Contract 0x248FCb04de8901c32e0815349f071542556cCF91 1

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

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

    /**
     * @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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.4.0 <0.8.0;

/// @title Defines the functions used to interact with a yield source.  The Prize Pool inherits this contract.
/// @notice Prize Pools subclasses need to implement this interface so that yield can be generated.
interface IYieldSource {

  /// @notice Returns the ERC20 asset token used for deposits.
  /// @return The ERC20 asset token
  function depositToken() external view returns (address);

  /// @notice Returns the total balance (in asset tokens).  This includes the deposits and interest.
  /// @return The underlying balance of asset tokens
  function balanceOfToken(address addr) external returns (uint256);

  /// @notice Supplies tokens to the yield source.  Allows assets to be supplied on other user's behalf using the `to` param.
  /// @param amount The amount of `token()` to be supplied
  /// @param to The user whose balance will receive the tokens
  function supplyTokenTo(uint256 amount, address to) external;

  /// @notice Redeems tokens from the yield source.
  /// @param amount The amount of `token()` to withdraw.  Denominated in `token()` as above.
  /// @return The actual amount of tokens that were redeemed.
  function redeemToken(uint256 amount) external returns (uint256);

}

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.6.0 <0.7.0;

import {
    IYieldSource
} from "@pooltogether/yield-source-interface/contracts/IYieldSource.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";

interface ISushiBar {
    function enter(uint256 _amount) external;

    function leave(uint256 _share) external;

    function totalSupply() external view returns (uint256);

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

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);
}

interface ISushi {
    function balanceOf(address account) external view returns (uint256);

    function transferFrom(
        address from,
        address account,
        uint256 amount
    ) external returns (bool);

    function transfer(address account, uint256 amount) external returns (bool);

    function approve(address spender, uint256 amount) external returns (bool);
}

contract SushiYieldSource is IYieldSource {
    using SafeMath for uint256;
    address public sushiBar;
    address public sushiAddr;
    mapping(address => uint256) public balances;

    constructor(address _sushiBar, address _sushiAddr) public {
        sushiBar = _sushiBar;
        sushiAddr = _sushiAddr;
    }

    /// @notice Returns the ERC20 asset token used for deposits.
    /// @return The ERC20 asset token
    function depositToken() public view override returns (address) {
        return (sushiAddr);
    }

    /// @notice Returns the total balance (in asset tokens).  This includes the deposits and interest.
    /// @return The underlying balance of asset tokens
    function balanceOfToken(address addr) public override returns (uint256) {
        uint256 shares = ISushiBar(sushiBar).balanceOf(address(this));
        uint256 totalShares = ISushiBar(sushiBar).totalSupply();
        uint256 sushiBalance =
            shares.mul(ISushi(sushiAddr).balanceOf(address(sushiBar))).div(
                totalShares
            );

        return (balances[addr].mul(sushiBalance).div(totalShares));
    }

    /// @notice Supplies asset tokens to the yield source.
    /// @param mintAmount The amount of asset tokens to be supplied
    /// @param to The account to be credited
    function supplyTokenTo(uint256 mintAmount, address to) public override {
        ISushi(sushiAddr).transferFrom(msg.sender, address(this), mintAmount);
        ISushi(sushiAddr).approve(sushiBar, mintAmount);

        ISushiBar bar = ISushiBar(sushiBar);
        uint256 beforeBalance = bar.balanceOf(address(this));
        bar.enter(mintAmount);
        uint256 afterBalance = bar.balanceOf(address(this));
        uint256 balanceDiff = afterBalance.sub(beforeBalance);
        balances[to] = balances[to].add(balanceDiff);
    }

    /// @notice Redeems asset tokens from the yield source.
    /// @param redeemAmount The amount of yield-bearing tokens to be redeemed
    /// @return The actual amount of tokens that were redeemed.
    function redeemToken(uint256 redeemAmount)
        public
        override
        returns (uint256)
    {
        ISushiBar bar = ISushiBar(sushiBar);
        ISushi sushi = ISushi(sushiAddr);

        uint256 totalShares = bar.totalSupply();
        uint256 barSushiBalance = sushi.balanceOf(address(bar));
        uint256 requiredShares =
            redeemAmount.mul(totalShares).div(barSushiBalance);

        uint256 barBeforeBalance = bar.balanceOf(address(this));
        uint256 sushiBeforeBalance = sushi.balanceOf(address(this));

        bar.leave(requiredShares);

        uint256 barAfterBalance = bar.balanceOf(address(this));
        uint256 sushiAfterBalance = sushi.balanceOf(address(this));

        uint256 barBalanceDiff = barBeforeBalance.sub(barAfterBalance);
        uint256 sushiBalanceDiff = sushiAfterBalance.sub(sushiBeforeBalance);

        balances[msg.sender] = balances[msg.sender].sub(barBalanceDiff);
        sushi.transfer(msg.sender, sushiBalanceDiff);
        return (sushiBalanceDiff);
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

[{"inputs":[{"internalType":"address","name":"_sushiBar","type":"address"},{"internalType":"address","name":"_sushiAddr","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"balanceOfToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"depositToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"redeemAmount","type":"uint256"}],"name":"redeemToken","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"mintAmount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"supplyTokenTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"sushiAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sushiBar","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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