Keep only universal app examples

swap/.eslintignore

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+.yarn
+artifacts
+cache
+coverage
+node_modules
+typechain-types

swap/.eslintrc.js

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+const path = require("path");
+
+/**
+ * @type {import("eslint").Linter.Config}
+ */
+module.exports = {
+  env: {
+    browser: false,
+    es2021: true,
+    mocha: true,
+    node: true,
+  },
+  extends: ["plugin:prettier/recommended"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+  plugins: [
+    "@typescript-eslint",
+    "prettier",
+    "simple-import-sort",
+    "sort-keys-fix",
+    "typescript-sort-keys",
+  ],
+  rules: {
+    "@typescript-eslint/sort-type-union-intersection-members": "error",
+    camelcase: "off",
+    "simple-import-sort/exports": "error",
+    "simple-import-sort/imports": "error",
+    "sort-keys-fix/sort-keys-fix": "error",
+    "typescript-sort-keys/interface": "error",
+    "typescript-sort-keys/string-enum": "error",
+  },
+  settings: {
+    "import/parsers": {
+      "@typescript-eslint/parser": [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+    },
+    "import/resolver": {
+      node: {
+        extensions: [".js", ".jsx", ".ts", ".tsx", ".d.ts"],
+      },
+      typescript: {
+        project: path.join(__dirname, "tsconfig.json"),
+      },
+    },
+  },
+};

swap/.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+dependencies
+
+# Hardhat files
+cache
+artifacts
+
+# Foundry files
+out
+cache_forge
+
+access_token

swap/LICENSE

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+MIT License
+
+Copyright (c) 2023 ZetaChain
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

swap/README.md

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+# ZetaChain Contracts Template
+
+## Getting Started
+
+Install dependencies:
+
+```
+yarn
+```
+
+## Next Steps
+
+Ready to dive in? Follow our [**🚀 smart contract
+tutorials**](https://www.zetachain.com/docs/developers/tutorials/intro/) to
+start building universal app contracts.

swap/contracts/Swap.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.26;
+
+import {SystemContract, IZRC20} from "@zetachain/toolkit/contracts/SystemContract.sol";
+import {SwapHelperLib} from "@zetachain/toolkit/contracts/SwapHelperLib.sol";
+import {BytesHelperLib} from "@zetachain/toolkit/contracts/BytesHelperLib.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+import {RevertContext, RevertOptions} from "@zetachain/protocol-contracts/contracts/Revert.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/UniversalContract.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/IGatewayZEVM.sol";
+
+contract Swap is UniversalContract {
+    SystemContract public systemContract;
+    uint256 constant BITCOIN = 18332;
+    address constant gatewayAddress =
+        0xA51c1fc2f0D1a1b8494Ed1FE312d7C3a78Ed91C0;
+
+    constructor(address systemContractAddress) {
+        systemContract = SystemContract(systemContractAddress);
+    }
+
+    struct Params {
+        address target;
+        bytes to;
+    }
+
+    function onCrossChainCall(
+        zContext calldata context,
+        address zrc20,
+        uint256 amount,
+        bytes calldata message
+    ) external override {
+        Params memory params = Params({target: address(0), to: bytes("")});
+        if (context.chainID == BITCOIN) {
+            params.target = BytesHelperLib.bytesToAddress(message, 0);
+            params.to = abi.encodePacked(
+                BytesHelperLib.bytesToAddress(message, 20)
+            );
+        } else {
+            (address targetToken, bytes memory recipient) = abi.decode(
+                message,
+                (address, bytes)
+            );
+            params.target = targetToken;
+            params.to = recipient;
+        }
+
+        uint256 inputForGas;
+        address gasZRC20;
+        uint256 gasFee;
+        uint256 swapAmount;
+
+        (gasZRC20, gasFee) = IZRC20(params.target).withdrawGasFee();
+
+        if (gasZRC20 == zrc20) {
+            swapAmount = amount - gasFee;
+        } else {
+            inputForGas = SwapHelperLib.swapTokensForExactTokens(
+                systemContract,
+                zrc20,
+                gasFee,
+                gasZRC20,
+                amount
+            );
+            swapAmount = amount - inputForGas;
+        }
+
+        uint256 outputAmount = SwapHelperLib.swapExactTokensForTokens(
+            systemContract,
+            zrc20,
+            swapAmount,
+            params.target,
+            0
+        );
+
+        if (gasZRC20 == params.target) {
+            IZRC20(gasZRC20).approve(gatewayAddress, outputAmount + gasFee);
+        } else {
+            IZRC20(gasZRC20).approve(gatewayAddress, gasFee);
+            IZRC20(params.target).approve(gatewayAddress, outputAmount);
+        }
+        IGatewayZEVM(gatewayAddress).withdraw(
+            params.to,
+            outputAmount,
+            params.target,
+            RevertOptions({
+                revertAddress: address(0),
+                callOnRevert: false,
+                abortAddress: address(0),
+                revertMessage: "",
+                onRevertGasLimit: 0
+            })
+        );
+    }
+
+    function onRevert(RevertContext calldata revertContext) external override {}
+}

swap/contracts/SwapToAnyToken.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.26;
+
+import {SystemContract, IZRC20} from "@zetachain/toolkit/contracts/SystemContract.sol";
+import {SwapHelperLib} from "@zetachain/toolkit/contracts/SwapHelperLib.sol";
+import {BytesHelperLib} from "@zetachain/toolkit/contracts/BytesHelperLib.sol";
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+import {RevertContext, RevertOptions} from "@zetachain/protocol-contracts/contracts/Revert.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/UniversalContract.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/IGatewayZEVM.sol";
+import "@zetachain/protocol-contracts/contracts/zevm/interfaces/IWZETA.sol";
+
+contract SwapToAnyToken is UniversalContract {
+    SystemContract public systemContract;
+    uint256 constant BITCOIN = 18332;
+    address constant gatewayAddress =
+        0xA51c1fc2f0D1a1b8494Ed1FE312d7C3a78Ed91C0;
+
+    constructor(address systemContractAddress) {
+        systemContract = SystemContract(systemContractAddress);
+    }
+
+    struct Params {
+        address target;
+        bytes to;
+        bool withdraw;
+    }
+
+    function onCrossChainCall(
+        zContext calldata context,
+        address zrc20,
+        uint256 amount,
+        bytes calldata message
+    ) external virtual override {
+        Params memory params = Params({
+            target: address(0),
+            to: bytes(""),
+            withdraw: true
+        });
+
+        if (context.chainID == BITCOIN) {
+            params.target = BytesHelperLib.bytesToAddress(message, 0);
+            params.to = abi.encodePacked(
+                BytesHelperLib.bytesToAddress(message, 20)
+            );
+            if (message.length >= 41) {
+                params.withdraw = BytesHelperLib.bytesToBool(message, 40);
+            }
+        } else {
+            (
+                address targetToken,
+                bytes memory recipient,
+                bool withdrawFlag
+            ) = abi.decode(message, (address, bytes, bool));
+            params.target = targetToken;
+            params.to = recipient;
+            params.withdraw = withdrawFlag;
+        }
+
+        uint256 inputForGas;
+        address gasZRC20;
+        uint256 gasFee;
+        uint256 swapAmount;
+
+        if (params.withdraw) {
+            (gasZRC20, gasFee) = IZRC20(params.target).withdrawGasFee();
+
+            if (gasZRC20 == zrc20) {
+                swapAmount = amount - gasFee;
+            } else {
+                inputForGas = SwapHelperLib.swapTokensForExactTokens(
+                    systemContract,
+                    zrc20,
+                    gasFee,
+                    gasZRC20,
+                    amount
+                );
+                swapAmount = amount - inputForGas;
+            }
+        }
+
+        uint256 outputAmount = SwapHelperLib.swapExactTokensForTokens(
+            systemContract,
+            zrc20,
+            swapAmount,
+            params.target,
+            0
+        );
+
+        if (params.withdraw) {
+            if (gasZRC20 == params.target) {
+                IZRC20(gasZRC20).approve(gatewayAddress, outputAmount + gasFee);
+            } else {
+                IZRC20(gasZRC20).approve(gatewayAddress, gasFee);
+                IZRC20(params.target).approve(gatewayAddress, outputAmount);
+            }
+            IGatewayZEVM(gatewayAddress).withdraw(
+                params.to,
+                outputAmount,
+                params.target,
+                RevertOptions({
+                    revertAddress: address(0),
+                    callOnRevert: false,
+                    abortAddress: address(0),
+                    revertMessage: "",
+                    onRevertGasLimit: 0
+                })
+            );
+        } else {
+            IWETH9(params.target).transfer(
+                address(uint160(bytes20(params.to))),
+                outputAmount
+            );
+        }
+    }
+
+    function onRevert(RevertContext calldata revertContext) external override {}
+}

swap/foundry.toml

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+[profile.default]
+src = 'contracts'
+out = 'out'
+viaIR = true
+libs = ['node_modules', 'lib']
+test = 'test'
+cache_path  = 'cache_forge'
+verbosity = 3
+
+[dependencies]
+forge-std = { version = "1.9.2" }

swap/hardhat.config.ts

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+import "./tasks/deploy";
+import "@zetachain/localnet/tasks";
+import "@nomicfoundation/hardhat-toolbox";
+import "@zetachain/toolkit/tasks";
+
+import { getHardhatConfigNetworks } from "@zetachain/networks";
+import { HardhatUserConfig } from "hardhat/config";
+
+const config: HardhatUserConfig = {
+  networks: {
+    ...getHardhatConfigNetworks(),
+  },
+  solidity: {
+    compilers: [
+      { version: "0.5.10" /** For create2 factory */ },
+      { version: "0.6.6" /** For uniswap v2 router*/ },
+      { version: "0.5.16" /** For uniswap v2 core*/ },
+      { version: "0.4.19" /** For weth*/ },
+      { version: "0.8.7" },
+      { version: "0.8.26" },
+    ],
+  },
+};
+
+export default config;