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ERC721AC.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import "../utils/AutomaticValidatorTransferApproval.sol";
import "../utils/CreatorTokenBase.sol";
import "erc721a/contracts/ERC721A.sol";
import {TOKEN_TYPE_ERC721} from "@limitbreak/permit-c/Constants.sol";
/**
* @title ERC721AC
* @author Limit Break, Inc.
* @notice Extends Azuki's ERC721-A implementation with Creator Token functionality, which
* allows the contract owner to update the transfer validation logic by managing a security policy in
* an external transfer validation security policy registry. See {CreatorTokenTransferValidator}.
*/
abstract contract ERC721AC is ERC721A, CreatorTokenBase, AutomaticValidatorTransferApproval {
constructor(string memory name_, string memory symbol_) CreatorTokenBase() ERC721A(name_, symbol_) {}
/**
* @notice Overrides behavior of isApprovedFor all such that if an operator is not explicitly approved
* for all, the contract owner can optionally auto-approve the 721-C transfer validator for transfers.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool isApproved) {
isApproved = super.isApprovedForAll(owner, operator);
if (!isApproved) {
if (autoApproveTransfersFromValidator) {
isApproved = operator == address(getTransferValidator());
}
}
}
/**
* @notice Indicates whether the contract implements the specified interface.
* @dev Overrides supportsInterface in ERC165.
* @param interfaceId The interface id
* @return true if the contract implements the specified interface, false otherwise
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return
interfaceId == type(ICreatorToken).interfaceId ||
interfaceId == type(ICreatorTokenLegacy).interfaceId ||
super.supportsInterface(interfaceId);
}
/**
* @notice Returns the function selector for the transfer validator's validation function to be called
* @notice for transaction simulation.
*/
function getTransferValidationFunction() external pure returns (bytes4 functionSignature, bool isViewFunction) {
functionSignature = bytes4(keccak256("validateTransfer(address,address,address,uint256)"));
isViewFunction = true;
}
/// @dev Ties the erc721a _beforeTokenTransfers hook to more granular transfer validation logic
function _beforeTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual override {
for (uint256 i = 0; i < quantity;) {
_validateBeforeTransfer(from, to, startTokenId + i);
unchecked {
++i;
}
}
}
/// @dev Ties the erc721a _afterTokenTransfer hook to more granular transfer validation logic
function _afterTokenTransfers(
address from,
address to,
uint256 startTokenId,
uint256 quantity
) internal virtual override {
for (uint256 i = 0; i < quantity;) {
_validateAfterTransfer(from, to, startTokenId + i);
unchecked {
++i;
}
}
}
function _msgSenderERC721A() internal view virtual override returns (address) {
return _msgSender();
}
function _tokenType() internal pure override returns(uint16) {
return uint16(TOKEN_TYPE_ERC721);
}
}