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/**
 *Submitted for verification at Etherscan.io on 2025-07-06
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.30;

/// @author powsey.eth
/// @title Validator withdrawal control contract enforcing caps and vesting periods
contract WithdrawalControlContract {

    //
    // Constants
    //

    // Releases within allowance: maximum cummulative amount that can be released over a period
    uint256 private constant ALLOWANCE_AMOUNT_WEI = 4 ether;
    // Releases within allowance: duration of a period
    uint256 private constant ALLOWANCE_PERIOD = 30 days;

    // Vesting mechanism: balance threshold above which a vesting period can be started, and below which it is closed
    uint256 private constant VESTING_THRESHOLD_WEI = 16 ether;
    // Vesting mechanism: duration of the vesting period, after which the balance can be released in full
    uint256 private constant VESTING_PERIOD = 30 days;

    // Constants for EIP-7002 execution layer triggerred validator withdrawals
    address private constant WITHDRAWAL_CONTRACT_ADDRESS = 0x00000961Ef480Eb55e80D19ad83579A64c007002;
    uint64 private constant WITHDRAWAL_AMOUNT_GWEI_RANGE_MIN = 1;
    uint64 private constant WITHDRAWAL_AMOUNT_GWEI_RANGE_MAX = 2048000000000; /* 2048 ETH */
    uint256 private constant WITHDRAWAL_FEE_WEI_RANGE_MIN = 1;
    uint256 private constant WITHDRAWAL_FEE_WEI_RANGE_MAX = 1000000000000000; /* 0.001 ETH */

    //
    // State variables
    //

    // Contract owner: the address that deployed the contract (cold wallet) for large withdrawal of vested assets
    address private _owner;

    // Hot wallet: address chosen at contract creation for small withdrawals within the allowance
    address private _hotwallet;

    // Vesting period: start timestamp
    uint256 private _vestingPeriodStartTs;

    // Release within allowance: start timestamp and remaining allowance
    uint256 private _allowanceStartTs;
    uint256 private _allowanceRemainingWei;

    // Timestamp after which the hotwallet can make the next validator withdrawal request
    uint256 private _nextHotwalletWithdrawalTs;

    // Reentrency guard state
    bool private transient _locked;

    //
    // Events
    //

    /// @notice Emitted when a vesting period is started
    /// @param startsat timestamp at which the vesting period starts
    /// @param endsat timestamp at which the vesting period will end 
    event VestingPeriodStarted(uint256 startsat, uint256 endsat);

    /// @notice Emitted when funds are released from the smart contract
    /// @param receiver address to which the funds were released
    /// @param amount amount released in wei
    event FundsReleased(address receiver, uint256 amount);

    /// @notice Emitted when execution layer validator withdrawal is initiated by the contract
    /// @param validator_pubkey public key of the validator from which funds are withdrawn
    /// @param amount_gwei amount withdrawn in gwei
    /// @param fee_wei withdrawal fees in wei (value of the withdrawai transaction)
    event ValidatorWithdrawalInitiated(bytes validator_pubkey, uint64 amount_gwei, uint256 fee_wei);

    /// @notice Emitted when execution layer validator voluntary exit is initiated by the contract
    /// @param validator_pubkey public key of the validator from which funds are withdrawn
    /// @param fee_wei withdrawal fees in wei (value of the withdrawai transaction)
    event ValidatorExitInitiated(bytes validator_pubkey, uint256 fee_wei);

    //
    // Errors
    //

    // Raised if Reentrancy check failed
    error ReentrancyCheckFailed();

    /// @notice Raised when the caller is not allowed to perform the requested action (has to be the owner)
    /// @param caller address of the caller that attempted the unauthorized operation
    /// @param owner address of the owner (cold wallet) allowed to interact with this contract
    /// @param hotwallet address of the hot wallet allowed to interact with this contract
    error Unauthorized(address caller, address owner, address hotwallet);

    /// @notice Raised if the requested amount is greated than the defined limit
    /// @param requested amount requested to be released in wei
    /// @param limit maximum amount that can be released at once in wei
    error AmountOffLimit(uint256 requested, uint256 limit);

    /// @notice Raised if the requested operation is not allowed at this time
    /// @param now current timestamp
    /// @param possibleafter time after which the operation will be possible
    error NotPossibleYet(uint256 now, uint256 possibleafter);

    /// @notice Raised when the contract balance is too low to perform the requested operation
    /// @param needed amount needed to perform the requested operation
    /// @param balance current balance available in the contract in wei
    error InsufficientBalance(uint256 needed, uint256 balance);

    /// @notice Raised if a provided parameter did not pass input validation
    error InvalidParamValue();

    /// @notice Raised if a call to an external function failed
    error ExternalCallFailed();

    //
    // Modifiers
    //

    /// @notice Prevents reentrancy attacks on functions calling external code
    modifier nonReentrant {
        if (_locked)
            revert ReentrancyCheckFailed();
        _locked = true;
        _;
        _locked = false;
    }

    //
    // Functions: constructor, receive, fallback
    //

    /// @notice Constructor that initializes the contract with the given release constraints
    /// @param hotwallet hot wallet address (disabled if set to 0)
    constructor(address hotwallet) {
        _owner = msg.sender;
        _hotwallet = hotwallet;
        _vestingPeriodStartTs = 0;
        _allowanceStartTs = block.timestamp;
        _allowanceRemainingWei = ALLOWANCE_AMOUNT_WEI;
        _nextHotwalletWithdrawalTs = block.timestamp;
    }

    // Allow to receive inbound transactions with funds
    receive() external payable {
    }
    fallback() external payable {
    }

    //
    // Functions: public
    //

    /// @notice Start a vesting period
    function startVestingPeriod() public {
        // only the contract owner can call this function
        if (msg.sender != _owner)
            revert Unauthorized({caller: msg.sender, owner: _owner, hotwallet: _hotwallet});

        // there must be at least VESTING_THRESHOLD_WEI in the contract
        if (address(this).balance < VESTING_THRESHOLD_WEI)
            revert InsufficientBalance({needed: VESTING_THRESHOLD_WEI, balance: address(this).balance});

        // there must not be another ongoing vesting period
        if (_vestingPeriodStartTs != 0)
            revert NotPossibleYet({now: block.timestamp, possibleafter: block.timestamp + VESTING_PERIOD});

        _vestingPeriodStartTs = block.timestamp;
        emit VestingPeriodStarted({startsat: block.timestamp, endsat: block.timestamp + VESTING_PERIOD});
    }

    /// @notice Request release of funds held in the contract
    /// @param amountWei amount to release in wei
    function releaseEther(uint256 amountWei) public nonReentrant {
        // make sure that the requested amount is valid and does not exceed the contract balance
        if (amountWei < 1)
            revert InvalidParamValue();
        if (amountWei > address(this).balance)
            revert InsufficientBalance({needed: amountWei, balance: address(this).balance});

        // only the contract owner and hot wallet (if defined) can call this function
        if (msg.sender == _owner)
            return releaseEtherToOwner(amountWei);
        else if (_hotwallet != address(0) && msg.sender == _hotwallet)
            return releaseEtherWithinAllowance(amountWei, false);
        revert Unauthorized({caller: msg.sender, owner: _owner, hotwallet: _hotwallet});
    }

    /// @notice Request an EL triggered withdrawal or exit for the specified validator (EIP-7002)
    /// @param validatorPubkey public key of the validator from which funds will be withdrawn
    /// @param amountGwei amount to withdraw in gwei or the special value of 0 to exit the validator
    /// @param feeWei withdrawal fees to pay in wei (value of the transaction)
    function withdrawValidator(bytes calldata validatorPubkey, uint64 amountGwei, uint256 feeWei) public nonReentrant {
        // input validation on parameters
        if (validatorPubkey.length != 48 ||
            !((amountGwei >= WITHDRAWAL_AMOUNT_GWEI_RANGE_MIN && amountGwei <= WITHDRAWAL_AMOUNT_GWEI_RANGE_MAX) || amountGwei == 0) ||
            feeWei < WITHDRAWAL_FEE_WEI_RANGE_MIN || feeWei > WITHDRAWAL_FEE_WEI_RANGE_MAX)
            revert InvalidParamValue();

        // contract balance must be enough to cover withdrawal fees
        if (address(this).balance < feeWei)
            revert InsufficientBalance({needed: feeWei, balance: address(this).balance});

        // only the contract owner or hotwallet can call this function
        if (_hotwallet != address(0) && msg.sender == _hotwallet) {
            // for hotwallet: only once per allowance period, and no more than the maximum allowance amount
            if (amountGwei < WITHDRAWAL_AMOUNT_GWEI_RANGE_MIN || amountGwei > (ALLOWANCE_AMOUNT_WEI / 1 gwei))
                revert AmountOffLimit({requested: amountGwei * 1 gwei, limit: ALLOWANCE_AMOUNT_WEI});
            if (block.timestamp < _nextHotwalletWithdrawalTs)
                revert NotPossibleYet(block.timestamp, _nextHotwalletWithdrawalTs);
            _nextHotwalletWithdrawalTs = block.timestamp + ALLOWANCE_PERIOD;
        }
        else if (msg.sender != _owner)
        {
            revert Unauthorized({caller: msg.sender, owner: _owner, hotwallet: _hotwallet});
        }

        (bool success,) = WITHDRAWAL_CONTRACT_ADDRESS.call{value: feeWei}(abi.encodePacked(validatorPubkey, amountGwei));
        if (!success)
            revert ExternalCallFailed();

        if (amountGwei > 0)
            emit ValidatorWithdrawalInitiated(validatorPubkey, amountGwei, feeWei);
        else
            emit ValidatorExitInitiated(validatorPubkey, feeWei);
    }

    /// @notice Revoke the defined hotwallet, preventing it from interacting with the contract
    function revokeHotwallet() public {
        // only the contract owner can call this function
        if (msg.sender != _owner)
            revert Unauthorized({caller: msg.sender, owner: _owner, hotwallet: _hotwallet});

        _hotwallet = address(0);
    }

    /// @notice Get information about the contract state
    /// @return ownerAddress contract owner address
    /// @return hotwalletAddress hotwallet address (0 if not defined or revoked)
    /// @return balanceWei amount currently held in the contract in wei
    /// @return nextHotwalletWithdrawalTs time after which the hotwallet can make the next validator withdrawal request
    /// @return nextHotwalletWithdrawalMaxWei maximum amount the hotwallet can withdraw from the validator at once
    /// @return allowanceRemainingWei maximum amount that can still be released within the allowance
    /// @return vestingPeriodEndTs when vested funds will be fully available, or 0 if there are no vested funds
    function getState() public view returns (
        address ownerAddress,
        address hotwalletAddress,
        uint256 balanceWei,
        uint256 nextHotwalletWithdrawalTs,
        uint256 nextHotwalletWithdrawalMaxWei,
        uint256 allowanceRemainingWei,
        uint256 vestingPeriodEndTs
    ) {
        return (
            _owner,
            _hotwallet,
            address(this).balance,
            _nextHotwalletWithdrawalTs,
            ALLOWANCE_AMOUNT_WEI,
            ((block.timestamp > _allowanceStartTs + ALLOWANCE_PERIOD) ? ALLOWANCE_AMOUNT_WEI : _allowanceRemainingWei),
            getVestingPeriodEndTs()
        );
    }

    //
    // Functions: private
    //

    /// @notice Calculate the time at which the vesting period ends
    /// @return timestamp of the end of the current vesting period or 0 if no vesting period is active
    function getVestingPeriodEndTs() private view returns (uint256) {
        return ((_vestingPeriodStartTs != 0) ? _vestingPeriodStartTs + VESTING_PERIOD : 0);
    }

    /// @notice Handle fund release requests within allowance constraints
    /// @param amountWei requested amount in wei
    /// @param releaseToOwner whether the funds are released to the owner address (true) or the hot wallet (false)
    function releaseEtherWithinAllowance(uint256 amountWei, bool releaseToOwner) private {
        // replenish the allowance if the previous period had expired
        if (block.timestamp > _allowanceStartTs + ALLOWANCE_PERIOD) {
            _allowanceStartTs = block.timestamp;
            _allowanceRemainingWei = ALLOWANCE_AMOUNT_WEI;
        }

        // make sure that the requested amount does not exceed the remaining allowance
        if (amountWei > _allowanceRemainingWei)
            revert AmountOffLimit({requested: amountWei, limit: _allowanceRemainingWei});

        // update state
        _allowanceRemainingWei -= amountWei;
        if (_vestingPeriodStartTs != 0 && address(this).balance - amountWei < VESTING_THRESHOLD_WEI)
            _vestingPeriodStartTs = 0;

        // send the funds to the requested recipient
        address recipient = ((releaseToOwner) ? _owner : _hotwallet);
        (bool success,) = recipient.call{value: amountWei}("");
        if (!success)
            revert ExternalCallFailed();

        emit FundsReleased(recipient, amountWei);
    }

    /// @notice Handle fund release requests to the owner (cold wallet)
    /// @param amountWei requested amount in wei
    function releaseEtherToOwner(uint256 amountWei) private {
        uint256 vestingPeriodEndTs = getVestingPeriodEndTs();

        // if the vesting period has not ended yet, allow releases to the owner within the hot wallet allowance
        // this allows the cold wallet to be used as backup in case the hot wallet is lost or revoked
        if (vestingPeriodEndTs == 0 || block.timestamp < vestingPeriodEndTs)
            return releaseEtherWithinAllowance(amountWei, true);

        // update state
        if (_vestingPeriodStartTs != 0 && address(this).balance - amountWei < VESTING_THRESHOLD_WEI)
            _vestingPeriodStartTs = 0;

        // send the funds to owner
        (bool success,) = _owner.call{value: amountWei}("");
        if (!success)
            revert ExternalCallFailed();

        emit FundsReleased(_owner, amountWei);
    }
}

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[{"inputs":[{"internalType":"address","name":"hotwallet","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"requested","type":"uint256"},{"internalType":"uint256","name":"limit","type":"uint256"}],"name":"AmountOffLimit","type":"error"},{"inputs":[],"name":"ExternalCallFailed","type":"error"},{"inputs":[{"internalType":"uint256","name":"needed","type":"uint256"},{"internalType":"uint256","name":"balance","type":"uint256"}],"name":"InsufficientBalance","type":"error"},{"inputs":[],"name":"InvalidParamValue","type":"error"},{"inputs":[{"internalType":"uint256","name":"now","type":"uint256"},{"internalType":"uint256","name":"possibleafter","type":"uint256"}],"name":"NotPossibleYet","type":"error"},{"inputs":[],"name":"ReentrancyCheckFailed","type":"error"},{"inputs":[{"internalType":"address","name":"caller","type":"address"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"hotwallet","type":"address"}],"name":"Unauthorized","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"receiver","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FundsReleased","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes","name":"validator_pubkey","type":"bytes"},{"indexed":false,"internalType":"uint256","name":"fee_wei","type":"uint256"}],"name":"ValidatorExitInitiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes","name":"validator_pubkey","type":"bytes"},{"indexed":false,"internalType":"uint64","name":"amount_gwei","type":"uint64"},{"indexed":false,"internalType":"uint256","name":"fee_wei","type":"uint256"}],"name":"ValidatorWithdrawalInitiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"startsat","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"endsat","type":"uint256"}],"name":"VestingPeriodStarted","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"getState","outputs":[{"internalType":"address","name":"ownerAddress","type":"address"},{"internalType":"address","name":"hotwalletAddress","type":"address"},{"internalType":"uint256","name":"balanceWei","type":"uint256"},{"internalType":"uint256","name":"nextHotwalletWithdrawalTs","type":"uint256"},{"internalType":"uint256","name":"nextHotwalletWithdrawalMaxWei","type":"uint256"},{"internalType":"uint256","name":"allowanceRemainingWei","type":"uint256"},{"internalType":"uint256","name":"vestingPeriodEndTs","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountWei","type":"uint256"}],"name":"releaseEther","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"revokeHotwallet","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startVestingPeriod","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"validatorPubkey","type":"bytes"},{"internalType":"uint64","name":"amountGwei","type":"uint64"},{"internalType":"uint256","name":"feeWei","type":"uint256"}],"name":"withdrawValidator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000c2ac6204f37889977d92a236ceb6f98b04667d11

-----Decoded View---------------
Arg [0] : hotwallet (address): 0xC2aC6204f37889977D92A236CEB6f98b04667d11

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000c2ac6204f37889977d92a236ceb6f98b04667d11

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