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pragma solidity ^0.5.16;

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity 0.6.11;

import "openzeppelin-solidity-2.3.0/contracts/math/Math.sol";

import "openzeppelin-solidity-2.3.0/contracts/math/SafeMath.sol";

import "openzeppelin-solidity-2.3.0/contracts/token/ERC20/ERC20Detailed.sol";

import "openzeppelin-solidity-2.3.0/contracts/token/ERC20/SafeERC20.sol";

import "openzeppelin-solidity-2.3.0/contracts/utils/ReentrancyGuard.sol";

// Inheritance

import "lib/openzeppelin-contracts/contracts/access/Ownable.sol";

import "./interfaces/IStakingRewards.sol";

import "lib/openzeppelin-contracts/contracts/math/Math.sol";

import "./RewardsDistributionRecipient.sol";

import "lib/openzeppelin-contracts/contracts/math/SafeMath.sol";

import "./Pausable.sol";

import "lib/openzeppelin-contracts/contracts/token/ERC20/SafeERC20.sol";

import "./interfaces/IERC2258.sol";

// https://docs.synthetix.io/contracts/source/contracts/stakingrewards

contract StakingRewards is IStakingRewards, RewardsDistributionRecipient, ReentrancyGuard, Pausable {

/// @title MplRewards Synthetix farming contract fork for liquidity mining.

using SafeMath for uint256;

contract MplRewards is Ownable {

using SafeMath for uint256;

using SafeERC20 for IERC20;

/* ========== STATE VARIABLES ========== */

IERC20 public immutable rewardsToken;

IERC2258 public immutable stakingToken;

IERC20 public rewardsToken;

uint256 public periodFinish;

IERC20 public stakingToken;

uint256 public rewardRate;

uint256 public periodFinish = 0;

uint256 public rewardsDuration;

uint256 public rewardRate = 0;

uint256 public rewardsDuration = 7 days;

uint256 public lastUpdateTime;

uint256 public rewardPerTokenStored;

uint256 public lastPauseTime;

bool public paused;

mapping(address => uint256) public userRewardPerTokenPaid;

mapping(address => uint256) public rewards;

uint256 private _totalSupply;

mapping(address => uint256) private _balances;

/* ========== CONSTRUCTOR ========== */

event RewardAdded(uint256 reward);

event Staked(address indexed account, uint256 amount);

event Withdrawn(address indexed account, uint256 amount);

event RewardPaid(address indexed account, uint256 reward);

event RewardsDurationUpdated(uint256 newDuration);

event Recovered(address token, uint256 amount);

event PauseChanged(bool isPaused);

constructor(

constructor(address _rewardsToken, address _stakingToken, address _owner) public {

address _owner,

rewardsToken = IERC20(_rewardsToken);

address _rewardsDistribution,

stakingToken = IERC2258(_stakingToken);

address _rewardsToken,

rewardsDuration = 7 days;

address _stakingToken

transferOwnership(_owner);

) public Owned(_owner) {

rewardsToken = IERC20(_rewardsToken);

stakingToken = IERC20(_stakingToken);

rewardsDistribution = _rewardsDistribution;

}

/* ========== VIEWS ========== */

function _updateReward(address account) internal {

uint256 _rewardPerTokenStored = rewardPerToken();

rewardPerTokenStored = _rewardPerTokenStored;

lastUpdateTime = lastTimeRewardApplicable();

if (account != address(0)) {

rewards[account] = earned(account);

userRewardPerTokenPaid[account] = _rewardPerTokenStored;

}

function _notPaused() internal view {

require(!paused, "R:PAUSED");

}

function totalSupply() external view returns (uint256) {

return _totalSupply;

}

function balanceOf(address account) external view returns (uint256) {

return _balances[account];

}

function lastTimeRewardApplicable() public view returns (uint256) {

return Math.min(block.timestamp, periodFinish);

}

function rewardPerToken() public view returns (uint256) {

if (_totalSupply == 0) {

return _totalSupply == 0

return rewardPerTokenStored;

? rewardPerTokenStored

}

: rewardPerTokenStored.add(

return

lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)

rewardPerTokenStored.add(

);

lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)

);

}

function earned(address account) public view returns (uint256) {

return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);

}

function getRewardForDuration() external view returns (uint256) {

return rewardRate.mul(rewardsDuration);

}

/* ========== MUTATIVE FUNCTIONS ========== */

/**

@dev It emits a `Staked` event.

function stake(uint256 amount) external nonReentrant notPaused updateReward(msg.sender) {

require(amount > 0, "Cannot stake 0");

function stake(uint256 amount) external {

_totalSupply = _totalSupply.add(amount);

_notPaused();

_balances[msg.sender] = _balances[msg.sender].add(amount);

_updateReward(msg.sender);

stakingToken.safeTransferFrom(msg.sender, address(this), amount);

uint256 newBalance = _balances[msg.sender].add(amount);

require(amount > 0, "R:ZERO_STAKE");

require(stakingToken.custodyAllowance(msg.sender, address(this)) >= newBalance, "R:INSUF_CUST_ALLOWANCE");

_totalSupply = _totalSupply.add(amount);

_balances[msg.sender] = newBalance;

emit Staked(msg.sender, amount);

}

function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {

/**

require(amount > 0, "Cannot withdraw 0");

@dev It emits a `Withdrawn` event.

function withdraw(uint256 amount) public {

_notPaused();

_updateReward(msg.sender);

require(amount > 0, "R:ZERO_WITHDRAW");

_totalSupply = _totalSupply.sub(amount);

_balances[msg.sender] = _balances[msg.sender].sub(amount);

stakingToken.safeTransfer(msg.sender, amount);

stakingToken.transferByCustodian(msg.sender, msg.sender, amount);

emit Withdrawn(msg.sender, amount);

}

function getReward() public nonReentrant updateReward(msg.sender) {

/**

@dev It emits a `RewardPaid` event if any rewards are received.

function getReward() public {

_notPaused();

_updateReward(msg.sender);

uint256 reward = rewards[msg.sender];

if (reward > 0) {

rewards[msg.sender] = 0;

if (reward == uint256(0)) return;

rewardsToken.safeTransfer(msg.sender, reward);

emit RewardPaid(msg.sender, reward);

rewards[msg.sender] = uint256(0);

}

rewardsToken.safeTransfer(msg.sender, reward);

emit RewardPaid(msg.sender, reward);

}

function exit() external {

withdraw(_balances[msg.sender]);

getReward();

}

/* ========== RESTRICTED FUNCTIONS ========== */

/**

@dev Only the contract Owner may call this.

@dev It emits a `RewardAdded` event.

function notifyRewardAmount(uint256 reward) external onlyOwner {

_updateReward(address(0));

function notifyRewardAmount(uint256 reward) external onlyRewardsDistribution updateReward(address(0)) {

uint256 _rewardRate = block.timestamp >= periodFinish

if (block.timestamp >= periodFinish) {

? reward.div(rewardsDuration)

rewardRate = reward.div(rewardsDuration);

: reward.add(

} else {

periodFinish.sub(block.timestamp).mul(rewardRate)

uint256 remaining = periodFinish.sub(block.timestamp);

).div(rewardsDuration);

uint256 leftover = remaining.mul(rewardRate);

rewardRate = reward.add(leftover).div(rewardsDuration);

rewardRate = _rewardRate;

}

// Ensure the provided reward amount is not more than the balance in the contract.

// This keeps the reward rate in the right range, preventing overflows due to

// very high values of rewardRate in the earned and rewardsPerToken functions;

// Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.

uint balance = rewardsToken.balanceOf(address(this));

uint256 balance = rewardsToken.balanceOf(address(this));

require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

require(_rewardRate <= balance.div(rewardsDuration), "R:REWARD_TOO_HIGH");

lastUpdateTime = block.timestamp;

periodFinish = block.timestamp.add(rewardsDuration);

emit RewardAdded(reward);

}

// End rewards emission earlier

/**

function updatePeriodFinish(uint timestamp) external onlyOwner updateReward(address(0)) {

@dev End rewards emission earlier. Only the contract Owner may call this.

function updatePeriodFinish(uint256 timestamp) external onlyOwner {

_updateReward(address(0));

periodFinish = timestamp;

}

// Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders

/**

@dev Added to support recovering tokens unintentionally sent to this contract.

Only the contract Owner may call this.

@dev It emits a `Recovered` event.

function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {

require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token");

IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);

IERC20(tokenAddress).safeTransfer(owner, tokenAmount);

emit Recovered(tokenAddress, tokenAmount);

}

/**

@dev Only the contract Owner may call this.

@dev It emits a `RewardsDurationUpdated` event.

function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {

require(

require(block.timestamp > periodFinish, "R:PERIOD_NOT_FINISHED");

block.timestamp > periodFinish,

"Previous rewards period must be complete before changing the duration for the new period"

);

rewardsDuration = _rewardsDuration;

emit RewardsDurationUpdated(rewardsDuration);

}

/* ========== MODIFIERS ========== */

/**

@dev Change the paused state of the contract. Only the contract Owner may call this.

@dev It emits a `PauseChanged` event.

function setPaused(bool _paused) external onlyOwner {

// Ensure we're actually changing the state before we do anything

require(_paused != paused, "R:ALREADY_SET");

modifier updateReward(address account) {

// Set our paused state.

rewardPerTokenStored = rewardPerToken();

paused = _paused;

lastUpdateTime = lastTimeRewardApplicable();

if (account != address(0)) {

// If applicable, set the last pause time.

rewards[account] = earned(account);

if (_paused) lastPauseTime = block.timestamp;

userRewardPerTokenPaid[account] = rewardPerTokenStored;

}

// Let everyone know that our pause state has changed.

emit PauseChanged(paused);

}

/* ========== EVENTS ========== */

event RewardAdded(uint256 reward);

event Staked(address indexed user, uint256 amount);

event Withdrawn(address indexed user, uint256 amount);

event RewardPaid(address indexed user, uint256 reward);

event RewardsDurationUpdated(uint256 newDuration);

event Recovered(address token, uint256 amount);

}

{"mode":"full","isActive":false}

已保存差異

原始文本

開啟檔案

pragma solidity ^0.5.16;

import "openzeppelin-solidity-2.3.0/contracts/math/Math.sol";
import "openzeppelin-solidity-2.3.0/contracts/math/SafeMath.sol";
import "openzeppelin-solidity-2.3.0/contracts/token/ERC20/ERC20Detailed.sol";
import "openzeppelin-solidity-2.3.0/contracts/token/ERC20/SafeERC20.sol";
import "openzeppelin-solidity-2.3.0/contracts/utils/ReentrancyGuard.sol";

// Inheritance
import "./interfaces/IStakingRewards.sol";
import "./RewardsDistributionRecipient.sol";
import "./Pausable.sol";

// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
contract StakingRewards is IStakingRewards, RewardsDistributionRecipient, ReentrancyGuard, Pausable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

/* ========== STATE VARIABLES ========== */

IERC20 public rewardsToken;
    IERC20 public stakingToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 7 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

/* ========== CONSTRUCTOR ========== */

constructor(
        address _owner,
        address _rewardsDistribution,
        address _rewardsToken,
        address _stakingToken
    ) public Owned(_owner) {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
        rewardsDistribution = _rewardsDistribution;
    }

/* ========== VIEWS ========== */

function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

function rewardPerToken() public view returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
            );
    }

function earned(address account) public view returns (uint256) {
        return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
    }

function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

/* ========== MUTATIVE FUNCTIONS ========== */

function stake(uint256 amount) external nonReentrant notPaused updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

function withdraw(uint256 amount) public nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

function getReward() public nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

/* ========== RESTRICTED FUNCTIONS ========== */

function notifyRewardAmount(uint256 reward) external onlyRewardsDistribution updateReward(address(0)) {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

// Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint balance = rewardsToken.balanceOf(address(this));
        require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

// End rewards emission earlier
    function updatePeriodFinish(uint timestamp) external onlyOwner updateReward(address(0)) {
        periodFinish = timestamp;
    }

// Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token");
        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

/* ========== MODIFIERS ========== */

modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

/* ========== EVENTS ========== */

event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event Recovered(address token, uint256 amount);
}

更改後文本

開啟檔案

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.6.11;

import "lib/openzeppelin-contracts/contracts/access/Ownable.sol";
import "lib/openzeppelin-contracts/contracts/math/Math.sol";
import "lib/openzeppelin-contracts/contracts/math/SafeMath.sol";
import "lib/openzeppelin-contracts/contracts/token/ERC20/SafeERC20.sol";

import "./interfaces/IERC2258.sol";

// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
/// @title MplRewards Synthetix farming contract fork for liquidity mining.
contract MplRewards is Ownable {

using SafeMath  for uint256;
    using SafeERC20 for IERC20;

IERC20    public immutable rewardsToken;
    IERC2258  public immutable stakingToken;

uint256 public periodFinish;
    uint256 public rewardRate;
    uint256 public rewardsDuration;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;
    uint256 public lastPauseTime;
    bool    public paused;

mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

uint256 private _totalSupply;

mapping(address => uint256) private _balances;

event            RewardAdded(uint256 reward);
    event                 Staked(address indexed account, uint256 amount);
    event              Withdrawn(address indexed account, uint256 amount);
    event             RewardPaid(address indexed account, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event              Recovered(address token, uint256 amount);
    event           PauseChanged(bool isPaused);

constructor(address _rewardsToken, address _stakingToken, address _owner) public {
        rewardsToken    = IERC20(_rewardsToken);
        stakingToken    = IERC2258(_stakingToken);
        rewardsDuration = 7 days;
        transferOwnership(_owner);
    }

function _updateReward(address account) internal {
        uint256 _rewardPerTokenStored = rewardPerToken();
        rewardPerTokenStored          = _rewardPerTokenStored;
        lastUpdateTime                = lastTimeRewardApplicable();

if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = _rewardPerTokenStored;
        }
    }

function _notPaused() internal view {
        require(!paused, "R:PAUSED");
    }

function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

function balanceOf(address account) external view returns (uint256) {
        return _balances[account];
    }

function lastTimeRewardApplicable() public view returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

function rewardPerToken() public view returns (uint256) {
        return _totalSupply == 0
            ? rewardPerTokenStored
            : rewardPerTokenStored.add(
                  lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
              );
    }

function earned(address account) public view returns (uint256) {
        return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
    }

function getRewardForDuration() external view returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

/**
        @dev It emits a `Staked` event.
    */
    function stake(uint256 amount) external {
        _notPaused();
        _updateReward(msg.sender);
        uint256 newBalance = _balances[msg.sender].add(amount);
        require(amount > 0, "R:ZERO_STAKE");
        require(stakingToken.custodyAllowance(msg.sender, address(this)) >= newBalance, "R:INSUF_CUST_ALLOWANCE");
        _totalSupply          = _totalSupply.add(amount);
        _balances[msg.sender] = newBalance;
        emit Staked(msg.sender, amount);
    }

/**
        @dev It emits a `Withdrawn` event.
    */
    function withdraw(uint256 amount) public {
        _notPaused();
        _updateReward(msg.sender);
        require(amount > 0, "R:ZERO_WITHDRAW");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.transferByCustodian(msg.sender, msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

/**
        @dev It emits a `RewardPaid` event if any rewards are received.
    */
    function getReward() public {
        _notPaused();
        _updateReward(msg.sender);
        uint256 reward = rewards[msg.sender];

if (reward == uint256(0)) return;

rewards[msg.sender] = uint256(0);
        rewardsToken.safeTransfer(msg.sender, reward);
        emit RewardPaid(msg.sender, reward);
    }

function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

/**
        @dev Only the contract Owner may call this.
        @dev It emits a `RewardAdded` event.
    */
    function notifyRewardAmount(uint256 reward) external onlyOwner {
        _updateReward(address(0));

uint256 _rewardRate = block.timestamp >= periodFinish
            ? reward.div(rewardsDuration)
            : reward.add(
                  periodFinish.sub(block.timestamp).mul(rewardRate)
              ).div(rewardsDuration);

rewardRate = _rewardRate;

// Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint256 balance = rewardsToken.balanceOf(address(this));
        require(_rewardRate <= balance.div(rewardsDuration), "R:REWARD_TOO_HIGH");

lastUpdateTime = block.timestamp;
        periodFinish   = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

/**
        @dev End rewards emission earlier. Only the contract Owner may call this.
    */
    function updatePeriodFinish(uint256 timestamp) external onlyOwner {
        _updateReward(address(0));
        periodFinish = timestamp;
    }

/**
        @dev Added to support recovering tokens unintentionally sent to this contract.
             Only the contract Owner may call this.
        @dev It emits a `Recovered` event.
    */
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        IERC20(tokenAddress).safeTransfer(owner(), tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

/**
        @dev Only the contract Owner may call this.
        @dev It emits a `RewardsDurationUpdated` event.
    */
    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(block.timestamp > periodFinish, "R:PERIOD_NOT_FINISHED");
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

/**
        @dev Change the paused state of the contract. Only the contract Owner may call this.
        @dev It emits a `PauseChanged` event.
    */
    function setPaused(bool _paused) external onlyOwner {
        // Ensure we're actually changing the state before we do anything
        require(_paused != paused, "R:ALREADY_SET");

// Set our paused state.
        paused = _paused;

// If applicable, set the last pause time.
        if (_paused) lastPauseTime = block.timestamp;

// Let everyone know that our pause state has changed.
        emit PauseChanged(paused);
    }

}
{"mode":"full","isActive":false}