src/modules/m_censor.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2004, 2008-2009 Craig Edwards <craigedwards@brainbox.cc>
   6  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2005, 2007 Robin Burchell <robin+git@viroteck.net>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #include "inspircd.h"
  24 #include "modules/exemption.h"
  25
  26 typedef insp::flat_map<std::string, std::string, irc::insensitive_swo> censor_t;
  27
  28 class ModuleCensor : public Module
  29 {
  30         CheckExemption::EventProvider exemptionprov;
  31         censor_t censors;
  32         SimpleUserModeHandler cu;
  33         SimpleChannelModeHandler cc;
  34
  35  public:
  36         ModuleCensor()
  37                 : exemptionprov(this)
  38                 , cu(this, "u_censor", 'G')
  39                 , cc(this, "censor", 'G')
  40         {
  41         }
  42
  43         // format of a config entry is <badword text="shit" replace="poo">
  44         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
  45         {
  46                 if (!IS_LOCAL(user))
  47                         return MOD_RES_PASSTHRU;
  48
  49                 int numeric = 0;
  50                 const char* targetname = NULL;
  51
  52                 switch (target.type)
  53                 {
  54                         case MessageTarget::TYPE_USER:
  55                         {
  56                                 User* targuser = target.Get<User>();
  57                                 if (!targuser->IsModeSet(cu))
  58                                         return MOD_RES_PASSTHRU;
  59
  60                                 numeric = ERR_CANTSENDTOUSER;
  61                                 targetname = targuser->nick.c_str();
  62                                 break;
  63                         }
  64
  65                         case MessageTarget::TYPE_CHANNEL:
  66                         {
  67                                 Channel* targchan = target.Get<Channel>();
  68                                 if (!targchan->IsModeSet(cc))
  69                                         return MOD_RES_PASSTHRU;
  70
  71                                 ModResult result = CheckExemption::Call(exemptionprov, user, targchan, "censor");
  72                                 if (result == MOD_RES_ALLOW)
  73                                         return MOD_RES_PASSTHRU;
  74
  75                                 numeric = ERR_CANNOTSENDTOCHAN;
  76                                 targetname = targchan->name.c_str();
  77                                 break;
  78                         }
  79
  80                         default:
  81                                 return MOD_RES_PASSTHRU;
  82                 }
  83
  84                 for (censor_t::iterator index = censors.begin(); index != censors.end(); index++)
  85                 {
  86                         size_t censorpos;
  87                         while ((censorpos = irc::find(details.text, index->first)) != std::string::npos)
  88                         {
  89                                 if (index->second.empty())
  90                                 {
  91                                         user->WriteNumeric(numeric, targetname, "Your message contained a censored word (" + index->first + "), and was blocked");
  92                                         return MOD_RES_DENY;
  93                                 }
  94
  95                                 details.text.replace(censorpos, index->first.size(), index->second);
  96                         }
  97                 }
  98                 return MOD_RES_PASSTHRU;
  99         }
 100
 101         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 102         {
 103                 /*
 104                  * reload our config file on rehash - we must destroy and re-allocate the classes
 105                  * to call the constructor again and re-read our data.
 106                  */
 107                 censor_t newcensors;
 108
 109                 ConfigTagList badwords = ServerInstance->Config->ConfTags("badword");
 110                 for (ConfigIter i = badwords.first; i != badwords.second; ++i)
 111                 {
 112                         ConfigTag* tag = i->second;
 113                         const std::string text = tag->getString("text");
 114                         if (text.empty())
 115                                 throw ModuleException("<badword:text> is empty! at " + tag->getTagLocation());
 116
 117                         const std::string replace = tag->getString("replace");
 118                         newcensors[text] = replace;
 119                 }
 120                 censors.swap(newcensors);
 121         }
 122
 123         Version GetVersion() CXX11_OVERRIDE
 124         {
 125                 return Version("Provides user and channel mode +G", VF_VENDOR);
 126         }
 127
 128 };
 129
 130 MODULE_INIT(ModuleCensor)