Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

// SPDX-License-Identifier: MIT

// 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 Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}


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);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _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;
    }
}

pragma solidity ^0.7.0;
pragma abicoder v2;

contract DoodledPhunks is ERC721, Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    bool public saleIsActive = false;
    uint256 public constant tokenPrice = 0.05 ether;
    uint public constant maxTokenPurchase = 10;
    uint256 public constant MAX_TOKENS = 2500;
    uint256 public constant FREE_TOKENS = 250;
    mapping(address => uint256) private minted;
    
    constructor() ERC721("DoodledPhunks", "DPHUNKS") { }
    
    function withdraw() public onlyOwner {
      (bool success,) = msg.sender.call{value : address(this).balance}('');
      require(success, "Withdrawal failed");
    }

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

    function flipSaleState() public onlyOwner {
        saleIsActive = !saleIsActive;
    }
    
    function tokensOfOwner(address _owner) external view returns(uint256[] memory ) {
        uint256 tokenCount = balanceOf(_owner);
        if (tokenCount == 0) {
            // Return an empty array
            return new uint256[](0);
        } else {
            uint256[] memory result = new uint256[](tokenCount);
            uint256 index;
            for (index = 0; index < tokenCount; index++) {
                result[index] = tokenOfOwnerByIndex(_owner, index);
            }
            return result;
        }
    }
    
    function remainingMint(address user) public view returns (uint256) {
      require(saleIsActive, "Sale isn't active");
      return maxTokenPurchase - minted[user];
    }
    function mintToken(uint numberOfTokens) public payable nonReentrant {
        require(saleIsActive, "Sale must be active to mint");
        require(numberOfTokens > 0 && numberOfTokens <= maxTokenPurchase, "Can only mint 10 tokens at a time");
        require(totalSupply().add(numberOfTokens) <= MAX_TOKENS, "Purchase would exceed max supply");
        
        if (totalSupply().add(numberOfTokens) >= FREE_TOKENS) {
          require(msg.value == tokenPrice.mul(numberOfTokens), "Ether value sent is not correct");
        }

        for(uint i = 0; i < numberOfTokens; i++) {
            uint mintIndex = totalSupply();
            if (totalSupply() < MAX_TOKENS) {
                _safeMint(msg.sender, mintIndex);
            }
        }

        minted[msg.sender] += numberOfTokens;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "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":"FREE_TOKENS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"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":"maxTokenPurchase","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"numberOfTokens","type":"uint256"}],"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":[{"internalType":"address","name":"user","type":"address"}],"name":"remainingMint","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":[],"name":"tokenPrice","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":[{"internalType":"address","name":"_owner","type":"address"}],"name":"tokensOfOwner","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"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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