Contract Source Code (Solidity Standard Json-Input format)

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//SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

/// @notice Minimal interfaces for Uniswap v3 SwapRouter and WETH9 to avoid external deps
interface ISwapRouterV3 {
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        uint24 fee;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);
}

interface IWETH9Minimal {
    function deposit() external payable;
    function approve(address spender, uint256 value) external returns (bool);
}

/// @title ETH->DAI Uniswap v3 Swapper
/// @notice Single-function contract: accepts native ETH, swaps for DAI via Uniswap v3, sends DAI to caller
contract DhaiSwapper {
    ISwapRouterV3 public immutable swapRouter;
    address public immutable WETH9;
    address public immutable DAI;
    uint24 public immutable poolFee;

    event Swap(address indexed sender, uint256 amountIn, uint256 amountout);

    constructor(address _swapRouter, address _weth9, address _dai, uint24 _poolFee) {
        require(_swapRouter != address(0) && _weth9 != address(0) && _dai != address(0), "ZERO_ADDR");
        swapRouter = ISwapRouterV3(_swapRouter);
        WETH9 = _weth9;
        DAI = _dai;
        poolFee = _poolFee; // e.g. 500, 3000, or 10000

        // set a one-time infinite approval so swaps don't waste gas re-approving
        require(IWETH9Minimal(WETH9).approve(address(swapRouter), type(uint256).max), "APPROVE_INIT_FAIL");
    }

    /// @notice Swap exact ETH sent for DAI and send DAI to msg.sender
    /// @param minDaiOut Minimum DAI expected (slippage protection)
    /// @return amountOut The amount of DAI received
    function swapExactEthForDai(uint256 minDaiOut) external payable returns (uint256 amountOut) {
        amountOut = _swapExactEthForDaiTo(msg.sender, msg.value, minDaiOut);
    }

    /// @dev Internal helper used by both the explicit function and the receive() handler
    function _swapExactEthForDaiTo(address recipient, uint256 amountIn, uint256 minOut)
        internal
        returns (uint256 amountOut)
    {
        require(amountIn > 0, "NO_ETH");
        IWETH9Minimal(WETH9).deposit{value: amountIn}();
        amountOut = swapRouter.exactInputSingle(
            ISwapRouterV3.ExactInputSingleParams({
                tokenIn: WETH9,
                tokenOut: DAI,
                fee: poolFee,
                recipient: recipient,
                deadline: block.timestamp,
                amountIn: amountIn,
                amountOutMinimum: minOut,
                sqrtPriceLimitX96: 0
            })
        );
        emit Swap(recipient, amountIn, amountOut);
    }

    /// @notice Auto-swap on plain ETH receives and send DAI back to the sender
    receive() external payable {
        if (msg.value == 0) return;
        _swapExactEthForDaiTo(msg.sender, msg.value, 0);
    }
}

{
  "remappings": [
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@ensdomains/=lib/v4-core/node_modules/@ensdomains/",
    "@uniswap/v4-core/=lib/v4-periphery/lib/v4-core/",
    "ds-test/=lib/v4-core/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-gas-snapshot/=lib/v4-periphery/lib/permit2/lib/forge-gas-snapshot/src/",
    "forge-std/=lib/forge-std/src/",
    "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
    "hardhat/=lib/v4-core/node_modules/hardhat/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "permit2/=lib/v4-periphery/lib/permit2/",
    "solidity-bytes-utils/=lib/solidity-bytes-utils/contracts/",
    "solmate/=lib/v4-core/lib/solmate/",
    "v4-core/=lib/v4-core/src/",
    "v4-periphery/=lib/v4-periphery/"
  ],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "prague",
  "viaIR": false
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_swapRouter","type":"address"},{"internalType":"address","name":"_weth9","type":"address"},{"internalType":"address","name":"_dai","type":"address"},{"internalType":"uint24","name":"_poolFee","type":"uint24"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountout","type":"uint256"}],"name":"Swap","type":"event"},{"inputs":[],"name":"DAI","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WETH9","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poolFee","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"minDaiOut","type":"uint256"}],"name":"swapExactEthForDai","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"swapRouter","outputs":[{"internalType":"contract ISwapRouterV3","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000e592427a0aece92de3edee1f18e0157c05861564000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc20000000000000000000000006b175474e89094c44da98b954eedeac495271d0f0000000000000000000000000000000000000000000000000000000000000bb8

-----Decoded View---------------
Arg [0] : _swapRouter (address): 0xE592427A0AEce92De3Edee1F18E0157C05861564
Arg [1] : _weth9 (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [2] : _dai (address): 0x6B175474E89094C44Da98b954EedeAC495271d0F
Arg [3] : _poolFee (uint24): 3000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000e592427a0aece92de3edee1f18e0157c05861564
Arg [1] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [2] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000bb8