89 lines
3.2 KiB
C#
89 lines
3.2 KiB
C#
using SharpChat.Configuration;
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using SharpChat.Events;
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using SharpChat.Snowflake;
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using System.Globalization;
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using System.Text;
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namespace SharpChat.C2SPacketHandlers;
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public class SendMessageC2SPacketHandler(
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RandomSnowflake randomSnowflake,
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CachedValue<int> maxMsgLength
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) : C2SPacketHandler {
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private readonly CachedValue<int> MaxMessageLength = maxMsgLength ?? throw new ArgumentNullException(nameof(maxMsgLength));
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private List<ClientCommand> Commands { get; } = [];
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public void AddCommand(ClientCommand command) {
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Commands.Add(command ?? throw new ArgumentNullException(nameof(command)));
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}
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public void AddCommands(IEnumerable<ClientCommand> commands) {
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Commands.AddRange(commands ?? throw new ArgumentNullException(nameof(commands)));
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}
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public bool IsMatch(C2SPacketHandlerContext ctx) {
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return ctx.CheckPacketId("2");
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}
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public async Task Handle(C2SPacketHandlerContext ctx) {
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string[] args = ctx.SplitText(3);
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User? user = ctx.Connection.User;
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string? messageText = args.ElementAtOrDefault(2);
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if(user == null || !user.Can(UserPermissions.SendMessage) || string.IsNullOrWhiteSpace(messageText))
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return;
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// Extra validation step, not necessary at all but enforces proper formatting in SCv1.
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if(!long.TryParse(args[1], out long mUserId) || user.UserId != mUserId.ToString())
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return;
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ctx.Chat.ContextAccess.Wait();
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try {
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if(!ctx.Chat.UserLastChannel.TryGetValue(user.UserId, out Channel? channel)
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&& (channel is null || !ctx.Chat.IsInChannel(user, channel)))
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return;
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if(user.Status != UserStatus.Online)
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await ctx.Chat.UpdateUser(user, status: UserStatus.Online);
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int maxMsgLength = MaxMessageLength;
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StringInfo messageTextInfo = new(messageText);
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if(Encoding.UTF8.GetByteCount(messageText) > (maxMsgLength * 10)
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|| messageTextInfo.LengthInTextElements > maxMsgLength)
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messageText = messageTextInfo.SubstringByTextElements(0, Math.Min(messageTextInfo.LengthInTextElements, maxMsgLength));
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messageText = messageText.Trim();
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#if DEBUG
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Logger.Write($"<{ctx.Connection.Id} {user.UserName}> {messageText}");
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#endif
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if(messageText.StartsWith('/')) {
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ClientCommandContext context = new(messageText, ctx.Chat, user, ctx.Connection, channel);
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foreach(ClientCommand cmd in Commands)
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if(cmd.IsMatch(context)) {
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await cmd.Dispatch(context);
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return;
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}
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}
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await ctx.Chat.DispatchEvent(new MessageCreateEvent(
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randomSnowflake.Next(),
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channel.Name,
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user.UserId,
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user.UserName,
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user.Colour,
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user.Rank,
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user.NickName,
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user.Permissions,
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DateTimeOffset.Now,
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messageText,
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false, false, false
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));
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} finally {
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ctx.Chat.ContextAccess.Release();
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}
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}
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}
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