Adding support for Velodrome V2 on Optimism (#739)

* Adding support for Velodrome V2 for Optimism

contracts/zero-ex/CHANGELOG.json

@@ -1,4 +1,12 @@
 [
+    {
+        "version": "0.46.0",
+        "changes": [
+            {
+                "note": "Add VelodromeV2 support on Optimism"
+            }
+        ]
+    },
     {
         "timestamp": 1689974915,
         "version": "0.45.1",

contracts/zero-ex/contracts/src/transformers/bridges/BridgeProtocols.sol

@@ -57,4 +57,5 @@ library BridgeProtocols {
     uint128 internal constant KYBERELASTIC = 33;
     uint128 internal constant BARTER = 34;
     uint128 internal constant TRADERJOEV2 = 35;
+    uint128 internal constant VELODROMEV2 = 36;
 }

contracts/zero-ex/contracts/src/transformers/bridges/OptimismBridgeAdapter.sol

@@ -26,6 +26,7 @@ import "./mixins/MixinNerve.sol";
 import "./mixins/MixinSolidly.sol";
 import "./mixins/MixinSynthetix.sol";
 import "./mixins/MixinUniswapV3.sol";
+import "./mixins/MixinVelodromeV2.sol";
 import "./mixins/MixinWOOFi.sol";
 import "./mixins/MixinZeroExBridge.sol";
 
@@ -39,6 +40,7 @@ contract OptimismBridgeAdapter is
     MixinNerve,
     MixinSynthetix,
     MixinUniswapV3,
+    MixinVelodromeV2,
     MixinSolidly,
     MixinWOOFi,
     MixinZeroExBridge
@@ -109,6 +111,11 @@ contract OptimismBridgeAdapter is
                 return (0, true);
             }
             boughtAmount = _tradeKyberElastic(sellToken, sellAmount, order.bridgeData);
+        } else if (protocolId == BridgeProtocols.VELODROMEV2) {
+            if (dryRun) {
+                return (0, true);
+            }
+            boughtAmount = _tradeVelodromeV2(sellToken, sellAmount, order.bridgeData);
         }
 
         emit BridgeFill(order.source, sellToken, buyToken, sellAmount, boughtAmount);

contracts/zero-ex/contracts/src/transformers/bridges/mixins/MixinVelodromeV2.sol

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+  Copyright 2023 ZeroEx Intl.
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+pragma solidity ^0.6.5;
+pragma experimental ABIEncoderV2;
+
+import "@0x/contracts-erc20/src/v06/LibERC20TokenV06.sol";
+import "@0x/contracts-erc20/src/IERC20Token.sol";
+
+interface IVelodromeV2Router {
+    struct Route {
+        address from;
+        address to;
+        bool stable;
+        address factory;
+    }
+
+    /// @notice Swap one token for another
+    /// @param amountIn     Amount of token in
+    /// @param amountOutMin Minimum amount of desired token received
+    /// @param routes       Array of trade routes used in the swap
+    /// @param to           Recipient of the tokens received
+    /// @param deadline     Deadline to receive tokens
+    /// @return amounts     Array of amounts returned per route
+    function swapExactTokensForTokens(
+        uint256 amountIn,
+        uint256 amountOutMin,
+        Route[] calldata routes,
+        address to,
+        uint256 deadline
+    ) external returns (uint256[] memory amounts);
+}
+
+contract MixinVelodromeV2 {
+    using LibERC20TokenV06 for IERC20Token;
+
+    function _tradeVelodromeV2(
+        IERC20Token sellToken,
+        uint256 sellAmount,
+        bytes memory bridgeData
+    ) internal returns (uint256 boughtAmount) {
+        (IVelodromeV2Router router, IVelodromeV2Router.Route[] memory routes) = abi.decode(
+            bridgeData,
+            (IVelodromeV2Router, IVelodromeV2Router.Route[])
+        );
+        sellToken.approveIfBelow(address(router), sellAmount);
+
+        uint256[] memory amounts = router.swapExactTokensForTokens(
+            sellAmount,
+            1,
+            routes,
+            address(this),
+            block.timestamp + 1
+        );
+
+        return amounts[amounts.length - 1];
+    }
+}

packages/contract-addresses/CHANGELOG.json

@@ -1,4 +1,12 @@
 [
+	{
+        "version": "8.10.0",
+        "changes": [
+            {
+                "note": "Add VelodromeV2 support on Optimism"
+            }
+        ]
+    },
 	{
 		"version": "8.9.0",
 		"changes": [

packages/contract-addresses/addresses.json

@@ -225,7 +225,7 @@
             "wethTransformer": "0x02ce7af6520e2862f961f5d7eda746642865179c",
             "payTakerTransformer": "0xa6c3ca183a67fcb4299fb4199c12ca74874ca489",
             "affiliateFeeTransformer": "0x3102aea537ecb6f164550b094663c82a8c53a972",
-            "fillQuoteTransformer": "0xd140adb61d4e3e3978d4f32ac6b92240ff6e3a6e",
+            "fillQuoteTransformer": "0x521f3184ab27abde4a34e744a908b1a08dc8ef91",
             "positiveSlippageFeeTransformer": "0x9a4947d3fb77a7afc2c9cd6714bbae96dddde059"
         }
     },

packages/protocol-utils/CHANGELOG.json

@@ -1,4 +1,12 @@
 [
+	{
+        "version": "11.23.0",
+        "changes": [
+            {
+                "note": "Add VelodromeV2 support on Optimism"
+            }
+        ]
+    },
 	{
 		"timestamp": 1689974915,
 		"version": "11.22.4",

packages/protocol-utils/src/transformer_utils.ts

@@ -166,6 +166,7 @@ export enum BridgeProtocol {
     KyberElastic,
     Barter,
     TraderJoeV2,
+    VelodromeV2,
 }
 
 /**