XOEReserveVault

{{
  "language": "Solidity",
  "sources": {
    "src/XOEReserveVault.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

/// @title XOE Reserve Vault (Production-Ready)
/// @notice Secure custody contract for locked allocations and transaction fees.
contract XOEReserveVault is Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;

    IERC20 public xoeToken;
    uint256 public constant BRIDGE_LOCK_AMOUNT = 125_000_000 * 1e18;
    uint256 public constant NFT_REWARDS_LOCK_AMOUNT = 125_000_000 * 1e18;
    uint256 public bridgeUnlockTime;
    uint256 public nftRewardsUnlockTime;
    bool public bridgeAllocationReleased;
    bool public nftRewardsAllocationReleased;
    bool public tokenLinked;

    // Upgrade functionality
    address public newVault;
    uint256 public vaultUpgradeTime;
    uint256 public constant UPGRADE_DELAY = 7 days;
    uint256 public constant APPROVAL_DELAY = 1 days;
    mapping(address => bool) public approvedVaults;
    mapping(address => uint256) public vaultApprovalTime;

    // Access control
    address public feeManager;
    address public emergencyAdmin;

    // Analytics
    uint256 public totalFeesWithdrawn;
    uint256 public totalAllocationsReleased;

    // Events
    event TokenLinked(address indexed token);
    event TokenLinkFailed(address indexed token, string reason);
    event FeeTransferRegistered(address indexed from, uint256 amount);
    event AllocationReleased(string category, address indexed recipient, uint256 amount);
    event ExternalAssetRecovered(address indexed token, uint256 amount, address recipient);
    event FeesWithdrawn(address indexed recipient, uint256 amount);
    event VaultUpgradeProposed(address indexed newVault, uint256 effectiveTime);
    event VaultUpgradeExecuted(address indexed oldVault, address indexed newVault);
    event VaultUpgradeCanceled();
    event AnalyticsUpdated(uint256 totalFeesWithdrawn, uint256 totalAllocationsReleased);
    event EthWithdrawn(uint256 amount, address indexed recipient);
    event ApprovedVaultSet(address indexed vault, bool approved);
    event FeeManagerSet(address indexed feeManager);
    event EmergencyAdminSet(address indexed emergencyAdmin);
    event EmergencyWithdrawal(address indexed recipient, uint256 amount, string reason);

    constructor() Ownable(msg.sender) {
        bridgeUnlockTime = block.timestamp + 30 days;
        nftRewardsUnlockTime = block.timestamp + 180 days;
    }

    // Block renouncing ownership to prevent accidental loss of control
    function renounceOwnership() public pure override {
        revert("Ownership renouncement disabled");
    }

    /// @notice One-time link to the XOE token.
    /// @dev Enforces zero-address check to prevent contract from becoming unusable.
    function linkToken(address _xoeToken) external onlyOwner {
        require(!tokenLinked, "Token already linked");
        require(_xoeToken != address(0), "Zero address"); // Explicit check to prevent unusable state
        
        // Verify ERC20 interface by checking balanceOf function exists
        (bool success, ) = _xoeToken.staticcall(
            abi.encodeWithSignature("balanceOf(address)", address(this))
        );
        if (!success) {
            emit TokenLinkFailed(_xoeToken, "Not an ERC20 token");
            revert("Not an ERC20 token");
        }
        
        xoeToken = IERC20(_xoeToken);
        tokenLinked = true;
        emit TokenLinked(_xoeToken);
    }

    /// @notice Logs transaction fee transfers from the XOE token.
    /// @dev Can be called by feeManager or the XOE token contract itself.
    function registerFeeTransfer(address from, uint256 amount) external {
        require(
            msg.sender == feeManager || msg.sender == address(xoeToken),
            "Unauthorized"
        );
        emit FeeTransferRegistered(from, amount);
    }

    // ─────────────────────────────────────────────
    // Release Logic (Time-Locked)
    // ─────────────────────────────────────────────
    function releaseBridgeAllocation(address recipient) external onlyOwner nonReentrant {
        _releaseAllocation(
            "BRIDGE",
            recipient,
            BRIDGE_LOCK_AMOUNT,
            bridgeUnlockTime,
            bridgeAllocationReleased
        );
        bridgeAllocationReleased = true;
    }

    function releaseNftRewardsAllocation(address recipient) external onlyOwner nonReentrant {
        _releaseAllocation(
            "NFT_REWARDS",
            recipient,
            NFT_REWARDS_LOCK_AMOUNT,
            nftRewardsUnlockTime,
            nftRewardsAllocationReleased
        );
        nftRewardsAllocationReleased = true;
    }

    /// @dev Internal function to avoid code duplication.
    function _releaseAllocation(
        string memory category,
        address recipient,
        uint256 amount,
        uint256 unlockTime,
        bool storageFlag
    ) internal {
        require(tokenLinked, "Token not linked");
        require(block.timestamp >= unlockTime, "Allocation locked");
        require(!storageFlag, "Already released");
        require(recipient != address(0), "Invalid recipient");

        xoeToken.safeTransfer(recipient, amount);
        totalAllocationsReleased += amount;
        emit AllocationReleased(category, recipient, amount);
        emit AnalyticsUpdated(totalFeesWithdrawn, totalAllocationsReleased);
    }

    /// @notice Recover non-XOE ERC20 tokens.
    function recoverExternalAsset(
        address token,
        uint256 amount,
        address recipient
    ) external onlyOwner nonReentrant {
        require(token != address(0), "Zero token address");
        require(recipient != address(0), "Invalid recipient");
        require(token != address(xoeToken), "Use release functions for XOE");
        IERC20(token).safeTransfer(recipient, amount);
        emit ExternalAssetRecovered(token, amount, recipient);
    }

    /// @notice Withdraw accumulated fees.
    function withdrawFees(address recipient, uint256 amount) external onlyOwner nonReentrant {
        require(tokenLinked, "Token not linked");
        require(recipient != address(0), "Invalid recipient");
        require(amount > 0, "Zero amount");
        uint256 balance = xoeToken.balanceOf(address(this));
        require(amount <= balance, "Insufficient balance");

        xoeToken.safeTransfer(recipient, amount);
        totalFeesWithdrawn += amount;
        emit FeesWithdrawn(recipient, amount);
        emit AnalyticsUpdated(totalFeesWithdrawn, totalAllocationsReleased);
    }

    /// @notice Set the fee manager address (can call registerFeeTransfer).
    function setFeeManager(address _feeManager) external onlyOwner {
        feeManager = _feeManager;
        emit FeeManagerSet(_feeManager);
    }

    /// @notice Set the emergency admin address (can perform emergency withdrawals).
    function setEmergencyAdmin(address _emergencyAdmin) external onlyOwner {
        emergencyAdmin = _emergencyAdmin;
        emit EmergencyAdminSet(_emergencyAdmin);
    }

    /// @notice Get current fee balance.
    function getFeeBalance() external view returns (uint256) {
        require(tokenLinked, "Token not linked");
        return xoeToken.balanceOf(address(this));
    }

    // ─────────────────────────────────────────────
    // Upgrade Functionality
    // ─────────────────────────────────────────────
    /// @notice Approve a vault address for future upgrades (prevents front-running).
    /// @dev Requires APPROVAL_DELAY to pass before the vault can be proposed for upgrade.
    function setApprovedVault(address vault, bool approved) external onlyOwner {
        require(vault != address(0), "Zero address");
        if (approved) {
            // Only allow approval if it's a new approval or was previously unapproved
            require(
                vaultApprovalTime[vault] == 0 || !approvedVaults[vault],
                "Already approved"
            );
            approvedVaults[vault] = true;
            vaultApprovalTime[vault] = block.timestamp;
        } else {
            approvedVaults[vault] = false;
            // Reset timestamp when unapproving to require fresh approval delay on re-approval
            vaultApprovalTime[vault] = 0;
        }
        emit ApprovedVaultSet(vault, approved);
    }

    function proposeVaultUpgrade(address _newVault) external onlyOwner {
        require(_newVault != address(0), "Invalid new vault");
        require(_newVault != address(this), "Cannot upgrade to self");
        require(approvedVaults[_newVault], "Vault not approved");
        require(
            block.timestamp >= vaultApprovalTime[_newVault] + APPROVAL_DELAY,
            "Approval delay not elapsed"
        );
        newVault = _newVault;
        vaultUpgradeTime = block.timestamp + UPGRADE_DELAY;
        emit VaultUpgradeProposed(_newVault, vaultUpgradeTime);
    }

    function cancelVaultUpgrade() external onlyOwner {
        require(newVault != address(0), "No upgrade proposed");
        newVault = address(0);
        vaultUpgradeTime = 0;
        emit VaultUpgradeCanceled();
    }

    /// @notice Execute vault upgrade with slippage protection.
    /// @param minExpectedAmount Minimum expected balance (allows for small variations due to fees).
    function executeVaultUpgrade(uint256 minExpectedAmount) external onlyOwner nonReentrant {
        require(newVault != address(0), "No upgrade proposed");
        require(block.timestamp >= vaultUpgradeTime, "Upgrade delay not elapsed");

        uint256 balance = xoeToken.balanceOf(address(this));
        require(balance >= minExpectedAmount, "Balance too low");
        
        if (balance > 0) {
            xoeToken.safeTransfer(newVault, balance);
        }

        emit VaultUpgradeExecuted(address(this), newVault);
        newVault = address(0);
    }

    // ─────────────────────────────────────────────
    // ETH Handling
    // ─────────────────────────────────────────────
    function withdrawEth(address payable recipient, uint256 amount) external onlyOwner {
        require(amount <= address(this).balance, "Insufficient ETH");
        payable(recipient).transfer(amount);
        emit EthWithdrawn(amount, recipient);
    }

    /// @notice Sweep all ETH from the contract (protection against stuck ETH).
    /// @dev Callable by emergencyAdmin to recover ETH sent via selfdestruct or accidental transfers.
    function sweepEth(address payable recipient) external nonReentrant {
        require(msg.sender == emergencyAdmin, "Not emergency admin");
        require(recipient != address(0), "Invalid recipient");
        uint256 amount = address(this).balance;
        if (amount > 0) {
            payable(recipient).transfer(amount);
            emit EthWithdrawn(amount, recipient);
        }
    }

    // ─────────────────────────────────────────────
    // Analytics
    // ─────────────────────────────────────────────
    function getVaultAnalytics() external view returns (
        uint256 totalFees,
        uint256 totalAllocations,
        uint256 currentBalance,
        bool isUpgradeable
    ) {
        return (
            totalFeesWithdrawn,
            totalAllocationsReleased,
            tokenLinked ? xoeToken.balanceOf(address(this)) : 0,
            newVault != address(0) && block.timestamp >= vaultUpgradeTime
        );
    }

    // ─────────────────────────────────────────────
    // Emergency Functions
    // ─────────────────────────────────────────────
    /// @notice Emergency withdrawal function for locked funds if token contract is compromised.
    /// @dev Only callable by emergencyAdmin after both unlock times have passed.
    function emergencyWithdraw(address recipient, uint256 amount) external nonReentrant {
        require(msg.sender == emergencyAdmin, "Not emergency admin");
        require(recipient != address(0), "Invalid recipient");
        require(tokenLinked, "Token not linked");
        require(
            block.timestamp >= bridgeUnlockTime && block.timestamp >= nftRewardsUnlockTime,
            "Still locked"
        );
        
        // Only allow if allocations haven't been released yet (if released, use normal functions)
        require(!bridgeAllocationReleased && !nftRewardsAllocationReleased, "Already released");
        
        uint256 balance = xoeToken.balanceOf(address(this));
        require(amount <= balance, "Insufficient balance");
        
        xoeToken.safeTransfer(recipient, amount);
        emit EmergencyWithdrawal(recipient, amount, "Emergency admin withdrawal");
    }

    receive() external payable {}
}"
    },
    "lib/openzeppelin-contracts/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);
    }
}
"
    },
    "lib/openzeppelin-contracts/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);
}
"
    },
    "lib/openzeppelin-contracts/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);
    }
}
"
    },
    "lib/openzeppelin-contracts/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;
    }
}
"
    },
    "lib/openzeppelin-contracts/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;
    }
}
"
    },
    "lib/openzeppelin-contracts/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);
}
"
    },
    "lib/openzeppelin-contracts/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";
"
    },
    "lib/openzeppelin-contracts/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";
"
    },
    "lib/openzeppelin-contracts/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": {
    "remappings": [
      "@openzeppelin/=lib/openzeppelin-contracts/",
      "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
      "forge-std/=lib/forge-std/src/",
      "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
      "openzeppelin-contracts/=lib/openzeppelin-contracts/"
    ],
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "metadata": {
      "useLiteralContent": false,
      "bytecodeHash": "ipfs",
      "appendCBOR": true
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "evmVersion": "paris",
    "viaIR": false
  }
}}