sharp-chat/SharpChat/PacketHandlers/SendMessageHandler.cs

104 lines
3.7 KiB
C#

using SharpChat.Commands;
using SharpChat.Config;
using SharpChat.Events;
using SharpChat.Packet;
using System;
using System.Collections.Generic;
using System.Linq;
namespace SharpChat.PacketHandlers {
public class SendMessageHandler : IChatPacketHandler {
private readonly CachedValue<int> MaxMessageLength;
private List<IChatCommand> Commands { get; } = new();
public SendMessageHandler(CachedValue<int> maxMsgLength) {
MaxMessageLength = maxMsgLength ?? throw new ArgumentNullException(nameof(maxMsgLength));
}
public void AddCommand(IChatCommand command) {
Commands.Add(command ?? throw new ArgumentNullException(nameof(command)));
}
public void AddCommands(IEnumerable<IChatCommand> commands) {
Commands.AddRange(commands ?? throw new ArgumentNullException(nameof(commands)));
}
public bool IsMatch(ChatPacketHandlerContext ctx) {
return ctx.CheckPacketId("2");
}
public void Handle(ChatPacketHandlerContext ctx) {
string[] args = ctx.SplitText(3);
ChatUser user = ctx.Connection.User;
// No longer concats everything after index 1 with \t, no previous implementation did that either
string messageText = args.ElementAtOrDefault(2);
if(user == null || !user.Can(ChatUserPermissions.SendMessage) || string.IsNullOrWhiteSpace(messageText))
return;
// Extra validation step, not necessary at all but enforces proper formatting in SCv1.
if(!long.TryParse(args[1], out long mUserId) || user.UserId != mUserId)
return;
ctx.Chat.ContextAccess.Wait();
try {
if(!ctx.Chat.UserLastChannel.TryGetValue(user.UserId, out ChatChannel channel)
&& !ctx.Chat.IsInChannel(user, channel)
/*|| (user.IsSilenced && !user.Can(ChatUserPermissions.SilenceUser))*/)
return;
if(user.Status != ChatUserStatus.Online)
ctx.Chat.UpdateUser(user, status: ChatUserStatus.Online);
int maxMsgLength = MaxMessageLength;
if(messageText.Length > maxMsgLength)
messageText = messageText[..maxMsgLength];
messageText = messageText.Trim();
#if DEBUG
Logger.Write($"<{ctx.Connection.Id} {user.UserName}> {messageText}");
#endif
IChatMessage message = null;
if(messageText.StartsWith("/")) {
ChatCommandContext context = new(messageText, ctx.Chat, user, ctx.Connection, channel);
IChatCommand command = null;
foreach(IChatCommand cmd in Commands)
if(cmd.IsMatch(context)) {
command = cmd;
break;
}
if(command != null) {
if(command is ActionCommand actionCommand)
message = actionCommand.ActionDispatch(context);
else {
command.Dispatch(context);
return;
}
}
}
message ??= new ChatMessage {
ChannelName = channel.Name,
DateTime = DateTimeOffset.UtcNow,
Sender = user,
Text = messageText,
};
ctx.Chat.Events.AddEvent(message);
ctx.Chat.SendTo(channel, new ChatMessageAddPacket(message));
} finally {
ctx.Chat.ContextAccess.Release();
}
}
}
}