Cross-Currency Rollover

contracts/errors/Lending.sol

@@ -276,6 +276,73 @@ error OCM_CollateralMismatch(
  */
 error OCM_LenderIsBorrower();
 
+// ================================== CROSS CURRENCY ROLLOVER ====================================
+/// @notice All errors prefixed with CCR_, to separate from other contracts in the protocol.
+
+/**
+ * @notice Only the holder of the borrowerNote can rollover their loan.
+ */
+error CCR_CallerNotBorrower();
+
+/**
+ * @notice Contract is paused, rollover operations are blocked.
+ */
+error CCR_Paused();
+
+/**
+ * @notice The rollover contract is already in the specified pause state.
+ */
+error CCR_StateAlreadySet();
+
+/**
+ * @notice Ensure valid loan state for loan lifecycle operations.
+ *
+ * @param state                   Current state of a loan according to LoanState enum.
+ */
+error CCR_InvalidState(uint8 state);
+
+/**
+ * @notice Signer is attempting to take the wrong side of the loan.
+ *
+ * @param signer                   The address of the external signer.
+ */
+error CCR_SideMismatch(address signer);
+
+/**
+ * @notice New currency should not match original loan currency.
+ *
+ * @param oldCurrency               The currency of the active loan.
+ * @param newCurrency               The currency of the new loan.
+ */
+error CCR_SameCurrency(address oldCurrency, address newCurrency);
+
+/**
+ * @notice New collateral does not match for a loan migration request.
+ *
+ * @param oldCollateralAddress       The address of the active loan's collateral.
+ * @param newCollateralAddress       The token ID of the active loan's collateral.
+ * @param oldCollateralId            The address of the new loan's collateral.
+ * @param newCollateralId            The token ID of the new loan's collateral.
+ */
+error CCR_CollateralMismatch(
+    address oldCollateralAddress,
+    uint256 oldCollateralId,
+    address newCollateralAddress,
+    uint256 newCollateralId
+);
+
+/**
+ * @notice The lender specified for a migration cannot be the current borrower.
+ */
+error CCR_LenderIsBorrower();
+
+/**
+ * @notice Zero address passed in where not allowed.
+ *
+ * @param addressType               The name of the parameter for which a zero address was provided.
+ */
+error CCR_ZeroAddress(string addressType);
+
 // ================================= REFINANCE CONTROLLER =====================================
 /// @notice All errors prefixed with REFI_, to separate from other contracts in the protocol.
 

contracts/interfaces/ICrossCurrencyRollover.sol

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.18;
+
+import "../libraries/LoanLibrary.sol";
+import "../libraries/OriginationLibrary.sol";
+
+import "./IOriginationController.sol";
+
+interface ICrossCurrencyRollover {
+    // =========================== EVENTS ==========================
+    event PausedStateChanged(bool isPaused);
+    event CurrencyRollover(address indexed lender, address indexed borrower, uint256 collateralTokenId, uint256 newLoanId);
+
+    // ================== CROSS CURRENCY ROLLOVER ==================
+    function rolloverCrossCurrencyLoan(
+        uint256 oldLoanId,
+        LoanLibrary.LoanTerms calldata loanTerms,
+        address lender,
+        IOriginationController.Signature calldata sig,
+        IOriginationController.SigProperties calldata sigProperties,
+        LoanLibrary.Predicate[] calldata itemPredicates,
+        OriginationLibrary.SwapParameters calldata swapParams
+    ) external;
+
+    // ======================== OWNER OPS =========================
+    function pause(bool _pause) external;
+}

contracts/interfaces/IOriginationController.sol

@@ -2,37 +2,18 @@
 
 pragma solidity 0.8.18;
 
+import "./IOriginationControllerBase.sol";
+
 import "../libraries/LoanLibrary.sol";
 
-interface IOriginationController {
+interface IOriginationController is IOriginationControllerBase {
     // ============= Data Types =============
 
     struct BorrowerData {
         address borrower;
         bytes callbackData;
     }
 
-    struct SigProperties {
-        uint160 nonce;
-        uint96 maxUses;
-    }
-
-    enum Side {
-        BORROW,
-        LEND
-    }
-
-    struct Signature {
-        uint8 v;
-        bytes32 r;
-        bytes32 s;
-        bytes extraData;
-    }
-
-    // ================ Events ================
-
-    event Approval(address indexed owner, address indexed signer, bool isApproved);
-
     // ============= Loan Origination =============
 
     function initializeLoan(
@@ -52,31 +33,4 @@ interface IOriginationController {
         SigProperties calldata sigProperties,
         LoanLibrary.Predicate[] calldata itemPredicates
     ) external returns (uint256 newLoanId);
-
-    // ================ Permission Management ================
-
-    function approve(address signer, bool approved) external;
-
-    function isApproved(address owner, address signer) external returns (bool);
-
-    function isSelfOrApproved(address target, address signer) external returns (bool);
-
-    // ============== Signature Verification ==============
-
-    function recoverTokenSignature(
-        LoanLibrary.LoanTerms calldata loanTerms,
-        Signature calldata sig,
-        SigProperties calldata sigProperties,
-        Side side,
-        address signingCounterparty
-    ) external view returns (bytes32 sighash, address signer);
-
-    function recoverItemsSignature(
-        LoanLibrary.LoanTerms calldata loanTerms,
-        Signature calldata sig,
-        LoanLibrary.Predicate[] calldata itemPredicates,
-        SigProperties calldata sigProperties,
-        Side side,
-        address signingCounterparty
-    ) external view returns (bytes32 sighash, address signer);
 }

contracts/interfaces/IOriginationControllerBase.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.8.18;
+
+import "../libraries/LoanLibrary.sol";
+
+interface IOriginationControllerBase {
+    // ============= Data Types =============
+
+    struct SigProperties {
+        uint160 nonce;
+        uint96 maxUses;
+    }
+
+    enum Side {
+        BORROW,
+        LEND
+    }
+
+    struct Signature {
+        uint8 v;
+        bytes32 r;
+        bytes32 s;
+        bytes extraData;
+    }
+
+    // ================ Events ================
+
+    event Approval(address indexed owner, address indexed signer, bool isApproved);
+
+    // ================ Permission Management ================
+
+    function approve(address signer, bool approved) external;
+
+    function isApproved(address owner, address signer) external returns (bool);
+
+    function isSelfOrApproved(address target, address signer) external returns (bool);
+
+    // ============== Signature Verification ==============
+
+    function recoverTokenSignature(
+        LoanLibrary.LoanTerms calldata loanTerms,
+        Signature calldata sig,
+        SigProperties calldata sigProperties,
+        Side side,
+        address signingCounterparty
+    ) external view returns (bytes32 sighash, address signer);
+
+    function recoverItemsSignature(
+        LoanLibrary.LoanTerms calldata loanTerms,
+        Signature calldata sig,
+        LoanLibrary.Predicate[] calldata itemPredicates,
+        SigProperties calldata sigProperties,
+        Side side,
+        address signingCounterparty
+    ) external view returns (bytes32 sighash, address signer);
+}

contracts/libraries/OriginationLibrary.sol

@@ -41,6 +41,11 @@ library OriginationLibrary {
         RolloverAmounts migrationAmounts;
     }
 
+    struct SwapParameters {
+        uint256 minAmountOut;
+        uint24 poolFeeTier;
+    }
+
     // ======================================= CONSTANTS ==============================================
 
     /// @notice EIP712 type hash for bundle-based signatures.