Feat/leveraged steth

src/vault/adapter/aave/aaveV3/IAaveV3.sol

@@ -72,12 +72,39 @@ interface ILendingPool {
     address to
   ) external returns (uint256);
 
+  function repay(
+    address asset,
+    uint256 amount,
+    uint256 rateMode,
+    address onBehalfOf
+  ) external returns (uint256);
+
+  function borrow(
+    address asset,
+    uint256 amount,
+    uint256 interestRateMode,
+    uint16 referralCode,
+    address onBehalfOf
+  ) external;
+
+  function flashLoan(
+    address receiverAddress, 
+    address[] memory assets, 
+    uint256[] memory amounts, 
+    uint256[] memory interestRateModes, 
+    address onBehalfOf, 
+    bytes calldata params, 
+    uint16 referralCode
+  ) external;
+
+  function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external;
+
   /**
    * @dev Returns the state and configuration of the reserve
    * @param asset The address of the underlying asset of the reserve
    * @return The state of the reserve
    **/
-  function getReserveData(address asset) external view returns (DataTypes.ReserveData memory);
+  function getReserveData(address asset) external view returns (DataTypes.ReserveData2 memory);
 
   function getReserveNormalizedIncome(address asset) external view returns (uint256);
 }
@@ -93,3 +120,90 @@ interface IProtocolDataProvider {
       address variableDebtTokenAddress
     );
 }
+
+interface IFlashLoanReceiver {
+  /**
+   * @notice Executes an operation after receiving the flash-borrowed assets
+   * @dev Ensure that the contract can return the debt + premium, e.g., has
+   *      enough funds to repay and has approved the Pool to pull the total amount
+   * @param assets The addresses of the flash-borrowed assets
+   * @param amounts The amounts of the flash-borrowed assets
+   * @param premiums The fee of each flash-borrowed asset
+   * @param initiator The address of the flashloan initiator
+   * @param params The byte-encoded params passed when initiating the flashloan
+   * @return True if the execution of the operation succeeds, false otherwise
+   */
+  function executeOperation(
+    address[] calldata assets,
+    uint256[] calldata amounts,
+    uint256[] calldata premiums,
+    address initiator,
+    bytes calldata params
+  ) external returns (bool);
+
+  function ADDRESSES_PROVIDER() external view returns (IPoolAddressesProvider);
+
+  function POOL() external view returns (ILendingPool);
+}
+
+/**
+ * @title IPoolAddressesProvider
+ * @author Aave
+ * @notice Defines the basic interface for a Pool Addresses Provider.
+ */
+interface IPoolAddressesProvider {
+  /**
+   * @notice Returns the id of the Aave market to which this contract points to.
+   * @return The market id
+   */
+  function getMarketId() external view returns (string memory);
+
+  /**
+   * @notice Associates an id with a specific PoolAddressesProvider.
+   * @dev This can be used to create an onchain registry of PoolAddressesProviders to
+   * identify and validate multiple Aave markets.
+   * @param newMarketId The market id
+   */
+  function setMarketId(string calldata newMarketId) external;
+
+  /**
+   * @notice Returns an address by its identifier.
+   * @dev The returned address might be an EOA or a contract, potentially proxied
+   * @dev It returns ZERO if there is no registered address with the given id
+   * @param id The id
+   * @return The address of the registered for the specified id
+   */
+  function getAddress(bytes32 id) external view returns (address);
+
+  /**
+   * @notice General function to update the implementation of a proxy registered with
+   * certain `id`. If there is no proxy registered, it will instantiate one and
+   * set as implementation the `newImplementationAddress`.
+   * @dev IMPORTANT Use this function carefully, only for ids that don't have an explicit
+   * setter function, in order to avoid unexpected consequences
+   * @param id The id
+   * @param newImplementationAddress The address of the new implementation
+   */
+  function setAddressAsProxy(bytes32 id, address newImplementationAddress) external;
+
+  /**
+   * @notice Sets an address for an id replacing the address saved in the addresses map.
+   * @dev IMPORTANT Use this function carefully, as it will do a hard replacement
+   * @param id The id
+   * @param newAddress The address to set
+   */
+  function setAddress(bytes32 id, address newAddress) external;
+
+  /**
+   * @notice Returns the address of the Pool proxy.
+   * @return The Pool proxy address
+   */
+  function getPool() external view returns (address);
+
+  /**
+   * @notice Updates the implementation of the Pool, or creates a proxy
+   * setting the new `pool` implementation when the function is called for the first time.
+   * @param newPoolImpl The new Pool implementation
+   */
+  function setPoolImpl(address newPoolImpl) external;
+}

src/vault/adapter/aave/aaveV3/lib.sol

@@ -27,6 +27,39 @@ library DataTypes {
     uint8 id;
   }
 
+  struct ReserveData2 {
+    //stores the reserve configuration
+    ReserveConfigurationMap configuration;
+    //the liquidity index. Expressed in ray
+    uint128 liquidityIndex;
+    //the current supply rate. Expressed in ray
+    uint128 currentLiquidityRate;
+    //variable borrow index. Expressed in ray
+    uint128 variableBorrowIndex;
+    //the current variable borrow rate. Expressed in ray
+    uint128 currentVariableBorrowRate;
+    //the current stable borrow rate. Expressed in ray
+    uint128 currentStableBorrowRate;
+    //timestamp of last update
+    uint40 lastUpdateTimestamp;
+    //the id of the reserve. Represents the position in the list of the active reserves
+    uint16 id;
+    //aToken address
+    address aTokenAddress;
+    //stableDebtToken address
+    address stableDebtTokenAddress;
+    //variableDebtToken address
+    address variableDebtTokenAddress;
+    //address of the interest rate strategy
+    address interestRateStrategyAddress;
+    //the current treasury balance, scaled
+    uint128 accruedToTreasury;
+    //the outstanding unbacked aTokens minted through the bridging feature
+    uint128 unbacked;
+    //the outstanding debt borrowed against this asset in isolation mode
+    uint128 isolationModeTotalDebt;
+  }
+
   struct ReserveConfigurationMap {
     //bit 0-15: LTV
     //bit 16-31: Liq. threshold

src/vault/adapter/lido/IwstETH.sol

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-3.0
+
+pragma solidity ^0.8.15;
+
+interface IwstETH {
+    // Returns amount of wstETH for a given amount of stETH
+    function getWstETHByStETH(uint256 _stETHAmount) external view returns (uint256);
+
+    // Returns amount of stETH for a given amount of wstETH
+    function getStETHByWstETH(uint256 _wstETHAmount) external view returns (uint256);
+
+    // Exchanges wstETH to stETH - return amount of stETH received
+    function unwrap(uint256 _wstETHAmount) external returns (uint256);
+}