sharp-chat/SharpChat/Packet/BanListPacket.cs

using System;
using System.Linq;
using System.Text;

namespace SharpChat.Packet {
    public class BanListPacket : ServerPacket {
        private readonly string[] Bans;

        public BanListPacket(string[] bans) {
            Bans = bans ?? throw new ArgumentNullException(nameof(bans));
        }

        public override string Pack() {
            StringBuilder sb = new();

            sb.AppendFormat("2\t{0}\t-1\t0\fbanlist\f", DateTimeOffset.Now.ToUnixTimeSeconds());

            foreach(string ban in Bans)
                sb.AppendFormat(@"<a href=""javascript:void(0);"" onclick=""Chat.SendMessageWrapper('/unban '+ this.innerHTML);"">{0}</a>, ", ban);

            if(Bans.Any())
                sb.Length -= 2;

            sb.AppendFormat("\t{0}\t10010", SequenceId);

            return sb.ToString();
        }
    }
}