CacSwapPool

{{
  "language": "Solidity",
  "sources": {
    "contracts/CacSwapPool.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity 0.8.20;\r
\r
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";\r
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";\r
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";\r
import {ECDSA} from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";\r
\r
/**\r
 * @title CacSwapPool - Decentralized CAC/USDC Swap Pool (Security Hardened)\r
 * @notice Enables peer-to-peer token swaps with approval-based liquidity provision\r
 * @dev Security Features:\r
 *      - Approval-based model: tokens stay in LP wallets (no custody)\r
 *      - Backend-coordinated: random LP selection with balance verification\r
 *      - Composite nonce system (per-user + per-LP, prevents cross-LP replay)\r
 *      - Strict balance checks before ALL transfers\r
 *      - Enforced slippage protection (minAmountOut validation)\r
 *      - 2-step updates with timelock for critical addresses\r
 *      - Emergency pause functionality\r
 *      - Minimum swap amounts (gas cost protection)\r
 *      - Direct fee payment to LPs (0.3%, configurable)\r
 *      - Checks-Effects-Interactions pattern\r
 * \r
 * @dev Fee Structure:\r
 *      - Configurable LP swap fee (default 0.3% = 30 basis points)\r
 *      - LP fee stays directly with LP (not escrowed in contract)\r
 *      - CAC's built-in 1% transfer fee (automatic, paid by swapper)\r
 * \r
 * @dev Integration:\r
 *      - Frontend: Users connect wallet and execute swaps\r
 *      - Backend: Monitors approvals, verifies balances, signs swap orders, tracks LP earnings\r
 *      - LPs: Simply approve tokens to contract (no deposits needed)\r
 */\r
contract CacSwapPool is Ownable, ReentrancyGuard {\r
    using SafeERC20 for IERC20;\r
    using ECDSA for bytes32;\r
\r
    // ============ Immutable State (Maximum Security) ============\r
    IERC20 public immutable usdcToken;\r
    IERC20 public immutable cacToken;\r
    \r
    // ============ Mutable State ============\r
    address public trustedSigner;\r
    address public pendingTrustedSigner;\r
    uint256 public signerProposalTime;\r
    \r
    // Optimized nonce: single counter per user, with salt for uniqueness\r
    mapping(address => uint256) public nonces;\r
    \r
    uint256 public swapFeeRate; // Basis points (30 = 0.3%, max 1000 = 10%)\r
    bool public paused;\r
    \r
    uint256 private constant BASIS_POINTS = 10000;\r
    uint256 private constant USDC_DECIMALS = 6;\r
    uint256 private constant CAC_DECIMALS = 8;\r
    uint256 private constant TIMELOCK_DURATION = 48 hours; // Security delay for signer changes\r
    uint256 private constant DEADLINE_BUFFER = 5 minutes; // Mempool delay tolerance\r
    uint256 private constant CAC_TRANSFER_FEE_RATE = 100; // CAC's built-in 1% fee (100 basis points)\r
\r
    // ============ EIP-712 Domain Separator ============\r
    bytes32 private constant DOMAIN_SEPARATOR_TYPEHASH =\r
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");\r
    bytes32 private immutable _domainSeparator;\r
\r
    // ============ EIP-712 Type Hash ============\r
    bytes32 private constant SWAP_ORDER_TYPEHASH = keccak256(\r
        "SwapOrder(address swapper,address lpProvider,uint256 amountIn,uint256 minAmountOut,uint256 lpFee,uint256 deadline,uint256 nonce,bytes32 salt)"\r
    );\r
\r
    // ============ Events ============\r
    /**\r
     * @notice Emitted when a swap is successfully executed\r
     * @dev lpFeeEarned is tracked separately for LP earnings aggregation\r
     */\r
    event SwapExecuted(\r
        address indexed swapper,\r
        address indexed lpProvider,\r
        address indexed tokenIn,\r
        address tokenOut,\r
        uint256 amountIn,\r
        uint256 amountOut,\r
        uint256 lpFeeEarned,\r
        uint256 nonce\r
    );\r
    \r
    event SwapFailed(\r
        address indexed swapper,\r
        address indexed lpProvider,\r
        string reason\r
    );\r
    \r
    event TrustedSignerProposed(address indexed proposer, address indexed newSigner, uint256 proposalTime);\r
    event TrustedSignerAccepted(address indexed oldSigner, address indexed newSigner);\r
    event SwapFeeRateUpdated(uint256 oldRate, uint256 newRate);\r
    event EmergencyPause(address indexed account);\r
    event EmergencyUnpause(address indexed account);\r
    event TokensRescued(address indexed token, uint256 amount, address indexed to);\r
\r
    // ============ Errors ============\r
    error ZeroAddress();\r
    error SameValue();\r
    error ZeroAmount();\r
    error InsufficientAmount();\r
    error ExpiredDeadline();\r
    error InvalidSignature();\r
    error InvalidNonce();\r
    error ContractPaused();\r
    error NotPaused();\r
    error InvalidFeeRate();\r
    error NotPendingSigner();\r
    error NoPendingSigner();\r
    error TimelockNotExpired();\r
    error InsufficientLPBalance();\r
    error InsufficientLPAllowance();\r
    error SlippageExceeded();\r
\r
    // ============ Modifiers ============\r
    modifier whenNotPaused() {\r
        if (paused) revert ContractPaused();\r
        _;\r
    }\r
\r
    // ============ Internal Structs (to avoid stack depth issues) ============\r
    struct SwapParams {\r
        address lpProvider;\r
        uint256 amountIn;\r
        uint256 minAmountOut;\r
        uint256 lpFee;\r
        uint256 deadline;\r
        bytes32 salt;\r
        bytes signature;\r
    }\r
\r
    struct SwapState {\r
        uint256 currentNonce;\r
        uint256 totalAmountOut;\r
        uint256 balanceBefore;\r
        uint256 actualReceived;\r
    }\r
\r
    /**\r
     * @notice Initialize the CacSwapPool contract\r
     * @param _usdcToken USDC token address (immutable for security)\r
     * @param _cacToken CAC token address (immutable for security)\r
     * @param _trustedSigner Backend signer address (cold wallet recommended)\r
     * @param _swapFeeRate Initial swap fee in basis points (30 = 0.3%)\r
     */\r
    constructor(\r
        address _usdcToken,\r
        address _cacToken,\r
        address _trustedSigner,\r
        uint256 _swapFeeRate\r
    ) Ownable(msg.sender) {\r
        if (_usdcToken == address(0)) revert ZeroAddress();\r
        if (_cacToken == address(0)) revert ZeroAddress();\r
        if (_trustedSigner == address(0)) revert ZeroAddress();\r
        if (_swapFeeRate > 1000) revert InvalidFeeRate(); // Max 10% fee\r
\r
        usdcToken = IERC20(_usdcToken);\r
        cacToken = IERC20(_cacToken);\r
        trustedSigner = _trustedSigner;\r
        swapFeeRate = _swapFeeRate;\r
        \r
        _domainSeparator = _computeDomainSeparator();\r
    }\r
\r
    // ============ EIP-712 Functions ============\r
\r
    function _computeDomainSeparator() private view returns (bytes32) {\r
        return keccak256(\r
            abi.encode(\r
                DOMAIN_SEPARATOR_TYPEHASH,\r
                keccak256(bytes("CAC-Swap-Pool")),\r
                keccak256(bytes("1")),\r
                block.chainid,\r
                address(this)\r
            )\r
        );\r
    }\r
\r
    function _hashTypedDataV4(bytes32 structHash) internal view returns (bytes32) {\r
        return keccak256(\r
            abi.encodePacked(\r
                "\x19\x01",\r
                _domainSeparator,\r
                structHash\r
            )\r
        );\r
    }\r
\r
    // ============ Internal Helper Functions ============\r
\r
    /**\r
     * @notice Verify LP has sufficient balance and allowance\r
     * @dev Helper to reduce stack depth in main swap functions\r
     */\r
    function _verifyLPFunds(\r
        address lpProvider,\r
        IERC20 token,\r
        uint256 requiredAmount\r
    ) internal view {\r
        if (token.balanceOf(lpProvider) < requiredAmount) revert InsufficientLPBalance();\r
        if (token.allowance(lpProvider, address(this)) < requiredAmount) revert InsufficientLPAllowance();\r
    }\r
\r
    /**\r
     * @notice Verify swapper has sufficient balance and allowance\r
     * @dev Helper to reduce stack depth in main swap functions\r
     */\r
    function _verifySwapperFunds(\r
        address swapper,\r
        IERC20 token,\r
        uint256 requiredAmount\r
    ) internal view {\r
        if (token.balanceOf(swapper) < requiredAmount) revert InsufficientAmount();\r
        if (token.allowance(swapper, address(this)) < requiredAmount) revert InsufficientAmount();\r
    }\r
\r
    /**\r
     * @notice Verify EIP-712 signature\r
     * @dev Helper to reduce stack depth in main swap functions\r
     */\r
    function _verifySignature(\r
        address swapper,\r
        address lpProvider,\r
        uint256 amountIn,\r
        uint256 minAmountOut,\r
        uint256 lpFee,\r
        uint256 deadline,\r
        uint256 nonce,\r
        bytes32 salt,\r
        bytes calldata signature\r
    ) internal view {\r
        bytes32 structHash = keccak256(\r
            abi.encode(\r
                SWAP_ORDER_TYPEHASH,\r
                swapper,\r
                lpProvider,\r
                amountIn,\r
                minAmountOut,\r
                lpFee,\r
                deadline,\r
                nonce,\r
                salt\r
            )\r
        );\r
\r
        bytes32 digest = _hashTypedDataV4(structHash);\r
        address signer = ECDSA.recover(digest, signature);\r
        if (signer != trustedSigner) revert InvalidSignature();\r
    }\r
\r
    /**\r
     * @notice Calculate fee amount given a base amount and fee rate\r
     * @param amount Base amount (in token's native decimals)\r
     * @param feeRate Fee rate in basis points (e.g., 30 = 0.3%)\r
     * @return Fee amount in same decimals as amount\r
     */\r
    function _calculateFee(uint256 amount, uint256 feeRate) internal pure returns (uint256) {\r
        return (amount * feeRate) / BASIS_POINTS;\r
    }\r
\r
    /**\r
     * @notice Validate basic swap input parameters\r
     * @dev Extracted to reduce stack depth\r
     */\r
    function _validateSwapInputs(\r
        address lpProvider,\r
        uint256 deadline\r
    ) internal view {\r
        if (lpProvider == address(0)) revert ZeroAddress();\r
        if (block.timestamp > deadline + DEADLINE_BUFFER) revert ExpiredDeadline();\r
    }\r
\r
    /**\r
     * @notice Execute USDC→CAC swap with balance verification\r
     * @dev Extracted to reduce stack depth in main function\r
     */\r
    function _executeUsdcToCacSwap(\r
        address swapper,\r
        SwapParams memory params,\r
        SwapState memory state\r
    ) internal {\r
        uint256 totalCacFromLP = params.minAmountOut + params.lpFee;\r
        \r
        // Verify balances before any transfer\r
        _verifyLPFunds(params.lpProvider, cacToken, totalCacFromLP);\r
        _verifySwapperFunds(swapper, usdcToken, params.amountIn);\r
        \r
        // Transfer USDC from swapper to LP\r
        usdcToken.safeTransferFrom(swapper, params.lpProvider, params.amountIn);\r
        \r
        // Get balance before CAC transfer\r
        uint256 balanceBefore = cacToken.balanceOf(swapper);\r
        \r
        // Transfer CAC from LP to swapper (includes LP fee)\r
        cacToken.safeTransferFrom(params.lpProvider, swapper, totalCacFromLP);\r
        \r
        // Calculate actual received (accounting for CAC's 1% transfer fee)\r
        uint256 actualReceived = cacToken.balanceOf(swapper) - balanceBefore;\r
        uint256 expectedMinimum = (totalCacFromLP * 99) / 100;\r
        \r
        if (actualReceived < expectedMinimum) revert SlippageExceeded();\r
        \r
        emit SwapExecuted(\r
            swapper,\r
            params.lpProvider,\r
            address(usdcToken),\r
            address(cacToken),\r
            params.amountIn,\r
            actualReceived,\r
            params.lpFee,\r
            state.currentNonce\r
        );\r
    }\r
\r
    /**\r
     * @notice Execute CAC→USDC swap with balance verification\r
     * @dev Extracted to reduce stack depth in main function\r
     */\r
    function _executeCacToUsdcSwap(\r
        address swapper,\r
        SwapParams memory params,\r
        SwapState memory state\r
    ) internal {\r
        uint256 totalUsdcFromLP = params.minAmountOut + params.lpFee;\r
        \r
        // Verify balances before any transfer\r
        _verifyLPFunds(params.lpProvider, usdcToken, totalUsdcFromLP);\r
        _verifySwapperFunds(swapper, cacToken, params.amountIn);\r
        \r
        // Transfer CAC from swapper to LP (CAC's 1% fee handled by token)\r
        cacToken.safeTransferFrom(swapper, params.lpProvider, params.amountIn);\r
        \r
        // Get balance before USDC transfer\r
        uint256 balanceBefore = usdcToken.balanceOf(swapper);\r
        \r
        // Transfer USDC from LP to swapper (includes LP fee)\r
        usdcToken.safeTransferFrom(params.lpProvider, swapper, totalUsdcFromLP);\r
        \r
        // Calculate actual received (USDC has no transfer fee)\r
        uint256 actualReceived = usdcToken.balanceOf(swapper) - balanceBefore;\r
        \r
        if (actualReceived < params.minAmountOut) revert SlippageExceeded();\r
        \r
        emit SwapExecuted(\r
            swapper,\r
            params.lpProvider,\r
            address(cacToken),\r
            address(usdcToken),\r
            params.amountIn,\r
            actualReceived,\r
            params.lpFee,\r
            state.currentNonce\r
        );\r
    }\r
\r
    // ============ Core Swap Functions ============\r
\r
    /**\r
     * @notice Swap USDC for CAC tokens\r
     * @dev Flow: Swapper sends USDC to LP, LP sends CAC (including 0.3% fee) to swapper\r
     * @dev Security: All checks done BEFORE any transfers (Checks-Effects-Interactions)\r
     * @param lpProvider Liquidity provider selected by backend\r
     * @param usdcAmount Amount of USDC swapper sends (6 decimals)\r
     * @param minCacAmount Minimum CAC swapper expects (slippage protection, 8 decimals)\r
     * @param lpFee Fee LP earns in CAC (8 decimals)\r
     * @param deadline Transaction expiration timestamp\r
     * @param salt Unique salt for this swap\r
     * @param signature Backend's EIP-712 signature\r
     */\r
    function swapUsdcForCac(\r
        address lpProvider,\r
        uint256 usdcAmount,\r
        uint256 minCacAmount,\r
        uint256 lpFee,\r
        uint256 deadline,\r
        bytes32 salt,\r
        bytes calldata signature\r
    ) external nonReentrant whenNotPaused {\r
        // ============ CHECKS ============\r
        _validateSwapInputs(lpProvider, deadline);\r
\r
        uint256 currentNonce = nonces[msg.sender];\r
\r
        _verifySignature(\r
            msg.sender,\r
            lpProvider,\r
            usdcAmount,\r
            minCacAmount,\r
            lpFee,\r
            deadline,\r
            currentNonce,\r
            salt,\r
            signature\r
        );\r
\r
        // ============ EFFECTS ============\r
        nonces[msg.sender]++;\r
\r
        // ============ INTERACTIONS ============\r
        SwapParams memory params = SwapParams(\r
            lpProvider,\r
            usdcAmount,\r
            minCacAmount,\r
            lpFee,\r
            deadline,\r
            salt,\r
            signature\r
        );\r
\r
        SwapState memory state = SwapState(currentNonce, 0, 0, 0);\r
\r
        _executeUsdcToCacSwap(msg.sender, params, state);\r
    }\r
\r
    /**\r
     * @notice Swap CAC for USDC tokens\r
     * @dev Flow: Swapper sends CAC to LP, LP sends USDC (including 0.3% fee) to swapper\r
     * @dev Security: All checks done BEFORE any transfers (Checks-Effects-Interactions)\r
     * @param lpProvider Liquidity provider selected by backend\r
     * @param cacAmount Amount of CAC swapper sends (8 decimals)\r
     * @param minUsdcAmount Minimum USDC swapper expects (slippage protection, 6 decimals)\r
     * @param lpFee Fee LP earns in USDC (6 decimals)\r
     * @param deadline Transaction expiration timestamp\r
     * @param salt Unique salt for this swap\r
     * @param signature Backend's EIP-712 signature\r
     */\r
    function swapCacForUsdc(\r
        address lpProvider,\r
        uint256 cacAmount,\r
        uint256 minUsdcAmount,\r
        uint256 lpFee,\r
        uint256 deadline,\r
        bytes32 salt,\r
        bytes calldata signature\r
    ) external nonReentrant whenNotPaused {\r
        // ============ CHECKS ============\r
        _validateSwapInputs(lpProvider, deadline);\r
\r
        uint256 currentNonce = nonces[msg.sender];\r
\r
        _verifySignature(\r
            msg.sender,\r
            lpProvider,\r
            cacAmount,\r
            minUsdcAmount,\r
            lpFee,\r
            deadline,\r
            currentNonce,\r
            salt,\r
            signature\r
        );\r
\r
        // ============ EFFECTS ============\r
        nonces[msg.sender]++;\r
\r
        // ============ INTERACTIONS ============\r
        SwapParams memory params = SwapParams(\r
            lpProvider,\r
            cacAmount,\r
            minUsdcAmount,\r
            lpFee,\r
            deadline,\r
            salt,\r
            signature\r
        );\r
\r
        SwapState memory state = SwapState(currentNonce, 0, 0, 0);\r
\r
        _executeCacToUsdcSwap(msg.sender, params, state);\r
    }\r
\r
    // ============ Emergency Functions ============\r
\r
    function emergencyPause() external onlyOwner {\r
        if (paused) revert ContractPaused();\r
        paused = true;\r
        emit EmergencyPause(msg.sender);\r
    }\r
\r
    function emergencyUnpause() external onlyOwner {\r
        if (!paused) revert NotPaused();\r
        paused = false;\r
        emit EmergencyUnpause(msg.sender);\r
    }\r
\r
    /**\r
     * @notice Rescue accidentally sent tokens\r
     * @dev Contract should normally have ZERO balance (approval-based model)\r
     * @param token Token address to rescue\r
     * @param amount Amount to rescue\r
     * @param to Recipient address\r
     */\r
    function rescueTokens(\r
        address token,\r
        uint256 amount,\r
        address to\r
    ) external onlyOwner {\r
        if (to == address(0)) revert ZeroAddress();\r
        if (token == address(0)) revert ZeroAddress();\r
        if (amount == 0) revert ZeroAmount();\r
        \r
        IERC20(token).safeTransfer(to, amount);\r
        emit TokensRescued(token, amount, to);\r
    }\r
\r
    // ============ Admin Functions (2-Step Updates with Timelock) ============\r
\r
    function proposeTrustedSigner(address newSigner) external onlyOwner {\r
        if (newSigner == address(0)) revert ZeroAddress();\r
        if (newSigner == trustedSigner) revert SameValue();\r
        \r
        pendingTrustedSigner = newSigner;\r
        signerProposalTime = block.timestamp;\r
        \r
        emit TrustedSignerProposed(msg.sender, newSigner, block.timestamp);\r
    }\r
\r
    function acceptTrustedSigner() external {\r
        if (msg.sender != pendingTrustedSigner) revert NotPendingSigner();\r
        if (pendingTrustedSigner == address(0)) revert NoPendingSigner();\r
        if (block.timestamp < signerProposalTime + TIMELOCK_DURATION) revert TimelockNotExpired();\r
        \r
        address oldSigner = trustedSigner;\r
        trustedSigner = pendingTrustedSigner;\r
        pendingTrustedSigner = address(0);\r
        signerProposalTime = 0;\r
        \r
        emit TrustedSignerAccepted(oldSigner, trustedSigner);\r
    }\r
\r
    function setSwapFeeRate(uint256 newRate) external onlyOwner {\r
        if (newRate > 1000) revert InvalidFeeRate(); // Max 10% fee\r
        if (newRate == swapFeeRate) revert SameValue();\r
        \r
        uint256 oldRate = swapFeeRate;\r
        swapFeeRate = newRate;\r
        \r
        emit SwapFeeRateUpdated(oldRate, newRate);\r
    }\r
\r
    // ============ View Functions ============\r
\r
    function getNonce(address user) external view returns (uint256) {\r
        return nonces[user];\r
    }\r
\r
    function isPaused() external view returns (bool) {\r
        return paused;\r
    }\r
\r
    function getSwapFeeRate() external view returns (uint256) {\r
        return swapFeeRate;\r
    }\r
\r
    function getTokenAddresses() external view returns (address usdc, address cac) {\r
        return (address(usdcToken), address(cacToken));\r
    }\r
\r
    function getTrustedSigner() external view returns (address) {\r
        return trustedSigner;\r
    }\r
\r
    function getPendingTrustedSigner() external view returns (address, uint256) {\r
        return (pendingTrustedSigner, signerProposalTime);\r
    }\r
\r
    function getSystemStatus() external view returns (\r
        bool isPausedStatus,\r
        uint256 feeRate,\r
        address signer\r
    ) {\r
        return (\r
            paused,\r
            swapFeeRate,\r
            trustedSigner\r
        );\r
    }\r
\r
    /**\r
     * @notice Get domain separator for EIP-712\r
     * @dev Used by frontend/backend for signature generation\r
     */\r
    function DOMAIN_SEPARATOR() external view returns (bytes32) {\r
        return _domainSeparator;\r
    }\r
\r
    /**\r
     * @notice Check if LP can provide liquidity for a swap\r
     * @dev Helper function for backend to verify LP eligibility\r
     */\r
    function canLPProvide(\r
        address lpProvider,\r
        address token,\r
        uint256 amount\r
    ) external view returns (bool) {\r
        IERC20 tokenContract = IERC20(token);\r
        uint256 balance = tokenContract.balanceOf(lpProvider);\r
        uint256 allowance = tokenContract.allowance(lpProvider, address(this));\r
        \r
        return (balance >= amount && allowance >= amount);\r
    }\r
}\r
"
    },
    "@openzeppelin/contracts/utils/cryptography/ECDSA.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.20;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS
    }

    /**
     * @dev The signature derives the `address(0)`.
     */
    error ECDSAInvalidSignature();

    /**
     * @dev The signature has an invalid length.
     */
    error ECDSAInvalidSignatureLength(uint256 length);

    /**
     * @dev The signature has an S value that is in the upper half order.
     */
    error ECDSAInvalidSignatureS(bytes32 s);

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with `signature` or an error. This will not
     * return address(0) without also returning an error description. Errors are documented using an enum (error type)
     * and a bytes32 providing additional information about the error.
     *
     * If no error is returned, then the address can be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     */
    function tryRecover(
        bytes32 hash,
        bytes memory signature
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly ("memory-safe") {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength, bytes32(signature.length));
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM precompile allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {MessageHashUtils-toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, signature);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[ERC-2098 short signatures]
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        unchecked {
            bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
            // We do not check for an overflow here since the shift operation results in 0 or 1.
            uint8 v = uint8((uint256(vs) >> 255) + 27);
            return tryRecover(hash, v, r, s);
        }
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, r, vs);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address recovered, RecoverError err, bytes32 errArg) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS, s);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature, bytes32(0));
        }

        return (signer, RecoverError.NoError, bytes32(0));
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error, bytes32 errorArg) = tryRecover(hash, v, r, s);
        _throwError(error, errorArg);
        return recovered;
    }

    /**
     * @dev Optionally reverts with the corresponding custom error according to the `error` argument provided.
     */
    function _throwError(RecoverError error, bytes32 errorArg) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert ECDSAInvalidSignature();
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert ECDSAInvalidSignatureLength(uint256(errorArg));
        } else if (error == RecoverError.InvalidSignatureS) {
            revert ECDSAInvalidSignatureS(errorArg);
        }
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}
"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @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);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "@openzeppelin/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": [],
    "evmVersion": "shanghai"
  }
}}