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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity 0.8.23;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import {TokenRescuer} from "./base/TokenRescuer.sol";
import {ISafeTokenLock} from "./interfaces/ISafeTokenLock.sol";

/**
 * @title SafeTokenLock - A Locking Contract for Safe Tokens.
 * @author @safe-global/safe-protocol
 * @custom:security-contact [email protected]
 */
contract SafeTokenLock is ISafeTokenLock, TokenRescuer {
    /**
     * @notice Error indicating an attempt to use an invalid Safe token, whose {totalSupply} is greater than `type(uint96).max`.
     */
    error InvalidSafeToken();

    /**
     * @notice Error indicating an attempt to use zero as cooldown period value.
     */
    error InvalidCooldownPeriod();

    /**
     * @notice Error indicating an attempt to transfer Safe tokens out of the contract using the rescue mechanism.
     */
    error CannotRescueSafeToken();

    /**
     * @notice Error indicating an attempt to renounce ownership.
     */
    error RenounceOwnershipDisabled();

    /**
     * @inheritdoc ISafeTokenLock
     */
    address public immutable SAFE_TOKEN;

    /**
     * @inheritdoc ISafeTokenLock
     */
    uint64 public immutable COOLDOWN_PERIOD;

    /**
     * @dev A mapping from a `holder` to its {User} data.
     */
    mapping(address holder => User) internal _users;

    /**
     * @dev A mapping from an unlock `index` and its `holder` to the {UnlockInfo}.
     *      The inner-most mapping is on the `holder` {address}, ensuring that the storage is associated with the `holder` and allows the unlock information to be read during user operation validation in the context of ERC-4337.
     */
    mapping(uint32 index => mapping(address holder => UnlockInfo)) internal _unlocks;

    /**
     * @notice Creates a new instance of the Safe token locking contract.
     * @param initialOwner Initial owner of the contract.
     * @param safeToken Address of the Safe token. Passing it a token whose {totalSupply} is greater than `type(uint96).max` will revert with {InvalidSafeToken}.
     * @param cooldownPeriod The minimum period in seconds after which Safe token withdrawal can be performed. Passing zero will revert with {InvalidTokenAmount}.
     * @dev This contract uses {uint96} values for token amount accounting, meaning that the token's {totalSupply} must not overflow a {uint96}.
     *      This is checked by the constructor, but can be circumvented by inflationary tokens where the {totalSupply} can increase, which should not be used with this contract.
     *      Luckily the Safe token's {totalSupply} both fits in a {uint96} and is constant, meaning it works with this locking contract.
     *      The specified `safeToken` must follow the ERC-20 standard and revert on failed transfers.
     */
    constructor(address initialOwner, address safeToken, uint32 cooldownPeriod) Ownable(initialOwner) {
        if (IERC20(safeToken).totalSupply() > type(uint96).max) revert InvalidSafeToken();
        if (cooldownPeriod == 0) revert InvalidCooldownPeriod();

        SAFE_TOKEN = safeToken;
        COOLDOWN_PERIOD = cooldownPeriod;
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function lock(uint96 amount) external {
        if (amount == 0) revert InvalidTokenAmount();

        _users[msg.sender].locked += amount;

        IERC20(SAFE_TOKEN).transferFrom(msg.sender, address(this), amount);

        emit Locked(msg.sender, amount);
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function unlock(uint96 amount) external returns (uint32 index) {
        if (amount == 0) revert InvalidTokenAmount();

        User memory user = _users[msg.sender];
        if (user.locked < amount) revert UnlockAmountExceeded();

        // Use of unchecked math here is sound as we would have reverted if `user.locked < amount`,
        // meaning the following subtraction cannot overflow.
        uint96 locked;
        unchecked {
            locked = user.locked - amount;
        }

        index = user.unlockEnd;

        // Use unchecked math for computing the `maturesAt` timestamp for the unlock information.
        // This means that, in the case of overflows, we would create unlocks that immediately
        // mature, and allow tokens to be withdrawn before the intended time. However, since we use
        // a 64-bit timestamp, this can only happen for `maturesAt` values that would be greater
        // than 2**64, which is hundreds of billions of years in the future. Using unchecked math
        // here saves gas and code size, without any real downsides.
        unchecked {
            _unlocks[index][msg.sender] = UnlockInfo(amount, uint64(block.timestamp) + COOLDOWN_PERIOD);
        }

        // Note that it is possible here for `index + 1` to overflow and revert in the case where
        // `user.unlockEnd == type(uint32).max`. This means that after roughly 4 billion unlocks,
        // it is possible for funds to remain stuck in the locking contract. The amount of gas
        // required to perform 4 billion unlocks is prohibitively high, and we do not believe that
        // a user will realistically hit this limit.
        _users[msg.sender] = User(locked, user.unlocked + amount, user.unlockStart, index + 1);

        emit Unlocked(msg.sender, index, amount);
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function withdraw(uint32 maxUnlocks) external returns (uint96 amount) {
        User memory user = _users[msg.sender];
        uint32 index = user.unlockStart;
        uint32 withdrawEnd = user.unlockEnd;

        // Use of unchecked math here is sound as:
        // 1. `uint256(index) + uint256(maxUnlocks)` cannot overflow a `uint256`, as both are 32-bit
        //    integers, and thus have a maximum value of `0xffffffff` individually, making the
        //    maximum value of their sum as `0x1fffffffe`.
        // 2. `index + maxUnlocks` cannot overflow a `uint32`, as this line is only called if the
        //    check that `uint256(withdrawEnd) > uint256(index) + uint256(maxUnlocks)` is true,
        //    which implies that the sum is less than `withdrawEnd`, which is itself a `uint32`.
        unchecked {
            if (maxUnlocks != 0 && uint256(withdrawEnd) > uint256(index) + uint256(maxUnlocks)) {
                withdrawEnd = index + maxUnlocks;
            }
        }

        for (; index < withdrawEnd; index++) {
            UnlockInfo memory unlockInfo = _unlocks[index][msg.sender];
            if (unlockInfo.maturesAt > block.timestamp) break;

            // This contract maintains the invariant that `user.unlocked == ∑ unlockInfo.amount`,
            // therefore, `amount + unlockInfo.amount<= user.unlocked` and, since `user.unlocked` is
            // a `uint96`, this sum cannot overflow a `uint96`.
            unchecked {
                amount += unlockInfo.amount;
            }
            emit Withdrawn(msg.sender, index, unlockInfo.amount);
            delete _unlocks[index][msg.sender];
        }

        // Note that we disallow 0 amount `unlock`s. This means that if amount is non-0, that we
        // withdrew at least one unlock; i.e. `amount > 0 == index > user.unlockStart`.
        if (amount > 0) {
            // This contract maintains the invariant that `user.unlocked == ∑ unlockInfo.amount`,
            // therefore, `amount <= user.unlocked` and this subtraction cannot overflow.
            unchecked {
                _users[msg.sender] = User(user.locked, user.unlocked - amount, index, user.unlockEnd);
            }
            IERC20(SAFE_TOKEN).transfer(msg.sender, uint256(amount));
        }
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function getUserTokenBalance(address holder) external view returns (uint96 amount) {
        return _users[holder].locked + _users[holder].unlocked;
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function getUser(address holder) external view returns (User memory user) {
        user = _users[holder];
    }

    /**
     * @inheritdoc ISafeTokenLock
     */
    function getUnlock(address holder, uint32 index) external view returns (UnlockInfo memory unlockInfo) {
        unlockInfo = _unlocks[index][holder];
    }

    /**
     * @inheritdoc TokenRescuer
     */
    function _beforeTokenRescue(address token, address beneficiary, uint256 amount) internal override {
        if (token == SAFE_TOKEN) revert CannotRescueSafeToken();
        TokenRescuer._beforeTokenRescue(token, beneficiary, amount);
    }

    /**
     * @notice Disables renouncing ownership.
     * @dev Allowing renouncing ownership would make the Token Rescue mechanism unusable.
     *      `onlyOwner` modifier is removed as the function reverts on all cases.
     */
    function renounceOwnership() public pure override {
        revert RenounceOwnershipDisabled();
    }
}

// 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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {Ownable} from "./Ownable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 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 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 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 Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    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.
     */
    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.
     */
    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 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).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            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 silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert FailedInnerCall();
        }
    }
}

// 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;
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity 0.8.23;

import {Ownable2Step} from "@openzeppelin/contracts/access/Ownable2Step.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @title TokenRescuer - Rescuing accidentally transferred ERC20 tokens.
 * @author @safe-global/safe-protocol
 * @custom:security-contact [email protected]
 */
abstract contract TokenRescuer is Ownable2Step {
    using SafeERC20 for IERC20;

    /**
     * @dev Hook that gets called before rescuing a token.
     * @param token Token that should be rescued.
     * @param beneficiary The account that should receive the tokens.
     * @param amount Amount of tokens that should be rescued.
     */
    function _beforeTokenRescue(address token, address beneficiary, uint256 amount) internal virtual {}

    /**
     * @notice Rescues the specified `amount` of `tokens` to `beneficiary`. Can only be called by the {owner}.
     * @param token Token that should be rescued.
     * @param beneficiary The account that should receive the tokens.
     * @param amount Amount of tokens that should be rescued.
     */
    function rescueToken(address token, address beneficiary, uint256 amount) external onlyOwner {
        _beforeTokenRescue(token, beneficiary, amount);
        IERC20(token).safeTransfer(beneficiary, amount);
    }
}

// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity 0.8.23;

/**
 * @title ISafeTokenLock - The Interface for the Safe Token Locking Contract.
 * @author @safe-global/safe-protocol
 * @dev The contract describes the function signature and events used in the Safe token locking contract.
 * @custom:security-contact [email protected]
 */
interface ISafeTokenLock {
    /**
     * @notice Contains the user locked and unlocked token information, along with pending unlock indexes.
     * @param locked The total locked token amount for the user.
     * @param unlocked The total unlocked token amount for the user.
     * @param unlockStart The index of the first pending unlock for the user.
     * @param unlockEnd The end index of the pending unlocks.
     * @dev Note that `unlockEnd` does not correspond to an index of a pending unlock but instead the index of the next unlock to be added.
     *      Thus, `unlockStart == unlockEnd` implies that the user has no pending unlocks.
     */
    struct User {
        uint96 locked;
        uint96 unlocked;
        uint32 unlockStart;
        uint32 unlockEnd;
    }

    /**
     * @notice Contains information associated with a pending unlock.
     * @param amount The amount of tokens for the unlock.
     * @param maturesAt The timestamp the unlock will mature at, and become available for withdrawal.
     * @dev For total supply of Safe tokens (1 billion), {uint96} is enough: `10 ** 27 < 2 ** 96`.
     *      {uint64} is valid for billions of years.
     */
    struct UnlockInfo {
        uint96 amount;
        uint64 maturesAt;
    }

    /**
     * @notice Emitted when tokens are locked.
     * @param holder The address of the user who locked the tokens.
     * @param amount The amount of tokens locked.
     */
    event Locked(address indexed holder, uint96 amount);

    /**
     * @notice Emitted when tokens are unlocked.
     * @param holder The address of the user who unlocked the tokens.
     * @param index The index of the unlock operation.
     * @param amount The amount of tokens unlocked.
     */
    event Unlocked(address indexed holder, uint32 indexed index, uint96 amount);

    /**
     * @notice Emitted when tokens are withdrawn.
     * @param holder The address of the user who withdrew the tokens.
     * @param index The index of the unlock operation which was withdrawn.
     * @param amount The amount of withdrawn tokens.
     */
    event Withdrawn(address indexed holder, uint32 indexed index, uint96 amount);

    /**
     * @notice Error indicating an attempt to lock or unlock with an amount of zero.
     */
    error InvalidTokenAmount();

    /**
     * @notice Error indicating an attempt to unlock an amount greater than the holder's currently locked tokens.
     */
    error UnlockAmountExceeded();

    /* solhint-disable func-name-mixedcase */

    /**
     * @notice Gets the configured Safe token for locking contract.
     * @return safeToken The address of the Safe token.
     * @dev The Safe token address is immutable and does not change.
     */
    function SAFE_TOKEN() external view returns (address safeToken);

    /**
     * @notice Gets the configured cooldown period for locking contract.
     * @return cooldownPeriod The cooldown period in seconds.
     * @dev The cooldown period is immutable and does not change.
     */
    function COOLDOWN_PERIOD() external view returns (uint64 cooldownPeriod);

    /* solhint-enable func-name-mixedcase */

    /**
     * @notice Locks the specified amount of tokens.
     * @param amount The amount of tokens to lock. The function will revert with {InvalidTokenAmount} in case `amount` is zero.
     */
    function lock(uint96 amount) external;

    /**
     * @notice Unlocks the specified amount of tokens.
     * @param amount The amount of tokens to lock. The function will revert with custom error {InvalidTokenAmount} in case `amount` is zero.
     *               The function will revert with custom error {UnlockAmountExceeded} in case `amount` is greater than the locked amount.
     * @return index The index of the unlock operation.
     */
    function unlock(uint96 amount) external returns (uint32 index);

    /**
     * @notice Withdraws the unlocked tokens of `maxUnlocks` oldest operations initiated by the caller.
     * @param maxUnlocks The maximum number of unlock operations to be withdrawn, or zero to process all unlocks.
     *                   Will not revert if `maxUnlocks` is greater than the number of matured unlocks, and will only withdraw the matured unlocks.
     * @return amount The amount of tokens withdrawn.
     */
    function withdraw(uint32 maxUnlocks) external returns (uint96 amount);

    /**
     * @notice Returns the amount of Safe tokens associated to the specified holder.
     * @param holder The address of the holder.
     * @return amount The amount of (locked + to be unlocked + withdrawable) Safe tokens of the holder.
     */
    function getUserTokenBalance(address holder) external view returns (uint96 amount);

    /**
     * @notice Returns user information for the specified address.
     * @param holder Address of the user.
     * @return user {User} struct containing information for the specified address.
     */
    function getUser(address holder) external view returns (User memory user);

    /**
     * @notice Returns unlock information for the specified user and index.
     * @param holder Address of the user.
     * @param index The index of the unlock.
     * @return unlockInfo {UnlockInfo} struct containing information about the unlock.
     */
    function getUnlock(address holder, uint32 index) external view returns (UnlockInfo memory unlockInfo);
}

{
  "evmVersion": "paris",
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 10000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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ISafeTokenLock.UnlockInfo","name":"unlockInfo","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"holder","type":"address"}],"name":"getUser","outputs":[{"components":[{"internalType":"uint96","name":"locked","type":"uint96"},{"internalType":"uint96","name":"unlocked","type":"uint96"},{"internalType":"uint32","name":"unlockStart","type":"uint32"},{"internalType":"uint32","name":"unlockEnd","type":"uint32"}],"internalType":"struct ISafeTokenLock.User","name":"user","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"holder","type":"address"}],"name":"getUserTokenBalance","outputs":[{"internalType":"uint96","name":"amount","type":"uint96"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint96","name":"amount","type":"uint96"}],"name":"lock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"beneficiary","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint96","name":"amount","type":"uint96"}],"name":"unlock","outputs":[{"internalType":"uint32","name":"index","type":"uint32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"maxUnlocks","type":"uint32"}],"name":"withdraw","outputs":[{"internalType":"uint96","name":"amount","type":"uint96"}],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000008cf60b289f8d31f737049b590b5e4285ff0bd1d10000000000000000000000005afe3855358e112b5647b952709e6165e1c1eeee0000000000000000000000000000000000000000000000000000000000015180

-----Decoded View---------------
Arg [0] : initialOwner (address): 0x8CF60B289f8d31F737049B590b5E4285Ff0Bd1D1
Arg [1] : safeToken (address): 0x5aFE3855358E112B5647B952709E6165e1c1eEEe
Arg [2] : cooldownPeriod (uint32): 86400

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000008cf60b289f8d31f737049b590b5e4285ff0bd1d1
Arg [1] : 0000000000000000000000005afe3855358e112b5647b952709e6165e1c1eeee
Arg [2] : 0000000000000000000000000000000000000000000000000000000000015180