Feat/axelar proxy

script/test/Arbitrum/DeployProxy.s.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity 0.8.16;
+
+import { AxelarProxy } from "src/AxelarProxy.sol";
+
+import "forge-std/Script.sol";
+import { Math } from "src/utils/Math.sol";
+
+/**
+ * @dev Run
+ *      `source .env && forge script script/test/Arbitrum/DeployProxy.s.sol:DeployProxyScript --rpc-url $ARBITRUM_RPC_URL  --private-key $PRIVATE_KEY —optimize —optimizer-runs 200 --verify --etherscan-api-key $ARBISCAN_KEY --slow --broadcast`
+ * @dev Optionally can change `--with-gas-price` to something more reasonable
+ */
+contract DeployProxyScript is Script {
+    address private devOwner = 0x552acA1343A6383aF32ce1B7c7B1b47959F7ad90;
+
+    address private gateway = 0xe432150cce91c13a887f7D836923d5597adD8E31;
+
+    string private sourceChain = "Polygon";
+    string private sourceAddress = "0x552acA1343A6383aF32ce1B7c7B1b47959F7ad90";
+
+    function run() external {
+        vm.startBroadcast();
+
+        AxelarProxy proxy = new AxelarProxy(gateway);
+
+        vm.stopBroadcast();
+    }
+}

script/test/Polygon/SendMessageToArbitrum.s.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity 0.8.16;
+
+import { ERC20 } from "src/base/Cellar.sol";
+import { AxelarProxy } from "src/AxelarProxy.sol";
+import { MockSommelier } from "src/mocks/MockSommelier.sol";
+
+import "forge-std/Script.sol";
+import { Math } from "src/utils/Math.sol";
+
+interface Gateway {
+    function callContract(string memory dest, string memory destAddress, bytes memory payload) external;
+}
+
+/**
+ * @dev Run
+ *      `source .env && forge script script/test/Polygon/SendMessageToArbitrum.s.sol:SendMessageToArbitrumScript --rpc-url $MATIC_RPC_URL  --private-key $PRIVATE_KEY —optimize —optimizer-runs 200 --verify --etherscan-api-key $POLYGONSCAN_KEY --slow --broadcast`
+ * @dev Optionally can change `--with-gas-price` to something more reasonable
+ */
+contract SendMessageToArbitrumScript is Script {
+    address private devOwner = 0x552acA1343A6383aF32ce1B7c7B1b47959F7ad90;
+
+    Gateway private gateway = Gateway(0x6f015F16De9fC8791b234eF68D486d2bF203FBA8);
+
+    string private destChain = "arbitrum";
+    string private destAddress = "0x2aF45D06C3d06af1E6B8Bc3f90c5a8DB0E5aa729";
+
+    address private usdcOnArb = 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8;
+
+    MockSommelier private mockSomm;
+
+    function run() external {
+        vm.startBroadcast();
+
+        mockSomm = new MockSommelier();
+
+        mockSomm.sendMessage{ value: 10 ether }(destAddress, usdcOnArb, devOwner, 777);
+
+        vm.stopBroadcast();
+    }
+}

src/AxelarProxy.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity 0.8.16;
+
+import { AxelarExecutable } from "lib/axelar-gmp-sdk-solidity/contracts/executable/AxelarExecutable.sol";
+import { Address } from "@openzeppelin/contracts/utils/Address.sol";
+
+contract AxelarProxy is AxelarExecutable {
+    using Address for address;
+
+    event LogicCallEvent(address target, bytes callData);
+
+    error AxelarProxy__WrongSource();
+    error AxelarProxy__NoTokens();
+
+    bytes32 public constant SOMMELIER_CHAIN_HASH = keccak256(bytes("sommelier"));
+
+    constructor(address gateway_) AxelarExecutable(gateway_) {}
+
+    /**
+     * @notice Execution logic.
+     * @dev Verifies message is from Sommelier, otherwise reverts.
+     */
+    function _execute(string calldata sourceChain, string calldata, bytes calldata payload) internal override {
+        // Validate Source Chain
+        if (keccak256(bytes(sourceChain)) != SOMMELIER_CHAIN_HASH) revert AxelarProxy__WrongSource();
+
+        // Execute function call.
+        (address target, bytes memory callData) = abi.decode(payload, (address, bytes));
+        target.functionCall(callData);
+
+        emit LogicCallEvent(target, callData);
+    }
+
+    /**
+     * @notice Execution with token logic.
+     * @dev Not supported.
+     */
+    function _executeWithToken(
+        string calldata,
+        string calldata,
+        bytes calldata,
+        string calldata,
+        uint256
+    ) internal pure override {
+        revert AxelarProxy__NoTokens();
+    }
+}

src/mocks/MockSommelier.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity 0.8.16;
+
+import { Address } from "@openzeppelin/contracts/utils/Address.sol";
+import { ERC20 } from "src/base/Cellar.sol";
+import { IAxelarGateway } from "lib/axelar-gmp-sdk-solidity/contracts/interfaces/IAxelarGateway.sol";
+import { IAxelarGasService } from "lib/axelar-gmp-sdk-solidity/contracts/interfaces/IAxelarGasService.sol";
+
+contract MockSommelier {
+    using Address for address;
+
+    address constant ARB_USDC = 0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8;
+    IAxelarGateway private axelarGateway = IAxelarGateway(0x6f015F16De9fC8791b234eF68D486d2bF203FBA8);
+    IAxelarGasService private axelarGasService = IAxelarGasService(0x2d5d7d31F671F86C782533cc367F14109a082712);
+    string private destChain = "arbitrum";
+
+    function sendMessage(string memory target, address token, address spender, uint256 amount) external payable {
+        bytes memory payload = abi.encodeWithSelector(ERC20.approve.selector, spender, amount);
+        payload = abi.encode(token, payload);
+
+        // Pay gas.
+        axelarGasService.payNativeGasForContractCall{ value: msg.value }(
+            msg.sender,
+            destChain,
+            target,
+            payload,
+            msg.sender
+        );
+        // Send GMP.
+        axelarGateway.callContract(destChain, target, payload);
+    }
+}