ExampleERC1155.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import {ERC1155} from "openzeppelin-contracts/token/ERC1155/ERC1155.sol";
import {ERC2981} from "openzeppelin-contracts/token/common/ERC2981.sol";
import {Ownable} from "openzeppelin-contracts/access/Ownable.sol";
import {DefaultOperatorFilterer} from "../DefaultOperatorFilterer.sol";

/**
 * @title  ExampleERC1155
 * @notice This example contract is configured to use the DefaultOperatorFilterer, which automatically registers the
 *         token and subscribes it to OpenSea's curated filters.
 *         Adding the onlyAllowedOperator modifier to the safeTransferFrom methods ensures that
 *         the msg.sender (operator) is allowed by the OperatorFilterRegistry. Adding the onlyAllowedOperatorApproval
 *         modifier to the setApprovalForAll method ensures that owners do not approve operators that are not allowed.
 */
abstract contract ExampleERC1155 is ERC1155(""), ERC2981, DefaultOperatorFilterer, Ownable {
    /**
     * @dev See {IERC1155-setApprovalForAll}.
     *      In this example the added modifier ensures that the operator is allowed by the OperatorFilterRegistry.
     */
    function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {
        super.setApprovalForAll(operator, approved);
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     *      In this example the added modifier ensures that the operator is allowed by the OperatorFilterRegistry.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, uint256 amount, bytes memory data)
        public
        override
        onlyAllowedOperator(from)
    {
        super.safeTransferFrom(from, to, tokenId, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     *      In this example the added modifier ensures that the operator is allowed by the OperatorFilterRegistry.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override onlyAllowedOperator(from) {
        super.safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC1155, ERC2981) returns (bool) {
        return ERC1155.supportsInterface(interfaceId) || ERC2981.supportsInterface(interfaceId);
    }
}