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pragma solidity 0.8.10;

import "@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";

import "./IERC20Permit.sol";


contract AugustusRFQ is EIP712("AUGUSTUS RFQ", "1") {
    using SafeERC20 for IERC20;

    struct Order {
        uint256 nonceAndMeta; // Nonce and taker specific metadata
        uint128 expiry;
        address makerAsset;
        address takerAsset;
        address maker;
        address taker;  // zero address on orders executable by anyone
        uint256 makerAmount;
        uint256 takerAmount;
    }

    
    // makerAsset and takerAsset are Packed structures 
    // 0 - 159 bits are address
    // 160 - 161 bits are tokenType (0 ERC20, 1 ERC1155, 2 ERC721)
    struct OrderNFT {
        uint256 nonceAndMeta; // Nonce and taker specific metadata
        uint128 expiry;
        uint256 makerAsset; 
        uint256 makerAssetId; // simply ignored in case of ERC20s
        uint256 takerAsset;
        uint256 takerAssetId; // simply ignored in case of ERC20s
        address maker;
        address taker;  // zero address on orders executable by anyone
        uint256 makerAmount;
        uint256 takerAmount;
    }

    struct OrderInfo {
        Order order;
        bytes signature;
        uint256 takerTokenFillAmount;
        bytes permitTakerAsset;
        bytes permitMakerAsset;
    }

    struct OrderNFTInfo {
        OrderNFT order;
        bytes signature;
        uint256 takerTokenFillAmount;
        bytes permitTakerAsset;
        bytes permitMakerAsset;
    }


    uint256 constant public FILLED_ORDER = 1;
    uint256 constant public UNFILLED_ORDER = 0;

    // Keeps track of remaining amounts of each Order
    // 0 -> order unfilled / not exists
    // 1 -> order filled / cancelled 
    mapping(address => mapping (bytes32 => uint256)) public remaining;

    bytes32 constant public RFQ_LIMIT_ORDER_TYPEHASH = keccak256(
        "Order(uint256 nonceAndMeta,uint128 expiry,address makerAsset,address takerAsset,address maker,address taker,uint256 makerAmount,uint256 takerAmount)"
    );

    bytes32 constant public RFQ_LIMIT_NFT_ORDER_TYPEHASH = keccak256(
        "OrderNFT(uint256 nonceAndMeta,uint128 expiry,uint256 makerAsset,uint256 makerAssetId,uint256 takerAsset,uint256 takerAssetId,address maker,address taker,uint256 makerAmount,uint256 takerAmount)"
    );

    event OrderCancelled(bytes32 indexed orderHash, address indexed maker);
    event OrderFilled(
        bytes32 indexed orderHash,
        address indexed maker,
        address makerAsset,
        uint256 makerAmount,
        address indexed taker,
        address takerAsset,
        uint256 takerAmount
    );
    event OrderFilledNFT(
        bytes32 indexed orderHash,
        address indexed maker,
        uint256 makerAsset,
        uint256 makerAssetId,
        uint256 makerAmount,
        address indexed taker,
        uint256 takerAsset,
        uint256 takerAssetId,
        uint256 takerAmount
    );

    function getRemainingOrderBalance(address maker, bytes32[] calldata orderHashes) external view returns(uint256[] memory remainingBalances) {
        remainingBalances = new uint256[](orderHashes.length);
        mapping (bytes32 => uint256) storage remainingMaker = remaining[maker]; 
        for (uint i = 0; i < orderHashes.length; i++) {
            remainingBalances[i] = remainingMaker[orderHashes[i]];
        }
    }

    /**
    * @notice Cancel one or more orders using orderHashes
    * @dev Cancelled orderHashes are marked as used
    * @dev Emits a Cancel event
    * @dev Out of gas may occur in arrays of length > 400
    * @param orderHashes bytes32[] List of order hashes to cancel
    */
    function cancelOrders(bytes32[] calldata orderHashes) external {
        for (uint256 i = 0; i < orderHashes.length; i++) {
            cancelOrder(orderHashes[i]);
        }
    }

    function cancelOrder(bytes32 orderHash) public {
        if (_cancelOrder(msg.sender, orderHash)) {
            emit OrderCancelled(orderHash, msg.sender);
        }
    }

    /**  
     @dev Allows taker to partially fill an order
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
    */
    function partialFillOrder(
        Order calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount
    )
        external
        returns(uint256 makerTokenFilledAmount)
    {

        return partialFillOrderWithTarget(
            order,
            signature,
            takerTokenFillAmount,
            msg.sender
        );
        
    }

    /**  
     @dev Allows taker to partially fill an NFT order
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
    */
    function partialFillOrderNFT(
        OrderNFT calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount
    )
        external
        returns(uint256 makerTokenFilledAmount)
    {

        return partialFillOrderWithTargetNFT(
            order,
            signature,
            takerTokenFillAmount,
            msg.sender
        );
        
    }

    /**  
     @dev Same as `partialFillOrder` but it allows to specify the destination address
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
     @param target Address that will receive swap funds
    */
    function partialFillOrderWithTarget(
        Order calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount,
        address target
    )
        public
        returns(uint256 makerTokenFilledAmount)
    {
        require(takerTokenFillAmount > 0 && takerTokenFillAmount <= order.takerAmount, "Invalid Taker amount");
        makerTokenFilledAmount = (takerTokenFillAmount * order.makerAmount) / order.takerAmount;     
        require(makerTokenFilledAmount > 0, "Maker token fill amount cannot be 0");
        _fillOrder(
            order,
            signature,
            makerTokenFilledAmount,
            takerTokenFillAmount,
            target
        );

        return makerTokenFilledAmount;
    }

    /**  
     @dev Same as `partialFillOrderWithTarget` but it allows to pass permit 
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
     @param target Address that will receive swap funds
     @param permitTakerAsset Permit calldata for taker
     @param permitMakerAsset Permit calldata for maker
    */
    function partialFillOrderWithTargetPermit(
        Order calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount,
        address target,
        bytes calldata permitTakerAsset,
        bytes calldata permitMakerAsset
    )
        public
        returns(uint256 makerTokenFilledAmount)
    {
        require(takerTokenFillAmount > 0 && takerTokenFillAmount <= order.takerAmount, "Invalid Taker amount");
        makerTokenFilledAmount = (takerTokenFillAmount * order.makerAmount) / order.takerAmount;     
        require(makerTokenFilledAmount > 0, "Maker token fill amount cannot be 0");
        
        _permit(order.takerAsset, permitTakerAsset);
        _permit(order.makerAsset, permitMakerAsset);
        _fillOrder(
            order,
            signature,
            makerTokenFilledAmount,
            takerTokenFillAmount,
            target
        );

        return makerTokenFilledAmount;
        
    }

    /**  
     @dev Same as `partialFillOrderNFT` but it allows to specify the destination address
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
     @param target Address that will receive swap funds
    */
    function partialFillOrderWithTargetNFT(
        OrderNFT calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount,
        address target
    )
        public
        returns(uint256 makerTokenFilledAmount)
    {
        require(takerTokenFillAmount > 0 && takerTokenFillAmount <= order.takerAmount, "Invalid Taker amount");
        makerTokenFilledAmount = (takerTokenFillAmount * order.makerAmount) / order.takerAmount;     
        require(makerTokenFilledAmount > 0, "Maker token fill amount cannot be 0");
        _fillOrderNFT(
            order,
            signature,
            makerTokenFilledAmount,
            takerTokenFillAmount,
            target
        );

        return makerTokenFilledAmount;
    }

    /**  
     @dev Same as `partialFillOrderWithTargetNFT` but it allows to pass token permits
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param takerTokenFillAmount Maximum taker token to fill this order with.
     @param target Address that will receive swap funds
     @param permitTakerAsset Permit calldata for taker
     @param permitMakerAsset Permit calldata for maker
    */
    function partialFillOrderWithTargetPermitNFT(
        OrderNFT calldata order,
        bytes calldata signature,
        uint256 takerTokenFillAmount,
        address target,
        bytes calldata permitTakerAsset,
        bytes calldata permitMakerAsset
    )
        public
        returns(uint256 makerTokenFilledAmount)
    {
        require(takerTokenFillAmount > 0 && takerTokenFillAmount <= order.takerAmount, "Invalid Taker amount");
        makerTokenFilledAmount = (takerTokenFillAmount * order.makerAmount) / order.takerAmount;     
        require(makerTokenFilledAmount > 0, "Maker token fill amount cannot be 0");
        
        _permit(address(uint160(order.takerAsset)), permitTakerAsset);
        _permit(address(uint160(order.makerAsset)), permitMakerAsset);
        _fillOrderNFT(
            order,
            signature,
            makerTokenFilledAmount,
            takerTokenFillAmount,
            target
        );

        return makerTokenFilledAmount;
    }

    /**  
     @dev Allows taker to fill complete RFQ order
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
    */
    function fillOrder(
        Order calldata order,
        bytes calldata signature
    )
        external
    {
        fillOrderWithTarget(
            order,
            signature,
            msg.sender
        );
    }

    /**  
     @dev Allows taker to fill Limit order
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
    */
    function fillOrderNFT(
        OrderNFT calldata order,
        bytes calldata signature
    )
        external
    {
        fillOrderWithTargetNFT(
            order,
            signature,
            msg.sender
        );
    }

    /**  
     @dev Same as fillOrder but allows sender to specify the target
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param target Address of the receiver
    */
    function fillOrderWithTarget(
        Order calldata order,
        bytes calldata signature,
        address target
    )
        public
    {
        uint256 makerTokenFillAmount = order.makerAmount;
        uint256 takerTokenFillAmount = order.takerAmount;

        require(takerTokenFillAmount > 0 && makerTokenFillAmount > 0, "Invalid amount");

        _fillOrder(
            order,
            signature,
            makerTokenFillAmount,
            takerTokenFillAmount,
            target
        );
    }

    /**  
     @dev Same as fillOrderNFT but allows sender to specify the target
     @param order Order quote to fill
     @param signature Signature of the maker corresponding to the order
     @param target Address of the receiver
    */
    function fillOrderWithTargetNFT(
        OrderNFT calldata order,
        bytes calldata signature,
        address target
    )
        public
    {
        uint256 makerTokenFillAmount = order.makerAmount;
        uint256 takerTokenFillAmount = order.takerAmount;

        require(takerTokenFillAmount > 0 && makerTokenFillAmount > 0, "Invalid amount");

        _fillOrderNFT(
            order,
            signature,
            makerTokenFillAmount,
            takerTokenFillAmount,
            target
        );
    }

    /**  
     @dev Partial fill multiple orders
     @param orderInfos OrderInfo to fill
     @param target Address of receiver
    */
    function batchFillOrderWithTarget(
        OrderInfo[] calldata orderInfos,
        address target
    )
        public
    {
        for (uint256 i = 0; i < orderInfos.length; i++) {
            OrderInfo calldata orderInfo = orderInfos[i];

            uint256 takerTokenFillAmountOrder = orderInfo.takerTokenFillAmount;
            require(takerTokenFillAmountOrder > 0 && takerTokenFillAmountOrder <= orderInfo.order.takerAmount, "Invalid Taker amount");
            
            uint256 makerTokenFillAmountOrder = (takerTokenFillAmountOrder * orderInfo.order.makerAmount) / orderInfo.order.takerAmount;     
            require(makerTokenFillAmountOrder > 0, "Maker token fill amount cannot be 0");

            _permit(orderInfo.order.takerAsset, orderInfo.permitTakerAsset);
            _permit(orderInfo.order.makerAsset, orderInfo.permitMakerAsset);

            _fillOrder(
                orderInfo.order,
                orderInfo.signature,
                makerTokenFillAmountOrder,
                takerTokenFillAmountOrder,
                target
            );
        }
    }

    /**  
     @dev batch fills orders until the takerFillAmount is swapped
     @dev skip the order if it fails
     @param orderInfos OrderInfo to fill
     @param takerFillAmount total taker amount to fill
     @param target Address of receiver
    */
    function tryBatchFillOrderTakerAmount(
        OrderInfo[] calldata orderInfos,
        uint256 takerFillAmount,
        address target
    )
        public
    {
        for (uint256 i = 0; i < orderInfos.length; i++) {
            OrderInfo calldata orderInfo = orderInfos[i];
            uint256 takerFillAmountOrder = takerFillAmount > orderInfo.takerTokenFillAmount ? orderInfo.takerTokenFillAmount : takerFillAmount;

            (bool success,) = address(this).delegatecall(
                abi.encodeWithSelector(
                    this.partialFillOrderWithTargetPermit.selector,
                    orderInfo.order,
                    orderInfo.signature,
                    takerFillAmountOrder,
                    target,
                    orderInfo.permitTakerAsset,
                    orderInfo.permitMakerAsset
                )
            );

            if(success)
                takerFillAmount -= takerFillAmountOrder;
            
            if (takerFillAmount == 0)
                break;
        }
        require(takerFillAmount == 0, "Couldn't swap the requested fill amount");
    }

    /**  
     @dev batch fills orders until the makerFillAmount is swapped
     @dev skip the order if it fails
     @param orderInfos OrderInfo to fill
     @param makerFillAmount total maker amount to fill
     @param target Address of receiver
    */
    function tryBatchFillOrderMakerAmount(
        OrderInfo[] calldata orderInfos,
        uint256 makerFillAmount,
        address target
    )
        public
    {
        for (uint256 i = 0; i < orderInfos.length; i++) {
            OrderInfo calldata orderInfo = orderInfos[i];
            uint256 orderMakerAmount = orderInfo.order.makerAmount;
            uint256 orderTakerAmount = orderInfo.order.takerAmount;
            uint256 maxMakerFillAmount = (orderInfo.takerTokenFillAmount * orderMakerAmount) / orderTakerAmount; 
            uint256 makerFillAmountOrder = makerFillAmount > maxMakerFillAmount ? maxMakerFillAmount : makerFillAmount;
            uint256 takerFillAmountOrder = ((makerFillAmountOrder * orderTakerAmount) + (orderMakerAmount - 1)) / orderMakerAmount; 

            (bool success,) = address(this).delegatecall(
                abi.encodeWithSelector(
                    this.partialFillOrderWithTargetPermit.selector,
                    orderInfo.order,
                    orderInfo.signature,
                    takerFillAmountOrder,
                    target,
                    orderInfo.permitTakerAsset,
                    orderInfo.permitMakerAsset
                )
            );
            
            if(success)
                makerFillAmount -= makerFillAmountOrder;
            
            if (makerFillAmount == 0)
                break;
        }
        require(makerFillAmount == 0, "Couldn't swap the requested fill amount");
    }

    /**  
     @dev Partial fill multiple NFT orders
     @param orderInfos Info about each order to fill
     @param target Address of receiver
    */
    function batchFillOrderWithTargetNFT(
        OrderNFTInfo[] calldata orderInfos,
        address target
    )
        public
    {
        for (uint256 i = 0; i < orderInfos.length; i++) {
            OrderNFTInfo calldata orderInfo = orderInfos[i];

            uint256 takerTokenFillAmountOrder = orderInfo.takerTokenFillAmount;
            require(takerTokenFillAmountOrder > 0 && takerTokenFillAmountOrder <= orderInfo.order.takerAmount, "Invalid Taker amount");
            
            uint256 makerTokenFillAmountOrder = (takerTokenFillAmountOrder * orderInfo.order.makerAmount) / orderInfo.order.takerAmount;     
            require(makerTokenFillAmountOrder > 0, "Maker token fill amount cannot be 0");

            _permit(address(uint160(orderInfo.order.takerAsset)), orderInfo.permitTakerAsset);
            _permit(address(uint160(orderInfo.order.makerAsset)), orderInfo.permitMakerAsset);

            _fillOrderNFT(
                orderInfo.order,
                orderInfo.signature,
                makerTokenFillAmountOrder,
                takerTokenFillAmountOrder,
                target
            );
        }
    }



    function _fillOrder(
        Order calldata order,
        bytes calldata signature,
        uint256 makerTokenFillAmount,
        uint256 takerTokenFillAmount,
        address target
    )
        private
    {
        address maker = order.maker;
        bytes32 orderHash = _hashTypedDataV4(keccak256(abi.encode(RFQ_LIMIT_ORDER_TYPEHASH, order)));
        _checkOrder(maker, order.taker, orderHash, order.makerAmount, makerTokenFillAmount, order.expiry, signature);

        //Transfer tokens between maker and taker :)
        transferTokens(order.makerAsset, maker, target, makerTokenFillAmount);
        transferTokens(order.takerAsset, msg.sender, maker, takerTokenFillAmount);

        emit OrderFilled(
            orderHash,
            maker,
            order.makerAsset,
            makerTokenFillAmount,
            target,
            order.takerAsset,
            takerTokenFillAmount
        );
    }

    function _fillOrderNFT(
        OrderNFT calldata order,
        bytes calldata signature,
        uint256 makerTokenFillAmount,
        uint256 takerTokenFillAmount,
        address target
    )
        private
    {
        address maker = order.maker;
        bytes32 orderHash = _hashTypedDataV4(keccak256(abi.encode(RFQ_LIMIT_NFT_ORDER_TYPEHASH, order)));
        _checkOrder(maker, order.taker, orderHash, order.makerAmount, makerTokenFillAmount, order.expiry, signature);

        //Transfer tokens between maker and taker :)
        transferTokensNFT(order.makerAsset, maker, target, makerTokenFillAmount, order.makerAssetId);
        transferTokensNFT(order.takerAsset, msg.sender, maker, takerTokenFillAmount, order.takerAssetId);

        emit OrderFilledNFT(
            orderHash,
            maker,
            order.makerAsset,
            order.makerAssetId,
            makerTokenFillAmount,
            target,
            order.takerAsset,
            order.takerAssetId,
            takerTokenFillAmount
        );
    }


    /**
    * @notice The function assumes orderAmount >= fillRequest, fillRequest > 0
    * and the orderHash is computed correctly 
    * @param maker address Address of the maker
    * @param taker address Address of the taker
    * @param orderHash bytes32 Hash of order
    * @param orderAmount uint256 Max amount the order can fill
    * @param fillRequest uint256 Amount requested for fill
    * @param signature bytes32 Signature for the orderhash
    */
    function _checkOrder(
        address maker,
        address taker,
        bytes32 orderHash,
        uint256 orderAmount,
        uint256 fillRequest,
        uint128 expiry,
        bytes calldata signature
    )
        internal
    {
        // Check time expiration
        require(expiry == 0 || block.timestamp <= expiry, "Order expired");

        // Check if the taker of the order is correct
        require(taker == address(0) || taker == msg.sender, "Access denied");

        mapping (bytes32 => uint256) storage remainingMaker = remaining[maker];
        
        uint256 remainingAmount = remainingMaker[orderHash];
        // You only need to check the signature of the order for the first time
        // For later you already know the orderHash coresponds to the signed order
        if(remainingAmount == UNFILLED_ORDER) {
            require(SignatureChecker.isValidSignatureNow(maker, orderHash, signature), "Invalid Signature");
            remainingMaker[orderHash] = (orderAmount - fillRequest) + 1;
        } else {
            require(remainingAmount > fillRequest, "Order already filled or expired");
            remainingMaker[orderHash] = remainingAmount - fillRequest;
        }
    }



    /**
    * @notice Set remaining[maker][orderHash] = FILLED_ORDER to cancel the order
    * @param maker address Address of the maker for which to cancel the order
    * @param orderHash bytes32 orderHash to be marked as used
    * @return bool True if the orderHash was not marked as used already
    */
    function _cancelOrder(
        address maker,
        bytes32 orderHash
    )
        internal
        returns (bool)
    {
        mapping (bytes32 => uint256) storage remainingMaker = remaining[maker];

        if(remainingMaker[orderHash] == FILLED_ORDER) {
            return false;
        }

        remainingMaker[orderHash] = FILLED_ORDER;
        return true;
    }

    function transferTokens(
        address token,
        address from,
        address to,
        uint256 amount
    )
        private
    {
        IERC20(token).safeTransferFrom(
            from, to, amount
        );
    }

    function transferTokensNFT(
        uint256 token,
        address from,
        address to,
        uint256 amount,
        uint256 id
    )
        private
    {
        uint256 tokenType = token >> 160;
        if (tokenType == 0) {
            IERC20(address(uint160(token))).safeTransferFrom(
                from, to, amount
            );
        } else if (tokenType == 1) {
            IERC1155(address(uint160(token))).safeTransferFrom(
                from, to, id, amount, bytes("")
            );   
        } else if (tokenType == 2) {
            require(amount == 1, "Invalid amount for ERC721 transfer");
            IERC721(address(uint160(token))).safeTransferFrom(
                from, to, id
            );
        } else {
            revert("Invalid token type");
        }
    }

    function _permit(address token, bytes memory permit) internal {
        if (permit.length == 32 * 7) {
            (bool success, ) = token.call(abi.encodePacked(IERC20Permit.permit.selector, permit));
            require(success, "Permit failed");
        }

        if (permit.length == 32 * 8) {
            (bool success, ) = token.call(abi.encodePacked(IERC20PermitLegacy.permit.selector, permit));
            require(success, "Permit failed");
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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));
        }
    }

    /**
     * @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 v4.4.0 (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`, 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 be 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
     * @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;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (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 be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/cryptography/SignatureChecker.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Signature verification helper: Provide a single mechanism to verify both private-key (EOA) ECDSA signature and
 * ERC1271 contract signatures. Using this instead of ECDSA.recover in your contract will make them compatible with
 * smart contract wallets such as Argent and Gnosis.
 *
 * Note: unlike ECDSA signatures, contract signature's 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).
 *
 * _Available since v4.1._
 */
library SignatureChecker {
    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);
    }
}

pragma solidity 0.8.10;

interface IERC20Permit {
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

interface IERC20PermitLegacy {
    function permit(
        address holder,
        address spender,
        uint256 nonce,
        uint256 expiry,
        bool allowed,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (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;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 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 v4.4.0 (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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.0 (utils/Address.sol)

pragma solidity ^0.8.0;

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

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

        (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 v4.4.0 (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
// OpenZeppelin Contracts v4.4.0 (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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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AugustusRFQ.OrderInfo[]","name":"orderInfos","type":"tuple[]"},{"internalType":"address","name":"target","type":"address"}],"name":"batchFillOrderWithTarget","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"uint256","name":"makerAsset","type":"uint256"},{"internalType":"uint256","name":"makerAssetId","type":"uint256"},{"internalType":"uint256","name":"takerAsset","type":"uint256"},{"internalType":"uint256","name":"takerAssetId","type":"uint256"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct 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AugustusRFQ.OrderNFTInfo[]","name":"orderInfos","type":"tuple[]"},{"internalType":"address","name":"target","type":"address"}],"name":"batchFillOrderWithTargetNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"orderHash","type":"bytes32"}],"name":"cancelOrder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"orderHashes","type":"bytes32[]"}],"name":"cancelOrders","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct 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AugustusRFQ.OrderNFT","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"fillOrderNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct AugustusRFQ.Order","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"address","name":"target","type":"address"}],"name":"fillOrderWithTarget","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"uint256","name":"makerAsset","type":"uint256"},{"internalType":"uint256","name":"makerAssetId","type":"uint256"},{"internalType":"uint256","name":"takerAsset","type":"uint256"},{"internalType":"uint256","name":"takerAssetId","type":"uint256"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct AugustusRFQ.OrderNFT","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"address","name":"target","type":"address"}],"name":"fillOrderWithTargetNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"maker","type":"address"},{"internalType":"bytes32[]","name":"orderHashes","type":"bytes32[]"}],"name":"getRemainingOrderBalance","outputs":[{"internalType":"uint256[]","name":"remainingBalances","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct 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AugustusRFQ.OrderNFT","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"uint256","name":"takerTokenFillAmount","type":"uint256"},{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"permitTakerAsset","type":"bytes"},{"internalType":"bytes","name":"permitMakerAsset","type":"bytes"}],"name":"partialFillOrderWithTargetPermitNFT","outputs":[{"internalType":"uint256","name":"makerTokenFilledAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"remaining","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct AugustusRFQ.Order","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"uint256","name":"takerTokenFillAmount","type":"uint256"},{"internalType":"bytes","name":"permitTakerAsset","type":"bytes"},{"internalType":"bytes","name":"permitMakerAsset","type":"bytes"}],"internalType":"struct AugustusRFQ.OrderInfo[]","name":"orderInfos","type":"tuple[]"},{"internalType":"uint256","name":"makerFillAmount","type":"uint256"},{"internalType":"address","name":"target","type":"address"}],"name":"tryBatchFillOrderMakerAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"components":[{"internalType":"uint256","name":"nonceAndMeta","type":"uint256"},{"internalType":"uint128","name":"expiry","type":"uint128"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"taker","type":"address"},{"internalType":"uint256","name":"makerAmount","type":"uint256"},{"internalType":"uint256","name":"takerAmount","type":"uint256"}],"internalType":"struct AugustusRFQ.Order","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"uint256","name":"takerTokenFillAmount","type":"uint256"},{"internalType":"bytes","name":"permitTakerAsset","type":"bytes"},{"internalType":"bytes","name":"permitMakerAsset","type":"bytes"}],"internalType":"struct AugustusRFQ.OrderInfo[]","name":"orderInfos","type":"tuple[]"},{"internalType":"uint256","name":"takerFillAmount","type":"uint256"},{"internalType":"address","name":"target","type":"address"}],"name":"tryBatchFillOrderTakerAmount","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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