BSO-Launcher/Services/Settings.cs

using System.Security.Cryptography;
using System.Text;
using System.Text.Json;

namespace BSO.Launcher;

/// <summary>
/// Einstellungen und Anmeldung in %LocalAppData%\BSO Launcher\settings.json. Der Token ist mit DPAPI verschluesselt
/// (nur dieser Windows-Benutzer auf diesem PC kann ihn lesen).
/// </summary>
public sealed class Settings
{
    public static string Folder => Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "BSO Launcher");
    /// <summary>Mit -dev eigene Datei: die Anmeldung gilt nur fuer die Website, bei der sie gemacht wurde.</summary>
    static string FilePath => Path.Combine(Folder, Api.Dev ? "settings.dev.json" : "settings.json");
    static readonly JsonSerializerOptions Options = new() { WriteIndented = true };

    public string? Username { get; set; }
    public string? ProtectedToken { get; set; }
    /// <summary>Spielordner von Hand gewaehlt (sonst automatisch aus den Steam-Bibliotheken).</summary>
    public string? GameFolder { get; set; }
    public string Server { get; set; } = "127.0.0.1:7777";
    public bool AutoConnect { get; set; } = true;
    public bool KeepOpen { get; set; }
    public bool AutoUpdateMod { get; set; } = true;

    [System.Text.Json.Serialization.JsonIgnore]
    public string? Token
    {
        get
        {
            if (string.IsNullOrEmpty(ProtectedToken)) return null;
            try { return Encoding.UTF8.GetString(ProtectedData.Unprotect(Convert.FromBase64String(ProtectedToken), null, DataProtectionScope.CurrentUser)); }
            catch { return null; }
        }
        set => ProtectedToken = value == null ? null
            : Convert.ToBase64String(ProtectedData.Protect(Encoding.UTF8.GetBytes(value), null, DataProtectionScope.CurrentUser));
    }

    public static Settings Load()
    {
        try
        {
            if (File.Exists(FilePath)) return JsonSerializer.Deserialize<Settings>(File.ReadAllText(FilePath)) ?? new Settings();
        }
        catch (Exception e) { LauncherLog.Error("settings.json nicht lesbar: " + e.Message); }
        return new Settings();
    }

    public void Save()
    {
        Directory.CreateDirectory(Folder);
        string tmp = FilePath + ".tmp";
        File.WriteAllText(tmp, JsonSerializer.Serialize(this, Options));
        File.Move(tmp, FilePath, true);
    }
}