Contract Source Code:
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
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 value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` 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 value) external returns (bool);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (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 EIP-1153 (transient storage) is available on the chain you're deploying at,
* consider using {ReentrancyGuardTransient} instead.
*
* 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 ^0.8.20;
interface IManager {
function getContract(string memory name) external view returns (address);
function owner() external view returns (address);
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;
interface IReferral {
function getUserFromCode(bytes32 code) external view returns (address);
function getReferrals(address user) external view returns (address[] memory);
function getTimeOfReferrals(address user) external view returns (uint256[] memory);
function getReferrer(address user) external view returns (address);
function rewardsPerReferral() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.20;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
interface IToken {
/**
* @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 value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` 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 value) external returns (bool);
function mint(address to, uint256 value) external;
function burnFrom(address from, uint256 value) external;
}
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.24;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "./interfaces/IToken.sol";
import "./interfaces/IReferral.sol";
import "./interfaces/IManager.sol";
contract Staking is ReentrancyGuard {
IManager private Manager;
IToken private Token;
IReferral private Referral;
uint256 private depositFee = 0;
uint256 public epochDuration = 6 hours;
uint256 public fullDistributionEpochs = 28; // 28 * 6 hours = 7 days
uint256 private genesisEpochTime;
bool private isStarted = false;
uint256 public totalFueledToken = 0;
uint256 public multiplier;
struct Ticket {
uint256 id;
uint256 baseAmount;
uint256 baseRedeemed;
uint256 boostAmount;
uint256 boostRedeemed;
uint256 creationEpoch;
}
struct Epoch {
uint256 epoch;
bool initialized;
uint256 totalStaked;
}
mapping(address => Ticket[]) public tickets;
mapping(uint256 => Epoch) public epochs;
mapping(address => uint256) public pendingReferralRewards;
//--------------------------------------------------//
constructor(address _manager) {
Manager = IManager(_manager);
}
//--------------------------------------------------//
modifier onlyOwner() {
require(
msg.sender == Manager.owner(),
"Only owner can call this function"
);
_;
}
//--------------------------------------------------//
function setFees(uint256 _depositFee) external onlyOwner {
require(_depositFee < 100, "Fees too high");
depositFee = _depositFee;
}
function setEpochDuration(uint256 _epochDuration) external onlyOwner {
epochDuration = _epochDuration;
}
function setFullDistributionEpochs(
uint256 _fullDistributionEpochs
) external onlyOwner {
fullDistributionEpochs = _fullDistributionEpochs;
}
function startEpoch() external onlyOwner {
require(!isStarted, "Epoch already started");
genesisEpochTime = block.timestamp;
epochs[0] = Epoch(0, true, 0);
isStarted = true;
}
function setAll() external onlyOwner {
Token = IToken(_getContract("Token"));
Referral = IReferral(_getContract("Referral"));
}
function setManager(address _manager) external onlyOwner {
Manager = IManager(_manager);
}
//--------------------------------------------------//
function deposit(uint256 amount, uint8 rate) external nonReentrant {
_deposit(msg.sender, amount, rate);
}
function claim(uint256 id) external nonReentrant {
address sender = msg.sender;
uint256 _rewards = _claim(sender, id);
Token.mint(sender, _rewards);
}
function batchClaim(uint256[] memory ids) external nonReentrant {
address sender = msg.sender;
uint256 _rewards = 0;
for (uint256 i = 0; i < ids.length; i++) {
_rewards += _claim(sender, ids[i]);
}
Token.mint(sender, _rewards);
}
function claimAll() external nonReentrant {
address sender = msg.sender;
uint256 _rewards = 0;
for (uint256 i = 0; i < tickets[sender].length; i++) {
_rewards += _claim(sender, i);
}
Token.mint(sender, _rewards);
}
function claimReferralRewards() external nonReentrant {
address sender = msg.sender;
uint256 availableRewards = pendingReferralRewards[sender];
require(availableRewards > 0, "Nothing to claim");
pendingReferralRewards[sender] = 0;
Token.mint(sender, availableRewards);
}
//--------------------------------------------------//
function _redeemCalculator(
address user,
uint256 id
) private view returns (uint256, uint256) {
uint256 currentEpoch = _getEpoch();
Ticket memory ticket = tickets[user][id];
uint256 _fullDistributionEpochs = fullDistributionEpochs;
uint256 epochsPassed = currentEpoch - ticket.creationEpoch;
epochsPassed = epochsPassed > _fullDistributionEpochs
? _fullDistributionEpochs
: epochsPassed;
uint256 amountToRedeemWithMultiplier = ((ticket.boostAmount *
epochsPassed) / _fullDistributionEpochs) - ticket.boostRedeemed;
uint256 amountToRedeem = ((ticket.baseAmount * epochsPassed) /
_fullDistributionEpochs) - ticket.baseRedeemed;
return (amountToRedeem, amountToRedeemWithMultiplier);
}
function nextEpochRedeemForUserCalculator(
address user,
uint256 id
) public view returns (uint256) {
Ticket memory ticket = tickets[user][id];
uint256 amountToRedeem = ((ticket.boostAmount * 1) /
fullDistributionEpochs) - ticket.boostRedeemed;
return amountToRedeem;
}
function _getEpoch() internal view returns (uint256) {
return (block.timestamp - genesisEpochTime) / epochDuration;
}
function getNextEpoch() public view returns (uint256) {
return genesisEpochTime + (_getEpoch() + 1) * epochDuration;
}
//--------------------------------------------------//
function _deposit(address user, uint256 amount, uint8 rate) private {
require(isStarted, "Epoch not started");
require(rate == 0 || rate == 1, "Invalid rate");
uint256 currentEpoch = _getEpoch();
uint256 amountAfterFee = amount;
uint256 fee;
unchecked {
fee = (amount * depositFee) / 100;
amountAfterFee = amount - fee;
}
totalFueledToken += amountAfterFee;
Token.burnFrom(user, amount);
if (fee > 0) {
Token.transfer(address(Token), fee);
}
tickets[user].push(
Ticket(
tickets[user].length,
amountAfterFee,
0,
(amountAfterFee * multiplier) / 1e18,
0,
currentEpoch
)
);
}
function _claim(address user, uint256 id) private returns (uint256) {
(uint256 base, uint256 boost) = _redeemCalculator(user, id);
if (base == 0) {
return 0;
}
if (Referral.getReferrer(user) != address(0)) {
uint256 referralRewards = (boost * 5) / 100;
pendingReferralRewards[
Referral.getReferrer(user)
] += referralRewards;
}
Ticket storage ticket = tickets[user][id];
ticket.boostRedeemed += boost;
ticket.baseRedeemed += base;
totalFueledToken -= base;
return boost;
}
function _updateMultiplier() private {
uint256 ratio = 3e18 -
((totalFueledToken * 2e18) / Token.totalSupply());
if (ratio < 1e18) {
ratio = 1e18;
} else if (ratio > 3e18) {
ratio = 3e18;
}
multiplier = ratio;
}
function _getContract(
string memory contractName
) internal view returns (address) {
return Manager.getContract(contractName);
}
//--------------------------------------------------//
function getCurrentEpoch() external view returns (uint256) {
return _getEpoch();
}
function getUserTotalStaked(address user) external view returns (uint256) {
uint256 sumToken = 0;
Ticket[] memory ticket = tickets[user];
for (uint256 i = 0; i < tickets[user].length; i++) {
sumToken += ticket[i].baseAmount;
}
return sumToken;
}
function getTotalRedeemableAmountForUser(
address user
) external view returns (uint256) {
uint256 sum = 0;
for (uint256 i = 0; i < tickets[user].length; i++) {
(, uint256 pendingRedeem) = _redeemCalculator(user, i);
sum += pendingRedeem;
}
return sum;
}
function getNextStakingRewardsForAllTicketsForUser(
address user
) external view returns (uint256) {
uint256 sum = 0;
for (uint256 i = 0; i < tickets[user].length; i++) {
sum += nextEpochRedeemForUserCalculator(user, i);
}
return sum;
}
function getTotalTicketsForUser(
address user
) external view returns (uint256) {
return tickets[user].length;
}
}