PasswordGenerator.cpp

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/*
 * BastionGuard™
 * Copyright (C) 2025–2026 Calogero Scarnà
 *
 * 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, version 3.
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 * BastionGuard™ is a trademark of Calogero Scarnà.
 * The BastionGuard™ name and branding are not licensed under the GPL.
 */
 
#include "PasswordGenerator.hpp"
 
#include <random>
#include <stdexcept>
#include <vector>
#include <algorithm>
 
char PasswordGenerator::randomFrom(const std::string& charset) {
    if (charset.empty()) {
        throw std::runtime_error("Charset vuoto");
    }
 
    static thread_local std::random_device rd;
    static thread_local std::mt19937 gen(rd());
 
    std::uniform_int_distribution<std::size_t> dist(0, charset.size() - 1);
    return charset[dist(gen)];
}
 
std::string PasswordGenerator::generate(std::size_t length,
                                        bool useUpper,
                                        bool useLower,
                                        bool useDigits,
                                        bool useSymbols) {
    const std::string upper   = "ABCDEFGHJKLMNPQRSTUVWXYZ";
    const std::string lower   = "abcdefghijkmnopqrstuvwxyz";
    const std::string digits  = "23456789";
    const std::string symbols = "!@#$%^&*()-_=+[]{}.?";
 
    std::vector<std::string> enabledSets;
    std::string allChars;
 
    if (useUpper) {
        enabledSets.push_back(upper);
        allChars += upper;
    }
    if (useLower) {
        enabledSets.push_back(lower);
        allChars += lower;
    }
    if (useDigits) {
        enabledSets.push_back(digits);
        allChars += digits;
    }
    if (useSymbols) {
        enabledSets.push_back(symbols);
        allChars += symbols;
    }
 
    if (enabledSets.empty()) {
        throw std::runtime_error("Nessun set di caratteri abilitato");
    }
 
    if (length < enabledSets.size()) {
        length = enabledSets.size();
    }
 
    std::string password;
    password.reserve(length);
 
    for (const auto& set : enabledSets) {
        password.push_back(randomFrom(set));
    }
 
    while (password.size() < length) {
        password.push_back(randomFrom(allChars));
    }
 
    static thread_local std::random_device rd;
    static thread_local std::mt19937 gen(rd());
    std::shuffle(password.begin(), password.end(), gen);
 
    return password;
}