712 domain.
*
* NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs
* are a concern.
*/
function _EIP712Version() internal view returns (string memory) {
EIP712Storage storage $ = _getEIP712Storage();
return $._version;
}
/**
* @dev The hash of the name parameter for the EIP712 domain.
*
* NOTE: In previous versions this function was virtual. In this version you should override `_EIP712Name` instead.
*/
function _EIP712NameHash() internal view returns (bytes32) {
EIP712Storage storage $ = _getEIP712Storage();
string memory name = _EIP712Name();
if (bytes(name).length > 0) {
return keccak256(bytes(name));
} else {
// If the name is empty, the contract may have been upgraded without initializing the new storage.
// We return the name hash in storage if non-zero, otherwise we assume the name is empty by design.
bytes32 hashedName = $._hashedName;
if (hashedName != 0) {
return hashedName;
} else {
return keccak256("");
}
}
}
/**
* @dev The hash of the version parameter for the EIP712 domain.
*
* NOTE: In previous versions this function was virtual. In this version you should override `_EIP712Version` instead.
*/
function _EIP712VersionHash() internal view returns (bytes32) {
EIP712Storage storage $ = _getEIP712Storage();
string memory version = _EIP712Version();
if (bytes(version).length > 0) {
return keccak256(bytes(version));
} else {
// If the version is empty, the contract may have been upgraded without initializing the new storage.
// We return the version hash in storage if non-zero, otherwise we assume the version is empty by design.
bytes32 hashedVersion = $._hashedVersion;
if (hashedVersion != 0) {
return hashedVersion;
} else {
return keccak256("");
}
}
}
}// c=<
// |
// | ////\ 1@2
// @@ | /___\** @@@2 @@@@@@@@@@@@@@@@@@@@@@
// @@@ | |~L~ |* @@@@@@ @@@ @@@@@ @@@@ @@@ @@@@ @@@ @@@@@@@@ @@@@ @@@@ @@@ @@@@@@@@@ @@@@ @@@@
// @@@@@ | \=_/8 @@@@1@@ @@@ @@@@@ @@@@ @@@@ @@@ @@@@@ @@@ @@@@@@@@@ @@@@ @@@@@ @@@@ @@@@@@@@@ @@@@ @@@@
// @@@@@@| _ /| |\__ @@@@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@ @@@ @@@@ @@@@ @@@@@@ @@@@ @@@ @@@@@@@
// 1@@@@@@|\ \___/) @@1@@@@@2 ~~~ ~~~~~ @@@@ ~~@@ ~~~ ~~~~~~~~~~~ ~~~~ ~~~~ ~~~~~~~~~~~ ~@@ @@@@@
// 2@@@@@ | \ \ / | @@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@@@@@ @@@@@@@@@ @@@@ @@@@@@@@@@@ @@@@@@@@@ @@@@@
// 2@@@@ |_ > <|__ @@1@12 @@@ @@@@@ @@@@ @@@@ @@@ @@@@ @@@@@@ @@@@ @@@@ @@@@ @@@@@@ @@@ @@@@@@@
// @@@@ / _| / \/ \ @@1@ @@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@ @@@@ @@@@ @@@@ @@@@@ @@@@@@@@@ @@@@ @@@@
// @@ / |^\/ | | @@1 @@@ @@@@ @@@@ @@@ @@@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@@@@@ @@@@ @@@@
// / / ---- \ \\\= @@ @@@@@@@@@@@@@@@@@@@@@@
// \___/ -------- ~~ @@@
// @@ | | | | -- @@
// ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
// SPDX-Licence-Identifier: MIT
pragma solidity ^0.8.21;
/*
* @title IInfinexFaucet
* @notice Interface for the InfinexFaucet contract.
*/
interface IInfinexFaucet {
/*///////////////////////////////////////////////////////////////
STRUCTS
///////////////////////////////////////////////////////////////*/
struct ClaimRequest {
address recipientAddress;
uint256 claimAmount;
address tokenAddress;
uint256 tokenAmount;
uint256 nonce;
uint256 timestamp;
}
/*///////////////////////////////////////////////////////////////
EVENTS
///////////////////////////////////////////////////////////////*/
event ClaimSuccessful(
address _recipientAddress,
uint256 _claimAmount,
address _tokenAddress,
uint256 _tokenAmount,
uint256 _nonce,
uint256 _timestamp
);
event ClaimSignerSet(address _newClaimSigner);
event MaxEthPerClaimSet(uint256 _newMaxEthPerClaim);
event FeeCollectorSet(address _newFeeCollector);
event SignatureExpiryTimeSet(uint256 _newExpiryTime);
event WithdrawEth(address _recipient, uint256 _amount);
event WithdrawERC20(address _tokenAddress, uint256 _amount);
event Deposit(address _sender, uint256 _amount);
/*///////////////////////////////////////////////////////////////
ERRORS
///////////////////////////////////////////////////////////////*/
error EtherTransferFailed();
error InvalidClaimAmount();
error InvalidTokenAllowance();
error InvalidTimestamp();
error InvalidNonce();
error InvalidBalance();
error RequestExpired();
error InvalidSignature();
error ZeroExpiry();
error ZeroAmount();
/*///////////////////////////////////////////////////////////////
VIEW FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Returns the claim signer.
* @return The claim signer.
*/
function getClaimSigner() external view returns (address);
/**
* @notice Returns the maximum amount of ETH that can be claimed per claim.
* @return The maximum amount of ETH that can be claimed per claim.
*/
function getMaxEthPerClaim() external view returns (uint256);
/**
* @notice Returns the address that collects the fees.
* @return The address of the fee collector.
*/
function getFeeCollector() external view returns (address);
/**
* @notice Checks if a nonce has been claimed.
* @param _nonce The nonce to check.
* @return Whether the nonce has been claimed.
*/
function isClaimedNonce(uint256 _nonce) external view returns (bool);
/**
* @notice Returns the expiry time for the claim signature
* @return The expiry time for the claim signature
*/
function getSignatureExpiryTime() external view returns (uint256);
/*///////////////////////////////////////////////////////////////
MUTATIVE FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Initializes the contract.
* @param _claimSigner The address of the claim signer.
* @param _maxEthPerClaim The maximum amount of ETH that can be claimed per claim.
* @param _signatureExpiryTime The expiry time for the claim signature in seconds.
* @param _feeCollector The address of the fee collector.
*/
function initialize(address _claimSigner, uint256 _maxEthPerClaim, uint256 _signatureExpiryTime, address _feeCollector) external;
/**
* @notice Claims ETH from the faucet.
* @param _request The claim request.
* @param _claimSignature The claim signature.
*/
function claimEth(ClaimRequest calldata _request, bytes calldata _claimSignature) external;
/**
* @notice Sets the claim signer.
* @param _newClaimSigner The new claim signer.
*/
function setClaimSigner(address _newClaimSigner) external;
/**
* @notice Sets the maximum amount of ETH that can be claimed per claim.
* @param _newMaxEthPerClaim The new maximum amount of ETH that can be claimed per claim.
*/
function setMaxEthPerClaim(uint256 _newMaxEthPerClaim) external;
/**
* @notice Sets the address that collects the fees.
* @param _newFeeCollector The new fee collector.
*/
function setFeeCollector(address _newFeeCollector) external;
/**
* @notice Sets the expiry time for the claim signature
* @param _newExpiryTime The new expiry time for the claim signature
*/
function setSignatureExpiryTime(uint256 _newExpiryTime) external;
/**
* @notice Recovers the claim signer, from the claim signature.
* @param _request The claim request.
* @param _claimSignature The claim signature.
* @return The claim signer.
*/
function recoverClaimSigner(ClaimRequest calldata _request, bytes calldata _claimSignature) external view returns (address);
/**
* @notice Withdraws the specified amount of ETH to the owner.
* @param _amount The amount of ETH to withdraw.
*/
function withdrawEthToOwner(uint256 _amount) external;
/**
* @notice Withdraws the specified amount of the specified ERC20 token to the owner.
* @param _tokenAddress The address of the ERC20 token.
* @param _amount The amount of the ERC20 token to withdraw.
*/
function withdrawERC20ToOwner(address _tokenAddress, uint256 _amount) external;
}// c=<
// |
// | ////\ 1@2
// @@ | /___\** @@@2 @@@@@@@@@@@@@@@@@@@@@@
// @@@ | |~L~ |* @@@@@@ @@@ @@@@@ @@@@ @@@ @@@@ @@@ @@@@@@@@ @@@@ @@@@ @@@ @@@@@@@@@ @@@@ @@@@
// @@@@@ | \=_/8 @@@@1@@ @@@ @@@@@ @@@@ @@@@ @@@ @@@@@ @@@ @@@@@@@@@ @@@@ @@@@@ @@@@ @@@@@@@@@ @@@@ @@@@
// @@@@@@| _ /| |\__ @@@@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@ @@@ @@@@ @@@@ @@@@@@ @@@@ @@@ @@@@@@@
// 1@@@@@@|\ \___/) @@1@@@@@2 ~~~ ~~~~~ @@@@ ~~@@ ~~~ ~~~~~~~~~~~ ~~~~ ~~~~ ~~~~~~~~~~~ ~@@ @@@@@
// 2@@@@@ | \ \ / | @@@@@@2 @@@ @@@@@ @@@@ @@@@ @@@ @@@@@@@@@@@ @@@@@@@@@ @@@@ @@@@@@@@@@@ @@@@@@@@@ @@@@@
// 2@@@@ |_ > <|__ @@1@12 @@@ @@@@@ @@@@ @@@@ @@@ @@@@ @@@@@@ @@@@ @@@@ @@@@ @@@@@@ @@@ @@@@@@@
// @@@@ / _| / \/ \ @@1@ @@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@ @@@@ @@@@ @@@@ @@@@@ @@@@@@@@@ @@@@ @@@@
// @@ / |^\/ | | @@1 @@@ @@@@ @@@@ @@@ @@@@ @@@ @@@@ @@@@ @@@ @@@@ @@@@@@@@@ @@@@ @@@@
// / / ---- \ \\\= @@ @@@@@@@@@@@@@@@@@@@@@@
// \___/ -------- ~~ @@@
// @@ | | | | -- @@
// ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
// SPDX-Licence-Identifier: MIT
pragma solidity ^0.8.21;
library InfinexFaucetStorage {
bytes32 internal constant STORAGE_SLOT = keccak256("infinex.faucet.storage");
/**
* @notice Storage structure for the InfinexFaucet contract.
* @param claimSigner The address that signs the claim requests.
* @param feeCollector The address that collects the fees.`
* @param claimedNonces Mapping storing all claimed nonces.
* @param signatureExpiryTime The expiry time for the claim signature in seconds.
*/
struct Data {
address claimSigner;
address feeCollector;
uint256 maxEthPerClaim;
mapping(uint248 => uint256) claimedNonces;
uint256 signatureExpiryTime;
}
/**
* @notice Returns the storage data struct.
* @return ds The storage data struct.
*/
function getStorage() internal pure returns (Data storage ds) {
bytes32 slot = STORAGE_SLOT;
assembly {
ds.slot := slot
}
}
/**
* @notice Returns the signer that signs the claim requests.
* @return The address of the claim signer.
*/
function _getClaimSigner() internal view returns (address) {
return getStorage().claimSigner;
}
/**
* @notice Returns the address that collects the fees.
* @return The address of the fee collector.
*/
function _getFeeCollector() internal view returns (address) {
return getStorage().feeCollector;
}
/**
* @notice Returns the maximum amount of ETH that can be claimed per claim.
* @return The maximum amount of ETH that can be claimed per claim.
*/
function _getMaxEthPerClaim() internal view returns (uint256) {
return getStorage().maxEthPerClaim;
}
/**
* @notice Checks if a nonce has been claimed.
* @param _nonce The nonce to check.
* @return Whether the nonce has been claimed.
*/
function _isClaimedNonce(uint256 _nonce) internal view returns (bool) {
uint256 bitmap = getStorage().claimedNonces[uint248(_nonce >> 8)];
return (bitmap & (1 << (_nonce & 0xFF))) != 0;
}
/**
* @notice Returns the expiry time for the claim signature in seconds.
* @return The expiry time for the claim signature in seconds.
*/
function _getSignatureExpiryTime() internal view returns (uint256) {
return getStorage().signatureExpiryTime;
}
/**
* @notice Sets the signer that signs the claim requests.
* @param _signer The address of the claim signer.
*/
function _setClaimSigner(address _signer) internal {
getStorage().claimSigner = _signer;
}
/**
* @notice Sets the maximum amount of ETH that can be claimed per claim.
* @param _maxEthPerClaim The maximum amount of ETH that can be claimed per claim.
*/
function _setMaxEthPerClaim(uint256 _maxEthPerClaim) internal {
getStorage().maxEthPerClaim = _maxEthPerClaim;
}
/**
* @notice Sets the address that collects the fees.
* @param _collector The address of the fee collector.
*/
function _setFeeCollector(address _collector) internal {
getStorage().feeCollector = _collector;
}
/**
* @notice Sets the expiry in seconds for the claim signature.
* @param _expiry The expiry time for the claim signature in seconds.
*/
function _setSignatureExpiryTime(uint256 _expiry) internal {
getStorage().signatureExpiryTime = _expiry;
}
/**
* @notice Consumes a nonce, marking it as used
* @param _nonce The nonce to consume
*/
function _consumeNonce(uint256 _nonce) internal {
getStorage().claimedNonces[uint248(_nonce >> 8)] |= (1 << (_nonce & 0xFF));
}
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
library AddressUtil {
function isContract(address account) internal view returns (bool) {
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
/**
* @title Contract for facilitating ownership by a single address, using the Openzeppelin ownable upgradable storage slot.
* @dev Implementation is a modified version of Openzeppelin and Synthetix Ownable implementations.
*/
interface IOwnable {
/*///////////////////////////////////////////////////////////////
ERRORS
///////////////////////////////////////////////////////////////*/
/**
* @notice Thrown when an address tries to accept ownership but has not been nominated.
* @param addr The address that is trying to accept ownership.
*/
error NotNominated(address addr);
/**
* @notice Thrown when an address tries to renounce pending ownership but not owner or pending owner.
* @param addr The address that is trying to renounce pending ownership.
*/
error NotNominatedOrOwner(address addr);
/**
* @notice Thrown when an address is zero.
*/
error ZeroAddress();
/**
* @notice Thrown when no change is made.
*/
error NoChange();
/**
* @notice Thrown when an address is not the owner.
*/
error Unauthorized(address addr);
/*///////////////////////////////////////////////////////////////
EVENTS
///////////////////////////////////////////////////////////////*/
/**
* @notice Emitted when an address has been nominated.
* @param newOwner The address that has been nominated.
*/
event OwnerNominated(address newOwner);
/**
* @notice Emitted when the owner of the contract has changed.
* @param oldOwner The previous owner of the contract.
* @param newOwner The new owner of the contract.
*/
event OwnerChanged(address oldOwner, address newOwner);
/**
* @notice Emitted when the nominated pending owner renounces themselves as nominated.
* @param pendingOwner The pending owner that is renounced.
*/
event PendingOwnerRenounced(address pendingOwner);
/*///////////////////////////////////////////////////////////////
VIEW FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Returns the current owner of the contract.
*/
function owner() external view returns (address);
/**
* @notice Returns the current pending owner of the contract.
* @dev Only one address can be pending at a time.
*/
function pendingOwner() external view returns (address);
/*///////////////////////////////////////////////////////////////
MUTATIVE FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Allows a pending owner address to accept ownership of the contract.
* @dev Reverts if the caller has not been nominated.
*/
function acceptOwnership() external;
/**
* @notice Allows the current owner to nominate a new owner.
* @dev The pending owner will have to call `acceptOwnership` in a separate transaction in order to finalize the action and become the new contract owner.
* @param newOwner The address that is to become nominated.
*/
function transferOwnership(address newOwner) external;
/**
* @notice Allows a pending owner to reject the nomination.
*/
function renouncePendingOwnership() external;
/**
* @notice Allows the current owner of the contract to renounce the ownership and pending ownership completely.
*/
function renounceOwnership() external;
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
import { IOwnable } from "src/ownership/IOwnable.sol";
import { OwnableStorage } from "src/ownership/OwnableStorage.sol";
/**
* @title Contract for facilitating ownership by a single address, using the Openzeppelin ownable upgradable storage slot.
* @dev Implementation is a modified version of Openzeppelin and Synthetix Ownable implementations.
*/
abstract contract Ownable is IOwnable {
/*///////////////////////////////////////////////////////////////
CONSTRUCTOR
///////////////////////////////////////////////////////////////*/
constructor(address initialOwner) {
if (initialOwner == address(0)) revert ZeroAddress();
OwnableStorage._setOwner(initialOwner);
}
/*///////////////////////////////////////////////////////////////
MODIFIERS
///////////////////////////////////////////////////////////////*/
/**
* @notice Reverts if the caller is not the owner.
*/
modifier onlyOwner() {
_onlyOwner();
_;
}
/*///////////////////////////////////////////////////////////////
VIEW FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Returns the current owner of the contract.
*/
function owner() external view virtual returns (address) {
return _owner();
}
/**
* @notice Returns the current pending owner of the contract.
* @dev Only one address can be pending at a time.
*/
function pendingOwner() external view virtual returns (address) {
return _pendingOwner();
}
/*///////////////////////////////////////////////////////////////
INTERNAL FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Returns the current owner of the contract.
*/
function _owner() internal view virtual returns (address) {
return OwnableStorage._getOwner();
}
/**
* @notice Returns the current pending owner of the contract.
* @dev Only one address can be nominated at a time.
*/
function _pendingOwner() internal view virtual returns (address) {
return OwnableStorage._getPendingOwner();
}
/**
* @notice Reverts if the caller is not the owner.
*/
function _onlyOwner() internal view virtual {
if (msg.sender != _owner()) {
revert Unauthorized(msg.sender);
}
}
/*///////////////////////////////////////////////////////////////
MUTATIVE FUNCTIONS
///////////////////////////////////////////////////////////////*/
/**
* @notice Allows a pending owner to accept ownership of the contract.
* @dev Reverts if the caller is not pending owner.
*/
function acceptOwnership() public virtual {
address currentPendingOwner = _pendingOwner();
if (msg.sender != currentPendingOwner) {
revert NotNominated(msg.sender);
}
emit OwnerChanged(_owner(), currentPendingOwner);
OwnableStorage._setOwner(currentPendingOwner);
OwnableStorage._setPendingOwner(address(0));
}
/**
* @notice Allows the current owner to nominate a new owner.
* @dev The pending owner will have to call `acceptOwnership` in a separate transaction in order to finalize the action and become the new contract owner.
* @param newOwner The address that is to become nominated.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
if (newOwner == address(0)) {
revert ZeroAddress();
}
if (newOwner == _pendingOwner()) {
revert NoChange();
}
emit OwnerNominated(newOwner);
OwnableStorage._setPendingOwner(newOwner);
}
/**
* @notice Allows a pending owner or owner to reject the nomination.
*/
function renouncePendingOwnership() external virtual {
address pendingOwner = _pendingOwner();
if (pendingOwner != msg.sender && msg.sender != _owner()) {
revert NotNominatedOrOwner(msg.sender);
}
emit PendingOwnerRenounced(pendingOwner);
OwnableStorage._setPendingOwner(address(0));
}
/**
* @notice Allows the current owner of the contract to renounce the ownership and pending ownership completely.
*/
function renounceOwnership() public virtual onlyOwner {
emit PendingOwnerRenounced(_pendingOwner());
OwnableStorage._setPendingOwner(address(0));
emit OwnerChanged(_owner(), address(0));
OwnableStorage._setOwner(address(0));
}
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
/**
* @title Ownable Storage
* @dev This library provides storage and functions for managing the ownership of a contract, using the Openzeppelin ownable upgradable storage slot.
* Implementation is a modified version of Openzeppelin and Synthetix Ownable implementations.
*/
library OwnableStorage {
// Storage slot copied from the Openzeppelin ownable upgradable contract.
// https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/blob/master/contracts/access/OwnableUpgradeable.sol
// keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable")) - 1)) & ~bytes32(uint256(0xff))
bytes32 private constant _SLOT_OWNABLE_STORAGE = 0x9016d09d72d40fdae2fd8ceac6b6234c7706214fd39c1cd1e609a0528c199300; //#gitleaks:allow
struct Storage {
address _owner;
address _pendingOwner;
}
/**
* @notice Loads the storage data for the Ownable contract
* @return store The storage data for the Ownable contract
*/
function getStorage() internal pure returns (Storage storage store) {
bytes32 s = _SLOT_OWNABLE_STORAGE;
assembly {
store.slot := s
}
}
/**
* @notice Returns the current owner of the contract
* @return The address of the owner
*/
function _getOwner() internal view returns (address) {
return getStorage()._owner;
}
/**
* @notice Returns the pending owner of the contract.
* @return The address of the pending owner.
*/
function _getPendingOwner() internal view returns (address) {
return getStorage()._pendingOwner;
}
/**
* @notice Sets the owner in ownable storage.
* @param _newOwner The new owner of the contract.
*/
function _setOwner(address _newOwner) internal {
getStorage()._owner = _newOwner;
}
/**
* @notice Sets the pending owner.
* @param _newOwner The new pending owner of the contract.
*/
function _setPendingOwner(address _newOwner) internal {
getStorage()._pendingOwner = _newOwner;
}
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
/**
* @title Contract to be used as the implementation of a Universal Upgradeable Proxy Standard (UUPS) proxy.
* Important: A UUPS proxy requires its upgradeability functions to be in the implementation as opposed to the proxy.
* This means that if the proxy is upgraded to an implementation that does not support this interface, it will no longer be upgradeable.
* Copied from Synthetix
* https://github.com/Synthetixio/synthetix-v3/blob/main/utils/core-contracts/contracts/interfaces/IUUPSImplementation.sol
*/
interface IUUPSImplementation {
/**
* @notice Thrown when an incoming implementation will not be able to receive future upgrades.
*/
error ImplementationIsSterile(address implementation);
/**
* @notice Thrown intentionally when testing future upgradeability of an implementation.
*/
error UpgradeSimulationFailed();
/**
* @notice Thrown when the address is zero.
*/
error NullAddress();
/**
* @notice Thrown when the address is not a contract.
*/
error NotAContract(address implementation);
/**
* @notice Thrown when the implementation is the same as the current implementation.
*/
error SameImplementation();
/**
* @notice Emitted when the implementation of the proxy has been upgraded.
* @param self The address of the proxy whose implementation was upgraded.
* @param implementation The address of the proxy's new implementation.
*/
event Upgraded(address indexed self, address implementation);
/**
* @notice Allows the proxy to be upgraded to a new implementation.
* @param newImplementation The address of the proxy's new implementation.
* @dev Will revert if `newImplementation` is not upgradeable.
* @dev The implementation of this function needs to be protected by some sort of access control such as `onlyOwner`.
*/
function upgradeTo(address newImplementation) external;
/**
* @notice Function used to determine if a new implementation will be able to receive future upgrades in `upgradeTo`.
* @param newImplementation The address of the new implementation being tested for future upgradeability.
* @dev This function will always revert, but will revert with different error messages. The function `upgradeTo` uses this error to determine the future upgradeability of the implementation in question.
*/
function simulateUpgradeTo(address newImplementation) external;
/**
* @notice Retrieves the current implementation of the proxy.
* @return The address of the current implementation.
*/
function getImplementation() external view returns (address);
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
/**
* @dev Modified Synthetix proxy storage contract.
* https://github.com/Synthetixio/synthetix-v3/blob/main/utils/core-contracts/contracts/proxy/ProxyStorage.sol
*/
contract ProxyStorage {
// keccak256(abi.encode("io.synthetix.core-contracts.Proxy"));
bytes32 private constant _SLOT_PROXY_STORAGE = 0x5a648c35a2f5512218b4683cf10e03f5b7c9dc7346e1bf77d304ae97f60f592b; //#gitleaks:allow
struct ProxyStore {
address implementation;
bool simulatingUpgrade;
}
function _proxyStore() internal pure returns (ProxyStore storage store) {
bytes32 s = _SLOT_PROXY_STORAGE;
assembly {
store.slot := s
}
}
}//SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
import { IUUPSImplementation } from "src/proxy/IUUPSImplementation.sol";
import { AddressUtil } from "src/libraries/AddressUtil.sol";
import { ProxyStorage } from "src/proxy/ProxyStorage.sol";
/**
* @dev Modified Synthetix UUPS Implementation contract
* https://github.com/Synthetixio/synthetix-v3/blob/main/utils/core-contracts/contracts/proxy/UUPSImplementation.sol
*/
abstract contract UUPSImplementation is IUUPSImplementation, ProxyStorage {
/**
* @notice Function used to determine if a new implementation will be able to receive future upgrades in `upgradeTo`.
* @param newImplementation The address of the new implementation being tested for future upgradeability.
* @dev This function will always revert, but will revert with different error messages. The function `upgradeTo` uses this error to determine the future upgradeability of the implementation in question.
*/
function simulateUpgradeTo(address newImplementation) public override {
if (newImplementation == address(0)) {
revert NullAddress();
}
ProxyStore storage store = _proxyStore();
store.simulatingUpgrade = true;
address currentImplementation = store.implementation;
store.implementation = newImplementation;
// slither-disable-start controlled-delegatecall
// solhint-disable-next-line avoid-low-level-calls
(bool rollbackSuccessful,) = newImplementation.delegatecall(abi.encodeCall(this.upgradeTo, (currentImplementation)));
// slither-disable-end controlled-delegatecall
if (!rollbackSuccessful || _proxyStore().implementation != currentImplementation) {
revert UpgradeSimulationFailed();
}
store.simulatingUpgrade = false;
// solhint-disable-next-line reason-string,gas-custom-errors
revert();
}
/**
* @notice Retrieves the current implementation of the proxy.
* @return The address of the current implementation.
*/
function getImplementation() external view override returns (address) {
return _proxyStore().implementation;
}
/**
* @notice Allows the proxy to be upgraded to a new implementation.
* @param newImplementation The address of the new implementation.
* @dev Will revert if `newImplementation` is not upgradeable.
* @dev The implementation of this function needs to be protected by some sort of access control such as `onlyOwner`.
*/
function _upgradeTo(address newImplementation) internal virtual {
if (newImplementation == address(0)) {
revert NullAddress();
}
if (!AddressUtil.isContract(newImplementation)) {
revert NotAContract(newImplementation);
}
ProxyStore storage store = _proxyStore();
if (newImplementation == store.implementation) {
revert SameImplementation();
}
if (!store.simulatingUpgrade && _implementationIsSterile(newImplementation)) {
revert ImplementationIsSterile(newImplementation);
}
store.implementation = newImplementation;
emit Upgraded(address(this), newImplementation);
}
/**
* @notice Checks if the candidate implementation is sterile.
* @param candidateImplementation The address of the candidate implementation.
* @return True if the candidate implementation is sterile, false otherwise.
*/
function _implementationIsSterile(address candidateImplementation) internal virtual returns (bool) {
(bool simulationReverted, bytes memory simulationResponse) =
// solhint-disable-next-line avoid-low-level-calls
address(this).delegatecall(abi.encodeCall(this.simulateUpgradeTo, (candidateImplementation)));
return !simulationReverted
&& keccak256(abi.encodePacked(simulationResponse)) == keccak256(abi.encodePacked(UpgradeSimulationFailed.selector));
}
}{
"optimizer": {
"enabled": true,
"runs": 200
},
"evmVersion": "shanghai",
"remappings": [
"@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
"@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
"@pythnetwork/entropy-sdk-solidity/=node_modules/@pythnetwork/entropy-sdk-solidity/",
"@synthetixio/core-contracts/=node_modules/@synthetixio/core-contracts/",
"@synthetixio/core-modules/=node_modules/@synthetixio/core-modules/",
"@synthetixio/main/=node_modules/@synthetixio/main/",
"@synthetixio/oracle-manager/=node_modules/@synthetixio/oracle-manager/",
"@synthetixio/perps-market/=node_modules/@synthetixio/perps-market/",
"@synthetixio/spot-market/=node_modules/@synthetixio/spot-market/",
"ERC721A/=lib/ERC721A/contracts/",
"cannon-std/=lib/cannon-std/src/",
"ds-test/=lib/forge-std/lib/ds-test/src/",
"erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
"forge-std/=lib/forge-std/src/",
"openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
"openzeppelin-contracts/=lib/openzeppelin-contracts/",
"wormhole-circle-integration/=lib/wormhole-circle-integration/evm/src/",
"wormhole-solidity-sdk/=lib/wormhole-solidity-sdk/src/",
"wormhole/=lib/wormhole-circle-integration/evm/src/"
],
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}Contract ABI
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6"}],"name":"WithdrawEth","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"recipientAddress","type":"address"},{"internalType":"uint256","name":"claimAmount","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"tokenAmount","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"internalType":"struct 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IInfinexFaucet.ClaimRequest","name":"_request","type":"tuple"},{"internalType":"bytes","name":"_claimRequestSignature","type":"bytes"}],"name":"recoverClaimSigner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renouncePendingOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newClaimSigner","type":"address"}],"name":"setClaimSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newFeeCollector","type":"address"}],"name":"setFeeCollector","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaxEthPerClaim","type":"uint256"}],"name":"setMaxEthPerClaim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newExpiryTime","type":"uint256"}],"name":"setSignatureExpiryTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newImplementation","type":"address"}],"name":"simulateUpgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newImplementation","type":"address"}],"name":"upgradeTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawERC20ToOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawEthToOwner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]Contract Creation Code
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Multichain Portfolio | 35 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.