add SY wrapper for rUSD

contracts/core/StandardizedYield/implementations/ReservoirProtocol/PendleUSDESY.sol

@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+pragma solidity ^0.8.17;
+
+import "../../SYBaseUpg.sol";
+
+interface ICrediEnforcer {
+    function mintStablecoin(uint256) external returns (uint256);
+}
+
+interface IPegStabilityModule { {
+    function redeem(address, uint256) external;
+}
+
+contract PendleRUSDSY is SYBaseUpg {
+    address public constant USDC = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
+    address public constant RUSD = 0x09D4214C03D01F49544C0448DBE3A27f768F2b34;
+
+    address public constant PSM = 0x4809010926aec940b550D34a46A52739f996D75D;
+    address public constant CREDIT_ENFORSER = 0x04716DB62C085D9e08050fcF6F7D775A03d07720;
+
+    onstructor() SYBaseUpg(RUSD) {}
+
+    function initialize() external initializer {
+        __SYBaseUpg_init("SY Reservoir Protocol RUSD", "SY-RUSD");
+
+        _safeApproveInf(RUSD, PSM);
+        _safeApproveInf(USDC, CREDIT_ENFORSER);
+    }
+
+    /*///////////////////////////////////////////////////////////////
+                    DEPOSIT/REDEEM USING BASE TOKENS
+    //////////////////////////////////////////////////////////////*/
+
+    function _deposit(
+        address tokenIn,
+        uint256 amountDeposited
+    ) internal virtual override returns (uint256 /*amountSharesOut*/) {
+        if (tokenIn == USDC) {
+            ICrediEnforcer(CREDIT_ENFORSER).mintStablecoin(amountDeposited);
+        }
+        return amountDeposited;
+    }
+
+    function _redeem(
+        address receiver,
+        address tokenOut,
+        uint256 amountSharesToRedeem
+    ) internal override returns (uint256) {
+        if (tokenOut == USDC) {
+            IPegStabilityModule(PSM).redeem(receiver, amountSharesToRedeem);
+        }
+        return amountSharesToRedeem;
+    }
+
+    /*///////////////////////////////////////////////////////////////
+                               EXCHANGE-RATE
+    //////////////////////////////////////////////////////////////*/
+
+    function exchangeRate() public view virtual override returns (uint256) {
+        return PMath.ONE;
+    }
+
+    /*///////////////////////////////////////////////////////////////
+                MISC FUNCTIONS FOR METADATA
+    //////////////////////////////////////////////////////////////*/
+
+    function _previewDeposit(
+        address /*tokenIn*/,
+        uint256 amountTokenToDeposit
+    ) internal pure override returns (uint256 /*amountSharesOut*/) {
+        return amountTokenToDeposit;
+    }
+
+    function _previewRedeem(
+        address /*tokenOut*/,
+        uint256 amountSharesToRedeem
+    ) internal pure override returns (uint256 /*amountTokenOut*/) {
+        return amountSharesToRedeem;
+    }
+
+    function getTokensIn() public pure override returns (address[] memory res) {
+        return ArrayLib.create(RUSD, USDC);
+    }
+
+    function getTokensOut() public pure override returns (address[] memory res) {
+        return ArrayLib.create(USDC);
+    }
+
+    function isValidTokenIn(address token) public pure override returns (bool) {
+        return token == RUSD || token == USDC;
+    }
+
+    function isValidTokenOut(address token) public pure override returns (bool) {
+        return token == RUSD;
+    }
+
+    function assetInfo() external view returns (AssetType assetType, address assetAddress, uint8 assetDecimals) {
+        return (AssetType.TOKEN, RUSD, IERC20Metadata(RUSD).decimals());
+    }
+}