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// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.4;

import "../interfaces/IBundleBuilder.sol";
import "../loans/direct/loanTypes/LoanData.sol";
import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";

/**
 * @title  NFTfiSigningUtils
 * @author NFTfi
 * @notice Helper contract for NFTfi. This contract manages verifying signatures from off-chain NFTfi orders.
 * Based on the version of this same contract used on NFTfi V1
 */
library NFTfiSigningUtils {
    /* ********* */
    /* FUNCTIONS */
    /* ********* */

    /**
     * @dev This function gets the current chain ID.
     */
    function getChainID() public view returns (uint256) {
        uint256 id;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            id := chainid()
        }
        return id;
    }

    /**
     * @notice This function is when the lender accepts a borrower's binding listing terms, to validate the lender's
     * signature that the borrower provided off-chain to verify that it did indeed made such listing.
     *
     * @param _listingTerms - The listing terms struct containing:
     * - loanERC20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * - minLoanPrincipalAmount: The minumum sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maxLoanPrincipalAmount: The  sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
     * - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * - revenueSharePartner: The address of the partner that will receive the revenue share.
     * - minLoanDuration: The minumum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * - maxLoanDuration: The maximum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * - maxInterestRateForDurationInBasisPoints: This is maximum the interest rate (measured in basis points, e.g.
     * hundreths of a percent) for the loan, that must be repaid pro-rata by the borrower at the conclusion of the loan
     * or risk seizure of their nft collateral. Note if the type of the loan is fixed then this value  is not used and
     * is irrelevant so it should be set to 0.
     * - referralFeeInBasisPoints: The percent (measured in basis points) of the loan principal amount that will be
     * taken as a fee to pay to the referrer, 0 if the lender is not paying referral fee.
     * @param _signature - The offer struct containing:
     * - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     *   - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     *   - Second, it allows a user to cancel an off-chain order by calling
     * NFTfi.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
     * using the user's off-chain order that contains that nonce.
     * - expiry: Date when the signature expires
     * - signature: The ECDSA signature of the borrower, obtained off-chain ahead of time, signing the following
     * combination of parameters:
     *   - listingTerms.loanERC20Denomination,
     *   - listingTerms.minLoanPrincipalAmount,
     *   - listingTerms.maxLoanPrincipalAmount,
     *   - listingTerms.nftCollateralContract,
     *   - listingTerms.nftCollateralId,
     *   - listingTerms.revenueSharePartner,
     *   - listingTerms.minLoanDuration,
     *   - listingTerms.maxLoanDuration,
     *   - listingTerms.maxInterestRateForDurationInBasisPoints,
     *   - listingTerms.referralFeeInBasisPoints,
     *   - signature.signer,
     *   - signature.nonce,
     *   - signature.expiry,
     *   - address of this contract
     *   - chainId
     */
    function isValidBorrowerSignature(LoanData.ListingTerms memory _listingTerms, LoanData.Signature memory _signature)
        external
        view
        returns (bool)
    {
        return isValidBorrowerSignature(_listingTerms, _signature, address(this));
    }

    /**
     * @dev This function overload the previous function to allow the caller to specify the address of the contract
     *
     */
    function isValidBorrowerSignature(
        LoanData.ListingTerms memory _listingTerms,
        LoanData.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(
                    getEncodedListing(_listingTerms),
                    getEncodedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

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

    /**
     * @notice This function is when the lender accepts a borrower's binding listing terms, to validate the lender's
     * signature that the borrower provided off-chain to verify that it did indeed made such listing.
     *
     * @param _listingTerms - The listing terms struct containing:
     * - loanERC20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * - minLoanPrincipalAmount: The minumum sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maxLoanPrincipalAmount: The  sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
     * - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * - revenueSharePartner: The address of the partner that will receive the revenue share.
     * - minLoanDuration: The minumum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * - maxLoanDuration: The maximum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * - maxInterestRateForDurationInBasisPoints: This is maximum the interest rate (measured in basis points, e.g.
     * hundreths of a percent) for the loan, that must be repaid pro-rata by the borrower at the conclusion of the loan
     * or risk seizure of their nft collateral. Note if the type of the loan is fixed then this value  is not used and
     * is irrelevant so it should be set to 0.
     * - referralFeeInBasisPoints: The percent (measured in basis points) of the loan principal amount that will be
     * taken as a fee to pay to the referrer, 0 if the lender is not paying referral fee.
     * @param _bundleElements - the lists of erc721-20-1155 tokens that are to be bundled
     * @param _signature - The offer struct containing:
     * - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     *   - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     *   - Second, it allows a user to cancel an off-chain order by calling
     * NFTfi.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
     * using the user's off-chain order that contains that nonce.
     * - expiry: Date when the signature expires
     * - signature: The ECDSA signature of the borrower, obtained off-chain ahead of time, signing the following
     * combination of parameters:
     *   - listingTerms.loanERC20Denomination,
     *   - listingTerms.minLoanPrincipalAmount,
     *   - listingTerms.maxLoanPrincipalAmount,
     *   - listingTerms.nftCollateralContract,
     *   - listingTerms.nftCollateralId,
     *   - listingTerms.revenueSharePartner,
     *   - listingTerms.minLoanDuration,
     *   - listingTerms.maxLoanDuration,
     *   - listingTerms.maxInterestRateForDurationInBasisPoints,
     *   - listingTerms.referralFeeInBasisPoints,
     *   - bundleElements
     *   - signature.signer,
     *   - signature.nonce,
     *   - signature.expiry,
     *   - address of this contract
     *   - chainId
     */
    function isValidBorrowerSignatureBundle(
        LoanData.ListingTerms memory _listingTerms,
        IBundleBuilder.BundleElements memory _bundleElements,
        LoanData.Signature memory _signature
    ) external view returns (bool) {
        return isValidBorrowerSignatureBundle(_listingTerms, _bundleElements, _signature, address(this));
    }

    /**
     * @dev This function overload the previous function to allow the caller to specify the address of the contract
     *
     */
    function isValidBorrowerSignatureBundle(
        LoanData.ListingTerms memory _listingTerms,
        IBundleBuilder.BundleElements memory _bundleElements,
        LoanData.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(
                    getEncodedListing(_listingTerms),
                    abi.encode(_bundleElements),
                    getEncodedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

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

    /**
     * @notice This function is when the borrower accepts a lender's offer, to validate the lender's signature that the
     * lender provided off-chain to verify that it did indeed made such offer.
     *
     * @param _offer - The offer struct containing:
     * - loanERC20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * - loanPrincipalAmount: The original sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
     * - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
     * this there is no referrer.
     * - loanDuration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
     * loan and seize the underlying collateral NFT.
     * - loanInterestRateForDurationInBasisPoints: This is the interest rate (measured in basis points, e.g.
     * hundreths of a percent) for the loan, that must be repaid pro-rata by the borrower at the conclusion of the loan
     * or risk seizure of their nft collateral. Note if the type of the loan is fixed then this value  is not used and
     * is irrelevant so it should be set to 0.
     * - loanAdminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
     * taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
     * attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
     * earned.
     * @param _signature - The signature structure containing:
     * - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     *   - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     *   - Second, it allows a user to cancel an off-chain order by calling
     * NFTfi.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
     * using the user's off-chain order that contains that nonce.
     * - expiry: Date when the signature expires
     * - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
     * combination of parameters:
     *   - offer.loanERC20Denomination
     *   - offer.loanPrincipalAmount
     *   - offer.maximumRepaymentAmount
     *   - offer.nftCollateralContract
     *   - offer.nftCollateralId
     *   - offer.referrer
     *   - offer.loanDuration
     *   - offer.loanAdminFeeInBasisPoints
     *   - signature.signer,
     *   - signature.nonce,
     *   - signature.expiry,
     *   - address of this contract
     *   - chainId
     */
    function isValidLenderSignature(LoanData.Offer memory _offer, LoanData.Signature memory _signature)
        external
        view
        returns (bool)
    {
        return isValidLenderSignature(_offer, _signature, address(this));
    }

    /**
     * @dev This function overload the previous function to allow the caller to specify the address of the contract
     *
     */
    function isValidLenderSignature(
        LoanData.Offer memory _offer,
        LoanData.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(getEncodedOffer(_offer), getEncodedSignature(_signature), _loanContract, getChainID())
            );

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

    /**
     * @notice This function is when the borrower accepts a lender's offer, to validate the lender's signature that the
     * lender provided off-chain to verify that it did indeed made such offer.
     *
     * @param _offer - The offer struct containing:
     * - loanERC20Denomination: The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * - loanPrincipalAmount: The original sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * - maximumRepaymentAmount: The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * - nftCollateralContract: The address of the ERC721 contract of the NFT collateral.
     * - nftCollateralId: The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * - referrer: The address of the referrer who found the lender matching the listing, Zero address to signal
     * this there is no referrer.
     * - loanDuration: The amount of time (measured in seconds) that can elapse before the lender can liquidate the
     * loan and seize the underlying collateral NFT.
     * - loanInterestRateForDurationInBasisPoints: This is the interest rate (measured in basis points, e.g.
     * hundreths of a percent) for the loan, that must be repaid pro-rata by the borrower at the conclusion of the loan
     * or risk seizure of their nft collateral. Note if the type of the loan is fixed then this value  is not used and
     * is irrelevant so it should be set to 0.
     * - loanAdminFeeInBasisPoints: The percent (measured in basis points) of the interest earned that will be
     * taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
     * attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
     * earned.
     * @param _bundleElements - the lists of erc721-20-1155 tokens that are to be bundled
     * @param _signature - The signature structure containing:
     * - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     *   - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     *   - Second, it allows a user to cancel an off-chain order by calling
     * NFTfi.cancelLoanCommitmentBeforeLoanHasBegun(), which marks the nonce as used and prevents any future loan from
     * using the user's off-chain order that contains that nonce.
     * - expiry: Date when the signature expires
     * - signature: The ECDSA signature of the lender, obtained off-chain ahead of time, signing the following
     * combination of parameters:
     *   - offer.loanERC20Denomination
     *   - offer.loanPrincipalAmount
     *   - offer.maximumRepaymentAmount
     *   - offer.nftCollateralContract
     *   - offer.nftCollateralId
     *   - offer.referrer
     *   - offer.loanDuration
     *   - offer.loanAdminFeeInBasisPoints
     *   - bundleElements
     *   - signature.signer,
     *   - signature.nonce,
     *   - signature.expiry,
     *   - address of this contract
     *   - chainId
     */
    function isValidLenderSignatureBundle(
        LoanData.Offer memory _offer,
        IBundleBuilder.BundleElements memory _bundleElements,
        LoanData.Signature memory _signature
    ) external view returns (bool) {
        return isValidLenderSignatureBundle(_offer, _bundleElements, _signature, address(this));
    }

    /**
     * @dev This function overload the previous function to allow the caller to specify the address of the contract
     *
     */
    function isValidLenderSignatureBundle(
        LoanData.Offer memory _offer,
        IBundleBuilder.BundleElements memory _bundleElements,
        LoanData.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(
                    getEncodedOffer(_offer),
                    abi.encode(_bundleElements),
                    getEncodedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

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

    /**
     * @notice This function is called in renegotiateLoan() to validate the lender's signature that the lender provided
     * off-chain to verify that they did indeed want to agree to this loan renegotiation according to these terms.
     *
     * @param _loanId - The unique identifier for the loan to be renegotiated
     * @param _newLoanDuration - The new amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * @param _newMaximumRepaymentAmount - The new maximum amount of money that the borrower would be required to
     * retrieve their collateral, measured in the smallest units of the ERC20 currency used for the loan. The
     * borrower will always have to pay this amount to retrieve their collateral, regardless of whether they repay
     * early.
     * @param _renegotiationFee Agreed upon fee in ether that borrower pays for the lender for the renegitiation
     * @param _signature - The signature structure containing:
     * - signer: The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * - nonce: The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     * - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     * - Second, it allows a user to cancel an off-chain order by calling NFTfi.cancelLoanCommitmentBeforeLoanHasBegun()
     * , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
     * that nonce.
     * - expiry - The date when the renegotiation offer expires
     * - lenderSignature - The ECDSA signature of the lender, obtained off-chain ahead of time, signing the
     * following combination of parameters:
     * - _loanId
     * - _newLoanDuration
     * - _newMaximumRepaymentAmount
     * - _lender
     * - _lenderNonce
     * - _expiry
     * - address of this contract
     * - chainId
     */
    function isValidLenderRenegotiationSignature(
        uint256 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        LoanData.Signature memory _signature
    ) external view returns (bool) {
        return
            isValidLenderRenegotiationSignature(
                _loanId,
                _newLoanDuration,
                _newMaximumRepaymentAmount,
                _renegotiationFee,
                _signature,
                address(this)
            );
    }

    /**
     * @dev This function overload the previous function to allow the caller to specify the address of the contract
     *
     */
    function isValidLenderRenegotiationSignature(
        uint256 _loanId,
        uint32 _newLoanDuration,
        uint256 _newMaximumRepaymentAmount,
        uint256 _renegotiationFee,
        LoanData.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,
                    getEncodedSignature(_signature),
                    _loanContract,
                    getChainID()
                )
            );

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

    /**
     * @dev We need this to avoid stack too deep errors.
     */
    function getEncodedListing(LoanData.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
            );
    }

    /**
     * @dev We need this to avoid stack too deep errors.
     */
    function getEncodedOffer(LoanData.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
            );
    }

    /**
     * @dev We need this to avoid stack too deep errors.
     */
    function getEncodedSignature(LoanData.Signature memory _signature) internal pure returns (bytes memory) {
        return abi.encodePacked(_signature.signer, _signature.nonce, _signature.expiry);
    }
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.4;

interface IBundleBuilder {
    /**
     * @notice data of a erc721 bundle element
     *
     * @param tokenContract - address of the token contract
     * @param id - id of the token
     * @param safeTransferable - wether the implementing token contract has a safeTransfer function or not
     */
    struct BundleElementERC721 {
        address tokenContract;
        uint256 id;
        bool safeTransferable;
    }

    /**
     * @notice data of a erc20 bundle element
     *
     * @param tokenContract - address of the token contract
     * @param amount - amount of the token
     */
    struct BundleElementERC20 {
        address tokenContract;
        uint256 amount;
    }

    /**
     * @notice data of a erc20 bundle element
     *
     * @param tokenContract - address of the token contract
     * @param ids - list of ids of the tokens
     * @param amounts - list amounts of the tokens
     */
    struct BundleElementERC1155 {
        address tokenContract;
        uint256[] ids;
        uint256[] amounts;
    }

    /**
     * @notice the lists of erc721-20-1155 tokens that are to be bundled
     *
     * @param erc721s list of erc721 tokens
     * @param erc20s list of erc20 tokens
     * @param erc1155s list of erc1155 tokens
     */
    struct BundleElements {
        BundleElementERC721[] erc721s;
        BundleElementERC20[] erc20s;
        BundleElementERC1155[] erc1155s;
    }

    /**
     * @notice used by the loan contract to build a bundle from the BundleElements struct at the beginning of a loan,
     * returns the id of the created bundle
     *
     * @param _bundleElements - the lists of erc721-20-1155 tokens that are to be bundled
     * @param _sender sender of the tokens in the bundle - the borrower
     * @param _receiver receiver of the created bundle, normally the loan contract
     */
    function buildBundle(
        BundleElements memory _bundleElements,
        address _sender,
        address _receiver
    ) external returns (uint256);

    /**
     * @notice Remove all the children from the bundle
     * @dev This method may run out of gas if the list of children is too big. In that case, children can be removed
     *      individually.
     * @param _tokenId the id of the bundle
     * @param _receiver address of the receiver of the children
     */
    function decomposeBundle(uint256 _tokenId, address _receiver) external;
}

// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.4;

/**
 * @title  LoanData
 * @author NFTfi
 * @notice An interface containg the main Loan struct shared by Direct Loans types.
 */
interface LoanData {
    /* ********** */
    /* DATA TYPES */
    /* ********** */

    /**
     * @notice The main Loan Terms struct. This data is saved upon loan creation.
     *
     * @param loanERC20Denomination - The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * @param loanPrincipalAmount - The original sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * @param maximumRepaymentAmount - The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * @param nftCollateralContract - The address of the the NFT collateral contract.
     * @param nftCollateralWrapper - The NFTfi wrapper of the NFT collateral contract.
     * @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * @param loanStartTime - The block.timestamp when the loan first began (measured in seconds).
     * @param loanDuration - The amount of time (measured in seconds) that can elapse before the lender can liquidate
     * the loan and seize the underlying collateral NFT.
     * @param loanInterestRateForDurationInBasisPoints - This is the interest rate (measured in basis points, e.g.
     * hundreths of a percent) for the loan, that must be repaid pro-rata by the borrower at the conclusion of the loan
     * or risk seizure of their nft collateral. Note if the type of the loan is fixed then this value  is not used and
     * is irrelevant so it should be set to 0.
     * @param loanAdminFeeInBasisPoints - The percent (measured in basis points) of the interest earned that will be
     * taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
     * attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
     * earned.
     * @param borrower
     */
    struct LoanTerms {
        uint256 loanPrincipalAmount;
        uint256 maximumRepaymentAmount;
        uint256 nftCollateralId;
        address loanERC20Denomination;
        uint32 loanDuration;
        uint16 loanInterestRateForDurationInBasisPoints;
        uint16 loanAdminFeeInBasisPoints;
        address nftCollateralWrapper;
        uint64 loanStartTime;
        address nftCollateralContract;
        address borrower;
    }

    /**
     * @notice Some extra Loan's settings struct. This data is saved upon loan creation.
     * We need this to avoid stack too deep errors.
     *
     * @param revenueSharePartner - The address of the partner that will receive the revenue share.
     * @param revenueShareInBasisPoints - The percent (measured in basis points) of the admin fee amount that will be
     * taken as a revenue share for a t
     * @param referralFeeInBasisPoints - The percent (measured in basis points) of the loan principal amount that will
     * be taken as a fee to pay to the referrer, 0 if the lender is not paying referral fee.he partner, at the moment
     * the loan is begun.
     */
    struct LoanExtras {
        address revenueSharePartner;
        uint16 revenueShareInBasisPoints;
        uint16 referralFeeInBasisPoints;
    }

    /**
     * @notice The offer made by the lender. Used as parameter on both acceptOffer (initiated by the borrower) and
     * acceptListing (initiated by the lender).
     *
     * @param loanERC20Denomination - The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * @param loanPrincipalAmount - The original sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * @param maximumRepaymentAmount - The maximum amount of money that the borrower would be required to retrieve their
     *  collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always
     * have to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * @param nftCollateralContract - The address of the ERC721 contract of the NFT collateral.
     * @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * @param referrer - The address of the referrer who found the lender matching the listing, Zero address to signal
     * this there is no referrer.
     * @param loanDuration - The amount of time (measured in seconds) that can elapse before the lender can liquidate
     * the loan and seize the underlying collateral NFT.
     * @param loanAdminFeeInBasisPoints - The percent (measured in basis points) of the interest earned that will be
     * taken as a fee by the contract admins when the loan is repaid. The fee is stored in the loan struct to prevent an
     * attack where the contract admins could adjust the fee right before a loan is repaid, and take all of the interest
     * earned.
     */
    struct Offer {
        uint256 loanPrincipalAmount;
        uint256 maximumRepaymentAmount;
        uint256 nftCollateralId;
        address nftCollateralContract;
        uint32 loanDuration;
        uint16 loanAdminFeeInBasisPoints;
        address loanERC20Denomination;
        address referrer;
    }

    /**
     * @notice Signature related params. Used as parameter on both acceptOffer (containing borrower signature) and
     * acceptListing (containing lender signature).
     *
     * @param signer - The address of the signer. The borrower for `acceptOffer` the lender for `acceptListing`.
     * @param nonce - The nonce referred here is not the same as an Ethereum account's nonce.
     * We are referring instead to a nonce that is used by the lender or the borrower when they are first signing
     * off-chain NFTfi orders. These nonce can be any uint256 value that the user has not previously used to sign an
     * off-chain order. Each nonce can be used at most once per user within NFTfi, regardless of whether they are the
     * lender or the borrower in that situation. This serves two purposes:
     * - First, it prevents replay attacks where an attacker would submit a user's off-chain order more than once.
     * - Second, it allows a user to cancel an off-chain order by calling NFTfi.cancelLoanCommitmentBeforeLoanHasBegun()
     * , which marks the nonce as used and prevents any future loan from using the user's off-chain order that contains
     * that nonce.
     * @param expiry - Date when the signature expires
     * @param signature - The ECDSA signature of the borrower or the lender, obtained off-chain ahead of time, signing
     * the following combination of parameters:
     * - Borrower
     *   - ListingTerms.loanERC20Denomination,
     *   - ListingTerms.minLoanPrincipalAmount,
     *   - ListingTerms.maxLoanPrincipalAmount,
     *   - ListingTerms.nftCollateralContract,
     *   - ListingTerms.nftCollateralId,
     *   - ListingTerms.revenueSharePartner,
     *   - ListingTerms.minLoanDuration,
     *   - ListingTerms.maxLoanDuration,
     *   - ListingTerms.maxInterestRateForDurationInBasisPoints,
     *   - ListingTerms.referralFeeInBasisPoints,
     *   - Signature.signer,
     *   - Signature.nonce,
     *   - Signature.expiry,
     *   - address of the loan type contract
     *   - chainId
     * - Lender:
     *   - Offer.loanERC20Denomination
     *   - Offer.loanPrincipalAmount
     *   - Offer.maximumRepaymentAmount
     *   - Offer.nftCollateralContract
     *   - Offer.nftCollateralId
     *   - Offer.referrer
     *   - Offer.loanDuration
     *   - Offer.loanAdminFeeInBasisPoints
     *   - Signature.signer,
     *   - Signature.nonce,
     *   - Signature.expiry,
     *   - address of the loan type contract
     *   - chainId
     */
    struct Signature {
        uint256 nonce;
        uint256 expiry;
        address signer;
        bytes signature;
    }

    /**
     * @notice Some extra parameters that the borrower needs to set when accepting an offer.
     *
     * @param revenueSharePartner - The address of the partner that will receive the revenue share.
     * @param referralFeeInBasisPoints - The percent (measured in basis points) of the loan principal amount that will
     * be taken as a fee to pay to the referrer, 0 if the lender is not paying referral fee.
     */
    struct BorrowerSettings {
        address revenueSharePartner;
        uint16 referralFeeInBasisPoints;
    }

    /**
     * @notice Terms the borrower set off-chain and is willing to accept automatically when fulfiled by a lender's
     * offer.
     *
     * @param loanERC20Denomination - The address of the ERC20 contract of the currency being used as principal/interest
     * for this loan.
     * @param minLoanPrincipalAmount - The minumum sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * @param maxLoanPrincipalAmount - The  sum of money transferred from lender to borrower at the beginning of
     * the loan, measured in loanERC20Denomination's smallest units.
     * @param maximumRepaymentAmount - The maximum amount of money that the borrower would be required to retrieve their
     * collateral, measured in the smallest units of the ERC20 currency used for the loan. The borrower will always have
     * to pay this amount to retrieve their collateral, regardless of whether they repay early.
     * @param nftCollateralContract - The address of the ERC721 contract of the NFT collateral.
     * @param nftCollateralId - The ID within the NFTCollateralContract for the NFT being used as collateral for this
     * loan. The NFT is stored within this contract during the duration of the loan.
     * @param revenueSharePartner - The address of the partner that will receive the revenue share.
     * @param minLoanDuration - The minumum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * @param maxLoanDuration - The maximum amount of time (measured in seconds) that can elapse before the lender can
     * liquidate the loan and seize the underlying collateral NFT.
     * @param maxInterestRateForDurationInBasisPoints - This is maximum the interest rate (measured in basis points,
     * e.g. hundreths of a percent) for the loan.
     * @param referralFeeInBasisPoints - The percent (measured in basis points) of the loan principal amount that will
     * be taken as a fee to pay to the referrer, 0 if the lender is not paying referral fee.
     */
    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
// OpenZeppelin Contracts (last updated v4.5.0) (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, (bytes4)) == IERC1271.isValidSignature.selector);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (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) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        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.
            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 if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } 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 (last updated v4.5.0) (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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// 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 v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

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

    /**
     * @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);
    }
}

{
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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LoanData.ListingTerms","name":"_listingTerms","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 LoanData.Signature","name":"_signature","type":"tuple"}],"name":"isValidBorrowerSignature","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"minLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maxLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"uint32","name":"minLoanDuration","type":"uint32"},{"internalType":"uint32","name":"maxLoanDuration","type":"uint32"},{"internalType":"uint16","name":"maxInterestRateForDurationInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"address","name":"loanERC20Denomination","type":"address"}],"internalType":"struct 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LoanData.Signature","name":"_signature","type":"tuple"},{"internalType":"address","name":"_loanContract","type":"address"}],"name":"isValidBorrowerSignature","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"minLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maxLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"uint32","name":"minLoanDuration","type":"uint32"},{"internalType":"uint32","name":"maxLoanDuration","type":"uint32"},{"internalType":"uint16","name":"maxInterestRateForDurationInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"address","name":"loanERC20Denomination","type":"address"}],"internalType":"struct LoanData.ListingTerms","name":"_listingTerms","type":"tuple"},{"components":[{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"bool","name":"safeTransferable","type":"bool"}],"internalType":"struct IBundleBuilder.BundleElementERC721[]","name":"erc721s","type":"tuple[]"},{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct IBundleBuilder.BundleElementERC20[]","name":"erc20s","type":"tuple[]"},{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256[]","name":"ids","type":"uint256[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"internalType":"struct IBundleBuilder.BundleElementERC1155[]","name":"erc1155s","type":"tuple[]"}],"internalType":"struct IBundleBuilder.BundleElements","name":"_bundleElements","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 LoanData.Signature","name":"_signature","type":"tuple"}],"name":"isValidBorrowerSignatureBundle","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"minLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"maxLoanPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"nftCollateralId","type":"uint256"},{"internalType":"address","name":"nftCollateralContract","type":"address"},{"internalType":"uint32","name":"minLoanDuration","type":"uint32"},{"internalType":"uint32","name":"maxLoanDuration","type":"uint32"},{"internalType":"uint16","name":"maxInterestRateForDurationInBasisPoints","type":"uint16"},{"internalType":"uint16","name":"referralFeeInBasisPoints","type":"uint16"},{"internalType":"address","name":"revenueSharePartner","type":"address"},{"internalType":"address","name":"loanERC20Denomination","type":"address"}],"internalType":"struct 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LoanData.Offer","name":"_offer","type":"tuple"},{"components":[{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"bool","name":"safeTransferable","type":"bool"}],"internalType":"struct IBundleBuilder.BundleElementERC721[]","name":"erc721s","type":"tuple[]"},{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"internalType":"struct IBundleBuilder.BundleElementERC20[]","name":"erc20s","type":"tuple[]"},{"components":[{"internalType":"address","name":"tokenContract","type":"address"},{"internalType":"uint256[]","name":"ids","type":"uint256[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"internalType":"struct IBundleBuilder.BundleElementERC1155[]","name":"erc1155s","type":"tuple[]"}],"internalType":"struct IBundleBuilder.BundleElements","name":"_bundleElements","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 LoanData.Signature","name":"_signature","type":"tuple"}],"name":"isValidLenderSignatureBundle","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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