From 0405189fcd9e9884c70ea82b569784161256d532 Mon Sep 17 00:00:00 2001
From: Stanley <gw.stanley.szeto@gmail.com>
Date: Tue, 8 Oct 2024 12:56:04 -0400
Subject: [PATCH 1/2] forge install: axelar-gmp-sdk-solidity

v5.10.0
---
 .gitmodules                 | 3 +++
 lib/axelar-gmp-sdk-solidity | 1 +
 2 files changed, 4 insertions(+)
 create mode 160000 lib/axelar-gmp-sdk-solidity

diff --git a/.gitmodules b/.gitmodules
index 86d572d1..059299e4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -19,3 +19,6 @@
 [submodule "lib/PermitC"]
 	path = lib/PermitC
 	url = https://github.com/limitbreakinc/PermitC
+[submodule "lib/axelar-gmp-sdk-solidity"]
+	path = lib/axelar-gmp-sdk-solidity
+	url = https://github.com/axelarnetwork/axelar-gmp-sdk-solidity
diff --git a/lib/axelar-gmp-sdk-solidity b/lib/axelar-gmp-sdk-solidity
new file mode 160000
index 00000000..3157ba4f
--- /dev/null
+++ b/lib/axelar-gmp-sdk-solidity
@@ -0,0 +1 @@
+Subproject commit 3157ba4f704de408e356ad8236b5d81bbc82d7cb

From 9c85757e444ff91e3c5a19799ede921d36062f62 Mon Sep 17 00:00:00 2001
From: Stanley <gw.stanley.szeto@gmail.com>
Date: Tue, 8 Oct 2024 13:39:20 -0400
Subject: [PATCH 2/2] PoC setup of CrossChain Axelar Module

---
 remappings.txt                         |  1 +
 src/module/token/crosschain/Axelar.sol | 98 ++++++++++++++++++++++++++
 2 files changed, 99 insertions(+)
 create mode 100644 src/module/token/crosschain/Axelar.sol

diff --git a/remappings.txt b/remappings.txt
index 413cecc2..c3f9c4b3 100644
--- a/remappings.txt
+++ b/remappings.txt
@@ -5,3 +5,4 @@ forge-std/=lib/forge-std/src/
 @erc721a-upgradeable/=lib/ERC721A-Upgradeable/contracts/
 @limitbreak/creator-token-standards/=lib/creator-token-standards/src/
 @limitbreak/permit-c/=lib/PermitC/src/
+@axelar-network/sdk-solidity/=lib/axelar-gmp-sdk-solidity/contracts/
diff --git a/src/module/token/crosschain/Axelar.sol b/src/module/token/crosschain/Axelar.sol
new file mode 100644
index 00000000..5d21195a
--- /dev/null
+++ b/src/module/token/crosschain/Axelar.sol
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.20;
+
+import {Module} from "../../../Module.sol";
+
+import {Role} from "../../../Role.sol";
+import {IInstallationCallback} from "../../../interface/IInstallationCallback.sol";
+
+import {CrossChain} from "./CrossChain.sol";
+import {AxelarExecutable} from "@axelar-network/sdk-solidity/executable/AxelarExecutable.sol";
+import {IAxelarGateway} from "@axelar-network/sdk-solidity/interfaces/IAxelarGateway.sol";
+import {OwnableRoles} from "@solady/auth/OwnableRoles.sol";
+
+contract AxelarCrossChain is Module, AxelarExecutable, CrossChain {
+
+    constructor(address _axelarGateway) AxelarExecutable(_axelarGateway) {}
+
+    /// @notice Returns all implemented callback and fallback functions.
+    function getModuleConfig() external pure override returns (ModuleConfig memory config) {
+        config.fallbackFunctions = new FallbackFunction[](3);
+
+        config.fallbackFunctions[0] = FallbackFunction({selector: this.getRouter.selector, permissionBits: 0});
+        config.fallbackFunctions[1] =
+            FallbackFunction({selector: this.setRouter.selector, permissionBits: Role._MANAGER_ROLE});
+        config.fallbackFunctions[2] =
+            FallbackFunction({selector: this.sendCrossChainTransaction.selector, permissionBits: 0});
+    }
+
+    /*//////////////////////////////////////////////////////////////
+                            FALLBACK FUNCTIONS
+    //////////////////////////////////////////////////////////////*/
+
+    function getRouter() external view override returns (address) {
+        return address(gateway);
+    }
+
+    function setRouter(address _router) external override {}
+
+    function sendCrossChainTransaction(
+        uint64 _destinationChain,
+        address _callAddress,
+        bytes calldata _payload,
+        bytes calldata _extraArgs
+    ) external payable override {
+        (string memory destinationChain, string memory contractAddress, bytes memory tokenData) =
+            abi.decode(_extraArgs, (string, string, bytes));
+
+        if (tokenData.length > 0) {
+            (string memory symbol, uint256 amount) = abi.decode(tokenData, (string, uint256));
+            gateway.callContractWithToken(destinationChain, contractAddress, _payload, symbol, amount);
+        } else {
+            gateway.callContract(destinationChain, contractAddress, _payload);
+        }
+
+        onCrossChainTransactionSent(_destinationChain, _callAddress, _payload, _extraArgs);
+    }
+
+    function _execute(string calldata sourceChain, string calldata sourceAddress, bytes calldata payload)
+        internal
+        override
+    {
+        onCrossChainTransactionReceived(0, address(0), payload, "");
+    }
+
+    function _executeWithToken(
+        string calldata sourceChain,
+        string calldata sourceAddress,
+        bytes calldata payload,
+        string calldata tokenSymbol,
+        uint256 amount
+    ) internal override {
+        bytes memory extraArgs = abi.encode(tokenSymbol, amount);
+        onCrossChainTransactionReceived(0, address(0), payload, extraArgs);
+    }
+
+    /*//////////////////////////////////////////////////////////////
+                            INTERNAL FUNCTIONS
+    //////////////////////////////////////////////////////////////*/
+
+    function onCrossChainTransactionSent(
+        uint64 _destinationChain,
+        address _callAddress,
+        bytes calldata _payload,
+        bytes calldata _extraArgs
+    ) internal override {
+        /// post cross chain transaction sent logic goes here
+    }
+
+    function onCrossChainTransactionReceived(
+        uint64 _sourceChain,
+        address _sourceAddress,
+        bytes memory _payload,
+        bytes memory _extraArgs
+    ) internal override {
+        /// post cross chain transaction received logic goes here
+    }
+
+}