feat: UniswapXFiller skeleton

foundry/src/uniswap_x/IStructs.sol

@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.26;
+
+/// @dev external struct including a generic encoded order and swapper signature
+///  The order bytes will be parsed and mapped to a ResolvedOrder in the concrete reactor contract
+
+struct SignedOrder {
+    bytes order;
+    bytes sig;
+}
+
+struct OrderInfo {
+    // The address of the reactor that this order is targeting
+    // Note that this must be included in every order so the swapper
+    // signature commits to the specific reactor that they trust to fill their order properly
+    address reactor;
+    // The address of the user which created the order
+    // Note that this must be included so that order hashes are unique by swapper
+    address swapper;
+    // The nonce of the order, allowing for signature replay protection and cancellation
+    uint256 nonce;
+    // The timestamp after which this order is no longer valid
+    uint256 deadline;
+    // Custom validation contract
+    address additionalValidationContract;
+    // Encoded validation params for additionalValidationContract
+    bytes additionalValidationData;
+}
+
+/// @dev tokens that need to be sent from the swapper in order to satisfy an order
+struct InputToken {
+    address token;
+    uint256 amount;
+    // Needed for dutch decaying inputs
+    uint256 maxAmount;
+}
+
+/// @dev tokens that need to be received by the recipient in order to satisfy an order
+struct OutputToken {
+    address token;
+    uint256 amount;
+    address recipient;
+}
+/// @dev generic concrete order that specifies exact tokens which need to be sent and received
+
+struct ResolvedOrder {
+    OrderInfo info;
+    InputToken input;
+    OutputToken[] outputs;
+    bytes sig;
+    bytes32 hash;
+}
+
+struct DutchOutput {
+    address token;
+    uint256 startAmount;
+    uint256 endAmount;
+    address recipient;
+}
+
+struct DutchInput {
+    address token;
+    uint256 startAmount;
+    uint256 endAmount;
+}
+
+struct ExclusiveDutchOrder {
+    OrderInfo info;
+    uint256 decayStartTime;
+    uint256 decayEndTime;
+    address exclusiveFiller;
+    uint256 exclusivityOverrideBps;
+    DutchInput input;
+    DutchOutput[] outputs;
+}
+
+struct DutchOrder {
+    OrderInfo info;
+    uint256 decayStartTime;
+    uint256 decayEndTime;
+    address exclusiveFiller;
+    uint256 exclusivityOverrideBps;
+    DutchInput input;
+    DutchOutput[] outputs;
+}
+
+struct CosignerData {
+    // The time at which the DutchOutputs start decaying
+    uint256 decayStartTime;
+    // The time at which price becomes static
+    uint256 decayEndTime;
+    // The address who has exclusive rights to the order until decayStartTime
+    address exclusiveFiller;
+    // The amount in bps that a non-exclusive filler needs to improve the outputs by to be able to fill the order
+    uint256 exclusivityOverrideBps;
+    // The tokens that the swapper will provide when settling the order
+    uint256 inputAmount;
+    // The tokens that must be received to satisfy the order
+    uint256[] outputAmounts;
+}
+
+struct V2DutchOrder {
+    // generic order information
+    OrderInfo info;
+    // The address which must cosign the full order
+    address cosigner;
+    // The tokens that the swapper will provide when settling the order
+    DutchInput baseInput;
+    // The tokens that must be received to satisfy the order
+    DutchOutput[] baseOutputs;
+    // signed over by the cosigner
+    CosignerData cosignerData;
+    // signature from the cosigner over (orderHash || cosignerData)
+    bytes cosignature;
+}