eqemu-server/common/profanity_manager.cpp

/*	EQEmu: EQEmulator

	Copyright (C) 2001-2026 EQEmu Development Team

	This program 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; either version 3 of the License, or
	(at your option) any later version.

	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 "profanity_manager.h"

#include "common/dbcore.h"
#include "common/eqemu_logsys.h"
#include "common/strings.h"

#include <algorithm>
#include <cctype>
#include <cstring>


static std::list<std::string> profanity_list;
static bool update_originator_flag = false;

bool EQ::ProfanityManager::LoadProfanityList(DBcore *db) {
	if (update_originator_flag == true) {
		update_originator_flag = false;
		return true;
	}

	if (!load_database_entries(db)) {
		return false;
	}

	return true;
}

bool EQ::ProfanityManager::UpdateProfanityList(DBcore *db) {
	if (!load_database_entries(db)) {
		return false;
	}

	update_originator_flag = true;

	return true;
}

bool EQ::ProfanityManager::DeleteProfanityList(DBcore *db) {
	if (!clear_database_entries(db))
		return false;

	update_originator_flag = true;

	return true;
}

bool EQ::ProfanityManager::AddProfanity(DBcore *db, std::string profanity) {
	if (!db || profanity.empty()) {
		return false;
	}

	std::string entry = Strings::ToLower(profanity);

	if (check_for_existing_entry(entry)) {
		return true;
	}

	if (entry.length() < REDACTION_LENGTH_MIN) {
		return false;
	}

	profanity_list.push_back(entry);

	auto query = fmt::format(
		"REPLACE INTO `profanity_list` (`word`) VALUES ('{}')",
		profanity
	);
	auto results = db->QueryDatabase(query);

	if (!results.Success()) {
		return false;
	}

	update_originator_flag = true;

	return true;
}

bool EQ::ProfanityManager::RemoveProfanity(DBcore *db, std::string profanity) {
	if (!db || profanity.empty()) {
		return false;
	}

	std::string entry = Strings::ToLower(profanity);

	if (!check_for_existing_entry(entry)) {
		return true;
	}

	profanity_list.remove(entry);

	auto query = fmt::format(
		"DELETE FROM `profanity_list` WHERE `word` = '{}'",
		entry
	);
	auto results = db->QueryDatabase(query);

	if (!results.Success()) {
		return false;
	}

	update_originator_flag = true;

	return true;
}

void EQ::ProfanityManager::RedactMessage(char *message) {
	if (!message) {
		return;
	}

	std::string test_message = Strings::ToLower(message);
	// hard-coded max length based on channel message buffer size (4096 bytes)..
	// ..will need to change or remove if other sources are used for redaction
	if (test_message.length() < REDACTION_LENGTH_MIN || test_message.length() >= 4096) {
		return;
	}

	for (const auto &iter : profanity_list) { // consider adding textlink checks if it becomes an issue
		size_t pos = 0;
		size_t start_pos = 0;

		while (pos != std::string::npos) {
			pos = test_message.find(iter, start_pos);
			if (pos == std::string::npos) {
				continue;
			}

			if (
				(pos + iter.length()) == test_message.length() ||
				!isalpha(test_message.at(pos + iter.length()))
			) {
				if (pos == 0 || !isalpha(test_message.at(pos - 1))) {
					memset((message + pos), REDACTION_CHARACTER, iter.length());
				}
			}

			start_pos = (pos + iter.length());
		}
	}
}

void EQ::ProfanityManager::RedactMessage(std::string &message) {
	if (message.length() < REDACTION_LENGTH_MIN || message.length() >= 4096) {
		return;
	}

	std::string test_message = Strings::ToLower(message);

	for (const auto &iter : profanity_list) {
		size_t pos = 0;
		size_t start_pos = 0;

		while (pos != std::string::npos) {
			pos = test_message.find(iter, start_pos);
			if (pos == std::string::npos) {
				continue;
			}

			if (
				(pos + iter.length()) == test_message.length() ||
				!isalpha(test_message.at(pos + iter.length()))
			) {
				if (pos == 0 || !isalpha(test_message.at(pos - 1))) {
					message.replace(pos, iter.length(), iter.length(), REDACTION_CHARACTER);
				}
			}

			start_pos = (pos + iter.length());
		}
	}
}


bool EQ::ProfanityManager::ContainsCensoredLanguage(const std::string &message) {
	if (message.length() < REDACTION_LENGTH_MIN || message.length() >= 4096) {
		return false;
	}

	std::string test_message = Strings::ToLower(message);

	for (const auto &iter : profanity_list) {
		if (test_message.find(iter) != std::string::npos) {
			return true;
		}
	}

	return false;
}

const std::list<std::string> &EQ::ProfanityManager::GetProfanityList() {
	return profanity_list;
}

bool EQ::ProfanityManager::IsCensorshipActive() {
	return profanity_list.size() != 0;
}

bool EQ::ProfanityManager::load_database_entries(DBcore *db) {
	if (!db) {
		return false;
	}

	profanity_list.clear();

	std::string query = "SELECT `word` FROM `profanity_list`";
	auto results = db->QueryDatabase(query);
	if (!results.Success()) {
		return false;
	}

	for (auto row : results) {
		std::string entry = Strings::ToLower(row[0]);
		if (entry.length() >= REDACTION_LENGTH_MIN) {
			if (!check_for_existing_entry(entry)) {
				profanity_list.push_back(entry);
			}
		}
	}

	LogInfo("Loaded [{}] profanity entries", Strings::Commify(profanity_list.size()));

	return true;
}

bool EQ::ProfanityManager::clear_database_entries(DBcore *db) {
	if (!db) {
		return false;
	}

	profanity_list.clear();

	std::string query = "DELETE FROM `profanity_list`";
	auto results = db->QueryDatabase(query);

	if (!results.Success()) {
		return false;
	}

	return true;
}

bool EQ::ProfanityManager::check_for_existing_entry(const std::string& profanity) {
	if (profanity.empty()) {
		return false;
	}

	for (const auto &iter : profanity_list) {
		if (!iter.compare(profanity)) {
			return true;
		}
	}

	return false;
}