ERC721TransferRestricted
An extension to the ERC721 standard that designates a TRANSFER_APPROVER role that must pre-authorize any token transfers. This may be useful for things like tickets, badges, certificates, or other such tokens where the ability to transfer them should be governed by an administrative entity.
The extension adds the following two functions:
function approveTransfer(
uint256 tokenId,
address recipient
) external virtual onlyRole(TRANSFER_APPROVER_ROLE);
function revokeApproval(
uint256 tokenId
) external virtual onlyRole(TRANSFER_APPROVER_ROLE);The regular transfer semantics (transferFrom() and safeTransferFrom()) will behave as standard, with an additional prior check for authorization of the transfer before reassigning the owner.
Usage
Installing
yarn add @gsgalloway/solidity-erc721-transfer-restricted
Usage
pragma solidity ^0.8.0;
import "@gsgalloway/solidity-erc721-transfer-restricted/contracts/ERC721TransferRestricted.sol";
contract MyCustomNFT is ERC721TransferRestricted {
constructor(address admin, string memory name, string memory symbol) ERC721TransferRestricted(admin, name, symbol) {}
}