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以太坊合约开发ERC1155 NFT

以太坊合约开发ERC1155 NFT

作者: Sunooo | 来源:发表于2023-04-18 18:56 被阅读0次

    ERC1155

    ERC1155 是以太坊上的一个标准协议,用于创建可批量铸造、可批量传输的数字资产,如游戏中的物品、收藏品、证书等。每个 ERC1155 合约可以铸造多种类型的资产,每种资产都有一个唯一的 ID,并且每种资产可以有多个实例。这个标准协议定义了一组功能和事件,使得 ERC1155 资产可以被安全地转移、拥有、交易和检索。与 ERC721 不同,ERC1155 允许多种类型的资产被打包在一个交易中,从而使得交易更加高效,并且减少了需要进行的交易数量。这个标准协议具有可扩展性,并且在许多不同的场景下都可以使用,例如游戏、NFT 市场、证券发行等。

    Mint

    可以在以下测试网络自己mint,具体步骤可以参考 Github

    Network Contract Address
    Ethereum Goerli 0xb1ecef869cd9382ae17efb07bd813d49832ea6c1

    开发

    Openzeppelin 的帮助下可以很快的入手开发ERC1155标准的NFT合约。参考之前测试用的NFT代码,自行编译并且发布到了更多的测试网络上,可以很方便的进行ERC1155 NFT测试。
    引入ERC1155库之后,自己只需要实现mint等自定义方法即可,非常简单。
    合约开发使用的是VSCode和hardhat,合约验证使用hardhat flattening

    // SPDX-License-Identifier: MIT
    
    pragma solidity ^0.8.0;
    
    import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
    import "@openzeppelin/contracts/access/Ownable.sol";
    
    contract TestToadz is ERC1155, Ownable {
        uint256 public constant maxTokens = 6969;
        uint256 public numAvailableTokens = 6969;
        uint256 public constant maxMintsPerTx = 5;
        bool public devMintLocked = false;
        uint256[10000] private _availableTokens;
    
        constructor() ERC1155("ipfs://QmWEFSMku6yGLQ9TQr66HjSd9kay8ZDYKbBEfjNi4pLtrr/{id}") {}
    
        function getNumAvailableTokens() public view returns (uint256) {
            return numAvailableTokens;
        }
    
        //Minting
        function mint(uint256 quantity, uint256 amount) public {
            uint256 updatedNumAvailableTokens = numAvailableTokens;
            require(
                block.timestamp >= 1337133769,
                "Sale starts at whatever this time is"
            );
            require(
                quantity <= maxMintsPerTx,
                "There is a limit on minting too many at a time!"
            );
            require(
                updatedNumAvailableTokens - quantity >= 0,
                "Minting this many would exceed supply!"
            );
            require(msg.sender == tx.origin, "No contracts!");
    
            uint256[] memory ids = new uint256[](quantity);
            uint256[] memory amounts = new uint256[](quantity);
    
            for (uint256 i = 0; i < quantity; i++) {
                uint256 tokenId = getRandomSerialToken(quantity, i);
                ids[i] = tokenId;
                amounts[i] = amount;
                updatedNumAvailableTokens--;
            }
    
            _mintBatch(msg.sender, ids, amounts, "");
            numAvailableTokens = updatedNumAvailableTokens;
        }
    
        //Dev mint special tokens
        function mintSpecial(uint256[] memory specialIds, uint256[] memory amounts ) external onlyOwner {
            require(!devMintLocked, "Dev Mint Permanently Locked");
    
            _mintBatch(msg.sender, specialIds, amounts, "");
        }
    
        function getRandomSerialToken(uint256 _numToFetch, uint256 _i)
            internal
            returns (uint256)
        {
            uint256 randomNum = uint256(
                keccak256(
                    abi.encode(
                        msg.sender,
                        tx.gasprice,
                        block.number,
                        block.timestamp,
                        blockhash(block.number - 1),
                        _numToFetch,
                        _i
                )
            )
        );
        uint256 randomIndex = randomNum % numAvailableTokens;
        uint256 valAtIndex = _availableTokens[randomIndex];
        uint256 result;
        if (valAtIndex == 0) {
            result = randomIndex;
        } else {
            result = valAtIndex;
        }
    
        uint256 lastIndex = numAvailableTokens - 1;
        if (randomIndex != lastIndex) {
            uint256 lastValInArray = _availableTokens[lastIndex];
            if (lastValInArray == 0) {
                _availableTokens[randomIndex] = lastIndex;
            } else {
                _availableTokens[randomIndex] = lastValInArray;
            }
        }
    
        numAvailableTokens--;
        return result;
    }
    
    function lockDevMint() public onlyOwner {
        devMintLocked = true;
    }
    }
    
    

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