sharp-chat/SharpChat/PacketHandlers/SendMessageHandler.cs

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using SharpChat.Commands;
using SharpChat.Config;
using SharpChat.Events;
using SharpChat.EventStorage;
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using SharpChat.Packet;
using System;
using System.Collections.Generic;
using System.Linq;
namespace SharpChat.PacketHandlers
{
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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);
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ChatUser user = ctx.Connection.User;
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// 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);
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int maxMsgLength = MaxMessageLength;
if(messageText.Length > maxMsgLength)
messageText = messageText[..maxMsgLength];
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messageText = messageText.Trim();
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#if DEBUG
Logger.Write($"<{ctx.Connection.Id} {user.UserName}> {messageText}");
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#endif
if(messageText.StartsWith("/")) {
ChatCommandContext context = new(messageText, ctx.Chat, user, ctx.Connection, channel);
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IChatCommand command = null;
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foreach(IChatCommand cmd in Commands)
if(cmd.IsMatch(context)) {
command = cmd;
break;
}
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if(command != null) {
command.Dispatch(context);
return;
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}
}
ctx.Chat.DispatchEvent(new MessageCreateEvent(
SharpId.Next(),
channel,
user,
DateTimeOffset.Now,
messageText,
false, false, false
));
} finally {
ctx.Chat.ContextAccess.Release();
}
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}
}
}