Adds Error Log screen

Allows users to view a history of all errors that occured when performing app operations.

AltStore.xcodeproj/project.pbxproj

@@ -322,11 +322,13 @@
 		BFF615A82510042B00484D3B /* AltStoreCore.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BF66EE7E2501AE50007EE018 /* AltStoreCore.framework */; };
 		D533E8B72727841800A9B5DD /* libAppleArchive.tbd in Frameworks */ = {isa = PBXBuildFile; fileRef = D533E8B62727841800A9B5DD /* libAppleArchive.tbd */; settings = {ATTRIBUTES = (Weak, ); }; };
 		D533E8BE2727BBF800A9B5DD /* libcurl.a in Frameworks */ = {isa = PBXBuildFile; fileRef = D533E8BD2727BBF800A9B5DD /* libcurl.a */; };
+		D54DED1428CBC44B008B27A0 /* ErrorLogTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = D54DED1328CBC44B008B27A0 /* ErrorLogTableViewCell.swift */; };
 		D55E163728776CB700A627A1 /* ComplicationView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D55E163528776CB000A627A1 /* ComplicationView.swift */; };
 		D57DF638271E32F000677701 /* PatchApp.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = D57DF637271E32F000677701 /* PatchApp.storyboard */; };
 		D57DF63F271E51E400677701 /* ALTAppPatcher.m in Sources */ = {isa = PBXBuildFile; fileRef = D57DF63E271E51E400677701 /* ALTAppPatcher.m */; };
 		D57F2C9126E0070200B9FA39 /* EnableJITOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = D57F2C9026E0070200B9FA39 /* EnableJITOperation.swift */; };
 		D57F2C9426E01BC700B9FA39 /* UIDevice+Vibration.swift in Sources */ = {isa = PBXBuildFile; fileRef = D57F2C9326E01BC700B9FA39 /* UIDevice+Vibration.swift */; };
+		D57FE84428C7DB7100216002 /* ErrorLogViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = D57FE84328C7DB7100216002 /* ErrorLogViewController.swift */; };
 		D58916FE28C7C55C00E39C8B /* LoggedError.swift in Sources */ = {isa = PBXBuildFile; fileRef = D58916FD28C7C55C00E39C8B /* LoggedError.swift */; };
 		D593F1942717749A006E82DE /* PatchAppOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = D593F1932717749A006E82DE /* PatchAppOperation.swift */; };
 		D5CA0C4B280E141900469595 /* ManagedPatron.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5CA0C4A280E141900469595 /* ManagedPatron.swift */; };
@@ -820,12 +822,14 @@
 		D533E8B82727B61400A9B5DD /* fragmentzip.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = fragmentzip.h; sourceTree = "<group>"; };
 		D533E8BB2727BBEE00A9B5DD /* libfragmentzip.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libfragmentzip.a; path = Dependencies/fragmentzip/libfragmentzip.a; sourceTree = SOURCE_ROOT; };
 		D533E8BD2727BBF800A9B5DD /* libcurl.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libcurl.a; path = Dependencies/libcurl/libcurl.a; sourceTree = SOURCE_ROOT; };
+		D54DED1328CBC44B008B27A0 /* ErrorLogTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ErrorLogTableViewCell.swift; sourceTree = "<group>"; };
 		D55E163528776CB000A627A1 /* ComplicationView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ComplicationView.swift; sourceTree = "<group>"; };
 		D57DF637271E32F000677701 /* PatchApp.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = PatchApp.storyboard; sourceTree = "<group>"; };
 		D57DF63D271E51E400677701 /* ALTAppPatcher.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ALTAppPatcher.h; sourceTree = "<group>"; };
 		D57DF63E271E51E400677701 /* ALTAppPatcher.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ALTAppPatcher.m; sourceTree = "<group>"; };
 		D57F2C9026E0070200B9FA39 /* EnableJITOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EnableJITOperation.swift; sourceTree = "<group>"; };
 		D57F2C9326E01BC700B9FA39 /* UIDevice+Vibration.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "UIDevice+Vibration.swift"; sourceTree = "<group>"; };
+		D57FE84328C7DB7100216002 /* ErrorLogViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ErrorLogViewController.swift; sourceTree = "<group>"; };
 		D58916FD28C7C55C00E39C8B /* LoggedError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoggedError.swift; sourceTree = "<group>"; };
 		D593F1932717749A006E82DE /* PatchAppOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PatchAppOperation.swift; sourceTree = "<group>"; };
 		D5CA0C4A280E141900469595 /* ManagedPatron.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ManagedPatron.swift; sourceTree = "<group>"; };
@@ -1629,6 +1633,7 @@
 				BFF0B68F23219C6D007A79E1 /* PatreonComponents.swift */,
 				BFF0B6912321A305007A79E1 /* AboutPatreonHeaderView.xib */,
 				BFF0B695232242D3007A79E1 /* LicensesViewController.swift */,
+				D589170128C7D93500E39C8B /* Error Log */,
 				B3EE16B52925E27D00B3B1F5 /* AnisetteManager.swift */,
 			);
 			path = Settings;
@@ -1730,6 +1735,15 @@
 			path = XPC;
 			sourceTree = "<group>";
 		};
+		D589170128C7D93500E39C8B /* Error Log */ = {
+			isa = PBXGroup;
+			children = (
+				D57FE84328C7DB7100216002 /* ErrorLogViewController.swift */,
+				D54DED1328CBC44B008B27A0 /* ErrorLogTableViewCell.swift */,
+			);
+			path = "Error Log";
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXHeadersBuildPhase section */
@@ -2401,6 +2415,7 @@
 				BF8CAE4E248AEABA004D6CCE /* UIDevice+Jailbreak.swift in Sources */,
 				D5E1E7C128077DE90016FC96 /* FetchTrustedSourcesOperation.swift in Sources */,
 				BFE338DF22F0EADB002E24B9 /* FetchSourceOperation.swift in Sources */,
+				D54DED1428CBC44B008B27A0 /* ErrorLogTableViewCell.swift in Sources */,
 				BFB6B21E231870160022A802 /* NewsViewController.swift in Sources */,
 				BFC57A652416C72400EB891E /* DeactivateAppOperation.swift in Sources */,
 				BF3BEFC124086A1E00DE7D55 /* RefreshAppOperation.swift in Sources */,
@@ -2450,6 +2465,7 @@
 				BF08858322DE795100DE9F1E /* MyAppsViewController.swift in Sources */,
 				BFC84A4D2421A19100853474 /* SourcesViewController.swift in Sources */,
 				BFF0B696232242D3007A79E1 /* LicensesViewController.swift in Sources */,
+				D57FE84428C7DB7100216002 /* ErrorLogViewController.swift in Sources */,
 				BFBE0007250AD0E70080826E /* ViewAppIntentHandler.swift in Sources */,
 				BFDB6A0822AAED73007EA6D6 /* ResignAppOperation.swift in Sources */,
 				D593F1942717749A006E82DE /* PatchAppOperation.swift in Sources */,

AltStore/Managing Apps/AppManager.swift

@@ -1677,6 +1677,8 @@ private extension AppManager
         catch
         {
             group.set(.failure(error), forAppWithBundleIdentifier: operation.bundleIdentifier)
+            
+            self.log(error, for: operation)
         }
     }
     
@@ -1701,6 +1703,43 @@ private extension AppManager
         UNUserNotificationCenter.current().add(request)
     }
     
+    func log(_ error: Error, for operation: AppOperation)
+    {
+        // Sanitize NSError on same thread before performing background task.
+        let sanitizedError = (error as NSError).sanitizedForCoreData()
+        
+        let loggedErrorOperation: LoggedError.Operation = {
+            switch operation
+            {
+            case .install: return .install
+            case .update: return .update
+            case .refresh: return .refresh
+            case .activate: return .activate
+            case .deactivate: return .deactivate
+            case .backup: return .backup
+            case .restore: return .restore
+            }
+        }()
+                    
+        DatabaseManager.shared.persistentContainer.performBackgroundTask { context in
+            var app = operation.app
+            if let managedApp = app as? NSManagedObject, let tempApp = context.object(with: managedApp.objectID) as? AppProtocol
+            {
+                app = tempApp
+            }
+            
+            do
+            {
+                _ = LoggedError(error: sanitizedError, app: app, operation: loggedErrorOperation, context: context)
+                try context.save()
+            }
+            catch let saveError
+            {
+                print("[ALTLog] Failed to log error \(sanitizedError.domain) code \(sanitizedError.code) for \(app.bundleIdentifier):", saveError)
+            }
+        }
+    }
+    
     func run(_ operations: [Foundation.Operation], context: OperationContext?, requiresSerialQueue: Bool = false)
     {
         // Find "Install AltStore" operation if it already exists in `context`

AltStore/Operations/OperationError.swift

@@ -11,6 +11,8 @@ import AltSign
 
 enum OperationError: LocalizedError
 {
+    static let domain = OperationError.unknown._domain
+    
     case unknown
     case unknownResult
     case cancelled

AltStore/Settings/Error Log/ErrorLogTableViewCell.swift

@@ -0,0 +1,52 @@
+//
+//  ErrorLogTableViewCell.swift
+//  AltStore
+//
+//  Created by Riley Testut on 9/9/22.
+//  Copyright © 2022 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+@objc(ErrorLogTableViewCell)
+class ErrorLogTableViewCell: UITableViewCell
+{
+    @IBOutlet var appIconImageView: AppIconImageView!
+    
+    @IBOutlet var dateLabel: UILabel!
+    @IBOutlet var errorFailureLabel: UILabel!
+    @IBOutlet var errorCodeLabel: UILabel!
+    @IBOutlet var errorDescriptionTextView: CollapsingTextView!
+    
+    @IBOutlet var menuButton: UIButton!
+    
+    private var didLayoutSubviews = false
+    
+    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView?
+    {
+        let moreButtonFrame = self.convert(self.errorDescriptionTextView.moreButton.frame, from: self.errorDescriptionTextView)
+        guard moreButtonFrame.contains(point) else { return super.hitTest(point, with: event) }
+        
+        // Pass touches through menuButton so user can press moreButton.
+        return self.errorDescriptionTextView.moreButton
+    }
+    
+    override func layoutSubviews()
+    {
+        super.layoutSubviews()
+        
+        self.didLayoutSubviews = true
+    }
+    
+    override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize
+    {
+        if !self.didLayoutSubviews
+        {
+            // Ensure cell is laid out so it will report correct size.
+            self.layoutIfNeeded()
+        }
+        
+        let size = super.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: horizontalFittingPriority, verticalFittingPriority: verticalFittingPriority)
+        return size
+    }
+}

AltStore/Settings/Error Log/ErrorLogViewController.swift

@@ -0,0 +1,294 @@
+//
+//  ErrorLogViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 9/6/22.
+//  Copyright © 2022 Riley Testut. All rights reserved.
+//
+
+import UIKit
+import SafariServices
+
+import AltStoreCore
+import Roxas
+
+import Nuke
+
+class ErrorLogViewController: UITableViewController
+{
+    private lazy var dataSource = self.makeDataSource()
+    private var expandedErrorIDs = Set<NSManagedObjectID>()
+    
+    private lazy var timeFormatter: DateFormatter = {
+        let dateFormatter = DateFormatter()
+        dateFormatter.dateStyle = .none
+        dateFormatter.timeStyle = .short
+        return dateFormatter
+    }()
+    
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
+    }
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.tableView.dataSource = self.dataSource
+        self.tableView.prefetchDataSource = self.dataSource
+    }
+}
+
+private extension ErrorLogViewController
+{
+    func makeDataSource() -> RSTFetchedResultsTableViewPrefetchingDataSource<LoggedError, UIImage>
+    {
+        let fetchRequest = LoggedError.fetchRequest() as NSFetchRequest<LoggedError>
+        fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \LoggedError.date, ascending: false)]
+        fetchRequest.returnsObjectsAsFaults = false
+        
+        let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: DatabaseManager.shared.viewContext, sectionNameKeyPath: #keyPath(LoggedError.localizedDateString), cacheName: nil)
+        
+        let dataSource = RSTFetchedResultsTableViewPrefetchingDataSource<LoggedError, UIImage>(fetchedResultsController: fetchedResultsController)
+        dataSource.proxy = self
+        dataSource.rowAnimation = .fade
+        dataSource.cellConfigurationHandler = { [weak self] (cell, loggedError, indexPath) in
+            guard let self else { return }
+            
+            let cell = cell as! ErrorLogTableViewCell
+            cell.dateLabel.text = self.timeFormatter.string(from: loggedError.date)
+            cell.errorFailureLabel.text = loggedError.localizedFailure ?? NSLocalizedString("Operation Failed", comment: "")
+            
+            switch loggedError.domain
+            {
+            case AltServerErrorDomain: cell.errorCodeLabel?.text = String(format: NSLocalizedString("AltServer Error %@", comment: ""), NSNumber(value: loggedError.code))
+            case OperationError.domain: cell.errorCodeLabel?.text = String(format: NSLocalizedString("AltStore Error %@", comment: ""), NSNumber(value: loggedError.code))
+            default: cell.errorCodeLabel?.text = loggedError.error.localizedErrorCode
+            }
+            
+            let nsError = loggedError.error as NSError
+            let errorDescription = [nsError.localizedDescription, nsError.localizedRecoverySuggestion].compactMap { $0 }.joined(separator: "\n\n")
+            cell.errorDescriptionTextView.text = errorDescription
+            cell.errorDescriptionTextView.maximumNumberOfLines = 5
+            cell.errorDescriptionTextView.isCollapsed = !self.expandedErrorIDs.contains(loggedError.objectID)
+            cell.errorDescriptionTextView.moreButton.addTarget(self, action: #selector(ErrorLogViewController.toggleCollapsingCell(_:)), for: .primaryActionTriggered)
+            
+            cell.appIconImageView.image = nil
+            cell.appIconImageView.isIndicatingActivity = true
+            cell.appIconImageView.layer.borderColor = UIColor.gray.cgColor
+            
+            let displayScale = (self.traitCollection.displayScale == 0.0) ? 1.0 : self.traitCollection.displayScale // 0.0 == "unspecified"
+            cell.appIconImageView.layer.borderWidth = 1.0 / displayScale
+                        
+            if #available(iOS 14, *)
+            {
+                let menu = UIMenu(title: "", children: [
+                    UIAction(title: NSLocalizedString("Copy Error Message", comment: ""), image: UIImage(systemName: "doc.on.doc")) { [weak self] _ in
+                        self?.copyErrorMessage(for: loggedError)
+                    },
+                    UIAction(title: NSLocalizedString("Copy Error Code", comment: ""), image: UIImage(systemName: "doc.on.doc")) { [weak self] _ in
+                        self?.copyErrorCode(for: loggedError)
+                    },
+                    UIAction(title: NSLocalizedString("Search FAQ", comment: ""), image: UIImage(systemName: "magnifyingglass")) { [weak self] _ in
+                        self?.searchFAQ(for: loggedError)
+                    }
+                ])
+
+                cell.menuButton.menu = menu
+            }
+            
+            // Include errorDescriptionTextView's text in cell summary.
+            cell.accessibilityLabel = [cell.errorFailureLabel.text, cell.dateLabel.text, cell.errorCodeLabel.text, cell.errorDescriptionTextView.text].compactMap { $0 }.joined(separator: ". ")
+            
+            // Group all paragraphs together into single accessibility element (otherwise, each paragraph is independently selectable).
+            cell.errorDescriptionTextView.accessibilityLabel = cell.errorDescriptionTextView.text
+        }
+        dataSource.prefetchHandler = { (loggedError, indexPath, completion) in
+            RSTAsyncBlockOperation { (operation) in
+                loggedError.managedObjectContext?.perform {
+                    if let installedApp = loggedError.installedApp
+                    {
+                        installedApp.loadIcon { (result) in
+                            switch result
+                            {
+                            case .failure(let error): completion(nil, error)
+                            case .success(let image): completion(image, nil)
+                            }
+                        }
+                    }
+                    else if let storeApp = loggedError.storeApp
+                    {
+                        ImagePipeline.shared.loadImage(with: storeApp.iconURL, progress: nil) { (response, error) in
+                            guard !operation.isCancelled else { return operation.finish() }
+                            
+                            if let image = response?.image
+                            {
+                                completion(image, nil)
+                            }
+                            else
+                            {
+                                completion(nil, error)
+                            }
+                        }
+                    }
+                    else
+                    {
+                        completion(nil, nil)
+                    }
+                }
+            }
+        }
+        dataSource.prefetchCompletionHandler = { (cell, image, indexPath, error) in
+            let cell = cell as! ErrorLogTableViewCell
+            cell.appIconImageView.image = image
+            cell.appIconImageView.isIndicatingActivity = false
+        }
+        
+        let placeholderView = RSTPlaceholderView()
+        placeholderView.textLabel.text = NSLocalizedString("No Errors", comment: "")
+        placeholderView.detailTextLabel.text = NSLocalizedString("Errors that occur when sideloading or refreshing apps will appear here.", comment: "")
+        dataSource.placeholderView = placeholderView
+        
+        return dataSource
+    }
+}
+
+private extension ErrorLogViewController
+{
+    @IBAction func toggleCollapsingCell(_ sender: UIButton)
+    {
+        let point = self.tableView.convert(sender.center, from: sender.superview)
+        guard let indexPath = self.tableView.indexPathForRow(at: point), let cell = self.tableView.cellForRow(at: indexPath) as? ErrorLogTableViewCell else { return }
+        
+        let loggedError = self.dataSource.item(at: indexPath)
+        
+        if cell.errorDescriptionTextView.isCollapsed
+        {
+            self.expandedErrorIDs.remove(loggedError.objectID)
+        }
+        else
+        {
+            self.expandedErrorIDs.insert(loggedError.objectID)
+        }
+        
+        self.tableView.performBatchUpdates {
+            cell.layoutIfNeeded()
+        }
+    }
+    
+    @IBAction func clearLoggedErrors(_ sender: UIBarButtonItem)
+    {
+        let alertController = UIAlertController(title: NSLocalizedString("Are you sure you want to clear the error log?", comment: ""), message: nil, preferredStyle: .actionSheet)
+        alertController.popoverPresentationController?.barButtonItem = sender
+        alertController.addAction(.cancel)
+        alertController.addAction(UIAlertAction(title: NSLocalizedString("Clear Error Log", comment: ""), style: .destructive) { _ in
+            self.clearLoggedErrors()
+        })
+        self.present(alertController, animated: true)
+    }
+    
+    func clearLoggedErrors()
+    {
+        DatabaseManager.shared.purgeLoggedErrors { result in
+            do
+            {
+                try result.get()
+            }
+            catch
+            {
+                DispatchQueue.main.async {
+                    let alertController = UIAlertController(title: NSLocalizedString("Failed to Clear Error Log", comment: ""), message: error.localizedDescription, preferredStyle: .alert)
+                    alertController.addAction(.ok)
+                    self.present(alertController, animated: true)
+                }
+            }
+        }
+    }
+    
+    func copyErrorMessage(for loggedError: LoggedError)
+    {
+        let nsError = loggedError.error as NSError
+        let errorMessage = [nsError.localizedDescription, nsError.localizedRecoverySuggestion].compactMap { $0 }.joined(separator: "\n\n")
+        
+        UIPasteboard.general.string = errorMessage
+    }
+    
+    func copyErrorCode(for loggedError: LoggedError)
+    {
+        let errorCode = loggedError.error.localizedErrorCode
+        UIPasteboard.general.string = errorCode
+    }
+    
+    func searchFAQ(for loggedError: LoggedError)
+    {
+        let baseURL = URL(string: "https://faq.altstore.io/getting-started/troubleshooting-guide")!
+        var components = URLComponents(url: baseURL, resolvingAgainstBaseURL: false)!
+        
+        let query = [loggedError.domain, "\(loggedError.code)"].joined(separator: "+")
+        components.queryItems = [URLQueryItem(name: "q", value: query)]
+        
+        let safariViewController = SFSafariViewController(url: components.url ?? baseURL)
+        safariViewController.preferredControlTintColor = .altPrimary
+        self.present(safariViewController, animated: true)
+    }
+}
+
+extension ErrorLogViewController
+{
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
+    {
+        let loggedError = self.dataSource.item(at: indexPath)
+        
+        let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
+        alertController.addAction(UIAlertAction(title: UIAlertAction.cancel.title, style: UIAlertAction.cancel.style) { _ in
+            tableView.deselectRow(at: indexPath, animated: true)
+        })
+        alertController.addAction(UIAlertAction(title: NSLocalizedString("Copy Error Message", comment: ""), style: .default) { [weak self] _ in
+            self?.copyErrorMessage(for: loggedError)
+            tableView.deselectRow(at: indexPath, animated: true)
+        })
+        alertController.addAction(UIAlertAction(title: NSLocalizedString("Copy Error Code", comment: ""), style: .default) { [weak self] _ in
+            self?.copyErrorCode(for: loggedError)
+            tableView.deselectRow(at: indexPath, animated: true)
+        })
+        alertController.addAction(UIAlertAction(title: NSLocalizedString("Search FAQ", comment: ""), style: .default) { [weak self] _ in
+            self?.searchFAQ(for: loggedError)
+            tableView.deselectRow(at: indexPath, animated: true)
+        })
+        self.present(alertController, animated: true)
+    }
+    
+    override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration?
+    {
+        let deleteAction = UIContextualAction(style: .destructive, title: NSLocalizedString("Delete", comment: "")) { _, _, completion in
+            let loggedError = self.dataSource.item(at: indexPath)
+            DatabaseManager.shared.persistentContainer.performBackgroundTask { context in
+                do
+                {
+                    let loggedError = context.object(with: loggedError.objectID) as! LoggedError
+                    context.delete(loggedError)
+                    
+                    try context.save()
+                    completion(true)
+                }
+                catch
+                {
+                    print("[ALTLog] Failed to delete LoggedError \(loggedError.objectID):", error)
+                    completion(false)
+                }
+            }
+        }
+        
+        let configuration = UISwipeActionsConfiguration(actions: [deleteAction])
+        configuration.performsFirstActionWithFullSwipe = false
+        return configuration
+    }
+    
+    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String?
+    {
+        let indexPath = IndexPath(row: 0, section: section)
+        
+        let loggedError = self.dataSource.item(at: indexPath)
+        return loggedError.localizedDateString
+    }
+}

AltStore/Settings/Settings.storyboard

@@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17503.1" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="5Rz-4h-jJ8">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="21225" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="5Rz-4h-jJ8">
     <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17502"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="21207"/>
         <capability name="Named colors" minToolsVersion="9.0"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -540,7 +541,7 @@
                                         <edgeInsets key="layoutMargins" top="8" left="30" bottom="8" right="30"/>
                                         <userDefinedRuntimeAttributes>
                                             <userDefinedRuntimeAttribute type="number" keyPath="style">
-                                                <integer key="value" value="3"/>
+                                                <integer key="value" value="2"/>
                                             </userDefinedRuntimeAttribute>
                                             <userDefinedRuntimeAttribute type="boolean" keyPath="isSelectable" value="YES"/>
                                         </userDefinedRuntimeAttributes>
@@ -548,6 +549,42 @@
                                             <segue destination="GBh-rB-juy" kind="show" identifier="showRefreshAttempts" id="K2i-nF-6qa"/>
                                         </connections>
                                     </tableViewCell>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" rowHeight="51" id="rE2-P4-OaE" customClass="InsetGroupTableViewCell" customModule="AltStore" customModuleProvider="target">
+                                        <rect key="frame" x="0.0" y="972" width="375" height="51"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="rE2-P4-OaE" id="qIT-rz-ZUb">
+                                            <rect key="frame" x="0.0" y="0.0" width="375" height="51"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" ambiguous="YES" text="View Error Log" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="PWC-OG-5jx">
+                                                    <rect key="frame" x="30" y="15.5" width="119" height="20.5"/>
+                                                    <fontDescription key="fontDescription" type="boldSystem" pointSize="17"/>
+                                                    <color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                                <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" ambiguous="YES" image="Next" translatesAutoresizingMaskIntoConstraints="NO" id="VfB-c5-5wG">
+                                                    <rect key="frame" x="327" y="16.5" width="18" height="18"/>
+                                                </imageView>
+                                            </subviews>
+                                            <constraints>
+                                                <constraint firstItem="PWC-OG-5jx" firstAttribute="leading" secondItem="qIT-rz-ZUb" secondAttribute="leadingMargin" id="BQr-Nx-fIq"/>
+                                                <constraint firstItem="PWC-OG-5jx" firstAttribute="centerY" secondItem="qIT-rz-ZUb" secondAttribute="centerY" id="IDa-ov-tmK"/>
+                                                <constraint firstAttribute="trailingMargin" secondItem="VfB-c5-5wG" secondAttribute="trailing" id="Q6c-iP-6bi"/>
+                                                <constraint firstItem="VfB-c5-5wG" firstAttribute="centerY" secondItem="qIT-rz-ZUb" secondAttribute="centerY" id="WuL-ax-fFw"/>
+                                            </constraints>
+                                        </tableViewCellContentView>
+                                        <color key="backgroundColor" white="1" alpha="0.14999999999999999" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                        <edgeInsets key="layoutMargins" top="8" left="30" bottom="8" right="30"/>
+                                        <userDefinedRuntimeAttributes>
+                                            <userDefinedRuntimeAttribute type="number" keyPath="style">
+                                                <integer key="value" value="3"/>
+                                            </userDefinedRuntimeAttribute>
+                                            <userDefinedRuntimeAttribute type="boolean" keyPath="isSelectable" value="YES"/>
+                                        </userDefinedRuntimeAttributes>
+                                        <connections>
+                                            <segue destination="g8a-Rf-zWa" kind="show" identifier="showErrorLog" id="SSW-vL-86I"/>
+                                        </connections>
+                                    </tableViewCell>
                                 </cells>
                             </tableViewSection>
                         </sections>
@@ -842,6 +879,124 @@ Settings by i cons from the Noun Project</string>
             </objects>
             <point key="canvasLocation" x="1697" y="-199"/>
         </scene>
+        <!--Error Log-->
+        <scene sceneID="Htu-2V-dbE">
+            <objects>
+                <tableViewController id="g8a-Rf-zWa" customClass="ErrorLogViewController" customModule="AltStore" customModuleProvider="target" sceneMemberID="viewController">
+                    <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="insetGrouped" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="18" sectionFooterHeight="18" id="BBn-tI-e0e">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <prototypes>
+                            <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="Cell" id="HAm-mA-O78" customClass="ErrorLogTableViewCell">
+                                <rect key="frame" x="16" y="55.5" width="343" height="107.5"/>
+                                <autoresizingMask key="autoresizingMask"/>
+                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="HAm-mA-O78" id="swa-et-rfA">
+                                    <rect key="frame" x="0.0" y="0.0" width="343" height="107.5"/>
+                                    <autoresizingMask key="autoresizingMask"/>
+                                    <subviews>
+                                        <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="mtw-JM-T70">
+                                            <rect key="frame" x="16" y="11" width="311" height="85.5"/>
+                                            <subviews>
+                                                <stackView opaque="NO" contentMode="scaleToFill" alignment="top" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="bjU-TX-4lm" userLabel="Compact">
+                                                    <rect key="frame" x="0.0" y="0.0" width="311" height="43.5"/>
+                                                    <subviews>
+                                                        <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="sDZ-ZN-NT1" customClass="AppIconImageView" customModule="AltStore" customModuleProvider="target">
+                                                            <rect key="frame" x="0.0" y="0.0" width="43" height="43"/>
+                                                            <constraints>
+                                                                <constraint firstAttribute="width" secondItem="sDZ-ZN-NT1" secondAttribute="height" multiplier="1:1" id="M8a-Wh-6wd"/>
+                                                                <constraint firstAttribute="width" constant="43" id="dgV-jc-GET"/>
+                                                            </constraints>
+                                                        </imageView>
+                                                        <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="equalSpacing" spacing="4" translatesAutoresizingMaskIntoConstraints="NO" id="82d-v0-RCp">
+                                                            <rect key="frame" x="51" y="0.0" width="260" height="39"/>
+                                                            <subviews>
+                                                                <stackView opaque="NO" contentMode="scaleToFill" distribution="equalSpacing" spacing="8" translatesAutoresizingMaskIntoConstraints="NO" id="Q2j-Tc-bp2">
+                                                                    <rect key="frame" x="0.0" y="0.0" width="260" height="18"/>
+                                                                    <subviews>
+                                                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Success" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumScaleFactor="0.5" translatesAutoresizingMaskIntoConstraints="NO" id="Na7-uj-XYZ">
+                                                                            <rect key="frame" x="0.0" y="0.0" width="60" height="18"/>
+                                                                            <fontDescription key="fontDescription" type="system" weight="semibold" pointSize="15"/>
+                                                                            <color key="textColor" systemColor="darkTextColor"/>
+                                                                            <nil key="highlightedColor"/>
+                                                                        </label>
+                                                                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" horizontalCompressionResistancePriority="751" text="Date" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="SGf-pP-RL0">
+                                                                            <rect key="frame" x="229.5" y="0.0" width="30.5" height="18"/>
+                                                                            <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                                                                            <color key="textColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                                                            <nil key="highlightedColor"/>
+                                                                        </label>
+                                                                    </subviews>
+                                                                </stackView>
+                                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Error Code" textAlignment="natural" lineBreakMode="headTruncation" baselineAdjustment="alignBaselines" minimumScaleFactor="0.5" translatesAutoresizingMaskIntoConstraints="NO" id="R5a-wv-xHd">
+                                                                    <rect key="frame" x="0.0" y="22" width="260" height="17"/>
+                                                                    <fontDescription key="fontDescription" type="system" pointSize="14"/>
+                                                                    <color key="textColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                                                                    <nil key="highlightedColor"/>
+                                                                </label>
+                                                            </subviews>
+                                                        </stackView>
+                                                    </subviews>
+                                                </stackView>
+                                                <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" scrollEnabled="NO" editable="NO" text="Error Description" textAlignment="natural" selectable="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1df-ri-hKN" customClass="CollapsingTextView" customModule="AltStore" customModuleProvider="target">
+                                                    <rect key="frame" x="0.0" y="51.5" width="311" height="34"/>
+                                                    <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                                                    <accessibility key="accessibilityConfiguration">
+                                                        <accessibilityTraits key="traits" staticText="YES"/>
+                                                        <bool key="isElement" value="NO"/>
+                                                    </accessibility>
+                                                    <color key="textColor" systemColor="labelColor"/>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="15"/>
+                                                    <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
+                                                </textView>
+                                            </subviews>
+                                        </stackView>
+                                        <button opaque="NO" contentMode="scaleToFill" showsMenuAsPrimaryAction="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="ba2-EY-tf5">
+                                            <rect key="frame" x="0.0" y="0.0" width="343" height="107.5"/>
+                                            <accessibility key="accessibilityConfiguration">
+                                                <bool key="isElement" value="NO"/>
+                                            </accessibility>
+                                            <state key="normal" title="Button"/>
+                                            <buttonConfiguration key="configuration" style="plain" title=" "/>
+                                        </button>
+                                    </subviews>
+                                    <constraints>
+                                        <constraint firstItem="ba2-EY-tf5" firstAttribute="leading" secondItem="swa-et-rfA" secondAttribute="leading" id="70b-ce-vg1"/>
+                                        <constraint firstItem="ba2-EY-tf5" firstAttribute="top" secondItem="swa-et-rfA" secondAttribute="top" id="98S-pF-R8J"/>
+                                        <constraint firstAttribute="bottomMargin" secondItem="mtw-JM-T70" secondAttribute="bottom" id="fmH-Tj-9iY"/>
+                                        <constraint firstAttribute="trailingMargin" secondItem="mtw-JM-T70" secondAttribute="trailing" id="fu1-uu-mXb"/>
+                                        <constraint firstAttribute="bottom" secondItem="ba2-EY-tf5" secondAttribute="bottom" id="kvX-B0-v1x"/>
+                                        <constraint firstAttribute="leadingMargin" secondItem="mtw-JM-T70" secondAttribute="leading" id="mIY-lM-64i"/>
+                                        <constraint firstAttribute="trailing" secondItem="ba2-EY-tf5" secondAttribute="trailing" id="qnx-qR-VAH"/>
+                                        <constraint firstAttribute="topMargin" secondItem="mtw-JM-T70" secondAttribute="top" id="wOS-QI-w47"/>
+                                    </constraints>
+                                </tableViewCellContentView>
+                                <connections>
+                                    <outlet property="appIconImageView" destination="sDZ-ZN-NT1" id="5Fb-6X-vNV"/>
+                                    <outlet property="dateLabel" destination="SGf-pP-RL0" id="jCW-Ib-QGv"/>
+                                    <outlet property="errorCodeLabel" destination="R5a-wv-xHd" id="AeF-Yh-OVe"/>
+                                    <outlet property="errorDescriptionTextView" destination="1df-ri-hKN" id="s4Z-Id-iS8"/>
+                                    <outlet property="errorFailureLabel" destination="Na7-uj-XYZ" id="c6r-XP-oIL"/>
+                                    <outlet property="menuButton" destination="ba2-EY-tf5" id="GjL-NZ-KuX"/>
+                                </connections>
+                            </tableViewCell>
+                        </prototypes>
+                        <connections>
+                            <outlet property="dataSource" destination="g8a-Rf-zWa" id="3Tb-tm-jjW"/>
+                            <outlet property="delegate" destination="g8a-Rf-zWa" id="mbI-k7-Dqq"/>
+                        </connections>
+                    </tableView>
+                    <navigationItem key="navigationItem" title="Error Log" largeTitleDisplayMode="never" id="a1p-3W-bSi">
+                        <barButtonItem key="rightBarButtonItem" systemItem="trash" id="BnQ-Eh-1gC">
+                            <connections>
+                                <action selector="clearLoggedErrors:" destination="g8a-Rf-zWa" id="faq-89-H5j"/>
+                            </connections>
+                        </barButtonItem>
+                    </navigationItem>
+                </tableViewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="rU1-TZ-TD8" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="1697" y="1774"/>
+        </scene>
     </scenes>
     <resources>
         <image name="Next" width="18" height="18"/>
@@ -852,5 +1007,11 @@ Settings by i cons from the Noun Project</string>
         <systemColor name="darkTextColor">
             <color white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
         </systemColor>
+        <systemColor name="labelColor">
+            <color red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+        </systemColor>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
     </resources>
 </document>

AltStore/Settings/SettingsViewController.swift

@@ -52,6 +52,7 @@ extension SettingsViewController
     {
         case sendFeedback
         case refreshAttempts
+        case errorLog
     }
 }
 
@@ -502,7 +503,7 @@ extension SettingsViewController
                     toastView.show(in: self)
                 }
                 
-            case .refreshAttempts: break
+            case .refreshAttempts, .errorLog: break
             }
             
         default: break

AltStoreCore/Model/DatabaseManager.swift

@@ -122,6 +122,27 @@ public extension DatabaseManager
             }
         }
     }
+    
+    func purgeLoggedErrors(before date: Date? = nil, completion: @escaping (Result<Void, Error>) -> Void)
+    {
+        self.persistentContainer.performBackgroundTask { context in
+            do
+            {
+                let predicate = date.map { NSPredicate(format: "%K <= %@", #keyPath(LoggedError.date), $0 as NSDate) }
+                
+                let loggedErrors = LoggedError.all(satisfying: predicate, in: context, requestProperties: [\.returnsObjectsAsFaults: true])
+                loggedErrors.forEach { context.delete($0) }
+                
+                try context.save()
+                
+                completion(.success(()))
+            }
+            catch
+            {
+                completion(.failure(error))
+            }
+        }
+    }
 }
 
 public extension DatabaseManager
@@ -129,10 +150,7 @@ public extension DatabaseManager
     var viewContext: NSManagedObjectContext {
         return self.persistentContainer.viewContext
     }
-}
+    
-
-public extension DatabaseManager
-{
     func activeAccount(in context: NSManagedObjectContext = DatabaseManager.shared.viewContext) -> Account?
     {
         let predicate = NSPredicate(format: "%K == YES", #keyPath(Account.isActiveAccount))