L1StandardBridge.sol

/**
 * @title L1StandardBridge
 * @dev The L1 ETH and ERC20 Bridge is a contract which stores deposited L1 funds and standard
 * tokens that are in use on L2. It synchronizes a corresponding L2 Bridge, informing it of deposits
 * and listening to it for newly finalized withdrawals.
 *
 */
contract L1StandardBridge is IL1StandardBridge, CrossDomainEnabled {
    function depositETHTo(
        address _to,
        uint32 _l2Gas,
        bytes calldata _data
    ) external payable {
        _initiateETHDeposit(msg.sender, _to, _l2Gas, _data);
    }

    /**
     * @dev Performs the logic for deposits by storing the ETH and informing the L2 ETH Gateway of
     * the deposit.
     * @param _from Account to pull the deposit from on L1.
     * @param _to Account to give the deposit to on L2.
     * @param _l2Gas Gas limit required to complete the deposit on L2.
     * @param _data Optional data to forward to L2. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function _initiateETHDeposit(
        address _from,
        address _to,
        uint32 _l2Gas,
        bytes memory _data
    ) internal {
        // Construct calldata for finalizeDeposit call
        bytes memory message = abi.encodeWithSelector(
            IL2ERC20Bridge.finalizeDeposit.selector,
            address(0),
            Lib_PredeployAddresses.OVM_ETH,
            _from,
            _to,
            msg.value,
            _data
        );
        // Send calldata into L2
        // slither-disable-next-line reentrancy-events
        sendCrossDomainMessage(l2TokenBridge, _l2Gas, message);
        // slither-disable-next-line reentrancy-events
        emit ETHDepositInitiated(_from, _to, msg.value, _data);
    }
    
    // ... other functions (OMITTED)
}