Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IUniswapV2Factory {
    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address);
}
interface IUniswapV2Pair {
    function getReserves()
        external
        view
        returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function swap(
        uint amount0Out,
        uint amount1Out,
        address to,
        bytes calldata data
    ) external;
}
interface IUniswapV3Pool {
    function swap(
        address recipient,
        bool zeroForOne,
        int256 amountSpecified,
        uint160 sqrtPriceLimitX96,
        bytes calldata data
    ) external returns (int256 amount0, int256 amount1);
    function token0() external view returns (address);
    function token1() external view returns (address);
}
interface IUniswapV3Factory {
    function getPool(
        address tokenA,
        address tokenB,
        uint24 fee
    ) external view returns (address);
}
interface IPermit2 {
    struct TokenPermissions {
        address token;
        uint256 amount;
    }
    struct PermitTransferFrom {
        TokenPermissions permitted;
        uint256 nonce;
        uint256 deadline;
    }
    struct SignatureTransferDetails {
        address to;
        uint256 requestedAmount;
    }
    function permitTransferFrom(
        PermitTransferFrom calldata permit,
        SignatureTransferDetails calldata transferDetails,
        address owner,
        bytes calldata signature
    ) external;
}

contract HumanRouter {
    // *** Constants: Official Uniswap and World addresses on World Chain ***
    address constant UNISWAP_V2_FACTORY =
        0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f; // Uniswap V2 factory
    address constant UNISWAP_V3_FACTORY =
        0x7a5028BDa40e7B173C278C5342087826455ea25a; // Uniswap V3 factory
    address constant PERMIT2 = 0x000000000022D473030F116dDEE9F6B43aC78BA3; // Uniswap Permit2
    uint256 constant FEE_BPS = 100; // 1% fee (in basis points)

    // Events
    event SwapExecuted(
        address indexed user,
        address indexed tokenIn,
        address indexed tokenOut,
        uint256 amountIn,
        uint256 amountOut,
        uint256 feeAmount,
        address[] path,
        uint24[] fees
    );

    // Uniswap V3 TickMath sqrtPriceX96 limits (for no price limit on swaps):
    uint160 constant MIN_SQRT_RATIO = 4295128739 + 1;
    uint160 constant MAX_SQRT_RATIO =
        1461446703485210103287273052203988822378723970342 - 1;

    address public owner;
    constructor() {
        owner = msg.sender;
    }
    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner");
        _;
    }

    // Withdraw function for owner to collect any tokens (e.g. accumulated fees) from the contract
    function withdrawToken(address token, uint256 amount) external onlyOwner {
        require(token != address(0), "Invalid token");
        // Transfer `amount` of `token` to the owner. (Using low-level call to support any ERC-20)
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(
                bytes4(keccak256("transfer(address,uint256)")),
                owner,
                amount
            )
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "Withdraw transfer failed"
        );
    }

    /**
     * @notice Swap an exact `amountIn` of `tokenIn` for `tokenOut` along a specified path, using Permit2 for input transfer.
     * @param tokenIn      The input ERC-20 token address.
     * @param tokenOut     The output ERC-20 token address.
     * @param amountIn     The total amount of tokenIn to pull from the user (includes the 1% fee).
     * @param amountOutMin The minimum acceptable amount of tokenOut (reverts if output is lower).
     * @param path         An array of token addresses representing the swap path from tokenIn to tokenOut.
     * @param fees         An array of fees for each hop (0 for Uniswap v2, or the v3 fee tier in basis points for that hop).
     * @param deadline     Timestamp after which the swap will be rejected (to avoid stale routes).
     * @param permitNonce  The nonce used in the Permit2 signature (to prevent replay).
     * @param permitDeadline Expiration time for the Permit2 signature.
     * @param permitSignature The Permit2 signature from the user authorizing this contract to spend tokenIn.
     */
    function swapExactInputMultiHop(
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        uint24[] calldata fees,
        uint256 deadline,
        uint256 permitNonce,
        uint256 permitDeadline,
        bytes calldata permitSignature
    ) external {
        require(block.timestamp <= deadline, "Route expired");
        // Path must start with tokenIn and end with tokenOut, with fees length = path.length-1
        require(
            path.length >= 2 &&
                path[0] == tokenIn &&
                path[path.length - 1] == tokenOut,
            "Invalid path"
        );
        require(fees.length == path.length - 1, "Invalid fees");

        // **1. Transfer tokenIn from user to this contract using Permit2 (signature-based transfer)**
        IPermit2(PERMIT2).permitTransferFrom(
            IPermit2.PermitTransferFrom({
                permitted: IPermit2.TokenPermissions({
                    token: tokenIn,
                    amount: amountIn
                }),
                nonce: permitNonce,
                deadline: permitDeadline
            }),
            IPermit2.SignatureTransferDetails({
                to: address(this),
                requestedAmount: amountIn
            }),
            msg.sender,
            permitSignature
        );
        // At this point, `amountIn` of tokenIn has been pulled from msg.sender into this contract.

        // **2. Deduct fee and determine swap amount.** (1% fee is taken on the input amount)
        uint256 feeAmount = (amountIn * FEE_BPS) / 10000; // 1% of input
        uint256 swapAmount = amountIn - feeAmount; // amount to actually swap
        // (The `feeAmount` remains in the contract as fee; owner can withdraw it later.)

        // **3. Perform the swaps along the specified route.**
        uint256 outputAmount = swapAmount;
        address currentToken = tokenIn;
        // Loop through each hop in the path
        for (uint256 i = 0; i < fees.length; ++i) {
            address nextToken = path[i + 1];
            uint24 fee = fees[i];
            if (fee == 0) {
                // *Uniswap v2 hop* (fee=0 indicates a v2 pair)
                address pair = IUniswapV2Factory(UNISWAP_V2_FACTORY).getPair(
                    currentToken,
                    nextToken
                );
                require(pair != address(0), "No Uniswap v2 pair for hop");
                // Get reserves to compute output for exact input swap formula
                (uint112 reserve0, uint112 reserve1, ) = IUniswapV2Pair(pair)
                    .getReserves();
                uint256 res0 = uint256(reserve0);
                uint256 res1 = uint256(reserve1);
                require(res0 > 0 && res1 > 0, "Pair has no liquidity");
                // Determine input/output reserve order
                bool invert = currentToken < nextToken;
                uint256 reserveIn = invert ? res0 : res1;
                uint256 reserveOut = invert ? res1 : res0;
                // Uniswap v2 formula: amountOut = (amountIn * 997 / 1000) * reserveOut / (reserveIn + (amountIn * 997 / 1000))
                uint256 amountInWithFee = outputAmount * 997;
                uint256 numerator = amountInWithFee * reserveOut;
                uint256 denominator = reserveIn * 1000 + amountInWithFee;
                uint256 out = denominator == 0 ? 0 : (numerator / denominator);
                require(out > 0, "Uniswap v2 swap output is 0");
                // Transfer input tokens to the pair, then call swap to send out tokens
                _safeTransfer(currentToken, pair, outputAmount);
                (uint256 amt0Out, uint256 amt1Out) = invert
                    ? (uint256(0), out)
                    : (out, uint256(0));
                IUniswapV2Pair(pair).swap(
                    amt0Out,
                    amt1Out,
                    (i == fees.length - 1 ? msg.sender : address(this)), // send output to user if final hop, else to this contract for next hop
                    bytes("") // no callback data for v2 swap
                );
                outputAmount = out;
            } else {
                // *Uniswap v3 hop* (fee > 0 indicates a v3 pool fee tier)
                address pool = IUniswapV3Factory(UNISWAP_V3_FACTORY).getPool(
                    currentToken,
                    nextToken,
                    fee
                );
                require(pool != address(0), "No Uniswap v3 pool for hop");
                bool zeroForOne = currentToken < nextToken; // swap token0->token1 if true, else token1->token0
                // Call v3 pool.swap. The pool will callback our contract (uniswapV3SwapCallback) for the input token.
                _v3CallbackPool = pool;
                _inV3Swap = true;
                (int256 amt0, int256 amt1) = IUniswapV3Pool(pool).swap(
                    (i == fees.length - 1 ? msg.sender : address(this)), // recipient: user for final hop, otherwise this contract for intermediate
                    zeroForOne,
                    int256(outputAmount),
                    zeroForOne ? MIN_SQRT_RATIO : MAX_SQRT_RATIO, // price limit set to allow full swap&#8203;:contentReference[oaicite:15]{index=15}
                    bytes("") // no custom data needed; we use storage vars to validate callback
                );
                _inV3Swap = false;
                _v3CallbackPool = address(0);
                // Calculate the output amount from swap return values:
                uint256 out = zeroForOne ? uint256(-amt1) : uint256(-amt0);
                outputAmount = out;
            }
            currentToken = nextToken;
        }

        // **4. Slippage check:** ensure final output is at least amountOutMin.
        require(outputAmount >= amountOutMin, "Insufficient output amount");
        // Note: The final output tokens have already been sent to msg.sender during the last hop (see recipient in swaps above).
        // Thus, the user receives the output tokens here. The 1% fee remains in this contract.

        // Emit the SwapExecuted event
        emit SwapExecuted(
            msg.sender,
            tokenIn,
            tokenOut,
            amountIn,
            outputAmount,
            feeAmount,
            path,
            fees
        );
    }

    // --- Storage variables for controlling v3 callback ---
    bool private _inV3Swap;
    address private _v3CallbackPool;

    /**
     * @dev Uniswap V3 callback function called during pool.swap().
     * It transfers the required tokens to the pool. Only the legitimate pool call is honored.
     */
    function uniswapV3SwapCallback(
        int256 amount0Delta,
        int256 amount1Delta,
        bytes calldata
    ) external {
        // Security: Ensure the caller is the expected v3 pool we called and that we are in a swap context&#8203;:contentReference[oaicite:16]{index=16}.
        require(
            _inV3Swap && msg.sender == _v3CallbackPool,
            "Unauthorized callback"
        );
        if (amount0Delta > 0) {
            // Pool needs `amount0Delta` of token0
            address token0 = IUniswapV3Pool(msg.sender).token0();
            _safeTransfer(token0, msg.sender, uint256(amount0Delta));
        }
        if (amount1Delta > 0) {
            // Pool needs `amount1Delta` of token1
            address token1 = IUniswapV3Pool(msg.sender).token1();
            _safeTransfer(token1, msg.sender, uint256(amount1Delta));
        }
        // Any positive delta has been paid; if both are 0, nothing happens (no tokens needed).
    }

    // Internal safe ERC20 transfer (reverts on failure)
    function _safeTransfer(address token, address to, uint256 value) private {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(0xa9059cbb, to, value) // bytes4(keccak256("transfer(address,uint256)"))
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "Token transfer failed"
        );
    }
}

{
  "remappings": [
    "@uniswap/v4-core/=lib/v4-core/",
    "@uniswap/v4-periphery/=lib/v4-periphery/",
    "@uniswap/permit2/=lib/permit2/",
    "@uniswap/universal-router/=lib/universal-router/",
    "@uniswap/v3-core/=lib/v3-core/",
    "@uniswap/v2-core/=lib/v2-core/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "@ensdomains/=lib/v4-core/node_modules/@ensdomains/",
    "ds-test/=lib/universal-router/solmate/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-gas-snapshot/=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/permit2/",
    "solmate/=lib/universal-router/lib/solmate/",
    "universal-router/=lib/universal-router/",
    "v2-core/=lib/v2-core/contracts/",
    "v3-core/=lib/v3-core/",
    "v4-core/=lib/v4-core/src/",
    "v4-periphery/=lib/v4-periphery/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": true,
  "libraries": {}
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"address","name":"tokenIn","type":"address"},{"indexed":true,"internalType":"address","name":"tokenOut","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountIn","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountOut","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"feeAmount","type":"uint256"},{"indexed":false,"internalType":"address[]","name":"path","type":"address[]"},{"indexed":false,"internalType":"uint24[]","name":"fees","type":"uint24[]"}],"name":"SwapExecuted","type":"event"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"uint24[]","name":"fees","type":"uint24[]"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint256","name":"permitNonce","type":"uint256"},{"internalType":"uint256","name":"permitDeadline","type":"uint256"},{"internalType":"bytes","name":"permitSignature","type":"bytes"}],"name":"swapExactInputMultiHop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"uniswapV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawToken","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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