port onchain orders

Signed-off-by: Francesco <[email protected]>

src/EncodedCalls.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.4;
+pragma solidity 0.8.23;
 
 // Inheritances
 import {IEncodedCalls} from "./interfaces/IEncodedCalls.sol";

src/FloodPlain.sol

@@ -4,6 +4,7 @@ pragma solidity 0.8.23;
 // Inheritances
 import {IFloodPlain} from "./interfaces/IFloodPlain.sol";
 import {EncodedCalls} from "./EncodedCalls.sol";
+import {OnChainOrders} from "./OnChainOrders.sol";
 import {ReentrancyGuard} from "@openzeppelin/utils/ReentrancyGuard.sol";
 
 // Libraries
@@ -19,7 +20,7 @@ import {IZone} from "./interfaces/IZone.sol";
 import {IERC20} from "@openzeppelin/token/ERC20/IERC20.sol";
 import {ISignatureTransfer} from "permit2/src/interfaces/ISignatureTransfer.sol";
 
-contract FloodPlain is IFloodPlain, EncodedCalls, ReentrancyGuard {
+contract FloodPlain is IFloodPlain, EncodedCalls, OnChainOrders, ReentrancyGuard {
     using SafeERC20 for IERC20;
     using Address for address payable;
     using OrderHash for Order;

src/OnChainOrders.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.23;
+
+// Inheritances
+import {IOnChainOrders} from "./interfaces/IOnChainOrders.sol";
+import {IFloodPlain} from "./interfaces/IFloodPlain.sol";
+
+// Libraries
+import {OrderHash} from "./libraries/OrderHash.sol";
+
+abstract contract OnChainOrders is IOnChainOrders {
+    using OrderHash for IFloodPlain.Order;
+
+    function etchOrder(IFloodPlain.SignedOrder calldata orderWithSignature) external {
+        bytes32 orderHash = orderWithSignature.order.hash();
+        emit IOnChainOrders.OrderEtched(orderHash, orderWithSignature);
+    }
+}

src/interfaces/IOnChainOrders.sol

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.0;
+
+import {IFloodPlain} from "./IFloodPlain.sol";
+
+interface IOnChainOrders {
+    event OrderEtched(bytes32 indexed orderHash, IFloodPlain.SignedOrder orderWithSignature);
+
+    /**
+     * @notice Record an order on-chain for ease of use by other contracts.
+     *
+     * @param orderWithSignature The order and its signature to record.
+     */
+    function etchOrder(IFloodPlain.SignedOrder calldata orderWithSignature) external;
+}