[英]How to transfer a NFT to another smart contract?
我正在嘗試設置一個托管合同,該合同將存款作為 NFT 存入合同。 我正在努力將 NFT 存入合約。
我首先有一個簡單的 NFT,它被鑄造到帶有 ID 的地址。
contract MyEpicNFT is ERC721URIStorage {
// Magic given to us by OpenZeppelin to help us keep track of tokenIds.
using Counters for Counters.Counter;
Counters.Counter private _tokenIds;
// We need to pass the name of our NFTs token and its symbol.
constructor() ERC721 ("SquareNFT", "SQUARE") {
console.log("This is my NFT contract. Woah!");
console.log(address(this));
}
// A function our user will hit to get their NFT.
function makeNft() public {
uint256 newItemId = _tokenIds.current();
_safeMint(msg.sender, newItemId);
_setTokenURI(newItemId, "https://jsonkeeper.com/b/1LHH");
console.log("An NFT w/ ID %s has been minted to %s", newItemId, msg.sender);
_tokenIds.increment();
}
}
在這種情況下,合約的 msg.sender 已生成 ID 為 0 的 NFT:0xdD870fA1b7C4700F2BD7f44238821C26f7392148
我現在知道我需要批准托管合同才能“花費”此令牌。 為了在 MyEpicNft 合約上執行此操作,我調用 approve function,其中包含 MyEpicNft 的合約地址和鑄造的 NFT 的 ID。
console.log:
This is my NFT contract. Woah!
0x5fc7Dc95b4Bb48dbC9894fCaE417482cb8A6A45a
在我的例子中,我用 (0x5fc7Dc95b4Bb48dbC9894fCaE417482cb8A6A45a, 0) 調用批准 - 這似乎有效。 現在我需要在 NftEscrow 合約中做的是存入 NFT。
我使用的 approve function 來自 ERC721 lib
approve(address to, uint256 tokenId)
有一個 depositNFT function,它采用 NFT 地址——在我們的例子中是 0x5fc7Dc95b4Bb48dbC9894fCaE417482cb8A6A45a 和 0。但是當我這樣做時,我收到錯誤消息:
The transaction has been reverted to the initial state.
Reason provided by the contract: "ERC721: transfer caller is not owner nor approved".
Debug the transaction to get more information.
contract NftEscrow is IERC721Receiver {
enum ProjectState {newEscrow, nftDeposited, cancelNFT, ethDeposited, canceledBeforeDelivery, deliveryInitiated, delivered}
address payable public sellerAddress;
address payable public buyerAddress;
address public nftAddress;
uint256 tokenID;
bool buyerCancel = false;
bool sellerCancel = false;
ProjectState public projectState;
receive() external payable {
}
constructor(){
sellerAddress = payable(msg.sender);
projectState = ProjectState.newEscrow;
}
function onERC721Received( address , address , uint256 , bytes calldata ) public pure override returns (bytes4) {
return this.onERC721Received.selector;
}
function depositNFT(address _NFTAddress, uint256 _TokenID) public onlySeller {
nftAddress = _NFTAddress;
tokenID = _TokenID;
ERC721(nftAddress).safeTransferFrom(msg.sender, address(this), tokenID);
projectState = ProjectState.nftDeposited;
}
function depositEth() public payable {
buyerAddress = payable(msg.sender);
projectState = ProjectState.ethDeposited;
}
function confirmDelivery()public payable {
ERC721(nftAddress).safeTransferFrom(address(this), buyerAddress, tokenID);
sellerAddress.transfer(address(this).balance);
}
modifier onlySeller() {
require(msg.sender == sellerAddress);
_;
}
}
不確定我做錯了什么並且堅持了一天。 為什么我不能將 NFT 存入智能合約?
如果以下任何一項都不為真,您的托管合同將恢復為"ERC721: transfer caller is not owner nor approved"
:
msg.sender
是合約的所有者msg.sender
已為所有人批准msg.sender
被所有者批准用於該令牌根據您的情況,我們選擇第三種選擇。
我們需要檢查的是
當托管合約調用NFT合約時
ERC721(nftAddress).safeTransferFrom(msg.sender, address(this), tokenID);
在 NFT 合約看來, msg.sender
是托管合約。 所以 99% 的問題出在你的審批流程上。 請分享更多相關信息。
編輯:
我們試圖使以下條件為真,其中spender
者是托管合約的地址
return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
如果 getApproved 確實返回了合約地址,請嘗試將以下 function 添加到您的 nft 合約中:
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual override returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721.ownerOf(tokenId);
console.log("spender %s", spender);
console.log("getApproved %s", getApproved(tokenId);
return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
}
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