sharp-chat/SharpChat/Commands/WhoCommand.cs

using SharpChat.Packet;
using System.Linq;
using System.Text;

namespace SharpChat.Commands {
    public class WhoCommand : IChatCommand {
        public bool IsMatch(ChatCommandContext ctx) {
            return ctx.NameEquals("who");
        }

        public void Dispatch(ChatCommandContext ctx) {
            StringBuilder whoChanSB = new();
            string whoChanStr = ctx.Args.FirstOrDefault();

            if(string.IsNullOrEmpty(whoChanStr)) {
                lock(ctx.Chat.UsersAccess)
                    foreach(ChatUser whoUser in ctx.Chat.Users) {
                        whoChanSB.Append(@"<a href=""javascript:void(0);"" onclick=""UI.InsertChatText(this.innerHTML);""");

                        if(whoUser == ctx.User)
                            whoChanSB.Append(@" style=""font-weight: bold;""");

                        whoChanSB.Append('>');
                        whoChanSB.Append(whoUser.DisplayName);
                        whoChanSB.Append("</a>, ");
                    }

                if(whoChanSB.Length > 2)
                    whoChanSB.Length -= 2;

                ctx.Chat.SendTo(ctx.User, new LegacyCommandResponse(LCR.USERS_LISTING_SERVER, false, whoChanSB));
            } else {
                ChatChannel whoChan;
                lock(ctx.Chat.ChannelsAccess)
                    whoChan = ctx.Chat.Channels.FirstOrDefault(c => c.NameEquals(whoChanStr));

                if(whoChan == null) {
                    ctx.Chat.SendTo(ctx.User, new LegacyCommandResponse(LCR.CHANNEL_NOT_FOUND, true, whoChanStr));
                    return;
                }

                if(whoChan.Rank > ctx.User.Rank || (whoChan.HasPassword && !ctx.User.Can(ChatUserPermissions.JoinAnyChannel))) {
                    ctx.Chat.SendTo(ctx.User, new LegacyCommandResponse(LCR.USERS_LISTING_ERROR, true, whoChanStr));
                    return;
                }

                foreach(ChatUser whoUser in whoChan.GetUsers()) {
                    whoChanSB.Append(@"<a href=""javascript:void(0);"" onclick=""UI.InsertChatText(this.innerHTML);""");

                    if(whoUser == ctx.User)
                        whoChanSB.Append(@" style=""font-weight: bold;""");

                    whoChanSB.Append('>');
                    whoChanSB.Append(whoUser.DisplayName);
                    whoChanSB.Append("</a>, ");
                }

                if(whoChanSB.Length > 2)
                    whoChanSB.Length -= 2;

                ctx.Chat.SendTo(ctx.User, new LegacyCommandResponse(LCR.USERS_LISTING_CHANNEL, false, whoChan.Name, whoChanSB));
            }
        }
    }
}