Contract Name:
FT500StakingWithRewards
Contract Source Code:
// 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 v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `from` to `to` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 amount) external 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 (last updated v4.9.0) (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
contract FT500StakingWithRewards is Ownable {
using SafeMath for uint256;
IERC20 public stakingToken;
uint256 public totalStaked;
uint256 public totalRewards;
struct Stake {
uint256 amount;
uint256 startTime;
uint256 duration; // 1, 3, 6, or 12 months represented as seconds
uint256 tier; // Tier 1, 2, 3, 4, or 5
uint256 reward;
uint256 rewardDebt;
}
// Mapping of user addresses to their staking positions
mapping(address => Stake) public stakes;
bool public ethHarvestActive = false;
uint256[5][] public rewardPercentages = [
[200, 400, 800, 1600], // Tier 1
[300, 600, 1200, 1800], // Tier 2
[400, 800, 1600, 2000], // Tier 3
[500, 1000, 2000, 2500], // Tier 4
[800, 1600, 2400, 3200] // Tier 5
];
uint256 internal accRewardPerToken;
// ==============
// CONSTANTS
// ==============
uint256 internal constant PRECISION = 1e18;
// ==============
// EVENTS
// ==============
event Deposit(address indexed user, uint256 indexed stakedAmount);
event Withdraw(address indexed user, uint256 indexed withdrawAmount);
event HarvestEth(address indexed user, uint256 indexed harvestAmount);
event RewardsAdded(uint256 amount);
constructor(address _stakingToken) {
stakingToken = IERC20(_stakingToken);
}
// Stake tokens with a specified lockup period and tier
function stake(uint256 amount, uint256 duration) external {
require(duration == 1 || duration == 3 || duration == 6 || duration == 12, "Invalid duration");
// Transfer tokens to the contract
require(stakingToken.transferFrom(msg.sender, address(this), amount), "Transfer failed");
//check if user already has stake
if(stakes[msg.sender].amount > 0){
totalStaked = totalStaked.sub(stakes[msg.sender].amount);
totalRewards = totalRewards.sub(stakes[msg.sender].reward);
amount += stakes[msg.sender].amount;
}
uint8 tier;
if(amount < 100_000 * 1e18){
tier = 1;
}else if(amount >= 100_000 * 1e18 && amount < 250_000 * 1e18){
tier = 2;
}else if(amount >= 250_000 * 1e18 && amount < 500_000 * 1e18){
tier = 3;
}else if(amount >= 500_000 * 1e18 && amount < 1_000_000 * 1e18){
tier = 4;
}else if(amount >= 1_000_000 * 1e18){
tier = 5;
}
require(tier >= 1 && tier <= 5, "Invalid tier");
uint8 rewardPecentageIndex;
if(duration == 1){
rewardPecentageIndex = 1;
}else if(duration == 3){
rewardPecentageIndex = 2;
}else if(duration == 6){
rewardPecentageIndex = 3;
}else if(duration == 12){
rewardPecentageIndex = 4;
}
uint256 rewardPercentage = rewardPercentages[tier - 1][rewardPecentageIndex - 1];
// use updated amount to calculate reward
uint256 reward = amount.mul(rewardPercentage).div(10_000);
// Update user's staking position
stakes[msg.sender] = Stake(amount, block.timestamp, duration * 30 days, tier, reward, 0);
_updateUserDebt(msg.sender, amount);
// Update total staked amount
totalStaked = totalStaked.add(amount);
// Update total reward
totalRewards = totalRewards.add(reward);
}
// Withdraw staked tokens and rewards
function withdraw() external {
Stake storage userStake = stakes[msg.sender];
require(userStake.amount > 0, "No staking position");
_harvestEth();
uint256 stakedAmount = userStake.amount;
uint256 rewards = stakes[msg.sender].reward;
// Calculate the time elapsed since the start of the stake
uint256 elapsedTime = block.timestamp.sub(userStake.startTime);
//else take earlyWithdrawal fees
// Update total staked amount
totalStaked = totalStaked.sub(stakedAmount);
// update total rewards
totalRewards = totalRewards.sub(rewards);
if(elapsedTime >= userStake.duration){
delete stakes[msg.sender];
//if stake time is elapsed, send rewards and send back staked funds
require(stakingToken.transfer(msg.sender, rewards+stakedAmount), "Transfer failed");
}else{
delete stakes[msg.sender];
// Calculate the early withdrawal fee (10% of the staked amount)
uint256 earlyWithdrawalFee = (stakedAmount.mul(10)).div(100);
// Adjust the staked amount after applying the fee
stakedAmount = stakedAmount.sub(earlyWithdrawalFee);
require(stakingToken.transfer(msg.sender, stakedAmount), "Transfer failed");
}
}
//claim rewards
function claimRewards() external{
// ensure user has stake
Stake storage userStake = stakes[msg.sender];
require(userStake.amount > 0, "No staking position");
uint256 rewards = userStake.reward;
// Calculate the time elapsed since the start of the stake
uint256 elapsedTime = block.timestamp.sub(userStake.startTime);
require(elapsedTime >= userStake.duration, "Staking duration not completed");
totalRewards = totalRewards.sub(rewards);
stakes[msg.sender].reward = 0;
require(stakingToken.transfer(msg.sender, rewards), "Transfer failed");
}
function recommit() external {
// ensure user has stake
Stake storage userStake = stakes[msg.sender];
require(userStake.amount > 0, "No staking position");
uint256 stakedAmount = userStake.amount;
uint256 rewards = userStake.reward;
// Calculate the time elapsed since the start of the stake
uint256 elapsedTime = block.timestamp.sub(userStake.startTime);
require(elapsedTime >= userStake.duration, "Staking duration not completed");
totalStaked = totalStaked.sub(stakedAmount);
totalRewards = totalRewards.sub(rewards);
//update staked amount
stakedAmount = stakedAmount.add(rewards);
//update rewards based on increased amount
uint8 rewardPecentageIndex;
//recalculate reward and tier
uint256 duration = userStake.duration / 30 days;
if(duration == 1){
rewardPecentageIndex = 1;
}else if(duration == 3){
rewardPecentageIndex = 2;
}else if(duration == 6){
rewardPecentageIndex = 3;
}else if(duration == 12){
rewardPecentageIndex = 4;
}
uint8 tier;
if(stakedAmount < 100_000 * 1e18){
tier = 1;
}else if(stakedAmount >= 100_000 * 1e18 && stakedAmount < 250_000 * 1e18){
tier = 2;
}else if(stakedAmount >= 250_000 * 1e18 && stakedAmount < 500_000 * 1e18){
tier = 3;
}else if(stakedAmount >= 500_000 * 1e18 && stakedAmount < 1_000_000 * 1e18){
tier = 4;
}else if(stakedAmount >= 1_000_000 * 1e18){
tier = 5;
}
require(tier >= 1 && tier <= 5, "Invalid tier");
uint256 rewardPercentage = rewardPercentages[tier - 1][rewardPecentageIndex - 1];
// use updated amount to calculate reward
uint256 newReward = stakedAmount.mul(rewardPercentage).div(10_000);
// Update total staked amount
totalStaked = totalStaked.add(stakedAmount);
// Update total reward
totalRewards = totalRewards.add(newReward);
stakes[msg.sender].amount = stakedAmount;
stakes[msg.sender].amount = stakedAmount;
stakes[msg.sender].startTime = block.timestamp;
stakes[msg.sender].duration = duration * 30 days;
stakes[msg.sender].tier = tier;
stakes[msg.sender].reward = newReward;
_updateUserDebt(msg.sender, stakedAmount);
}
// Owner-only function to withdraw any remaining tokens from the contract
function withdrawTokens(address tokenAddress, uint256 amount) external onlyOwner {
IERC20 token = IERC20(tokenAddress);
require(token.balanceOf(address(this)) > 0, "No tokens to withdraw");
require(token.transfer(owner(), amount), "Transfer failed");
}
// Owner-only function to change the staking token
function changeStakingToken(address newToken) external onlyOwner {
stakingToken = IERC20(newToken);
}
// Check if a wallet has staked
function hasStake(address user) external view returns (bool) {
return stakes[user].amount > 0;
}
function withdrawStuckEth(address toAddr) external onlyOwner {
(bool success, ) = toAddr.call{value: address(this).balance}("");
require(success);
}
receive() external payable {}
// =============
// ADMIN
// =============
// Distribute rewards
function distributeRewards(uint amount) external payable onlyOwner {
require(msg.value == amount, "Enter correct amount");
if (totalStaked > 0) accRewardPerToken += (amount * PRECISION) / totalStaked;
emit RewardsAdded(amount);
}
// Harvest rewards
function _harvestEth() internal {
uint256 minimumStakeDuration = 14 days;
Stake memory _stake = stakes[msg.sender];
uint256 elapsedTime = block.timestamp.sub(_stake.startTime);
if(ethHarvestActive && elapsedTime >= minimumStakeDuration){
require(ethHarvestActive, "Harvesting not started");
uint pendingRewards = _pendingHarvestRewards(_stake);
stakes[msg.sender].rewardDebt =
(_stake.amount * accRewardPerToken) /
PRECISION;
(bool success, ) = msg.sender.call{value: pendingRewards}("");
require(success);
emit HarvestEth(msg.sender, pendingRewards);
}
}
function harvestEth() public {
require(ethHarvestActive, "Harvesting not started");
uint256 minimumStakeDuration = 14 days;
Stake memory _stake = stakes[msg.sender];
uint256 elapsedTime = block.timestamp.sub(_stake.startTime);
require(elapsedTime >= minimumStakeDuration, "Minimum staking duration not reached");
_harvestEth();
}
function toggleEthHarvesting(bool _value) external payable onlyOwner {
ethHarvestActive = _value;
}
// Rewards to be harvested
function _pendingHarvestRewards(Stake memory _stake) internal view returns (uint) {
return
(_stake.amount * accRewardPerToken) / PRECISION - _stake.rewardDebt;
}
function _updateUserDebt(address user, uint256 newAmount) internal {
stakes[user].rewardDebt = (newAmount * accRewardPerToken) / PRECISION;
}
function getPendingHarvestRewards() external view returns (uint){
return _pendingHarvestRewards(stakes[msg.sender]);
}
}