Datensicherheit: Backup, Verschlüsselung, App-Sperre (Kapitel 13.3)
Automatisches rollierendes Backup der Datenbank beim Start mit Wiederherstellung über die Einstellungen, versionierte Schema-Migration, optionale Passwort-Verschlüsselung der LiteDB-Datei und eine App-Sperre nach Inaktivität mit eigenem Passwort. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Claude Sonnet 5
@@ -266,6 +266,118 @@
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</ScrollViewer>
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</ContentPage>
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<!-- Tab: Sicherheit (13.3) -->
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<ContentPage Header="Sicherheit">
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<ScrollViewer>
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<StackPanel Margin="32,20,32,28" Spacing="24" MaxWidth="560">
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<!-- Datensicherung -->
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<StackPanel Spacing="10">
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<TextBlock Text="Datensicherung" FontSize="16" FontWeight="SemiBold"/>
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<TextBlock Text="Bei jedem Start wird automatisch ein Backup der Datenbank angelegt (die letzten 10 werden behalten)."
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FontSize="12" Opacity="0.6" TextWrapping="Wrap"/>
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<Button Content="Jetzt sichern" Command="{Binding CreateBackupNowCommand}"
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HorizontalAlignment="Left"/>
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<TextBlock Text="{Binding BackupStatus}" Foreground="Green" FontSize="12"
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IsVisible="{Binding BackupStatus, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
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<ItemsControl ItemsSource="{Binding Backups}">
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<ItemsControl.ItemTemplate>
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<DataTemplate DataType="vm:BackupListItem">
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<Border BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
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BorderThickness="0,0,0,1" Padding="0,7">
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<Grid ColumnDefinitions="*,Auto">
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<TextBlock Grid.Column="0" Text="{Binding Display}"
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VerticalAlignment="Center" FontSize="13"/>
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<Button Grid.Column="1" Content="Wiederherstellen" FontSize="12" Padding="10,4"
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Command="{Binding $parent[ItemsControl].((vm:SettingsViewModel)DataContext).RestoreBackupCommand}"
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CommandParameter="{Binding}"/>
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</Grid>
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</Border>
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</DataTemplate>
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</ItemsControl.ItemTemplate>
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</ItemsControl>
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<TextBlock Text="Noch keine Backups vorhanden." Opacity="0.35" FontSize="12"
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IsVisible="{Binding !Backups.Count}"/>
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</StackPanel>
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<Separator/>
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<!-- Datenbank-Verschlüsselung -->
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<StackPanel Spacing="10">
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<TextBlock Text="Datenbank-Verschlüsselung" FontSize="16" FontWeight="SemiBold"/>
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<TextBlock Text="Schützt die Datenbankdatei auf der Festplatte mit einem Passwort. Ohne das Passwort kann die App die Datenbank beim Start nicht öffnen — bei Verlust sind die Daten nicht mehr zugänglich."
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FontSize="12" Opacity="0.6" TextWrapping="Wrap"/>
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<TextBlock FontSize="13" FontWeight="SemiBold">
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<Run Text="Status: "/>
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<Run Text="{Binding DbEncryptionStatusLabel}"/>
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</TextBlock>
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<StackPanel Spacing="4" IsVisible="{Binding IsDbEncrypted}">
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<TextBlock Text="Aktuelles Passwort" FontSize="12" Opacity="0.7"/>
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<TextBox Text="{Binding CurrentDbPassword}" PasswordChar="●"/>
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</StackPanel>
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<Grid ColumnDefinitions="*,12,*">
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<StackPanel Grid.Column="0" Spacing="4">
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<TextBlock Text="Neues Passwort" FontSize="12" Opacity="0.7"/>
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<TextBox Text="{Binding NewDbPassword}" PasswordChar="●"/>
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</StackPanel>
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<StackPanel Grid.Column="2" Spacing="4">
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<TextBlock Text="Wiederholen" FontSize="12" Opacity="0.7"/>
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<TextBox Text="{Binding NewDbPasswordConfirm}" PasswordChar="●"/>
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</StackPanel>
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</Grid>
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<TextBlock Text="{Binding DbPasswordError}" Foreground="Red" FontSize="12"
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IsVisible="{Binding DbPasswordError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
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<StackPanel Orientation="Horizontal" Spacing="8">
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<Button Content="Passwort speichern" Command="{Binding SaveDbPasswordCommand}"/>
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<Button Content="Verschlüsselung entfernen" Command="{Binding RemoveDbPasswordCommand}"
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IsVisible="{Binding IsDbEncrypted}"/>
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</StackPanel>
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<TextBlock Text="Nach dem Ändern wird die App automatisch neu gestartet."
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FontSize="11" Opacity="0.5"/>
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</StackPanel>
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<Separator/>
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<!-- App-Sperre nach Inaktivität -->
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<StackPanel Spacing="10">
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<TextBlock Text="App-Sperre nach Inaktivität" FontSize="16" FontWeight="SemiBold"/>
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<TextBlock Text="Sperrt die Oberfläche nach einer Zeit ohne Maus-/Tastatureingabe. Eigenes Passwort, unabhängig von der Datenbank-Verschlüsselung."
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FontSize="12" Opacity="0.6" TextWrapping="Wrap"/>
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<CheckBox Content="App-Sperre aktivieren" IsChecked="{Binding AppLockEnabled}"/>
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<StackPanel Spacing="4" MaxWidth="200">
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<TextBlock Text="Zeit bis zur Sperre (Minuten)" FontSize="12" Opacity="0.7"/>
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<NumericUpDown Value="{Binding AppLockTimeoutMinutes}" Minimum="1" Maximum="120" FormatString="0"/>
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</StackPanel>
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<Grid ColumnDefinitions="*,12,*">
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<StackPanel Grid.Column="0" Spacing="4">
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<TextBlock Text="Passwort (leer lassen, um es zu behalten)" FontSize="12" Opacity="0.7"/>
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<TextBox Text="{Binding AppLockNewPassword}" PasswordChar="●"/>
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</StackPanel>
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<StackPanel Grid.Column="2" Spacing="4">
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<TextBlock Text="Wiederholen" FontSize="12" Opacity="0.7"/>
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<TextBox Text="{Binding AppLockNewPasswordConfirm}" PasswordChar="●"/>
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</StackPanel>
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</Grid>
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<TextBlock Text="{Binding AppLockPasswordError}" Foreground="Red" FontSize="12"
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IsVisible="{Binding AppLockPasswordError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
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<Button Content="Speichern" Command="{Binding SaveAppLockSettingsCommand}" HorizontalAlignment="Left"/>
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<TextBlock Text="{Binding AppLockStatus}" Foreground="Green" FontSize="12"
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IsVisible="{Binding AppLockStatus, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
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</StackPanel>
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</StackPanel>
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</ScrollViewer>
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</ContentPage>
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</TabbedPage>
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</Grid>
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</UserControl>
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@@ -1,7 +1,10 @@
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using Avalonia.Controls;
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using Avalonia.Interactivity;
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using Avalonia.Platform.Storage;
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using LehrerApp.Desktop.ViewModels;
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using LehrerApp.Desktop.ViewModels.Settings;
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using LehrerApp.Desktop.Views.Shared;
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using Microsoft.Extensions.DependencyInjection;
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namespace LehrerApp.Desktop.Views.Settings;
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@@ -9,6 +12,30 @@ public partial class SettingsView : UserControl
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{
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public SettingsView() => InitializeComponent();
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protected override void OnDataContextChanged(EventArgs e)
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{
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base.OnDataContextChanged(e);
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if (DataContext is SettingsViewModel vm)
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{
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vm.OnConfirmRestore = ShowRestoreConfirmDialog;
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vm.OnAppLockChanged = () => App.Services.GetRequiredService<AppLockViewModel>().ApplyConfig();
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}
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}
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private async Task<bool> ShowRestoreConfirmDialog(BackupListItem item)
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{
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var info = new ConfirmDialogInfo
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{
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Title = "Backup wiederherstellen?",
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Message = $"Die aktuelle Datenbank wird durch das Backup vom {item.Display} ersetzt. " +
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"Die App wird danach automatisch neu gestartet.",
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ConfirmText = "Wiederherstellen",
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};
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var dialog = new ConfirmDialog { DataContext = info };
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var owner = TopLevel.GetTopLevel(this) as Window;
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return owner is not null && await dialog.ShowDialog<bool>(owner);
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}
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private async void OnImportClick(object? sender, RoutedEventArgs e)
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{
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var topLevel = TopLevel.GetTopLevel(this);
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