[AltStore] Refactors fetch apps logic to use Source model objects

AltStore.xcodeproj/project.pbxproj

@@ -109,7 +109,6 @@
 		BF770E5822BC3D0F002A40FE /* OperationGroup.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF770E5722BC3D0F002A40FE /* OperationGroup.swift */; };
 		BF770E6722BD57C4002A40FE /* BackgroundTaskManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF770E6622BD57C3002A40FE /* BackgroundTaskManager.swift */; };
 		BF770E6922BD57DD002A40FE /* Silence.m4a in Resources */ = {isa = PBXBuildFile; fileRef = BF770E6822BD57DD002A40FE /* Silence.m4a */; };
-		BF7B9EF322B82B1F0042C873 /* FetchAppsOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF7B9EF222B82B1F0042C873 /* FetchAppsOperation.swift */; };
 		BF8F69C222E659F700049BA1 /* AppContentViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8F69C122E659F700049BA1 /* AppContentViewController.swift */; };
 		BF8F69C422E662D300049BA1 /* AppViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8F69C322E662D300049BA1 /* AppViewController.swift */; };
 		BF9ABA4522DCFF43008935CF /* BrowseViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF9ABA4422DCFF43008935CF /* BrowseViewController.swift */; };
@@ -176,6 +175,8 @@
 		BFDB6A0B22AAEDB7007EA6D6 /* Operation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFDB6A0A22AAEDB7007EA6D6 /* Operation.swift */; };
 		BFDB6A0D22AAFC1A007EA6D6 /* OperationError.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFDB6A0C22AAFC19007EA6D6 /* OperationError.swift */; };
 		BFDB6A0F22AB2776007EA6D6 /* SendAppOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFDB6A0E22AB2776007EA6D6 /* SendAppOperation.swift */; };
+		BFE338DD22F0E7F3002E24B9 /* Source.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFE338DC22F0E7F3002E24B9 /* Source.swift */; };
+		BFE338DF22F0EADB002E24B9 /* FetchSourceOperation.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFE338DE22F0EADB002E24B9 /* FetchSourceOperation.swift */; };
 		BFE338E822F10E56002E24B9 /* LaunchViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFE338E722F10E56002E24B9 /* LaunchViewController.swift */; };
 		BFE6325A22A83BEB00F30809 /* Authentication.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = BFE6325922A83BEB00F30809 /* Authentication.storyboard */; };
 		BFE6325C22A83C0100F30809 /* AuthenticationViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = BFE6325B22A83C0100F30809 /* AuthenticationViewController.swift */; };
@@ -356,7 +357,6 @@
 		BF770E5722BC3D0F002A40FE /* OperationGroup.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OperationGroup.swift; sourceTree = "<group>"; };
 		BF770E6622BD57C3002A40FE /* BackgroundTaskManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BackgroundTaskManager.swift; sourceTree = "<group>"; };
 		BF770E6822BD57DD002A40FE /* Silence.m4a */ = {isa = PBXFileReference; lastKnownFileType = file; path = Silence.m4a; sourceTree = "<group>"; };
-		BF7B9EF222B82B1F0042C873 /* FetchAppsOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FetchAppsOperation.swift; sourceTree = "<group>"; };
 		BF8F69C122E659F700049BA1 /* AppContentViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppContentViewController.swift; sourceTree = "<group>"; };
 		BF8F69C322E662D300049BA1 /* AppViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppViewController.swift; sourceTree = "<group>"; };
 		BF9ABA4422DCFF43008935CF /* BrowseViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowseViewController.swift; sourceTree = "<group>"; };
@@ -427,6 +427,8 @@
 		BFDB6A0A22AAEDB7007EA6D6 /* Operation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Operation.swift; sourceTree = "<group>"; };
 		BFDB6A0C22AAFC19007EA6D6 /* OperationError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = OperationError.swift; sourceTree = "<group>"; };
 		BFDB6A0E22AB2776007EA6D6 /* SendAppOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SendAppOperation.swift; sourceTree = "<group>"; };
+		BFE338DC22F0E7F3002E24B9 /* Source.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Source.swift; sourceTree = "<group>"; };
+		BFE338DE22F0EADB002E24B9 /* FetchSourceOperation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FetchSourceOperation.swift; sourceTree = "<group>"; };
 		BFE338E722F10E56002E24B9 /* LaunchViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LaunchViewController.swift; sourceTree = "<group>"; };
 		BFE6325922A83BEB00F30809 /* Authentication.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = Authentication.storyboard; sourceTree = "<group>"; };
 		BFE6325B22A83C0100F30809 /* AuthenticationViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthenticationViewController.swift; sourceTree = "<group>"; };
@@ -851,6 +853,7 @@
 				BFBBE2DE22931F73002097FA /* App.swift */,
 				BF3D648722E79A3700E9056B /* AppPermission.swift */,
 				BFBBE2E022931F81002097FA /* InstalledApp.swift */,
+				BFE338DC22F0E7F3002E24B9 /* Source.swift */,
 				BFE6326522A857C100F30809 /* Team.swift */,
 			);
 			path = Model;
@@ -905,7 +908,7 @@
 				BFDB6A0722AAED73007EA6D6 /* ResignAppOperation.swift */,
 				BFDB6A0E22AB2776007EA6D6 /* SendAppOperation.swift */,
 				BF770E5022BB1CF6002A40FE /* InstallAppOperation.swift */,
-				BF7B9EF222B82B1F0042C873 /* FetchAppsOperation.swift */,
+				BFE338DE22F0EADB002E24B9 /* FetchSourceOperation.swift */,
 			);
 			path = Operations;
 			sourceTree = "<group>";
@@ -1274,7 +1277,6 @@
 			files = (
 				BFDB6A0F22AB2776007EA6D6 /* SendAppOperation.swift in Sources */,
 				BFDB6A0D22AAFC1A007EA6D6 /* OperationError.swift in Sources */,
-				BF7B9EF322B82B1F0042C873 /* FetchAppsOperation.swift in Sources */,
 				BF3D649D22E7AC1B00E9056B /* PermissionPopoverViewController.swift in Sources */,
 				BFE6325E22A8497000F30809 /* SelectTeamViewController.swift in Sources */,
 				BFD2478F2284C8F900981D42 /* Button.swift in Sources */,
@@ -1283,11 +1285,13 @@
 				BFB11692229322E400BB457C /* DatabaseManager.swift in Sources */,
 				BFC1F38D22AEE3A4003AC21A /* DownloadAppOperation.swift in Sources */,
 				BFBBE2E122931F81002097FA /* InstalledApp.swift in Sources */,
+				BFE338DF22F0EADB002E24B9 /* FetchSourceOperation.swift in Sources */,
 				BFBBE2DF22931F73002097FA /* App.swift in Sources */,
 				BF9ABA4522DCFF43008935CF /* BrowseViewController.swift in Sources */,
 				BF43002E22A714AF0051E2BC /* Keychain.swift in Sources */,
 				BF770E5422BC044E002A40FE /* AppOperationContext.swift in Sources */,
 				BFD2478C2284C4C300981D42 /* AppIconImageView.swift in Sources */,
+				BFE338DD22F0E7F3002E24B9 /* Source.swift in Sources */,
 				BF8F69C422E662D300049BA1 /* AppViewController.swift in Sources */,
 				BFE6326822A858F300F30809 /* Account.swift in Sources */,
 				BFE6326622A857C200F30809 /* Team.swift in Sources */,

AltStore/AppDelegate.swift

@@ -176,22 +176,22 @@ extension AppDelegate
                 return
             }
             
-            var fetchAppsResult: Result<[App], Error>?
+            var fetchSourceResult: Result<Source, Error>?
             var serversResult: Result<Void, Error>?
             
             let dispatchGroup = DispatchGroup()
             dispatchGroup.enter()
             dispatchGroup.enter()
             
-            AppManager.shared.fetchApps() { (result) in
+            AppManager.shared.fetchSource() { (result) in
-                fetchAppsResult = result
+                fetchSourceResult = result
                 dispatchGroup.leave()
                 
                 do
                 {
-                    let apps = try result.get()
+                    let source = try result.get()
                     
-                    guard let context = apps.first?.managedObjectContext else { return }
+                    guard let context = source.managedObjectContext else { return }
                     
                     let updatesFetchRequest = InstalledApp.updatesFetchRequest()
                     updatesFetchRequest.includesPendingChanges = true
@@ -230,13 +230,13 @@ extension AppDelegate
             }
             
             dispatchGroup.notify(queue: .main) {
-                guard let fetchAppsResult = fetchAppsResult, let serversResult = serversResult else {
+                guard let fetchSourceResult = fetchSourceResult, let serversResult = serversResult else {
                     completionHandler(.failed)
                     return
                 }
                 
                 // Call completionHandler early to improve chances of refreshing in the background again.
-                switch (fetchAppsResult, serversResult)
+                switch (fetchSourceResult, serversResult)
                 {
                 case (.success, .success): completionHandler(.newData)
                 case (.success, .failure(ConnectionError.serverNotFound)): completionHandler(.newData)

AltStore/Browse/BrowseViewController.swift

@@ -36,7 +36,7 @@ class BrowseViewController: UICollectionViewController
     {
         super.viewWillAppear(animated)
         
-        self.fetchApps()
+        self.fetchSource()
     }
     
     override func prepare(for segue: UIStoryboardSegue, sender: Any?)
@@ -57,10 +57,18 @@ private extension BrowseViewController
     func makeDataSource() -> RSTFetchedResultsCollectionViewPrefetchingDataSource<App, UIImage>
     {
         let fetchRequest = App.fetchRequest() as NSFetchRequest<App>
-        fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \App.name, ascending: false)]
+        fetchRequest.sortDescriptors = [NSSortDescriptor(keyPath: \App.sortIndex, ascending: true), NSSortDescriptor(keyPath: \App.name, ascending: true)]
-        fetchRequest.predicate = NSPredicate(format: "%K != %@", #keyPath(App.bundleIdentifier), App.altstoreAppID)
         fetchRequest.returnsObjectsAsFaults = false
         
+        if let source = Source.fetchAltStoreSource(in: DatabaseManager.shared.viewContext)
+        {
+            fetchRequest.predicate = NSPredicate(format: "%K != %@ AND %K == %@", #keyPath(App.bundleIdentifier), App.altstoreAppID, #keyPath(App.source), source)
+        }
+        else
+        {
+            fetchRequest.predicate = NSPredicate(format: "%K != %@", #keyPath(App.bundleIdentifier), App.altstoreAppID)
+        }
+        
         let dataSource = RSTFetchedResultsCollectionViewPrefetchingDataSource<App, UIImage>(fetchRequest: fetchRequest, managedObjectContext: DatabaseManager.shared.viewContext)
         dataSource.cellConfigurationHandler = { (cell, app, indexPath) in
             let cell = cell as! BrowseCollectionViewCell
@@ -98,13 +106,13 @@ private extension BrowseViewController
         return dataSource
     }
     
-    func fetchApps()
+    func fetchSource()
     {
-        AppManager.shared.fetchApps() { (result) in
+        AppManager.shared.fetchSource() { (result) in
             do
             {                
-                let apps = try result.get()
+                let source = try result.get()
-                try apps.first?.managedObjectContext?.save()
+                try source.managedObjectContext?.save()
             }
             catch
             {

AltStore/Managing Apps/AppManager.swift

@@ -16,7 +16,7 @@ import Roxas
 
 extension AppManager
 {
-    static let didFetchAppsNotification = Notification.Name("com.altstore.AppManager.didFetchApps")
+    static let didFetchSourceNotification = Notification.Name("com.altstore.AppManager.didFetchSource")
 }
 
 class AppManager
@@ -86,21 +86,27 @@ extension AppManager
 
 extension AppManager
 {
-    func fetchApps(completionHandler: @escaping (Result<[App], Error>) -> Void)
+    func fetchSource(completionHandler: @escaping (Result<Source, Error>) -> Void)
     {
-        let fetchAppsOperation = FetchAppsOperation()
+        DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
-        fetchAppsOperation.resultHandler = { (result) in
+            guard let source = Source.first(satisfying: NSPredicate(format: "%K == %@", #keyPath(Source.identifier), Source.altStoreIdentifier), in: context) else {
+                return completionHandler(.failure(OperationError.noSources))
+            }
+            
+            let fetchSourceOperation = FetchSourceOperation(sourceURL: source.sourceURL)
+            fetchSourceOperation.resultHandler = { (result) in
                 switch result
                 {
                 case .failure(let error):
                     completionHandler(.failure(error))
                     
-            case .success(let apps):
+                case .success(let source):
-                completionHandler(.success(apps))
+                    completionHandler(.success(source))
-                NotificationCenter.default.post(name: AppManager.didFetchAppsNotification, object: self)
+                    NotificationCenter.default.post(name: AppManager.didFetchSourceNotification, object: self)
                 }
             }
-        self.operationQueue.addOperation(fetchAppsOperation)
+            self.operationQueue.addOperation(fetchSourceOperation)
+        }
     }
 }
 

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

@@ -22,6 +22,7 @@
         <attribute name="name" attributeType="String" syncable="YES"/>
         <attribute name="screenshotNames" attributeType="Transformable" syncable="YES"/>
         <attribute name="size" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
+        <attribute name="sortIndex" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES" syncable="YES"/>
         <attribute name="subtitle" optional="YES" attributeType="String" syncable="YES"/>
         <attribute name="tintColor" optional="YES" attributeType="Transformable" syncable="YES"/>
         <attribute name="version" attributeType="String" syncable="YES"/>
@@ -29,6 +30,7 @@
         <attribute name="versionDescription" optional="YES" attributeType="String" syncable="YES"/>
         <relationship name="installedApp" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="InstalledApp" inverseName="storeApp" inverseEntity="InstalledApp" syncable="YES"/>
         <relationship name="permissions" toMany="YES" deletionRule="Cascade" ordered="YES" destinationEntity="AppPermission" inverseName="app" inverseEntity="AppPermission" syncable="YES"/>
+        <relationship name="source" optional="YES" maxCount="1" deletionRule="Nullify" destinationEntity="Source" inverseName="apps" inverseEntity="Source" syncable="YES"/>
         <uniquenessConstraints>
             <uniquenessConstraint>
                 <constraint value="bundleIdentifier"/>
@@ -54,6 +56,17 @@
             </uniquenessConstraint>
         </uniquenessConstraints>
     </entity>
+    <entity name="Source" representedClassName="Source" syncable="YES">
+        <attribute name="identifier" attributeType="String" syncable="YES"/>
+        <attribute name="name" attributeType="String" syncable="YES"/>
+        <attribute name="sourceURL" attributeType="URI" syncable="YES"/>
+        <relationship name="apps" toMany="YES" deletionRule="Nullify" ordered="YES" destinationEntity="App" inverseName="source" inverseEntity="App" syncable="YES"/>
+        <uniquenessConstraints>
+            <uniquenessConstraint>
+                <constraint value="identifier"/>
+            </uniquenessConstraint>
+        </uniquenessConstraints>
+    </entity>
     <entity name="Team" representedClassName="Team" syncable="YES">
         <attribute name="identifier" attributeType="String" syncable="YES"/>
         <attribute name="isActiveTeam" attributeType="Boolean" defaultValueString="NO" usesScalarValueType="YES" syncable="YES"/>
@@ -68,9 +81,10 @@
     </entity>
     <elements>
         <element name="Account" positionX="-36" positionY="90" width="128" height="135"/>
-        <element name="App" positionX="-63" positionY="-18" width="128" height="270"/>
+        <element name="App" positionX="-63" positionY="-18" width="128" height="300"/>
         <element name="AppPermission" positionX="-45" positionY="90" width="128" height="90"/>
         <element name="InstalledApp" positionX="-63" positionY="0" width="128" height="150"/>
         <element name="Team" positionX="-45" positionY="81" width="128" height="120"/>
+        <element name="Source" positionX="-45" positionY="99" width="128" height="105"/>
     </elements>
 </model>

AltStore/Model/App.swift

@@ -39,8 +39,11 @@ class App: NSManagedObject, Decodable, Fetchable
     @NSManaged private(set) var downloadURL: URL
     @NSManaged private(set) var tintColor: UIColor?
     
+    @NSManaged var sortIndex: Int32
+    
     /* Relationships */
     @NSManaged var installedApp: InstalledApp?
+    @NSManaged var source: Source?
     @objc(permissions) @NSManaged var _permissions: NSOrderedSet
     
     @nonobjc var permissions: [AppPermission] {

AltStore/Model/DatabaseManager.swift

@@ -118,8 +118,11 @@ private extension DatabaseManager
             }
             else
             {
+                let source = Source.makeAltStoreSource(in: context)
+                
                 storeApp = App.makeAltStoreApp(in: context)
                 storeApp.version = localApp.version
+                storeApp.source = source
             }
             
             let installedApp: InstalledApp

AltStore/Model/MergePolicy.swift

@@ -30,6 +30,20 @@ open class MergePolicy: RSTRelationshipPreservingMergePolicy
                     permission.managedObjectContext?.delete(permission)
                 }
                 
+            case let databaseObject as Source:
+                guard let conflictedObject = conflict.conflictingObjects.first as? Source else { break }
+
+                let bundleIdentifiers = Set(conflictedObject.apps.map { $0.bundleIdentifier })
+
+                for app in databaseObject.apps
+                {
+                    if !bundleIdentifiers.contains(app.bundleIdentifier)
+                    {
+                        // No longer listed in Source, so remove it from database.
+                        app.managedObjectContext?.delete(app)
+                    }
+                }
+                
             default: break
             }
         }

AltStore/Model/Source.swift

@@ -0,0 +1,92 @@
+//
+//  Source.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/30/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import CoreData
+
+extension Source
+{
+    static let altStoreIdentifier = "com.rileytestut.AltStore"
+}
+
+@objc(Source)
+class Source: NSManagedObject, Fetchable, Decodable
+{
+    /* Properties */
+    @NSManaged var name: String
+    @NSManaged var identifier: String
+    @NSManaged var sourceURL: URL
+    
+    /* Relationships */
+    @objc(apps) @NSManaged private(set) var _apps: NSOrderedSet
+    
+    @nonobjc var apps: [App] {
+        get {
+            return self._apps.array as! [App]
+        }
+        set {
+            self._apps = NSOrderedSet(array: newValue)
+        }
+    }
+    
+    private enum CodingKeys: String, CodingKey
+    {
+        case name
+        case identifier
+        case sourceURL
+        case apps
+    }
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    required init(from decoder: Decoder) throws
+    {
+        guard let context = decoder.managedObjectContext else { preconditionFailure("Decoder must have non-nil NSManagedObjectContext.") }
+        
+        super.init(entity: Source.entity(), insertInto: nil)
+        
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        self.name = try container.decode(String.self, forKey: .name)
+        self.identifier = try container.decode(String.self, forKey: .identifier)
+        self.sourceURL = try container.decode(URL.self, forKey: .sourceURL)
+        
+        let apps = try container.decodeIfPresent([App].self, forKey: .apps) ?? []
+        for (index, app) in apps.enumerated()
+        {
+            app.sortIndex = Int32(index)
+        }
+        
+        context.insert(self)
+        
+        // Must assign after we're inserted into context.
+        self._apps = NSMutableOrderedSet(array: apps)
+        
+        print("Downloaded Order:", self.apps.map { $0.bundleIdentifier })
+    }
+}
+
+extension Source
+{
+    class func makeAltStoreSource(in context: NSManagedObjectContext) -> Source
+    {
+        let source = Source(context: context)
+        source.name = "AltStore"
+        source.identifier = Source.altStoreIdentifier
+        source.sourceURL = URL(string: "https://www.dropbox.com/s/6qi1vt6hsi88lv6/Apps-Dev.json?dl=1")!
+        
+        return source
+    }
+    
+    class func fetchAltStoreSource(in context: NSManagedObjectContext) -> Source?
+    {
+        let source = Source.first(satisfying: NSPredicate(format: "%K == %@", #keyPath(Source.identifier), Source.altStoreIdentifier), in: context)
+        return source
+    }
+}

AltStore/My Apps/MyAppsViewController.swift

@@ -57,7 +57,7 @@ class MyAppsViewController: UICollectionViewController
     {
         super.init(coder: aDecoder)
         
-        NotificationCenter.default.addObserver(self, selector: #selector(MyAppsViewController.didFetchApps(_:)), name: AppManager.didFetchAppsNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(MyAppsViewController.didFetchSource(_:)), name: AppManager.didFetchSourceNotification, object: nil)
     }
     
     override func viewDidLoad()
@@ -522,7 +522,7 @@ private extension MyAppsViewController
 
 private extension MyAppsViewController
 {
-    @objc func didFetchApps(_ notification: Notification)
+    @objc func didFetchSource(_ notification: Notification)
     {
         DispatchQueue.main.async {
             if self.updatesDataSource.fetchedResultsController.fetchedObjects == nil

AltStore/Operations/FetchSourceOperation.swift

@@ -1,17 +1,19 @@
 //
-//  FetchAppsOperation.swift
+//  FetchSourceOperation.swift
 //  AltStore
 //
-//  Created by Riley Testut on 6/17/19.
+//  Created by Riley Testut on 7/30/19.
 //  Copyright © 2019 Riley Testut. All rights reserved.
 //
 
 import Foundation
 import Roxas
 
-@objc(FetchAppsOperation)
+@objc(FetchSourceOperation)
-class FetchAppsOperation: ResultOperation<[App]>
+class FetchSourceOperation: ResultOperation<Source>
 {
+    let sourceURL: URL
+    
     private let session = URLSession(configuration: .default)
     
     private lazy var dateFormatter: DateFormatter = {
@@ -20,13 +22,16 @@ class FetchAppsOperation: ResultOperation<[App]>
         return dateFormatter
     }()
     
+    init(sourceURL: URL)
+    {
+        self.sourceURL = sourceURL
+    }
+    
     override func main()
     {
         super.main()
         
-        let appsURL = URL(string: "https://www.dropbox.com/s/6qi1vt6hsi88lv6/Apps-Dev.json?dl=1")!
+        let dataTask = self.session.dataTask(with: self.sourceURL) { (data, response, error) in
-        
-        let dataTask = self.session.dataTask(with: appsURL) { (data, response, error) in
             DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
                 do
                 {
@@ -36,8 +41,8 @@ class FetchAppsOperation: ResultOperation<[App]>
                     decoder.dateDecodingStrategy = .formatted(self.dateFormatter)
                     decoder.managedObjectContext = context
                     
-                    let apps = try decoder.decode([App].self, from: data)
+                    let source = try decoder.decode(Source.self, from: data)
-                    self.finish(.success(apps))
+                    self.finish(.success(source))
                 }
                 catch
                 {

AltStore/Operations/OperationError.swift

@@ -25,6 +25,8 @@ enum OperationError: LocalizedError
     
     case iOSVersionNotSupported(ALTApplication)
     
+    case noSources
+    
     var errorDescription: String? {
         switch self {
         case .unknown: return NSLocalizedString("An unknown error occured.", comment: "")
@@ -35,6 +37,7 @@ enum OperationError: LocalizedError
         case .unknownUDID: return NSLocalizedString("Unknown device UDID.", comment: "")
         case .invalidApp: return NSLocalizedString("The app is invalid.", comment: "")
         case .invalidParameters: return NSLocalizedString("Invalid parameters.", comment: "")
+        case .noSources: return NSLocalizedString("There are no AltStore sources.", comment: "")
         case .iOSVersionNotSupported(let app):
             let name = app.name
             

AltStore/Resources/Apps-Dev.json

@@ -1,4 +1,8 @@
-[
+{
+  "name": "AltStore",
+  "identifier": "com.rileytestut.AltStore",
+  "sourceURL": "https://www.dropbox.com/s/6qi1vt6hsi88lv6/Apps-Dev.json?dl=1",
+  "apps": [
     {
       "name": "AltStore",
       "bundleIdentifier": "com.rileytestut.AltStore",
@@ -43,7 +47,7 @@
       "screenshotNames": [
         "Delta1",
         "Delta2",
-      "Delta3",
+        "Delta3"
       ]
     },
     {
@@ -67,7 +71,8 @@
       ],
       "screenshotNames": [
         "Clip1",
-        "Clip2",
+        "Clip2"
       ]
     }
-]
+  ]
+}