文件 1 的 1：Free1.sol
pragma solidity ^0.8.11;
interface IFree {
function mint(uint256 collectionId, address to) external;
function ownerOf(uint256 tokenId) external returns (address owner);
function tokenIdToCollectionId(uint256 tokenId) external returns (uint256 collectionId);
function appendAttributeToToken(uint256 tokenId, string memory attrKey, string memory attrValue) external;
}
contract Free1 {
IFree public immutable free;
uint public mintCount;
mapping(uint256 => bool) public free0TokenIdUsed;
constructor(address freeAddr) {
free = IFree(freeAddr);
}
function claim(uint free0TokenId) public {
require(mintCount < 1000, 'Cannot mint more than 1000');
require(free.tokenIdToCollectionId(free0TokenId) == 0, 'Invalid Free0');
require(!free0TokenIdUsed[free0TokenId], 'This Free0 has already been used to mint a Free1');
require(free.ownerOf(free0TokenId) == msg.sender, 'You must be the owner of this Free0');
free0TokenIdUsed[free0TokenId] = true;
mintCount++;
free.appendAttributeToToken(free0TokenId, 'Used For Free1 Mint', 'true');
free.mint(1, msg.sender);
}
}
{
"compilationTarget": {
"contracts/Free1.sol": "Free1"
},
"evmVersion": "london",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
