Contract Source Code (Solidity)

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• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
• library EnumerableSet
•    - function _add(Set storage set, bytes3 ...
•    - function _remove(Set storage set, byt ...
•    - function _contains(Set storage set, b ...
•    - function _length(Set storage set)
•    - function _at(Set storage set, uint256 ...
•    - function add(AddressSet storage set, ...
•    - function remove(AddressSet storage se ...
•    - function contains(AddressSet storage ...
•    - function length(AddressSet storage se ...
•    - function at(AddressSet storage set, u ...
•    - function add(UintSet storage set, uin ...
•    - function remove(UintSet storage set, ...
•    - function contains(UintSet storage set ...
•    - function length(UintSet storage set)
•    - function at(UintSet storage set, uint ...
•  contract Ownable
•    - function transferOwnership(address ne ...
• interface Token
•    - function transferFrom(address, addres ...
•    - function transfer(address, uint)
•  contract CarrotStake is Ownable *
•    - function updateAccount(address accoun ...
•    - function getPendingDivs(address _hold ...
•    - function getNumberOfHolders()
•    - function deposit(uint amountToStake)
•    - function withdraw(uint amountToWithdr ...
•    - function claimDivs()
•    - function getStakingAndDAOAmount()
•    - function transferAnyERC20Tokens(addre ...

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/**
 *Submitted for verification at Etherscan.io on 2020-12-27
*/

/**
   ______                      __  _____ __        __      
  / ____/___ _______________  / /_/ ___// /_____ _/ /_____ 
 / /   / __ `/ ___/ ___/ __ \/ __/\__ \/ __/ __ `/ //_/ _ \
/ /___/ /_/ / /  / /  / /_/ / /_ ___/ / /_/ /_/ / ,< /  __/
\____/\__,_/_/  /_/   \____/\__//____/\__/\__,_/_/|_|\___/ 

*/
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

library EnumerableSet {

    struct Set {
        bytes32[] _values;

        mapping (bytes32 => uint256) _indexes;
    }

    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);

            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
        
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;


            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  constructor() public {
    owner = msg.sender;
  }

  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }
}


interface Token {
    function transferFrom(address, address, uint) external returns (bool);
    function transfer(address, uint) external returns (bool);
}

contract CarrotStake is Ownable {
    using SafeMath for uint;
    using EnumerableSet for EnumerableSet.AddressSet;
    
    event RewardsTransferred(address holder, uint amount);
    
    address public constant tokenAddress = 0xa08dE8f020644DCcd0071b3469b45B08De41C38b;  // Carrot Governance token contract address
    
    // reward rate 395.00% per year
    uint public constant rewardRate = 39500;
    uint public constant rewardInterval = 365 days;  // 7,57% per week
    
    // staking fee 1 %
    uint public constant stakingFeeRate = 100;
    
    // unstaking fee 0.5 %
    uint public constant unstakingFeeRate = 50;
    
    uint public constant unstakeTime = 1 seconds;  // unstaking possible after 1 seconds
    
    uint public totalClaimedRewards = 0;
    
    EnumerableSet.AddressSet private holders;
    
    mapping (address => uint) public depositedTokens;
    mapping (address => uint) public stakingTime;
    mapping (address => uint) public lastClaimedTime;
    mapping (address => uint) public totalEarnedTokens;
    
    function updateAccount(address account) private {
        uint pendingDivs = getPendingDivs(account);
        if (pendingDivs > 0) {
            require(Token(tokenAddress).transfer(account, pendingDivs), "Could not transfer tokens.");
            totalEarnedTokens[account] = totalEarnedTokens[account].add(pendingDivs);
            totalClaimedRewards = totalClaimedRewards.add(pendingDivs);
            emit RewardsTransferred(account, pendingDivs);
        }
        lastClaimedTime[account] = now;
    }
    
    function getPendingDivs(address _holder) public view returns (uint) {
        if (!holders.contains(_holder)) return 0;
        if (depositedTokens[_holder] == 0) return 0;

        uint timeDiff = now.sub(lastClaimedTime[_holder]);
        uint stakedAmount = depositedTokens[_holder];
        
        uint pendingDivs = stakedAmount
                            .mul(rewardRate)
                            .mul(timeDiff)
                            .div(rewardInterval)
                            .div(36e3);
            
        return pendingDivs;
    }
    
    function getNumberOfHolders() public view returns (uint) {
        return holders.length();
    }
    
    
    function deposit(uint amountToStake) public {
        require(amountToStake > 0, "Cannot deposit 0 Tokens");
        require(Token(tokenAddress).transferFrom(msg.sender, address(this), amountToStake), "Insufficient Token Allowance");
        
        updateAccount(msg.sender);
        
        uint burnedAmount = amountToStake.div(1e2).mul(5);
        uint actualAmount = amountToStake.sub(burnedAmount);
        uint fee = actualAmount.mul(stakingFeeRate).div(1e4);
        uint amountAfterFee = actualAmount.sub(fee);
        require(Token(tokenAddress).transfer(owner, fee), "Could not transfer deposit fee.");
        
        depositedTokens[msg.sender] = depositedTokens[msg.sender].add(amountAfterFee);
        
        if (!holders.contains(msg.sender)) {
            holders.add(msg.sender);
            stakingTime[msg.sender] = now;
        }
    }
    
    function withdraw(uint amountToWithdraw) public {
        require(depositedTokens[msg.sender] >= amountToWithdraw, "Invalid amount to withdraw");
        
        require(now.sub(stakingTime[msg.sender]) > unstakeTime, "You recently staked, please wait before withdrawing.");
        
        updateAccount(msg.sender);
        
        uint fee = amountToWithdraw.mul(unstakingFeeRate).div(1e4);
        uint amountAfterFee = amountToWithdraw.sub(fee);
        
        require(Token(tokenAddress).transfer(owner, fee), "Could not transfer withdraw fee.");
        require(Token(tokenAddress).transfer(msg.sender, amountAfterFee), "Could not transfer tokens.");
        
        depositedTokens[msg.sender] = depositedTokens[msg.sender].sub(amountToWithdraw);
        
        if (holders.contains(msg.sender) && depositedTokens[msg.sender] == 0) {
            holders.remove(msg.sender);
        }
    }
    
    function claimDivs() public {
        updateAccount(msg.sender);
    }
    
    
    uint private constant stakingAndCarrots = 1e25; //PoolSuplly generated from zero address
    
    function getStakingAndDAOAmount() public view returns (uint) {
        if (totalClaimedRewards >= stakingAndCarrots) {
            return 0;
        }
        uint remaining = stakingAndCarrots.sub(totalClaimedRewards);
        return remaining;
    }
      // function to allow admin to claim *other* ERC20 tokens sent to this contract (by mistake)
    function transferAnyERC20Tokens(address _tokenAddr, address _to, uint _amount) public onlyOwner {
        if (_tokenAddr == tokenAddress) {
            if (_amount > getStakingAndDAOAmount()) {
                revert();
            }
            totalClaimedRewards = totalClaimedRewards.add(_amount);
        }
        Token(_tokenAddr).transfer(_to, _amount);
    }
  
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"holder","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"RewardsTransferred","type":"event"},{"inputs":[],"name":"claimDivs","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountToStake","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"depositedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getNumberOfHolders","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_holder","type":"address"}],"name":"getPendingDivs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getStakingAndDAOAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastClaimedTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardInterval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingFeeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"stakingTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalClaimedRewards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"totalEarnedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenAddr","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"transferAnyERC20Tokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unstakeTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unstakingFeeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountToWithdraw","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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