OCM Dessert

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

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

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/ERC1155.sol)

pragma solidity ^0.8.0;

import "./IERC1155.sol";
import "./IERC1155Receiver.sol";
import "./IERC1155MetadataURI.sol";
import "./Address.sol";
import "./Context.sol";
import "./ERC165.sol";

/**
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
    using Address for address;

    // Mapping from token ID to account balances
    mapping(uint256 => mapping(address => uint256)) private _balances;

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

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string private _uri;

    /**
     * @dev See {_setURI}.
     */
    constructor(string memory uri_) {
        _setURI(uri_);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC1155).interfaceId ||
            interfaceId == type(IERC1155MetadataURI).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) public view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: balance query for the zero address");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not owner nor approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: transfer caller is not owner nor approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data);

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
        _balances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
            _balances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, _asSingletonArray(id), _asSingletonArray(amount), data);

        _balances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }

        emit TransferSingle(operator, from, address(0), id, amount);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC1155: setting approval status for self");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)

pragma solidity ^0.8.0;

import "../IERC1155.sol";

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;

import "./ERC1155.sol";
import "./Ownable.sol";

//   
//    ______     __   __     ______     __  __     ______     __     __   __    
//   /\  __ \   /\ "-.\ \   /\  ___\   /\ \_\ \   /\  __ \   /\ \   /\ "-.\ \   
//   \ \ \/\ \  \ \ \-.  \  \ \ \____  \ \  __ \  \ \  __ \  \ \ \  \ \ \-.  \  
//    \ \_____\  \ \_\\"\_\  \ \_____\  \ \_\ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\ 
//     \/_____/   \/_/ \/_/   \/_____/   \/_/\/_/   \/_/\/_/   \/_/   \/_/ \/_/ 
//                                                                              
//    __    __     ______     __   __     __  __     ______     __  __          
//   /\ "-./  \   /\  __ \   /\ "-.\ \   /\ \/ /    /\  ___\   /\ \_\ \         
//   \ \ \-./\ \  \ \ \/\ \  \ \ \-.  \  \ \  _"-.  \ \  __\   \ \____ \        
//    \ \_\ \ \_\  \ \_____\  \ \_\\"\_\  \ \_\ \_\  \ \_____\  \/\_____\       
//     \/_/  \/_/   \/_____/   \/_/ \/_/   \/_/\/_/   \/_____/   \/_____/       
//                                                                              
//   
// 
// OnChainMonkey (OCM) Genesis was the first 100% On-Chain PFP collection in 1 transaction 
// (contract: 0x960b7a6BCD451c9968473f7bbFd9Be826EFd549A)
// 
// created by Metagood
//
// OCM Desserts is a 100% On-Chain collection in 1 transaction too! It is one that OCM Genesis 
// can eat (burn) to create the new Karma collection.
//
// OCM Desserts, being On-Chain, will also live forever, just like OCM Genesis. However,
// the Desserts will need to be burned to create Karma, so the Dessert supply will be 
// decreasing over time as people burn their Desserts.
//
//
//                            .';cllllc;'.                               
//                       .;dOXMMMMMMMMMMMMXOl'                           
//                     ,xNMMMMMMMMMMMMMMMMMMMMNk,                        
//                   ;0MMMMMMMMMMMMMMMMMMMMMMMMMM0;                      
//                 .kWMMMMMMMMMMMMMMMMMMMMMMMMMMMMMk.                    
//                .KMMMMMMMMMMMMMMMMMMMXo;',c0MMMMMMK.                   
//               ;NMMMMMMMMMMMMMMMMMMM0.      :NMMMMMK.                  
//              lWMMMMMMNd:,;ckWMMMMMMd        oMMMMMMd                  
//             xXWMMMMM0.      ;WMMMMMX.       .XMMMMMWlclll:,.          
//           .Ox;MMMMMMo        dMMMMMMd        cMMMMMMMMMMMMMW0o'       
//          .0d 'MMMMMMK.       .NMMMMMN.        0MMMMMMMMMMMMMMMMO.     
//          Ox   XMMMMMMl        lMMMMMMx        ;MMMMMMMOxkXMMMMMMN'    
//         :N.   lMMMMMMN.       .KMMMMMW,        kMMMMMMc   :NMMMMM0    
//         lK   .cWMMMMMMd        :MMMMMMO        ,WMMMMMX.   cMMMMMM'   
//         ;N:lKWMMMMMMMMW'        0MMMMMM:        xMMMMMMl   xMMMMMN.   
//          KWMMMMMMMMMMMMk        ;WMMMMMK        .NMMMMMN,;OMMMMMMd    
//        .kMMMMMMXOWMMMMMW;        kMMMMMMl        oMMMMMMMMMMMMMMd     
//       ,KMMMMMNc  kMMMMMM0        'WMMMMMX.       .XMMMMMMMMMMMWl      
//      :NWMMMMMd   'WMMMMMMd        dMMMMMMd        cMMMMMMW0OWN:       
//     oK,OMMMMM0.   dMMMMMMW;       .NMMMMMW.        0MMMMMWoK0.        
//    d0. .XMMMMMXl'.;WMMMMMM0        lMMMMMMx        ;MMMMMMMk.         
//   ;W'   .KMMMMMMMMMMMMMMMMMc       .KMMMMMWc        kMMMMMMc          
//   oX      cKMMMMMMMMMMMMMMMK.       :MMMMMMN.       ,WMMMMMX.         
//   :W'       'lx0XNXNMMMMMMMMl        0MMMMMMk       'WMMMMMMo         
//    k0.            .OOKMMMMMMN.       ;MMMMMMMx.    ;KMMMMMMMN'        
//     dK;          .0x ;WMMMMMMd       'WMMMMMMMMX00NMMMMMMMMMMK.       
//      'x0d,.     'Kl   kMMMMMMWd.    ,KMMMMMMMMMMMMMMMMMMMMMMMMo       
//         'lddddooKO    'WMMMMMMMWKO0NMMMMMMMMMMMMMMMMMMMWX0xdNN:       
//                 ,N,    dMMMMMMMMMMMMMMMMMMMMMMMMWXOdl;'.  .OO.        
//                  x0    .NMMMMMMMMMMMMMMMMN0kdc;..        .0x          
//                  .Nc    lMMMMMMMMWX0xo:'.  .';:     .';ldKl           
//                   lX.   'WWXOxl;'.   ,:ok0NMMMMdoxxxxo:,.             
//                   .Ko  'Kk.         .0MMMMMMMMMN,.                    
//                    :N.;Kc    .';ldxxxkWMMMMMMMMMl                     
//                     OXWkcoxxxxo:,.    xMMMMMMMMMX.                    
//                     'xo:,..           .NMMMMMMMMMo                    
//                                        oMMMMMMMMMN.                   
//                                        .XMMMMMMMMM;                   
//                                         ,XMMMMMMWd                    
//                                           ;oxkxl.                     
//                                                                       
//                                                                       
//
//

/// [MIT License]
/// @title Base64
/// @notice Provides a function for encoding some bytes in base64
/// @author Brecht Devos <brecht@loopring.org>
library Base64 {
    bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /// @notice Encodes some bytes to the base64 representation
    function encode(bytes memory data) internal pure returns (string memory) {
        uint256 len = data.length;
        if (len == 0) return "";

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((len + 2) / 3);

        // Add some extra buffer at the end
        bytes memory result = new bytes(encodedLen + 32);
        bytes memory table = TABLE;

        assembly {
            let tablePtr := add(table, 1)
            let resultPtr := add(result, 32)
            for {
                let i := 0
            } lt(i, len) {
            } {
                i := add(i, 3)
                let input := and(mload(add(data, i)), 0xffffff)
                let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
                out := shl(8, out)
                out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
                out := shl(224, out)
                mstore(resultPtr, out)
                resultPtr := add(resultPtr, 4)
            }
            switch mod(len, 3)
            case 1 {
                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
            }
            case 2 {
                mstore(sub(resultPtr, 1), shl(248, 0x3d))
            }
            mstore(result, encodedLen)
        }
        return string(result);
    }
}

contract OCMDesserts is ERC1155, Ownable {
    string private svg1='<svg xmlns="http://www.w3.org/2000/svg" width="999" height="999"><path fill="#fff61d" d="M0 0h999v999H0z"/><g><path d="M0-45V0v-45" id="a"/><animateMotion dur="5s" repeatCount="indefinite" keyPoints="0;.50;1;.50;0" keyTimes="0;.25;.50;.75;1" keySplines="0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1" calcMode="spline"><mpath href="#a"/></animateMotion><g fill="#ff8ff9"><path d="m310 443-30 53 42-11-12-42z"/><circle cx="346" cy="532" r="74" transform="rotate(344 346 532)"/></g><path d="m429 667 257-71-30 54-257 72 30-55zm190-204 78-21-38 69-78 21 38-69z" fill="#d0b"/><path d="m399 722 30-55 39-11-103-369-31 54c-13 24-28 46-16 91l81 290z" fill="#ff8ff9"/><path fill="#af8200" d="m506 675 70.172-20.122 28.115 98.049-70.172 20.122z"/><circle cx="376" cy="477" transform="rotate(344 376 477)" fill="#f0f" r="74"/><circle cx="568" cy="765" transform="rotate(344 568 765)" fill="#af8200" r="35"/><g fill="#f0f"><circle cx="632" cy="406" transform="rotate(344 632 406)" r="74"/><circle cx="481" cy="354" r="133" transform="rotate(344 481 354)"/></g><g fill="#d0b"><circle transform="scale(1 -1) rotate(15.543 1935.567 1139.037)" r="30"/><circle transform="scale(1 -1) rotate(15.543 1803.447 2112.435)" r="30"/></g><path fill="#f0f" d="m352 389 257.289-71.353 77.232 278.489-257.289 71.353z"/><path fill="#ffe386" d="m528 728 68.404-19.025 10.45 37.574-68.404 19.025z"/><path fill="#dab754" d="m511 666 68.25-19.57 17.916 62.482-68.25 19.57z"/><circle cx="573" cy="757" transform="rotate(344 573 757)" fill="#ffe386" r="35"/><path d="m511 666-5 9 7-2-2-7z" fill="#af8200"/><g fill="#ff8ff9"><rect x="390" y="325" width="59" height="290" rx="29" transform="rotate(344 390 325)"/><rect x="494" y="296" width="59" height="290" rx="29" transform="rotate(344 494 296)"/></g><path fill-rule="evenodd" d="M365 604c-23 6-47 0-65-14l31-54c18 14 41 19 65 13l-31 55z" fill="#d0b"/></g><ellipse cx="521" cy="895" rx="73" ry="11" fill-opacity=".2"><animate values="73;90;73" keyTimes="0;.50;1" dur="2.5s" attributeName="rx" fill="freeze" keySplines="0.5 0 0.5 1; 0.5 0 0.5 1" calcMode="spline" repeatCount="indefinite"/></ellipse></svg>';
    string private svg2='<svg xmlns="http://www.w3.org/2000/svg" width="999" height="999"><path fill="#f0f" d="M0 0h999v999H0z"/><g><path d="M0-70V0v-70z" id="a"/><animateMotion dur="6s" repeatCount="indefinite" keyPoints="0;.50;1;.50;0" keyTimes="0;.25;.50;.75;1" keySplines="0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1" calcMode="spline"><mpath href="#a"/></animateMotion><circle cx="496" cy="526" transform="rotate(351 496 526)" fill="#db5" r="245"/><mask id="b" maskUnits="userSpaceOnUse" x="256" y="262" width="491" height="491" mask-type="alpha"><circle cx="501" cy="508" r="245" transform="rotate(351 501 508)" fill="#db5"/></mask><g mask="url(#b)"><circle cx="499" cy="496" transform="rotate(351 499 496)" fill="#fe8" r="246"/></g><mask id="c" maskUnits="userSpaceOnUse" x="185" y="439" width="229" height="230" mask-type="alpha"><circle cx="300" cy="554" transform="rotate(351 300 554)" fill="#db5" r="114"/></mask><g mask="url(#c)"><circle cx="297" cy="541" transform="rotate(351 297 541)" fill="#fe8" r="113"/><circle cx="301" cy="527" transform="rotate(351 301 527)" fill="#5cf" r="96"/></g><mask id="d" maskUnits="userSpaceOnUse" x="621" y="371" width="227" height="226" mask-type="alpha"><circle cx="734" cy="484" transform="rotate(351 734 484)" fill="#db5" r="113"/></mask><g mask="url(#d)"><circle cx="705" cy="486" transform="rotate(351 705 486)" fill="#fe8" r="111"/><circle cx="711" cy="467" transform="rotate(351 711 467)" fill="#5cf" r="95"/></g><mask id="e" maskUnits="userSpaceOnUse" x="257" y="267" width="491" height="491" mask-type="alpha"><path d="M744 473c21 134-69 259-203 281-133 21-259-69-281-203-21-133 69-259 203-281 134-21 259 70 281 203z" fill="#db5"/></mask><g mask="url(#e)"><circle cx="502" cy="473" transform="rotate(351 502 473)" fill="#5cf" r="221"/><circle cx="504" cy="455" transform="rotate(351 504 455)" fill="#67d9fd" r="203"/></g><g fill="#67d9fd"><circle cx="306" cy="509" transform="rotate(351 306 509)" r="71"/><circle cx="711" cy="443" transform="rotate(351 711 443)" r="71"/></g><circle cx="500" cy="466" transform="rotate(351 500 466)" fill="#fe8" r="50"/><mask id="f" maskUnits="userSpaceOnUse" x="450" y="415" width="101" height="102" mask-type="alpha"><circle cx="500" cy="466" r="50" transform="rotate(351 500 466)" fill="#fe8"/></mask><g mask="url(#f)"><circle cx="483" cy="504" transform="rotate(351 483 504)" fill="#db5" r="60"/><circle cx="479" cy="510" transform="rotate(351 479 510)" fill="#f0f" r="43"/></g><path fill-rule="evenodd" d="M540 498c11-11 16-27 13-43-4-28-31-48-59-43-24 4-41 23-43 45 6-16 20-28 37-31 27-4 53 14 57 41 2 11 0 22-5 31z" fill="#5cf"/><path d="m369 367 33.871 2.963-.61 6.973-33.871-2.963zm168-51-32.54 9.856-2.029-6.699 32.54-9.856z" fill="#f0f"/><path d="m431 319 27.507 19.985-4.114 5.663-27.507-19.985zm79 51 31.016-13.928 2.867 6.386-31.016 13.928zm-96 137-11.721-31.916 6.571-2.413 11.721 31.916z" fill="#fe0"/><path d="m458 393-29 17-4-7 29-17 4 7z" fill="#75cc0a"/><path d="m650 467 13.928 31.017-6.386 2.867-13.928-31.017zm-48 116 8.8-32.841 6.761 1.812-8.8 32.841zm1-177-33.129-7.648 1.575-6.821 33.129 7.648z" fill="#f0f"/><path d="m744 434-27.57-19.897 4.096-5.676 27.57 19.897zm-141 14 27.889-19.448 4.004 5.742-27.889 19.448z" fill="#fe0"/><path d="m579 500 32 8-1 7-33-8 2-7zm20-157 24 24-5 5-24-24 5-5zm97 111 31-14 3 7-31 14-3-7z" fill="#75cc0a"/><path d="m502 562-33.871-2.963.61-6.973 33.871 2.963zM368 438l-17 29.445-6.062-3.5 17-29.445z" fill="#f0f"/><path d="m423 596 2.963-33.871 6.973.61-2.963 33.871zm-124-60-27.923-19.399 3.994-5.749 27.923 19.399zm271 16-21.307 26.495-5.455-4.387 21.307-26.495z" fill="#fe0"/><path d="m385 550-17-29 7-4 17 29-7 4zm-88-46 31-14 3 7-31 13-3-6zm226 116-29-17 3-7 30 17-4 7z" fill="#75cc0a"/><g fill="#fff"><path d="M582 298c13 1 42 42 42 42-11-17-27-43-26-53 2-10 13-23 18-26 0 0-19 12-29 9-11-2-39-40-39-40 9 13 26 43 23 52s-16 22-23 28c0 0 22-13 34-12z"><animate attributeName="opacity" values="1;0;1" dur="1s" repeatCount="indefinite"/></path><path d="M236 510c13 2 41 41 41 41-11-16-26-41-25-51 2-10 13-22 17-25 0 0-18 11-28 8-10-2-38-39-38-39 9 13 25 43 22 51-2 9-15 21-22 27 0 0 21-13 33-12z"><animate attributeName="opacity" values="0;1;0" dur="1s" repeatCount="indefinite"/></path></g></g><ellipse cx="500" cy="880" rx="149" ry="17" fill-opacity=".2"><animate values="149;190;149" keyTimes="0;.50;1" dur="3s" attributeName="rx" fill="freeze" keySplines="0.5 0 0.5 1; 0.5 0 0.5 1" calcMode="spline" repeatCount="indefinite"/></ellipse></svg>';
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    address public eatingContract; // allowed to eat/burn Desserts
    address public randomizerContract;
    uint256 private dessertCount = 0; // maximum of 10,000 Desserts can be minted

    constructor() ERC1155("") {}

    // owner will air drop Desserts via this mint function, designed to minimize gas used for multiple mints
    // if ads.length > quantity.length, transaction will fail and no mints will go through
    // if ads.length < quantity.length, the extra values in quantity will be ignored
    function ownerMint(address[] calldata ads, uint256[] calldata quantity, uint256 typeId) external onlyOwner {
        require(typeId>0 && typeId<4, "type err");
        for (uint256 i=0; i<ads.length; i++) {
          require(dessertCount+quantity[i] < 10001, "10k");
          _mint(ads[i], typeId, quantity[i], "");
          dessertCount += quantity[i];
        }
    }

    // owner will air drop Desserts via this mint function, designed to minimize gas used for single mints
    function ownerMint1(address[] calldata ads, uint256 typeId) external onlyOwner {
        require(typeId>0 && typeId<4, "type err");
        require(dessertCount+ads.length < 10001, "10k");
        for (uint256 i=0; i<ads.length; i++) {
          _mint(ads[i], typeId, 1, "");
        }
        dessertCount += ads.length;
    }    

    function setEatingContractAddress(address eatingContractAddress) external onlyOwner {
        eatingContract = eatingContractAddress;
    }

    function setRandomizerContractAddress(address randomizerContractAddress) external onlyOwner {
        randomizerContract = randomizerContractAddress;
    }

    function burnDessertForAddress(uint256 typeId, address burnTokenAddress) external {
        require(msg.sender == eatingContract, "ad err");
        _burn(burnTokenAddress, typeId, 1);
    }

    function uri(uint256 typeId) public view override returns (string memory) {
        require(typeId>0 && typeId<4, "type err");
        bytes memory svg;
        string memory num;
        if (typeId == 1) {
            svg = bytes(svg1);
            num = '1 Incredible Ice Pop","attributes":[{"trait_type": "Dessert Type", "value": "D1';
        } else if (typeId == 2) {
            svg = bytes(svg2);
            num = '2 Divine Donut","attributes":[{"trait_type": "Dessert Type", "value": "D2';
        } else {
            svg = bytes(svg3);
            num = '3 Celestial Cake","attributes":[{"trait_type": "Dessert Type", "value": "D3';
        }
        return string(abi.encodePacked('data:application/json;base64,', Base64.encode(abi.encodePacked(
            '{"name": "D', num, '"}],"image": "data:image/svg+xml;base64,',
            Base64.encode(svg),'"}'))));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

{
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