Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

// File: @openzeppelin/contracts/utils/Context.sol

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with 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;
    }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol



pragma solidity >=0.6.0 <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);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



pragma solidity >=0.6.2 <0.8.0;


/**
 * @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;
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol



pragma solidity >=0.6.2 <0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol



pragma solidity >=0.6.2 <0.8.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



pragma solidity >=0.6.0 <0.8.0;

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

// File: @openzeppelin/contracts/introspection/ERC165.sol



pragma solidity >=0.6.0 <0.8.0;


/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract 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 virtual 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;
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/EnumerableSet.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 v3.3.0, sets of type `bytes32` (`Bytes32Set`), `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];
    }

    // Bytes32Set

    struct Bytes32Set {
        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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, 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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set 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(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, 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(uint160(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(uint160(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(uint160(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(uint160(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));
    }
}

// File: @openzeppelin/contracts/utils/EnumerableMap.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

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

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry 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.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

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

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

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

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }

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

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

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

   /**
    * @dev Returns the element 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(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` 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);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



pragma solidity >=0.6.0 <0.8.0;












/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping (uint256 => string) private _tokenURIs;

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, tokenId.toString()));
    }

    /**
    * @dev Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view virtual returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || ERC721.isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @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.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId); // internal owner

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

// File: @openzeppelin/contracts/access/Ownable.sol

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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.
 */
abstract 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 virtual 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;
    }
}

// File: @openzeppelin/contracts/utils/Counters.sol



pragma solidity >=0.6.0 <0.8.0;


/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// File: contracts/HappyL.sol


pragma solidity >=0.6.0 <0.8.0;

contract HappyLandWummyGurms is ERC721, Ownable 
{
    using Counters for Counters.Counter;
    using SafeMath for uint256;

    uint256 public MAX_TOKENS = 4000;
    bool public saleIsActive = false;
    uint256 public constant price = 12000000000000000; // 0.012 ETH

    Counters.Counter private _tokenIdCounter;

    constructor() ERC721("HappyLand Wummy Gurms", "HLWG") {}

    function safeMint(address to) private 
    {
        _safeMint(to, _tokenIdCounter.current());
        _tokenIdCounter.increment();
    }

    function mintToken() public payable
    {
        require(saleIsActive, "Sale must be active to mint");
        require(totalSupply().add(1) <= MAX_TOKENS, "Purchase would exceed max supply");
        require(balanceOf(msg.sender) == 0, "You already own tokens, sale not allowed");
        require(price <= msg.value, "Ether value sent is not correct");
        
        if (_tokenIdCounter.current() < MAX_TOKENS) {
            safeMint(msg.sender);
        }
    }

    function withdraw() public onlyOwner {
        uint balance = address(this).balance;
        msg.sender.transfer(balance);
    }
    
    function flipSaleState() public onlyOwner {
        saleIsActive = !saleIsActive;
    }

    function setBaseURI(string memory baseURI) public onlyOwner {
        _setBaseURI(baseURI);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"MAX_TOKENS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"flipSaleState","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"saleIsActive","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"baseURI","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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