Contract 0x53005ae133139eaef5baea1be021d000712b827e

 

Contract Overview

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0 BNB

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$0.00

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0xab679cb1894b4a736feb3347f2b2ce66e93ff184ae910fbd37559edc3b4a6190Offline List112467522021-09-26 9:04:501 hr 46 mins ago0x8ae1beb6dc141f8dfccc7df81a12d3c5d4a90471 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000764475
0x1b1f48f3403d0979868f94e2796b87f000867aaa1d62dc2ac44fe21326e81656Online112467242021-09-26 9:03:261 hr 48 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000567165
0xc0ebcee95de41ceed96b65da8151749fa08435de21814741d58ea73cc21fe66cOffline List112465652021-09-26 8:55:281 hr 56 mins ago0x8ae1beb6dc141f8dfccc7df81a12d3c5d4a90471 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000764475
0xbcb07082e2abf25924a6fcdb836c159ba22517c735b69255685ef973211f0516Offline List112465172021-09-26 8:52:571 hr 58 mins ago0xfca5a6c65dee553916196bbbbd9a8b586675faab IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.006967215
0x84b83e499c085329b454111a4e4e0a2772579d60d47ff72436a7896464652162Offline List112462962021-09-26 8:41:542 hrs 9 mins ago0x1a39bf260150b51bbea4227d53d80b5fa0295c24 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000764475
0x5751f6d1ae0978ae618d8bd00f39f0da2b93ed3c536b69935830f3598db7dba4Online112461862021-09-26 8:36:242 hrs 15 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.00080689
0x353bd76854a4b6aa7e415c0e55eb5b2f7b0f16542078c2dea64daa67cc96f800Offline List112461362021-09-26 8:33:542 hrs 17 mins ago0x8ae1beb6dc141f8dfccc7df81a12d3c5d4a90471 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0x14b7844a043fc26e354fb02a0f4ddc82976edcd8a1437eb22c7a21444cfbf3edOffline List112458212021-09-26 8:18:092 hrs 33 mins ago0x1a39bf260150b51bbea4227d53d80b5fa0295c24 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000764475
0xfdc27f771fbb25dd4f7c3ed7b7cbb7c6796f9123cdbb50bfea415bec5695956aOffline List112458142021-09-26 8:17:482 hrs 33 mins ago0x7765823d85e8f795971ef98d434d2f818a6219cb IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0x9a7a60cd22a16d8d1d75c1a3f7925119d62ab2aaa693db228120a1f800a58796Online112454662021-09-26 8:00:242 hrs 51 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000567045
0x3f2ae88e4b1fa88c54a00bd0c72f1f1422a23d113b76ed91e17408173aaa7bdeOnline112449872021-09-26 7:36:263 hrs 15 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546165
0xaefacf791a5d418935e36beb30188e3e87b743d0278173c255b6fc82f2d17d50Offline List112449562021-09-26 7:34:533 hrs 16 mins ago0xc9dab3034c432ae35dc30d57402eebd7dd9dbb4a IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0x0ff325b8674b42c89223b7bca69c002a06560a2bc8594a4db800bc148399491bOnline112448672021-09-26 7:30:263 hrs 21 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546165
0x2ab0c0421ac8d2eff842d043c7956ee15edaa34e74aec11e979d3be2d571a1bdOffline List112448432021-09-26 7:29:143 hrs 22 mins ago0x05605e6aa0eff0a6c153f24b89400a6a1595cb3c IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0xe0a3a8e2ab0a580081b85ac4703d1cec2d57ecf265f4a578097ec36489744cd9Offline List112448272021-09-26 7:28:263 hrs 23 mins ago0x6eaf627098fbca5a931ae8c4b015af22b21e277a IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.001501675
0xe7e997a3cf55e6700d92d3d1860d81f52aa2eb13044fb4ab76860ea5c31208f3Online112447072021-09-26 7:22:263 hrs 29 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546165
0xc8ea6dded4e22b98cd9bb9d35212411d68bc02dce83411d9d1d22f4ac207fc44Offline List112446682021-09-26 7:20:293 hrs 31 mins ago0x62bbc50664445ab183160406badf8ff7176f948c IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0xbaff7acc77f9247bb60a58a4f7e35e60f3f059d0a93cfff2ea119f06979c9c8dOnline112444262021-09-26 7:07:253 hrs 44 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546105
0xeb6d49abdee92edfffc0ab6e1e5fdd967a9fd9bc4d1d2437e7fc06675cd2fe67Offline List112443962021-09-26 7:05:483 hrs 45 mins ago0x791c70095eb5a47c1b796fff80440f749e2a82d3 IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0x47eb3229c8778b8204620998be04c6002d7360c97970979422aba0e5558c2df7Online112442082021-09-26 6:56:243 hrs 55 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546105
0x49a262860392dd1b7485e84b8368325afdf6d0e36a6bf451924e4ff1a27d4f82Offline List112441902021-09-26 6:55:303 hrs 56 mins ago0x2ba4164e6cb8ec9e21e3cc4cd8f5444762291fcf IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0xc3d3c63c2fe5b1ec16af9a03cfeea1803f1cc0279bffb08986e53b5081265d66Online112441282021-09-26 6:52:243 hrs 59 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.00068989
0xf60247719554e27bf5e1f53de829ef3d8bc149f4ccfa765c99ccf2c4d336da44Online112440682021-09-26 6:49:244 hrs 2 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000546105
0x3565adc9c80a08be154d8484d8f27a3c998f5e3b8a8de28ff8d2f7cf86912fbcOffline List112440242021-09-26 6:47:124 hrs 4 mins ago0x6131ff332f8d5a70c3807c98fc0c6aa30254e55f IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000839475
0x6919d47b6936a5d4df722b15dc32fd7107f9dabfd6a40637fffb68a8b429ad73Online112438482021-09-26 6:38:244 hrs 13 mins ago0x894477107c11c6a9c7da9e35dc94f72217ea960e IN  0x53005ae133139eaef5baea1be021d000712b827e0 BNB0.000588045
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Contract Source Code Verified (Exact Match)

Contract Name:
XWGSwap

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-06-07
*/

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with 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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

pragma solidity ^0.6.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

pragma solidity ^0.6.0;

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

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

    bool private _paused;

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

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

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

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

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

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

pragma solidity ^0.6.0;

/**
 * @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);
}

pragma solidity ^0.6.0;

/**
 * @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) public view override 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 virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

pragma solidity ^0.6.2;

/**
 * @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;
}

pragma solidity ^0.6.0;

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

pragma solidity ^0.6.0;

/**
   * @dev Implementation of the {IERC721Receiver} interface.
   *
   * Accepts all token transfers.
   * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
   */
contract ERC721Holder is IERC721Receiver {

    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

pragma solidity 0.6.12;

interface INFT is IERC721 {

    function mint(address player) external returns (uint256);

}

pragma solidity 0.6.12;

interface INFTRepository {

    function add(uint256 id, uint32[] calldata role, uint grade, uint[] calldata skills, uint fiveElements) external;

    function remove(uint256 id) external;

    function get(uint256 id) external view returns(uint32[] memory role, uint grade, uint[] memory skills, uint fiveElement);

}

pragma solidity 0.6.12;

contract Governances is Ownable {

    event GovernanceAdded(address indexed governance);

    event GovernanceRemoved(address indexed governance);

    mapping(address => bool) public governances;

    function addGovernance(address governance) public onlyOwner {
        governances[governance] = true;
        emit GovernanceAdded(governance);
    }

    function removeGovernance(address governance) public onlyOwner {
        governances[governance] = false;
        emit GovernanceRemoved(governance);
    }

    modifier onlyGovernance() {
        require(governances[_msgSender()], "Token: caller is not the owner");
        _;
    }

}

pragma solidity 0.6.12;

contract XWGSwap is Context, ERC721Holder, Governances, Pausable{

    using EnumerableSet for EnumerableSet.UintSet;

    mapping (address => EnumerableSet.UintSet) private _holderTokens;
    mapping (uint256 => address) private _tokenOwners;

    INFT public nft;
    INFTRepository public nftRepository;

    function initialize(address nftAddr,address nftRepositoryAddr) external onlyOwner {
        nft = INFT(nftAddr);
        nftRepository = INFTRepository(nftRepositoryAddr);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view returns (uint256) {
        require(owner != address(0), "CrownStore: balance query for the zero address");

        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        return _tokenOwners[tokenId];
    }


    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function pause() external virtual onlyOwner whenNotPaused {
        _pause();
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function unpause() external virtual onlyOwner whenPaused {
        _unpause();
    }

    function back(address target, uint256 tokenId) external onlyOwner {
        require(_tokenOwners[tokenId] == address(0), "NFTSwap:token is locked");

        nft.safeTransferFrom(address(this), target, tokenId);
    }

    function offline(uint256 tokenId) public whenNotPaused {
        nft.safeTransferFrom(_msgSender(), address(this), tokenId);
        _holderTokens[_msgSender()].add(tokenId);
        _tokenOwners[tokenId] = _msgSender();
    }

    function offlineList(uint256[] memory tokenList) external whenNotPaused {
        for(uint index=0; index<tokenList.length; index++) {
            offline(tokenList[index]);
        }
    }

    function add(address owner, uint32[] memory role, uint grade, uint[] memory skills, uint fiveElement) private whenNotPaused returns(uint256) {
        uint256 id = nft.mint(owner);
        nftRepository.add(id, role, grade, skills, fiveElement);

        return id;
    }

    function update(uint256 tokenId, address owner, uint32[] memory role, uint grade, uint[] memory skills, uint fiveElement) private whenNotPaused {
        address tokenOwner = _tokenOwners[tokenId];

        if(tokenOwner != address(0)) {
            nft.safeTransferFrom(address(this), owner, tokenId);
            _holderTokens[tokenOwner].remove(tokenId);
            delete _tokenOwners[tokenId];
        }

        nftRepository.add(tokenId, role, grade, skills, fiveElement);
    }

    function online(uint256 tokenId, address owner, uint32[] memory role, uint grade, uint[] memory skills, uint fiveElements) external onlyGovernance whenNotPaused returns(uint256) {
        if(tokenId == 0) {
            return add(owner, role, grade, skills, fiveElements);
        } else {
            update(tokenId, owner, role, grade, skills, fiveElements);
            return tokenId;
        }
    }

    function safeUnlock(uint256 tokenId) external whenPaused {
        require(_tokenOwners[tokenId] == _msgSender(), "NFTSwap: transfer of token that is not own");
        nft.safeTransferFrom(address(this), _msgSender(), tokenId);
    }

}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://cbbca7c9f2982ecd901384aa6751a0bece7668d7f75d20f70bf94e3600ce9206
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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