Contract Name:
NodeStaking
Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)
pragma solidity ^0.8.20;
import {Context} from "../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.
*
* The initial owner is set to the address provided by the deployer. 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;
/**
* @dev The caller account is not authorized to perform an operation.
*/
error OwnableUnauthorizedAccount(address account);
/**
* @dev The owner is not a valid owner account. (eg. `address(0)`)
*/
error OwnableInvalidOwner(address owner);
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the address provided by the deployer as the initial owner.
*/
constructor(address initialOwner) {
if (initialOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_transferOwnership(initialOwner);
}
/**
* @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 {
if (owner() != _msgSender()) {
revert OwnableUnauthorizedAccount(_msgSender());
}
}
/**
* @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 {
if (newOwner == address(0)) {
revert OwnableInvalidOwner(address(0));
}
_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 v5.0.1) (utils/Context.sol)
pragma solidity ^0.8.20;
/**
* @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;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 0;
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Pausable.sol)
pragma solidity ^0.8.20;
import {Context} from "../utils/Context.sol";
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
* This module is used through inheritance. It will make available the
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to
* the functions of your contract. Note that they will not be pausable by
* simply including this module, only once the modifiers are put in place.
*/
abstract contract Pausable is Context {
bool private _paused;
/**
* @dev Emitted when the pause is triggered by `account`.
*/
event Paused(address account);
/**
* @dev Emitted when the pause is lifted by `account`.
*/
event Unpaused(address account);
/**
* @dev The operation failed because the contract is paused.
*/
error EnforcedPause();
/**
* @dev The operation failed because the contract is not paused.
*/
error ExpectedPause();
/**
* @dev Initializes the contract in unpaused state.
*/
constructor() {
_paused = false;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
modifier whenNotPaused() {
_requireNotPaused();
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*
* Requirements:
*
* - The contract must be paused.
*/
modifier whenPaused() {
_requirePaused();
_;
}
/**
* @dev Returns true if the contract is paused, and false otherwise.
*/
function paused() public view virtual returns (bool) {
return _paused;
}
/**
* @dev Throws if the contract is paused.
*/
function _requireNotPaused() internal view virtual {
if (paused()) {
revert EnforcedPause();
}
}
/**
* @dev Throws if the contract is not paused.
*/
function _requirePaused() internal view virtual {
if (!paused()) {
revert ExpectedPause();
}
}
/**
* @dev Triggers stopped state.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}
/**
* @dev Returns to normal state.
*
* Requirements:
*
* - The contract must be paused.
*/
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)
pragma solidity ^0.8.20;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant NOT_ENTERED = 1;
uint256 private constant ENTERED = 2;
uint256 private _status;
/**
* @dev Unauthorized reentrant call.
*/
error ReentrancyGuardReentrantCall();
constructor() {
_status = NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be NOT_ENTERED
if (_status == ENTERED) {
revert ReentrancyGuardReentrantCall();
}
// Any calls to nonReentrant after this point will fail
_status = ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == ENTERED;
}
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.24;
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/utils/Pausable.sol';
interface IERC20 {
function transfer(address recipient, uint256 amount) external returns (bool);
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
function balanceOf(address account) external view returns (uint256);
function approve(address spender, uint256 value) external returns (bool);
}
contract NodeStaking is ReentrancyGuard, Ownable, Pausable {
IERC20 public stakingToken;
struct Stake {
uint256 amount;
uint256 startTime;
uint256 rewardPaid;
}
mapping(address => Stake[]) public stakes;
mapping(address => uint256) public totalUserRewards;
address[] public stakers;
mapping(address => bool) public isStaker;
uint256 public totalRewards = 0;
uint256 public totalStaked;
uint256 public earlyUnstakePenality = 30;
uint256 public maxTotalStaked = 10_000_000 * (10 ** 18); // Example: 10 million tokens
uint256 public maxPerWallet = 1_000 * (10 ** 18); // Example: 1,000 tokens per wallet
uint256 public constant stakingPeriod = 30 days;
address public constant deadWallet =
0x000000000000000000000000000000000000dEaD;
event Staked(address indexed user, uint256 amount, uint256 index);
event Unstaked(address indexed user, uint256 amount, uint256 index);
event RewardPaid(address indexed user, uint256 reward);
event Migrated(
address indexed newStakingContract,
uint256 tokenAmount,
uint256 ethAmount
);
/* Initializes the constructure with the staking token set and owner */
constructor(address _stakingToken) Ownable(_msgSender()) {
stakingToken = IERC20(_stakingToken);
}
/* Sets the staking token */
function setStakingToken(address _stakingToken) external onlyOwner {
require(_stakingToken != address(0), 'Invalid address');
stakingToken = IERC20(_stakingToken);
}
/* Sets the maximum total staked amount */
function setMaxTotalStaked(uint256 _maxTotalStaked) external onlyOwner {
maxTotalStaked = _maxTotalStaked;
}
/* Sets the maximum staked amount per wallet */
function setMaxPerWallet(uint256 _maxPerWallet) external onlyOwner {
maxPerWallet = _maxPerWallet;
}
/* Sets the pause state of the contract */
function setPaused(bool _paused) external onlyOwner {
require(_paused != paused(), 'Already in the requested state');
if (_paused) {
_pause();
} else {
_unpause();
}
}
/* Migrates the staking contract to a new contract */
function migrate(address _newStakingContract) external onlyOwner {
require(_newStakingContract != address(0), 'Invalid address');
uint256 contractTokenBalance = stakingToken.balanceOf(address(this));
require(
stakingToken.transfer(_newStakingContract, contractTokenBalance),
'Failed to transfer tokens to owner'
);
uint256 contractETHBalance = address(this).balance;
(bool sent, ) = _newStakingContract.call{value: contractETHBalance}('');
require(sent, 'Failed to transfer ETH');
emit Migrated(
_newStakingContract,
contractTokenBalance,
contractETHBalance
);
}
function stake(uint256 _amount) external nonReentrant whenNotPaused {
require(_amount > 0, 'Amount must be greater than 0');
require(totalStaked + _amount <= maxTotalStaked, 'Staking limit exceeded');
uint256 walletStaked = getWalletStaked(msg.sender);
require(walletStaked + _amount <= maxPerWallet, 'Staking limit exceeded');
if(!isStaker[msg.sender]) {
stakers.push(msg.sender);
isStaker[msg.sender] = true;
}
bool success = stakingToken.transferFrom(msg.sender, address(this), _amount);
require(success, 'Failed to transfer tokens');
stakes[msg.sender].push(Stake(_amount, block.timestamp, 0));
totalStaked += _amount;
emit Staked(msg.sender, _amount, stakes[msg.sender].length - 1);
}
function unstake(uint256 _index, uint256 _amount) external nonReentrant {
require(_index < stakes[msg.sender].length, 'Invalid stake index');
Stake storage userStake = stakes[msg.sender][_index];
require(
block.timestamp >= userStake.startTime + stakingPeriod,
'Stake is still locked'
);
require(userStake.amount >= _amount, 'Insufficient staked amount');
uint256 reward = _claimRewards(msg.sender, _index);
if(reward > 0) {
(bool sent, ) = payable(msg.sender).call{value: reward}('');
require(sent, 'Failed to send Ether');
emit RewardPaid(msg.sender, reward);
}
userStake.amount -= _amount;
totalStaked -= _amount;
if (userStake.amount == 0) {
removeStake(msg.sender, _index);
}
bool success = stakingToken.transfer(msg.sender, _amount);
require(success, 'Failed to transfer tokens');
emit Unstaked(msg.sender, _amount, _index);
}
function earlyUnstake(uint256 _index, uint256 _amount) external nonReentrant {
require(_index < stakes[msg.sender].length, 'Invalid stake index');
Stake storage userStake = stakes[msg.sender][_index];
require(userStake.amount >= _amount, 'Insufficient staked amount');
uint256 timeElapsed = block.timestamp - userStake.startTime;
require(
timeElapsed < stakingPeriod,
'Stake is not in early unstake period'
);
uint256 reward = _claimRewards(msg.sender, _index);
if(reward > 0) {
(bool sent, ) = payable(msg.sender).call{value: reward}('');
require(sent, 'Failed to send Ether');
emit RewardPaid(msg.sender, reward);
}
// Calculate the penalty fee, which linearly decreases from 50% to 0% over the lock-up period
uint256 penaltyPercentage = earlyUnstakePenality -
((timeElapsed * earlyUnstakePenality) / stakingPeriod);
uint256 penaltyAmount = (_amount * penaltyPercentage) / 100;
// Apply the penalty
uint256 returnAmount = _amount - penaltyAmount;
// Update the stake and total staked amount
userStake.amount -= _amount;
totalStaked -= _amount;
// Burn the penalty amount
bool successBurn = stakingToken.transfer(deadWallet, penaltyAmount);
require(successBurn, 'Failed to burn tokens');
// Return the remaining tokens to the user
bool sucessUnstake = stakingToken.transfer(msg.sender, returnAmount);
require(sucessUnstake, 'Failed to transfer tokens');
// Remove the stake if it's fully unstaked
if (userStake.amount == 0) {
removeStake(msg.sender, _index);
}
emit Unstaked(msg.sender, returnAmount, _index);
}
function _claimRewards(
address user,
uint256 index
) private returns (uint256) {
require(index < stakes[user].length, 'Invalid stake index');
Stake storage userStake = stakes[user][index];
uint256 reward = calculateReward(user, index);
if (reward > 0) {
userStake.rewardPaid += reward;
totalUserRewards[user] += reward;
totalRewards += reward;
}
return reward;
}
function claimRewards() external nonReentrant {
uint256 stakeCount = stakes[msg.sender].length;
require(stakeCount > 0, 'No stakes available');
uint256 totalReward = 0;
for (uint256 i = 0; i < stakeCount; i++) {
totalReward += _claimRewards(msg.sender, i); // Aggregate rewards
}
if(totalReward <= 0) {
return;
}
(bool sent, ) = payable(msg.sender).call{value: totalReward}('');
require(sent, 'Failed to send Ether');
emit RewardPaid(msg.sender, totalReward);
}
function getWalletStaked(address _user) public view returns (uint256) {
uint256 walletStaked = 0;
for (uint256 i = 0; i < stakes[_user].length; i++) {
walletStaked += stakes[_user][i].amount;
}
return walletStaked;
}
function getWalletReward(address _user) public view returns (uint256) {
uint256 walletReward = 0;
for (uint256 i = 0; i < stakes[_user].length; i++) {
walletReward += stakes[_user][i].rewardPaid;
}
return walletReward;
}
function getWalletStakes(address _user) public view returns (Stake[] memory) {
return stakes[_user];
}
function getWalletClaimableRewards(
address _user
) public view returns (uint256 totalClaimable) {
totalClaimable = 0;
for (uint256 i = 0; i < stakes[_user].length; i++) {
uint256 reward = calculateReward(_user, i);
totalClaimable += reward;
}
}
function calculateAllPendingRewards() public view returns (uint256 totalClaimable) {
totalClaimable = 0;
for (uint256 i = 0; i < stakers.length; i++) {
address staker = stakers[i];
totalClaimable += getWalletClaimableRewards(staker);
}
}
function calculateReward(
address _user,
uint256 _index
) public view returns (uint256) {
Stake storage userStake = stakes[_user][_index];
uint256 stakeDuration = block.timestamp - userStake.startTime;
if (stakeDuration > stakingPeriod) {
stakeDuration = stakingPeriod; // Cap the stake duration to the lock-up period for reward calculation
}
// Scale the numerator before dividing
uint256 scaledReward = (address(this).balance *
userStake.amount *
stakeDuration) / stakingPeriod;
uint256 reward = scaledReward / totalStaked;
if(userStake.rewardPaid > reward) {
return 0;
}
return reward - userStake.rewardPaid; // Assuming rewardPaid is correctly managed elsewhere
}
function getUserStakingDetails(
address _user
)
public
view
returns (
uint256 _totalStaked,
uint256 totalRewardsInEth,
uint256[] memory timeElapsedPerStake
)
{
_totalStaked = 0;
totalRewardsInEth = 0;
timeElapsedPerStake = new uint256[](stakes[_user].length);
for (uint256 i = 0; i < stakes[_user].length; i++) {
_totalStaked += stakes[_user][i].amount;
totalRewardsInEth += calculateReward(_user, i); // This should return ETH rewards
timeElapsedPerStake[i] = block.timestamp - stakes[_user][i].startTime;
}
}
function removeStake(address _user, uint256 _index) private {
require(_index < stakes[_user].length, 'Invalid stake index');
stakes[_user][_index] = stakes[_user][stakes[_user].length - 1];
stakes[_user].pop();
}
receive() external payable {}
}