You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config.rs
    path of file: ./repos/bee/bee-node/bee-plugin/bee-plugin-dashboard/src
    
    the code of the file until where you have to start completion: // Copyright 2020-2022 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

use std::net::{IpAddr, SocketAddr, ToSocketAddrs};

use multiaddr::{Multiaddr, Protocol};
use serde::Deserialize;

const DEFAULT_SESSION_TIMEOUT: u64 = 86400;
const DEFAULT_USER: &str = "admin";
const DEFAULT_PASSWORD_SALT: &str = "0000000000000000000000000000000000000000000000000000000000000000";
const DEFAULT_PASSWORD_HASH: &str = "0000000000000000000000000000000000000000000000000000000000000000";
const DEFAULT_BIND_ADDRESS: &str = "/ip4/0.0.0.0/tcp/8081";

/// Builder struct for creating a [`DashboardAuthConfig`].
#[derive(Default, Deserialize, Eq, PartialEq)]
pub struct DashboardAuthConfigBuilder {
    #[serde(alias = "session
    
    pub fn finish(self) -> DashboardConfig {
        let multi_addr = self
            .bind_address
            // We made sure that the default value is valid and therefore parseable.
            .unwrap_or_else(|| DEFAULT_BIND_ADDRESS.parse().unwrap());
        let address = multi_addr
            .iter()
            .find_map(|x| match x {
                Protocol::Dns(address) => Some(
                    (address.to_string(), 0)
                        .to_socket_addrs()
                        .unwrap_or_else(|error| panic!("error resolving '{}':{}", address, error))
                        .next()
                        // Unwrapping here is fine, because to_socket-addrs() didn't return an error,
                        // thus we can be sure that the iterator contains at least 1 element.
                        .unwrap()
                        .ip(),
                ),
                Protocol::Ip4(ip) => Some(IpAddr::V4(ip)),
                Protocol::Ip6(ip) => Some(IpAddr::V6(ip)),
                _ => None,
            })
            .expect("Unsupported address");

        let port = multi_addr
            .iter()
            .find_map(|x| if let Protocol::Tcp(port) = x { Some(port) } else { None })
            .expect("Unsupported protocol");

        DashboardConfig {
            bind_socket_addr: SocketAddr::new(address, port),
            auth: self.auth.unwrap_or_default().finish(),
        }
    }