Shows source errors in SourcesViewController

AltStore.xcodeproj/project.pbxproj

@@ -127,6 +127,7 @@
 		BF4C7F2523801F0800B2556E /* AltSign.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BF9B63C5229DD44D002F0A62 /* AltSign.framework */; };
 		BF4E8456246F16D700ECCBD4 /* Bundle+AltStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF1E314122A05D4C00370A3C /* Bundle+AltStore.swift */; };
 		BF54E8212315EF0D000AE0D8 /* ALTPatreonBenefitType.m in Sources */ = {isa = PBXBuildFile; fileRef = BF54E8202315EF0D000AE0D8 /* ALTPatreonBenefitType.m */; };
+		BF56333824EC5E9A00038F00 /* SecureValueTransformer.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF56333724EC5E9A00038F00 /* SecureValueTransformer.swift */; };
 		BF56D2AA23DF88310006506D /* AppID.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF56D2A923DF88310006506D /* AppID.swift */; };
 		BF56D2AC23DF8E170006506D /* FetchAppIDsOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF56D2AB23DF8E170006506D /* FetchAppIDsOperation.swift */; };
 		BF56D2AF23DF9E310006506D /* AppIDsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF56D2AE23DF9E310006506D /* AppIDsViewController.swift */; };
@@ -136,11 +137,11 @@
 		BF58048A246A28F9008AE704 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = BF580488246A28F9008AE704 /* LaunchScreen.storyboard */; };
 		BF580496246A3CB5008AE704 /* UIColor+AltBackup.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF580495246A3CB5008AE704 /* UIColor+AltBackup.swift */; };
 		BF580498246A3D19008AE704 /* UIKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = BF580497246A3D19008AE704 /* UIKit.framework */; };
-		BF58049B246A432D008AE704 /* NSError+LocalizedFailure.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6C336124197D700034FD24 /* NSError+LocalizedFailure.swift */; };
+		BF58049B246A432D008AE704 /* NSError+AltStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6C336124197D700034FD24 /* NSError+AltStore.swift */; };
 		BF5C5FCF237DF69100EDD0C6 /* ALTPluginService.m in Sources */ = {isa = PBXBuildFile; fileRef = BF5C5FCE237DF69100EDD0C6 /* ALTPluginService.m */; };
 		BF663C4F2433ED8200DAA738 /* FileManager+DirectorySize.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF663C4E2433ED8200DAA738 /* FileManager+DirectorySize.swift */; };
 		BF6A5320246DC1B0004F59C8 /* FileManager+SharedDirectories.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6A531F246DC1B0004F59C8 /* FileManager+SharedDirectories.swift */; };
-		BF6C336224197D700034FD24 /* NSError+LocalizedFailure.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6C336124197D700034FD24 /* NSError+LocalizedFailure.swift */; };
+		BF6C336224197D700034FD24 /* NSError+AltStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6C336124197D700034FD24 /* NSError+AltStore.swift */; };
 		BF6C33652419AE310034FD24 /* AltStore4ToAltStore5.xcmappingmodel in Sources */ = {isa = PBXBuildFile; fileRef = BF6C33642419AE310034FD24 /* AltStore4ToAltStore5.xcmappingmodel */; };
 		BF6C8FAC242935ED00125131 /* NSAttributedString+Markdown.m in Sources */ = {isa = PBXBuildFile; fileRef = BF6C8FAA242935ED00125131 /* NSAttributedString+Markdown.m */; };
 		BF6C8FAE2429597900125131 /* BannerCollectionViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF6C8FAD2429597900125131 /* BannerCollectionViewCell.swift */; };
@@ -479,6 +480,7 @@
 		BF4713A422976CFC00784A2F /* openssl.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; path = openssl.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		BF54E81F2315EF0D000AE0D8 /* ALTPatreonBenefitType.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ALTPatreonBenefitType.h; sourceTree = "<group>"; };
 		BF54E8202315EF0D000AE0D8 /* ALTPatreonBenefitType.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ALTPatreonBenefitType.m; sourceTree = "<group>"; };
+		BF56333724EC5E9A00038F00 /* SecureValueTransformer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SecureValueTransformer.swift; sourceTree = "<group>"; };
 		BF56D2A823DF87570006506D /* AltStore 4.xcdatamodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcdatamodel; path = "AltStore 4.xcdatamodel"; sourceTree = "<group>"; };
 		BF56D2A923DF88310006506D /* AppID.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppID.swift; sourceTree = "<group>"; };
 		BF56D2AB23DF8E170006506D /* FetchAppIDsOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FetchAppIDsOperation.swift; sourceTree = "<group>"; };
@@ -499,7 +501,7 @@
 		BF5C5FCE237DF69100EDD0C6 /* ALTPluginService.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ALTPluginService.m; sourceTree = "<group>"; };
 		BF663C4E2433ED8200DAA738 /* FileManager+DirectorySize.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "FileManager+DirectorySize.swift"; sourceTree = "<group>"; };
 		BF6A531F246DC1B0004F59C8 /* FileManager+SharedDirectories.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "FileManager+SharedDirectories.swift"; sourceTree = "<group>"; };
-		BF6C336124197D700034FD24 /* NSError+LocalizedFailure.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSError+LocalizedFailure.swift"; sourceTree = "<group>"; };
+		BF6C336124197D700034FD24 /* NSError+AltStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSError+AltStore.swift"; sourceTree = "<group>"; };
 		BF6C33632419ADEB0034FD24 /* AltStore 5.xcdatamodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcdatamodel; path = "AltStore 5.xcdatamodel"; sourceTree = "<group>"; };
 		BF6C33642419AE310034FD24 /* AltStore4ToAltStore5.xcmappingmodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcmappingmodel; path = AltStore4ToAltStore5.xcmappingmodel; sourceTree = "<group>"; };
 		BF6C8FAA242935ED00125131 /* NSAttributedString+Markdown.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = "NSAttributedString+Markdown.m"; path = "Dependencies/MarkdownAttributedString/NSAttributedString+Markdown.m"; sourceTree = SOURCE_ROOT; };
@@ -1266,6 +1268,7 @@
 				BFBBE2DB22931B20002097FA /* AltStore.xcdatamodeld */,
 				BFB11691229322E400BB457C /* DatabaseManager.swift */,
 				BF3D64A122E8031100E9056B /* MergePolicy.swift */,
+				BF56333724EC5E9A00038F00 /* SecureValueTransformer.swift */,
 				BFE6326722A858F300F30809 /* Account.swift */,
 				BF56D2A923DF88310006506D /* AppID.swift */,
 				BF3D648722E79A3700E9056B /* AppPermission.swift */,
@@ -1291,7 +1294,7 @@
 				BF9ABA4E22DD41A9008935CF /* UIColor+Hex.swift */,
 				BFDB5B1522EE90D300F74113 /* Date+RelativeDate.swift */,
 				BFF0B6992322D7D0007A79E1 /* UIScreen+CompactHeight.swift */,
-				BF6C336124197D700034FD24 /* NSError+LocalizedFailure.swift */,
+				BF6C336124197D700034FD24 /* NSError+AltStore.swift */,
 				BF663C4E2433ED8200DAA738 /* FileManager+DirectorySize.swift */,
 				BF6A531F246DC1B0004F59C8 /* FileManager+SharedDirectories.swift */,
 				BF8CAE4D248AEABA004D6CCE /* UIDevice+Jailbreak.swift */,
@@ -2005,7 +2008,7 @@
 				BF580496246A3CB5008AE704 /* UIColor+AltBackup.swift in Sources */,
 				BF580482246A28F7008AE704 /* ViewController.swift in Sources */,
 				BF44EEF0246B08BA002A52F2 /* BackupController.swift in Sources */,
-				BF58049B246A432D008AE704 /* NSError+LocalizedFailure.swift in Sources */,
+				BF58049B246A432D008AE704 /* NSError+AltStore.swift in Sources */,
 				BF58047E246A28F7008AE704 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -2024,6 +2027,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				BFDB6A0F22AB2776007EA6D6 /* SendAppOperation.swift in Sources */,
+				BF56333824EC5E9A00038F00 /* SecureValueTransformer.swift in Sources */,
 				BFDB6A0D22AAFC1A007EA6D6 /* OperationError.swift in Sources */,
 				BF74989B23621C0700CED65F /* ForwardingNavigationController.swift in Sources */,
 				BF3D649D22E7AC1B00E9056B /* PermissionPopoverViewController.swift in Sources */,
@@ -2061,7 +2065,7 @@
 				BFF0B68E23219520007A79E1 /* PatreonViewController.swift in Sources */,
 				BFD5D6EA230CCAE5007955AB /* PatreonAccount.swift in Sources */,
 				BFE6326822A858F300F30809 /* Account.swift in Sources */,
-				BF6C336224197D700034FD24 /* NSError+LocalizedFailure.swift in Sources */,
+				BF6C336224197D700034FD24 /* NSError+AltStore.swift in Sources */,
 				BFE6326622A857C200F30809 /* Team.swift in Sources */,
 				BFD2476E2284B9A500981D42 /* AppDelegate.swift in Sources */,
 				BF41B806233423AE00C593A3 /* TabBarController.swift in Sources */,

AltStore/AppDelegate.swift

@@ -77,6 +77,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         
         ServerManager.shared.startDiscovering()
         
+        SecureValueTransformer.register()
+        
         UserDefaults.standard.registerDefaults()
         
         if UserDefaults.standard.firstLaunch == nil

AltStore/Base.lproj/Main.storyboard

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16092.1" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="wKh-xq-NuP">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16097.2" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="wKh-xq-NuP">
     <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16082.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
         <capability name="Named colors" minToolsVersion="9.0"/>
         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
@@ -38,6 +38,7 @@
                         <segue destination="faz-B4-Sub" kind="relationship" relationship="viewControllers" id="dXz-Tu-hW8"/>
                         <segue destination="3Ew-ox-i4n" kind="relationship" relationship="viewControllers" id="zii-dF-qEt"/>
                         <segue destination="p3d-dP-Swg" kind="relationship" relationship="viewControllers" id="4Nf-rL-P4c"/>
+                        <segue destination="Qo4-72-Hmr" kind="presentation" identifier="presentSources" id="Qd6-ba-dIo"/>
                     </connections>
                 </tabBarController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="HuB-VB-40B" sceneMemberID="firstResponder"/>
@@ -1004,7 +1005,7 @@ World</string>
                         </barButtonItem>
                         <barButtonItem key="rightBarButtonItem" style="done" systemItem="done" id="NQF-u2-PZv">
                             <connections>
-                                <segue destination="zjS-Nr-VTw" kind="unwind" unwindAction="unwindToBrowseViewController:" id="VFy-hV-mNV"/>
+                                <segue destination="zjS-Nr-VTw" kind="unwind" unwindAction="unwindFromSourcesViewController:" id="la1-dJ-UhL"/>
                             </connections>
                         </barButtonItem>
                     </navigationItem>
@@ -1034,6 +1035,7 @@ World</string>
         </scene>
     </scenes>
     <inferredMetricsTieBreakers>
+        <segue reference="Qd6-ba-dIo"/>
         <segue reference="cnd-KK-o60"/>
     </inferredMetricsTieBreakers>
     <color key="tintColor" name="Primary"/>
@@ -1044,7 +1046,7 @@ World</string>
         <image name="News" width="19" height="20"/>
         <image name="Settings" width="20" height="20"/>
         <namedColor name="Background">
-            <color red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.0040000001899898052" green="0.50199997425079346" blue="0.51800000667572021" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </namedColor>
         <namedColor name="BlurTint">
             <color red="1" green="1" blue="1" alpha="0.30000001192092896" colorSpace="custom" customColorSpace="sRGB"/>

AltStore/Browse/BrowseViewController.swift

@@ -59,7 +59,7 @@ class BrowseViewController: UICollectionViewController
         self.updateDataSource()
     }
     
-    @IBAction private func unwindToBrowseViewController(_ segue: UIStoryboardSegue)
+    @IBAction private func unwindFromSourcesViewController(_ segue: UIStoryboardSegue)
     {
         self.fetchSource()
     }
@@ -199,6 +199,7 @@ private extension BrowseViewController
                     if self.dataSource.itemCount > 0
                     {
                         let toastView = ToastView(error: error)
+                        toastView.addTarget(nil, action: #selector(TabBarController.presentSources), for: .touchUpInside)
                         toastView.show(in: self)
                     }
                     

AltStore/Components/BannerCollectionViewCell.swift

@@ -10,7 +10,8 @@ import UIKit
 
 class BannerCollectionViewCell: UICollectionViewCell
 {
-    @IBOutlet var bannerView: AppBannerView!
+    private(set) var errorBadge: UIView?
+    @IBOutlet private(set) var bannerView: AppBannerView!
     
     override func awakeFromNib()
     {
@@ -18,5 +19,36 @@ class BannerCollectionViewCell: UICollectionViewCell
         
         self.contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
         self.contentView.preservesSuperviewLayoutMargins = true
+        
+        if #available(iOS 13.0, *)
+        {
+            let errorBadge = UIView()
+            errorBadge.translatesAutoresizingMaskIntoConstraints = false
+            errorBadge.isHidden = true
+            self.addSubview(errorBadge)
+            
+            // Solid background to make the X opaque white.
+            let backgroundView = UIView()
+            backgroundView.translatesAutoresizingMaskIntoConstraints = false
+            backgroundView.backgroundColor = .white
+            errorBadge.addSubview(backgroundView)
+                        
+            let badgeView = UIImageView(image: UIImage(systemName: "exclamationmark.circle.fill"))
+            badgeView.preferredSymbolConfiguration = UIImage.SymbolConfiguration(scale: .large)
+            badgeView.tintColor = .systemRed
+            errorBadge.addSubview(badgeView, pinningEdgesWith: .zero)
+            
+            NSLayoutConstraint.activate([
+                errorBadge.centerXAnchor.constraint(equalTo: self.bannerView.trailingAnchor, constant: -5),
+                errorBadge.centerYAnchor.constraint(equalTo: self.bannerView.topAnchor, constant: 5),
+                
+                backgroundView.centerXAnchor.constraint(equalTo: badgeView.centerXAnchor),
+                backgroundView.centerYAnchor.constraint(equalTo: badgeView.centerYAnchor),
+                backgroundView.widthAnchor.constraint(equalTo: badgeView.widthAnchor, multiplier: 0.5),
+                backgroundView.heightAnchor.constraint(equalTo: badgeView.heightAnchor, multiplier: 0.5)
+            ])
+            
+            self.errorBadge = errorBadge
+        }
     }
 }

AltStore/Extensions/NSError+AltStore.swift

@@ -1,5 +1,5 @@
 //
-//  NSError+LocalizedFailure.swift
+//  NSError+AltStore.swift
 //  AltStore
 //
 //  Created by Riley Testut on 3/11/20.
@@ -27,6 +27,21 @@ extension NSError
         let error = NSError(domain: self.domain, code: self.code, userInfo: userInfo)
         return error
     }
+    
+    func sanitizedForCoreData() -> NSError
+    {
+        var userInfo = self.userInfo
+        userInfo[NSLocalizedFailureErrorKey] = self.localizedFailure
+        userInfo[NSLocalizedDescriptionKey] = self.localizedDescription
+        userInfo[NSLocalizedFailureReasonErrorKey] = self.localizedFailureReason
+        userInfo[NSLocalizedRecoverySuggestionErrorKey] = self.localizedRecoverySuggestion
+        
+        // Remove non-ObjC-compliant userInfo values.
+        userInfo["NSCodingPath"] = nil
+        
+        let error = NSError(domain: self.domain, code: self.code, userInfo: userInfo)
+        return error
+    }
 }
 
 protocol ALTLocalizedError: LocalizedError, CustomNSError

AltStore/Managing Apps/AppManager.swift

@@ -220,6 +220,7 @@ extension AppManager
                     case .success(let source): fetchedSources.insert(source)
                     case .failure(let error):
                         let source = managedObjectContext.object(with: source.objectID) as! Source
+                        source.error = (error as NSError).sanitizedForCoreData()
                         errors[source] = error
                     }
                     

AltStore/Model/AltStore.xcdatamodeld/AltStore 6.xcdatamodel/contents

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16117.1" systemVersion="19D76" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19G73" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
     <entity name="Account" representedClassName="Account" syncable="YES">
         <attribute name="appleID" attributeType="String"/>
         <attribute name="firstName" attributeType="String"/>
@@ -104,6 +104,7 @@
         </uniquenessConstraints>
     </entity>
     <entity name="Source" representedClassName="Source" syncable="YES">
+        <attribute name="error" optional="YES" attributeType="Transformable" valueTransformerName="ALTSecureValueTransformer"/>
         <attribute name="identifier" attributeType="String"/>
         <attribute name="name" attributeType="String"/>
         <attribute name="sourceURL" attributeType="URI"/>
@@ -166,7 +167,7 @@
         <element name="NewsItem" positionX="-45" positionY="126" width="128" height="238"/>
         <element name="PatreonAccount" positionX="-45" positionY="117" width="128" height="105"/>
         <element name="RefreshAttempt" positionX="-45" positionY="117" width="128" height="105"/>
-        <element name="Source" positionX="-45" positionY="99" width="128" height="118"/>
+        <element name="Source" positionX="-45" positionY="99" width="128" height="133"/>
         <element name="StoreApp" positionX="-63" positionY="-18" width="128" height="343"/>
         <element name="Team" positionX="-45" positionY="81" width="128" height="148"/>
     </elements>

AltStore/Model/SecureValueTransformer.swift

@@ -0,0 +1,26 @@
+//
+//  SecureValueTransformer.swift
+//  AltStore
+//
+//  Created by Riley Testut on 8/18/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+@objc(ALTSecureValueTransformer)
+final class SecureValueTransformer: NSSecureUnarchiveFromDataTransformer
+{
+    static let name = NSValueTransformerName(rawValue: "ALTSecureValueTransformer")
+    
+    override static var allowedTopLevelClasses: [AnyClass] {
+        let allowedClasses = super.allowedTopLevelClasses + [NSError.self]
+        return allowedClasses
+    }
+    
+    public static func register()
+    {
+        let transformer = SecureValueTransformer()
+        ValueTransformer.setValueTransformer(transformer, forName: name)
+    }
+}

AltStore/Model/Source.swift

@@ -43,6 +43,8 @@ class Source: NSManagedObject, Fetchable, Decodable
     @NSManaged var identifier: String
     @NSManaged var sourceURL: URL
     
+    @NSManaged var error: NSError?
+    
     /* Non-Core Data Properties */
     var userInfo: [ALTSourceUserInfoKey: String]?
     

AltStore/News/NewsViewController.swift

@@ -99,6 +99,11 @@ class NewsViewController: UICollectionViewController
             self.collectionView.contentInset.bottom = 20
         }
     }
+    
+    @IBAction private func unwindFromSourcesViewController(_ segue: UIStoryboardSegue)
+    {
+        self.fetchSource()
+    }
 }
 
 private extension NewsViewController
@@ -198,6 +203,7 @@ private extension NewsViewController
                     if self.dataSource.itemCount > 0
                     {
                         let toastView = ToastView(error: error)
+                        toastView.addTarget(nil, action: #selector(TabBarController.presentSources), for: .touchUpInside)
                         toastView.show(in: self)
                     }
                     

AltStore/Sources/SourcesViewController.swift

@@ -53,6 +53,8 @@ private extension SourcesViewController
             cell.bannerView.subtitleLabel.text = source.sourceURL.absoluteString
             cell.bannerView.subtitleLabel.numberOfLines = 2
             
+            cell.errorBadge?.isHidden = (source.error == nil)
+            
             // Make sure refresh button is correct size.
             cell.layoutIfNeeded()
         }
@@ -98,6 +100,29 @@ private extension SourcesViewController
         
         self.present(alertController, animated: true, completion: nil)
     }
+    
+    func present(_ error: Error)
+    {
+        let nsError = error as NSError
+        let message = nsError.userInfo[NSDebugDescriptionErrorKey] as? String ?? nsError.localizedRecoverySuggestion
+        
+        let alertController = UIAlertController(title: error.localizedDescription, message: message, preferredStyle: .alert)
+        alertController.addAction(.ok)
+        self.present(alertController, animated: true, completion: nil)
+    }
+}
+
+extension SourcesViewController
+{
+    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
+    {
+        self.collectionView.deselectItem(at: indexPath, animated: true)
+        
+        let source = self.dataSource.item(at: indexPath)
+        guard let error = source.error else { return }
+        
+        self.present(error)
+    }
 }
 
 extension SourcesViewController: UICollectionViewDelegateFlowLayout
@@ -134,9 +159,13 @@ extension SourcesViewController
     override func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration?
     {
         let source = self.dataSource.item(at: indexPath)
-        guard source.identifier != Source.altStoreIdentifier else { return nil }
 
         return UIContextMenuConfiguration(identifier: indexPath as NSIndexPath, previewProvider: nil) { (suggestedActions) -> UIMenu? in
+            let viewErrorAction = UIAction(title: NSLocalizedString("View Error", comment: ""), image: UIImage(systemName: "exclamationmark.circle")) { (action) in
+                guard let error = source.error else { return }
+                self.present(error)
+            }
+            
             let deleteAction = UIAction(title: NSLocalizedString("Remove", comment: ""), image: UIImage(systemName: "trash"), attributes: [.destructive]) { (action) in
                 
                 DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
@@ -153,8 +182,20 @@ extension SourcesViewController
                     }
                 }
             }
+            
+            var actions: [UIAction] = []
+            
+            if source.error != nil
+            {
+                actions.append(viewErrorAction)
+            }
+            
+            if source.identifier != Source.altStoreIdentifier
+            {
+                actions.append(deleteAction)
+            }            
 
-            let menu = UIMenu(title: "", children: [deleteAction])
+            let menu = UIMenu(title: "", children: actions)
             return menu
         }
     }

AltStore/TabBarController.swift

@@ -30,6 +30,14 @@ class TabBarController: UITabBarController
     }
 }
 
+extension TabBarController
+{
+    @objc func presentSources(_ sender: Any)
+    {
+        self.performSegue(withIdentifier: "presentSources", sender: sender)
+    }
+}
+
 private extension TabBarController
 {
     @objc func openPatreonSettings(_ notification: Notification)