Adds initial AltBackup app

When deactivating an app, AltStore will first install AltBackup in its place. This allows AltBackup to access the (soon to be) inactive app’s sandbox, and backup all files to a shared app group with AltStore. Later when activating, AltStore will again install AltBackup and use it to restore files before installing the actual app again.
2026-02-12 16:23:32 +01:00 · 2020-05-15 11:35:44 -07:00
parent b9b2afa200
commit 47cf59a1ad
13 changed files with 983 additions and 3 deletions
--- a/AltBackup/ViewController.swift
+++ b/AltBackup/ViewController.swift
@@ -0,0 +1,131 @@
+//
+//  ViewController.swift
+//  AltBackup
+//
+//  Created by Riley Testut on 5/11/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+class ViewController: UIViewController
+{
+    private let backupController = BackupController()
+    
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
+    }
+    
+    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?)
+    {
+        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
+        
+        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.backup), name: AppDelegate.startBackupNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.restore), name: AppDelegate.startRestoreNotification, object: nil)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError()
+    }
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.view.backgroundColor = .altstoreBackground
+        
+        let textLabel = UILabel(frame: .zero)
+        textLabel.font = UIFont.preferredFont(forTextStyle: .title2)
+        textLabel.textColor = .altstoreText
+        textLabel.text = NSLocalizedString("Backing up app data…", comment: "")
+        
+        let activityIndicatorView = UIActivityIndicatorView(style: .whiteLarge)
+        activityIndicatorView.color = .altstoreText
+        activityIndicatorView.startAnimating()
+        
+        #if DEBUG
+        let button1 = UIButton(type: .system)
+        button1.setTitle("Backup", for: .normal)
+        button1.setTitleColor(.white, for: .normal)
+        button1.titleLabel?.font = UIFont.preferredFont(forTextStyle: .body)
+        button1.addTarget(self, action: #selector(ViewController.backup), for: .primaryActionTriggered)
+        
+        let button2 = UIButton(type: .system)
+        button2.setTitle("Restore", for: .normal)
+        button2.setTitleColor(.white, for: .normal)
+        button2.titleLabel?.font = UIFont.preferredFont(forTextStyle: .body)
+        button2.addTarget(self, action: #selector(ViewController.restore), for: .primaryActionTriggered)
+        
+        let arrangedSubviews = [textLabel, activityIndicatorView, button1, button2]
+        #else
+        let arrangedSubviews = [textLabel, activityIndicatorView]
+        #endif
+        
+        let stackView = UIStackView(arrangedSubviews: arrangedSubviews)
+        stackView.translatesAutoresizingMaskIntoConstraints = false
+        stackView.spacing = 22
+        stackView.axis = .vertical
+        stackView.alignment = .center
+        self.view.addSubview(stackView)
+        
+        NSLayoutConstraint.activate([stackView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
+                                     stackView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor)])
+    }
+}
+
+private extension ViewController
+{
+    @objc func backup()
+    {
+        self.backupController.performBackup { (result) in
+            let appName = Bundle.main.object(forInfoDictionaryKey: "CFBundleDisplayName") as? String ??
+                Bundle.main.object(forInfoDictionaryKey: kCFBundleNameKey as String) as? String ??
+                NSLocalizedString("App", comment: "")
+
+            let title = String(format: NSLocalizedString("%@ could not be backed up.", comment: ""), appName)
+            self.process(result, errorTitle: title)
+        }
+    }
+    
+    @objc func restore()
+    {
+        self.backupController.restoreBackup { (result) in
+            let appName = Bundle.main.object(forInfoDictionaryKey: "CFBundleDisplayName") as? String ??
+                Bundle.main.object(forInfoDictionaryKey: kCFBundleNameKey as String) as? String ??
+                NSLocalizedString("App", comment: "")
+
+            let title = String(format: NSLocalizedString("%@ could not be restored.", comment: ""), appName)
+            self.process(result, errorTitle: title)
+        }
+    }
+}
+
+private extension ViewController
+{
+    func process(_ result: Result<Void, Error>, errorTitle: String)
+    {
+        DispatchQueue.main.async {
+            switch result
+            {
+            case .success: break
+            case .failure(let error as NSError):
+                let message: String
+
+                if let sourceDescription = error.sourceDescription
+                {
+                    message = error.localizedDescription + "\n\n" + sourceDescription
+                }
+                else
+                {
+                    message = error.localizedDescription
+                }
+
+                let alertController = UIAlertController(title: errorTitle, message: message, preferredStyle: .alert)
+                alertController.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .default, handler: nil))
+                self.present(alertController, animated: true, completion: nil)
+            }
+            
+            NotificationCenter.default.post(name: AppDelegate.operationDidFinishNotification, object: nil, userInfo: [AppDelegate.operationResultKey: result])
+        }
+    }
+}