Cryo Explorer Ethereum Mainnet

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/* ROOTKIT:
Provides ownerOnly() modifier
Allows for ownership transfer but requires the new
owner to claim (accept) ownership
Safer because no accidental transfers or renouncing
*/

import "./IOwned.sol";

abstract contract Owned is IOwned
{
    address public override owner = msg.sender;
    address internal pendingOwner;

    modifier ownerOnly()
    {
        require (msg.sender == owner, "Owner only");
        _;
    }

    function transferOwnership(address newOwner) public override ownerOnly()
    {
        pendingOwner = newOwner;
    }

    function claimOwnership() public override
    {
        require (pendingOwner == msg.sender);
        pendingOwner = address(0);
        emit OwnershipTransferred(owner, msg.sender);
        owner = msg.sender;
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

interface IERC20 
{
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function totalSupply() external view returns (uint256);
    function balanceOf(address _account) external view returns (uint256);
    function transfer(address _recipient, uint256 _amount) external returns (bool);
    function allowance(address _owner, address _spender) external view returns (uint256);
    function approve(address _spender, uint256 _amount) external returns (bool);
    function transferFrom(address _sender, address _recipient, uint256 _amount) external returns (bool);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

interface IOwned
{
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    function owner() external view returns (address);

    function transferOwnership(address newOwner) external;
    function claimOwnership() external;
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/* ROOTKIT:
O wherefore art thou 8 point O
*/

library SafeMath 
{
    function add(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) 
    {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }
    
    function div(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) 
    {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) 
    {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/* ROOTKIT:
Modified to remove some junk
Also modified to remove silly restrictions (traps!) within safeApprove
*/

import "./IERC20.sol";
import "./SafeMath.sol";
import "./Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {        
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/* ROOTKIT:
From https://raw.githubusercontent.com/sushiswap/sushiswap/master/contracts/MasterChef.sol
Except a million times better
*/

import "./Owned.sol";
import "./TokensRecoverable.sol";
import "./IERC20.sol";
import "./SafeMath.sol";
import "./SafeERC20.sol";

contract RootKitStaking is Owned, TokensRecoverable
{
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    event Deposit(address indexed user, uint256 indexed poolId, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed poolId, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed poolId, uint256 amount);
    event Emergency();

    struct UserInfo 
    {
        uint256 amountStaked;
        uint256 rewardDebt;
    }

    struct PoolInfo 
    {
        IERC20 token;
        uint256 allocationPoints;
        uint256 lastTotalReward;
        uint256 accRewardPerShare;
    }

    IERC20 public immutable rewardToken;

    PoolInfo[] public poolInfo;
    mapping (uint256 => mapping (address => UserInfo)) public userInfo;
    uint256 public totalAllocationPoints;

    mapping (IERC20 => bool) existingPools;
    uint256 constant maxPoolCount = 20; // to simplify things and ensure massUpdatePools is safe
    uint256 totalReward;
    uint256 lastRewardBalance;

    uint256 public emergencyRecoveryTimestamp;

    constructor(IERC20 _rewardToken)
    {
        rewardToken = _rewardToken;
    }

    function poolInfoCount() external view returns (uint256) 
    {
        return poolInfo.length;
    }

    function addPool(uint256 _allocationPoints, IERC20 _token) public ownerOnly()
    {
        require (address(_token) != address(0) && _token != rewardToken && emergencyRecoveryTimestamp == 0);
        require (!existingPools[_token], "Pool exists");
        require (poolInfo.length < maxPoolCount, "Too many pools");
        existingPools[_token] = true;
        massUpdatePools();
        totalAllocationPoints = totalAllocationPoints.add(_allocationPoints);
        poolInfo.push(PoolInfo({
            token: _token,
            allocationPoints: _allocationPoints,
            lastTotalReward: totalReward,
            accRewardPerShare: 0
        }));
    }

    function setPoolAllocationPoints(uint256 _poolId, uint256 _allocationPoints) public ownerOnly()
    {
        require (emergencyRecoveryTimestamp == 0);
        massUpdatePools();
        totalAllocationPoints = totalAllocationPoints.sub(poolInfo[_poolId].allocationPoints).add(_allocationPoints);
        poolInfo[_poolId].allocationPoints = _allocationPoints;
    }

    function pendingReward(uint256 _poolId, address _user) external view returns (uint256) 
    {
        PoolInfo storage pool = poolInfo[_poolId];
        UserInfo storage user = userInfo[_poolId][_user];
        uint256 accRewardPerShare = pool.accRewardPerShare;
        uint256 supply = pool.token.balanceOf(address(this));
        uint256 balance = rewardToken.balanceOf(address(this));
        uint256 _totalReward = totalReward;
        if (balance > lastRewardBalance) {
            _totalReward = _totalReward.add(balance.sub(lastRewardBalance));
        }
        if (_totalReward > pool.lastTotalReward && supply != 0) {
            uint256 reward = _totalReward.sub(pool.lastTotalReward).mul(pool.allocationPoints).div(totalAllocationPoints);
            accRewardPerShare = accRewardPerShare.add(reward.mul(1e12).div(supply));
        }
        return user.amountStaked.mul(accRewardPerShare).div(1e12).sub(user.rewardDebt);
    }

    function massUpdatePools() public 
    {
        uint256 length = poolInfo.length;
        for (uint256 poolId = 0; poolId < length; ++poolId) {
            updatePool(poolId);
        }
    }

    function updatePool(uint256 _poolId) public 
    {
        PoolInfo storage pool = poolInfo[_poolId];
        uint256 rewardBalance = rewardToken.balanceOf(address(this));
        if (pool.lastTotalReward == rewardBalance) {
            return;
        }
        uint256 _totalReward = totalReward.add(rewardBalance.sub(lastRewardBalance));
        lastRewardBalance = rewardBalance;
        totalReward = _totalReward;
        uint256 supply = pool.token.balanceOf(address(this));
        if (supply == 0) {
            pool.lastTotalReward = _totalReward;
            return;
        }
        uint256 reward = _totalReward.sub(pool.lastTotalReward).mul(pool.allocationPoints).div(totalAllocationPoints);
        pool.accRewardPerShare = pool.accRewardPerShare.add(reward.mul(1e12).div(supply));
        pool.lastTotalReward = _totalReward;
    }

    function deposit(uint256 _poolId, uint256 _amount) public 
    {
        require (emergencyRecoveryTimestamp == 0, "Withdraw only");
        PoolInfo storage pool = poolInfo[_poolId];
        UserInfo storage user = userInfo[_poolId][msg.sender];
        updatePool(_poolId);
        if (user.amountStaked > 0) {
            uint256 pending = user.amountStaked.mul(pool.accRewardPerShare).div(1e12).sub(user.rewardDebt);
            if (pending > 0) {
                safeRewardTransfer(msg.sender, pending);                
            }
        }
        if (_amount > 0) {
            pool.token.safeTransferFrom(address(msg.sender), address(this), _amount);
            user.amountStaked = user.amountStaked.add(_amount);
        }
        user.rewardDebt = user.amountStaked.mul(pool.accRewardPerShare).div(1e12);
        emit Deposit(msg.sender, _poolId, _amount);
    }

    function withdraw(uint256 _poolId, uint256 _amount) public 
    {
        PoolInfo storage pool = poolInfo[_poolId];
        UserInfo storage user = userInfo[_poolId][msg.sender];
        require(user.amountStaked >= _amount, "Amount more than staked");
        updatePool(_poolId);
        uint256 pending = user.amountStaked.mul(pool.accRewardPerShare).div(1e12).sub(user.rewardDebt);
        if (pending > 0) {
            safeRewardTransfer(msg.sender, pending);
        }
        if (_amount > 0) {
            user.amountStaked = user.amountStaked.sub(_amount);
            pool.token.safeTransfer(address(msg.sender), _amount);
        }
        user.rewardDebt = user.amountStaked.mul(pool.accRewardPerShare).div(1e12);
        emit Withdraw(msg.sender, _poolId, _amount);
    }

    function emergencyWithdraw(uint256 _poolId) public 
    {
        PoolInfo storage pool = poolInfo[_poolId];
        UserInfo storage user = userInfo[_poolId][msg.sender];
        uint256 amount = user.amountStaked;
        user.amountStaked = 0;
        user.rewardDebt = 0;
        pool.token.safeTransfer(address(msg.sender), amount);
        emit EmergencyWithdraw(msg.sender, _poolId, amount);
    }

    function safeRewardTransfer(address _to, uint256 _amount) internal 
    {
        uint256 balance = rewardToken.balanceOf(address(this));
        rewardToken.safeTransfer(_to, _amount > balance ? balance : _amount);
        lastRewardBalance = rewardToken.balanceOf(address(this));
    }

    function declareEmergency() public ownerOnly() 
    {
        // Funds will be recoverable 3 days after an emergency is declared
        // By then, everyone should have withdrawn whatever they can
        // Failing that (which is probably why there's an emergency) we can recover for them
        emergencyRecoveryTimestamp = block.timestamp + 60*60*24*3;
        emit Emergency();
    }

    function canRecoverTokens(IERC20 token) internal override view returns (bool) 
    { 
        if (emergencyRecoveryTimestamp != 0 && block.timestamp > emergencyRecoveryTimestamp) {
            return true;
        }
        else {
            return token != rewardToken && !existingPools[token];
        }
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

/* ROOTKIT:
Allows recovery of unexpected tokens (airdrops, etc)
Inheriters can customize logic by overriding canRecoverTokens
*/

import "./IERC20.sol";
import "./SafeERC20.sol";
import "./Owned.sol";
import "./ITokensRecoverable.sol";

abstract contract TokensRecoverable is Owned, ITokensRecoverable
{
    using SafeERC20 for IERC20;

    function recoverTokens(IERC20 token) public override ownerOnly() 
    {
        require (canRecoverTokens(token));
        token.safeTransfer(msg.sender, token.balanceOf(address(this)));
    }

    function canRecoverTokens(IERC20 token) internal virtual view returns (bool) 
    { 
        return address(token) != address(this); 
    }
}

// SPDX-License-Identifier: J-J-J-JENGA!!!
pragma solidity ^0.7.4;

import "./IERC20.sol";

interface ITokensRecoverable
{
    function recoverTokens(IERC20 token) external;
}