Add Full system backup feature (#13945)

MediaBrowser.Controller/SystemBackupService/IBackupService.cs

@@ -0,0 +1,48 @@
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using MediaBrowser.Controller.SystemBackupService;
+
+namespace Jellyfin.Server.Implementations.SystemBackupService;
+
+/// <summary>
+/// Defines an interface to restore and backup the jellyfin system.
+/// </summary>
+public interface IBackupService
+{
+    /// <summary>
+    /// Creates a new Backup zip file containing the current state of the application.
+    /// </summary>
+    /// <param name="backupOptions">The backup options.</param>
+    /// <returns>A task.</returns>
+    Task<BackupManifestDto> CreateBackupAsync(BackupOptionsDto backupOptions);
+
+    /// <summary>
+    /// Gets a list of backups that are available to be restored from.
+    /// </summary>
+    /// <returns>A list of backup paths.</returns>
+    Task<BackupManifestDto[]> EnumerateBackups();
+
+    /// <summary>
+    /// Gets a single backup manifest if the path defines a valid Jellyfin backup archive.
+    /// </summary>
+    /// <param name="archivePath">The path to be loaded.</param>
+    /// <returns>The containing backup manifest or null if not existing or compatiable.</returns>
+    Task<BackupManifestDto?> GetBackupManifest(string archivePath);
+
+    /// <summary>
+    /// Restores an backup zip file created by jellyfin.
+    /// </summary>
+    /// <param name="archivePath">Path to the archive.</param>
+    /// <returns>A Task.</returns>
+    /// <exception cref="FileNotFoundException">Thrown when an invalid or missing file is specified.</exception>
+    /// <exception cref="NotSupportedException">Thrown when attempt to load an unsupported backup is made.</exception>
+    /// <exception cref="InvalidOperationException">Thrown for errors during the restore.</exception>
+    Task RestoreBackupAsync(string archivePath);
+
+    /// <summary>
+    /// Schedules a Restore and restarts the server.
+    /// </summary>
+    /// <param name="archivePath">The path to the archive to restore from.</param>
+    void ScheduleRestoreAndRestartServer(string archivePath);
+}