[AltStore] Update apps from UpdatesViewController

AltStore/Operations/DownloadAppOperation.swift

@@ -45,11 +45,22 @@ class DownloadAppOperation: ResultOperation<InstalledApp>
                 DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
                     let app = context.object(with: self.app.objectID) as! App
                     
-                    let installedApp = InstalledApp(app: app,
+                    let installedApp: InstalledApp
+                    
+                    if let app = app.installedApp
+                    {
+                        installedApp = app
+                        
+                    }
+                    else
+                    {
+                        installedApp = InstalledApp(app: app,
                                                     bundleIdentifier: app.identifier,
                                                     expirationDate: Date(),
                                                     context: context)
+                    }
                     
+                    installedApp.version = app.version
                     self.finish(.success(installedApp))
                 }
             }

AltStore/Operations/FetchAppsOperation.swift

@@ -0,0 +1,53 @@
+//
+//  FetchAppsOperation.swift
+//  AltStore
+//
+//  Created by Riley Testut on 6/17/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import Roxas
+
+@objc(FetchAppsOperation)
+class FetchAppsOperation: ResultOperation<[App]>
+{
+    private let session = URLSession(configuration: .default)
+    
+    private lazy var dateFormatter: DateFormatter = {
+        let dateFormatter = DateFormatter()
+        dateFormatter.dateFormat = "yyyy-MM-dd"
+        return dateFormatter
+    }()
+    
+    override func main()
+    {
+        super.main()
+        
+        let appsURL = URL(string: "https://www.dropbox.com/s/z5tj1tx8zgeqbms/Apps.json?dl=1")!
+        
+        let dataTask = self.session.dataTask(with: appsURL) { (data, response, error) in
+            DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
+                do
+                {
+                    let (data, _) = try Result((data, response), error).get()
+                    
+                    let decoder = JSONDecoder()
+                    decoder.dateDecodingStrategy = .formatted(self.dateFormatter)
+                    decoder.managedObjectContext = context
+                    
+                    let apps = try decoder.decode([App].self, from: data)
+                    self.finish(.success(apps))
+                }
+                catch
+                {
+                    self.finish(.failure(error))
+                }
+            }
+        }
+        
+        self.progress.addChild(dataTask.progress, withPendingUnitCount: 1)
+        
+        dataTask.resume()
+    }
+}