sharp-chat/SharpChat/SockChatServer.cs

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C#
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using Fleck;
using SharpChat.Commands;
using SharpChat.Config;
using SharpChat.EventStorage;
using SharpChat.Misuzu;
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using SharpChat.Packet;
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using SharpChat.PacketHandlers;
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading;
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namespace SharpChat {
public class SockChatServer : IDisposable {
public const ushort DEFAULT_PORT = 6770;
public const int DEFAULT_MSG_LENGTH_MAX = 5000;
public const int DEFAULT_MAX_CONNECTIONS = 5;
public const int DEFAULT_FLOOD_KICK_LENGTH = 30;
public const int DEFAULT_FLOOD_KICK_EXEMPT_RANK = 9;
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public IWebSocketServer Server { get; }
public ChatContext Context { get; }
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private readonly HttpClient HttpClient;
private readonly MisuzuClient Misuzu;
private readonly CachedValue<int> MaxMessageLength;
private readonly CachedValue<int> MaxConnections;
private readonly CachedValue<int> FloodKickLength;
private readonly CachedValue<int> FloodKickExemptRank;
private readonly List<IPacketHandler> GuestHandlers = new();
private readonly List<IPacketHandler> AuthedHandlers = new();
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private readonly SendMessageHandler SendMessageHandler;
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private bool IsShuttingDown = false;
public SockChatServer(HttpClient httpClient, MisuzuClient msz, IEventStorage evtStore, IConfig config) {
Logger.Write("Initialising Sock Chat server...");
DateTimeOffset started = DateTimeOffset.UtcNow;
HttpClient = httpClient;
Misuzu = msz;
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MaxMessageLength = config.ReadCached("msgMaxLength", DEFAULT_MSG_LENGTH_MAX);
MaxConnections = config.ReadCached("connMaxCount", DEFAULT_MAX_CONNECTIONS);
FloodKickLength = config.ReadCached("floodKickLength", DEFAULT_FLOOD_KICK_LENGTH);
FloodKickExemptRank = config.ReadCached("floodKickExemptRank", DEFAULT_FLOOD_KICK_EXEMPT_RANK);
Context = new ChatContext(evtStore);
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string[]? channelNames = config.ReadValue("channels", new[] { "lounge" });
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if(channelNames != null)
foreach(string channelName in channelNames) {
IConfig channelCfg = config.ScopeTo($"channels:{channelName}");
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string? name = channelCfg.SafeReadValue("name", string.Empty);
if(string.IsNullOrWhiteSpace(name))
name = channelName;
ChannelInfo channelInfo = new(
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name,
channelCfg.SafeReadValue("password", string.Empty),
rank: channelCfg.SafeReadValue("minRank", 0)
);
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Context.Channels.Add(channelInfo);
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}
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if(Context.Channels.PublicCount < 1)
Context.Channels.Add(new ChannelInfo("Default"));
GuestHandlers.Add(new AuthHandler(
started,
Misuzu,
Context.Channels.MainChannel,
MaxMessageLength,
MaxConnections
));
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AuthedHandlers.AddRange(new IPacketHandler[] {
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new PingHandler(Misuzu),
SendMessageHandler = new SendMessageHandler(MaxMessageLength),
});
SendMessageHandler.AddCommands(new IUserCommand[] {
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new UserAFKCommand(),
new UserNickCommand(),
new MessageWhisperCommand(),
new MessageActionCommand(),
new WhoCommand(),
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new ChannelJoinCommand(),
new ChannelCreateCommand(),
new ChannelDeleteCommand(),
new ChannelPasswordCommand(),
new ChannelRankCommand(),
new MessageBroadcastCommand(),
new MessageDeleteCommand(),
new KickBanCommand(msz),
new PardonUserCommand(msz),
new PardonAddressCommand(msz),
new BanListCommand(msz),
new WhoisCommand(),
});
ushort port = config.SafeReadValue("port", DEFAULT_PORT);
Server = new SharpChatWebSocketServer($"ws://0.0.0.0:{port}");
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}
public void Listen(ManualResetEvent waitHandle) {
if(waitHandle != null)
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SendMessageHandler.AddCommand(new ShutdownRestartCommand(waitHandle, () => !IsShuttingDown && (IsShuttingDown = true)));
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Server.Start(sock => {
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if(IsShuttingDown) {
sock.Close(1013);
return;
}
ConnectionInfo conn = new(sock);
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Context.Connections.Add(conn);
sock.OnOpen = () => OnOpen(conn);
sock.OnClose = () => OnClose(conn);
sock.OnError = err => OnError(conn, err);
sock.OnMessage = msg => OnMessage(conn, msg);
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});
Logger.Write("Listening...");
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}
private void OnOpen(ConnectionInfo conn) {
Logger.Write($"Connection opened from {conn.RemoteAddress}:{conn.RemotePort}");
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Context.SafeUpdate();
}
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private void OnError(ConnectionInfo conn, Exception ex) {
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Logger.Write($"[{conn.Id} {conn.RemoteAddress}] {ex}");
Context.SafeUpdate();
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}
private void OnClose(ConnectionInfo conn) {
Logger.Write($"Connection closed from {conn.RemoteAddress}:{conn.RemotePort}");
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Context.ContextAccess.Wait();
try {
Context.Connections.Remove(conn);
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if(conn.User != null && !Context.Connections.Any(c => c.User == conn.User))
Context.HandleDisconnect(conn.User);
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Context.Update();
} finally {
Context.ContextAccess.Release();
}
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}
private void OnMessage(ConnectionInfo conn, string msg) {
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Context.SafeUpdate();
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// this doesn't affect non-authed connections?????
if(conn.User is not null && conn.User.Rank < FloodKickExemptRank) {
UserInfo? banUser = null;
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string banAddr = string.Empty;
TimeSpan banDuration = TimeSpan.MinValue;
Context.ContextAccess.Wait();
try {
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if(!Context.UserRateLimiters.TryGetValue(conn.User.UserId, out RateLimiter? rateLimiter))
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Context.UserRateLimiters.Add(conn.User.UserId, rateLimiter = new RateLimiter(
UserInfo.DEFAULT_SIZE,
UserInfo.DEFAULT_MINIMUM_DELAY,
UserInfo.DEFAULT_RISKY_OFFSET
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));
rateLimiter.Update();
if(rateLimiter.IsExceeded) {
banDuration = TimeSpan.FromSeconds(FloodKickLength);
banUser = conn.User;
banAddr = conn.RemoteAddress.ToString();
} else if(rateLimiter.IsRisky) {
banUser = conn.User;
}
if(banUser is not null) {
if(banDuration == TimeSpan.MinValue) {
Context.SendTo(conn.User, new FloodWarningPacket());
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} else {
Context.BanUser(conn.User, banDuration, UserDisconnectReason.Flood);
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if(banDuration > TimeSpan.Zero)
Misuzu.CreateBanAsync(
conn.User.UserId.ToString(), conn.RemoteAddress.ToString(),
string.Empty, "::1",
banDuration,
"Kicked from chat for flood protection."
).Wait();
return;
}
}
} finally {
Context.ContextAccess.Release();
}
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}
PacketHandlerContext context = new(msg, Context, conn);
IPacketHandler? handler = conn.User is null
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? GuestHandlers.FirstOrDefault(h => h.IsMatch(context))
: AuthedHandlers.FirstOrDefault(h => h.IsMatch(context));
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handler?.Handle(context);
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}
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private bool IsDisposed;
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~SockChatServer() {
DoDispose();
}
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public void Dispose() {
DoDispose();
GC.SuppressFinalize(this);
}
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private void DoDispose() {
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if(IsDisposed)
return;
IsDisposed = true;
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IsShuttingDown = true;
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foreach(ConnectionInfo conn in Context.Connections)
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conn.Dispose();
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Server?.Dispose();
HttpClient?.Dispose();
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}
}
}