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pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;

/**
 * @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);
}

/**
    @title ERC-1155 Multi Token Standard
    @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1155.md
    Note: The ERC-165 identifier for this interface is 0xd9b67a26.
 */
contract IERC1155 is IERC165 {
    /**
        @dev Either `TransferSingle` or `TransferBatch` MUST emit when tokens are transferred, including zero value transfers as well as minting or burning (see "Safe Transfer Rules" section of the standard).
        The `_operator` argument MUST be msg.sender.
        The `_from` argument MUST be the address of the holder whose balance is decreased.
        The `_to` argument MUST be the address of the recipient whose balance is increased.
        The `_id` argument MUST be the token type being transferred.
        The `_value` argument MUST be the number of tokens the holder balance is decreased by and match what the recipient balance is increased by.
        When minting/creating tokens, the `_from` argument MUST be set to `0x0` (i.e. zero address).
        When burning/destroying tokens, the `_to` argument MUST be set to `0x0` (i.e. zero address).
    */
    event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _value);

    /**
        @dev Either `TransferSingle` or `TransferBatch` MUST emit when tokens are transferred, including zero value transfers as well as minting or burning (see "Safe Transfer Rules" section of the standard).
        The `_operator` argument MUST be msg.sender.
        The `_from` argument MUST be the address of the holder whose balance is decreased.
        The `_to` argument MUST be the address of the recipient whose balance is increased.
        The `_ids` argument MUST be the list of tokens being transferred.
        The `_values` argument MUST be the list of number of tokens (matching the list and order of tokens specified in _ids) the holder balance is decreased by and match what the recipient balance is increased by.
        When minting/creating tokens, the `_from` argument MUST be set to `0x0` (i.e. zero address).
        When burning/destroying tokens, the `_to` argument MUST be set to `0x0` (i.e. zero address).
    */
    event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _values);

    /**
        @dev MUST emit when approval for a second party/operator address to manage all tokens for an owner address is enabled or disabled (absense of an event assumes disabled).
    */
    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

    /**
        @dev MUST emit when the URI is updated for a token ID.
        URIs are defined in RFC 3986.
        The URI MUST point a JSON file that conforms to the "ERC-1155 Metadata URI JSON Schema".
    */
    event URI(string _value, uint256 indexed _id);

    /**
        @notice Transfers `_value` amount of an `_id` from the `_from` address to the `_to` address specified (with safety call).
        @dev Caller must be approved to manage the tokens being transferred out of the `_from` account (see "Approval" section of the standard).
        MUST revert if `_to` is the zero address.
        MUST revert if balance of holder for token `_id` is lower than the `_value` sent.
        MUST revert on any other error.
        MUST emit the `TransferSingle` event to reflect the balance change (see "Safe Transfer Rules" section of the standard).
        After the above conditions are met, this function MUST check if `_to` is a smart contract (e.g. code size > 0). If so, it MUST call `onERC1155Received` on `_to` and act appropriately (see "Safe Transfer Rules" section of the standard).
        @param _from    Source address
        @param _to      Target address
        @param _id      ID of the token type
        @param _value   Transfer amount
        @param _data    Additional data with no specified format, MUST be sent unaltered in call to `onERC1155Received` on `_to`
    */
    function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external;

    /**
        @notice Transfers `_values` amount(s) of `_ids` from the `_from` address to the `_to` address specified (with safety call).
        @dev Caller must be approved to manage the tokens being transferred out of the `_from` account (see "Approval" section of the standard).
        MUST revert if `_to` is the zero address.
        MUST revert if length of `_ids` is not the same as length of `_values`.
        MUST revert if any of the balance(s) of the holder(s) for token(s) in `_ids` is lower than the respective amount(s) in `_values` sent to the recipient.
        MUST revert on any other error.
        MUST emit `TransferSingle` or `TransferBatch` event(s) such that all the balance changes are reflected (see "Safe Transfer Rules" section of the standard).
        Balance changes and events MUST follow the ordering of the arrays (_ids[0]/_values[0] before _ids[1]/_values[1], etc).
        After the above conditions for the transfer(s) in the batch are met, this function MUST check if `_to` is a smart contract (e.g. code size > 0). If so, it MUST call the relevant `ERC1155TokenReceiver` hook(s) on `_to` and act appropriately (see "Safe Transfer Rules" section of the standard).
        @param _from    Source address
        @param _to      Target address
        @param _ids     IDs of each token type (order and length must match _values array)
        @param _values  Transfer amounts per token type (order and length must match _ids array)
        @param _data    Additional data with no specified format, MUST be sent unaltered in call to the `ERC1155TokenReceiver` hook(s) on `_to`
    */
    function safeBatchTransferFrom(address _from, address _to, uint256[] calldata _ids, uint256[] calldata _values, bytes calldata _data) external;

    /**
        @notice Get the balance of an account's Tokens.
        @param _owner  The address of the token holder
        @param _id     ID of the Token
        @return        The _owner's balance of the Token type requested
     */
    function balanceOf(address _owner, uint256 _id) external view returns (uint256);

    /**
        @notice Get the balance of multiple account/token pairs
        @param _owners The addresses of the token holders
        @param _ids    ID of the Tokens
        @return        The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair)
     */
    function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids) external view returns (uint256[] memory);

    /**
        @notice Enable or disable approval for a third party ("operator") to manage all of the caller's tokens.
        @dev MUST emit the ApprovalForAll event on success.
        @param _operator  Address to add to the set of authorized operators
        @param _approved  True if the operator is approved, false to revoke approval
    */
    function setApprovalForAll(address _operator, bool _approved) external;

    /**
        @notice Queries the approval status of an operator for a given owner.
        @param _owner     The owner of the Tokens
        @param _operator  Address of authorized operator
        @return           True if the operator is approved, false if not
    */
    function isApprovedForAll(address _owner, address _operator) external view returns (bool);
}

library UintLibrary {
    function toString(uint256 _i) internal pure returns (string memory) {
        if (_i == 0) {
            return "0";
        }
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (_i != 0) {
            bstr[k--] = byte(uint8(48 + _i % 10));
            _i /= 10;
        }
        return string(bstr);
    }
}

library StringLibrary {
    using UintLibrary for uint256;

    function append(string memory _a, string memory _b) internal pure returns (string memory) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory bab = new bytes(_ba.length + _bb.length);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) bab[k++] = _ba[i];
        for (uint i = 0; i < _bb.length; i++) bab[k++] = _bb[i];
        return string(bab);
    }

    function append(string memory _a, string memory _b, string memory _c) internal pure returns (string memory) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory bbb = new bytes(_ba.length + _bb.length + _bc.length);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) bbb[k++] = _ba[i];
        for (uint i = 0; i < _bb.length; i++) bbb[k++] = _bb[i];
        for (uint i = 0; i < _bc.length; i++) bbb[k++] = _bc[i];
        return string(bbb);
    }

    function recover(string memory message, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        bytes memory msgBytes = bytes(message);
        bytes memory fullMessage = concat(
            bytes("\x19Ethereum Signed Message:\n"),
            bytes(msgBytes.length.toString()),
            msgBytes,
            new bytes(0), new bytes(0), new bytes(0), new bytes(0)
        );
        return ecrecover(keccak256(fullMessage), v, r, s);
    }

    function concat(bytes memory _ba, bytes memory _bb, bytes memory _bc, bytes memory _bd, bytes memory _be, bytes memory _bf, bytes memory _bg) internal pure returns (bytes memory) {
        bytes memory resultBytes = new bytes(_ba.length + _bb.length + _bc.length + _bd.length + _be.length + _bf.length + _bg.length);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) resultBytes[k++] = _ba[i];
        for (uint i = 0; i < _bb.length; i++) resultBytes[k++] = _bb[i];
        for (uint i = 0; i < _bc.length; i++) resultBytes[k++] = _bc[i];
        for (uint i = 0; i < _bd.length; i++) resultBytes[k++] = _bd[i];
        for (uint i = 0; i < _be.length; i++) resultBytes[k++] = _be[i];
        for (uint i = 0; i < _bf.length; i++) resultBytes[k++] = _bf[i];
        for (uint i = 0; i < _bg.length; i++) resultBytes[k++] = _bg[i];
        return resultBytes;
    }
}

library AddressLibrary {
    function toString(address _addr) internal pure returns (string memory) {
        bytes32 value = bytes32(uint256(_addr));
        bytes memory alphabet = "0123456789abcdef";
        bytes memory str = new bytes(42);
        str[0] = '0';
        str[1] = 'x';
        for (uint256 i = 0; i < 20; i++) {
            str[2+i*2] = alphabet[uint8(value[i + 12] >> 4)];
            str[3+i*2] = alphabet[uint8(value[i + 12] & 0x0f)];
        }
        return string(str);
    }
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

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

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

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

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

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

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

contract HasSecondarySaleFees is ERC165 {

    event SecondarySaleFees(uint256 tokenId, address[] recipients, uint[] bps);

    /*
     * bytes4(keccak256('getFeeBps(uint256)')) == 0x0ebd4c7f
     * bytes4(keccak256('getFeeRecipients(uint256)')) == 0xb9c4d9fb
     *
     * => 0x0ebd4c7f ^ 0xb9c4d9fb == 0xb7799584
     */
    bytes4 private constant _INTERFACE_ID_FEES = 0xb7799584;

    constructor() public {
        _registerInterface(_INTERFACE_ID_FEES);
    }

    function getFeeRecipients(uint256 id) public view returns (address payable[] memory);
    function getFeeBps(uint256 id) public view returns (uint[] memory);
}

contract AbstractSale is Ownable {
    using UintLibrary for uint256;
    using AddressLibrary for address;
    using StringLibrary for string;
    using SafeMath for uint256;

    bytes4 private constant _INTERFACE_ID_FEES = 0xb7799584;
    uint private constant maxBuyerFeePercentage = 10000;

    uint public buyerFee = 0;
    address payable public beneficiary;

    /* An ECDSA signature. */
    struct Sig {
        /* v parameter */
        uint8 v;
        /* r parameter */
        bytes32 r;
        /* s parameter */
        bytes32 s;
    }

    constructor(address payable _beneficiary) public {
        beneficiary = _beneficiary;
    }

    function setBuyerFee(uint256 _buyerFee) public onlyOwner {
        require(_buyerFee <= maxBuyerFeePercentage, "max buyer percentage can't be more than 10000");
        buyerFee = _buyerFee;
    }

    function setBeneficiary(address payable _beneficiary) public onlyOwner {
        beneficiary = _beneficiary;
    }

    function prepareMessage(address token, uint256 tokenId, uint256 price, uint256 fee, uint256 nonce) internal pure returns (string memory) {
        string memory result = string(strConcat(
                bytes(token.toString()),
                bytes(". tokenId: "),
                bytes(tokenId.toString()),
                bytes(". price: "),
                bytes(price.toString()),
                bytes(". nonce: "),
                bytes(nonce.toString())
            ));
        if (fee != 0) {
            return result.append(". fee: ", fee.toString());
        } else {
            return result;
        }
    }

    function strConcat(bytes memory _ba, bytes memory _bb, bytes memory _bc, bytes memory _bd, bytes memory _be, bytes memory _bf, bytes memory _bg) internal pure returns (bytes memory) {
        bytes memory resultBytes = new bytes(_ba.length + _bb.length + _bc.length + _bd.length + _be.length + _bf.length + _bg.length);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) resultBytes[k++] = _ba[i];
        for (uint i = 0; i < _bb.length; i++) resultBytes[k++] = _bb[i];
        for (uint i = 0; i < _bc.length; i++) resultBytes[k++] = _bc[i];
        for (uint i = 0; i < _bd.length; i++) resultBytes[k++] = _bd[i];
        for (uint i = 0; i < _be.length; i++) resultBytes[k++] = _be[i];
        for (uint i = 0; i < _bf.length; i++) resultBytes[k++] = _bf[i];
        for (uint i = 0; i < _bg.length; i++) resultBytes[k++] = _bg[i];
        return resultBytes;
    }

    function transferEther(IERC165 token, uint256 tokenId, address payable owner, uint256 total, uint256 sellerFee) internal {
        uint value = transferFeeToBeneficiary(total, sellerFee);
        if (token.supportsInterface(_INTERFACE_ID_FEES)) {
            HasSecondarySaleFees withFees = HasSecondarySaleFees(address(token));
            address payable[] memory recipients = withFees.getFeeRecipients(tokenId);
            uint[] memory fees = withFees.getFeeBps(tokenId);
            require(fees.length == recipients.length);
            for (uint256 i = 0; i < fees.length; i++) {
                (uint newValue, uint current) = subFee(value, total.mul(fees[i]).div(maxBuyerFeePercentage));
                value = newValue;
                recipients[i].transfer(current);
            }
        }
        owner.transfer(value);
    }

    function transferFeeToBeneficiary(uint total, uint sellerFee) internal returns (uint) {
        (uint value, uint sellerFeeValue) = subFee(total, total.mul(sellerFee).div(maxBuyerFeePercentage));
        uint buyerFeeValue = total.mul(buyerFee).div(maxBuyerFeePercentage);
        uint beneficiaryFee = buyerFeeValue.add(sellerFeeValue);
        if (beneficiaryFee > 0) {
            beneficiary.transfer(beneficiaryFee);
        }
        return value;
    }

    function subFee(uint value, uint fee) internal pure returns (uint newValue, uint realFee) {
        if (value > fee) {
            newValue = value - fee;
            realFee = fee;
        } else {
            newValue = 0;
            realFee = value;
        }
    }
}

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

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

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) public view returns (address owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     *
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either {approve} or {setApprovalForAll}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public;
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either {approve} or {setApprovalForAll}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public;
    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);


    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

contract OperatorRole is Context {
    using Roles for Roles.Role;

    event OperatorAdded(address indexed account);
    event OperatorRemoved(address indexed account);

    Roles.Role private _operators;

    constructor () internal {

    }

    modifier onlyOperator() {
        require(isOperator(_msgSender()), "OperatorRole: caller does not have the Operator role");
        _;
    }

    function isOperator(address account) public view returns (bool) {
        return _operators.has(account);
    }

    function _addOperator(address account) internal {
        _operators.add(account);
        emit OperatorAdded(account);
    }

    function _removeOperator(address account) internal {
        _operators.remove(account);
        emit OperatorRemoved(account);
    }
}

contract OwnableOperatorRole is Ownable, OperatorRole {
    function addOperator(address account) public onlyOwner {
        _addOperator(account);
    }

    function removeOperator(address account) public onlyOwner {
        _removeOperator(account);
    }
}

contract TransferProxy is OwnableOperatorRole {

    function erc721safeTransferFrom(IERC721 token, address from, address to, uint256 tokenId) external onlyOperator {
        token.safeTransferFrom(from, to, tokenId);
    }

    function erc1155safeTransferFrom(IERC1155 token, address _from, address _to, uint256 _id, uint256 _value, bytes calldata _data) external onlyOperator {
        token.safeTransferFrom(_from, _to, _id, _value, _data);
    }
}

contract ERC1155SaleNonceHolder is OwnableOperatorRole {
    // keccak256(token, owner, tokenId) => nonce
    mapping(bytes32 => uint256) public nonces;

    // keccak256(token, owner, tokenId, nonce) => completed amount
    mapping(bytes32 => uint256) public completed;

    function getNonce(address token, uint256 tokenId, address owner) view public returns (uint256) {
        return nonces[getNonceKey(token, tokenId, owner)];
    }

    function setNonce(address token, uint256 tokenId, address owner, uint256 nonce) public onlyOperator {
        nonces[getNonceKey(token, tokenId, owner)] = nonce;
    }

    function getNonceKey(address token, uint256 tokenId, address owner) pure public returns (bytes32) {
        return keccak256(abi.encodePacked(token, tokenId, owner));
    }

    function getCompleted(address token, uint256 tokenId, address owner, uint256 nonce) view public returns (uint256) {
        return completed[getCompletedKey(token, tokenId, owner, nonce)];
    }

    function setCompleted(address token, uint256 tokenId, address owner, uint256 nonce, uint256 _completed) public onlyOperator {
        completed[getCompletedKey(token, tokenId, owner, nonce)] = _completed;
    }

    function getCompletedKey(address token, uint256 tokenId, address owner, uint256 nonce) pure public returns (bytes32) {
        return keccak256(abi.encodePacked(token, tokenId, owner, nonce));
    }
}











contract ERC1155Sale is Ownable, AbstractSale {
    using StringLibrary for string;

    event CloseOrder(address indexed token, uint256 indexed tokenId, address owner, uint256 nonce);
    event Buy(address indexed token, uint256 indexed tokenId, address owner, uint256 price, address buyer, uint256 value);
    uint private constant maxBuyerFeePercentage = 10000;

    bytes constant EMPTY = "";

    TransferProxy public transferProxy;
    ERC1155SaleNonceHolder public nonceHolder;

    constructor(TransferProxy _transferProxy, ERC1155SaleNonceHolder _nonceHolder, address payable beneficiary) AbstractSale(beneficiary) public {
        transferProxy = _transferProxy;
        nonceHolder = _nonceHolder;
    }

    function buy(IERC1155 token, uint256 tokenId, address payable owner, uint256 selling, uint256 buying, uint256 price, uint256 sellerFee, Sig memory signature) public payable {
        uint256 nonce = verifySignature(address(token), tokenId, owner, selling, price, sellerFee, signature);
        uint256 total = price.mul(buying);
        uint256 buyerFeeValue = total.mul(buyerFee).div(maxBuyerFeePercentage);
        require(total.add(buyerFeeValue) == msg.value, "msg.value is incorrect" );
        bool closed = verifyOpenAndModifyState(address(token), tokenId, owner, nonce, selling, buying);

        transferProxy.erc1155safeTransferFrom(token, owner, msg.sender, tokenId, buying, EMPTY);

        transferEther(token, tokenId, owner, total, sellerFee);
        emit Buy(address(token), tokenId, owner, price, msg.sender, buying);
        if (closed) {
            emit CloseOrder(address(token), tokenId, owner, nonce + 1);
        }
    }

    function cancel(address token, uint256 tokenId) public payable {
        uint nonce = nonceHolder.getNonce(token, tokenId, msg.sender);
        nonceHolder.setNonce(token, tokenId, msg.sender, nonce + 1);

        emit CloseOrder(token, tokenId, msg.sender, nonce + 1);
    }

    function verifySignature(address token, uint256 tokenId, address payable owner, uint256 selling, uint256 price, uint256 sellerFee, Sig memory signature) view internal returns (uint256 nonce) {
        nonce = nonceHolder.getNonce(token, tokenId, owner);
        require(prepareMessage(token, tokenId, price, selling, sellerFee, nonce).recover(signature.v, signature.r, signature.s) == owner, "incorrect signature");
    }

    function verifyOpenAndModifyState(address token, uint256 tokenId, address payable owner, uint256 nonce, uint256 selling, uint256 buying) internal returns (bool) {
        uint comp = nonceHolder.getCompleted(token, tokenId, owner, nonce).add(buying);
        require(comp <= selling);
        nonceHolder.setCompleted(token, tokenId, owner, nonce, comp);

        if (comp == selling) {
            nonceHolder.setNonce(token, tokenId, owner, nonce + 1);
            return true;
        }
        return false;
    }

    function prepareMessage(address token, uint256 tokenId, uint256 price, uint256 value, uint256 fee, uint256 nonce) internal pure returns (string memory) {
        return prepareMessage(token, tokenId, price, fee, nonce).append(". value: ", value.toString());
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000005192c67d94d4851bb22c6f9ce0e3d5c7df6928bc000000000000000000000000890c9f3bfbce67d26c1e2319b148ced2023a880f000000000000000000000000e8637989dfe98c60e26b49b62913ba776ef6ceb7

-----Decoded View---------------
Arg [0] : _transferProxy (address): 0x5192c67d94D4851BB22C6f9Ce0E3D5c7Df6928bC
Arg [1] : _nonceHolder (address): 0x890C9f3bFBcE67d26C1e2319B148CeD2023a880f
Arg [2] : beneficiary (address): 0xE8637989dFe98c60E26B49b62913Ba776eF6ceb7

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000005192c67d94d4851bb22c6f9ce0e3d5c7df6928bc
Arg [1] : 000000000000000000000000890c9f3bfbce67d26c1e2319b148ced2023a880f
Arg [2] : 000000000000000000000000e8637989dfe98c60e26b49b62913ba776ef6ceb7