Contract

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

/// @notice An error used to indicate that an action could not be completed because either the `msg.sender` or
///         `msg.origin` is not authorized.
error Unauthorized();

/// @notice An error used to indicate that an action could not be completed because the contract either already existed
///         or entered an illegal condition which is not recoverable from.
error IllegalState();

/// @notice An error used to indicate that an action could not be completed because of an illegal argument was passed
///         to the function.
error IllegalArgument();

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

import "../../IERC20Minimal.sol";
import "../../IERC20Metadata.sol";

/// @title  IYearnVaultV2
/// @author Yearn Finance
interface IYearnVaultV2 is IERC20Minimal, IERC20Metadata {
  struct StrategyParams {
    uint256 performanceFee;
    uint256 activation;
    uint256 debtRatio;
    uint256 minDebtPerHarvest;
    uint256 maxDebtPerHarvest;
    uint256 lastReport;
    uint256 totalDebt;
    uint256 totalGain;
    uint256 totalLoss;
    bool enforceChangeLimit;
    uint256 profitLimitRatio;
    uint256 lossLimitRatio;
    address customCheck;
  }

  function apiVersion() external pure returns (string memory);

  function permit(
    address owner,
    address spender,
    uint256 amount,
    uint256 expiry,
    bytes calldata signature
  ) external returns (bool);

  // NOTE: Vyper produces multiple signatures for a given function with "default" args
  function deposit() external returns (uint256);

  function deposit(uint256 amount) external returns (uint256);

  function deposit(uint256 amount, address recipient) external returns (uint256);

  // NOTE: Vyper produces multiple signatures for a given function with "default" args
  function withdraw() external returns (uint256);

  function withdraw(uint256 maxShares) external returns (uint256);

  function withdraw(uint256 maxShares, address recipient) external returns (uint256);

  function withdraw(
    uint256 maxShares,
    address recipient,
    uint256 maxLoss
  ) external returns (uint256);

  function token() external view returns (address);

  function strategies(address _strategy) external view returns (StrategyParams memory);

  function pricePerShare() external view returns (uint256);

  function totalAssets() external view returns (uint256);

  function depositLimit() external view returns (uint256);

  function maxAvailableShares() external view returns (uint256);

  /// @notice View how much the Vault would increase this Strategy's borrow limit, based on its present performance
  ///         (since its last report). Can be used to determine expectedReturn in your Strategy.
  function creditAvailable() external view returns (uint256);

  /// @notice View how much the Vault would like to pull back from the Strategy, based on its present performance
  ///         (since its last report). Can be used to determine expectedReturn in your Strategy.
  function debtOutstanding() external view returns (uint256);

  /// @notice View how much the Vault expect this Strategy to return at the current block, based on its present
  ///         performance (since its last report). Can be used to determine expectedReturn in your Strategy.
  function expectedReturn() external view returns (uint256);

  /// @notice This is the main contact point where the Strategy interacts with the Vault. It is critical that this call
  ///         is handled as intended by the Strategy. Therefore, this function will be called by BaseStrategy to make
  ///         sure the integration is correct.
  function report(
    uint256 _gain,
    uint256 _loss,
    uint256 _debtPayment
  ) external returns (uint256);

  /// @notice This function should only be used in the scenario where the Strategy is being retired but no migration of
  ///         the positions are possible, or in the extreme scenario that the Strategy needs to be put into
  ///         "Emergency Exit" mode in order for it to exit as quickly as possible. The latter scenario could be for any
  ///         reason that is considered "critical" that the Strategy exits its position as fast as possible, such as a
  ///         sudden change in market conditions leading to losses, or an imminent failure in an external dependency.
  function revokeStrategy() external;

  /// @notice View the governance address of the Vault to assert privileged functions can only be called by governance.
  ///         The Strategy serves the Vault, so it is subject to governance defined by the Vault.
  function governance() external view returns (address);

  /// @notice View the management address of the Vault to assert privileged functions can only be called by management.
  ///         The Strategy serves the Vault, so it is subject to management defined by the Vault.
  function management() external view returns (address);

  /// @notice View the guardian address of the Vault to assert privileged functions can only be called by guardian. The
  ///         Strategy serves the Vault, so it is subject to guardian defined by the Vault.
  function guardian() external view returns (address);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

import "./IERC20Minimal.sol";

/// @title  IERC20Burnable
/// @author Mellow Finance
interface IERC20Burnable is IERC20Minimal {
    /// @notice Burns `amount` tokens from the balance of `msg.sender`.
    ///
    /// @param amount The amount of tokens to burn.
    ///
    /// @return If burning the tokens was successful.
    function burn(uint256 amount) external returns (bool);

    /// @notice Burns `amount` tokens from `owner`'s balance.
    ///
    /// @param owner  The address to burn tokens from.
    /// @param amount The amount of tokens to burn.
    ///
    /// @return If burning the tokens was successful.
    function burnFrom(address owner, uint256 amount) external returns (bool);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

/// @title  IERC20Metadata
/// @author Mellow Finance
interface IERC20Metadata {
    /// @notice Gets the name of the token.
    ///
    /// @return The name.
    function name() external view returns (string memory);

    /// @notice Gets the symbol of the token.
    ///
    /// @return The symbol.
    function symbol() external view returns (string memory);

    /// @notice Gets the number of decimals that the token has.
    ///
    /// @return The number of decimals.
    function decimals() external view returns (uint8);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

/// @title  IERC20Minimal
/// @author Mellow Finance
interface IERC20Minimal {
    /// @notice An event which is emitted when tokens are transferred between two parties.
    ///
    /// @param owner     The owner of the tokens from which the tokens were transferred.
    /// @param recipient The recipient of the tokens to which the tokens were transferred.
    /// @param amount    The amount of tokens which were transferred.
    event Transfer(address indexed owner, address indexed recipient, uint256 amount);

    /// @notice An event which is emitted when an approval is made.
    ///
    /// @param owner   The address which made the approval.
    /// @param spender The address which is allowed to transfer tokens on behalf of `owner`.
    /// @param amount  The amount of tokens that `spender` is allowed to transfer.
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /// @notice Gets the current total supply of tokens.
    ///
    /// @return The total supply.
    function totalSupply() external view returns (uint256);

    /// @notice Gets the balance of tokens that an account holds.
    ///
    /// @param account The account address.
    ///
    /// @return The balance of the account.
    function balanceOf(address account) external view returns (uint256);

    /// @notice Gets the allowance that an owner has allotted for a spender.
    ///
    /// @param owner   The owner address.
    /// @param spender The spender address.
    ///
    /// @return The number of tokens that `spender` is allowed to transfer on behalf of `owner`.
    function allowance(address owner, address spender) external view returns (uint256);

    /// @notice Transfers `amount` tokens from `msg.sender` to `recipient`.
    ///
    /// @notice Emits a {Transfer} event.
    ///
    /// @param recipient The address which will receive the tokens.
    /// @param amount    The amount of tokens to transfer.
    ///
    /// @return If the transfer was successful.
    function transfer(address recipient, uint256 amount) external returns (bool);

    /// @notice Approves `spender` to transfer `amount` tokens on behalf of `msg.sender`.
    ///
    /// @notice Emits a {Approval} event.
    ///
    /// @param spender The address which is allowed to transfer tokens on behalf of `msg.sender`.
    /// @param amount  The amount of tokens that `spender` is allowed to transfer.
    ///
    /// @return If the approval was successful.
    function approve(address spender, uint256 amount) external returns (bool);

    /// @notice Transfers `amount` tokens from `owner` to `recipient` using an approval that `owner` gave to `msg.sender`.
    ///
    /// @notice Emits a {Approval} event.
    /// @notice Emits a {Transfer} event.
    ///
    /// @param owner     The address to transfer tokens from.
    /// @param recipient The address that will receive the tokens.
    /// @param amount    The amount of tokens to transfer.
    ///
    /// @return If the transfer was successful.
    function transferFrom(address owner, address recipient, uint256 amount) external returns (bool);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

import "./IERC20Minimal.sol";

/// @title  IERC20Mintable
/// @author Mellow Finance
interface IERC20Mintable is IERC20Minimal {
    /// @notice Mints `amount` tokens to `recipient`.
    ///
    /// @param recipient The address which will receive the minted tokens.
    /// @param amount    The amount of tokens to mint.
    ///
    /// @return If minting the tokens was successful.
    function mint(address recipient, uint256 amount) external returns (bool);
}

//SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

/// @title  ITokenAdapter
/// @author Mellow Finance
interface ITokenAdapter {
    /// @notice Gets the current version.
    ///
    /// @return The version.
    function version() external view returns (string memory);

    /// @notice Gets the address of the yield token that this adapter supports.
    ///
    /// @return The address of the yield token.
    function token() external view returns (address);

    /// @notice Gets the address of the underlying token that the yield token wraps.
    ///
    /// @return The address of the underlying token.
    function underlyingToken() external view returns (address);

    /// @notice Gets the number of underlying tokens that a single whole yield token is redeemable for.
    ///
    /// @return The price.
    function price() external view returns (uint256);

    /// @notice Wraps `amount` underlying tokens into the yield token.
    ///
    /// @param amount           The amount of the underlying token to wrap.
    /// @param recipient        The address which will receive the yield tokens.
    ///
    /// @return amountYieldTokens The amount of yield tokens minted to `recipient`.
    function wrap(uint256 amount, address recipient)
        external
        returns (uint256 amountYieldTokens);

    /// @notice Unwraps `amount` yield tokens into the underlying token.
    ///
    /// @param amount           The amount of yield-tokens to redeem.
    /// @param recipient        The recipient of the resulting underlying-tokens.
    ///
    /// @return amountUnderlyingTokens The amount of underlying tokens unwrapped to `recipient`.
    function unwrap(uint256 amount, address recipient)
        external
        returns (uint256 amountUnderlyingTokens);
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.11;

import "../interfaces/IERC20Burnable.sol";
import "../interfaces/IERC20Metadata.sol";
import "../interfaces/IERC20Minimal.sol";
import "../interfaces/IERC20Mintable.sol";

/// @title  TokenUtils
/// @author Mellow Finance
library TokenUtils {
    /// @notice An error used to indicate that a call to an ERC20 contract failed.
    ///
    /// @param target  The target address.
    /// @param success If the call to the token was a success.
    /// @param data    The resulting data from the call. This is error data when the call was not a success. Otherwise,
    ///                this is malformed data when the call was a success.
    error ERC20CallFailed(address target, bool success, bytes data);

    /// @dev A safe function to get the decimals of an ERC20 token.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the query fails or returns an unexpected value.
    ///
    /// @param token The target token.
    ///
    /// @return The amount of decimals of the token.
    function expectDecimals(address token) internal view returns (uint8) {
        (bool success, bytes memory data) = token.staticcall(
            abi.encodeWithSelector(IERC20Metadata.decimals.selector)
        );

        if (!success || data.length < 32) {
            revert ERC20CallFailed(token, success, data);
        }

        return abi.decode(data, (uint8));
    }

    /// @dev Gets the balance of tokens held by an account.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the query fails or returns an unexpected value.
    ///
    /// @param token   The token to check the balance of.
    /// @param account The address of the token holder.
    ///
    /// @return The balance of the tokens held by an account.
    function safeBalanceOf(address token, address account) internal view returns (uint256) {
        (bool success, bytes memory data) = token.staticcall(
            abi.encodeWithSelector(IERC20Minimal.balanceOf.selector, account)
        );

        if (!success || data.length < 32) {
            revert ERC20CallFailed(token, success, data);
        }

        return abi.decode(data, (uint256));
    }

    /// @dev Transfers tokens to another address.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the transfer failed or returns an unexpected value.
    ///
    /// @param token     The token to transfer.
    /// @param recipient The address of the recipient.
    /// @param amount    The amount of tokens to transfer.
    function safeTransfer(address token, address recipient, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Minimal.transfer.selector, recipient, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }

    /// @dev Approves tokens for the smart contract.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the approval fails or returns an unexpected value.
    ///
    /// @param token   The token to approve.
    /// @param spender The contract to spend the tokens.
    /// @param value   The amount of tokens to approve.
    function safeApprove(address token, address spender, uint256 value) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Minimal.approve.selector, spender, value)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }

    /// @dev Transfer tokens from one address to another address.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the transfer fails or returns an unexpected value.
    ///
    /// @param token     The token to transfer.
    /// @param owner     The address of the owner.
    /// @param recipient The address of the recipient.
    /// @param amount    The amount of tokens to transfer.
    function safeTransferFrom(address token, address owner, address recipient, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Minimal.transferFrom.selector, owner, recipient, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }

    /// @dev Mints tokens to an address.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the mint fails or returns an unexpected value.
    ///
    /// @param token     The token to mint.
    /// @param recipient The address of the recipient.
    /// @param amount    The amount of tokens to mint.
    function safeMint(address token, address recipient, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Mintable.mint.selector, recipient, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }

    /// @dev Burns tokens.
    ///
    /// Reverts with a `CallFailed` error if execution of the burn fails or returns an unexpected value.
    ///
    /// @param token  The token to burn.
    /// @param amount The amount of tokens to burn.
    function safeBurn(address token, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Burnable.burn.selector, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }

    /// @dev Burns tokens from its total supply.
    ///
    /// @dev Reverts with a {CallFailed} error if execution of the burn fails or returns an unexpected value.
    ///
    /// @param token  The token to burn.
    /// @param owner  The owner of the tokens.
    /// @param amount The amount of tokens to burn.
    function safeBurnFrom(address token, address owner, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20Burnable.burnFrom.selector, owner, amount)
        );

        if (!success || (data.length != 0 && !abi.decode(data, (bool)))) {
            revert ERC20CallFailed(token, success, data);
        }
    }
}

pragma solidity ^0.8.11;

import {IllegalState} from "./base/Errors.sol";

import "./interfaces/ITokenAdapter.sol";
import "./interfaces/external/yearn/IYearnVaultV2.sol";

import "./libraries/TokenUtils.sol";

/// @title  YearnTokenAdapter
/// @author Mellow Finance
contract YearnTokenAdapter is ITokenAdapter {
    uint256 private constant MAXIMUM_SLIPPAGE = 10000;
    string public constant override version = "2.1.0";

    address public immutable override token;
    address public immutable override underlyingToken;

    constructor(address _token, address _underlyingToken) {
        token = _token;
        underlyingToken = _underlyingToken;
    }

    /// @inheritdoc ITokenAdapter
    function price() external view override returns (uint256) {
        return IYearnVaultV2(token).pricePerShare();
    }

    /// @inheritdoc ITokenAdapter
    function wrap(uint256 amount, address recipient) external override returns (uint256) {
        TokenUtils.safeTransferFrom(underlyingToken, msg.sender, address(this), amount);
        TokenUtils.safeApprove(underlyingToken, token, amount);

        return IYearnVaultV2(token).deposit(amount, recipient);
    }

    /// @inheritdoc ITokenAdapter
    function unwrap(uint256 amount, address recipient) external override returns (uint256) {
        TokenUtils.safeTransferFrom(token, msg.sender, address(this), amount);

        uint256 balanceBefore = TokenUtils.safeBalanceOf(token, address(this));

        uint256 amountWithdrawn = IYearnVaultV2(token).withdraw(amount, recipient, MAXIMUM_SLIPPAGE);

        uint256 balanceAfter = TokenUtils.safeBalanceOf(token, address(this));

        // If the Yearn vault did not burn all of the shares then revert. This is critical in mathematical operations
        // performed by the system because the system always expects that all of the tokens were unwrapped. In Yearn,
        // this sometimes does not happen in cases where strategies cannot withdraw all of the requested tokens (an
        // example strategy where this can occur is with Compound and AAVE where funds may not be accessible because
        // they were lent out).
        if (balanceBefore - balanceAfter != amount) {
            revert IllegalState();
        }

        return amountWithdrawn;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_underlyingToken","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bool","name":"success","type":"bool"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"ERC20CallFailed","type":"error"},{"inputs":[],"name":"IllegalState","type":"error"},{"inputs":[],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlyingToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"unwrap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"wrap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000a354f35829ae975e850e23e9615b11da1b3dc4de000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48

-----Decoded View---------------
Arg [0] : _token (address): 0xa354F35829Ae975e850e23e9615b11Da1B3dC4DE
Arg [1] : _underlyingToken (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000a354f35829ae975e850e23e9615b11da1b3dc4de
Arg [1] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48