refactor EIP712

src/MorphoGetters.sol

@@ -37,7 +37,7 @@ abstract contract MorphoGetters is IMorphoGetters, MorphoInternal {
 
     /// @notice Returns the domain separator of the EIP712.
     function DOMAIN_SEPARATOR() external view returns (bytes32) {
-        return _DOMAIN_SEPARATOR;
+        return _domainSeparator();
     }
 
     /// @notice Returns the e-mode category ID of Morpho on the Aave protocol.

src/MorphoInternal.sol

@@ -49,6 +49,19 @@ abstract contract MorphoInternal is MorphoStorage {
 
     /// INTERNAL ///
 
+    /// @dev Dynamically computed to use the root proxy address in a delegate call.
+    function _domainSeparator() internal view returns (bytes32) {
+        return keccak256(
+            abi.encode(
+                Constants.EIP712_DOMAIN_TYPEHASH,
+                keccak256(bytes(Constants.EIP712_NAME)),
+                keccak256(bytes(Constants.EIP712_VERSION)),
+                block.chainid,
+                address(this)
+            )
+        );
+    }
+
     /// @dev Creates a new market for the `underlying` token with a given `reserveFactor` (in bps) and a given `p2pIndexCursor` (in bps).
     function _createMarket(address underlying, uint16 reserveFactor, uint16 p2pIndexCursor) internal {
         if (underlying == address(0)) revert Errors.AddressIsZero();
@@ -141,7 +154,7 @@ abstract contract MorphoInternal is MorphoStorage {
 
     /// @dev Returns the hash of the EIP712 typed data.
     function _hashEIP712TypedData(bytes32 structHash) internal view returns (bytes32) {
-        return keccak256(abi.encodePacked(Constants.EIP712_MSG_PREFIX, _DOMAIN_SEPARATOR, structHash));
+        return keccak256(abi.encodePacked(Constants.EIP712_MSG_PREFIX, _domainSeparator(), structHash));
     }
 
     /// @notice Approves a `manager` to borrow/withdraw on behalf of the sender.

src/MorphoStorage.sol

@@ -21,7 +21,6 @@ abstract contract MorphoStorage is Initializable, Ownable2StepUpgradeable {
 
     IPool internal immutable _POOL; // The address of the pool.
     IPoolAddressesProvider internal immutable _ADDRESSES_PROVIDER; // The address of the pool addresses provider.
-    bytes32 internal immutable _DOMAIN_SEPARATOR; // The domain separator as part of the EIP712.
     uint8 internal immutable _E_MODE_CATEGORY_ID; // The e-mode category of the deployed Morpho.
 
     /// STORAGE ///
@@ -51,16 +50,6 @@ abstract contract MorphoStorage is Initializable, Ownable2StepUpgradeable {
         _ADDRESSES_PROVIDER = IPoolAddressesProvider(addressesProvider);
         _POOL = IPool(_ADDRESSES_PROVIDER.getPool());
 
-        _DOMAIN_SEPARATOR = keccak256(
-            abi.encode(
-                Constants.EIP712_DOMAIN_TYPEHASH,
-                keccak256(bytes(Constants.EIP712_NAME)),
-                keccak256(bytes(Constants.EIP712_VERSION)),
-                block.chainid,
-                address(this)
-            )
-        );
-
         _E_MODE_CATEGORY_ID = eModeCategoryId;
     }
 }