Cryo Explorer Ethereum Mainnet

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.20;

import "@openzeppelin/[email protected]/security/ReentrancyGuard.sol";
import "@openzeppelin/[email protected]/access/Ownable.sol";
import "@openzeppelin/[email protected]/interfaces/IERC20Metadata.sol";

contract LayerBrett_Staking is ReentrancyGuard, Ownable {
  IERC20Metadata public stakeToken; // Token to be staked and rewarded
  address public presaleContract; //presale contract address
  uint256 public tokensStakedByPresale; //total tokens staked by preSale
  uint256 public tokensStaked; // Total tokens staked

  uint256 private lastRewardedBlock; // Last block number the user had their rewards calculated
  uint256 private accumulatedRewardsPerShare; // Accumulated rewards per share times REWARDS_PRECISION
  uint256 public rewardTokensPerBlock; // Number of reward tokens minted per block
  uint256 private constant REWARDS_PRECISION = 1e12; // A big number to perform mul and div operations
  
  uint256 public lockedTime; //To lock the tokens in contract for definite time.
  bool public harvestLock; //To lock the harvest/claim.
  uint public endBlock; //At this block,the rewards generation will be stopped.
  uint256 public claimStart; //Users can claim after this time in epoch.

  // Staking user for a pool
  struct PoolStaker {
    uint256 amount; // The tokens quantity the user has staked.
    uint256 stakedTime; //the time at tokens staked
    uint256 lastUpdatedBlock;
    uint256 Harvestedrewards; // The reward tokens quantity the user  harvested
    uint256 rewardDebt; // The amount relative to accumulatedRewardsPerShare the user can't get as reward
  }

  //  staker address => PoolStaker
  mapping(address => PoolStaker) public poolStakers;
  mapping(address => bool) public isBlacklisted;
  mapping(address => uint) public userLockedRewards;

  // Events
  event Deposit(address indexed user, uint256 amount);
  event Withdraw(address indexed user, uint256 amount);
  event HarvestRewards(address indexed user, uint256 amount);

  constructor(
    address _rewardTokenAddress,
    uint256 _rewardTokensPerBlock,
    uint _lockTime
  ) {
    stakeToken = IERC20Metadata(_rewardTokenAddress);
    rewardTokensPerBlock = _rewardTokensPerBlock;
    lockedTime = _lockTime;
    harvestLock = true;
  }

  modifier onlyPresale() {
    require(msg.sender == presaleContract, 'This method is only for presale Contract');
    _;
  }

  /**
   * @dev Deposit tokens to the pool
   */
  function deposit(uint256 _amount) external {
    require(block.number < endBlock, 'staking has been ended');
    require(_amount > 0, "Deposit amount can't be zero");

    PoolStaker storage staker = poolStakers[msg.sender];

    // Update pool stakers
    harvestRewards();

    // Update current staker
    staker.amount += _amount;
    staker.rewardDebt = (staker.amount * accumulatedRewardsPerShare) / REWARDS_PRECISION;
    staker.stakedTime = block.timestamp;
    staker.lastUpdatedBlock = block.number;

    // Update pool
    tokensStaked += _amount;

    // Deposit tokens
    emit Deposit(msg.sender, _amount);
    stakeToken.transferFrom(msg.sender, address(this), _amount);
  }

  /**
   * @dev Deposit tokens to  pool by presale contract
   */
  function depositByPresale(address _user, uint256 _amount) external onlyPresale {
    require(block.number < endBlock, 'staking has been ended');
    require(_amount > 0, "Deposit amount can't be zero");

    PoolStaker storage staker = poolStakers[_user];

    // Update pool stakers
    _harvestRewards(_user);

    // Update current staker
    staker.amount += _amount;
    staker.rewardDebt = (staker.amount * accumulatedRewardsPerShare) / REWARDS_PRECISION;
    staker.stakedTime = block.timestamp;

    // Update pool
    tokensStaked += _amount;
    tokensStakedByPresale += _amount;

    // Deposit tokens
    emit Deposit(_user, _amount);
    stakeToken.transferFrom(presaleContract, address(this), _amount);
  }

  /**
   * @dev Withdraw all tokens from existing pool
   */
  function withdraw() external {
    PoolStaker memory staker = poolStakers[msg.sender];
    uint256 amount = staker.amount;
    require(staker.stakedTime + lockedTime <= block.timestamp && claimStart + lockedTime <= block.timestamp, 'you are not allowed to withdraw before locked Time');
    require(amount > 0, "Withdraw amount can't be zero");

    // Pay rewards
    harvestRewards();

    //delete staker
    delete poolStakers[msg.sender];

    // Update pool
    tokensStaked -= amount;

    // Withdraw tokens
    emit Withdraw(msg.sender, amount);
    stakeToken.transfer(msg.sender, amount);
  }

  /**
   * @dev Harvest user rewards
   */
  function harvestRewards() public {
    _harvestRewards(msg.sender);
  }

  /**
   * @dev Harvest user rewards
   */
  function _harvestRewards(address _user) private {
    require(!isBlacklisted[_user], 'This Address is Blacklisted');

    updatePoolRewards();
    PoolStaker storage staker = poolStakers[_user];
    uint256 rewardsToHarvest = ((staker.amount * accumulatedRewardsPerShare) / REWARDS_PRECISION) - staker.rewardDebt;
    if (rewardsToHarvest == 0) {
      return;
    }

    staker.Harvestedrewards += rewardsToHarvest;
    staker.rewardDebt = (staker.amount * accumulatedRewardsPerShare) / REWARDS_PRECISION;
    if (!harvestLock) {
      if (userLockedRewards[_user] > 0) {
        rewardsToHarvest += userLockedRewards[_user];
        userLockedRewards[_user] = 0;
      }
      emit HarvestRewards(_user, rewardsToHarvest);
      stakeToken.transfer(_user, rewardsToHarvest);
    } else {
      userLockedRewards[_user] += rewardsToHarvest;
    }
  }

  /**
   * @dev Update pool's accumulatedRewardsPerShare and lastRewardedBlock
   */
  function updatePoolRewards() private {
    if (tokensStaked == 0) {
      lastRewardedBlock = block.number;
      return;
    }
    uint256 blocksSinceLastReward = block.number > endBlock ? endBlock - lastRewardedBlock : block.number - lastRewardedBlock;
    uint256 rewards = blocksSinceLastReward * rewardTokensPerBlock;
    accumulatedRewardsPerShare = accumulatedRewardsPerShare + ((rewards * REWARDS_PRECISION) / tokensStaked);
    lastRewardedBlock = block.number > endBlock ? endBlock : block.number;
  }

  /**
   *@dev To get the number of rewards that user can get
   */
  function getRewards(address _user) public view returns (uint) {
    if (tokensStaked == 0) {
      return 0;
    }
    uint256 blocksSinceLastReward = block.number > endBlock ? endBlock - lastRewardedBlock : block.number - lastRewardedBlock;
    uint256 rewards = blocksSinceLastReward * rewardTokensPerBlock;
    uint256 accCalc = accumulatedRewardsPerShare + ((rewards * REWARDS_PRECISION) / tokensStaked);
    PoolStaker memory staker = poolStakers[_user];
    return ((staker.amount * accCalc) / REWARDS_PRECISION) - staker.rewardDebt + userLockedRewards[_user];
  }

  function setHarvestLock(bool _harvestlock) external onlyOwner {
    harvestLock = _harvestlock;
  }

  function setPresale(address _presale) external onlyOwner {
    presaleContract = _presale;
  }

  function setStakeToken(address _stakeToken) external onlyOwner {
    stakeToken = IERC20Metadata(_stakeToken);
  }

  function setLockedTime(uint _time) external onlyOwner {
    lockedTime = _time;
  }

  function setEndBlock(uint _endBlock) external onlyOwner {
    endBlock = _endBlock;
  }

  function setClaimStart(uint _claimStart) external onlyOwner {
    claimStart = _claimStart;
  }

  /**
   * @dev To add users to blacklist which restricts blacklisted users from claiming
   * @param _usersToBlacklist addresses of the users
   */
  function blacklistUsers(address[] calldata _usersToBlacklist) external onlyOwner {
    for (uint256 i = 0; i < _usersToBlacklist.length; i++) {
      isBlacklisted[_usersToBlacklist[i]] = true;
    }
  }

  /**
   * @dev To remove users from blacklist which restricts blacklisted users from claiming
   * @param _userToRemoveFromBlacklist addresses of the users
   */
  function removeFromBlacklist(address[] calldata _userToRemoveFromBlacklist) external onlyOwner {
    for (uint256 i = 0; i < _userToRemoveFromBlacklist.length; i++) {
      isBlacklisted[_userToRemoveFromBlacklist[i]] = false;
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/extensions/IERC20Metadata.sol";

// 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) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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;

    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
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // 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: 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 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) (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);
}