NEBASaleV3

{{
  "language": "Solidity",
  "sources": {
    "contracts/NEBASaleV3_Staged.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/cryptography/EIP712.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "./interfaces/IVestingEscrow.sol";

/**
 * @title NEBA Token Sale V3 - Stage-Based with Vesting + ETH Support
 * @notice Production-parity staged token sale with vesting integration
 * @dev Multi-stage sale with different prices, caps, and vesting schedules
 *
 * Key Features:
 * - 6 distinct sale stages (Seed, Community, Strategic, KOL, Public, Liquidity)
 * - ETH + USDC + USDT payment methods
 * - $25 USD minimum purchase (validated off-chain)
 * - NO maximum per wallet/transaction
 * - Stage-specific vesting schedules
 * - Integration with VestingEscrow contract
 * - EIP-712 signature-based purchases with paymentMethod field
 */
contract NEBASaleV3 is AccessControl, ReentrancyGuard, Pausable, EIP712 {
    using SafeERC20 for IERC20;

    // =============================================================
    //                           ROLES
    // =============================================================

    bytes32 public constant GOVERNANCE_ROLE = keccak256("GOVERNANCE_ROLE");
    bytes32 public constant OPERATIONS_ROLE = keccak256("OPERATIONS_ROLE");
    bytes32 public constant SIGNER_ROLE = keccak256("SIGNER_ROLE");

    // =============================================================
    //                        CONSTANTS
    // =============================================================

    /// @notice Minimum purchase amount in USD (6 decimals) - validated off-chain
    uint256 public constant MIN_USD_AMOUNT = 25 * 1e6; // $25

    /// @notice USDC/USDT decimals
    uint256 public constant STABLECOIN_DECIMALS = 6;

    /// @notice NEBA token decimals
    uint256 public constant NEBA_DECIMALS = 18;

    /// @notice ETH address constant (zero address represents native ETH)
    address public constant ETH_ADDRESS = address(0);

    // =============================================================
    //                        SALE STAGES
    // =============================================================

    enum Stage {
        Seed,       // 0: Off-chain/SAFT - buyEnabled = false
        Community,  // 1: Fjord - buyEnabled = false
        Strategic,  // 2: Private sale - buyEnabled = true
        KOL,        // 3: KOL sale - buyEnabled = true/optional
        Public,     // 4: Launchpads - buyEnabled = false
        Liquidity   // 5: LP @ TGE - out of Sales scope
    }

    struct StageConfig {
        uint256 cap;           // Total NEBA tokens available for this stage (18 decimals)
        uint256 priceUSD;      // Price per NEBA in USD (6 decimals)
        uint256 sold;          // Total NEBA tokens sold in this stage (18 decimals)
        bool buyEnabled;       // Whether direct purchases are enabled
        uint256 tgeUnlockBps;  // TGE unlock percentage in basis points (10000 = 100%)
        uint256 cliffMonths;   // Cliff period in months
        uint256 vestingMonths; // Linear vesting period in months
        bool dailyUnlock;      // True for daily unlock, false for monthly
    }

    // =============================================================
    //                        STATE VARIABLES
    // =============================================================

    /// @notice NEBA token contract
    IERC20 public immutable nebaToken;

    /// @notice Treasury address (receives stablecoins and ETH)
    address public immutable treasury;

    /// @notice VestingEscrow contract (receives vested tokens)
    address public vestingEscrow;

    /// @notice USDC token address
    IERC20 public immutable usdc;

    /// @notice USDT token address
    IERC20 public immutable usdt;

    /// @notice Stage configurations
    mapping(Stage => StageConfig) public stages;

    /// @notice Total tokens purchased by user in a specific stage
    mapping(address => mapping(Stage => uint256)) public userPurchases;

    /// @notice Total purchases across all stages by user
    mapping(address => uint256) public totalUserPurchases;

    /// @notice Total number of purchase transactions
    uint256 public totalPurchaseCount;

    /// @notice Nonce for signature replay protection
    mapping(address => uint256) public nonces;

    /// @notice Used nonces to prevent replay attacks
    mapping(address => mapping(uint256 => bool)) public usedNonces;

    /// @notice Maximum purchase amount per transaction (0 = no limit)
    uint256 public maxPurchasePerTx;

    /// @notice Minimum NEBA purchase amount (in NEBA tokens, 18 decimals)
    uint256 public minPurchaseAmount;

    // =============================================================
    //                           EVENTS
    // =============================================================

    event TokensPurchased(
        address indexed buyer,
        Stage indexed stage,
        string paymentMethod,
        uint256 amountPaid,
        uint256 nebaAmount,
        uint256 timestamp
    );

    event StageConfigured(
        Stage indexed stage,
        uint256 cap,
        uint256 priceUSD,
        bool buyEnabled
    );

    event StageBuyStatusChanged(Stage indexed stage, bool buyEnabled);
    event VestingEscrowUpdated(address indexed oldEscrow, address indexed newEscrow);
    event EmergencyWithdrawal(address indexed token, address indexed to, uint256 amount);

    // =============================================================
    //                          ERRORS
    // =============================================================

    error ZeroAddressNotAllowed();
    error ZeroAmountNotAllowed();
    error InvalidStage();
    error StageBuyingDisabled();
    error StageSoldOut();
    error BelowMinimumPurchase();
    error InsufficientStageAllocation();
    error InvalidSignature();
    error SignatureExpired();
    error InvalidPaymentMethod();
    error InsufficientETHSent();
    error VestingEscrowNotSet();
    error InvalidAmountForPaymentMethod();
    error NonceAlreadyUsed();
    error InsufficientBalance();
    error ExceedsMaxPurchasePerTx();
    error BelowMinPurchaseAmount();

    // =============================================================
    //                        EIP-712 TYPES
    // =============================================================

    bytes32 private constant PURCHASE_TYPEHASH = keccak256(
        "Purchase(address buyer,uint8 stage,string paymentMethod,uint256 amount,uint256 nebaAmount,uint256 nonce,uint256 deadline)"
    );

    // =============================================================
    //                       CONSTRUCTOR
    // =============================================================

    constructor(
        address _nebaToken,
        address _treasury,
        address _usdc,
        address _usdt,
        address _signer,
        address _governanceSafe,
        address _operationsSafe
    ) EIP712("NEBA Sale", "1") {
        if (_nebaToken == address(0)) revert ZeroAddressNotAllowed();
        if (_treasury == address(0)) revert ZeroAddressNotAllowed();
        if (_usdc == address(0)) revert ZeroAddressNotAllowed();
        if (_usdt == address(0)) revert ZeroAddressNotAllowed();
        if (_signer == address(0)) revert ZeroAddressNotAllowed();
        if (_governanceSafe == address(0)) revert ZeroAddressNotAllowed();
        if (_operationsSafe == address(0)) revert ZeroAddressNotAllowed();

        nebaToken = IERC20(_nebaToken);
        treasury = _treasury;
        usdc = IERC20(_usdc);
        usdt = IERC20(_usdt);

        // Grant roles
        _grantRole(DEFAULT_ADMIN_ROLE, _governanceSafe);
        _grantRole(GOVERNANCE_ROLE, _governanceSafe);
        _grantRole(OPERATIONS_ROLE, _operationsSafe);
        _grantRole(SIGNER_ROLE, _signer);

        // Initialize stage configurations
        _initializeStages();
    }

    // =============================================================
    //                    STAGE INITIALIZATION
    // =============================================================

    /**
     * @dev Initializes all sale stages with production parameters
     */
    function _initializeStages() private {
        // Seed: 100M NEBA @ $0.008 — OFF-CHAIN/SAFT
        // Vesting: 5% @TGE / 6m cliff / 24m linear
        stages[Stage.Seed] = StageConfig({
            cap: 100_000_000 ether,
            priceUSD: 8000, // $0.008 = 0.008 * 1,000,000 = 8,000 (6 decimals)
            sold: 0,
            buyEnabled: false,
            tgeUnlockBps: 500,    // 5%
            cliffMonths: 6,
            vestingMonths: 24,
            dailyUnlock: false
        });

        // Community: 25M NEBA @ $0.010 — FJORD
        // Vesting: 10% @TGE / 1m cliff / 12m daily
        stages[Stage.Community] = StageConfig({
            cap: 25_000_000 ether,
            priceUSD: 10000, // $0.010 = 0.010 * 1,000,000 = 10,000 (6 decimals)
            sold: 0,
            buyEnabled: false,
            tgeUnlockBps: 1000,   // 10%
            cliffMonths: 1,
            vestingMonths: 12,
            dailyUnlock: true
        });

        // Strategic/Private: 100M NEBA @ $0.012 — ACTIVE
        // Vesting: 12.5% @TGE / 3m cliff / 6m linear
        stages[Stage.Strategic] = StageConfig({
            cap: 100_000_000 ether,
            priceUSD: 12000, // $0.012 = 0.012 * 1,000,000 = 12,000 (6 decimals)
            sold: 0,
            buyEnabled: true,
            tgeUnlockBps: 1250,   // 12.5%
            cliffMonths: 3,
            vestingMonths: 6,
            dailyUnlock: false
        });

        // KOL: 20M NEBA @ $0.015 — OPTIONAL
        // Vesting: 20% @TGE / 3m cliff / 12m linear
        stages[Stage.KOL] = StageConfig({
            cap: 20_000_000 ether,
            priceUSD: 15000, // $0.015 = 0.015 * 1,000,000 = 15,000 (6 decimals)
            sold: 0,
            buyEnabled: true,
            tgeUnlockBps: 2000,   // 20%
            cliffMonths: 3,
            vestingMonths: 12,
            dailyUnlock: false
        });

        // Public: 20M NEBA @ $0.020 — LAUNCHPADS
        // Vesting: 20% @TGE / 0m cliff / 6m linear
        stages[Stage.Public] = StageConfig({
            cap: 20_000_000 ether,
            priceUSD: 20000, // $0.020 = 0.020 * 1,000,000 = 20,000 (6 decimals)
            sold: 0,
            buyEnabled: false,
            tgeUnlockBps: 2000,   // 20%
            cliffMonths: 0,
            vestingMonths: 6,
            dailyUnlock: false
        });

        // Liquidity: 75M NEBA @ $0.24 — OUT OF SALES SCOPE (LP @ TGE)
        stages[Stage.Liquidity] = StageConfig({
            cap: 75_000_000 ether,
            priceUSD: 240000, // $0.24 = 0.24 * 1,000,000 = 240,000 (6 decimals)
            sold: 0,
            buyEnabled: false,
            tgeUnlockBps: 10000,  // 100% (immediate liquidity)
            cliffMonths: 0,
            vestingMonths: 0,
            dailyUnlock: false
        });
    }

    // =============================================================
    //                    PURCHASE FUNCTIONS
    // =============================================================

    /**
     * @notice Purchase NEBA tokens with backend signature
     * @dev Supports ETH, USDC, and USDT payments
     * @param stage Sale stage to purchase from
     * @param paymentMethod "ETH", "USDC", or "USDT"
     * @param amount For ETH: wei amount (18 decimals), For USDC/USDT: USD amount (6 decimals)
     * @param nebaAmount Exact NEBA tokens to receive (signed by backend)
     * @param deadline Signature expiration timestamp
     * @param signature Backend signature
     */
    function buyTokens(
        Stage stage,
        string calldata paymentMethod,
        uint256 amount,
        uint256 nebaAmount,
        uint256 deadline,
        bytes calldata signature
    ) external payable nonReentrant whenNotPaused {
        if (amount == 0) revert ZeroAmountNotAllowed();
        if (block.timestamp > deadline) revert SignatureExpired();

        // Verify stage exists and buying is enabled
        if (uint8(stage) > uint8(Stage.Liquidity)) revert InvalidStage();
        StageConfig storage stageConfig = stages[stage];
        if (!stageConfig.buyEnabled) revert StageBuyingDisabled();

        // Get current nonce for signature verification
        uint256 currentNonce = nonces[msg.sender];

        // Check if nonce has already been used (replay protection)
        if (usedNonces[msg.sender][currentNonce]) revert NonceAlreadyUsed();

        // Verify signature (includes paymentMethod, amount, and nebaAmount)
        bytes32 structHash = keccak256(
            abi.encode(
                PURCHASE_TYPEHASH,
                msg.sender,
                uint8(stage),
                keccak256(bytes(paymentMethod)),
                amount,
                nebaAmount,
                currentNonce,
                deadline
            )
        );
        bytes32 hash = _hashTypedDataV4(structHash);
        address signer = ECDSA.recover(hash, signature);
        if (!hasRole(SIGNER_ROLE, signer)) revert InvalidSignature();

        // Mark nonce as used BEFORE state changes (replay protection)
        usedNonces[msg.sender][currentNonce] = true;
        nonces[msg.sender]++;

        // Backend has already validated:
        // - $25 USD minimum
        // - Correct nebaAmount calculation
        // - Geo-blocking
        // - KYC (email, firstName, lastName)

        // Validate nebaAmount is not zero
        if (nebaAmount == 0) revert ZeroAmountNotAllowed();

        // Check minimum purchase amount (if set)
        if (minPurchaseAmount > 0 && nebaAmount < minPurchaseAmount) {
            revert BelowMinPurchaseAmount();
        }

        // Check maximum purchase per transaction (if set)
        if (maxPurchasePerTx > 0 && nebaAmount > maxPurchasePerTx) {
            revert ExceedsMaxPurchasePerTx();
        }

        // Check stage allocation BEFORE payment processing
        if (stageConfig.sold + nebaAmount > stageConfig.cap) {
            revert InsufficientStageAllocation();
        }

        // Process payment based on method
        bytes32 methodHash = keccak256(bytes(paymentMethod));

        if (methodHash == keccak256("ETH")) {
            // ETH payment: amount = wei amount, msg.value must match
            if (msg.value != amount) revert InsufficientETHSent();

            // Pre-flight check: verify buyer sent enough ETH
            if (msg.sender.balance < amount) revert InsufficientBalance();

            // Transfer ETH to treasury
            (bool success, ) = treasury.call{value: msg.value}("");
            require(success, "ETH transfer failed");

        } else if (methodHash == keccak256("USDC")) {
            // USDC payment: amount = USD amount (6 decimals)
            if (msg.value != 0) revert InvalidAmountForPaymentMethod();

            // Pre-flight check: verify buyer has enough USDC
            if (usdc.balanceOf(msg.sender) < amount) revert InsufficientBalance();

            // Pre-flight check: verify buyer approved enough USDC
            if (usdc.allowance(msg.sender, address(this)) < amount) revert InsufficientBalance();

            // Transfer USDC from buyer to treasury
            usdc.safeTransferFrom(msg.sender, treasury, amount);

        } else if (methodHash == keccak256("USDT")) {
            // USDT payment: amount = USD amount (6 decimals)
            if (msg.value != 0) revert InvalidAmountForPaymentMethod();

            // Pre-flight check: verify buyer has enough USDT
            if (usdt.balanceOf(msg.sender) < amount) revert InsufficientBalance();

            // Pre-flight check: verify buyer approved enough USDT
            if (usdt.allowance(msg.sender, address(this)) < amount) revert InsufficientBalance();

            // Transfer USDT from buyer to treasury
            usdt.safeTransferFrom(msg.sender, treasury, amount);

        } else {
            revert InvalidPaymentMethod();
        }

        // Update state (BEFORE token transfers for CEI pattern)
        stageConfig.sold += nebaAmount;
        userPurchases[msg.sender][stage] += nebaAmount;
        totalUserPurchases[msg.sender] += nebaAmount;
        totalPurchaseCount++;

        // Transfer NEBA tokens to VestingEscrow or buyer
        if (stageConfig.vestingMonths > 0) {
            // Vesting required - ensure VestingEscrow is configured
            if (vestingEscrow == address(0)) revert VestingEscrowNotSet();

            // Transfer tokens to vesting escrow
            nebaToken.safeTransferFrom(treasury, vestingEscrow, nebaAmount);

            // Create vesting schedule immediately
            IVestingEscrow(vestingEscrow).createVestingSchedule(
                msg.sender,
                nebaAmount,
                stageConfig.tgeUnlockBps,
                stageConfig.cliffMonths,
                stageConfig.vestingMonths,
                stageConfig.dailyUnlock
            );
        } else {
            // Direct transfer (100% TGE unlock or no vesting)
            nebaToken.safeTransferFrom(treasury, msg.sender, nebaAmount);
        }

        emit TokensPurchased(
            msg.sender,
            stage,
            paymentMethod,
            amount,
            nebaAmount,
            block.timestamp
        );
    }

    /**
     * @notice Receive ETH for direct purchases
     * @dev Must use buyTokens() with signature - direct ETH sends will revert
     */
    receive() external payable {
        // Reject direct ETH sends without buyTokens() call
        revert("Use buyTokens() function");
    }

    // =============================================================
    //                    GOVERNANCE FUNCTIONS
    // =============================================================

    /**
     * @notice Configure a sale stage
     * @param stage Stage to configure
     * @param cap New token cap (18 decimals)
     * @param priceUSD New price in USD (6 decimals)
     * @param buyEnabled Whether buying is enabled
     */
    function configureStage(
        Stage stage,
        uint256 cap,
        uint256 priceUSD,
        bool buyEnabled,
        uint256 tgeUnlockBps,
        uint256 cliffMonths,
        uint256 vestingMonths,
        bool dailyUnlock
    ) external onlyRole(GOVERNANCE_ROLE) {
        if (uint8(stage) > uint8(Stage.Liquidity)) revert InvalidStage();

        StageConfig storage stageConfig = stages[stage];
        stageConfig.cap = cap;
        stageConfig.priceUSD = priceUSD;
        stageConfig.buyEnabled = buyEnabled;
        stageConfig.tgeUnlockBps = tgeUnlockBps;
        stageConfig.cliffMonths = cliffMonths;
        stageConfig.vestingMonths = vestingMonths;
        stageConfig.dailyUnlock = dailyUnlock;

        emit StageConfigured(stage, cap, priceUSD, buyEnabled);
    }

    /**
     * @notice Enable or disable buying for a stage
     * @param stage Stage to modify
     * @param enabled New buy status
     */
    function setStageBuyStatus(
        Stage stage,
        bool enabled
    ) external onlyRole(OPERATIONS_ROLE) {
        if (uint8(stage) > uint8(Stage.Liquidity)) revert InvalidStage();
        stages[stage].buyEnabled = enabled;
        emit StageBuyStatusChanged(stage, enabled);
    }

    /**
     * @notice Set the VestingEscrow contract address
     * @param _vestingEscrow Address of VestingEscrow contract
     */
    function setVestingEscrow(address _vestingEscrow) external onlyRole(GOVERNANCE_ROLE) {
        if (_vestingEscrow == address(0)) revert ZeroAddressNotAllowed();

        // Verify it's a contract (not EOA)
        uint256 codeSize;
        assembly {
            codeSize := extcodesize(_vestingEscrow)
        }
        require(codeSize > 0, "VestingEscrow must be a contract");

        address oldEscrow = vestingEscrow;
        vestingEscrow = _vestingEscrow;
        emit VestingEscrowUpdated(oldEscrow, _vestingEscrow);
    }

    /**
     * @notice Set maximum purchase amount per transaction
     * @param _maxPurchase Maximum NEBA amount (18 decimals), 0 = no limit
     */
    function setMaxPurchasePerTx(uint256 _maxPurchase) external onlyRole(GOVERNANCE_ROLE) {
        maxPurchasePerTx = _maxPurchase;
    }

    /**
     * @notice Set minimum purchase amount
     * @param _minPurchase Minimum NEBA amount (18 decimals), 0 = no limit
     */
    function setMinPurchaseAmount(uint256 _minPurchase) external onlyRole(GOVERNANCE_ROLE) {
        minPurchaseAmount = _minPurchase;
    }

    /**
     * @notice Pause the contract
     */
    function pause() external onlyRole(OPERATIONS_ROLE) {
        _pause();
    }

    /**
     * @notice Unpause the contract
     */
    function unpause() external onlyRole(GOVERNANCE_ROLE) {
        _unpause();
    }

    /**
     * @notice Emergency withdrawal of tokens or ETH
     * @param token Token address (address(0) for ETH)
     * @param to Recipient address
     * @param amount Amount to withdraw
     */
    function emergencyWithdraw(
        address token,
        address to,
        uint256 amount
    ) external onlyRole(GOVERNANCE_ROLE) {
        if (to == address(0)) revert ZeroAddressNotAllowed();
        if (amount == 0) revert ZeroAmountNotAllowed();

        if (token == address(0)) {
            // Withdraw ETH
            (bool success, ) = to.call{value: amount}("");
            require(success, "ETH transfer failed");
        } else {
            IERC20(token).safeTransfer(to, amount);
        }

        emit EmergencyWithdrawal(token, to, amount);
    }

    // =============================================================
    //                      VIEW FUNCTIONS
    // =============================================================

    /**
     * @notice Get stage configuration
     * @param stage Stage to query
     * @return StageConfig struct
     */
    function getStageConfig(Stage stage) external view returns (StageConfig memory) {
        return stages[stage];
    }

    /**
     * @notice Get remaining tokens available in a stage
     * @param stage Stage to query
     * @return Remaining tokens (18 decimals)
     */
    function getStageRemaining(Stage stage) external view returns (uint256) {
        StageConfig storage stageConfig = stages[stage];
        return stageConfig.cap - stageConfig.sold;
    }

    /**
     * @notice Calculate NEBA amount for a given USD amount
     * @param stage Stage to calculate for
     * @param amountUSD USD amount (6 decimals)
     * @return NEBA amount (18 decimals)
     */
    function calculateNebaAmount(
        Stage stage,
        uint256 amountUSD
    ) external view returns (uint256) {
        StageConfig storage stageConfig = stages[stage];
        return (amountUSD * 10**NEBA_DECIMALS) / stageConfig.priceUSD;
    }

    /**
     * @notice Get user's purchase info for a specific stage
     * @param user User address
     * @param stage Stage to query
     * @return Amount of NEBA purchased in this stage
     */
    function getUserPurchaseInStage(
        address user,
        Stage stage
    ) external view returns (uint256) {
        return userPurchases[user][stage];
    }

    /**
     * @notice Get total NEBA sold across all stages
     * @return Total NEBA sold (18 decimals)
     */
    function getTotalSold() external view returns (uint256) {
        uint256 total = 0;
        for (uint8 i = 0; i <= uint8(Stage.Liquidity); i++) {
            total += stages[Stage(i)].sold;
        }
        return total;
    }

    /**
     * @notice Check if a stage is sold out
     * @param stage Stage to check
     * @return True if sold out
     */
    function isStageSoldOut(Stage stage) external view returns (bool) {
        StageConfig storage stageConfig = stages[stage];
        return stageConfig.sold >= stageConfig.cap;
    }

    /**
     * @notice Get minimum NEBA purchase amount for a stage
     * @param stage Stage to calculate for
     * @return Minimum NEBA amount (18 decimals)
     */
    function getMinimumNebaForStage(Stage stage) external view returns (uint256) {
        StageConfig storage stageConfig = stages[stage];
        return (MIN_USD_AMOUNT * 10**NEBA_DECIMALS) / stageConfig.priceUSD;
    }

    /**
     * @notice Get EIP-712 domain separator
     * @return Domain separator hash
     */
    function getDomainSeparator() external view returns (bytes32) {
        return _domainSeparatorV4();
    }
}
"
    },
    "node_modules/@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);
}
"
    },
    "node_modules/@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);
    }
}
"
    },
    "node_modules/@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;
    }
}
"
    },
    "node_modules/@openzeppelin/contracts/utils/Pausable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
"
    },
    "node_modules/@openzeppelin/contracts/access/AccessControl.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (access/AccessControl.sol)

pragma solidity ^0.8.20;

import {IAccessControl} from "./IAccessControl.sol";
import {Context} from "../utils/Context.sol";
import {IERC165, ERC165} from "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    mapping(bytes32 role => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    /// @inheritdoc IERC165
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        return _roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        if (!hasRole(role, account)) {
            _roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` from `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        if (hasRole(role, account)) {
            _roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}
"
    },
    "node_modules/@openzeppelin/contracts/utils/cryptography/EIP712.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/cryptography/EIP712.sol)

pragma solidity ^0.8.20;

import {MessageHashUtils} from "./MessageHashUtils.sol";
import {ShortStrings, ShortString} from "../ShortStrings.sol";
import {IERC5267} from "../../interfaces/IERC5267.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP-712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding scheme specified in the EIP requires a domain separator and a hash of the typed structured data, whose
 * encoding is very generic and therefore its implementation in Solidity is not feasible, thus this contract
 * does not implement the encoding itself. Protocols need to implement the type-specific encoding they need in order to
 * produce the hash of their typed data using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP-712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * NOTE: In the upgradeable version of this contract, the cached values will correspond to the address, and the domain
 * separator of the implementation contract. This will cause the {_domainSeparatorV4} function to always rebuild the
 * separator from the immutable values, which is cheaper than accessing a cached version in cold storage.
 *
 * @custom:oz-upgrades-unsafe-allow state-variable-immutable
 */
abstract contract EIP712 is IERC5267 {
    using ShortStrings for *;

    bytes32 private constant TYPE_HASH =
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");

    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _cachedDomainSeparator;
    uint256 private immutable _cachedChainId;
    address private immutable _cachedThis;

    bytes32 private immutable _hashedName;
    bytes32 private immutable _hashedVersion;

    ShortString private immutable _name;
    ShortString private immutable _version;
    // slither-disable-next-line constable-states
    string private _nameFallback;
    // slither-disable-next-line constable-states
    string private _versionFallback;

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP-712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        _name = name.toShortStringWithFallback(_nameFallback);
        _version = version.toShortStringWithFallback(_versionFallback);
        _hashedName = keccak256(bytes(name));
        _hashedVersion = keccak256(bytes(version));

        _cachedChainId = block.chainid;
        _cachedDomainSeparator = _buildDomainSeparator();
        _cachedThis = address(this);
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _cachedThis && block.chainid == _cachedChainId) {
            return _cachedDomainSeparator;
        } else {
            return _buildDomainSeparator();
        }
    }

    function _buildDomainSeparator() private view returns (bytes32) {
        return keccak256(abi.encode(TYPE_HASH, _hashedName, _hashedVersion, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return MessageHashUtils.toTypedDataHash(_domainSeparatorV4(), structHash);
    }

    /// @inheritdoc IERC5267
    function eip712Domain()
        public
        view
        virtual
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        )
    {
        return (
            hex"0f", // 01111
            _EIP712Name(),
            _EIP712Version(),
            block.chainid,
            address(this),
            bytes32(0),
            new uint256[](0)
        );
    }

    /**
     * @dev The name parameter for the EIP712 domain.
     *
     * NOTE: By default this function reads _name which is an immutable value.
     * It only reads from storage if necessary (in case the value is too large to fit in a ShortString).
     */
    // solhint-disable-next-line func-name-mixedcase
    function _EIP712Name() internal view returns (string memory) {
        return _name.toStringWithFallback(_nameFallback);
    }

    /**
     * @dev The version parameter for the EIP712 domain.
     *
     * NOTE: By default this function reads _version which is an immutable value.
     * It only reads from storage if necessary (in case the value is too large to fit in a ShortString).
     */
    // solhint-disable-next-line func-name-mixedcase
    function _EIP712Version() internal view returns (string memory) {
        return _version.toStringWithFallback(_versionFallback);
    }
}
"
    },
    "node_modules/@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