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WhitelistSelector.sol
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WhitelistSelector.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
import "./external/chainlink/VRFConsumerBase.sol";
import "./external/openzeppelin/EnumerableSet.sol";
import "./abstract/Ownable.sol";
import "./libraries/SafeERC20.sol";
contract WhitelistSelector is Ownable, VRFConsumerBase {
using SafeERC20 for IERC20;
using EnumerableSet for EnumerableSet.UintSet;
// WL step
event WLWinnerSelected(uint256 timestamp, uint256 wlWinner);
event WLReserveSelected(uint256 timestamp, uint256 wlWinner);
uint256 public kycCount;
uint256 public wlLimit;
string public kycListLink;
string public kycListSha256;
EnumerableSet.UintSet private wlWinners;
EnumerableSet.UintSet private wlReserve;
bool public wlWinnersSelected = false;
EnumerableSet.UintSet internal stepsBeforeWLSelection;
// Chainlink + Randomness
bytes32 internal keyHash;
uint256 internal fee;
uint256 public randomResult;
uint256 public previousWinnerSeed;
/**
* Constructor inherits VRFConsumerBase
*/
constructor(
address _vrfCoordinator,
address _link,
bytes32 _keyHash,
uint256 _fee
)
Ownable(msg.sender)
VRFConsumerBase(
_vrfCoordinator, // VRF Coordinator
_link // LINK Token
)
{
keyHash = _keyHash;
fee = _fee; // LINK fee
}
/// @notice Allows owner to set the VRF keyHash
/// @param _keyHash The keyHash to be used by the VRF
function setKeyHash(bytes32 _keyHash) external onlyOwner {
keyHash = _keyHash;
}
/// @notice Allows owner to set the fee per request required by the VRF
/// @param _fee The fee to be charged for a request
function setFee(uint256 _fee) external onlyOwner {
fee = _fee;
}
/**
* Requests randomness
*/
function getRandomNumber() public returns (bytes32 requestId) {
require(LINK.balanceOf(address(this)) >= fee, "Not enough LINK - provide LINK to the contract");
return requestRandomness(keyHash, fee);
}
/**
* Callback function used by VRF Coordinator
*/
function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override {
randomResult = randomness;
if (!stepsBeforeWLSelection.contains(1)) {
stepsBeforeWLSelection.add(1);
}
}
function setKycNumber(uint256 number) public onlyOwner {
require(!wlWinnersSelected, "WL selection performed");
kycCount = number;
if (!stepsBeforeWLSelection.contains(5)) {
stepsBeforeWLSelection.add(5);
}
}
function setWlLimit(uint256 limit) public onlyOwner {
require(!wlWinnersSelected, "WL selection performed");
wlLimit = limit;
if (!stepsBeforeWLSelection.contains(4)) {
stepsBeforeWLSelection.add(4);
}
}
function setKycListLink(string memory link) public onlyOwner {
require(!wlWinnersSelected, "WL selection performed");
kycListLink = link;
if (!stepsBeforeWLSelection.contains(2)) {
stepsBeforeWLSelection.add(2);
}
}
function setKycListSha256(string memory sha256Hash) public onlyOwner {
require(!wlWinnersSelected, "WL selection performed");
kycListSha256 = sha256Hash;
if (!stepsBeforeWLSelection.contains(3)) {
stepsBeforeWLSelection.add(3);
}
}
function selectWLWinners(uint256 count) public onlyOwner {
require(stepsBeforeWLSelection.length() == 5, "WL: Not all steps performed");
require((count + wlWinners.length()) <= wlLimit, "WL: No more winners");
if (previousWinnerSeed == 0) {
previousWinnerSeed = randomResult;
}
for (uint256 i = 0; i < count; i++) {
uint256 winnerSeed;
uint256 winnerIndex;
bool winnerSelected = false;
uint256 nonce = 0;
do {
winnerSeed = uint256(keccak256(abi.encodePacked(previousWinnerSeed, i, nonce)));
winnerIndex = (winnerSeed % kycCount) + 1;
nonce++;
winnerSelected = !wlWinners.contains(winnerIndex);
} while (!winnerSelected);
wlWinners.add(winnerIndex);
previousWinnerSeed = winnerSeed;
emit WLWinnerSelected(block.timestamp, winnerIndex);
}
wlWinnersSelected = true;
}
function getWLWinners() external view returns (uint256[] memory) {
uint256[] memory winners = new uint256[](wlWinners.length());
for (uint256 i = 0; i < wlWinners.length(); i++) {
winners[i] = wlWinners.at(i);
}
return winners;
}
function getWLWinnersInRange(uint256 from, uint256 to) external view returns (uint256[] memory) {
require(from < to, "Incorrect range");
require(to < wlWinners.length(), "Incorrect range");
uint256[] memory winners = new uint256[](to - from + 1);
for (uint256 i = 0; i <= to - from; i++) {
winners[i] = wlWinners.at(i + from);
}
return winners;
}
function selectWLReserve(uint256 count) public onlyOwner {
require(wlWinnersSelected, "WL: selection not performed");
require(wlWinners.length() == wlLimit, "WL: select more winners");
require((count + wlWinners.length() + wlReserve.length()) <= kycCount, "WL: No more");
for (uint256 i = 0; i < count; i++) {
uint256 winnerSeed;
uint256 winnerIndex;
bool winnerSelected = false;
uint256 nonce = 0;
do {
winnerSeed = uint256(keccak256(abi.encodePacked(previousWinnerSeed, i, nonce)));
winnerIndex = (winnerSeed % kycCount) + 1;
nonce++;
winnerSelected = !wlWinners.contains(winnerIndex) && !wlReserve.contains(winnerIndex);
} while (!winnerSelected);
wlReserve.add(winnerIndex);
previousWinnerSeed = winnerSeed;
emit WLReserveSelected(block.timestamp, winnerIndex);
}
}
function getWLReserve() external view returns (uint256[] memory) {
uint256[] memory winners = new uint256[](wlReserve.length());
for (uint256 i = 0; i < wlReserve.length(); i++) {
winners[i] = wlReserve.at(i);
}
return winners;
}
function getWLReserveInRange(uint256 from, uint256 to) external view returns (uint256[] memory) {
require(from < to, "Incorrect range");
require(to < wlReserve.length(), "Incorrect range");
uint256[] memory winners = new uint256[](to - from + 1);
for (uint256 i = 0; i <= to - from; i++) {
winners[i] = wlReserve.at(i + from);
}
return winners;
}
function recoverErc20(address token) external onlyOwner {
uint256 amount = IERC20(token).balanceOf(address(this));
if (amount > 0) {
IERC20(token).safeTransfer(owner, amount);
}
}
function recover() external onlyOwner {
payable(owner).transfer(address(this).balance);
}
}