summaryrefslogtreecommitdiff
path: root/src/modules/m_blockcaps.cpp
blob: c36eeabffd1711fc789304550fe296aaa220c740 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2006, 2008 Craig Edwards <craigedwards@brainbox.cc>
 *   Copyright (C) 2006-2007 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
 *
 * This file is part of InspIRCd.  InspIRCd is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 2.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"
#include "modules/exemption.h"

class ModuleBlockCAPS : public Module
{
	CheckExemption::EventProvider exemptionprov;
	SimpleChannelModeHandler bc;
	unsigned int percent;
	unsigned int minlen;
	std::bitset<UCHAR_MAX> lowercase;
	std::bitset<UCHAR_MAX> uppercase;

public:
	ModuleBlockCAPS()
		: exemptionprov(this)
		, bc(this, "blockcaps", 'B')
	{
	}

	void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
	{
		tokens["EXTBAN"].push_back('B');
	}

	ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE
	{
		if (target_type == TYPE_CHANNEL)
		{
			if (!IS_LOCAL(user))
				return MOD_RES_PASSTHRU;

			Channel* c = (Channel*)dest;
			ModResult res = CheckExemption::Call(exemptionprov, user, c, "blockcaps");

			if (res == MOD_RES_ALLOW)
				return MOD_RES_PASSTHRU;

			if (!c->GetExtBanStatus(user, 'B').check(!c->IsModeSet(bc)))
			{
				// If the message is a CTCP then we skip it unless it is
				// an ACTION in which case we strip the prefix and suffix.
				std::string::const_iterator text_begin = text.begin();
				std::string::const_iterator text_end = text.end();
				if (text[0] == '\1')
				{
					// If the CTCP is not an action then skip it.
					if (text.compare(0, 8, "\1ACTION ", 8))
						return MOD_RES_PASSTHRU;

					// Skip the CTCP message characters.
					text_begin += 8;
					if (*text.rbegin() == '\1')
						text_end -= 1;
				}

				// If the message is shorter than the minimum length
				// then we don't need to do anything else.
				size_t length = std::distance(text_begin, text_end);
				if (length < minlen)
					return MOD_RES_PASSTHRU;

				// Count the characters to see how many upper case and
				// ignored (non upper or lower) characters there are.
				size_t upper = 0;
				for (std::string::const_iterator iter = text_begin; iter != text_end; ++iter)
				{
					if (uppercase.test(*iter))
						upper += 1;
					else if (!lowercase.test(*iter))
						length -= 1;
				}

				// Calculate the percentage which is upper case. If the
				// message was entirely symbols then it can't contain
				// any upper case letters.
				if (length > 0 && round((upper * 100) / length) >= percent)
				{
					user->WriteNumeric(ERR_CANNOTSENDTOCHAN, c->name, InspIRCd::Format("Your message cannot contain %d%% or more capital letters if it's longer than %d characters", percent, minlen));
					return MOD_RES_DENY;
				}
			}
		}
		return MOD_RES_PASSTHRU;
	}

	void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
	{
		ConfigTag* tag = ServerInstance->Config->ConfValue("blockcaps");
		percent = tag->getInt("percent", 100, 1, 100);
		minlen = tag->getInt("minlen", 1, 1, ServerInstance->Config->Limits.MaxLine);

		lowercase.reset();
		const std::string lower = tag->getString("lowercase", "abcdefghijklmnopqrstuvwxyz");
		for (std::string::const_iterator iter = lower.begin(); iter != lower.end(); ++iter)
			lowercase.set(*iter);

		uppercase.reset();
		const std::string upper = tag->getString("uppercase", tag->getString("capsmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
		for (std::string::const_iterator iter = upper.begin(); iter != upper.end(); ++iter)
			uppercase.set(*iter);
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Provides support to block all-CAPS channel messages and notices", VF_VENDOR);
	}
};

MODULE_INIT(ModuleBlockCAPS)