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// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "./LoanCommonEssential.sol";
import "../../utils/KeysMapping.sol";

contract LoanSimple is LoanCommonEssential {
    bytes32 public constant LOAN_TYPE = bytes32("DIRECT_LOAN_FIXED_OFFER");

    constructor(
        address _admin,
        address _dispatcher,
        address[] memory _allowedERC20s
    )
        LoanCommonEssential(
            _admin,
            _dispatcher,
            KeysMapping.keyToId("DIRECT_LOAN_COORDINATOR"),
            _allowedERC20s
        )
    {
        // solhint-disable-previous-line no-empty-blocks
    }

    function acceptOffer(
        Offer memory _offer,
        Signature memory _signature,
        BorrowerSettings memory _borrowerSettings
    ) external whenNotPaused nonReentrant {
        address nftWrapper = _getWrapper(_offer.nftCollateralContract);
        _loanSanityChecks(_offer, nftWrapper);
        _loanSanityChecksOffer(_offer);
        _acceptOffer(
            LOAN_TYPE,
            _setupLoanTerms(_offer, nftWrapper),
            _setupLoanExtras(_borrowerSettings.revenueSharePartner, _borrowerSettings.referralFeeInBasisPoints),
            _offer,
            _signature
        );
    }

    function computePayoffAmount(uint32 _loanId) external view override returns (uint256) {
        LoanTerms storage loan = loanIdToLoan[_loanId];
        return loan.maximumRepaymentAmount;
    }

    function _acceptOffer(
        bytes32 _loanType,
        LoanTerms memory _loanTerms,
        LoanExtras memory _loanExtras,
        Offer memory _offer,
        Signature memory _signature
    ) internal {
        require(!_nonceHasBeenUsedForUser[_signature.signer][_signature.nonce], "Lender nonce invalid");

        _nonceHasBeenUsedForUser[_signature.signer][_signature.nonce] = true;

        require(SignHelper.checkLenderSignatureValidity(_offer, _signature), "Lender signature is invalid");

        address bundle = hub.getContract(KeysMapping.LIQUIDOTS_BUNDLER);
        require(_loanTerms.nftCollateralContract != bundle, "Collateral cannot be bundle");

        uint32 loanId = _createLoan(_loanType, _loanTerms, _loanExtras, msg.sender, _signature.signer, _offer.referrer);

        // Emit an event with all relevant details from this transaction.
        emit LoanStarted(loanId, msg.sender, _signature.signer, _loanTerms, _loanExtras);
    }

    function _setupLoanTerms(Offer memory _offer, address _nftWrapper) internal view returns (LoanTerms memory) {
        return
            LoanTerms({
                loanERC20Denomination: _offer.loanERC20Denomination,
                loanPrincipalAmount: _offer.loanPrincipalAmount,
                maximumRepaymentAmount: _offer.maximumRepaymentAmount,
                nftCollateralContract: _offer.nftCollateralContract,
                nftCollateralWrapper: _nftWrapper,
                nftCollateralId: _offer.nftCollateralId,
                loanStartTime: uint64(block.timestamp),
                loanDuration: _offer.loanDuration,
                loanInterestRateForDurationInBasisPoints: uint16(0),
                loanAdminFeeInBasisPoints: _offer.loanAdminFeeInBasisPoints,
                borrower: msg.sender
            });
    }

    function _payoffAndFee(LoanTerms memory _loanTerms)
        internal
        pure
        override
        returns (uint256 adminFee, uint256 payoffAmount)
    {
        // Calculate amounts to send to lender and admins
        uint256 interestDue = _loanTerms.maximumRepaymentAmount - _loanTerms.loanPrincipalAmount;
        adminFee = LoanComputations.getAdminFee(
            interestDue,
            uint256(_loanTerms.loanAdminFeeInBasisPoints)
        );
        payoffAmount = _loanTerms.maximumRepaymentAmount - adminFee;
    }

    function _loanSanityChecksOffer(LoanStructures.Offer memory _offer) internal pure {
        require(
            _offer.maximumRepaymentAmount >= _offer.loanPrincipalAmount,
            "Negative interest rate loans are not allowed."
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "./ILoanCommon.sol";
import "./LoanStructures.sol";
import "./LoanComputations.sol";
import "./LoanAirdropHelper.sol";
import "../MainLoan.sol";
import "../../utils/NftAcceptor.sol";
import "../../utils/SignHelper.sol";
import "../../interfaces/IDispatcher.sol";
import "../../utils/KeysMapping.sol";
import "../../interfaces/ILoanManager.sol";
import "../../interfaces/INftWrapper.sol";
import "../../interfaces/IAllowedPartners.sol";
import "../../interfaces/IAllowedERC20s.sol";
import "../../interfaces/IAllowedNFTs.sol";

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

abstract contract LoanCommonEssential is ILoanCommon, IAllowedERC20s, MainLoan, NftAcceptor, LoanStructures {
    using SafeERC20 for IERC20;

    uint16 public constant HUNDRED_PERCENT = 10000;

    bytes32 public immutable override LOAN_COORDINATOR;

    uint256 public override maximumLoanDuration = 53 weeks;

    uint16 public override adminFeeInBasisPoints = 25;

    mapping(uint32 => LoanTerms) public override loanIdToLoan;
    mapping(uint32 => LoanExtras) public loanIdToLoanExtras;

    mapping(uint32 => bool) public override loanRepaidOrLiquidated;

    mapping(address => mapping(uint256 => uint256)) private _escrowTokens;

    mapping(address => mapping(uint256 => bool)) internal _nonceHasBeenUsedForUser;

    mapping(address => bool) private erc20Permits;

    IDispatcher public immutable hub;

    event AdminFeeUpdated(uint16 newAdminFee);

    event MaximumLoanDurationUpdated(uint256 newMaximumLoanDuration);

    event LoanStarted(
        uint32 indexed loanId,
        address indexed borrower,
        address indexed lender,
        LoanTerms loanTerms,
        LoanExtras loanExtras
    );

    event LoanRepaid(
        uint32 indexed loanId,
        address indexed borrower,
        address indexed lender,
        uint256 loanPrincipalAmount,
        uint256 nftCollateralId,
        uint256 amountPaidToLender,
        uint256 adminFee,
        uint256 revenueShare,
        address revenueSharePartner,
        address nftCollateralContract,
        address loanERC20Denomination
    );

    event LoanLiquidated(
        uint32 indexed loanId,
        address indexed borrower,
        address indexed lender,
        uint256 loanPrincipalAmount,
        uint256 nftCollateralId,
        uint256 loanMaturityDate,
        uint256 loanLiquidationDate,
        address nftCollateralContract
    );

    event LoanRenegotiated(
        uint32 indexed loanId,
        address indexed borrower,
        address indexed lender,
        uint32 newLoanDuration,
        uint256 newMaximumRepaymentAmount,
        uint256 renegotiationFee,
        uint256 renegotiationAdminFee
    );

    event ERC20Permit(address indexed erc20Contract, bool isPermitted);

    constructor(
        address _admin,
        address _dispatcher,
        bytes32 _loanCoordinatorKey,
        address[] memory _allowedERC20s
    ) MainLoan(_admin) {
        hub = IDispatcher(_dispatcher);
        LOAN_COORDINATOR = _loanCoordinatorKey;
        for (uint256 i = 0; i < _allowedERC20s.length; i++) {
            _setERC20Permit(_allowedERC20s[i], true);
        }
    }

    function updateMaximumLoanDuration(uint256 _newMaximumLoanDuration) external onlyOwner {
        require(_newMaximumLoanDuration <= uint256(type(uint32).max), "Loan duration overflow");
        maximumLoanDuration = _newMaximumLoanDuration;
        emit MaximumLoanDurationUpdated(_newMaximumLoanDuration);
    }

    function updateAdminFee(uint16 _newAdminFeeInBasisPoints) external onlyOwner {
        require(_newAdminFeeInBasisPoints <= HUNDRED_PERCENT, "basis points > 10000");
        adminFeeInBasisPoints = _newAdminFeeInBasisPoints;
        emit AdminFeeUpdated(_newAdminFeeInBasisPoints);
    }

    function pipeERC20Airdrop(address _tokenAddress, address _receiver) external onlyOwner {
        IERC20 tokenContract = IERC20(_tokenAddress);
        uint256 amount = tokenContract.balanceOf(address(this));
        require(amount > 0, "no tokens owned");
        tokenContract.safeTransfer(_receiver, amount);
    }

    function setERC20Permit(address _erc20, bool _permit) external onlyOwner {
        _setERC20Permit(_erc20, _permit);
    }

    function setERC20Permits(address[] memory _erc20s, bool[] memory _permits) external onlyOwner {
        require(_erc20s.length == _permits.length, "setERC20Permits function information arity mismatch");

        for (uint256 i = 0; i < _erc20s.length; i++) {
            _setERC20Permit(_erc20s[i], _permits[i]);
        }
    }

    function pipeERC721Airdrop(
        address _tokenAddress,
        uint256 _tokenId,
        address _receiver
    ) external onlyOwner {
        IERC721 tokenContract = IERC721(_tokenAddress);
        require(_escrowTokens[_tokenAddress][_tokenId] == 0, "token is collateral");
        require(tokenContract.ownerOf(_tokenId) == address(this), "nft not owned");
        tokenContract.safeTransferFrom(address(this), _receiver, _tokenId);
    }

    function pipeERC1155Airdrop(
        address _tokenAddress,
        uint256 _tokenId,
        address _receiver
    ) external onlyOwner {
        IERC1155 tokenContract = IERC1155(_tokenAddress);
        uint256 amount = tokenContract.balanceOf(address(this), _tokenId);
        require(_escrowTokens[_tokenAddress][_tokenId] == 0, "token is collateral");
        require(amount > 0, "no nfts owned");
        tokenContract.safeTransferFrom(address(this), _receiver, _tokenId, amount, "");
    }

    function mintObligationReceipt(uint32 _loanId) external nonReentrant {
        address borrower = loanIdToLoan[_loanId].borrower;
        require(msg.sender == borrower, "sender has to be borrower");

        ILoanManager loanCoordinator = ILoanManager(hub.getContract(LOAN_COORDINATOR));
        loanCoordinator.mintObligationReceipt(_loanId, borrower);

        delete loanIdToLoan[_loanId].borrower;
    }

    function renegotiateLoan(
        uint32 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        uint256 _lenderNonce,
        uint256 _expiry,
        bytes memory _lenderSignature
    ) external whenNotPaused nonReentrant {
        _renegotiateLoan(
            _loanId,
            _newLoanDuration,
            _newMaximumRepaymentAmount,
            _renegotiationFee,
            _lenderNonce,
            _expiry,
            _lenderSignature
        );
    }

    function payBackLoan(uint32 _loanId) external nonReentrant {
        LoanComputations.validatePayback(_loanId, hub);
        (
            address borrower,
            address lender,
            LoanTerms memory loan,
            ILoanManager loanCoordinator
        ) = _getLoanData(_loanId);

        _payBackLoan(_loanId, borrower, lender, loan);

        _resolveLoan(_loanId, borrower, loan, loanCoordinator);

        // Delete the loan from storage in order to achieve a substantial gas savings and to lessen the burden of
        // storage on Ethereum nodes, since we will never access this loan's details again, and the details are still
        // available through event data.
        delete loanIdToLoan[_loanId];
        delete loanIdToLoanExtras[_loanId];
    }

    function liquidateExpiredLoan(uint32 _loanId) external nonReentrant {
        LoanComputations.checkLoanIdValidity(_loanId, hub);
        // Sanity check that payBackLoan() and liquidateExpiredLoan() have never been called on this loanId.
        // Depending on how the rest of the code turns out, this check may be unnecessary.
        require(!loanRepaidOrLiquidated[_loanId], "Loan already repaid/liquidated");

        (
            address borrower,
            address lender,
            LoanTerms memory loan,
            ILoanManager loanCoordinator
        ) = _getLoanData(_loanId);

        // Ensure that the loan is indeed overdue, since we can only liquidate overdue loans.
        uint256 loanMaturityDate = uint256(loan.loanStartTime) + uint256(loan.loanDuration);
        require(block.timestamp > loanMaturityDate, "Loan is not overdue yet");

        require(msg.sender == lender, "Only lender can liquidate");

        _resolveLoan(_loanId, lender, loan, loanCoordinator);

        // Emit an event with all relevant details from this transaction.
        emit LoanLiquidated(
            _loanId,
            borrower,
            lender,
            loan.loanPrincipalAmount,
            loan.nftCollateralId,
            loanMaturityDate,
            block.timestamp,
            loan.nftCollateralContract
        );

        // Delete the loan from storage in order to achieve a substantial gas savings and to lessen the burden of
        // storage on Ethereum nodes, since we will never access this loan's details again, and the details are still
        // available through event data.
        delete loanIdToLoan[_loanId];
        delete loanIdToLoanExtras[_loanId];
    }

    function pullAirdrop(
        uint32 _loanId,
        address _target,
        bytes calldata _data,
        address _nftAirdrop,
        uint256 _nftAirdropId,
        bool _is1155,
        uint256 _nftAirdropAmount
    ) external nonReentrant {
        LoanComputations.checkLoanIdValidity(_loanId, hub);
        require(!loanRepaidOrLiquidated[_loanId], "Loan already repaid/liquidated");

        LoanTerms memory loan = loanIdToLoan[_loanId];

        LoanAirdropHelper.pullAirdrop(
            _loanId,
            loan,
            _target,
            _data,
            _nftAirdrop,
            _nftAirdropId,
            _is1155,
            _nftAirdropAmount,
            hub
        );
    }

    function wrapCollateral(uint32 _loanId) external nonReentrant {
        LoanComputations.checkLoanIdValidity(_loanId, hub);
        require(!loanRepaidOrLiquidated[_loanId], "Loan already repaid/liquidated");

        LoanTerms storage loan = loanIdToLoan[_loanId];

        _escrowTokens[loan.nftCollateralContract][loan.nftCollateralId] -= 1;
        (address instance, uint256 receiverId) = LoanAirdropHelper.wrapCollateral(_loanId, loan, hub);
        _escrowTokens[instance][receiverId] += 1;
    }

    function cancelNonceForUser(uint256 _nonce) external {
        require(!_nonceHasBeenUsedForUser[msg.sender][_nonce], "Invalid nonce");
        _nonceHasBeenUsedForUser[msg.sender][_nonce] = true;
    }

    function computePayoffAmount(uint32 _loanId) external view virtual returns (uint256);

    function hasNonceBeenUsedForUser(address _user, uint256 _nonce) external view override returns (bool) {
        return _nonceHasBeenUsedForUser[_user][_nonce];
    }

    function isERC20Permitted(address _erc20) public view override returns (bool) {
        return erc20Permits[_erc20];
    }

    function _renegotiateLoan(
        uint32 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        uint256 _lenderNonce,
        uint256 _expiry,
        bytes memory _lenderSignature
    ) internal {
        LoanTerms storage loan = loanIdToLoan[_loanId];

        (address borrower, address lender) = LoanComputations.validateRenegotiation(
            loan,
            _loanId,
            _newLoanDuration,
            _newMaximumRepaymentAmount,
            _lenderNonce,
            hub
        );

        _nonceHasBeenUsedForUser[lender][_lenderNonce] = true;

        require(
            SignHelper.checkLenderRenegotiationSignatureValidity(
                _loanId,
                _newLoanDuration,
                _newMaximumRepaymentAmount,
                _renegotiationFee,
                Signature({signer: lender, nonce: _lenderNonce, expiry: _expiry, signature: _lenderSignature})
            ),
            "Renegotiation signature is invalid"
        );

        uint256 renegotiationAdminFee;

        if (_renegotiationFee > 0) {
            renegotiationAdminFee = LoanComputations.getAdminFee(
                _renegotiationFee,
                loan.loanAdminFeeInBasisPoints
            );
            // Transfer principal-plus-interest-minus-fees from the caller (always has to be borrower) to lender
            IERC20(loan.loanERC20Denomination).safeTransferFrom(
                borrower,
                lender,
                _renegotiationFee - renegotiationAdminFee
            );
            // Transfer fees from the caller (always has to be borrower) to admins
            IERC20(loan.loanERC20Denomination).safeTransferFrom(borrower, owner(), renegotiationAdminFee);
        }

        loan.loanDuration = _newLoanDuration;
        loan.maximumRepaymentAmount = _newMaximumRepaymentAmount;

        emit LoanRenegotiated(
            _loanId,
            borrower,
            lender,
            _newLoanDuration,
            _newMaximumRepaymentAmount,
            _renegotiationFee,
            renegotiationAdminFee
        );
    }

    function _createLoan(
        bytes32 _loanType,
        LoanTerms memory _loanTerms,
        LoanExtras memory _loanExtras,
        address _borrower,
        address _lender,
        address _referrer
    ) internal returns (uint32) {
        // Transfer collateral from borrower to this contract to be held until
        // loan completion.
        _transferNFT(_loanTerms, _borrower, address(this));

        return _createLoanNoNftTransfer(_loanType, _loanTerms, _loanExtras, _borrower, _lender, _referrer);
    }

    function _createLoanNoNftTransfer(
        bytes32 _loanType,
        LoanTerms memory _loanTerms,
        LoanExtras memory _loanExtras,
        address _borrower,
        address _lender,
        address _referrer
    ) internal returns (uint32 loanId) {
        _escrowTokens[_loanTerms.nftCollateralContract][_loanTerms.nftCollateralId] += 1;

        uint256 referralfee = LoanComputations.getReferralFee(
            _loanTerms.loanPrincipalAmount,
            _loanExtras.referralFeeInBasisPoints,
            _referrer
        );
        uint256 principalAmount = _loanTerms.loanPrincipalAmount - referralfee;
        if (referralfee > 0) {
            // Transfer the referral fee from lender to referrer.
            IERC20(_loanTerms.loanERC20Denomination).safeTransferFrom(_lender, _referrer, referralfee);
        }
        // Transfer principal from lender to borrower.
        IERC20(_loanTerms.loanERC20Denomination).safeTransferFrom(_lender, _borrower, principalAmount);

        // Issue an ERC721 promissory note to the lender that gives them the
        // right to either the principal-plus-interest or the collateral,
        // and an obligation note to the borrower that gives them the
        // right to pay back the loan and get the collateral back.
        ILoanManager loanCoordinator = ILoanManager(hub.getContract(LOAN_COORDINATOR));
        loanId = loanCoordinator.registerLoan(_lender, _loanType);

        // Add the loan to storage before moving collateral/principal to follow
        // the Checks-Effects-Interactions pattern.
        loanIdToLoan[loanId] = _loanTerms;
        loanIdToLoanExtras[loanId] = _loanExtras;

        return loanId;
    }

    function _transferNFT(
        LoanTerms memory _loanTerms,
        address _sender,
        address _recipient
    ) internal {
        Address.functionDelegateCall(
            _loanTerms.nftCollateralWrapper,
            abi.encodeWithSelector(
                INftWrapper(_loanTerms.nftCollateralWrapper).transferNFT.selector,
                _sender,
                _recipient,
                _loanTerms.nftCollateralContract,
                _loanTerms.nftCollateralId
            ),
            "NFT not successfully transferred"
        );
    }

    function _payBackLoan(
        uint32 _loanId,
        address _borrower,
        address _lender,
        LoanTerms memory _loan
    ) internal {
        // Fetch loan details from storage, but store them in memory for the sake of saving gas.
        LoanExtras memory loanExtras = loanIdToLoanExtras[_loanId];

        (uint256 adminFee, uint256 payoffAmount) = _payoffAndFee(_loan);

        // Transfer principal-plus-interest-minus-fees from the caller to lender
        IERC20(_loan.loanERC20Denomination).safeTransferFrom(msg.sender, _lender, payoffAmount);

        uint256 revenueShare = LoanComputations.getRevenueShare(
            adminFee,
            loanExtras.revenueShareInBasisPoints
        );
        // AllowedPartners contract doesn't allow to set a revenueShareInBasisPoints for address zero so revenuShare
        // > 0 implies that revenueSharePartner ~= address(0), BUT revenueShare can be zero for a partener when the
        // adminFee is low
        if (revenueShare > 0 && loanExtras.revenueSharePartner != address(0)) {
            adminFee -= revenueShare;
            // Transfer revenue share from the caller to permitted partner
            IERC20(_loan.loanERC20Denomination).safeTransferFrom(
                msg.sender,
                loanExtras.revenueSharePartner,
                revenueShare
            );
        }
        // Transfer fees from the caller to admins
        IERC20(_loan.loanERC20Denomination).safeTransferFrom(msg.sender, owner(), adminFee);

        // Emit an event with all relevant details from this transaction.
        emit LoanRepaid(
            _loanId,
            _borrower,
            _lender,
            _loan.loanPrincipalAmount,
            _loan.nftCollateralId,
            payoffAmount,
            adminFee,
            revenueShare,
            loanExtras.revenueSharePartner, // this could be a non address zero even if revenueShare is 0
            _loan.nftCollateralContract,
            _loan.loanERC20Denomination
        );
    }

    function _resolveLoan(
        uint32 _loanId,
        address _nftAcceptor,
        LoanTerms memory _loanTerms,
        ILoanManager _loanCoordinator
    ) internal {
        _resolveLoanNoNftTransfer(_loanId, _loanTerms, _loanCoordinator);
        // Transfer collateral from this contract to the lender, since the lender is seizing collateral for an overdue
        // loan
        _transferNFT(_loanTerms, address(this), _nftAcceptor);
    }

    function _resolveLoanNoNftTransfer(
        uint32 _loanId,
        LoanTerms memory _loanTerms,
        ILoanManager _loanCoordinator
    ) internal {
        // Mark loan as liquidated before doing any external transfers to follow the Checks-Effects-Interactions design
        // pattern
        loanRepaidOrLiquidated[_loanId] = true;

        _escrowTokens[_loanTerms.nftCollateralContract][_loanTerms.nftCollateralId] -= 1;

        // Destroy the lender's promissory note for this loan and borrower obligation receipt
        _loanCoordinator.resolveLoan(_loanId);
    }

    function _setERC20Permit(address _erc20, bool _permit) internal {
        require(_erc20 != address(0), "erc20 is zero address");

        erc20Permits[_erc20] = _permit;

        emit ERC20Permit(_erc20, _permit);
    }

    function _loanSanityChecks(LoanStructures.Offer memory _offer, address _nftWrapper) internal view {
        require(isERC20Permitted(_offer.loanERC20Denomination), "Currency denomination is not permitted");
        require(_nftWrapper != address(0), "NFT collateral contract is not permitted");
        require(uint256(_offer.loanDuration) <= maximumLoanDuration, "Loan duration exceeds maximum loan duration");
        require(uint256(_offer.loanDuration) != 0, "Loan duration cannot be zero");
        require(
            _offer.loanAdminFeeInBasisPoints == adminFeeInBasisPoints,
            "The admin fee has changed since this order was signed."
        );
    }

    function _getLoanData(uint32 _loanId)
        internal
        view
        returns (
            address borrower,
            address lender,
            LoanTerms memory loan,
            ILoanManager loanCoordinator
        )
    {
        loanCoordinator = ILoanManager(hub.getContract(LOAN_COORDINATOR));
        ILoanManager.Loan memory loanCoordinatorData = loanCoordinator.getLoanData(_loanId);
        uint256 notesNftId = loanCoordinatorData.notesNftId;
        // Fetch loan details from storage, but store them in memory for the sake of saving gas.
        loan = loanIdToLoan[_loanId];
        if (loan.borrower != address(0)) {
            borrower = loan.borrower;
        } else {
            // Fetch current owner of loan obligation note.
            borrower = IERC721(loanCoordinator.obligationReceiptToken()).ownerOf(notesNftId);
        }
        lender = IERC721(loanCoordinator.promissoryNoteToken()).ownerOf(notesNftId);
    }

    function _setupLoanExtras(address _revenueSharePartner, uint16 _referralFeeInBasisPoints)
        internal
        view
        returns (LoanExtras memory)
    {
        // Save loan details to a struct in memory first, to save on gas if any
        // of the below checks fail, and to avoid the "Stack Too Deep" error by
        // clumping the parameters together into one struct held in memory.
        return
            LoanExtras({
                revenueSharePartner: _revenueSharePartner,
                revenueShareInBasisPoints: LoanComputations.getRevenueSharePercent(_revenueSharePartner, hub),
                referralFeeInBasisPoints: _referralFeeInBasisPoints
            });
    }

    function _payoffAndFee(LoanTerms memory _loanTerms) internal view virtual returns (uint256, uint256);

    function _getWrapper(address _nftCollateralContract) internal view returns (address) {
        return IAllowedNFTs(hub.getContract(KeysMapping.PERMITTED_NFTS)).getNFTWrapper(_nftCollateralContract);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

library KeysMapping {
    bytes32 public constant PERMITTED_ERC20S = bytes32("PERMITTED_ERC20S");
    bytes32 public constant PERMITTED_NFTS = bytes32("PERMITTED_NFTS");
    bytes32 public constant PERMITTED_PARTNERS = bytes32("PERMITTED_PARTNERS");
    bytes32 public constant NFT_TYPE_REGISTRY = bytes32("NFT_TYPE_REGISTRY");
    bytes32 public constant LOAN_REGISTRY = bytes32("LOAN_REGISTRY");
    bytes32 public constant PERMITTED_SNFT_RECEIVER = bytes32("PERMITTED_SNFT_RECEIVER");
    bytes32 public constant PERMITTED_BUNDLE_ERC20S = bytes32("PERMITTED_BUNDLE_ERC20S");
    bytes32 public constant PERMITTED_AIRDROPS = bytes32("PERMITTED_AIRDROPS");
    bytes32 public constant AIRDROP_RECEIVER = bytes32("AIRDROP_RECEIVER");
    bytes32 public constant AIRDROP_FACTORY = bytes32("AIRDROP_FACTORY");
    bytes32 public constant AIRDROP_FLASH_LOAN = bytes32("AIRDROP_FLASH_LOAN");
    bytes32 public constant LIQUIDOTS_BUNDLER = bytes32("LIQUIDOTS_BUNDLER");

    string public constant AIRDROP_WRAPPER_STRING = "AirdropWrapper";

    function keyToId(string memory _key) external pure returns (bytes32 id) {
        require(bytes(_key).length <= 32, "invalid key");

        // solhint-disable-next-line no-inline-assembly
        assembly {
            id := mload(add(_key, 32))
        }
    }
}

// SPDX-License-Identifier: MIT

import "./LoanStructures.sol";

pragma solidity 0.8.4;

interface ILoanCommon {
    function maximumLoanDuration() external view returns (uint256);

    function adminFeeInBasisPoints() external view returns (uint16);

    // solhint-disable-next-line func-name-mixedcase
    function LOAN_COORDINATOR() external view returns (bytes32);

    function loanIdToLoan(uint32)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            address,
            uint32,
            uint16,
            uint16,
            address,
            uint64,
            address,
            address
        );

    function loanRepaidOrLiquidated(uint32) external view returns (bool);

    function hasNonceBeenUsedForUser(address _user, uint256 _nonce) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface LoanStructures {
    struct LoanTerms {
        uint256 loanPrincipalAmount;
        uint256 maximumRepaymentAmount;
        uint256 nftCollateralId;
        address loanERC20Denomination;
        uint32 loanDuration;
        uint16 loanInterestRateForDurationInBasisPoints;
        uint16 loanAdminFeeInBasisPoints;
        address nftCollateralWrapper;
        uint64 loanStartTime;
        address nftCollateralContract;
        address borrower;
    }

    struct LoanExtras {
        address revenueSharePartner;
        uint16 revenueShareInBasisPoints;
        uint16 referralFeeInBasisPoints;
    }

    struct Offer {
        uint256 loanPrincipalAmount;
        uint256 maximumRepaymentAmount;
        uint256 nftCollateralId;
        address nftCollateralContract;
        uint32 loanDuration;
        uint16 loanAdminFeeInBasisPoints;
        address loanERC20Denomination;
        address referrer;
    }

    struct Signature {
        uint256 nonce;
        uint256 expiry;
        address signer;
        bytes signature;
    }

    struct BorrowerSettings {
        address revenueSharePartner;
        uint16 referralFeeInBasisPoints;
    }

    struct ListingTerms {
        uint256 minLoanPrincipalAmount;
        uint256 maxLoanPrincipalAmount;
        uint256 nftCollateralId;
        address nftCollateralContract;
        uint32 minLoanDuration;
        uint32 maxLoanDuration;
        uint16 maxInterestRateForDurationInBasisPoints;
        uint16 referralFeeInBasisPoints;
        address revenueSharePartner;
        address loanERC20Denomination;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "./ILoanCommon.sol";
import "./LoanStructures.sol";
import "../../interfaces/ILoanManager.sol";
import "../../utils/KeysMapping.sol";
import "../../interfaces/IDispatcher.sol";
import "../../interfaces/IAllowedPartners.sol";
import "../../interfaces/IAllowedERC20s.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

library LoanComputations {
    uint16 private constant HUNDRED_PERCENT = 10000;

    function validatePayback(uint32 _loanId, IDispatcher _hub) external view {
        checkLoanIdValidity(_loanId, _hub);
        // Sanity check that payBackLoan() and liquidateExpiredLoan() have never been called on this loanId.
        // Depending on how the rest of the code turns out, this check may be unnecessary.
        require(!ILoanCommon(address(this)).loanRepaidOrLiquidated(_loanId), "Loan already repaid/liquidated");

        // Fetch loan details from storage, but store them in memory for the sake of saving gas.
        (, , , , uint32 loanDuration, , , , uint64 loanStartTime, , ) = ILoanCommon(address(this)).loanIdToLoan(
            _loanId
        );

        // When a loan exceeds the loan term, it is expired. At this stage the Lender can call Liquidate Loan to resolve
        // the loan.
        require(block.timestamp <= (uint256(loanStartTime) + uint256(loanDuration)), "Loan is expired");
    }

    function checkLoanIdValidity(uint32 _loanId, IDispatcher _hub) public view {
        require(
            ILoanManager(_hub.getContract(ILoanCommon(address(this)).LOAN_COORDINATOR())).isValidLoanId(
                _loanId,
                address(this)
            ),
            "invalid loanId"
        );
    }

    function getRevenueSharePercent(address _revenueSharePartner, IDispatcher _hub) external view returns (uint16) {
        // return soon if no partner is set to avoid a public call
        if (_revenueSharePartner == address(0)) {
            return 0;
        }

        uint16 revenueSharePercent = IAllowedPartners(_hub.getContract(KeysMapping.PERMITTED_PARTNERS))
        .getPartnerPermit(_revenueSharePartner);

        return revenueSharePercent;
    }

    function validateRenegotiation(
        LoanStructures.LoanTerms memory _loan,
        uint32 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _lenderNonce,
        IDispatcher _hub
    ) external view returns (address, address) {
        checkLoanIdValidity(_loanId, _hub);
        ILoanManager loanCoordinator = ILoanManager(
            _hub.getContract(ILoanCommon(address(this)).LOAN_COORDINATOR())
        );
        uint256 notesNftId = loanCoordinator.getLoanData(_loanId).notesNftId;

        address borrower;

        if (_loan.borrower != address(0)) {
            borrower = _loan.borrower;
        } else {
            borrower = IERC721(loanCoordinator.obligationReceiptToken()).ownerOf(notesNftId);
        }

        require(msg.sender == borrower, "Only borrower can initiate");
        require(block.timestamp <= (uint256(_loan.loanStartTime) + _newLoanDuration), "New duration already expired");
        require(
            uint256(_newLoanDuration) <= ILoanCommon(address(this)).maximumLoanDuration(),
            "New duration exceeds maximum loan duration"
        );
        require(!ILoanCommon(address(this)).loanRepaidOrLiquidated(_loanId), "Loan already repaid/liquidated");
        require(
            _newMaximumRepaymentAmount >= _loan.loanPrincipalAmount,
            "Negative interest rate loans are not allowed."
        );

        // Fetch current owner of loan promissory note.
        address lender = IERC721(loanCoordinator.promissoryNoteToken()).ownerOf(notesNftId);

        require(
            !ILoanCommon(address(this)).hasNonceBeenUsedForUser(lender, _lenderNonce),
            "Lender nonce invalid"
        );

        return (borrower, lender);
    }

    function bindingTermsSanityChecks(LoanStructures.ListingTerms memory _listingTerms, LoanStructures.Offer memory _offer)
        external
        pure
    {
        // offer vs listing validations
        require(_offer.loanERC20Denomination == _listingTerms.loanERC20Denomination, "Invalid loanERC20Denomination");
        require(
            _offer.loanPrincipalAmount >= _listingTerms.minLoanPrincipalAmount &&
                _offer.loanPrincipalAmount <= _listingTerms.maxLoanPrincipalAmount,
            "Invalid loanPrincipalAmount"
        );
        uint256 maxRepaymentLimit = _offer.loanPrincipalAmount +
            (_offer.loanPrincipalAmount * _listingTerms.maxInterestRateForDurationInBasisPoints) /
            HUNDRED_PERCENT;
        require(_offer.maximumRepaymentAmount <= maxRepaymentLimit, "maxInterestRateForDurationInBasisPoints violated");

        require(
            _offer.loanDuration >= _listingTerms.minLoanDuration &&
                _offer.loanDuration <= _listingTerms.maxLoanDuration,
            "Invalid loanDuration"
        );
    }

    function getRevenueShare(uint256 _adminFee, uint256 _revenueShareInBasisPoints)
        external
        pure
        returns (uint256)
    {
        return (_adminFee * _revenueShareInBasisPoints) / HUNDRED_PERCENT;
    }

    function getAdminFee(uint256 _interestDue, uint256 _adminFeeInBasisPoints) external pure returns (uint256) {
        return (_interestDue * _adminFeeInBasisPoints) / HUNDRED_PERCENT;
    }

    function getReferralFee(
        uint256 _loanPrincipalAmount,
        uint256 _referralFeeInBasisPoints,
        address _referrer
    ) external pure returns (uint256) {
        if (_referralFeeInBasisPoints == 0 || _referrer == address(0)) {
            return 0;
        }
        return (_loanPrincipalAmount * _referralFeeInBasisPoints) / HUNDRED_PERCENT;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "./ILoanCommon.sol";
import "./LoanStructures.sol";
import "../../interfaces/ILoanManager.sol";
import "../../utils/KeysMapping.sol";
import "../../interfaces/IDispatcher.sol";
import "../../interfaces/IAllowedPartners.sol";
import "../../interfaces/IAllowedERC20s.sol";
import "../../interfaces/IAirdropBurstLoan.sol";
import "../../interfaces/INftWrapper.sol";
import "../../airdrop/IAirdropAcceptorFactory.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/utils/Address.sol";

library LoanAirdropHelper {
    event AirdropPulledBurstloan(
        uint256 indexed loanId,
        address indexed borrower,
        uint256 nftCollateralId,
        address nftCollateralContract,
        address target,
        bytes data
    );

    event CollateralWrapped(
        uint256 indexed loanId,
        address indexed borrower,
        uint256 nftCollateralId,
        address nftCollateralContract,
        uint256 receiverId,
        address receiverInstance
    );

    function pullAirdrop(
        uint32 _loanId,
        LoanStructures.LoanTerms memory _loan,
        address _target,
        bytes calldata _data,
        address _nftAirdrop,
        uint256 _nftAirdropId,
        bool _is1155,
        uint256 _nftAirdropAmount,
        IDispatcher _hub
    ) external {
        ILoanManager loanCoordinator = ILoanManager(
            _hub.getContract(ILoanCommon(address(this)).LOAN_COORDINATOR())
        );

        address borrower;

        // scoped to aviod stack too deep
        {
            ILoanManager.Loan memory loanCoordinatorData = loanCoordinator.getLoanData(_loanId);
            uint256 notesNftId = loanCoordinatorData.notesNftId;
            if (_loan.borrower != address(0)) {
                borrower = _loan.borrower;
            } else {
                borrower = IERC721(loanCoordinator.obligationReceiptToken()).ownerOf(notesNftId);
            }
        }

        require(msg.sender == borrower, "Only borrower can airdrop");

        {
            IAirdropBurstLoan airdropBurstLoan = IAirdropBurstLoan(_hub.getContract(KeysMapping.AIRDROP_FLASH_LOAN));

            _transferNFT(_loan, address(this), address(airdropBurstLoan));

            airdropBurstLoan.pullAirdrop(
                _loan.nftCollateralContract,
                _loan.nftCollateralId,
                _loan.nftCollateralWrapper,
                _target,
                _data,
                _nftAirdrop,
                _nftAirdropId,
                _is1155,
                _nftAirdropAmount,
                borrower
            );
        }

        // revert if the collateral hasn't been transferred back before it ends
        require(
            INftWrapper(_loan.nftCollateralWrapper).isOwner(
                address(this),
                _loan.nftCollateralContract,
                _loan.nftCollateralId
            ),
            "Collateral should be returned"
        );

        emit AirdropPulledBurstloan(
            _loanId,
            borrower,
            _loan.nftCollateralId,
            _loan.nftCollateralContract,
            _target,
            _data
        );
    }

    function wrapCollateral(
        uint32 _loanId,
        LoanStructures.LoanTerms storage _loan,
        IDispatcher _hub
    ) external returns (address instance, uint256 receiverId) {
        ILoanManager loanCoordinator = ILoanManager(
            _hub.getContract(ILoanCommon(address(this)).LOAN_COORDINATOR())
        );
        // Fetch the current lender of the promissory note corresponding to this overdue loan.
        ILoanManager.Loan memory loanCoordinatorData = loanCoordinator.getLoanData(_loanId);
        uint256 notesNftId = loanCoordinatorData.notesNftId;

        address borrower;

        if (_loan.borrower != address(0)) {
            borrower = _loan.borrower;
        } else {
            borrower = IERC721(loanCoordinator.obligationReceiptToken()).ownerOf(notesNftId);
        }

        require(msg.sender == borrower, "Only borrower can wrapp");

        IAirdropAcceptorFactory factory = IAirdropAcceptorFactory(_hub.getContract(KeysMapping.AIRDROP_FACTORY));
        (instance, receiverId) = factory.createAirdropAcceptor(address(this));

        // transfer collateral to airdrop receiver wrapper
        _transferNFTtoAirdropAcceptor(_loan, instance, borrower);

        emit CollateralWrapped(
            _loanId,
            borrower,
            _loan.nftCollateralId,
            _loan.nftCollateralContract,
            receiverId,
            instance
        );

        // set the receiver as the new collateral
        _loan.nftCollateralContract = instance;
        _loan.nftCollateralId = receiverId;
    }

    function _transferNFT(
        LoanStructures.LoanTerms memory _loan,
        address _sender,
        address _recipient
    ) internal {
        Address.functionDelegateCall(
            _loan.nftCollateralWrapper,
            abi.encodeWithSelector(
                INftWrapper(_loan.nftCollateralWrapper).transferNFT.selector,
                _sender,
                _recipient,
                _loan.nftCollateralContract,
                _loan.nftCollateralId
            ),
            "NFT not successfully transferred"
        );
    }

    function _transferNFTtoAirdropAcceptor(
        LoanStructures.LoanTerms memory _loan,
        address _airdropAcceptorInstance,
        address _airdropBeneficiary
    ) internal {
        Address.functionDelegateCall(
            _loan.nftCollateralWrapper,
            abi.encodeWithSelector(
                INftWrapper(_loan.nftCollateralWrapper).wrapAirdropAcceptor.selector,
                _airdropAcceptorInstance,
                _loan.nftCollateralContract,
                _loan.nftCollateralId,
                _airdropBeneficiary
            ),
            "NFT was not successfully migrated"
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "../utils/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

abstract contract MainLoan is Ownable, Pausable, ReentrancyGuard {
    constructor(address _admin) Ownable(_admin) {
        // solhint-disable-previous-line no-empty-blocks
    }

    function pause() external onlyOwner {
        _pause();
    }

    function unpause() external onlyOwner {
        _unpause();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";

abstract contract NftAcceptor is IERC1155Receiver, ERC721Holder {
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes calldata
    ) external virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(
        address,
        address,
        uint256[] calldata,
        uint256[] calldata,
        bytes calldata
    ) external virtual override returns (bytes4) {
        revert("ERC1155 batch not supported");
    }

    function supportsInterface(bytes4 _interfaceId) public view virtual override returns (bool) {
        return
            _interfaceId == type(IERC1155Receiver).interfaceId ||
            _interfaceId == type(IERC721Receiver).interfaceId ||
            _interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "../interfaces/IPackBuilder.sol";
import "../loans/types/LoanStructures.sol";
import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";

library SignHelper {
    function getChainID() public view returns (uint256) {
        uint256 id;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            id := chainid()
        }
        return id;
    }

    function checkBorrowerSignatureValidity(LoanStructures.ListingTerms memory _listingTerms, LoanStructures.Signature memory _signature)
        external
        view
        returns (bool)
    {
        return checkBorrowerSignatureValidity(_listingTerms, _signature, address(this));
    }

    function checkBorrowerSignatureValidity(
        LoanStructures.ListingTerms memory _listingTerms,
        LoanStructures.Signature memory _signature,
        address _loanContract
    ) public view returns (bool) {
        require(block.timestamp <= _signature.expiry, "Borrower Signature has expired");
        require(_loanContract != address(0), "Loan is zero address");
        if (_signature.signer == address(0)) {
            return false;
        } else {
            bytes32 message = keccak256(
                abi.encodePacked(
                    getPackedListing(_listingTerms),
                    getPackedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

            return
                SignatureChecker.isValidSignatureNow(
                    _signature.signer,
                    ECDSA.toEthSignedMessageHash(message),
                    _signature.signature
                );
        }
    }

    function checkBorrowerSignatureValidityBundle(
        LoanStructures.ListingTerms memory _listingTerms,
        IPackBuilder.BundleElements memory _bundleElements,
        LoanStructures.Signature memory _signature
    ) external view returns (bool) {
        return checkBorrowerSignatureValidityBundle(_listingTerms, _bundleElements, _signature, address(this));
    }

    function checkBorrowerSignatureValidityBundle(
        LoanStructures.ListingTerms memory _listingTerms,
        IPackBuilder.BundleElements memory _bundleElements,
        LoanStructures.Signature memory _signature,
        address _loanContract
    ) public view returns (bool) {
        require(block.timestamp <= _signature.expiry, "Borrower Signature has expired");
        require(_loanContract != address(0), "Loan is zero address");
        if (_signature.signer == address(0)) {
            return false;
        } else {
            bytes32 message = keccak256(
                abi.encodePacked(
                    getPackedListing(_listingTerms),
                    abi.encode(_bundleElements),
                    getPackedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

            return
                SignatureChecker.isValidSignatureNow(
                    _signature.signer,
                    ECDSA.toEthSignedMessageHash(message),
                    _signature.signature
                );
        }
    }

    function checkLenderSignatureValidity(LoanStructures.Offer memory _offer, LoanStructures.Signature memory _signature)
        external
        view
        returns (bool)
    {
        return checkLenderSignatureValidity(_offer, _signature, address(this));
    }

    function checkLenderSignatureValidity(
        LoanStructures.Offer memory _offer,
        LoanStructures.Signature memory _signature,
        address _loanContract
    ) public view returns (bool) {
        require(block.timestamp <= _signature.expiry, "Lender Signature has expired");
        require(_loanContract != address(0), "Loan is zero address");
        if (_signature.signer == address(0)) {
            return false;
        } else {
            bytes32 message = keccak256(
                abi.encodePacked(getPackedOffer(_offer), getPackedSignature(_signature), _loanContract, getChainID())
            );

            return
                SignatureChecker.isValidSignatureNow(
                    _signature.signer,
                    ECDSA.toEthSignedMessageHash(message),
                    _signature.signature
                );
        }
    }

    function checkLenderSignatureValidityBundle(
        LoanStructures.Offer memory _offer,
        IPackBuilder.BundleElements memory _bundleElements,
        LoanStructures.Signature memory _signature
    ) external view returns (bool) {
        return checkLenderSignatureValidityBundle(_offer, _bundleElements, _signature, address(this));
    }

    function checkLenderSignatureValidityBundle(
        LoanStructures.Offer memory _offer,
        IPackBuilder.BundleElements memory _bundleElements,
        LoanStructures.Signature memory _signature,
        address _loanContract
    ) public view returns (bool) {
        require(block.timestamp <= _signature.expiry, "Lender Signature has expired");
        require(_loanContract != address(0), "Loan is zero address");
        if (_signature.signer == address(0)) {
            return false;
        } else {
            bytes32 message = keccak256(
                abi.encodePacked(
                    getPackedOffer(_offer),
                    abi.encode(_bundleElements),
                    getPackedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

            return
                SignatureChecker.isValidSignatureNow(
                    _signature.signer,
                    ECDSA.toEthSignedMessageHash(message),
                    _signature.signature
                );
        }
    }

    function checkLenderRenegotiationSignatureValidity(
        uint256 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        LoanStructures.Signature memory _signature
    ) external view returns (bool) {
        return
            checkLenderRenegotiationSignatureValidity(
                _loanId,
                _newLoanDuration,
                _newMaximumRepaymentAmount,
                _renegotiationFee,
                _signature,
                address(this)
            );
    }

    function checkLenderRenegotiationSignatureValidity(
        uint256 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        LoanStructures.Signature memory _signature,
        address _loanContract
    ) public view returns (bool) {
        require(block.timestamp <= _signature.expiry, "Renegotiation Signature has expired");
        require(_loanContract != address(0), "Loan is zero address");
        if (_signature.signer == address(0)) {
            return false;
        } else {
            bytes32 message = keccak256(
                abi.encodePacked(
                    _loanId,
                    _newLoanDuration,
                    _newMaximumRepaymentAmount,
                    _renegotiationFee,
                    getPackedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

            return
                SignatureChecker.isValidSignatureNow(
                    _signature.signer,
                    ECDSA.toEthSignedMessageHash(message),
                    _signature.signature
                );
        }
    }

    function getPackedListing(LoanStructures.ListingTerms memory _listingTerms) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                _listingTerms.loanERC20Denomination,
                _listingTerms.minLoanPrincipalAmount,
                _listingTerms.maxLoanPrincipalAmount,
                _listingTerms.nftCollateralContract,
                _listingTerms.nftCollateralId,
                _listingTerms.revenueSharePartner,
                _listingTerms.minLoanDuration,
                _listingTerms.maxLoanDuration,
                _listingTerms.maxInterestRateForDurationInBasisPoints,
                _listingTerms.referralFeeInBasisPoints
            );
    }

    function getPackedOffer(LoanStructures.Offer memory _offer) internal pure returns (bytes memory) {
        return
            abi.encodePacked(
                _offer.loanERC20Denomination,
                _offer.loanPrincipalAmount,
                _offer.maximumRepaymentAmount,
                _offer.nftCollateralContract,
                _offer.nftCollateralId,
                _offer.referrer,
                _offer.loanDuration,
                _offer.loanAdminFeeInBasisPoints
            );
    }

    function getPackedSignature(LoanStructures.Signature memory _signature) internal pure returns (bytes memory) {
        return abi.encodePacked(_signature.signer, _signature.nonce, _signature.expiry);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IDispatcher {
    function setContract(string calldata _contractKey, address _contractAddress) external;

    function getContract(bytes32 _contractKey) external view returns (address);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface ILoanManager {
    enum StatusType {
        NOT_EXISTS,
        NEW,
        RESOLVED
    }

    struct Loan {
        address loanContract;
        uint64 notesNftId;
        StatusType status;
    }

    function registerLoan(address _lender, bytes32 _loanType) external returns (uint32);

    function mintObligationReceipt(uint32 _loanId, address _borrower) external;

    function resolveLoan(uint32 _loanId) external;

    function promissoryNoteToken() external view returns (address);

    function obligationReceiptToken() external view returns (address);

    function getLoanData(uint32 _loanId) external view returns (Loan memory);

    function isValidLoanId(uint32 _loanId, address _loanContract) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface INftWrapper {
    function transferNFT(
        address from,
        address to,
        address nftContract,
        uint256 tokenId
    ) external returns (bool);

    function isOwner(
        address owner,
        address nftContract,
        uint256 tokenId
    ) external view returns (bool);

    function wrapAirdropAcceptor(
        address _recipient,
        address _nftContract,
        uint256 _nftId,
        address _beneficiary
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IAllowedPartners {
    function getPartnerPermit(address _partner) external view returns (uint16);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IAllowedERC20s {
    function isERC20Permitted(address _erc20) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IAllowedNFTs {
    function setNFTPermit(address _nftContract, string memory _nftType) external;

    function getNFTPermit(address _nftContract) external view returns (bytes32);

    function getNFTWrapper(address _nftContract) external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) 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 (last updated v4.7.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/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 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
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/draft-IERC20Permit.sol";
import "../../../utils/Address.sol";

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

    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");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

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

pragma solidity 0.8.4;

interface IAirdropBurstLoan {
    function pullAirdrop(
        address _nftCollateralContract,
        uint256 _nftCollateralId,
        address _nftWrapper,
        address _target,
        bytes calldata _data,
        address _nftAirdrop,
        uint256 _nftAirdropId,
        bool _is1155,
        uint256 _nftAirdropAmount,
        address _beneficiary
    ) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IAirdropAcceptorFactory {
    function createAirdropAcceptor(address _to) external returns (address, uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

import "@openzeppelin/contracts/utils/Context.sol";

abstract contract Ownable is Context {
    address private _owner;

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

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    constructor(address _initialOwner) {
        _setOwner(_initialOwner);
    }

    function transferOwnership(address _newOwner) public virtual onlyOwner {
        require(_newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(_newOwner);
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _setOwner(address _newOwner) private {
        address oldOwner = _owner;
        _owner = _newOwner;
        emit OwnershipTransferred(oldOwner, _newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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() {
        // 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 v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev _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.
     *
     * NOTE: 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.
     *
     * NOTE: 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
// 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
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.4;

interface IPackBuilder {
    struct BundleElementERC721 {
        address tokenContract;
        uint256 id;
        bool safeTransferable;
    }

    struct BundleElementERC20 {
        address tokenContract;
        uint256 amount;
    }

    struct BundleElementERC1155 {
        address tokenContract;
        uint256[] ids;
        uint256[] amounts;
    }

    struct BundleElements {
        BundleElementERC721[] erc721s;
        BundleElementERC20[] erc20s;
        BundleElementERC1155[] erc1155s;
    }

    function createBundle(
        BundleElements memory _bundleElements,
        address _sender,
        address _receiver
    ) external returns (uint256);

    function unpackBundle(uint256 _tokenId, address _receiver) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.1) (utils/cryptography/SignatureChecker.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";
import "../Address.sol";
import "../../interfaces/IERC1271.sol";

/**
 * @dev Signature verification helper that can be used instead of `ECDSA.recover` to seamlessly support both ECDSA
 * signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets like
 * Argent and Gnosis Safe.
 *
 * _Available since v4.1._
 */
library SignatureChecker {
    /**
     * @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
     * signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECDSA.recover`.
     *
     * NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
     * change through time. It could return true at block N and false at block N+1 (or the opposite).
     */
    function isValidSignatureNow(
        address signer,
        bytes32 hash,
        bytes memory signature
    ) internal view returns (bool) {
        (address recovered, ECDSA.RecoverError error) = ECDSA.tryRecover(hash, signature);
        if (error == ECDSA.RecoverError.NoError && recovered == signer) {
            return true;
        }

        (bool success, bytes memory result) = signer.staticcall(
            abi.encodeWithSelector(IERC1271.isValidSignature.selector, hash, signature)
        );
        return (success &&
            result.length == 32 &&
            abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.3) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1271.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 *
 * _Available since v4.1._
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash      Hash of the data to be signed
     * @param signature Signature byte array associated with _data
     */
    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {
    "contracts/utils/KeysMapping.sol": {
      "KeysMapping": "0x4ddc8349CcCa17f55cDeD3E81cec21dFEEB366f9"
    },
    "contracts/loans/types/LoanAirdropHelper.sol": {
      "LoanAirdropHelper": "0x68fa3ed5f5642b7d6560de759bca7451dd5c7843"
    },
    "contracts/loans/types/LoanComputations.sol": {
      "LoanComputations": "0x4d9ad703d5f62ad82c34311ac4f7dd08fb087c68"
    },
    "contracts/utils/SignHelper.sol": {
      "SignHelper": "0xd8286584cb2cb4bbd600149b9e5c8a5e3b691464"
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_admin","type":"address"},{"internalType":"address","name":"_dispatcher","type":"address"},{"internalType":"address[]","name":"_allowedERC20s","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint16","name":"newAdminFee","type":"uint16"}],"name":"AdminFeeUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"erc20Contract","type":"address"},{"indexed":false,"internalType":"bool","name":"isPermitted","type":"bool"}],"name":"ERC20Permit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"loanId","type":"uint32"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":true,"internalType":"address","name":"lender","type":"address"},{"indexed":false,"internalType":"uint256","name":"loanPrincipalAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"loanMaturityDate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"loanLiquidationDate","type":"uint256"},{"indexed":false,"internalType":"address","name":"nftCollateralContract","type":"address"}],"name":"LoanLiquidated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"loanId","type":"uint32"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":true,"internalType":"address","name":"lender","type":"address"},{"indexed":false,"internalType":"uint32","name":"newLoanDuration","type":"uint32"},{"indexed":false,"internalType":"uint256","name":"newMaximumRepaymentAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"renegotiationFee","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"renegotiationAdminFee","type":"uint256"}],"name":"LoanRenegotiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"loanId","type":"uint32"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":true,"internalType":"address","name":"lender","type":"address"},{"indexed":false,"internalType":"uint256","name":"loanPrincipalAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountPaidToLender","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"adminFee","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"revenueShare","type":"uint256"},{"indexed":false,"internalType":"address","name":"revenueSharePartner","type":"address"},{"indexed":false,"internalType":"address","name":"nftCollateralContract","type":"address"},{"indexed":false,"internalType":"address","name":"loanERC20Denomination","type":"address"}],"name":"LoanRepaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint32","name":"loanId","type":"uint32"},{"indexed":true,"internalType":"address","name":"borrower","type":"address"},{"indexed":true,"internalType":"address","name":"lender","type":"address"},{"components":[{"internalType":"uint256","name":"loanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maximumRepaymentAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"loanERC20Denomination","type":"address"},{"internalType":"uint32","name":"loanDuration","type":"uint32"},{"internalType":"uint16","name":"loanInterestRateForDurationInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"loanAdminFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"nftCollateralWrapper","type":"address"},{"internalType":"uint64","name":"loanStartTime","type":"uint64"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"address","name":"borrower","type":"address"}],"indexed":false,"internalType":"struct LoanStructures.LoanTerms","name":"loanTerms","type":"tuple"},{"components":[{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"uint16","name":"revenueShareInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"}],"indexed":false,"internalType":"struct LoanStructures.LoanExtras","name":"loanExtras","type":"tuple"}],"name":"LoanStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"newMaximumLoanDuration","type":"uint256"}],"name":"MaximumLoanDurationUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"HUNDRED_PERCENT","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LOAN_COORDINATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"LOAN_TYPE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"loanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maximumRepaymentAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"uint32","name":"loanDuration","type":"uint32"},{"internalType":"uint16","name":"loanAdminFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"loanERC20Denomination","type":"address"},{"internalType":"address","name":"referrer","type":"address"}],"internalType":"struct LoanStructures.Offer","name":"_offer","type":"tuple"},{"components":[{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"address","name":"signer","type":"address"},{"internalType":"bytes","name":"signature","type":"bytes"}],"internalType":"struct LoanStructures.Signature","name":"_signature","type":"tuple"},{"components":[{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"}],"internalType":"struct LoanStructures.BorrowerSettings","name":"_borrowerSettings","type":"tuple"}],"name":"acceptOffer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"adminFeeInBasisPoints","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_nonce","type":"uint256"}],"name":"cancelNonceForUser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"}],"name":"computePayoffAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"uint256","name":"_nonce","type":"uint256"}],"name":"hasNonceBeenUsedForUser","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"hub","outputs":[{"internalType":"contract IDispatcher","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_erc20","type":"address"}],"name":"isERC20Permitted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"}],"name":"liquidateExpiredLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"","type":"uint32"}],"name":"loanIdToLoan","outputs":[{"internalType":"uint256","name":"loanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maximumRepaymentAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"loanERC20Denomination","type":"address"},{"internalType":"uint32","name":"loanDuration","type":"uint32"},{"internalType":"uint16","name":"loanInterestRateForDurationInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"loanAdminFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"nftCollateralWrapper","type":"address"},{"internalType":"uint64","name":"loanStartTime","type":"uint64"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"address","name":"borrower","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"","type":"uint32"}],"name":"loanIdToLoanExtras","outputs":[{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"uint16","name":"revenueShareInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"","type":"uint32"}],"name":"loanRepaidOrLiquidated","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maximumLoanDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"}],"name":"mintObligationReceipt","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC721Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"}],"name":"payBackLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"pipeERC1155Airdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"pipeERC20Airdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"}],"name":"pipeERC721Airdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"},{"internalType":"address","name":"_target","type":"address"},{"internalType":"bytes","name":"_data","type":"bytes"},{"internalType":"address","name":"_nftAirdrop","type":"address"},{"internalType":"uint256","name":"_nftAirdropId","type":"uint256"},{"internalType":"bool","name":"_is1155","type":"bool"},{"internalType":"uint256","name":"_nftAirdropAmount","type":"uint256"}],"name":"pullAirdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"},{"internalType":"uint32","name":"_newLoanDuration","type":"uint32"},{"internalType":"uint256","name":"_newMaximumRepaymentAmount","type":"uint256"},{"internalType":"uint256","name":"_renegotiationFee","type":"uint256"},{"internalType":"uint256","name":"_lenderNonce","type":"uint256"},{"internalType":"uint256","name":"_expiry","type":"uint256"},{"internalType":"bytes","name":"_lenderSignature","type":"bytes"}],"name":"renegotiateLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_erc20","type":"address"},{"internalType":"bool","name":"_permit","type":"bool"}],"name":"setERC20Permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_erc20s","type":"address[]"},{"internalType":"bool[]","name":"_permits","type":"bool[]"}],"name":"setERC20Permits","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"_interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"_newAdminFeeInBasisPoints","type":"uint16"}],"name":"updateAdminFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaximumLoanDuration","type":"uint256"}],"name":"updateMaximumLoanDuration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_loanId","type":"uint32"}],"name":"wrapCollateral","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000007f601c53cb2209b8e204989b01bf2f87a963b6b2000000000000000000000000196413c347ec43aea4719a83ec14db7b42dc832d00000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _admin (address): 0x7F601C53cb2209b8E204989B01Bf2f87A963b6b2
Arg [1] : _dispatcher (address): 0x196413C347Ec43aEa4719a83Ec14DB7B42dc832D

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000007f601c53cb2209b8e204989b01bf2f87a963b6b2
Arg [1] : 000000000000000000000000196413c347ec43aea4719a83ec14db7b42dc832d
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000