Fixed LI-CF PreLiquidation

.github/workflows/foundry.yml

@@ -0,0 +1,31 @@
+name: Foundry
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: true
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+
+      - name: Run forge fmt
+        run: forge fmt --check
+
+      - name: Run forge build
+        run: forge build --sizes
+
+      - name: Run forge tests
+        run: forge test -vvv

.gitmodules

@@ -1,3 +1,9 @@
 [submodule "lib/forge-std"]
 	path = lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
+[submodule "lib/morpho-blue"]
+	path = lib/morpho-blue
+	url = [email protected]:morpho-org/morpho-blue.git
+[submodule "lib/solmate"]
+	path = lib/solmate
+	url = https://github.com/transmissions11/solmate

foundry.toml

@@ -2,5 +2,7 @@
 src = "src"
 out = "out"
 libs = ["lib"]
+via_ir = true
+optimizer_runs = 999999 # Etherscan does not support verifying contracts with more optimization runs.
 
 # See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options

src/PreLiquidation.sol

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+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity 0.8.27;
+
+import {Id, MarketParams, IMorpho, Position, Market} from "../lib/morpho-blue/src/interfaces/IMorpho.sol";
+import {IOracle} from "../lib/morpho-blue/src/interfaces/IOracle.sol";
+import {UtilsLib} from "../lib/morpho-blue/src/libraries/UtilsLib.sol";
+import {ORACLE_PRICE_SCALE} from "../lib/morpho-blue/src/libraries/ConstantsLib.sol";
+import {WAD, MathLib} from "../lib/morpho-blue/src/libraries/MathLib.sol";
+import {SharesMathLib} from "../lib/morpho-blue/src/libraries/SharesMathLib.sol";
+import {SafeTransferLib} from "../lib/solmate/src/utils/SafeTransferLib.sol";
+import {ERC20} from "../lib/solmate/src/tokens/ERC20.sol";
+import {EventsLib} from "./libraries/EventsLib.sol";
+import {ErrorsLib} from "./libraries/ErrorsLib.sol";
+import {IPreLiquidationCallback} from "./interfaces/IPreLiquidationCallback.sol";
+import {IPreLiquidation, PreLiquidationParams} from "./interfaces/IPreLiquidation.sol";
+import {IMorphoRepayCallback} from "../lib/morpho-blue/src/interfaces/IMorphoCallbacks.sol";
+
+/// @title PreLiquidation
+/// @author Morpho Labs
+/// @custom:contact [email protected]
+/// @notice The Fixed LI, Fixed CF pre-liquidation contract for Morpho.
+contract PreLiquidation is IPreLiquidation, IMorphoRepayCallback {
+    using SharesMathLib for uint256;
+    using MathLib for uint256;
+    using SafeTransferLib for ERC20;
+
+    /* IMMUTABLE */
+
+    /// @notice Morpho's address.
+    IMorpho public immutable MORPHO;
+    /// @notice The id of the Morpho Market specific to the PreLiquidation contract.
+    Id public immutable ID;
+
+    // Market parameters
+    address internal immutable LOAN_TOKEN;
+    address internal immutable COLLATERAL_TOKEN;
+    address internal immutable ORACLE;
+    address internal immutable IRM;
+    uint256 internal immutable LLTV;
+
+    // Pre-liquidation parameters
+    uint256 internal immutable PRE_LLTV;
+    uint256 internal immutable CLOSE_FACTOR;
+    uint256 internal immutable PRE_LIQUIDATION_INCENTIVE_FACTOR;
+    address internal immutable PRE_LIQUIDATION_ORACLE;
+
+    /// @notice The Morpho market parameters specific to the PreLiquidation contract.
+    function marketParams() public view returns (MarketParams memory) {
+        return MarketParams({
+            loanToken: LOAN_TOKEN,
+            collateralToken: COLLATERAL_TOKEN,
+            oracle: ORACLE,
+            irm: IRM,
+            lltv: LLTV
+        });
+    }
+
+    /// @notice The pre-liquidation parameters specific to the PreLiquidation contract.
+    function preLiquidationParams() external view returns (PreLiquidationParams memory) {
+        return PreLiquidationParams({
+            preLltv: PRE_LLTV,
+            closeFactor: CLOSE_FACTOR,
+            preLiquidationIncentiveFactor: PRE_LIQUIDATION_INCENTIVE_FACTOR,
+            preLiquidationOracle: PRE_LIQUIDATION_ORACLE
+        });
+    }
+
+    /* CONSTRUCTOR */
+
+    /// @dev Initializes the PreLiquidation contract.
+    /// @param morpho The address of the Morpho protocol.
+    /// @param id The id of the Morpho market on which pre-liquidations will occur.
+    /// @param _preLiquidationParams The pre-liquidation parameters.
+    constructor(address morpho, Id id, PreLiquidationParams memory _preLiquidationParams) {
+        require(IMorpho(morpho).market(id).lastUpdate != 0, ErrorsLib.NonexistentMarket());
+        MarketParams memory _marketParams = IMorpho(morpho).idToMarketParams(id);
+        require(_preLiquidationParams.preLltv < _marketParams.lltv, ErrorsLib.PreLltvTooHigh());
+        require(_preLiquidationParams.closeFactor <= WAD, ErrorsLib.CloseFactorTooHigh());
+        require(
+            _preLiquidationParams.preLiquidationIncentiveFactor >= WAD, ErrorsLib.PreLiquidationIncentiveFactorTooLow()
+        );
+
+        MORPHO = IMorpho(morpho);
+
+        ID = id;
+
+        LOAN_TOKEN = _marketParams.loanToken;
+        COLLATERAL_TOKEN = _marketParams.collateralToken;
+        ORACLE = _marketParams.oracle;
+        IRM = _marketParams.irm;
+        LLTV = _marketParams.lltv;
+
+        PRE_LLTV = _preLiquidationParams.preLltv;
+        CLOSE_FACTOR = _preLiquidationParams.closeFactor;
+        PRE_LIQUIDATION_INCENTIVE_FACTOR = _preLiquidationParams.preLiquidationIncentiveFactor;
+        PRE_LIQUIDATION_ORACLE = _preLiquidationParams.preLiquidationOracle;
+
+        ERC20(LOAN_TOKEN).safeApprove(morpho, type(uint256).max);
+    }
+
+    /* PRE-LIQUIDATION */
+
+    /// @notice Pre-liquidates the given borrower on the market of this contract and with the parameters of this contract.
+    /// @dev Either `seizedAssets` or `repaidShares` should be zero.
+    /// @param borrower The owner of the position.
+    /// @param seizedAssets The amount of collateral to seize.
+    /// @param repaidShares The amount of shares to repay.
+    /// @param data Arbitrary data to pass to the `onPreLiquidate` callback. Pass empty data if not needed.
+    function preLiquidate(address borrower, uint256 seizedAssets, uint256 repaidShares, bytes calldata data) external {
+        require(UtilsLib.exactlyOneZero(seizedAssets, repaidShares), ErrorsLib.InconsistentInput());
+
+        MORPHO.accrueInterest(marketParams());
+
+        Market memory market = MORPHO.market(ID);
+        Position memory position = MORPHO.position(ID, borrower);
+
+        uint256 collateralPrice = IOracle(PRE_LIQUIDATION_ORACLE).price();
+        uint256 borrowed = uint256(position.borrowShares).toAssetsUp(market.totalBorrowAssets, market.totalBorrowShares);
+        uint256 borrowThreshold =
+            uint256(position.collateral).mulDivDown(collateralPrice, ORACLE_PRICE_SCALE).wMulDown(PRE_LLTV);
+
+        require(borrowed > borrowThreshold, ErrorsLib.NotPreLiquidatablePosition());
+
+        if (seizedAssets > 0) {
+            uint256 seizedAssetsQuoted = seizedAssets.mulDivUp(collateralPrice, ORACLE_PRICE_SCALE);
+
+            repaidShares = seizedAssetsQuoted.wDivUp(PRE_LIQUIDATION_INCENTIVE_FACTOR).toSharesUp(
+                market.totalBorrowAssets, market.totalBorrowShares
+            );
+        } else {
+            seizedAssets = repaidShares.toAssetsDown(market.totalBorrowAssets, market.totalBorrowShares).wMulDown(
+                PRE_LIQUIDATION_INCENTIVE_FACTOR
+            ).mulDivDown(ORACLE_PRICE_SCALE, collateralPrice);
+        }
+
+        uint256 borrowerShares = position.borrowShares;
+        uint256 repayableShares = borrowerShares.wMulDown(CLOSE_FACTOR);
+        require(repaidShares <= repayableShares, ErrorsLib.PreLiquidationTooLarge(repaidShares, repayableShares));
+
+        bytes memory callbackData = abi.encode(seizedAssets, borrower, msg.sender, data);
+        (uint256 repaidAssets,) = MORPHO.repay(marketParams(), 0, repaidShares, borrower, callbackData);
+
+        emit EventsLib.PreLiquidate(ID, msg.sender, borrower, repaidAssets, repaidShares, seizedAssets);
+    }
+
+    /// @notice Morpho callback after repay call.
+    /// @dev During pre-liquidation, Morpho will call the `onMorphoRepay` callback function in `PreLiquidation` using the provided data.
+    /// This mechanism enables the withdrawal of the position’s collateral before the debt repayment occurs,
+    /// and can also trigger a pre-liquidator callback. The pre-liquidator callback can be used to swap
+    /// the seized collateral into the asset being repaid, facilitating liquidation without the need for a flashloan.
+    function onMorphoRepay(uint256 repaidAssets, bytes calldata callbackData) external {
+        require(msg.sender == address(MORPHO), ErrorsLib.NotMorpho());
+        (uint256 seizedAssets, address borrower, address liquidator, bytes memory data) =
+            abi.decode(callbackData, (uint256, address, address, bytes));
+
+        MORPHO.withdrawCollateral(marketParams(), seizedAssets, borrower, liquidator);
+
+        if (data.length > 0) {
+            IPreLiquidationCallback(liquidator).onPreLiquidate(repaidAssets, data);
+        }
+
+        ERC20(LOAN_TOKEN).safeTransferFrom(liquidator, address(this), repaidAssets);
+    }
+}

src/PreLiquidationFactory.sol

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity 0.8.27;
+
+import {IMorpho, Id} from "../lib/morpho-blue/src/interfaces/IMorpho.sol";
+import {PreLiquidation} from "./PreLiquidation.sol";
+import {IPreLiquidation, PreLiquidationParams} from "./interfaces/IPreLiquidation.sol";
+import {ErrorsLib} from "./libraries/ErrorsLib.sol";
+import {EventsLib} from "./libraries/EventsLib.sol";
+import {IPreLiquidationFactory} from "./interfaces/IPreLiquidationFactory.sol";
+
+/// @title PreLiquidationFactory
+/// @author Morpho Labs
+/// @custom:contact [email protected]
+/// @notice The Fixed LI, Fixed CF pre-liquidation factory contract for Morpho.
+contract PreLiquidationFactory is IPreLiquidationFactory {
+    /* IMMUTABLE */
+
+    /// @notice The address of the Morpho contract.
+    IMorpho public immutable MORPHO;
+
+    /* CONSTRUCTOR */
+
+    /// @param morpho The address of the Morpho contract.
+    constructor(address morpho) {
+        require(morpho != address(0), ErrorsLib.ZeroAddress());
+
+        MORPHO = IMorpho(morpho);
+    }
+
+    /* EXTERNAL */
+
+    /// @notice Creates a PreLiquidation contract.
+    /// @param id The Morpho market for PreLiquidations.
+    /// @param preLiquidationParams The PreLiquidation params for the PreLiquidation contract.
+    /// @dev Warning: This function will revert without data if the pre-liquidation already exists.
+    function createPreLiquidation(Id id, PreLiquidationParams calldata preLiquidationParams)
+        external
+        returns (IPreLiquidation)
+    {
+        IPreLiquidation preLiquidation =
+            IPreLiquidation(address(new PreLiquidation{salt: 0}(address(MORPHO), id, preLiquidationParams)));
+
+        emit EventsLib.CreatePreLiquidation(address(preLiquidation), id, preLiquidationParams);
+
+        return preLiquidation;
+    }
+}

src/interfaces/IPreLiquidation.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity >= 0.5.0;
+
+import {Id, IMorpho, MarketParams} from "../../lib/morpho-blue/src/interfaces/IMorpho.sol";
+
+/// @notice The pre-liquidation parameters are:
+///  - preLltv, the maximum LTV of a position before allowing pre-liquidation.
+///  - closeFactor, the maximum proportion of debt that can be pre-liquidated at once.
+///  - preLiquidationIncentiveFactor, the factor used to multiply repaid debt value to get the seized collateral value in a pre-liquidation.
+///  - preLiquidationOracle, the oracle used to assess whether or not a position can be preliquidated.
+struct PreLiquidationParams {
+    uint256 preLltv;
+    uint256 closeFactor;
+    uint256 preLiquidationIncentiveFactor;
+    address preLiquidationOracle;
+}
+
+interface IPreLiquidation {
+    function MORPHO() external view returns (IMorpho);
+
+    function ID() external view returns (Id);
+
+    function marketParams() external returns (MarketParams memory);
+
+    function preLiquidationParams() external view returns (PreLiquidationParams memory);
+
+    function preLiquidate(address borrower, uint256 seizedAssets, uint256 repaidShares, bytes calldata data) external;
+}

src/interfaces/IPreLiquidationCallback.sol

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+pragma solidity >= 0.5.0;
+
+/// @title IPreLiquidationCallback
+/// @notice Interface that "pre-liquidators" willing to use the pre-liquidation callback must implement.
+interface IPreLiquidationCallback {
+    /// @notice Callback called when a pre-liquidation occurs.
+    /// @dev The callback is called only if data is not empty.
+    /// @param repaidAssets The amount of repaid assets.
+    /// @param data Arbitrary data passed to the `preLiquidate` function.
+    function onPreLiquidate(uint256 repaidAssets, bytes calldata data) external;
+}