EthManager

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.3/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// File: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.3/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}

// File: contracts/EthManager.sol


pragma solidity ^0.8.20;

// Import the Ownable contract from OpenZeppelin for secure ownership


/**
 * @title EthManager
 * @dev A simple, secure contract to receive ETH deposits and forward them to an owner.
 * Ownership is manageable via the inherited Ownable functions.
 */
contract EthManager is Ownable {

    // Event for off-chain tracking of deposits
    event ETHDeposited(
        address indexed from,
        address indexed to,
        uint256 amount
    );

    /**
     * @dev Sets the initial owner of the contract. The owner will receive all deposits.
     * @param initialOwner The address of the wallet that will be the contract's owner.
     */
    constructor(address initialOwner) {
        require(initialOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(initialOwner);
    }

    /**
     * @dev The main function for processing ETH deposits. Accepts ETH and forwards it to the owner.
     * This function is payable, allowing it to receive ETH in the transaction.
     */
    function depositETH() external payable {
        // Ensure that some amount of ETH is being sent to prevent wasted gas.
        require(msg.value > 0, "ETH amount must be greater than zero");

        // Forward the received ETH directly to the owner's wallet.
        // .call is the recommended secure way to send Ether.
        (bool success, ) = owner().call{value: msg.value}("");
        require(success, "ETH transfer failed.");

        // Emit an event for your backend to track the deposit.
        emit ETHDeposited(msg.sender, owner(), msg.value);
    }
}