在NFT合约中提供了区别于ERC20的代理人授权功能,可以将自己钱包地址下的所有nft的所有权一次性授权给代理人,不用针对每个nft做单独的授权操作。该功能适用于针对NFT的统一授权,被授权者具备了授权者钱包地址下所有nft的所有权限,可以执行nft的transfer,burn等功能。代理人授权功能代码片段如下:
/**
* @dev Sets or unsets the approval of a given operator
* An operator is allowed to transfer all tokens of the sender on their behalf.
* @param to operator address to set the approval
* @param approved representing the status of the approval to be set
*/
function setApprovalForAll(address to, bool approved) public {
require(to != _msgSender(), "TRC721: approve to caller");
_operatorApprovals[_msgSender()][to] = approved;
emit ApprovalForAll(_msgSender(), to, approved);
}
对应的授权查询接口:
/**
* @dev Tells whether an operator is approved by a given owner.
* @param owner owner address which you want to query the approval of
* @param operator operator address which you want to query the approval of
* @return bool whether the given operator is approved by the given owner
*/
function isApprovedForAll(address owner, address operator) public view returns (bool) {
return _operatorApprovals[owner][operator];
}
判断是否为全权代理人接口:
/**
* @dev Returns whether the given spender can transfer a given token ID.
* @param spender address of the spender to query
* @param tokenId uint256 ID of the token to be transferred
* @return bool whether the msg.sender is approved for the given token ID,
* is an operator of the owner, or is the owner of the token
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
require(_exists(tokenId), "TRC721: operator query for nonexistent token");
address owner = ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
通过接口isApprovedOrOwner判断是否为全权代理人,如果以及获取授权者所有NFT的权限,可以越过所有者执行transfer,burn,mint等相关操作权限。
至此,完成NFT合约中的代理人针对所有NFT的授权功能所有操作流程。
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