source: binary-improvements/CoppisAdditions/src/ChatFilter.cs@ 274

using System;
using AllocsFixes.PersistentData;

namespace CoppisAdditions
{
        public class ChatFilter
        {

                public static bool Exec (ClientInfo _cInfo, EnumGameMessages _type, string _message, string _playerName)
                {
                        if (_type == EnumGameMessages.Chat && !string.IsNullOrEmpty (_message)) {
                                if (_cInfo != null) {
                                        Player p = PersistentContainer.Instance.Players [_cInfo.playerId, false];
                                        if (p != null) {
                                                if (_message.Length > p.MaxChatLength) {
                                                        _cInfo.SendPackage (new NetPackageGameMessage (EnumGameMessages.Chat, "Your message was too long. So we blocked it!", "Server (PM)", false, "", false));
                                                        return false;
                                                }
                                                if (p.IsChatMuted) {
                                                        _cInfo.SendPackage (new NetPackageGameMessage (EnumGameMessages.Chat, "Your chat is muted!", "Server (PM)", false, "", false));
                                                        return false;
                                                }

                                                //Check its a command
                                                if (PersistentContainer.Instance.Attributes.HideChatCommands) {
                                                        if (_message.Trim ().StartsWith (PersistentContainer.Instance.Attributes.HideChatCommandPrefix)) {
                                                                _cInfo.SendPackage (new NetPackageGameMessage (EnumGameMessages.Chat, "Command received " + _message, "Server (PM)", false, "", false));
                                                                Log.Out ("Chat command from '" + p.Name + "': " + _message);
                                                                return false;
                                                        }
                                                }
                                        }
                                } else {
                                        Log.Error ("Argument _cInfo null on message: {0}", _message);
                                }
                        }

                        return true;
                }

        }
}