示例合约

pragma solidity ^0.8.2;

// SPDX-License-Identifier: MIT
/**

@dev Interface of the VRC165 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 ({VRC165Checker}).
For an implementation, see {VRC165}.
/
interface IVRC165 {
/**
@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);
}

/**

@dev Required interface of an VRC1155 compliant contract, as defined in the
https://eips.ethereum.org/EIPS/eip-1155[EIP].

Available since v3.1.
/
interface IVRC1155 is IVRC165 {
/**
@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 {IVRC1155MetadataURI-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:VRC1155.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 {IVRC1155Receiver-onVRC1155Received} and return the
 * acceptance magic value.
 */
function safeTransferFrom(
    address from,
    address to,
    uint256 id,
    uint256 amount,
    bytes calldata data
) external;

/**
 * @dev xref:ROOT:VRC1155.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 {IVRC1155Receiver-onVRC1155BatchReceived} and return the
 * acceptance magic value.
 */
function safeBatchTransferFrom(
    address from,
    address to,
    uint256[] calldata ids,
    uint256[] calldata amounts,
    bytes calldata data
) external;

}

/**

@dev Available since v3.1.
/
interface IVRC1155Receiver is IVRC165 {
/**
@dev Handles the receipt of a single VRC1155 token type. This function is
called at the end of a safeTransferFrom after the balance has been updated.
To accept the transfer, this must return
bytes4(keccak256("onVRC1155Received(address,address,uint256,uint256,bytes)"))
(i.e. 0xd37fbeb1, 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("onVRC1155Received(address,address,uint256,uint256,bytes)")) if transfer is allowed
/
function onVRC1155Received(
address operator,
address from,
uint256 id,
uint256 value,
bytes calldata data
) external returns (bytes4);

/**
    @dev Handles the receipt of a multiple VRC1155 token types. This function
    is called at the end of a `safeBatchTransferFrom` after the balances have
    been updated. To accept the transfer(s), this must return
    `bytes4(keccak256("onVRC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
    (i.e. 0xa4f0a8c7, 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("onVRC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
*/
function onVRC1155BatchReceived(
    address operator,
    address from,
    uint256[] calldata ids,
    uint256[] calldata values,
    bytes calldata data
) external returns (bytes4);

}

/**

@dev Interface of the optional VRC1155MetadataExtension interface, as defined
in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
Available since v3.1.
/
interface IVRC1155MetadataURI is IVRC1155 {
/**
@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);
}

/**

@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;
    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");

    (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);
        }
    }
}

}

/**

@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;
}
```
}

/**

@dev Implementation of the {IVRC165} interface.
Contracts that want to implement VRC165 should inherit from this contract and override {supportsInterface} to check
for the additional interface id that will be supported. For example:
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {

return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);

}
Alternatively, {VRC165Storage} provides an easier to use but more expensive implementation.
/
abstract contract VRC165 is IVRC165 {
/**
@dev See {IVRC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IVRC165).interfaceId;
}
}

/**

@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/VRC-1155

Available since v3.1.
*/
contract VRC1155 is Context, VRC165, IVRC1155, IVRC1155MetadataURI {
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 {IVRC165-supportsInterface}.
 */
function supportsInterface(bytes4 interfaceId) public view virtual override(VRC165, IVRC165) returns (bool) {
    return
        interfaceId == type(IVRC1155).interfaceId ||
        interfaceId == type(IVRC1155MetadataURI).interfaceId ||
        super.supportsInterface(interfaceId);
}

/**
 * @dev See {IVRC1155MetadataURI-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 {IVRC1155-balanceOf}.
 *
 * Requirements:
 *
 * - `account` cannot be the zero address.
 */
function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
    require(account != address(0), "VRC1155: balance query for the zero address");
    return _balances[id][account];
}

/**
 * @dev See {IVRC1155-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, "VRC1155: 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 {IVRC1155-setApprovalForAll}.
 */
function setApprovalForAll(address operator, bool approved) public virtual override {
    require(_msgSender() != operator, "VRC1155: setting approval status for self");

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

/**
 * @dev See {IVRC1155-isApprovedForAll}.
 */
function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
    return _operatorApprovals[account][operator];
}

/**
 * @dev See {IVRC1155-safeTransferFrom}.
 */
function safeTransferFrom(
    address from,
    address to,
    uint256 id,
    uint256 amount,
    bytes memory data
) public virtual override {
    require(
        from == _msgSender() || isApprovedForAll(from, _msgSender()),
        "VRC1155: caller is not owner nor approved"
    );
    _safeTransferFrom(from, to, id, amount, data);
}

/**
 * @dev See {IVRC1155-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()),
        "VRC1155: 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 {IVRC1155Receiver-onVRC1155Received} 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), "VRC1155: 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, "VRC1155: 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:VRC1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
 *
 * Emits a {TransferBatch} event.
 *
 * Requirements:
 *
 * - If `to` refers to a smart contract, it must implement {IVRC1155Receiver-onVRC1155BatchReceived} 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, "VRC1155: ids and amounts length mismatch");
    require(to != address(0), "VRC1155: 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, "VRC1155: 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 `account`.
 *
 * Emits a {TransferSingle} event.
 *
 * Requirements:
 *
 * - `account` cannot be the zero address.
 * - If `account` refers to a smart contract, it must implement {IVRC1155Receiver-onVRC1155Received} and return the
 * acceptance magic value.
 */
function _mint(
    address account,
    uint256 id,
    uint256 amount,
    bytes memory data
) internal virtual {
    require(account != address(0), "VRC1155: mint to the zero address");

    address operator = _msgSender();

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

    _balances[id][account] += amount;
    emit TransferSingle(operator, address(0), account, id, amount);
    _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data);
}

/**
 * @dev xref:ROOT:VRC1155.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 {IVRC1155Receiver-onVRC1155BatchReceived} 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), "VRC1155: mint to the zero address");
    require(ids.length == amounts.length, "VRC1155: 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 `account`
 *
 * Requirements:
 *
 * - `account` cannot be the zero address.
 * - `account` must have at least `amount` tokens of token type `id`.
 */
function _burn(
    address account,
    uint256 id,
    uint256 amount
) internal virtual {
    require(account != address(0), "VRC1155: burn from the zero address");

    address operator = _msgSender();

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

    uint256 accountBalance = _balances[id][account];
    require(accountBalance >= amount, "VRC1155: burn amount exceeds balance");
    unchecked {
        _balances[id][account] = accountBalance - amount;
    }
    emit TransferSingle(operator, account, address(0), id, amount);
}

/**
 * @dev xref:ROOT:VRC1155.adoc#batch-operations[Batched] version of {_burn}.
 *
 * Requirements:
 *
 * - `ids` and `amounts` must have the same length.
 */
function _burnBatch(
    address account,
    uint256[] memory ids,
    uint256[] memory amounts
) internal virtual {
    require(account != address(0), "VRC1155: burn from the zero address");
    require(ids.length == amounts.length, "VRC1155: ids and amounts length mismatch");

    address operator = _msgSender();

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

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

        uint256 accountBalance = _balances[id][account];
        require(accountBalance >= amount, "VRC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][account] = accountBalance - amount;
        }
    }
    emit TransferBatch(operator, account, address(0), ids, amounts);
}

/**
 * @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 IVRC1155Receiver(to).onVRC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
            if (response != IVRC1155Receiver.onVRC1155Received.selector) {
                revert("VRC1155: VRC1155Receiver rejected tokens");
            }
        } catch Error(string memory reason) {
            revert(reason);
        } catch {
            revert("VRC1155: transfer to non VRC1155Receiver implementer");
        }
    }
}

function _doSafeBatchTransferAcceptanceCheck(
    address operator,
    address from,
    address to,
    uint256[] memory ids,
    uint256[] memory amounts,
    bytes memory data
) private {
    if (to.isContract()) {
        try IVRC1155Receiver(to).onVRC1155BatchReceived(operator, from, ids, amounts, data) returns (
            bytes4 response
        ) {
            if (response != IVRC1155Receiver.onVRC1155BatchReceived.selector) {
                revert("VRC1155: VRC1155Receiver rejected tokens");
            }
        } catch Error(string memory reason) {
            revert(reason);
        } catch {
            revert("VRC1155: transfer to non VRC1155Receiver implementer");
        }
    }
}

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

    return array;
}

}

/**

@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() {
    _setOwner(_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 {
    _setOwner(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");
    _setOwner(newOwner);
}

function _setOwner(address newOwner) private {
    address oldOwner = _owner;
    _owner = newOwner;
    emit OwnershipTransferred(oldOwner, newOwner);
}

}

contract VrcToken1155 is VRC1155, Ownable {
constructor() VRC1155("https://token-cdn-domain/{id}.json") {}

function setURI(string memory newuri) public onlyOwner {
    _setURI(newuri);
}

function mint(address account, uint256 id, uint256 amount, bytes memory data)
    public
    onlyOwner
{
    _mint(account, id, amount, data);
}

function mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data)
    public
    onlyOwner
{
    _mintBatch(to, ids, amounts, data);
}

}