src/settings.cpp

/* Copyright 2025 Mike Becker. All rights reserved.
*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "settings.h"

#include <format>
#include <algorithm>
#include <fstream>

using namespace fm;

static bool check_author(std::string_view author, std::string_view allowed) {
    // check for exact match
    if (author == allowed) return true;

    // check mail address matching
    if (author.contains(std::format("<{}>", allowed))) return true;

    // check local-part from mail address matching
    if (author.contains(std::format("<{}@", allowed))) return true;

    return false;
}

[[nodiscard]] bool settings::exclude_author(const std::string &author) const {
    // no allow-list means: always allowed
    if (authors.empty()) return false;

    // check all allowed authors
    return !std::ranges::any_of(authors, [&](const auto &allowed) {
        return check_author(author, allowed);
    });
}

std::string_view trim(const std::string& str) {
    size_t s = str.find_first_not_of(" \t\r");
    if (s == std::string::npos) return "";
    size_t l = str.find_last_not_of(" \t\r") + 1 - s;
    return std::string_view{str}.substr(s, l);
}

int settings::parse_authormap(const std::string& path) {
    std::ifstream file(path);

    if (!file.is_open()) {
        return -1;
    }

    std::string line;
    while (std::getline(file, line)) {
        line = trim(line);

        // skip empty lines and comments
        if (line.empty() || line[0] == '#') {
            continue;
        }

        // find delimiter
        size_t delimPos = line.find('=');
        if (delimPos == std::string::npos) {
            return -1;
        }

        auto key = std::string{trim(line.substr(0, delimPos))};
        auto value = std::string{trim(line.substr(delimPos + 1))};
        authormap[std::move(key)] = std::move(value);
    }

    return 0;
}

std::string settings::map_author(std::string_view author) const {
    if (authormap.empty()) return std::string{author};

    for (const auto &[old_name, new_name] : authormap) {
        if (check_author(author, old_name)) return new_name;
    }

    return std::string{author};
}