从OpenZeppelin导入ERC1155Burnable失败及ERC1155MintBurn存疑求助

问题说明 #

• 导入@openzeppelin-contracts/token/ERC1155/extensions/ERC1155Burnable.sol时触发找不到文件的错误
• 收到使用ERC1155MintBurn的建议，但该合约在OpenZeppelin库中不存在

错误根源 #

1. 导入路径拼写错误：包名应为@openzeppelin/contracts，而非@openzeppelin-contracts（多了一个连字符）
2. 合约名称误解：OpenZeppelin官方库中没有ERC1155MintBurn这个合约；另外ERC1155Metadata也无需额外继承，因为基础ERC1155合约已包含元数据相关逻辑

修复方案 #

1. 修正导入路径 #

将错误的导入语句：

import "@openzeppelin-contracts/token/ERC1155/extensions/ERC1155Burnable.sol";

替换为正确路径：

import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Burnable.sol";

2. 清理无效的合约继承 #

从合约继承列表中移除ERC1155MintBurn和ERC1155Metadata，修正后的继承结构为：

contract Monion1155 is ERC1155, Ownable, Pausable, ERC2981, ERC1155Supply, ERC1155Holder, ERC1155Burnable {

3. 实现接口支持 #

由于ERC2981是独立合约，需要重写supportsInterface函数来声明对该接口的支持，添加以下代码：

function supportsInterface(bytes4 interfaceId)
    public
    view
    override(ERC1155, ERC2981, ERC1155Holder)
    returns (bool)
{
    return super.supportsInterface(interfaceId);
}

4. 添加铸造逻辑 #

OpenZeppelin的ERC1155默认不提供公开铸造函数，需自行实现（示例为仅所有者可调用）：

function mint(address to, uint256 tokenId, uint256 amount, bytes memory data)
    public
    onlyOwner
    whenNotPaused
{
    _mint(to, tokenId, amount, data);
    emit Minted(tokenId, to, amount);
}

5. 补充必要的重写函数 #

继承ERC1155Supply和Pausable后，需重写_beforeTokenTransfer并集成 pausable 逻辑：

function _beforeTokenTransfer(address operator, address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data)
    internal
    whenNotPaused
    override(ERC1155, ERC1155Supply)
{
    super._beforeTokenTransfer(operator, from, to, ids, amounts, data);
}

function pause() public onlyOwner {
    _pause();
}

function unpause() public onlyOwner {
    _unpause();
}

完整修正后的合约头部示例 #

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Supply.sol";
import "./AdminContract.sol";
import "@openzeppelin/contracts/token/common/ERC2981.sol";
import "@openzeppelin/contracts/token/ERC1155/extensions/ERC1155Burnable.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";

/**
- Contract uses a single URI which is the monion IPFS URI for hosting metadata
- Contract relies on the metadata to store relevant info about the token such as name, description etc.
- Contract issues tokenId to each token minted
- Contract use is cheaper than if the user deployed a fresh instance of the ERC1155
*/

contract Monion1155 is ERC1155, Ownable, Pausable, ERC2981, ERC1155Supply, ERC1155Holder, ERC1155Burnable {
    event Minted (uint indexed tokenId,address indexed owner, uint quantity);

    address operator;
    AdminConsole admin;

    constructor(string memory uri) ERC1155(uri) {}

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC1155, ERC2981, ERC1155Holder)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    function mint(address to, uint256 tokenId, uint256 amount, bytes memory data)
        public
        onlyOwner
        whenNotPaused
    {
        _mint(to, tokenId, amount, data);
        emit Minted(tokenId, to, amount);
    }

    function _beforeTokenTransfer(address operator, address from, address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data)
        internal
        whenNotPaused
        override(ERC1155, ERC1155Supply)
    {
        super._beforeTokenTransfer(operator, from, to, ids, amounts, data);
    }

    function pause() public onlyOwner {
        _pause();
    }

    function unpause() public onlyOwner {
        _unpause();
    }
}

内容的提问来源于stack exchange，提问作者S M