Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;
import {Ownable} from "openzeppelin/access/Ownable.sol";
import {IERC721} from "openzeppelin/token/ERC721/IERC721.sol";
contract LucisTrade is Ownable {
/*//////////////////////////////////////////////////////////////////////////
Events
//////////////////////////////////////////////////////////////////////////*/
event SkullClaimed(uint256 indexed _ticketId, uint256 indexed _skullId, address indexed _claimer);
event WinnersSet(
uint256[] _winningTicketIds,
string[] _ticketIdComments,
uint256[] _skullIdsForWinners
);
/*//////////////////////////////////////////////////////////////////////////
Structs
//////////////////////////////////////////////////////////////////////////*/
struct Ticket {
string comment;
uint256 skullId;
}
/*//////////////////////////////////////////////////////////////////////////
State Variables
//////////////////////////////////////////////////////////////////////////*/
uint256 private _semaphore;
address public skullHolder;
IERC721 public skullNFTAddress;
IERC721 public ticketAddress;
mapping(uint256 => Ticket) public winners;
bool public winnersSelected;
/*//////////////////////////////////////////////////////////////////////////
Modifiers
//////////////////////////////////////////////////////////////////////////*/
modifier addressesSet() {
require(skullHolder != address(0), "a0");
require(address(skullNFTAddress) != address(0), "a1");
require(address(ticketAddress) != address(0), "a2");
_;
}
modifier guarded() {
require(_semaphore == 0);
_semaphore = 1;
_;
_semaphore = 0;
}
/*//////////////////////////////////////////////////////////////////////////
Constructor
//////////////////////////////////////////////////////////////////////////*/
constructor(
address _skullHolder,
address _skullNFTAddress,
address _ticketAddress
) {
skullHolder = _skullHolder;
skullNFTAddress = IERC721(_skullNFTAddress);
ticketAddress = IERC721(_ticketAddress);
}
/*//////////////////////////////////////////////////////////////////////////
Admin Functions
//////////////////////////////////////////////////////////////////////////*/
function setSkullHolder(address _skullHolder) external onlyOwner {
skullHolder = _skullHolder;
}
function setSkullNFTAddress(address _skullNFTAddress) external onlyOwner {
skullNFTAddress = IERC721(_skullNFTAddress);
}
function setTicketAddress(address _ticketAddress) external onlyOwner {
ticketAddress = IERC721(_ticketAddress);
}
function setTicketWinnersAndSkulls(
uint256[] calldata _winningTicketIds,
string[] calldata _ticketIdComments,
uint256[] calldata _skullIdsForWinners
) external onlyOwner {
require(_winningTicketIds.length == 3);
require(_ticketIdComments.length == 3);
require(_skullIdsForWinners.length == 3);
for (uint8 i = 0; i < 3; i++) {
winners[_winningTicketIds[i]] = Ticket(
_ticketIdComments[i],
_skullIdsForWinners[i]
);
}
winnersSelected = true;
emit WinnersSet(
_winningTicketIds,
_ticketIdComments,
_skullIdsForWinners
);
}
/*//////////////////////////////////////////////////////////////////////////
External Functions
//////////////////////////////////////////////////////////////////////////*/
function claimSkull(uint256[] calldata _ticketIds) external addressesSet guarded {
require(winnersSelected, "c5");
require(skullNFTAddress.isApprovedForAll(skullHolder, address(this)), "c0");
require(ticketAddress.isApprovedForAll(msg.sender, address(this)), "c1");
require(_ticketIds.length <= 3, "c2");
for (uint8 i = 0; i < _ticketIds.length; i++) {
Ticket memory ticket = winners[_ticketIds[i]];
delete winners[_ticketIds[i]];
require(ticketAddress.ownerOf(_ticketIds[i]) == msg.sender, "c3");
require(bytes(ticket.comment).length != 0, "c4");
skullNFTAddress.safeTransferFrom(skullHolder, msg.sender, ticket.skullId, bytes(ticket.comment));
ticketAddress.safeTransferFrom(msg.sender, skullHolder, _ticketIds[i]);
emit SkullClaimed(_ticketIds[i], ticket.skullId, msg.sender);
}
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
_checkOwner();
_;
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if the sender is not the owner.
*/
function _checkOwner() internal view virtual {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby disabling any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
* or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
* understand this adds an external call which potentially creates a reentrancy vulnerability.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool approved) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}