src/modules/m_blockcaps.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2013, 2017-2018 Sadie Powell <sadie@witchery.services>
   5  *   Copyright (C) 2012-2014, 2016 Attila Molnar <attilamolnar@hush.com>
   6  *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
   7  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   8  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   9  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
  10  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
  11  *   Copyright (C) 2006, 2008-2009 Craig Edwards <brain@inspircd.org>
  12  *
  13  * This file is part of InspIRCd.  InspIRCd is free software: you can
  14  * redistribute it and/or modify it under the terms of the GNU General Public
  15  * License as published by the Free Software Foundation, version 2.
  16  *
  17  * This program is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  19  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26
  27 #include "inspircd.h"
  28 #include "modules/exemption.h"
  29
  30 class ModuleBlockCAPS : public Module
  31 {
  32         CheckExemption::EventProvider exemptionprov;
  33         SimpleChannelModeHandler bc;
  34         unsigned int percent;
  35         unsigned int minlen;
  36         std::bitset<UCHAR_MAX> lowercase;
  37         std::bitset<UCHAR_MAX> uppercase;
  38
  39 public:
  40         ModuleBlockCAPS()
  41                 : exemptionprov(this)
  42                 , bc(this, "blockcaps", 'B')
  43         {
  44         }
  45
  46         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
  47         {
  48                 tokens["EXTBAN"].push_back('B');
  49         }
  50
  51         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
  52         {
  53                 if (target.type == MessageTarget::TYPE_CHANNEL)
  54                 {
  55                         if (!IS_LOCAL(user))
  56                                 return MOD_RES_PASSTHRU;
  57
  58                         Channel* c = target.Get<Channel>();
  59                         ModResult res = CheckExemption::Call(exemptionprov, user, c, "blockcaps");
  60
  61                         if (res == MOD_RES_ALLOW)
  62                                 return MOD_RES_PASSTHRU;
  63
  64                         if (!c->GetExtBanStatus(user, 'B').check(!c->IsModeSet(bc)))
  65                         {
  66                                 // If the message is a CTCP then we skip it unless it is
  67                                 // an ACTION in which case we just check against the body.
  68                                 std::string ctcpname;
  69                                 std::string message(details.text);
  70                                 if (details.IsCTCP(ctcpname, message))
  71                                 {
  72                                         // If the CTCP is not an action then skip it.
  73                                         if (!irc::equals(ctcpname, "ACTION"))
  74                                                 return MOD_RES_PASSTHRU;
  75                                 }
  76
  77                                 // If the message is shorter than the minimum length
  78                                 // then we don't need to do anything else.
  79                                 size_t length = message.length();
  80                                 if (length < minlen)
  81                                         return MOD_RES_PASSTHRU;
  82
  83                                 // Count the characters to see how many upper case and
  84                                 // ignored (non upper or lower) characters there are.
  85                                 size_t upper = 0;
  86                                 for (std::string::const_iterator iter = message.begin(); iter != message.end(); ++iter)
  87                                 {
  88                                         unsigned char chr = static_cast<unsigned char>(*iter);
  89                                         if (uppercase.test(chr))
  90                                                 upper += 1;
  91                                         else if (!lowercase.test(chr))
  92                                                 length -= 1;
  93                                 }
  94
  95                                 // Calculate the percentage which is upper case. If the
  96                                 // message was entirely symbols then it can't contain
  97                                 // any upper case letters.
  98                                 if (length > 0 && round((upper * 100) / length) >= percent)
  99                                 {
 100                                         const std::string msg = InspIRCd::Format("Your message cannot contain %d%% or more capital letters if it's longer than %d characters", percent, minlen);
 101                                         user->WriteNumeric(Numerics::CannotSendTo(c, msg));
 102                                         return MOD_RES_DENY;
 103                                 }
 104                         }
 105                 }
 106                 return MOD_RES_PASSTHRU;
 107         }
 108
 109         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 110         {
 111                 ConfigTag* tag = ServerInstance->Config->ConfValue("blockcaps");
 112                 percent = tag->getUInt("percent", 100, 1, 100);
 113                 minlen = tag->getUInt("minlen", 1, 1, ServerInstance->Config->Limits.MaxLine);
 114
 115                 lowercase.reset();
 116                 const std::string lower = tag->getString("lowercase", "abcdefghijklmnopqrstuvwxyz");
 117                 for (std::string::const_iterator iter = lower.begin(); iter != lower.end(); ++iter)
 118                         lowercase.set(static_cast<unsigned char>(*iter));
 119
 120                 uppercase.reset();
 121                 const std::string upper = tag->getString("uppercase", tag->getString("capsmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 1));
 122                 for (std::string::const_iterator iter = upper.begin(); iter != upper.end(); ++iter)
 123                         uppercase.set(static_cast<unsigned char>(*iter));
 124         }
 125
 126         Version GetVersion() CXX11_OVERRIDE
 127         {
 128                 return Version("Provides support to block all-CAPS channel messages and notices", VF_VENDOR);
 129         }
 130 };
 131
 132 MODULE_INIT(ModuleBlockCAPS)