CrossChainDustCollector

{{
  "language": "Solidity",
  "sources": {
    "CrossChainDustCollector.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
// For Remix - use direct GitHub imports\r
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";\r
import "@openzeppelin/contracts/access/Ownable.sol";\r
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import "@openzeppelin/contracts/utils/Address.sol";\r
\r
interface IV2Router {\r
    function WETH() external pure returns (address);\r
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);\r
    function swapExactTokensForETH(\r
        uint amountIn,\r
        uint amountOutMin,\r
        address[] calldata path,\r
        address to,\r
        uint deadline\r
    ) external returns (uint[] memory amounts);\r
    function swapExactTokensForETHSupportingFeeOnTransferTokens(\r
        uint amountIn,\r
        uint amountOutMin,\r
        address[] calldata path,\r
        address to,\r
        uint deadline\r
    ) external;\r
}\r
\r
contract CrossChainDustCollector is ReentrancyGuard, Ownable {\r
    using Address for address;\r
    \r
    enum ChainType { ETHEREUM, BSC, POLYGON, ARBITRUM, OPTIMISM, AVALANCHE }\r
    \r
    struct ChainConfig {\r
        address v2Router;\r
        address nativeWrapper;\r
        uint256 minDustThreshold;\r
        uint256 gasPriceLimit;\r
    }\r
    \r
    mapping(ChainType => ChainConfig) public chainConfigs;\r
    ChainType public currentChain;\r
    \r
    uint256 public lastCollectionTime;\r
    uint256 public collectionInterval = 5 minutes;\r
    uint256 public constant SLIPPAGE_TOLERANCE = 300;\r
    \r
    mapping(address => bool) public blacklistedTokens;\r
    mapping(address => uint256) public lastCollected;\r
    uint256 public tokenCooldown = 5 minutes;\r
    \r
    uint256 public totalCollections;\r
    uint256 public totalNativeCollected;\r
    \r
    event DustCollected(address indexed token, uint256 amount, uint256 nativeReceived);\r
    event AutoCollectionExecuted(uint256 totalCollected, uint256 tokensProcessed, uint256 totalCollections);\r
    event ChainConfigured(ChainType chain, address router, uint256 threshold);\r
    event TokenBlacklisted(address indexed token);\r
    event EmergencyWithdraw(address indexed token, uint256 amount);\r
    \r
    // FIXED CONSTRUCTOR - added initialOwner parameter\r
    constructor(ChainType _chain, address initialOwner) Ownable(initialOwner) {\r
        currentChain = _chain;\r
        _setupDefaultChains();\r
    }\r
    \r
    function _setupDefaultChains() internal {\r
        chainConfigs[ChainType.ETHEREUM] = ChainConfig({\r
            v2Router: 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D,\r
            nativeWrapper: 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2,\r
            minDustThreshold: 0.0001 ether,\r
            gasPriceLimit: 30 gwei\r
        });\r
        \r
        chainConfigs[ChainType.BSC] = ChainConfig({\r
            v2Router: 0x10ED43C718714eb63d5aA57B78B54704E256024E,\r
            nativeWrapper: 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c,\r
            minDustThreshold: 0.001 ether,\r
            gasPriceLimit: 3 gwei\r
        });\r
        \r
        chainConfigs[ChainType.POLYGON] = ChainConfig({\r
            v2Router: 0xa5E0829CaCEd8fFDD4De3c43696c57F7D7A678ff,\r
            nativeWrapper: 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270,\r
            minDustThreshold: 0.1 ether,\r
            gasPriceLimit: 100 gwei\r
        });\r
\r
        chainConfigs[ChainType.ARBITRUM] = ChainConfig({\r
            v2Router: 0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506,\r
            nativeWrapper: 0x82aF49447D8a07e3bd95BD0d56f35241523fBab1,\r
            minDustThreshold: 0.0001 ether,\r
            gasPriceLimit: 0.03 gwei\r
        });\r
        \r
        chainConfigs[ChainType.OPTIMISM] = ChainConfig({\r
            v2Router: 0x9c12939390052919aF3155f41Bf4160Fd3666A6f,\r
            nativeWrapper: 0x4200000000000000000000000000000000000006,\r
            minDustThreshold: 0.0001 ether,\r
            gasPriceLimit: 0.03 gwei\r
        });\r
        \r
        chainConfigs[ChainType.AVALANCHE] = ChainConfig({\r
            v2Router: 0x60aE616a2155Ee3d9A68541Ba4544862310933d4,\r
            nativeWrapper: 0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7,\r
            minDustThreshold: 0.001 ether,\r
            gasPriceLimit: 15 gwei\r
        });\r
    }\r
    \r
    function executeAutoCollection() external nonReentrant onlyOwner returns (uint256 collectedAmount) {\r
        require(block.timestamp >= lastCollectionTime + collectionInterval, "Cooldown active");\r
        require(tx.gasprice <= chainConfigs[currentChain].gasPriceLimit, "Gas price too high");\r
        \r
        lastCollectionTime = block.timestamp;\r
        collectedAmount = 0;\r
        uint256 tokensProcessed = 0;\r
        \r
        address[] memory tokens = getTokensWithBalance();\r
        \r
        for (uint256 i = 0; i < tokens.length; i++) {\r
            if (_canCollectToken(tokens[i])) {\r
                uint256 balance = IERC20(tokens[i]).balanceOf(address(this));\r
                uint256 nativeReceived = _collectTokenDust(tokens[i], balance);\r
                \r
                if (nativeReceived > 0) {\r
                    collectedAmount += nativeReceived;\r
                    tokensProcessed++;\r
                    lastCollected[tokens[i]] = block.timestamp;\r
                }\r
            }\r
        }\r
        \r
        if (collectedAmount > 0) {\r
            (bool success, ) = owner().call{value: collectedAmount}("");\r
            require(success, "Native transfer failed");\r
        }\r
        \r
        totalCollections++;\r
        totalNativeCollected += collectedAmount;\r
        \r
        emit AutoCollectionExecuted(collectedAmount, tokensProcessed, totalCollections);\r
        return collectedAmount;\r
    }\r
    \r
    function forceCollection() external nonReentrant onlyOwner returns (uint256 collectedAmount) {\r
        collectedAmount = 0;\r
        uint256 tokensProcessed = 0;\r
        \r
        address[] memory tokens = getTokensWithBalance();\r
        \r
        for (uint256 i = 0; i < tokens.length; i++) {\r
            if (!blacklistedTokens[tokens[i]] && IERC20(tokens[i]).balanceOf(address(this)) > 0) {\r
                uint256 balance = IERC20(tokens[i]).balanceOf(address(this));\r
                uint256 nativeReceived = _collectTokenDust(tokens[i], balance);\r
                \r
                if (nativeReceived > 0) {\r
                    collectedAmount += nativeReceived;\r
                    tokensProcessed++;\r
                    lastCollected[tokens[i]] = block.timestamp;\r
                }\r
            }\r
        }\r
        \r
        if (collectedAmount > 0) {\r
            (bool success, ) = owner().call{value: collectedAmount}("");\r
            require(success, "Native transfer failed");\r
        }\r
        \r
        totalCollections++;\r
        totalNativeCollected += collectedAmount;\r
        \r
        emit AutoCollectionExecuted(collectedAmount, tokensProcessed, totalCollections);\r
        return collectedAmount;\r
    }\r
    \r
    function collectTokenDust(address token, uint256 amount) external nonReentrant onlyOwner returns (uint256) {\r
        require(_canCollectToken(token), "Cannot collect this token");\r
        \r
        uint256 nativeReceived = _collectTokenDust(token, amount);\r
        require(nativeReceived > 0, "No native received");\r
        \r
        (bool success, ) = owner().call{value: nativeReceived}("");\r
        require(success, "Native transfer failed");\r
        \r
        lastCollected[token] = block.timestamp;\r
        return nativeReceived;\r
    }\r
    \r
    function _collectTokenDust(address token, uint256 amount) internal returns (uint256) {\r
        if (token == chainConfigs[currentChain].nativeWrapper) {\r
            return amount;\r
        }\r
        \r
        uint256 nativeBefore = address(this).balance;\r
        \r
        IERC20(token).approve(chainConfigs[currentChain].v2Router, amount);\r
        \r
        address[] memory path = new address[](2);\r
        path[0] = token;\r
        path[1] = chainConfigs[currentChain].nativeWrapper;\r
        \r
        IV2Router router = IV2Router(chainConfigs[currentChain].v2Router);\r
        \r
        try router.swapExactTokensForETHSupportingFeeOnTransferTokens(\r
            amount,\r
            _calculateMinAmountOut(token, amount),\r
            path,\r
            address(this),\r
            block.timestamp + 120\r
        ) {\r
            // Success\r
        } catch {\r
            try router.swapExactTokensForETH(\r
                amount,\r
                _calculateMinAmountOut(token, amount),\r
                path,\r
                address(this),\r
                block.timestamp + 120\r
            ) {\r
                // Success\r
            } catch {\r
                blacklistedTokens[token] = true;\r
                emit TokenBlacklisted(token);\r
                return 0;\r
            }\r
        }\r
        \r
        uint256 nativeReceived = address(this).balance - nativeBefore;\r
        emit DustCollected(token, amount, nativeReceived);\r
        \r
        return nativeReceived;\r
    }\r
    \r
    function _canCollectToken(address token) internal view returns (bool) {\r
        return !blacklistedTokens[token] &&\r
               IERC20(token).balanceOf(address(this)) > 0 &&\r
               block.timestamp - lastCollected[token] >= tokenCooldown &&\r
               _isProfitableDust(token, IERC20(token).balanceOf(address(this)));\r
    }\r
    \r
    function _isProfitableDust(address token, uint256 amount) internal view returns (bool) {\r
        if (token == chainConfigs[currentChain].nativeWrapper) return true;\r
        \r
        try this.estimateOutput(token, amount) returns (uint256 estimatedOutput) {\r
            return estimatedOutput >= chainConfigs[currentChain].minDustThreshold;\r
        } catch {\r
            return false;\r
        }\r
    }\r
    \r
    function estimateOutput(address token, uint256 amount) external view returns (uint256) {\r
        if (token == chainConfigs[currentChain].nativeWrapper) return amount;\r
        \r
        address[] memory path = new address[](2);\r
        path[0] = token;\r
        path[1] = chainConfigs[currentChain].nativeWrapper;\r
        \r
        try IV2Router(chainConfigs[currentChain].v2Router).getAmountsOut(amount, path) returns (uint256[] memory amounts) {\r
            return amounts[1];\r
        } catch {\r
            return 0;\r
        }\r
    }\r
    \r
    function _calculateMinAmountOut(address token, uint256 amount) internal view returns (uint256) {\r
        uint256 estimated = this.estimateOutput(token, amount);\r
        return estimated * (10000 - SLIPPAGE_TOLERANCE) / 10000;\r
    }\r
    \r
    function getTokensWithBalance() public view returns (address[] memory) {\r
        address[] memory tokens = new address[](1);\r
        tokens[0] = chainConfigs[currentChain].nativeWrapper;\r
        return tokens;\r
    }\r
    \r
    function getPerformanceStats() external view returns (\r
        uint256 collections,\r
        uint256 totalNative,\r
        uint256 avgPerCollection\r
    ) {\r
        collections = totalCollections;\r
        totalNative = totalNativeCollected;\r
        avgPerCollection = collections > 0 ? totalNative / collections : 0;\r
        return (collections, totalNative, avgPerCollection);\r
    }\r
    \r
    function setChain(ChainType _chain) external onlyOwner {\r
        currentChain = _chain;\r
    }\r
    \r
    function setCollectionInterval(uint256 _interval) external onlyOwner {\r
        require(_interval >= 1 minutes, "Interval too short");\r
        collectionInterval = _interval;\r
    }\r
    \r
    function setTokenCooldown(uint256 _cooldown) external onlyOwner {\r
        require(_cooldown >= 1 minutes, "Cooldown too short");\r
        tokenCooldown = _cooldown;\r
    }\r
    \r
    function blacklistToken(address token) external onlyOwner {\r
        blacklistedTokens[token] = true;\r
        emit TokenBlacklisted(token);\r
    }\r
    \r
    function whitelistToken(address token) external onlyOwner {\r
        blacklistedTokens[token] = false;\r
    }\r
    \r
    function emergencyWithdrawToken(address token, uint256 amount) external onlyOwner {\r
        IERC20(token).transfer(owner(), amount);\r
        emit EmergencyWithdraw(token, amount);\r
    }\r
    \r
    function emergencyWithdrawNative() external onlyOwner {\r
        uint256 balance = address(this).balance;\r
        (bool success, ) = owner().call{value: balance}("");\r
        require(success, "Emergency withdraw failed");\r
    }\r
    \r
    receive() external payable {}\r
}"
    },
    "@openzeppelin/contracts/utils/Address.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/Address.sol)

pragma solidity ^0.8.20;

import {Errors} from "./Errors.sol";

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @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 Errors.InsufficientBalance(address(this).balance, amount);
        }

        (bool success, bytes memory returndata) = recipient.call{value: amount}("");
        if (!success) {
            _revert(returndata);
        }
    }

    /**
     * @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
     * {Errors.FailedCall} 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 Errors.InsufficientBalance(address(this).balance, value);
        }
        (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 {Errors.FailedCall}) 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 {Errors.FailedCall} 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 {Errors.FailedCall}.
     */
    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
            assembly ("memory-safe") {
                revert(add(returndata, 0x20), mload(returndata))
            }
        } else {
            revert Errors.FailedCall();
        }
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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);
}
"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/security/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}
"
    },
    "@openzeppelin/contracts/utils/Errors.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/Errors.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of common custom errors used in multiple contracts
 *
 * IMPORTANT: Backwards compatibility is not guaranteed in future versions of the library.
 * It is recommended to avoid relying on the error API for critical functionality.
 *
 * _Available since v5.1._
 */
library Errors {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error InsufficientBalance(uint256 balance, uint256 needed);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedCall();

    /**
     * @dev The deployment failed.
     */
    error FailedDeployment();

    /**
     * @dev A necessary precompile is missing.
     */
    error MissingPrecompile(address);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "runs": 200,
      "enabled": false
    },
    "remappings": [],
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "abi"
        ]
      }
    }
  }
}}