Contract 0x1227a55a86aca0331e450ba6a3750054da35347d

Txn Hash Method
Block
From
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Value [Txn Fee]
0x192b731c673846c940dc277d29e37bf16ae4b1adaac2f5a2071d9a36db910de3Withdraw145578732022-05-11 14:24:589 days 16 hrs ago0xba8e220834c32fac376bbfb33820c001f022d72e IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.047546679846 221.045564352
0x7d7961a6f55a5317fbcae2cacb27068cb9deb3f29ea793d6e5545dfc0da5e68dWithdraw144263592022-05-08 11:53:0812 days 18 hrs ago0x1e01cb867933b3dae107d7d1dd166036f4e02ab6 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.013489745077 62.714122695
0x2222e31f2ef4f69350c69556e769922a76a2dc0dcdb4d0cc17b9ef728bebde82Withdraw142751572022-05-04 20:29:5916 days 10 hrs ago0x3d6ac454fd3ca71e11386ce491483ab5d52005af IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.022244572297 103.415507729
0x5154a33e9b2c1e351e4369f52285ced42640e86048492c9e5babe2437406d1f6Withdraw140095332022-04-28 12:41:4822 days 18 hrs ago0xf56036f6a5d9b9991c209dcbc9c40b2c1cd46540 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.013215290942 61.43817936
0x37ad63ff7fe8d37e87ebdfb61fed43ee3039cfbf0d76500e024a3c8c41d391e4Reinvest140027952022-04-28 8:54:3822 days 21 hrs ago0xdc4034ce91ed4e8fa10530790394c47c85d3ef34 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.02292401168 48.034556366
0xbeef8bbf59a203741983763602efe01a8f326d6086a1d83e999db47fd32583beWithdraw135272552022-04-17 6:32:4334 days 10 mins ago0x4c82d65e0445a4745789528e310b0d4ec4474f4f IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.006962376775 32.368243348
0x4ab9b72b81040f584f680504218b26f1881c17efc6edbeaf7d9159bbabee0182Withdraw134558632022-04-15 15:09:2935 days 15 hrs ago0x203ec061123148869b0bb2b555890a05b44c0af5 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.023537323599 109.431642079
0xa4e1da8e24a2a514b404f38d67c73bb30f5891a470d40c1fa9c89cbbe12591dcWithdraw133436972022-04-13 0:26:2138 days 6 hrs ago0x7e744b70a3bc965a5c127ad63a98aa2393466984 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.026091396648 121.29947907
0x86a64a18765238e5358a0f1bbdd26f944b849586e0c0c13685c8290c14d390ceWithdraw130594192022-04-06 8:41:3344 days 22 hrs ago0x00411f4ab92f631a36547da575b5cc5df42e3a44 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.005962824726 27.722850414
0xe4e286d7855516c14f4174d972b492834f456d1b97b2acb2f9e87b6b5d84327aWithdraw130465272022-04-06 1:28:0445 days 5 hrs ago0x993c17f8c997662692028edf1655ad781c8b3a8c IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.014585515205 67.815948882
0xe90b6c8d711fc1c506a1459b08b428bf04ab03b79af8aad02024b8e350c412caWithdraw130422352022-04-05 23:03:5045 days 7 hrs ago0x21de646963b5a3ba6d88396d7d68f3a05f44a709 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.010856840273 50.47650613
0xbb237a092f26287f3ce4ca928f5f1275b221c0f4163506fbdb975a63acf7ee83Withdraw130373392022-04-05 20:17:5845 days 10 hrs ago0xe17338b2f51a941ca1caeb001b4822386300be48 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.018412793082 85.611033745
0x8394bebd3cc8bc3592389895f1967fd46b94183c681f43b69e69b3b57c7aebf6Withdraw129879302022-04-04 15:23:2846 days 15 hrs ago0x97d6f1d1d3bb0d5f91b4ecf6da23ae816d5181c6 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.024521286114
0x27661920edfb111c34a6ad426348dcd2402b7b632960b572f931d6d3642f8fd2Withdraw129553142022-04-03 20:42:0147 days 10 hrs ago0x04c26be05d8e67af31f8fbe626efd54ac28dd2ab IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.016621714462 77.274717513
0x455161dab95a00e5ae5c0df28e551ff8d17899709e422eac9a27a5038da1370fWithdraw129004772022-04-02 13:26:0448 days 17 hrs ago0x7fb65ef54464366c0ee699cf40c06c0586ea72ca IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.017403915176 80.91570005
0x6cd75368093167c65d4ae2592c7fb2ca33f9a8c5b2fc2f55b20b1d9426b7988dWithdraw128790682022-04-02 1:26:2149 days 5 hrs ago0x344965084f7a032e98ec353961bc5504c458cd74 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.007673769293 35.677513256
0x9b9601bd621036a6a27594e8c88a90536c52d234ee7f826b34a8c4184bdb7cd8Withdraw128743822022-04-01 22:48:4549 days 7 hrs ago0x9d58d3c2918957d06aa12dc8d458986e7f23096d IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.011107174612 51.6375
0x302d0c20e853cc44118dc6392287e4da50ccbefa66d4d32e0e6bb61c516901cfWithdraw128703522022-04-01 20:32:5749 days 10 hrs ago0xb3aeba7fc075debcd37bd6743f1dbc4ffd6babfa IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.01837832308583.27325038
0xec783c3a914eb0e095618011679e6c363bdf749c6756267c908dbf2757e48665Withdraw128169872022-03-31 14:24:4850 days 16 hrs ago0xee22b9596953b0705bb2dd6d598a07ef708d815d IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.032490251873 138.267570031
0xc6bc6509de35048e5b7e71e60d9991c97739713e6a10f0551d4263f6f8fc8db0Withdraw127615912022-03-30 7:10:5351 days 23 hrs ago0xded36f89894b01e5aa973f67291424753fcabfe8 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.0062269965 26.5
0xe709acd790a042d3a34b60c639b9812c6c56e1e3b1fb69be68ba2a3274e7c6ddDeposit127334422022-03-29 15:18:1152 days 15 hrs ago0x97d6f1d1d3bb0d5f91b4ecf6da23ae816d5181c6 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.0221178690
0xd6906b176527f1989120cba80646a6ea37f35c26e58a5888744996107ee55894Withdraw127283172022-03-29 12:23:3952 days 18 hrs ago0x97d6f1d1d3bb0d5f91b4ecf6da23ae816d5181c6 IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.01109209244
0xfa8d56f5b8ff0ab71a5fc83de9abc2feb340fcb7f95b3e9da2b2161f6aa1f012Reinvest126443232022-03-27 13:02:0654 days 17 hrs ago0xdaa99a4826b3d0e9998cb55c8c648c53a5be677e IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.01364502179 27.591898956
0x3a8660c54ed13855867d28bca24311cd6827cd27854585105a89da8d5794ffbaWithdraw126007732022-03-26 12:29:5455 days 18 hrs ago0xf63d64a17b964abbfa6bff781b6d407108bda99e IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.008641530201 36.775442278
0x6d8213367bf4ebf75b8c00e444decada02879d0ea4339699ba1df57d5df39620Deposit With Per...124822632022-03-23 17:27:2658 days 13 hrs ago0x9d58d3c2918957d06aa12dc8d458986e7f23096d IN  0x1227a55a86aca0331e450ba6a3750054da35347d0 AVAX0.020447970304 64.642692135
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Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x698bceeE246934FbFFDbe222CC4444Ae7585C3cb

Contract Name:
JoeStrategyV3

Compiler Version
v0.7.3+commit.9bfce1f6

Optimization Enabled:
Yes with 999 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 12 : JoeStrategyV3.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "../YakStrategy.sol";
import "../interfaces/IJoeChef.sol";
import "../interfaces/IPair.sol";
import "../interfaces/IWAVAX.sol";
import "../interfaces/IERC20.sol";
import "../lib/DexLibrary.sol";

/**
 * @notice Strategy for Trader Joe, which includes optional and variable extra rewards
 * @dev Fees are paid in WAVAX
 */
contract JoeStrategyV3 is YakStrategy {
    using SafeMath for uint;

    IJoeChef public stakingContract;
    IPair private swapPairWAVAXJoe;
    IPair private swapPairExtraToken;
    IPair private swapPairToken0;
    IPair private swapPairToken1;
    IERC20 private poolRewardToken;
    uint public PID;
    IWAVAX private constant WAVAX = IWAVAX(0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7);

    constructor (
        string memory _name,
        address _depositToken,
        address _poolRewardToken,
        address _rewardToken,
        address _stakingContract,
        address _swapPairWAVAXJoe,
        address _swapPairToken0,
        address _swapPairToken1,
        address _extraTokenSwapPair,
        uint pid,
        address _timelock,
        uint _minTokensToReinvest,
        uint _adminFeeBips,
        uint _devFeeBips,
        uint _reinvestRewardBips
    ) {
        name = _name;
        depositToken = IERC20(_depositToken);
        rewardToken = IERC20(_rewardToken);
        poolRewardToken = IERC20(_poolRewardToken);
        stakingContract = IJoeChef(_stakingContract);
        devAddr = msg.sender;
        PID = pid;

        assignSwapPairSafely(_swapPairWAVAXJoe, _extraTokenSwapPair, _swapPairToken0, _swapPairToken1);
        setAllowances();
        updateMinTokensToReinvest(_minTokensToReinvest);
        updateAdminFee(_adminFeeBips);
        updateDevFee(_devFeeBips);
        updateReinvestReward(_reinvestRewardBips);
        updateDepositsEnabled(true);
        transferOwnership(_timelock);

        emit Reinvest(0, 0);
    }

    /**
     * @notice Initialization helper for Pair deposit tokens
     * @dev Checks that selected Pairs are valid for trading reward tokens
     * @dev Assigns values to swapPairToken0 and swapPairToken1
     */
    function assignSwapPairSafely(address _swapPairWAVAXJoe, address _extraTokenSwapPair, address _swapPairToken0, address _swapPairToken1) private {
        require(
            DexLibrary.checkSwapPairCompatibility(IPair(_swapPairWAVAXJoe), address(WAVAX), address(poolRewardToken)),
            "_swapPairWAVAXJoe is not a WAVAX-Joe pair"
        );
        require(
            _swapPairToken0 == address(0)
            || DexLibrary.checkSwapPairCompatibility(IPair(_swapPairToken0), address(WAVAX), IPair(address(depositToken)).token0()),
            "_swapPairToken0 is not a WAVAX+deposit token0"
        );
        require(
            _swapPairToken1 == address(0)
            || DexLibrary.checkSwapPairCompatibility(IPair(_swapPairToken1), address(WAVAX), IPair(address(depositToken)).token1()),
            "_swapPairToken0 is not a WAVAX+deposit token1"
        );
        ( ,address extraRewardToken, , ) = stakingContract.pendingTokens(PID, address(this));
        require(
            _extraTokenSwapPair == address(0)
            || DexLibrary.checkSwapPairCompatibility(IPair(_extraTokenSwapPair), address(WAVAX), extraRewardToken),
            "_swapPairWAVAXJoe is not a WAVAX-extra reward pair, check stakingContract.pendingTokens"
        );
        // converts Joe to WAVAX
        swapPairWAVAXJoe = IPair(_swapPairWAVAXJoe);
        // converts extra reward to WAVAX
        swapPairExtraToken = IPair(_extraTokenSwapPair);
        // converts WAVAX to pair token0
        swapPairToken0 = IPair(_swapPairToken0);
        // converts WAVAX to pair token1
        swapPairToken1 = IPair(_swapPairToken1);
    }

    function setAllowances() public override onlyOwner {
        depositToken.approve(address(stakingContract), MAX_UINT);
    }

    function deposit(uint amount) external override {
        _deposit(msg.sender, amount);
    }

    function depositWithPermit(uint amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external override {
        depositToken.permit(msg.sender, address(this), amount, deadline, v, r, s);
        _deposit(msg.sender, amount);
    }

    function depositFor(address account, uint amount) external override {
        _deposit(account, amount);
    }

    function _deposit(address account, uint amount) private onlyAllowedDeposits {
        require(DEPOSITS_ENABLED == true, "JoeStrategyV3::_deposit");
        if (MAX_TOKENS_TO_DEPOSIT_WITHOUT_REINVEST > 0) {
            uint unclaimedRewards = checkReward();
            if (unclaimedRewards > MAX_TOKENS_TO_DEPOSIT_WITHOUT_REINVEST) {
                (uint poolTokenAmount, address extraRewardTokenAddress, uint extraRewardTokenAmount, uint rewardTokenAmount) = _checkReward();
                _reinvest(poolTokenAmount, extraRewardTokenAddress, extraRewardTokenAmount, rewardTokenAmount);
            }
        }
        require(depositToken.transferFrom(msg.sender, address(this), amount));
        _stakeDepositTokens(amount);
        _mint(account, getSharesForDepositTokens(amount));
        totalDeposits = totalDeposits.add(amount);
        emit Deposit(account, amount);
    }

    function withdraw(uint amount) external override {
        uint depositTokenAmount = getDepositTokensForShares(amount);
        if (depositTokenAmount > 0) {
            _withdrawDepositTokens(depositTokenAmount);
            _safeTransfer(address(depositToken), msg.sender, depositTokenAmount);
            _burn(msg.sender, amount);
            totalDeposits = totalDeposits.sub(depositTokenAmount);
            emit Withdraw(msg.sender, depositTokenAmount);
        }
    }

    function _withdrawDepositTokens(uint amount) private {
        require(amount > 0, "JoeStrategyV3::_withdrawDepositTokens");
        stakingContract.withdraw(PID, amount);
    }

    function reinvest() external override onlyEOA {
        uint unclaimedRewards = checkReward();
        require(unclaimedRewards >= MIN_TOKENS_TO_REINVEST, "JoeStrategyV3::reinvest");
        (uint poolTokenAmount, address extraRewardTokenAddress, uint extraRewardTokenAmount, uint rewardTokenAmount) = _checkReward();
        _reinvest(poolTokenAmount, extraRewardTokenAddress, extraRewardTokenAmount, rewardTokenAmount);
    }

    function _convertRewardIntoWAVAX(uint pendingJoe, address extraRewardToken, uint pendingExtraReward) private returns (uint) {
        uint convertedAmountWAVAX = 0;

        if (extraRewardToken == address(poolRewardToken)) {
            convertedAmountWAVAX = DexLibrary.swap(
                pendingExtraReward.add(pendingJoe),
                address(poolRewardToken), address(WAVAX),
                swapPairWAVAXJoe
            );
            return convertedAmountWAVAX;
        }

        convertedAmountWAVAX = DexLibrary.swap(
            pendingJoe,
            address(poolRewardToken), address(WAVAX),
            swapPairWAVAXJoe
        );
        if (
            address(swapPairExtraToken) != address(0)
            && pendingExtraReward > 0
            && DexLibrary.checkSwapPairCompatibility(swapPairExtraToken, extraRewardToken, address(WAVAX))
        ) {
            convertedAmountWAVAX = convertedAmountWAVAX.add(
                DexLibrary.swap(pendingExtraReward, extraRewardToken, address(WAVAX), swapPairExtraToken)
            );
        }
        return convertedAmountWAVAX;
    }

    /**
     * @notice Reinvest rewards from staking contract to deposit tokens
     * @dev Reverts if the expected amount of tokens are not returned from `stakingContract`
     */
    function _reinvest(uint _pendingJoe, address _extraRewardToken, uint _pendingExtraToken, uint _pendingWavax) private {
        stakingContract.deposit(PID, 0);
        uint amount = _pendingWavax.add(
            _convertRewardIntoWAVAX(_pendingJoe, _extraRewardToken, _pendingExtraToken)
        );

        uint devFee = amount.mul(DEV_FEE_BIPS).div(BIPS_DIVISOR);
        if (devFee > 0) {
            _safeTransfer(address(WAVAX), devAddr, devFee);
        }

        uint adminFee = amount.mul(ADMIN_FEE_BIPS).div(BIPS_DIVISOR);
        if (adminFee > 0) {
            _safeTransfer(address(WAVAX), owner(), adminFee);
        }

        uint reinvestFee = amount.mul(REINVEST_REWARD_BIPS).div(BIPS_DIVISOR);
        if (reinvestFee > 0) {
            _safeTransfer(address(WAVAX), msg.sender, reinvestFee);
        }

        uint depositTokenAmount = DexLibrary.convertRewardTokensToDepositTokens(
            amount.sub(devFee).sub(adminFee).sub(reinvestFee),
            address(WAVAX),
            address(depositToken),
            swapPairToken0,
            swapPairToken1
        );

        _stakeDepositTokens(depositTokenAmount);
        totalDeposits = totalDeposits.add(depositTokenAmount);

        emit Reinvest(totalDeposits, totalSupply);
    }

    function _stakeDepositTokens(uint amount) private {
        require(amount > 0, "JoeStrategyV3::_stakeDepositTokens");
        stakingContract.deposit(PID, amount);
    }

    /**
     * @notice Safely transfer using an anonymosu ERC20 token
     * @dev Requires token to return true on transfer
     * @param token address
     * @param to recipient address
     * @param value amount
     */
    function _safeTransfer(address token, address to, uint256 value) private {
        require(IERC20(token).transfer(to, value), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function setExtraRewardSwapPair(address swapPair) external onlyDev {
        if (swapPair == address(0)) {
            swapPairExtraToken = IPair(address(0));
            return;
        }

        ( ,address extraRewardToken, , ) = stakingContract.pendingTokens(PID, address(this));
        require(
            DexLibrary.checkSwapPairCompatibility(IPair(swapPair), address(WAVAX), extraRewardToken),
            "_swapPairWAVAXJoe is not a WAVAX-extra reward pair, check stakingContract.pendingTokens"
        );
        swapPairExtraToken = IPair(swapPair);
    }

    function _checkReward() private view returns (uint poolTokenAmount, address extraRewardTokenAddress, uint extraRewardTokenAmount, uint rewardTokenAmount) {
        (uint pendingJoe, address extraRewardToken, , uint pendingExtraToken) = stakingContract.pendingTokens(PID, address(this));
        uint poolRewardBalance = poolRewardToken.balanceOf(address(this));
        uint extraRewardTokenBalance;
        if (extraRewardToken != address(0)) {
            extraRewardTokenBalance = IERC20(extraRewardToken).balanceOf(address(this));
        }
        uint rewardTokenBalance = rewardToken.balanceOf(address(this));
        return (
            poolRewardBalance.add(pendingJoe),
            extraRewardToken,
            extraRewardTokenBalance.add(pendingExtraToken),
            rewardTokenBalance
        );
    }

    function checkReward() public override view returns (uint) {
        (uint poolTokenAmount, address extraRewardTokenAddress, uint extraRewardTokenAmount, uint rewardTokenAmount) = _checkReward();
        uint estimatedWAVAX = DexLibrary.estimateConversionThroughPair(
            poolTokenAmount,
            address(poolRewardToken), address(WAVAX),
            swapPairWAVAXJoe
        );
        if (
            address(swapPairExtraToken) != address(0)
            && extraRewardTokenAmount > 0
            && DexLibrary.checkSwapPairCompatibility(swapPairExtraToken, extraRewardTokenAddress, address(WAVAX))
        ) {
            estimatedWAVAX.add(
                DexLibrary.estimateConversionThroughPair(
                    extraRewardTokenAmount,
                    extraRewardTokenAddress, address(WAVAX),
                    swapPairExtraToken
                )
            );
        }
        return rewardTokenAmount.add(estimatedWAVAX);
    }

    function estimateDeployedBalance() external override view returns (uint) {
        (uint amount, ) = stakingContract.userInfo(PID, address(this));
        return amount;
    }

    /**
    * @notice Allows exit from Staking Contract without additional logic
    * @dev Reward tokens are not automatically collected
    * @dev New deposits will be effectively disabled
    */
    function emergencyWithdraw() external onlyOwner {
        stakingContract.emergencyWithdraw(PID);
        totalDeposits = 0;
    }

    function rescueDeployedFunds(uint minReturnAmountAccepted, bool disableDeposits) external override onlyOwner {
        uint balanceBefore = depositToken.balanceOf(address(this));
        stakingContract.emergencyWithdraw(PID);
        uint balanceAfter = depositToken.balanceOf(address(this));
        require(balanceAfter.sub(balanceBefore) >= minReturnAmountAccepted, "JoeStrategyV3::rescueDeployedFunds");
        totalDeposits = balanceAfter;
        emit Reinvest(totalDeposits, totalSupply);
        if (DEPOSITS_ENABLED == true && disableDeposits == true) {
            updateDepositsEnabled(false);
        }
    }
}

File 2 of 12 : YakStrategy.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./lib/SafeMath.sol";
import "./lib/Ownable.sol";
import "./lib/Permissioned.sol";
import "./interfaces/IERC20.sol";
import "./YakERC20.sol";

/**
 * @notice YakStrategy should be inherited by new strategies
 */
abstract contract YakStrategy is YakERC20, Ownable, Permissioned {
    using SafeMath for uint;

    uint public totalDeposits;

    IERC20 public depositToken;
    IERC20 public rewardToken;
    address public devAddr;

    uint public MIN_TOKENS_TO_REINVEST;
    uint public MAX_TOKENS_TO_DEPOSIT_WITHOUT_REINVEST;
    bool public DEPOSITS_ENABLED;

    uint public REINVEST_REWARD_BIPS;
    uint public ADMIN_FEE_BIPS;
    uint public DEV_FEE_BIPS;

    uint constant internal BIPS_DIVISOR = 10000;
    uint constant internal MAX_UINT = uint(-1);

    event Deposit(address indexed account, uint amount);
    event Withdraw(address indexed account, uint amount);
    event Reinvest(uint newTotalDeposits, uint newTotalSupply);
    event Recovered(address token, uint amount);
    event UpdateAdminFee(uint oldValue, uint newValue);
    event UpdateDevFee(uint oldValue, uint newValue);
    event UpdateReinvestReward(uint oldValue, uint newValue);
    event UpdateMinTokensToReinvest(uint oldValue, uint newValue);
    event UpdateMaxTokensToDepositWithoutReinvest(uint oldValue, uint newValue);
    event UpdateDevAddr(address oldValue, address newValue);
    event DepositsEnabled(bool newValue);

    /**
     * @notice Throws if called by smart contract
     */
    modifier onlyEOA() {
        require(tx.origin == msg.sender, "YakStrategy::onlyEOA");
        _;
    }

    /**
     * @notice Only called by dev
     */
    modifier onlyDev() {
        require(msg.sender == devAddr, "YakStrategy::onlyDev");
        _;
    }

    /**
     * @notice Approve tokens for use in Strategy
     * @dev Should use modifier `onlyOwner` to avoid griefing
     */
    function setAllowances() public virtual;

    /**
     * @notice Revoke token allowance
     * @param token address
     * @param spender address
     */
    function revokeAllowance(address token, address spender) external onlyOwner {
        require(IERC20(token).approve(spender, 0));
    }

    /**
     * @notice Deposit and deploy deposits tokens to the strategy
     * @dev Must mint receipt tokens to `msg.sender`
     * @param amount deposit tokens
     */
    function deposit(uint amount) external virtual;

    /**
    * @notice Deposit using Permit
    * @dev Should revert for tokens without Permit
    * @param amount Amount of tokens to deposit
    * @param deadline The time at which to expire the signature
    * @param v The recovery byte of the signature
    * @param r Half of the ECDSA signature pair
    * @param s Half of the ECDSA signature pair
    */
    function depositWithPermit(uint amount, uint deadline, uint8 v, bytes32 r, bytes32 s) external virtual;

    /**
     * @notice Deposit on behalf of another account
     * @dev Must mint receipt tokens to `account`
     * @param account address to receive receipt tokens
     * @param amount deposit tokens
     */
    function depositFor(address account, uint amount) external virtual;

    /**
     * @notice Redeem receipt tokens for deposit tokens
     * @param amount receipt tokens
     */
    function withdraw(uint amount) external virtual;

    /**
     * @notice Reinvest reward tokens into deposit tokens
     */
    function reinvest() external virtual;

    /**
     * @notice Estimate reinvest reward
     * @return reward tokens
     */
    function estimateReinvestReward() external view returns (uint) {
        uint unclaimedRewards = checkReward();
        if (unclaimedRewards >= MIN_TOKENS_TO_REINVEST) {
            return unclaimedRewards.mul(REINVEST_REWARD_BIPS).div(BIPS_DIVISOR);
        }
        return 0;
    }

    /**
     * @notice Reward tokens avialable to strategy, including balance
     * @return reward tokens
     */
    function checkReward() public virtual view returns (uint);

    /**
     * @notice Estimated deposit token balance deployed by strategy, excluding balance
     * @return deposit tokens
     */
    function estimateDeployedBalance() external virtual view returns (uint);

    /**
     * @notice Rescue all available deployed deposit tokens back to Strategy
     * @param minReturnAmountAccepted min deposit tokens to receive
     * @param disableDeposits bool
     */
    function rescueDeployedFunds(uint minReturnAmountAccepted, bool disableDeposits) external virtual;

    /**
     * @notice Calculate receipt tokens for a given amount of deposit tokens
     * @dev If contract is empty, use 1:1 ratio
     * @dev Could return zero shares for very low amounts of deposit tokens
     * @param amount deposit tokens
     * @return receipt tokens
     */
    function getSharesForDepositTokens(uint amount) public view returns (uint) {
        if (totalSupply.mul(totalDeposits) == 0) {
            return amount;
        }
        return amount.mul(totalSupply).div(totalDeposits);
    }

    /**
     * @notice Calculate deposit tokens for a given amount of receipt tokens
     * @param amount receipt tokens
     * @return deposit tokens
     */
    function getDepositTokensForShares(uint amount) public view returns (uint) {
        if (totalSupply.mul(totalDeposits) == 0) {
            return 0;
        }
        return amount.mul(totalDeposits).div(totalSupply);
    }

    /**
     * @notice Update reinvest min threshold
     * @param newValue threshold
     */
    function updateMinTokensToReinvest(uint newValue) public onlyOwner {
        emit UpdateMinTokensToReinvest(MIN_TOKENS_TO_REINVEST, newValue);
        MIN_TOKENS_TO_REINVEST = newValue;
    }

    /**
     * @notice Update reinvest max threshold before a deposit
     * @param newValue threshold
     */
    function updateMaxTokensToDepositWithoutReinvest(uint newValue) public onlyOwner {
        emit UpdateMaxTokensToDepositWithoutReinvest(MAX_TOKENS_TO_DEPOSIT_WITHOUT_REINVEST, newValue);
        MAX_TOKENS_TO_DEPOSIT_WITHOUT_REINVEST = newValue;
    }

    /**
     * @notice Update developer fee
     * @param newValue fee in BIPS
     */
    function updateDevFee(uint newValue) public onlyOwner {
        require(newValue.add(ADMIN_FEE_BIPS).add(REINVEST_REWARD_BIPS) <= BIPS_DIVISOR);
        emit UpdateDevFee(DEV_FEE_BIPS, newValue);
        DEV_FEE_BIPS = newValue;
    }

    /**
     * @notice Update admin fee
     * @param newValue fee in BIPS
     */
    function updateAdminFee(uint newValue) public onlyOwner {
        require(newValue.add(DEV_FEE_BIPS).add(REINVEST_REWARD_BIPS) <= BIPS_DIVISOR);
        emit UpdateAdminFee(ADMIN_FEE_BIPS, newValue);
        ADMIN_FEE_BIPS = newValue;
    }

    /**
     * @notice Update reinvest reward
     * @param newValue fee in BIPS
     */
    function updateReinvestReward(uint newValue) public onlyOwner {
        require(newValue.add(ADMIN_FEE_BIPS).add(DEV_FEE_BIPS) <= BIPS_DIVISOR);
        emit UpdateReinvestReward(REINVEST_REWARD_BIPS, newValue);
        REINVEST_REWARD_BIPS = newValue;
    }

    /**
     * @notice Enable/disable deposits
     * @param newValue bool
     */
    function updateDepositsEnabled(bool newValue) public onlyOwner {
        require(DEPOSITS_ENABLED != newValue);
        DEPOSITS_ENABLED = newValue;
        emit DepositsEnabled(newValue);
    }

    /**
     * @notice Update devAddr
     * @param newValue address
     */
    function updateDevAddr(address newValue) public onlyDev {
        emit UpdateDevAddr(devAddr, newValue);
        devAddr = newValue;
    }

    /**
     * @notice Recover ERC20 from contract
     * @param tokenAddress token address
     * @param tokenAmount amount to recover
     */
    function recoverERC20(address tokenAddress, uint tokenAmount) external onlyOwner {
        require(tokenAmount > 0);
        require(IERC20(tokenAddress).transfer(msg.sender, tokenAmount));
        emit Recovered(tokenAddress, tokenAmount);
    }

    /**
     * @notice Recover AVAX from contract
     * @param amount amount
     */
    function recoverAVAX(uint amount) external onlyOwner {
        require(amount > 0);
        msg.sender.transfer(amount);
        emit Recovered(address(0), amount);
    }
}

File 3 of 12 : IJoeChef.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface IJoeChef {
    function deposit(uint256 _pid, uint256 _amount) external;

    function withdraw(uint256 _pid, uint256 _amount) external;

    function emergencyWithdraw(uint256 _pid) external;

    function pendingTokens(uint256 _pid, address _user)
        external
        view
        returns (
            uint256 pendingJoe,
            address bonusTokenAddress,
            string memory bonusTokenSymbol,
            uint256 pendingBonusToken
        );

    function userInfo(uint256 pid, address user)
        external
        view
        returns (uint256 amount, uint256 rewardDebt);

    function poolInfo(uint256 pid)
        external
        view
        returns (
            address lpToken,
            uint256 accJoePerShare,
            uint256 lastRewardTimestamp,
            uint256 allocPoint,
            address rewarder
        );
}

File 4 of 12 : IPair.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./IERC20.sol";

interface IPair is IERC20 {
    function token0() external pure returns (address);
    function token1() external pure returns (address);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function mint(address to) external returns (uint liquidity);
    function sync() external;
}

File 5 of 12 : IWAVAX.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface IWAVAX {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function balanceOf(address owner) external view returns (uint); 
    function withdraw(uint) external;
    function approve(address to, uint value) external returns (bool);
}

File 6 of 12 : IERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    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 permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 7 of 12 : DexLibrary.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./SafeMath.sol";
import "../interfaces/IPair.sol";
import "../interfaces/IWAVAX.sol";

library DexLibrary {
    using SafeMath for uint;
    bytes private constant zeroBytes = new bytes(0);
    IWAVAX private constant WAVAX = IWAVAX(0xB31f66AA3C1e785363F0875A1B74E27b85FD66c7);

    /**
     * @notice Swap directly through a Pair
     * @param amountIn input amount
     * @param fromToken address
     * @param toToken address
     * @param pair Pair used for swap
     * @return output amount
     */
    function swap(uint amountIn, address fromToken, address toToken, IPair pair) internal returns (uint) {
        (address token0,) = sortTokens(fromToken, toToken);
        (uint112 reserve0, uint112 reserve1,) = pair.getReserves();
        if (token0 != fromToken) (reserve0, reserve1) = (reserve1, reserve0);
        uint amountOut1 = 0;
        uint amountOut2 = getAmountOut(amountIn, reserve0, reserve1);
        if (token0 != fromToken) (amountOut1, amountOut2) = (amountOut2, amountOut1);
        safeTransfer(fromToken, address(pair), amountIn);
        pair.swap(amountOut1, amountOut2, address(this), zeroBytes);
        return amountOut2 > amountOut1 ? amountOut2 : amountOut1;
    }

    function checkSwapPairCompatibility(IPair pair, address tokenA, address tokenB) internal pure returns (bool) {
        return (tokenA == pair.token0() || tokenA == pair.token1()) && (tokenB == pair.token0() || tokenB == pair.token1()) && tokenA != tokenB;
    }

    function estimateConversionThroughPair(uint amountIn, address fromToken, address toToken, IPair swapPair) internal view returns (uint) {
        (address token0,) = sortTokens(fromToken, toToken);
        (uint112 reserve0, uint112 reserve1,) = swapPair.getReserves();
        if (token0 != fromToken) (reserve0, reserve1) = (reserve1, reserve0);
        return getAmountOut(amountIn, reserve0, reserve1);
    }

    /**
     * @notice Converts reward tokens to deposit tokens
     * @dev No price checks enforced
     * @param amount reward tokens
     * @return deposit tokens
     */
    function convertRewardTokensToDepositTokens(uint amount, address rewardToken, address depositToken, IPair swapPairToken0, IPair swapPairToken1) internal returns (uint) {
        uint amountIn = amount.div(2);
        require(amountIn > 0, "DexLibrary::_convertRewardTokensToDepositTokens");

        address token0 = IPair(depositToken).token0();
        uint amountOutToken0 = amountIn;
        if (rewardToken != token0) {
            amountOutToken0 = DexLibrary.swap(amountIn, rewardToken, token0, swapPairToken0);
        }

        address token1 = IPair(depositToken).token1();
        uint amountOutToken1 = amountIn;
        if (rewardToken != token1) {
            amountOutToken1 = DexLibrary.swap(amountIn, rewardToken, token1, swapPairToken1);
        }

        return DexLibrary.addLiquidity(depositToken, amountOutToken0, amountOutToken1);
    }

    /**
     * @notice Add liquidity directly through a Pair
     * @dev Checks adding the max of each token amount
     * @param depositToken address
     * @param maxAmountIn0 amount token0
     * @param maxAmountIn1 amount token1
     * @return liquidity tokens
     */
    function addLiquidity(address depositToken, uint maxAmountIn0, uint maxAmountIn1) internal returns (uint) {
        (uint112 reserve0, uint112 reserve1,) = IPair(address(depositToken)).getReserves();
        uint amountIn1 = _quoteLiquidityAmountOut(maxAmountIn0, reserve0, reserve1);
        if (amountIn1 > maxAmountIn1) {
            amountIn1 = maxAmountIn1;
            maxAmountIn0 = _quoteLiquidityAmountOut(maxAmountIn1, reserve1, reserve0);
        }

        safeTransfer(IPair(depositToken).token0(), depositToken, maxAmountIn0);
        safeTransfer(IPair(depositToken).token1(), depositToken, amountIn1);
        return IPair(depositToken).mint(address(this));
    }

    /**
     * @notice Quote liquidity amount out
     * @param amountIn input tokens
     * @param reserve0 size of input asset reserve
     * @param reserve1 size of output asset reserve
     * @return liquidity tokens
     */
    function _quoteLiquidityAmountOut(uint amountIn, uint reserve0, uint reserve1) private pure returns (uint) {
        return amountIn.mul(reserve1).div(reserve0);
    }

    /**
     * @notice Given two tokens, it'll return the tokens in the right order for the tokens pair
     * @dev TokenA must be different from TokenB, and both shouldn't be address(0), no validations
     * @param tokenA address
     * @param tokenB address
     * @return sorted tokens
     */
    function sortTokens(address tokenA, address tokenB) internal pure returns (address, address) {
        return tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
    }

    /**
     * @notice Given an input amount of an asset and pair reserves, returns maximum output amount of the other asset
     * @dev Assumes swap fee is 0.30%
     * @param amountIn input asset
     * @param reserveIn size of input asset reserve
     * @param reserveOut size of output asset reserve
     * @return maximum output amount
     */
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint) {
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        return numerator.div(denominator);
    }

    /**
     * @notice Safely transfer using an anonymous ERC20 token
     * @dev Requires token to return true on transfer
     * @param token address
     * @param to recipient address
     * @param value amount
     */
    function safeTransfer(address token, address to, uint256 value) internal {
        require(IERC20(token).transfer(to, value), "DexLibrary::TRANSFER_FROM_FAILED");
    }
}

File 8 of 12 : SafeMath.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol
// Subject to the MIT license.

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting with custom message on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction underflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    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;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b, string memory errorMessage) 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, errorMessage);

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers.
     * Reverts on division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers.
     * Reverts with custom message on division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 9 of 12 : Ownable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 10 of 12 : Permissioned.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./Ownable.sol";
import "./SafeMath.sol";

abstract contract Permissioned is Ownable {
    using SafeMath for uint;

    uint public numberOfAllowedDepositors;
    mapping(address => bool) public allowedDepositors;

    event AllowDepositor(address indexed account);
    event RemoveDepositor(address indexed account);

    modifier onlyAllowedDeposits() {
        if (numberOfAllowedDepositors > 0) {
            require(allowedDepositors[msg.sender] == true, "Permissioned::onlyAllowedDeposits, not allowed");
        }
        _;
    }

    /**
     * @notice Add an allowed depositor
     * @param depositor address
     */
    function allowDepositor(address depositor) external onlyOwner {
        require(allowedDepositors[depositor] == false, "Permissioned::allowDepositor");
        allowedDepositors[depositor] = true;
        numberOfAllowedDepositors = numberOfAllowedDepositors.add(1);
        emit AllowDepositor(depositor);
    }

    /**
     * @notice Remove an allowed depositor
     * @param depositor address
     */
    function removeDepositor(address depositor) external onlyOwner {
        require(numberOfAllowedDepositors > 0, "Permissioned::removeDepositor, no allowed depositors");
        require(allowedDepositors[depositor] == true, "Permissioned::removeDepositor, not allowed");
        allowedDepositors[depositor] = false;
        numberOfAllowedDepositors = numberOfAllowedDepositors.sub(1);
        emit RemoveDepositor(depositor);
    }
}

File 11 of 12 : YakERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;

import "./lib/SafeMath.sol";
import "./interfaces/IERC20.sol";

abstract contract YakERC20 {
    using SafeMath for uint256;

    string public name = "Yield Yak";
    string public symbol = "YRT";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
  
    mapping (address => mapping (address => uint256)) internal allowances;
    mapping (address => uint256) internal balances;

    /// @dev keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 public constant DOMAIN_TYPEHASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    /// @dev keccak256("1");
    bytes32 public constant VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;

    /// @dev keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    mapping(address => uint) public nonces;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor() {}

    /**
     * @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
     * @param account The address of the account holding the funds
     * @param spender The address of the account spending the funds
     * @return The number of tokens approved
     */
    function allowance(address account, address spender) external view returns (uint) {
        return allowances[account][spender];
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     * and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * It is recommended to use increaseAllowance and decreaseAllowance instead
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 amount) external returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * @notice Get the number of tokens held by the `account`
     * @param account The address of the account to get the balance of
     * @return The number of tokens held
     */
    function balanceOf(address account) external view returns (uint) {
        return balances[account];
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 amount) external returns (bool) {
        _transferTokens(msg.sender, dst, amount);
        return true;
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param amount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(address src, address dst, uint256 amount) external returns (bool) {
        address spender = msg.sender;
        uint256 spenderAllowance = allowances[src][spender];

        if (spender != src && spenderAllowance != uint256(-1)) {
            uint256 newAllowance = spenderAllowance.sub(amount, "transferFrom: transfer amount exceeds allowance");
            allowances[src][spender] = newAllowance;

            emit Approval(src, spender, newAllowance);
        }

        _transferTokens(src, dst, amount);
        return true;
    }


    /**
     * @notice Approval implementation
     * @param owner The address of the account which owns tokens
     * @param spender The address of the account which may transfer tokens
     * @param amount The number of tokens that are approved (2^256-1 means infinite)
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "_approve::owner zero address");
        require(spender != address(0), "_approve::spender zero address");
        allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @notice Transfer implementation
     * @param from The address of the account which owns tokens
     * @param to The address of the account which is receiving tokens
     * @param value The number of tokens that are being transferred
     */
    function _transferTokens(address from, address to, uint256 value) internal {
        require(to != address(0), "_transferTokens: cannot transfer to the zero address");

        balances[from] = balances[from].sub(value, "_transferTokens: transfer exceeds from balance");
        balances[to] = balances[to].add(value);
        emit Transfer(from, to, value);
    }

    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balances[to] = balances[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balances[from] = balances[from].sub(value, "_burn: burn amount exceeds from balance");
        totalSupply = totalSupply.sub(value, "_burn: burn amount exceeds total supply");
        emit Transfer(from, address(0), value);
    }

    /**
     * @notice Triggers an approval from owner to spender
     * @param owner The address to approve from
     * @param spender The address to be approved
     * @param value The number of tokens that are approved (2^256-1 means infinite)
     * @param deadline The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, "permit::expired");

        bytes32 encodeData = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline));
        _validateSignedData(owner, encodeData, v, r, s);

        _approve(owner, spender, value);
    }

    /**
     * @notice Recovers address from signed data and validates the signature
     * @param signer Address that signed the data
     * @param encodeData Data signed by the address
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function _validateSignedData(address signer, bytes32 encodeData, uint8 v, bytes32 r, bytes32 s) internal view {
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                getDomainSeparator(),
                encodeData
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        // Explicitly disallow authorizations for address(0) as ecrecover returns address(0) on malformed messages
        require(recoveredAddress != address(0) && recoveredAddress == signer, "Arch::validateSig: invalid signature");
    }

    /**
     * @notice EIP-712 Domain separator
     * @return Separator
     */
    function getDomainSeparator() public view returns (bytes32) {
        return keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                VERSION_HASH,
                _getChainId(),
                address(this)
            )
        );
    }

    /**
     * @notice Current id of the chain where this contract is deployed
     * @return Chain id
     */
    function _getChainId() internal pure returns (uint) {
        uint256 chainId;
        assembly { chainId := chainid() }
        return chainId;
    }
}

File 12 of 12 : Context.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

/*
 * @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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract ABI

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