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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./interface/INFTXVault.sol";
import "./interface/INFTXVaultFactory.sol";
import "./testing/IERC1155.sol";
import "./testing/ERC721Holder.sol";
import "./testing/ERC1155Holder.sol";
import "./util/Ownable.sol";
import "./util/ReentrancyGuard.sol";
import "./util/SafeERC20.sol";


/**
 * @notice A partial WETH interface.
 */

interface IWETH {
  function deposit() external payable;
  function transfer(address to, uint value) external returns (bool);
  function withdraw(uint) external;
  function balanceOf(address to) external view returns (uint256);
}


/**
 * @notice Sets up a marketplace zap to interact with the 0x protocol. The 0x contract that
 * is hit later on handles the token conversion based on parameters that are sent from the
 * frontend.
 * 
 * @author Twade
 */

contract NFTXMarketplace0xZap is Ownable, ReentrancyGuard, ERC721Holder, ERC1155Holder {

  using SafeERC20 for IERC20;

  /// @notice Allows zap to be paused
  bool public paused = false;

  /// @notice Sets our 0x swap target
  address payable private immutable swapTarget;
  
  /// @notice An interface for the WETH contract
  IWETH public immutable WETH;

  /// @notice An interface for the NFTX Vault Factory contract
  INFTXVaultFactory public immutable nftxFactory;
  address public immutable feeDistributor;

  /// @notice The vToken threshold below which dust is sent to feeDistributor, else back to the user
  uint256 public dustThreshold;

  /// @notice A mapping of NFTX Vault IDs to their address corresponding vault contract address
  mapping(uint256 => address) public nftxVaultAddresses;

  // Set a constant address for specific contracts that need special logic
  address constant CRYPTO_PUNKS = 0xb47e3cd837dDF8e4c57F05d70Ab865de6e193BBB;

  /// @notice Emitted by the `buyAndRedeem` function.
  /// @param count The number of tokens affected by the event
  /// @param ethSpent The amount of ETH spent in the buy
  /// @param to The user affected by the event
  event Buy(uint256 count, uint256 ethSpent, address to);

  /// @notice Emitted by the `mintAndSell` functions.
  /// @param count The number of tokens affected by the event
  /// @param ethReceived The amount of ETH received in the sell
  /// @param to The user affected by the event
  event Sell(uint256 count, uint256 ethReceived, address to);

  /// @notice Emitted by the `buyAndSwap` functions.
  /// @param count The number of tokens affected by the event
  /// @param ethSpent The amount of ETH spent in the swap
  /// @param to The user affected by the event
  event Swap(uint256 count, uint256 ethSpent, address to);

  /// @notice Emitted when dust is returned after a transaction.
  /// @param ethAmount Amount of ETH returned to user
  /// @param vTokenAmount Amount of vToken returned to user
  /// @param to The user affected by the event
  event DustReturned(uint256 ethAmount, uint256 vTokenAmount, address to);


  /**
   * @notice Initialises our zap by setting contract addresses onto their
   * respective interfaces.
   * 
   * @param _nftxFactory NFTX Vault Factory contract address
   * @param _WETH WETH contract address
   * @param _swapTarget The swap target specified by the 0x protocol
   */

  constructor(address _nftxFactory, address _WETH, address payable _swapTarget, uint256 _dustThreshold) Ownable() ReentrancyGuard() {
    nftxFactory = INFTXVaultFactory(_nftxFactory);
    WETH = IWETH(_WETH);
    swapTarget = _swapTarget;
    feeDistributor = INFTXVaultFactory(_nftxFactory).feeDistributor();
    dustThreshold = _dustThreshold;
  }


  /**
   * @notice Mints tokens from our NFTX vault and sells them on 0x.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param ids An array of token IDs to be minted
   * @param swapCallData The `data` field from the API response
   * @param to The recipient of ETH from the tx
   */

  function mintAndSell721(
    uint256 vaultId,
    uint256[] calldata ids,
    bytes calldata swapCallData,
    address payable to
  ) external nonReentrant onlyOwnerIfPaused {
    // Check that we aren't burning tokens or sending to ourselves
    require(to != address(0) && to != address(this), 'Invalid recipient');

    // Check that we have been provided IDs
    require(ids.length != 0, 'Must send IDs');

    // Mint our 721s against the vault
    address vault = _mint721(vaultId, ids);

    // Sell our vault token for WETH
    uint256 amount = _fillQuote(vault, address(WETH), swapCallData);

    // convert WETH to ETH and send to `to`
    _transferAllWETH(to);

    // Emit our sale event
    emit Sell(ids.length, amount, to);

    // Handle vault token dust
    _transferDust(vault, false);
  }


  /**
   * @notice Purchases vault tokens from 0x with WETH and then swaps the tokens for
   * either random or specific token IDs from the vault. The specified recipient will
   * receive the ERC721 tokens, as well as any WETH dust that is left over from the tx.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param idsIn An array of random token IDs to be minted
   * @param specificIds An array of any specific token IDs to be minted
   * @param swapCallData The `data` field from the API response
   * @param to The recipient of the token IDs from the tx
   */

  function buyAndSwap721(
    uint256 vaultId, 
    uint256[] calldata idsIn, 
    uint256[] calldata specificIds,
    bytes calldata swapCallData,
    address payable to
  ) external payable nonReentrant onlyOwnerIfPaused {
    // Check that we aren't burning tokens or sending to ourselves
    require(to != address(0) && to != address(this), 'Invalid recipient');

    // Check that we have been provided IDs
    require(idsIn.length != 0, 'Must send IDs');

    // Check that we have a message value sent
    require(msg.value > 0, 'Invalid amount');

    // Wrap ETH into WETH for our contract from the sender
    WETH.deposit{value: msg.value}();

    // Get our NFTX vault
    address vault = _vaultAddress(vaultId);

    // Buy enough vault tokens to fuel our buy
    uint256 amount = _fillQuote(address(WETH), vault, swapCallData);

    // Swap our tokens for the IDs requested
    _swap721(vaultId, idsIn, specificIds, to);
    emit Swap(idsIn.length, amount, to);

    // Transfer dust ETH to sender and handle vault token dust
    _transferDust(vault, true);
  }


  /**
   * @notice Purchases vault tokens from 0x with WETH and then redeems the tokens for
   * either random or specific token IDs from the vault. The specified recipient will
   * receive the ERC721 tokens, as well as any WETH dust that is left over from the tx.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param amount The number of tokens to buy
   * @param specificIds An array of any specific token IDs to be minted
   * @param swapCallData The `data` field from the API response
   * @param to The recipient of the token IDs from the tx
   */

  function buyAndRedeem(
    uint256 vaultId,
    uint256 amount,
    uint256[] calldata specificIds, 
    bytes calldata swapCallData,
    address payable to
  ) external payable nonReentrant onlyOwnerIfPaused {
    // Check that we aren't burning tokens or sending to ourselves
    require(to != address(0) && to != address(this), 'Invalid recipient');

    // Check that we have an amount specified
    require(amount > 0, 'Must send amount');

    // Wrap ETH into WETH for our contract from the sender
    WETH.deposit{value: msg.value}();

    // Get our vault address information
    address vault = _vaultAddress(vaultId);

    // Buy vault tokens that will cover our transaction
    uint256 quoteAmount = _fillQuote(address(WETH), vault, swapCallData);

    // check if received sufficient vault tokens
    require(quoteAmount >= amount * 1e18, 'Insufficient vault tokens');

    // Redeem token IDs from the vault
    _redeem(vaultId, amount, specificIds, to);
    emit Buy(amount, quoteAmount, to);

    // Transfer dust ETH to sender and handle vault token dust
    _transferDust(vault, true);
  }


  /**
   * @notice Mints tokens from our NFTX vault and sells them on 0x.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param ids An array of token IDs to be minted
   * @param amounts The number of the corresponding ID to be minted
   * @param swapCallData The `data` field from the API response
   * @param to The recipient of ETH from the tx
   */

  function mintAndSell1155(
    uint256 vaultId,
    uint256[] calldata ids,
    uint256[] calldata amounts,
    bytes calldata swapCallData,
    address payable to
  ) external nonReentrant onlyOwnerIfPaused {
    // Check that we aren't burning tokens or sending to ourselves
    require(to != address(0) && to != address(this), 'Invalid recipient');

    // Get a sum of the total number of IDs we have sent up, and validate that
    // the data sent through is valid.
    (, uint totalAmount) = _validate1155Ids(ids, amounts);

    // Mint our 1155s against the vault
    address vault = _mint1155(vaultId, ids, amounts);

    // Sell our vault token for WETH
    uint256 amount = _fillQuote(vault, address(WETH), swapCallData);

    // convert WETH to ETH and send to `to`
    _transferAllWETH(to);

    // Emit our sale event
    emit Sell(totalAmount, amount, to);

    // Handle vault token dust
    _transferDust(vault, false);
  }


  /**
   * @notice Purchases vault tokens from 0x with WETH and then swaps the tokens for
   * either random or specific token IDs from the vault. The specified recipient will
   * receive the ERC1155 tokens, as well as any WETH dust that is left over from the tx.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param idsIn An array of random token IDs to be minted
   * @param specificIds An array of any specific token IDs to be minted
   * @param swapCallData The `data` field from the API response
   * @param to The recipient of token IDs from the tx
   */

  function buyAndSwap1155(
    uint256 vaultId, 
    uint256[] calldata idsIn,
    uint256[] calldata amounts,
    uint256[] calldata specificIds,
    bytes calldata swapCallData,
    address payable to
  ) external payable nonReentrant onlyOwnerIfPaused {
    // Check that we aren't burning tokens or sending to ourselves
    require(to != address(0) && to != address(this), 'Invalid recipient');

    // Check that we have a message value sent
    require(msg.value > 0, 'Invalid amount');

    // Get a sum of the total number of IDs we have sent up, and validate that
    // the data sent through is valid.
    (, uint totalAmount) = _validate1155Ids(idsIn, amounts);

    // Wrap ETH into WETH for our contract from the sender
    WETH.deposit{value: msg.value}();

    // Get our NFTX vault
    address vault = _vaultAddress(vaultId);

    // Buy enough vault tokens to fuel our buy
    uint256 amount = _fillQuote(address(WETH), vault, swapCallData);

    // Swap our tokens for the IDs requested
    _swap1155(vaultId, idsIn, amounts, specificIds, to);
    emit Swap(totalAmount, amount, to);

    // Transfer dust ETH to sender and handle vault token dust
    _transferDust(vault, true);
  }


  /**
   * @param vaultId The ID of the NFTX vault
   * @param ids An array of token IDs to be minted
   */

  function _mint721(uint256 vaultId, uint256[] memory ids) internal returns (address) {
    // Get our vault address information
    address vault = _vaultAddress(vaultId);

    // Transfer tokens from the message sender to the vault
    address assetAddress = INFTXVault(vault).assetAddress();
    uint256 length = ids.length;

    for (uint256 i; i < length;) {
      transferFromERC721(assetAddress, ids[i], vault);

      if (assetAddress == CRYPTO_PUNKS) {
        _approveERC721(assetAddress, ids[i], vault);
      }

      unchecked { ++i; }
    }

    // Mint our tokens from the vault to this contract
    uint256[] memory emptyIds;
    INFTXVault(vault).mint(ids, emptyIds);

    return vault;
  }


  /**
   * @param vaultId The ID of the NFTX vault
   * @param ids An array of token IDs to be minted
   * @param amounts An array of amounts whose indexes map to the ids array
   */

  function _mint1155(uint256 vaultId, uint256[] memory ids, uint256[] memory amounts) internal returns (address) {
    // Get our vault address information
    address vault = _vaultAddress(vaultId);

    // Transfer tokens from the message sender to the vault
    address assetAddress = INFTXVault(vault).assetAddress();
    IERC1155(assetAddress).safeBatchTransferFrom(msg.sender, address(this), ids, amounts, "");
    IERC1155(assetAddress).setApprovalForAll(vault, true);

    // Mint our tokens from the vault to this contract
    INFTXVault(vault).mint(ids, amounts);

    return vault;
  }


  /**
   * 
   * @param vaultId The ID of the NFTX vault
   * @param idsIn An array of token IDs to be minted
   * @param idsOut An array of token IDs to be redeemed
   * @param to The recipient of the idsOut from the tx
   */

  function _swap721(
    uint256 vaultId, 
    uint256[] memory idsIn,
    uint256[] memory idsOut,
    address to
  ) internal returns (address) {
    // Get our vault address information
    address vault = _vaultAddress(vaultId);

    // Transfer tokens to zap
    address assetAddress = INFTXVault(vault).assetAddress();
    uint256 length = idsIn.length;

    for (uint256 i; i < length;) {
      transferFromERC721(assetAddress, idsIn[i], vault);

      if (assetAddress == CRYPTO_PUNKS) {
        _approveERC721(assetAddress, idsIn[i], vault);
      }

      unchecked { ++i; }
    }

    // Swap our tokens
    uint256[] memory emptyIds;
    INFTXVault(vault).swapTo(idsIn, emptyIds, idsOut, to);

    return vault;
  }


  /**
   * @notice Swaps 1155 tokens, transferring them from the recipient to this contract, and
   * then sending them to the NFTX vault, that sends them to the recipient.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param idsIn The IDs owned by the sender to be swapped
   * @param amounts The number of each corresponding ID being swapped
   * @param idsOut The requested IDs to be swapped for
   * @param to The recipient of the swapped tokens
   * 
   * @return address The address of the NFTX vault
   */

  function _swap1155(
    uint256 vaultId, 
    uint256[] memory idsIn,
    uint256[] memory amounts,
    uint256[] memory idsOut,
    address to
  ) internal returns (address) {
    // Get our vault address information
    address vault = _vaultAddress(vaultId);

    // Transfer tokens to zap and mint to NFTX.
    address assetAddress = INFTXVault(vault).assetAddress();
    IERC1155(assetAddress).safeBatchTransferFrom(msg.sender, address(this), idsIn, amounts, "");
    IERC1155(assetAddress).setApprovalForAll(vault, true);
    INFTXVault(vault).swapTo(idsIn, amounts, idsOut, to);
    
    return vault;
  }


  /**
   * @notice Redeems tokens from a vault to a recipient.
   * 
   * @param vaultId The ID of the NFTX vault
   * @param amount The number of tokens to be redeemed
   * @param specificIds Specified token IDs if desired, otherwise will be _random_
   * @param to The recipient of the token
   */

  function _redeem(uint256 vaultId, uint256 amount, uint256[] memory specificIds, address to) internal {
    INFTXVault(_vaultAddress(vaultId)).redeemTo(amount, specificIds, to);
  }


  /**
   * @notice Transfers our ERC721 tokens to a specified recipient.
   * 
   * @param assetAddr Address of the asset being transferred
   * @param tokenId The ID of the token being transferred
   * @param to The address the token is being transferred to
   */

  function transferFromERC721(address assetAddr, uint256 tokenId, address to) internal virtual {
    bytes memory data;

    if (assetAddr == CRYPTO_PUNKS) {
      // Fix here for frontrun attack.
      bytes memory punkIndexToAddress = abi.encodeWithSignature("punkIndexToAddress(uint256)", tokenId);
      (bool checkSuccess, bytes memory result) = address(assetAddr).staticcall(punkIndexToAddress);
      (address nftOwner) = abi.decode(result, (address));
      require(checkSuccess && nftOwner == msg.sender, "Not the NFT owner");
      data = abi.encodeWithSignature("buyPunk(uint256)", tokenId);
    } else {
      // We push to the vault to avoid an unneeded transfer.
      data = abi.encodeWithSignature("safeTransferFrom(address,address,uint256)", msg.sender, to, tokenId);
    }

    (bool success, bytes memory resultData) = address(assetAddr).call(data);
    require(success, string(resultData));
  }


  /**
   * @notice Approves our ERC721 tokens to be transferred.
   * 
   * @dev This is only required to provide special logic for Cryptopunks.
   * 
   * @param assetAddr Address of the asset being transferred
   * @param tokenId The ID of the token being transferred
   * @param to The address the token is being transferred to
   */

  function _approveERC721(address assetAddr, uint256 tokenId, address to) internal virtual {
    if (assetAddr != CRYPTO_PUNKS) {
      return;
    }

    bytes memory data = abi.encodeWithSignature("offerPunkForSaleToAddress(uint256,uint256,address)", tokenId, 0, to);
    (bool success, bytes memory resultData) = address(assetAddr).call(data);
    require(success, string(resultData));
  }


  /**
   * @notice Swaps ERC20->ERC20 tokens held by this contract using a 0x-API quote.
   * 
   * @dev Must attach ETH equal to the `value` field from the API response.
   * 
   * @param sellToken The `sellTokenAddress` field from the API response
   * @param buyToken The `buyTokenAddress` field from the API response
   * @param swapCallData The `data` field from the API response
   */

  function _fillQuote(
    address sellToken,
    address buyToken,
    bytes calldata swapCallData
  ) internal returns (uint256) {
    // Track our balance of the buyToken to determine how much we've bought.
    uint256 boughtAmount = IERC20(buyToken).balanceOf(address(this));

    // Give `swapTarget` an infinite allowance to spend this contract's `sellToken`.
    // Note that for some tokens (e.g., USDT, KNC), you must first reset any existing
    // allowance to 0 before being able to update it.
    require(IERC20(sellToken).approve(swapTarget, type(uint256).max), 'Unable to approve contract');

    // Call the encoded swap function call on the contract at `swapTarget`
    (bool success,) = swapTarget.call(swapCallData);
    require(success, 'SWAP_CALL_FAILED');

    // Use our current buyToken balance to determine how much we've bought.
    return IERC20(buyToken).balanceOf(address(this)) - boughtAmount;
  }


  /**
   * @notice Transfers remaining ETH to msg.sender.
   * And transfers vault token dust to feeDistributor if below dustThreshold, else to msg.sender 
   * 
   * @param vault Address of the vault token
   * @param isWETHDust Checks and transfers WETH dust if boolean is true
   */

  function _transferDust(address vault, bool isWETHDust) internal {
    uint256 remaining;
    if(isWETHDust) {
      remaining = _transferAllWETH(msg.sender);
    }

    uint256 dustBalance = IERC20(vault).balanceOf(address(this));
    address dustRecipient;
    if(dustBalance > 0) {
      if (dustBalance > dustThreshold) {
        dustRecipient = msg.sender;
      } else {
        dustRecipient = feeDistributor;
      }

      IERC20(vault).transfer(dustRecipient, dustBalance);
    }

    emit DustReturned(remaining, dustBalance, dustRecipient);
  }

  function _transferAllWETH(address recipient) internal returns(uint256 amount) {
    amount = WETH.balanceOf(address(this));
    if (amount > 0) {
      // Unwrap our WETH into ETH and transfer it to the recipient
      WETH.withdraw(amount);
      (bool success, ) = payable(recipient).call{value: amount}("");
      require(success, "Unable to send unwrapped WETH");
    }
  }


  /**
   * @notice Allows 1155 IDs and amounts to be validated.
   * 
   * @param ids The IDs of the 1155 tokens.
   * @param amounts The number of each corresponding token to process.
   * 
   * @return totalIds The number of different IDs being sent.
   * @return totalAmount The total number of IDs being processed.
   */

  function _validate1155Ids(
    uint[] calldata ids,
    uint[] calldata amounts
  ) internal pure returns (
    uint totalIds,
    uint totalAmount
  ) {
    totalIds = ids.length;

    // Check that we have been provided IDs
    require(totalIds != 0, 'Must send IDs');
    require(totalIds <= amounts.length, 'Must define amounts against IDs');

    // Sum the amounts for our emitted events
    for (uint i; i < totalIds;) {
      require(amounts[i] > 0, 'Invalid 1155 amount');

      unchecked {
        totalAmount += amounts[i];
        ++i;
      }
    }
  }


  /**
   * @notice Maps a cached NFTX vault address against a vault ID.
   * 
   * @param vaultId The ID of the NFTX vault
   */

  function _vaultAddress(uint256 vaultId) internal returns (address) {
    if (nftxVaultAddresses[vaultId] == address(0)) {
      nftxVaultAddresses[vaultId] = nftxFactory.vault(vaultId);
    }

    require(nftxVaultAddresses[vaultId] != address(0), 'Vault does not exist');

    return nftxVaultAddresses[vaultId];
  }


  /**
   * @notice Allows our zap to be paused to prevent any processing.
   * 
   * @param _paused New pause state
   */

  function pause(bool _paused) external onlyOwner {
    paused = _paused;
  }

  /**
   * @notice Allows owner to modify dustThreshold value
   * 
   * @param _dustThreshold New dustThreshold
   */

  function setDustThreshold(uint256 _dustThreshold) external onlyOwner {
    dustThreshold = _dustThreshold;
  }


  /**
   * @notice Allows our owner to withdraw and tokens in the contract.
   * 
   * @param token The address of the token to be rescued
   */

  function rescue(address token) external onlyOwner {
    if (token == address(0)) {
      (bool success, ) = payable(msg.sender).call{value: address(this).balance}("");
      require(success, "Address: unable to send value");
    } else {
      IERC20(token).safeTransfer(msg.sender, IERC20(token).balanceOf(address(this)));
    }
  }


  /**
   * @notice A modifier that only allows the owner to interact with the function
   * if the contract is paused. If the contract is not paused then anyone can
   * interact with the function.
   */

  modifier onlyOwnerIfPaused() {
    require(!paused || msg.sender == owner(), "Zap is paused");
    _;
  }


  /**
   * @notice Allows our contract to receive any assets.
   */

  receive() external payable {}

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface INFTXEligibility {
    // Read functions.
    function name() external pure returns (string memory);

    function finalized() external view returns (bool);

    function targetAsset() external pure returns (address);

    function checkAllEligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool);

    function checkEligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool[] memory);

    function checkAllIneligible(uint256[] calldata tokenIds)
        external
        view
        returns (bool);

    function checkIsEligible(uint256 tokenId) external view returns (bool);

    // Write functions.
    function __NFTXEligibility_init_bytes(bytes calldata configData) external;

    function beforeMintHook(uint256[] calldata tokenIds) external;

    function afterMintHook(uint256[] calldata tokenIds) external;

    function beforeRedeemHook(uint256[] calldata tokenIds) external;

    function afterRedeemHook(uint256[] calldata tokenIds) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../token/IERC20Upgradeable.sol";
import "./INFTXVaultFactory.sol";
import "./INFTXEligibility.sol";

interface INFTXVault is IERC20Upgradeable {
    function manager() external view returns (address);

    function assetAddress() external view returns (address);

    function vaultFactory() external view returns (INFTXVaultFactory);

    function eligibilityStorage() external view returns (INFTXEligibility);

    function is1155() external view returns (bool);

    function allowAllItems() external view returns (bool);

    function enableMint() external view returns (bool);

    function enableRandomRedeem() external view returns (bool);

    function enableTargetRedeem() external view returns (bool);

    function enableRandomSwap() external view returns (bool);

    function enableTargetSwap() external view returns (bool);

    function vaultId() external view returns (uint256);

    function nftIdAt(uint256 holdingsIndex) external view returns (uint256);

    function allHoldings() external view returns (uint256[] memory);

    function totalHoldings() external view returns (uint256);

    function mintFee() external view returns (uint256);

    function randomRedeemFee() external view returns (uint256);

    function targetRedeemFee() external view returns (uint256);

    function randomSwapFee() external view returns (uint256);

    function targetSwapFee() external view returns (uint256);

    function vaultFees()
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        );

    event VaultInit(
        uint256 indexed vaultId,
        address assetAddress,
        bool is1155,
        bool allowAllItems
    );

    event ManagerSet(address manager);
    event EligibilityDeployed(uint256 moduleIndex, address eligibilityAddr);
    // event CustomEligibilityDeployed(address eligibilityAddr);

    event EnableMintUpdated(bool enabled);
    event EnableRandomRedeemUpdated(bool enabled);
    event EnableTargetRedeemUpdated(bool enabled);
    event EnableRandomSwapUpdated(bool enabled);
    event EnableTargetSwapUpdated(bool enabled);

    event Minted(uint256[] nftIds, uint256[] amounts, address to);
    event Redeemed(uint256[] nftIds, uint256[] specificIds, address to);
    event Swapped(
        uint256[] nftIds,
        uint256[] amounts,
        uint256[] specificIds,
        uint256[] redeemedIds,
        address to
    );

    function __NFTXVault_init(
        string calldata _name,
        string calldata _symbol,
        address _assetAddress,
        bool _is1155,
        bool _allowAllItems
    ) external;

    function finalizeVault() external;

    function setVaultMetadata(string memory name_, string memory symbol_)
        external;

    function setVaultFeatures(
        bool _enableMint,
        bool _enableRandomRedeem,
        bool _enableTargetRedeem,
        bool _enableRandomSwap,
        bool _enableTargetSwap
    ) external;

    function setFees(
        uint256 _mintFee,
        uint256 _randomRedeemFee,
        uint256 _targetRedeemFee,
        uint256 _randomSwapFee,
        uint256 _targetSwapFee
    ) external;

    function disableVaultFees() external;

    // This function allows for an easy setup of any eligibility module contract from the EligibilityManager.
    // It takes in ABI encoded parameters for the desired module. This is to make sure they can all follow
    // a similar interface.
    function deployEligibilityStorage(
        uint256 moduleIndex,
        bytes calldata initData
    ) external returns (address);

    // The manager has control over options like fees and features
    function setManager(address _manager) external;

    function mint(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts /* ignored for ERC721 vaults */
    ) external returns (uint256);

    function mintTo(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        address to
    ) external returns (uint256);

    function redeem(uint256 amount, uint256[] calldata specificIds)
        external
        returns (uint256[] calldata);

    function redeemTo(
        uint256 amount,
        uint256[] calldata specificIds,
        address to
    ) external returns (uint256[] calldata);

    function swap(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        uint256[] calldata specificIds
    ) external returns (uint256[] calldata);

    function swapTo(
        uint256[] calldata tokenIds,
        uint256[] calldata amounts, /* ignored for ERC721 vaults */
        uint256[] calldata specificIds,
        address to
    ) external returns (uint256[] calldata);

    function allValidNFTs(uint256[] calldata tokenIds)
        external
        view
        returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../proxy/IBeacon.sol";

interface INFTXVaultFactory is IBeacon {
    // Read functions.
    function numVaults() external view returns (uint256);

    function zapContract() external view returns (address);

    function zapContracts(address addr) external view returns (bool);

    function feeDistributor() external view returns (address);

    function eligibilityManager() external view returns (address);

    function vault(uint256 vaultId) external view returns (address);

    function allVaults() external view returns (address[] memory);

    function vaultsForAsset(address asset)
        external
        view
        returns (address[] memory);

    function isLocked(uint256 id) external view returns (bool);

    function excludedFromFees(address addr) external view returns (bool);

    function factoryMintFee() external view returns (uint64);

    function factoryRandomRedeemFee() external view returns (uint64);

    function factoryTargetRedeemFee() external view returns (uint64);

    function factoryRandomSwapFee() external view returns (uint64);

    function factoryTargetSwapFee() external view returns (uint64);

    function vaultFees(uint256 vaultId)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            uint256,
            uint256
        );

    event NewFeeDistributor(address oldDistributor, address newDistributor);
    event NewZapContract(address oldZap, address newZap);
    event UpdatedZapContract(address zap, bool excluded);
    event FeeExclusion(address feeExcluded, bool excluded);
    event NewEligibilityManager(address oldEligManager, address newEligManager);
    event NewVault(
        uint256 indexed vaultId,
        address vaultAddress,
        address assetAddress
    );
    event UpdateVaultFees(
        uint256 vaultId,
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    );
    event DisableVaultFees(uint256 vaultId);
    event UpdateFactoryFees(
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    );

    // Write functions.
    function __NFTXVaultFactory_init(
        address _vaultImpl,
        address _feeDistributor
    ) external;

    function createVault(
        string calldata name,
        string calldata symbol,
        address _assetAddress,
        bool is1155,
        bool allowAllItems
    ) external returns (uint256);

    function setFeeDistributor(address _feeDistributor) external;

    function setEligibilityManager(address _eligibilityManager) external;

    function setZapContract(address _zapContract, bool _excluded) external;

    function setFeeExclusion(address _excludedAddr, bool excluded) external;

    function setFactoryFees(
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    ) external;

    function setVaultFees(
        uint256 vaultId,
        uint256 mintFee,
        uint256 randomRedeemFee,
        uint256 targetRedeemFee,
        uint256 randomSwapFee,
        uint256 targetSwapFee
    ) external;

    function disableVaultFees(uint256 vaultId) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function childImplementation() external view returns (address);

    function upgradeChildTo(address newImplementation) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/utils/ERC1155Holder.sol)

pragma solidity ^0.8.0;

import "./ERC1155Receiver.sol";

/**
 * Simple implementation of `ERC1155Receiver` that will allow a contract to hold ERC1155 tokens.
 *
 * IMPORTANT: When inheriting this contract, you must include a way to use the received tokens, otherwise they will be
 * stuck.
 *
 * @dev _Available since v3.1._
 */
contract ERC1155Holder is ERC1155Receiver {
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(
        address,
        address,
        uint256[] memory,
        uint256[] memory,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC1155Receiver.sol";
import "./ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId
            || super.supportsInterface(interfaceId);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "./IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values);

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
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].
     */
    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

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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
    );
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../testing/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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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 {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../testing/IERC20.sol";
import "../testing/IERC20Permit.sol";
import "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(
                oldAllowance >= value,
                "SafeERC20: decreased allowance below zero"
            );
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(
                token,
                abi.encodeWithSelector(
                    token.approve.selector,
                    spender,
                    newAllowance
                )
            );
        }
    }

    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(
            nonceAfter == nonceBefore + 1,
            "SafeERC20: permit did not succeed"
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000be86f647b167567525ccaafcd6f881f1ee558216000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000def1c0ded9bec7f1a1670819833240f027b25eff000000000000000000000000000000000000000000000000000000003b9aca00

-----Decoded View---------------
Arg [0] : _nftxFactory (address): 0xBE86f647b167567525cCAAfcd6f881F1Ee558216
Arg [1] : _WETH (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [2] : _swapTarget (address): 0xDef1C0ded9bec7F1a1670819833240f027b25EfF
Arg [3] : _dustThreshold (uint256): 1000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000be86f647b167567525ccaafcd6f881f1ee558216
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [2] : 000000000000000000000000def1c0ded9bec7f1a1670819833240f027b25eff
Arg [3] : 000000000000000000000000000000000000000000000000000000003b9aca00