Test-Multiplayer/Assets/Scripts/Chat/ChatAuthenticator.cs

using Mirror;
using Mirror.Examples.Chat;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ChatAuthenticator : NetworkAuthenticator
{
    readonly HashSet<NetworkConnectionToClient> connectionsPendingDisconnect = new HashSet<NetworkConnectionToClient>();
    internal static readonly HashSet<string> playerNames = new HashSet<string>();

    [Header("Client Username")]
    public string playerName;

    #region Messages;

    public struct AuthRequestMessage : NetworkMessage
    {
        public string authUsername;
    }

    public struct AuthResponseMessage : NetworkMessage
    {
        public byte code;
        public string message;
    }

    #endregion

    #region Server

    [UnityEngine.RuntimeInitializeOnLoadMethod]
    static void ResetStatics()
    {
        playerNames.Clear();
    }

    public override void OnStartServer()
    {
        NetworkServer.RegisterHandler<AuthRequestMessage>(OnAuthRequestMessage, false);
    }

    public override void OnStopServer()
    {
        NetworkServer.UnregisterHandler<AuthRequestMessage>();
    }

    public override void OnServerAuthenticate(NetworkConnectionToClient conn)
    {
        
    }

    public void OnAuthRequestMessage(NetworkConnectionToClient conn, AuthRequestMessage msg)
    {
        Debug.Log($"Authentication Request Username: {msg.authUsername}");

        if (connectionsPendingDisconnect.Contains(conn)) return;

        if (!playerNames.Contains(msg.authUsername))
        {
            playerNames.Add(msg.authUsername);

            conn.authenticationData = msg.authUsername;

            AuthResponseMessage authResponseMessage = new AuthResponseMessage
            {
                code = 100,
                message = "Success"
            };

            conn.Send(authResponseMessage);

            ServerAccept(conn);
        }
        else
        {
            connectionsPendingDisconnect.Add(conn);

            AuthResponseMessage authResponseMessage = new AuthResponseMessage
            {
                code = 200,
                message = "Username already in use... try again"
            };

            conn.Send(authResponseMessage);

            conn.isAuthenticated = false;

            StartCoroutine(DelayedDisconnect(conn, 1f));
        }
    }

    IEnumerator DelayedDisconnect(NetworkConnectionToClient conn, float waitTime)
    {
        yield return new WaitForSeconds(waitTime);

        ServerReject(conn);

        yield return null;

        connectionsPendingDisconnect.Remove(conn);
    }

    #endregion

    #region Client

    public void SetPlayerName(string username)
    {
        playerName = username;
        if (LoginUI.instance != null && LoginUI.instance.errorText != null)
        {
            LoginUI.instance.errorText.text = string.Empty;
            LoginUI.instance.errorText.gameObject.SetActive(false);
        }
    }

    public override void OnStartClient()
    {
        NetworkClient.RegisterHandler<AuthResponseMessage>(OnAuthResponseMessage, false);
    }

    public override void OnStopClient()
    {
        NetworkClient.UnregisterHandler<AuthResponseMessage>();
    }

    public override void OnClientAuthenticate()
    {
        NetworkClient.Send(new AuthRequestMessage { authUsername = playerName });
    }

    public void OnAuthResponseMessage(AuthResponseMessage msg)
    {
        if (msg.code == 100)
        {
            Debug.Log($"Authentication Response: {msg.code} {msg.message}");

            ClientAccept();
        }
        else
        {
            Debug.LogError($"Authentication Response: {msg.code} {msg.message}");

            NetworkManager.singleton.StopHost();

            LoginUI.instance.errorText.text = msg.message;
            LoginUI.instance.errorText.gameObject.SetActive(true);
        }
    }

    #endregion

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}