feat(contracts): ValueRouter

solidity/contracts/hooks/OPL2ToL1Hook.sol

@@ -67,8 +67,12 @@
         bytes calldata metadata,
         bytes calldata message
     ) internal view override returns (uint256) {
+        bytes memory metadataWithGasLimit = metadata.overrideGasLimit(
+            MIN_GAS_LIMIT
+        );
         return
-            metadata.msgValue(0) + childHook.quoteDispatch(metadata, message);
+            metadata.msgValue(0) +
+            childHook.quoteDispatch(metadataWithGasLimit, message);
     }
 
     // ============ Internal functions ============
@@ -83,9 +87,12 @@
             (message.id(), metadata.msgValue(0))
         );
 
+        bytes memory metadataWithGasLimit = metadata.overrideGasLimit(
+            MIN_GAS_LIMIT
+        );
         childHook.postDispatch{
-            value: childHook.quoteDispatch(metadata, message)
-        }(metadata, message);
+            value: childHook.quoteDispatch(metadataWithGasLimit, message)
+        }(metadataWithGasLimit, message);
         l2Messenger.sendMessage{value: metadata.msgValue(0)}(
             TypeCasts.bytes32ToAddress(ism),
             payload,

solidity/contracts/hooks/libs/StandardHookMetadata.sol

@@ -165,4 +165,45 @@ library StandardHookMetadata {
     ) internal pure returns (bytes memory) {
         return formatMetadata(uint256(0), uint256(0), _refundAddress, "");
     }
+
+    /**
+     * @notice Overrides the msg.value in the metadata.
+     * @param _metadata encoded standard hook metadata.
+     * @param _msgValue msg.value for the message.
+     * @return encoded standard hook metadata.
+     */
+    function overrideMsgValue(
+        bytes calldata _metadata,
+        uint256 _msgValue
+    ) internal view returns (bytes memory) {
+        return
+            formatMetadata(
+                _msgValue,
+                gasLimit(_metadata, 0),
+                refundAddress(_metadata, msg.sender),
+                getCustomMetadata(_metadata)
+            );
+    }
+
+    /**
+     * @notice Overrides the gas limit in the metadata if _gasLimit is higher than the current gas limit.
+     * @param _metadata encoded standard hook metadata.
+     * @param _gasLimit gas limit for the message.
+     * @return encoded standard hook metadata.
+     */
+    function overrideGasLimit(
+        bytes calldata _metadata,
+        uint256 _gasLimit
+    ) internal view returns (bytes memory) {
+        if (gasLimit(_metadata, 0) < _gasLimit) {
+            return
+                formatMetadata(
+                    msgValue(_metadata, 0),
+                    _gasLimit,
+                    refundAddress(_metadata, msg.sender),
+                    getCustomMetadata(_metadata)
+                );
+        }
+        return _metadata;
+    }
 }

solidity/contracts/token/HypNative.sol

@@ -1,14 +1,29 @@
-// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT OR Apache-2.0
 pragma solidity >=0.8.0;
 
+/*@@@@@@@       @@@@@@@@@
+ @@@@@@@@@       @@@@@@@@@
+  @@@@@@@@@       @@@@@@@@@
+   @@@@@@@@@       @@@@@@@@@
+    @@@@@@@@@@@@@@@@@@@@@@@@@
+     @@@@@  HYPERLANE  @@@@@@@
+    @@@@@@@@@@@@@@@@@@@@@@@@@
+   @@@@@@@@@       @@@@@@@@@
+  @@@@@@@@@       @@@@@@@@@
+ @@@@@@@@@       @@@@@@@@@
+@@@@@@@@@       @@@@@@@@*/
+
+// ============ Internal Imports ============
 import {TokenRouter} from "./libs/TokenRouter.sol";
-import {TokenMessage} from "./libs/TokenMessage.sol";
+import {StandardHookMetadata} from "../hooks/libs/StandardHookMetadata.sol";
+
+// ============ External Imports ============
 import {Address} from "@openzeppelin/contracts/utils/Address.sol";
 
 /**
- * @title Hyperlane Native Token Router that extends ERC20 with remote transfer functionality.
+ * @title HypNative
  * @author Abacus Works
- * @dev Supply on each chain is not constant but the aggregate supply across all chains is.
+ * @notice This contract facilitates the transfer of value between chains using value transfer hooks
  */
 contract HypNative is TokenRouter {
     /**
@@ -17,90 +32,119 @@
      * @param amount The amount of native tokens donated.
      */
     event Donation(address indexed sender, uint256 amount);
+    // ============ Errors ============
+
+    error InsufficientValue(uint256 requiredValue, uint256 providedValue);
 
     constructor(address _mailbox) TokenRouter(_mailbox) {}
 
+    // ============ Initialization ============
+
     /**
-     * @notice Initializes the Hyperlane router
-     * @param _hook The post-dispatch hook contract.
-       @param _interchainSecurityModule The interchain security module contract.
-       @param _owner The this contract.
+     * @notice Initializes the contract
+     * @param _valuehook The address of the value transfer hook
+     * @param _interchainSecurityModule The address of the interchain security module
+     * @param _owner The owner of the contract
      */
     function initialize(
-        address _hook,
+        address _valuehook,
         address _interchainSecurityModule,
         address _owner
     ) public initializer {
-        _MailboxClient_initialize(_hook, _interchainSecurityModule, _owner);
+        _MailboxClient_initialize(
+            _valuehook,
+            _interchainSecurityModule,
+            _owner
+        );
     }
 
-    /**
-     * @inheritdoc TokenRouter
-     * @dev uses (`msg.value` - `_amount`) as hook payment and `msg.sender` as refund address.
-     */
-    function transferRemote(
-        uint32 _destination,
-        bytes32 _recipient,
-        uint256 _amount
-    ) external payable virtual override returns (bytes32 messageId) {
-        require(msg.value >= _amount, "Native: amount exceeds msg.value");
-        uint256 _hookPayment = msg.value - _amount;
-        return _transferRemote(_destination, _recipient, _amount, _hookPayment);
-    }
+    // ============ External Functions ============
 
     /**
      * @inheritdoc TokenRouter
-     * @dev uses (`msg.value` - `_amount`) as hook payment.
+     * @dev use _hook with caution, make sure that this hook can handle msg.value transfer using the metadata.msgValue()
      */
     function transferRemote(
         uint32 _destination,
         bytes32 _recipient,
         uint256 _amount,
         bytes calldata _hookMetadata,
         address _hook
-    ) external payable virtual override returns (bytes32 messageId) {
-        require(msg.value >= _amount, "Native: amount exceeds msg.value");
-        uint256 _hookPayment = msg.value - _amount;
+    ) public payable virtual override returns (bytes32 messageId) {
+        uint256 quote = _GasRouter_quoteDispatch(
+            _destination,
+            _hookMetadata,
+            _hook
+        );
+
+        bytes memory hookMetadata = StandardHookMetadata.overrideMsgValue(
+            _hookMetadata,
+            _amount
+        );
+
         return
             _transferRemote(
                 _destination,
                 _recipient,
                 _amount,
-                _hookPayment,
-                _hookMetadata,
+                _amount + quote,
+                hookMetadata,
                 _hook
             );
     }
 
-    function balanceOf(
-        address _account
-    ) external view override returns (uint256) {
-        return _account.balance;
+    /// @inheritdoc TokenRouter
+    function transferRemote(
+        uint32 _destination,
+        bytes32 _recipient,
+        uint256 _amount
+    ) external payable virtual override returns (bytes32 messageId) {
+        bytes calldata emptyBytes;
+        assembly {
+            emptyBytes.length := 0
+            emptyBytes.offset := 0
+        }
+        return
+            transferRemote(
+                _destination,
+                _recipient,
+                _amount,
+                emptyBytes,
+                address(hook)
+            );
     }
 
+    // ============ Internal Functions ============
+
     /**
      * @inheritdoc TokenRouter
-     * @dev No-op because native amount is transferred in `msg.value`
-     * @dev Compiler will not include this in the bytecode.
+     * @dev No token metadata is needed for value transfers
      */
     function _transferFromSender(
         uint256
     ) internal pure override returns (bytes memory) {
-        return bytes(""); // no metadata
+        return bytes(""); // no token metadata
     }
 
     /**
-     * @dev Sends `_amount` of native token to `_recipient` balance.
      * @inheritdoc TokenRouter
+     * @dev Sends the value to the recipient
      */
     function _transferTo(
         address _recipient,
         uint256 _amount,
-        bytes calldata // no metadata
+        bytes calldata // no token metadata
     ) internal virtual override {
         Address.sendValue(payable(_recipient), _amount);
     }
 
+    /// @inheritdoc TokenRouter
+    function balanceOf(
+        address _account
+    ) external view override returns (uint256) {
+        return _account.balance;
+    }
+
     receive() external payable {
         emit Donation(msg.sender, msg.value);
     }

solidity/contracts/token/HypNativeCollateral.sol

@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity >=0.8.0;
+
+import {TokenRouter} from "./libs/TokenRouter.sol";
+import {TokenMessage} from "./libs/TokenMessage.sol";
+import {Address} from "@openzeppelin/contracts/utils/Address.sol";
+
+/**
+ * @title Hyperlane Native Token Router that extends ERC20 with remote transfer functionality.
+ * @author Abacus Works
+ * @dev Supply on each chain is not constant but the aggregate supply across all chains is.
+ */
+contract HypNativeCollateral is TokenRouter {
+    /**
+     * @dev Emitted when native tokens are donated to the contract.
+     * @param sender The address of the sender.
+     * @param amount The amount of native tokens donated.
+     */
+    event Donation(address indexed sender, uint256 amount);
+
+    constructor(address _mailbox) TokenRouter(_mailbox) {}
+
+    /**
+     * @notice Initializes the Hyperlane router
+     * @param _hook The post-dispatch hook contract.
+     *    @param _interchainSecurityModule The interchain security module contract.
+     *    @param _owner The this contract.
+     */
+    function initialize(
+        address _hook,
+        address _interchainSecurityModule,
+        address _owner
+    ) public initializer {
+        _MailboxClient_initialize(_hook, _interchainSecurityModule, _owner);
+    }
+
+    /**
+     * @inheritdoc TokenRouter
+     * @dev uses (`msg.value` - `_amount`) as hook payment and `msg.sender` as refund address.
+     */
+    function transferRemote(
+        uint32 _destination,
+        bytes32 _recipient,
+        uint256 _amount
+    ) external payable virtual override returns (bytes32 messageId) {
+        require(msg.value >= _amount, "Native: amount exceeds msg.value");
+        uint256 _hookPayment = msg.value - _amount;
+        return _transferRemote(_destination, _recipient, _amount, _hookPayment);
+    }
+
+    /**
+     * @inheritdoc TokenRouter
+     * @dev uses (`msg.value` - `_amount`) as hook payment.
+     */
+    function transferRemote(
+        uint32 _destination,
+        bytes32 _recipient,
+        uint256 _amount,
+        bytes calldata _hookMetadata,
+        address _hook
+    ) external payable virtual override returns (bytes32 messageId) {
+        require(msg.value >= _amount, "Native: amount exceeds msg.value");
+        uint256 _hookPayment = msg.value - _amount;
+        return
+            _transferRemote(
+                _destination,
+                _recipient,
+                _amount,
+                _hookPayment,
+                _hookMetadata,
+                _hook
+            );
+    }
+
+    function balanceOf(
+        address _account
+    ) external view override returns (uint256) {
+        return _account.balance;
+    }
+
+    /**
+     * @inheritdoc TokenRouter
+     * @dev No-op because native amount is transferred in `msg.value`
+     * @dev Compiler will not include this in the bytecode.
+     */
+    function _transferFromSender(
+        uint256
+    ) internal pure override returns (bytes memory) {
+        return bytes(""); // no metadata
+    }
+
+    /**
+     * @dev Sends `_amount` of native token to `_recipient` balance.
+     * @inheritdoc TokenRouter
+     */
+    function _transferTo(
+        address _recipient,
+        uint256 _amount,
+        bytes calldata // no metadata
+    ) internal virtual override {
+        Address.sendValue(payable(_recipient), _amount);
+    }
+
+    receive() external payable {
+        emit Donation(msg.sender, msg.value);
+    }
+}