Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import { IERC20 } from "../../lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol";

interface IXCareConstants {
    function sendFeeBps() external view returns (uint256);
    function feeSendRecipient() external view returns (address);
}

contract BridgeWithFeeLifi {
    IXCareConstants public immutable constants;
    address public immutable LIFI_DIAMOND; // usually 0x1231... on most networks

    event LifiExecuted(
        address indexed user,
        address indexed token,
        uint256 amountIn,
        uint256 feeAmount,
        uint256 netAmount,
        address approvalAddress,
        address target,
        uint256 value
    );

    error CallFailed(bytes returndata);

    constructor(address _constants, address _lifiDiamond) {
        require(_constants != address(0), "bad constants");
        require(_lifiDiamond != address(0), "bad lifi");
        constants = IXCareConstants(_constants);
        LIFI_DIAMOND = _lifiDiamond;
    }

    /**
     * @notice Backend computes LI.FI quote and passes:
     *  - approvalAddress: quote.estimate.approvalAddress
     *  - data:           quote.transactionRequest.data
     *  - value:          quote.transactionRequest.value (usually 0 for ERC20 routes)
     *  - (optional) target: quote.transactionRequest.to (commonly LiFiDiamond)
     *
     * IMPORTANT: you MUST validate off-chain that:
     *  - fromAddress is this contract
     *  - token/amount match what user provided
     *  - recipient/toAddress match your intended Solana address
     */
    function bridgeWithFeeViaLifi(
        address token,
        uint256 amountIn,
        address approvalAddress,
        address target,
        uint256 value,
        bytes calldata data
    ) external payable {
        require(amountIn > 0, "amount=0");
        require(token != address(0), "token=0");
        require(approvalAddress != address(0), "approval=0");
        require(target != address(0), "target=0");

        // Pull tokens
        require(IERC20(token).transferFrom(msg.sender, address(this), amountIn), "pull failed");

        // Fee
        uint256 feeBps = constants.sendFeeBps();
        address feeRecipient = constants.feeSendRecipient();
        uint256 fee = (amountIn * feeBps) / 10_000;
        uint256 netAmount = amountIn - fee;
        require(netAmount > 0, "net=0");

        require(IERC20(token).transfer(feeRecipient, fee), "fee transfer failed");

        // Approve LI.FI's required spender for exactly netAmount
        // (many tokens require reset-to-0 first)
        require(IERC20(token).approve(approvalAddress, 0), "reset approve failed");
        require(IERC20(token).approve(approvalAddress, netAmount), "approve failed");

        // If LI.FI call needs native value (rare for ERC20 routes), forward it via msg.value
        require(msg.value >= value, "insufficient msg.value");

        (bool ok, bytes memory ret) = target.call{value: value}(data);
        if (!ok) revert CallFailed(ret);

        // refund any extra msg.value
        uint256 refund = msg.value - value;
        if (refund > 0) {
            (bool r, ) = msg.sender.call{value: refund}("");
            require(r, "refund failed");
        }

        emit LifiExecuted(msg.sender, token, amountIn, fee, netAmount, approvalAddress, target, value);
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

{
  "remappings": [
    "@ensdomains/=lib/v4-core/node_modules/@ensdomains/",
    "@openzeppelin/=lib/v4-core/lib/openzeppelin-contracts/",
    "@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/permit2/lib/forge-gas-snapshot/src/",
    "forge-std/=lib/v4-core/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/v4-core/lib/solmate/",
    "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": "shanghai",
  "viaIR": true
}

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000000000000000000000000890ed658905efbaeed77069760ec9c7a62abef020000000000000000000000001231deb6f5749ef6ce6943a275a1d3e7486f4eae

-----Decoded View---------------
Arg [0] : _constants (address): 0x890ed658905EFbaeeD77069760Ec9c7a62aBEF02
Arg [1] : _lifiDiamond (address): 0x1231DEB6f5749EF6cE6943a275A1D3E7486F4EaE

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000890ed658905efbaeed77069760ec9c7a62abef02
Arg [1] : 0000000000000000000000001231deb6f5749ef6ce6943a275a1d3e7486f4eae