mcdiscordbot/MinecraftDiscordBot/Program.cs

325 lines
15 KiB
C#
Raw Normal View History

using CommandLine;
2022-01-10 16:10:32 +01:00
using Discord;
using Discord.Commands;
2022-01-10 16:10:32 +01:00
using Discord.Rest;
using Discord.WebSocket;
using Fleck;
using MinecraftDiscordBot.Commands;
using MinecraftDiscordBot.Services;
2022-01-10 16:10:32 +01:00
using System.Collections.Concurrent;
using System.Reflection;
using System.Runtime.CompilerServices;
2022-01-10 11:33:18 +01:00
2022-01-10 16:10:32 +01:00
namespace MinecraftDiscordBot;
2022-01-10 11:33:18 +01:00
public class Program : IDisposable, ICommandHandler<ResponseType> {
public const string WebSocketSource = "WebSocket";
public const string BotSource = "Bot";
private static readonly object LogLock = new();
public const int ChoiceTimeout = 20 * 1000;
2022-01-10 16:10:32 +01:00
private readonly DiscordSocketClient _client = new(new() {
LogLevel = LogSeverity.Verbose,
GatewayIntents = GatewayIntents.AllUnprivileged & ~(GatewayIntents.GuildScheduledEvents | GatewayIntents.GuildInvites)
2022-01-10 16:10:32 +01:00
});
private readonly WebSocketServer _wssv;
private readonly BotConfiguration _config;
private readonly HashSet<ulong> _whitelistedChannels;
private readonly ConcurrentDictionary<Guid, RootCommandService> _connections = new();
private static readonly char[] WhiteSpace = new char[] { '\t', '\n', ' ', '\r' };
public ITextChannel[] _channels = Array.Empty<ITextChannel>();
private RootCommandService? _rsSystem = null;
private bool disposedValue;
public static bool OnlineNotifications => false;
private const string ClientScriptName = "MinecraftDiscordBot.ClientScript.lua";
public readonly string ClientScript;
private readonly ITokenProvider _tokenProvider = new TimeoutTokenProvider(InstanceId, 10);
private static readonly int InstanceId = new Random().Next();
private string GetVerifiedClientScript() => ClientScript
.Replace("$TOKEN", _tokenProvider.GenerateToken());
private string GetClientScript(BotConfiguration config) {
using var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(ClientScriptName);
if (stream is null) throw new FileNotFoundException("Client script could not be loaded!");
using var sr = new StreamReader(stream);
return sr.ReadToEnd()
.Replace("$HOST", $"ws://{config.SocketHost}:{config.Port}");
}
public RootCommandService? Computer {
get => _rsSystem; set {
if (_rsSystem != value) {
_rsSystem = value;
if (OnlineNotifications)
_ = Task.Run(() => Broadcast(i => i.SendMessageAsync(value is null
? $"The Refined Storage went offline. Please check the server!"
: $"The Refined Storage is back online!")));
}
}
}
2022-01-10 16:10:32 +01:00
private async Task Broadcast(Func<ITextChannel, Task<IUserMessage>> message) => _ = await Task.WhenAll(_channels.Select(message));
2022-01-10 16:10:32 +01:00
public Program(BotConfiguration config) {
_config = config;
ClientScript = GetClientScript(config);
_client.Log += LogAsync;
_client.MessageReceived += (msg) => DiscordMessageReceived(msg);
_client.ReactionAdded += DiscordReactionAdded;
2022-01-10 16:10:32 +01:00
_wssv = new WebSocketServer($"ws://0.0.0.0:{config.Port}") {
RestartAfterListenError = true
};
FleckLog.LogAction = LogWebSocket;
2022-01-10 16:10:32 +01:00
_whitelistedChannels = config.Channels.ToHashSet();
}
private void LogWebSocket(LogLevel level, string message, Exception exception) => Log(new(level switch {
LogLevel.Debug => LogSeverity.Debug,
LogLevel.Info => LogSeverity.Info,
LogLevel.Warn => LogSeverity.Warning,
LogLevel.Error => LogSeverity.Error,
_ => LogSeverity.Critical // Unknown logging states should behave critical
}, WebSocketSource, message, exception));
2022-01-10 16:10:32 +01:00
public static Task<int> Main(string[] args)
=> Parser.Default.ParseArguments<BotConfiguration, ConfigFile>(args)
.MapResult<BotConfiguration, ConfigFile, Task<int>>(
RunWithConfig,
RunWithConfig,
errs => Task.FromResult(1));
private static Task<int> RunWithConfig(IBotConfigurator arg) => new Program(arg.Config).RunAsync();
2022-01-10 16:10:32 +01:00
public async Task<int> RunAsync() {
StartWebSocketServer();
2022-01-10 16:10:32 +01:00
await _client.LoginAsync(TokenType.Bot, _config.Token);
await _client.StartAsync();
if (!await HasValidChannels())
return 1;
2022-01-10 16:10:32 +01:00
// Block this task until the program is closed.
await Task.Delay(-1);
return 0;
}
private async Task<bool> HasValidChannels() {
if (await GetValidChannels(_whitelistedChannels).ToArrayAsync() is not { Length: > 0 } channels) {
2022-01-12 19:03:51 +01:00
await LogErrorAsync(BotSource, new InvalidOperationException("No valid textchannel was whitelisted!"));
return false;
}
_channels = channels;
return true;
}
private void StartWebSocketServer() => _wssv.Start(socket => {
socket.OnOpen = async () => await SocketOpened(socket);
socket.OnClose = async () => await SocketClosed(socket);
socket.OnMessage = async message => await SocketReceived(socket, message);
});
private async IAsyncEnumerable<ITextChannel> GetValidChannels(IEnumerable<ulong> ids) {
foreach (var channelId in ids) {
var channel = await _client.GetChannelAsync(channelId);
if (channel is not ITextChannel textChannel) {
2022-01-12 19:03:51 +01:00
if (channel is null) await LogWarningAsync(BotSource, $"Channel with id [{channelId}] does not exist!");
else await LogWarningAsync(BotSource, $"Channel is not a text channels and will not be used: {channel.Name} [{channel.Id}]!");
continue;
}
if (textChannel.Guild is RestGuild guild) {
await guild.UpdateAsync();
2022-01-12 19:03:51 +01:00
await LogInfoAsync(BotSource, $"Whitelisted in channel: {channel.Name} [{channel.Id}] on server {guild.Name} [{guild.Id}]");
} else {
2022-01-12 19:03:51 +01:00
await LogWarningAsync(BotSource, $"Whitelisted in channel: {channel.Name} [{channel.Id}] on unknown server!");
}
yield return textChannel;
2022-01-10 16:10:32 +01:00
}
}
private async Task SocketReceived(IWebSocketConnection socket, string message) {
await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Received: {message}");
await (message switch {
"getcode" => SendClientCode(socket),
string s when s.StartsWith("login=") => ClientComputerConnected(socket, s[6..]),
_ => DisruptClientConnection(socket, "Protocol violation!")
});
}
private async Task ClientComputerConnected(IWebSocketConnection socket, string token) {
if (!_tokenProvider.VerifyToken(token)) {
await DisruptClientConnection(socket, "outdated");
return;
}
await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client logged in with valid script!");
AddComputerSocket(socket, new(socket));
}
private static async Task DisruptClientConnection(IWebSocketConnection socket, string reason) {
await socket.Send(reason);
await LogWarningAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client will be terminated, reason: {reason}");
socket.Close();
}
private async Task SendClientCode(IWebSocketConnection socket) {
await socket.Send(GetVerifiedClientScript());
await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Script sent to client!");
}
private void AddComputerSocket(IWebSocketConnection socket, RootCommandService pc) => Computer = pc;
private void RemoveComputerSocket(IWebSocketConnection socket) {
if (Computer is { ConnectionInfo.Id: Guid id } && id == socket.ConnectionInfo.Id) Computer = null;
2022-01-10 16:10:32 +01:00
}
private async Task SocketClosed(IWebSocketConnection socket) {
RemoveComputerSocket(socket);
2022-01-12 19:03:51 +01:00
await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client disconnected!");
2022-01-10 16:10:32 +01:00
}
private static async Task SocketOpened(IWebSocketConnection socket) => await LogInfoAsync(WebSocketSource, $"[{socket.ConnectionInfo.Id}] Client connected from {socket.ConnectionInfo.ClientIpAddress}:{socket.ConnectionInfo.ClientPort}!");
private async Task DiscordMessageReceived(SocketMessage arg, int timeout = 10000) {
if (arg is not SocketUserMessage message) return;
if (message.Author.IsBot) return;
if (!IsChannelWhitelisted(arg.Channel)) return;
var cts = new CancellationTokenSource(timeout);
if (IsCommand(message, out var argPos)) {
var parameters = message.Content[argPos..].Split(WhiteSpace, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
_ = Task.Run(async () => {
var response = await HandleCommand(message, parameters, cts.Token);
await SendResponse(message, response);
});
return;
}
2022-01-12 19:03:51 +01:00
await LogInfoAsync("Discord", $"[{arg.Author.Username}] {arg.Content}");
// TODO: Relay Message to Chat Receiver
2022-01-10 16:10:32 +01:00
}
private Task SendResponse(SocketUserMessage message, ResponseType response) => response switch {
ResponseType.IChoiceResponse res => HandleChoice(message, res),
ResponseType.StringResponse res => message.ReplyAsync(res.Message),
_ => message.ReplyAsync($"Whoops, someone forgot to implement '{response.GetType()}' responses?"),
};
private readonly ConcurrentDictionary<ulong, ResponseType.IChoiceResponse> _choiceWait = new();
private async Task DiscordReactionAdded(Cacheable<IUserMessage, ulong> message, Cacheable<IMessageChannel, ulong> channel, SocketReaction reaction) {
var msgObject = await message.GetOrDownloadAsync();
if (reaction.UserId == _client.CurrentUser.Id) return;
if (!_choiceWait.TryRemove(message.Id, out var choice)) { await LogInfoAsync(BotSource, "Reaction was added to message without choice object!"); return; }
await msgObject.DeleteAsync();
await LogInfoAsync(BotSource, $"Reaction {reaction.Emote.Name} was added to the choice by {reaction.UserId}!");
}
private async Task HandleChoice(SocketUserMessage message, ResponseType.IChoiceResponse res) {
var reply = await message.ReplyAsync($"{res.Query}\n{string.Join("\n", res.Options)}");
_choiceWait[reply.Id] = res;
var reactions = new Emoji[] { new("0⃣")/*, new("1⃣"), new("2⃣"), new("3⃣"), new("4⃣"), new("5⃣"), new("6⃣"), new("7⃣"), new("8⃣"), new("9⃣")*/ };
await reply.AddReactionsAsync(reactions);
_ = Task.Run(async () => {
await Task.Delay(ChoiceTimeout);
_ = _choiceWait.TryRemove(message.Id, out _);
await reply.ModifyAsync(i => i.Content = "You did not choose in time!");
await reply.RemoveAllReactionsAsync();
});
}
public async Task<ResponseType> HandleCommand(SocketUserMessage message, string[] parameters, CancellationToken ct) {
if (Computer is ICommandHandler<ResponseType> handler)
try {
return await handler.HandleCommand(message, parameters, ct);
} catch (TaskCanceledException) {
return ResponseType.AsString("Your request could not be processed in time!");
} catch (ReplyException e) {
2022-01-16 22:15:11 +01:00
await LogInfoAsync(BotSource, e.Message);
return ResponseType.AsString(e.Message);
} catch (Exception e) {
await LogErrorAsync(BotSource, e);
return ResponseType.AsString($"Oopsie doopsie, this should not have happened!");
}
else return ResponseType.AsString("The Minecraft server is currently unavailable!");
}
private bool IsCommand(SocketUserMessage message, out int argPos) {
argPos = 0;
return message.HasStringPrefix(_config.Prefix, ref argPos);
}
2022-01-10 16:10:32 +01:00
private bool IsChannelWhitelisted(ISocketMessageChannel channel)
=> _whitelistedChannels.Contains(channel.Id);
2022-01-12 19:03:51 +01:00
public static ConfiguredTaskAwaitable LogInfoAsync(string source, string message) => LogAsync(new(LogSeverity.Info, source, message)).ConfigureAwait(false);
public static ConfiguredTaskAwaitable LogWarningAsync(string source, string message) => LogAsync(new(LogSeverity.Warning, source, message)).ConfigureAwait(false);
public static ConfiguredTaskAwaitable LogErrorAsync(string source, Exception exception) => LogAsync(new(LogSeverity.Error, source, exception?.Message, exception)).ConfigureAwait(false);
public static void LogInfo(string source, string message) => Log(new(LogSeverity.Info, source, message));
public static void LogWarning(string source, string message) => Log(new(LogSeverity.Warning, source, message));
public static void LogError(string source, Exception exception) => Log(new(LogSeverity.Error, source, exception?.Message, exception));
private static async Task LogAsync(LogMessage msg) {
Log(msg);
await Task.CompletedTask;
}
2022-01-12 19:03:51 +01:00
public static void Log(LogMessage msg) {
lock (LogLock)
Console.WriteLine(msg.ToString());
}
protected virtual void Dispose(bool disposing) {
if (!disposedValue) {
if (disposing) {
// TODO: dispose managed state (managed objects)
_wssv.Dispose();
_client.Dispose();
2022-01-10 16:10:32 +01:00
}
// TODO: free unmanaged resources (unmanaged objects) and override finalizer
// TODO: set large fields to null
disposedValue = true;
2022-01-10 16:10:32 +01:00
}
}
// // TODO: override finalizer only if 'Dispose(bool disposing)' has code to free unmanaged resources
// ~Program()
// {
// // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
// Dispose(disposing: false);
// }
public void Dispose() {
// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
Dispose(disposing: true);
GC.SuppressFinalize(this);
2022-01-10 16:10:32 +01:00
}
}
public abstract class ResponseType {
private static string DefaultDisplay<T>(T obj) => obj?.ToString() ?? throw new InvalidProgramException("ToString did not yield anything!");
public static ResponseType AsString(string message) => new StringResponse(message);
public static ResponseType FromChoice<T>(string query, IEnumerable<T> choice, Func<T, Task> resultHandler, Func<T, string>? display = null) => new ChoiceResponse<T>(query, choice, resultHandler, display ?? DefaultDisplay);
public class StringResponse : ResponseType {
public StringResponse(string message) => Message = message;
public string Message { get; }
}
public interface IChoiceResponse {
IEnumerable<string> Options { get; }
string Query { get; }
Task HandleResult(int index);
}
public class ChoiceResponse<T> : ResponseType, IChoiceResponse {
private readonly Func<T, Task> _resultHandler;
private readonly T[] _options;
private readonly Func<T, string> _displayer;
public IEnumerable<string> Options => _options.Select(_displayer);
public string Query { get; }
public Task HandleResult(int index) => _resultHandler(_options[index]);
public ChoiceResponse(string query, IEnumerable<T> choice, Func<T, Task> resultHandler, Func<T, string> display) {
Query = query;
_resultHandler = resultHandler;
_options = choice.ToArray();
_displayer = display;
}
}
}