[VEN-1193]: Generic Swapper Contract to Shift Position

.solhint.json

@@ -10,6 +10,6 @@
     "not-rely-on-time": "off",
     "no-global-import": "error",
     "reason-string": ["warn", { "maxLength": 64 }],
-    "ordering": "error"
+    "ordering": "warn"
   }
 }

README.md

@@ -4,7 +4,7 @@ Venus Periphery is an extension of the Venus Protocol ecosystem that contains au
 
 # Contracts
 
-The first major addition in this repository is the CollateralSwapper, a flexible module that enables users to swap their supplied collateral from one market to another directly within the Venus ecosystem.
+The first major addition in this repository is the PositionSwapper, a flexible module that enables users to swap their collateral or debt from one market to another directly within the Venus ecosystem.
 
 # Development
 

contracts/Interfaces.sol

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: BSD-3-Clause
+pragma solidity ^0.8.25;
+
+import { IERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
+import { ResilientOracleInterface } from "@venusprotocol/oracle/contracts/interfaces/OracleInterface.sol";
+
+interface IVToken is IERC20Upgradeable {
+    function accrueInterest() external returns (uint256);
+
+    function redeem(uint256 redeemTokens) external returns (uint256);
+
+    function redeemUnderlying(uint256 redeemAmount) external returns (uint256);
+
+    function borrowBalanceCurrent(address borrower) external returns (uint256);
+
+    function balanceOfUnderlying(address owner) external returns (uint256);
+
+    function seize(address liquidator, address borrower, uint seizeTokens) external returns (uint);
+
+    function mintBehalf(address receiver, uint mintAmount) external returns (uint);
+
+    function borrowBehalf(address borrower, uint borrowAmount) external returns (uint256);
+
+    function repayBorrowBehalf(address borrower, uint repayAmount) external returns (uint256);
+
+    function comptroller() external view returns (IComptroller);
+
+    function borrowBalanceStored(address account) external view returns (uint256);
+
+    function underlying() external view returns (address);
+}
+
+interface IVBNB is IVToken {
+    function repayBorrowBehalf(address borrower) external payable;
+
+    function liquidateBorrow(address borrower, IVToken vTokenCollateral) external payable;
+}
+
+interface IComptroller {
+    enum Action {
+        MINT,
+        REDEEM,
+        BORROW,
+        REPAY,
+        SEIZE,
+        LIQUIDATE,
+        TRANSFER,
+        ENTER_MARKET,
+        EXIT_MARKET
+    }
+
+    function _setActionsPaused(address[] calldata markets_, Action[] calldata actions_, bool paused_) external;
+
+    function enterMarkets(address[] calldata vTokens) external returns (uint256[] memory);
+
+    function enterMarket(address user, address vToken) external returns (uint256);
+
+    function liquidationIncentiveMantissa() external view returns (uint256);
+
+    function vaiController() external view returns (address);
+
+    function liquidatorContract() external view returns (address);
+
+    function oracle() external view returns (ResilientOracleInterface);
+
+    function actionPaused(address market, Action action) external view returns (bool);
+
+    function markets(address) external view returns (bool, uint256, bool);
+
+    function isForcedLiquidationEnabled(address) external view returns (bool);
+
+    function approvedDelegates(address borrower, address delegate) external view returns (bool);
+
+    function getAccountLiquidity(address account) external view returns (uint256, uint256, uint256);
+
+    function checkMembership(address account, IVToken vToken) external view returns (bool);
+}
+
+interface IWBNB is IERC20Upgradeable {
+    function deposit() external payable;
+
+    function withdraw(uint256 amount) external;
+}

contracts/PositionSwapper/ISwapHelper.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: BSD-3-Clause
+pragma solidity 0.8.25;
+
+interface ISwapHelper {
+    function swapInternal(address tokenA, address tokenB, uint256 amount) external payable;
+}