Adds “Clear Cache” button to remove temporary files and uninstalled app backups

(cherry picked from commit 3adfc9db6d)

AltStore/Managing Apps/AppManager.swift

@@ -307,6 +307,16 @@ extension AppManager
             presentingViewController.present(alertController, animated: true, completion: nil)
         }
     }
+    
+    func clearAppCache(completion: @escaping (Result<Void, Error>) -> Void)
+    {
+        let clearAppCacheOperation = ClearAppCacheOperation()
+        clearAppCacheOperation.resultHandler = { result in
+            completion(result)
+        }
+        
+        self.run([clearAppCacheOperation], context: nil)
+    }
 }
 
 extension AppManager
@@ -754,6 +764,12 @@ extension AppManager
         let progress = self.refreshProgress[app.bundleIdentifier]
         return progress
     }
+    
+    func isActivelyManagingApp(withBundleID bundleID: String) -> Bool
+    {
+        let isActivelyManaging = self.installationProgress.keys.contains(bundleID) || self.refreshProgress.keys.contains(bundleID)
+        return isActivelyManaging
+    }
 }
 
 extension AppManager
@@ -808,12 +824,6 @@ private extension AppManager
         }
     }
     
-    func isActivelyManagingApp(withBundleID bundleID: String) -> Bool
-    {
-        let isActivelyManaging = self.installationProgress.keys.contains(bundleID) || self.refreshProgress.keys.contains(bundleID)
-        return isActivelyManaging
-    }
-    
     @discardableResult
     private func perform(_ operations: [AppOperation], presentingViewController: UIViewController?, group: RefreshGroup) -> RefreshGroup
     {

AltStore/Operations/ClearAppCacheOperation.swift

@@ -0,0 +1,203 @@
+//
+//  ClearAppCacheOperation.swift
+//  AltStore
+//
+//  Created by Riley Testut on 9/27/22.
+//  Copyright © 2022 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import AltStoreCore
+
+struct BatchError: ALTLocalizedError
+{
+    enum Code: Int, ALTErrorCode
+    {
+        typealias Error = BatchError
+        
+        case batchError
+    }
+    
+    var code: Code = .batchError
+    var underlyingErrors: [Error]
+    
+    var errorTitle: String?
+    var errorFailure: String?
+    
+    init(errors: [Error])
+    {
+        self.underlyingErrors = errors
+    }
+    
+    var errorFailureReason: String {
+        guard !self.underlyingErrors.isEmpty else { return NSLocalizedString("An unknown error occured.", comment: "") }
+        
+        let errorMessages = self.underlyingErrors.map { $0.localizedDescription }
+        
+        let message = errorMessages.joined(separator: "\n\n")
+        return message
+    }
+}
+
+@objc(ClearAppCacheOperation)
+class ClearAppCacheOperation: ResultOperation<Void>
+{
+    private let coordinator = NSFileCoordinator()
+    private let coordinatorQueue = OperationQueue()
+    
+    override init()
+    {
+        self.coordinatorQueue.name = "AltStore - ClearAppCacheOperation Queue"
+    }
+    
+    override func main()
+    {
+        super.main()
+        
+        var allErrors = [Error]()
+        
+        self.clearTemporaryDirectory { result in
+            switch result
+            {
+            case .failure(let batchError as BatchError): allErrors.append(contentsOf: batchError.underlyingErrors)
+            case .failure(let error): allErrors.append(error)
+            case .success: break
+            }
+            
+            self.removeUninstalledAppBackupDirectories { result in
+                switch result
+                {
+                case .failure(let batchError as BatchError): allErrors.append(contentsOf: batchError.underlyingErrors)
+                case .failure(let error): allErrors.append(error)
+                case .success: break
+                }
+                
+                if allErrors.isEmpty
+                {
+                    self.finish(.success(()))
+                }
+                else
+                {
+                    let error = BatchError(errors: allErrors)
+                    self.finish(.failure(error))
+                }
+            }
+        }
+    }
+}
+
+private extension ClearAppCacheOperation
+{
+    func clearTemporaryDirectory(completion: @escaping (Result<Void, Error>) -> Void)
+    {
+        let intent = NSFileAccessIntent.writingIntent(with: FileManager.default.temporaryDirectory, options: [.forDeleting])
+        self.coordinator.coordinate(with: [intent], queue: self.coordinatorQueue) { (error) in
+            do
+            {
+                if let error
+                {
+                    throw error
+                }
+                
+                let fileURLs = try FileManager.default.contentsOfDirectory(at: intent.url,
+                                                                           includingPropertiesForKeys: [],
+                                                                           options: [.skipsSubdirectoryDescendants, .skipsHiddenFiles])
+                var errors = [Error]()
+                
+                for fileURL in fileURLs
+                {
+                    do
+                    {
+                        print("[ALTLog] Removing item from temporary directory:", fileURL.lastPathComponent)
+                        try FileManager.default.removeItem(at: fileURL)
+                    }
+                    catch
+                    {
+                        print("[ALTLog] Failed to remove \(fileURL.lastPathComponent) from temporary directory.", error)
+                        errors.append(error)
+                    }
+                }
+                
+                if !errors.isEmpty
+                {
+                    let error = BatchError(errors: errors)
+                    completion(.failure(error))
+                }
+                else
+                {
+                    completion(.success(()))
+                }
+            }
+            catch
+            {
+                completion(.failure(error))
+            }
+        }
+    }
+    
+    func removeUninstalledAppBackupDirectories(completion: @escaping (Result<Void, Error>) -> Void)
+    {
+        guard let backupsDirectory = FileManager.default.appBackupsDirectory else { return completion(.failure(OperationError.missingAppGroup)) }
+        
+        DatabaseManager.shared.persistentContainer.performBackgroundTask { context in
+            let installedAppBundleIDs = Set(InstalledApp.all(in: context).map { $0.bundleIdentifier })
+            
+            let intent = NSFileAccessIntent.writingIntent(with: backupsDirectory, options: [.forDeleting])
+            self.coordinator.coordinate(with: [intent], queue: self.coordinatorQueue) { (error) in
+                do
+                {
+                    if let error
+                    {
+                        throw error
+                    }
+                    
+                    var isDirectory: ObjCBool = false
+                    guard FileManager.default.fileExists(atPath: intent.url.path, isDirectory: &isDirectory), isDirectory.boolValue else {
+                        completion(.success(()))
+                        return
+                    }
+                    
+                    let fileURLs = try FileManager.default.contentsOfDirectory(at: intent.url,
+                                                                               includingPropertiesForKeys: [.isDirectoryKey, .nameKey],
+                                                                               options: [.skipsSubdirectoryDescendants, .skipsHiddenFiles])
+                    var errors = [Error]()
+                    
+                    for backupDirectory in fileURLs
+                    {
+                        do
+                        {
+                            let resourceValues = try backupDirectory.resourceValues(forKeys: [.isDirectoryKey, .nameKey])
+                            guard let isDirectory = resourceValues.isDirectory, let bundleID = resourceValues.name else { continue }
+
+                            if isDirectory && !installedAppBundleIDs.contains(bundleID) && !AppManager.shared.isActivelyManagingApp(withBundleID: bundleID)
+                            {
+                                print("[ALTLog] Removing backup directory for uninstalled app:", bundleID)
+                                try FileManager.default.removeItem(at: backupDirectory)
+                            }
+                        }
+                        catch
+                        {
+                            print("[ALTLog] Failed to remove app backup directory:", error)
+                            errors.append(error)
+                        }
+                    }
+                    
+                    if !errors.isEmpty
+                    {
+                        let error = BatchError(errors: errors)
+                        completion(.failure(error))
+                    }
+                    else
+                    {
+                        completion(.success(()))
+                    }
+                }
+                catch
+                {
+                    print("[ALTLog] Failed to remove app backup directory:", error)
+                    completion(.failure(error))
+                }
+            }
+        }
+    }
+}

AltStore/Settings/SettingsViewController.swift

@@ -48,6 +48,12 @@ extension SettingsViewController
         case softwareLicenses
     }
     
+    fileprivate enum TechyThingsRow: Int, CaseIterable
+    {
+        case errorLog
+        case clearCache
+    }
+    
     fileprivate enum DebugRow: Int, CaseIterable
     {
         case sendFeedback
@@ -291,6 +297,34 @@ private extension SettingsViewController
         self.present(viewController, animated: true, completion: nil)
     }
     
+    func clearCache()
+    {
+        let alertController = UIAlertController(title: NSLocalizedString("Are you sure you want to clear AltStore's cache?", comment: ""),
+                                                message: NSLocalizedString("This will remove all temporary files as well as backups for uninstalled apps.", comment: ""),
+                                                preferredStyle: .actionSheet)
+        alertController.addAction(UIAlertAction(title: UIAlertAction.cancel.title, style: UIAlertAction.cancel.style) { [weak self] _ in
+            self?.tableView.indexPathForSelectedRow.map { self?.tableView.deselectRow(at: $0, animated: true) }
+        })
+        alertController.addAction(UIAlertAction(title: NSLocalizedString("Clear Cache", comment: ""), style: .destructive) { [weak self] _ in
+            AppManager.shared.clearAppCache { result in
+                DispatchQueue.main.async {
+                    self?.tableView.indexPathForSelectedRow.map { self?.tableView.deselectRow(at: $0, animated: true) }
+                    
+                    switch result
+                    {
+                    case .success: break
+                    case .failure(let error):
+                        let alertController = UIAlertController(title: NSLocalizedString("Unable to Clear Cache", comment: ""), message: error.localizedDescription, preferredStyle: .alert)
+                        alertController.addAction(.ok)
+                        self?.present(alertController, animated: true)
+                    }
+                }
+            }
+        })
+        
+        self.present(alertController, animated: true)
+    }
+    
     @IBAction func handleDebugModeGesture(_ gestureRecognizer: UISwipeGestureRecognizer)
     {
         self.debugGestureCounter += 1
@@ -470,6 +504,14 @@ extension SettingsViewController
                 self.addRefreshAppsShortcut()
             }
             
+        case .techyThings:
+            let row = TechyThingsRow.allCases[indexPath.row]
+            switch row
+            {
+            case .errorLog: break
+            case .clearCache: self.clearCache()
+            }
+            
         case .credits:
             let row = CreditsRow.allCases[indexPath.row]
             switch row