[AltStoreCore] Refactors core AltStore logic into AltStoreCore framework

AltStoreCore will contain all shared AltStore code between AltStore and any app extensions. Initially, it includes all AltStore model logic.

AltStoreCore/Model/DatabaseManager.swift

@@ -0,0 +1,273 @@
+//
+//  DatabaseManager.swift
+//  AltStore
+//
+//  Created by Riley Testut on 5/20/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import CoreData
+
+import AltSign
+import Roxas
+
+public class DatabaseManager
+{
+    public static let shared = DatabaseManager()
+    
+    public let persistentContainer: RSTPersistentContainer
+    
+    public private(set) var isStarted = false
+    
+    private var startCompletionHandlers = [(Error?) -> Void]()
+    
+    private init()
+    {
+        self.persistentContainer = RSTPersistentContainer(name: "AltStore", bundle: Bundle(for: DatabaseManager.self))
+        self.persistentContainer.preferredMergePolicy = MergePolicy()
+    }
+}
+
+public extension DatabaseManager
+{
+    func start(completionHandler: @escaping (Error?) -> Void)
+    {
+        self.startCompletionHandlers.append(completionHandler)
+        
+        guard self.startCompletionHandlers.count == 1 else { return }
+        
+        func finish(_ error: Error?)
+        {
+            self.startCompletionHandlers.forEach { $0(error) }
+            self.startCompletionHandlers.removeAll()
+        }
+        
+        guard !self.isStarted else { return finish(nil) }
+        
+        self.persistentContainer.loadPersistentStores { (description, error) in
+            guard error == nil else { return finish(error!) }
+            
+            self.prepareDatabase() { (result) in
+                switch result
+                {
+                case .failure(let error):
+                    finish(error)
+                    
+                case .success:
+                    self.isStarted = true
+                    finish(nil)
+                }
+            }
+        }
+    }
+    
+    func signOut(completionHandler: @escaping (Error?) -> Void)
+    {
+        self.persistentContainer.performBackgroundTask { (context) in
+            if let account = self.activeAccount(in: context)
+            {
+                account.isActiveAccount = false
+            }
+            
+            if let team = self.activeTeam(in: context)
+            {
+                team.isActiveTeam = false
+            }
+            
+            do
+            {
+                try context.save()
+                
+                Keychain.shared.reset()
+                
+                completionHandler(nil)
+            }
+            catch
+            {
+                print("Failed to save when signing out.", error)
+                completionHandler(error)
+            }
+        }
+    }
+}
+
+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))
+        
+        let activeAccount = Account.first(satisfying: predicate, in: context)
+        return activeAccount
+    }
+    
+    func activeTeam(in context: NSManagedObjectContext = DatabaseManager.shared.viewContext) -> Team?
+    {
+        let predicate = NSPredicate(format: "%K == YES", #keyPath(Team.isActiveTeam))
+        
+        let activeTeam = Team.first(satisfying: predicate, in: context)
+        return activeTeam
+    }
+    
+    func patreonAccount(in context: NSManagedObjectContext = DatabaseManager.shared.viewContext) -> PatreonAccount?
+    {
+        let patronAccount = PatreonAccount.first(in: context)
+        return patronAccount
+    }
+}
+
+private extension DatabaseManager
+{
+    func prepareDatabase(completionHandler: @escaping (Result<Void, Error>) -> Void)
+    {
+        let context = self.persistentContainer.newBackgroundContext()
+        context.performAndWait {
+            guard let localApp = ALTApplication(fileURL: Bundle.main.bundleURL) else { return }
+            
+            let altStoreSource: Source
+            
+            if let source = Source.first(satisfying: NSPredicate(format: "%K == %@", #keyPath(Source.identifier), Source.altStoreIdentifier), in: context)
+            {
+                altStoreSource = source
+            }
+            else
+            {
+                altStoreSource = Source.makeAltStoreSource(in: context)
+            }
+            
+            // Make sure to always update source URL to be current.
+            altStoreSource.sourceURL = Source.altStoreSourceURL
+            
+            let storeApp: StoreApp
+            
+            if let app = StoreApp.first(satisfying: NSPredicate(format: "%K == %@", #keyPath(StoreApp.bundleIdentifier), StoreApp.altstoreAppID), in: context)
+            {
+                storeApp = app
+            }
+            else
+            {
+                storeApp = StoreApp.makeAltStoreApp(in: context)
+                storeApp.version = localApp.version
+                storeApp.source = altStoreSource
+            }
+                        
+            let serialNumber = Bundle.main.object(forInfoDictionaryKey: Bundle.Info.certificateID) as? String
+            let installedApp: InstalledApp
+            
+            if let app = storeApp.installedApp
+            {
+                installedApp = app
+            }
+            else
+            {
+                installedApp = InstalledApp(resignedApp: localApp, originalBundleIdentifier: StoreApp.altstoreAppID, certificateSerialNumber: serialNumber, context: context)
+                installedApp.storeApp = storeApp
+            }
+            
+            /* App Extensions */
+            var installedExtensions = Set<InstalledExtension>()
+            
+            for appExtension in localApp.appExtensions
+            {
+                let resignedBundleID = appExtension.bundleIdentifier
+                let originalBundleID = resignedBundleID.replacingOccurrences(of: localApp.bundleIdentifier, with: StoreApp.altstoreAppID)
+                
+                let installedExtension: InstalledExtension
+                
+                if let appExtension = installedApp.appExtensions.first(where: { $0.bundleIdentifier == originalBundleID })
+                {
+                    installedExtension = appExtension
+                }
+                else
+                {
+                    installedExtension = InstalledExtension(resignedAppExtension: appExtension, originalBundleIdentifier: originalBundleID, context: context)
+                }
+                
+                installedExtension.update(resignedAppExtension: appExtension)
+                
+                installedExtensions.insert(installedExtension)
+            }
+            
+            installedApp.appExtensions = installedExtensions
+            
+            let fileURL = installedApp.fileURL
+            
+            #if DEBUG
+            let replaceCachedApp = true
+            #else
+            let replaceCachedApp = !FileManager.default.fileExists(atPath: fileURL.path) || installedApp.version != localApp.version
+            #endif
+            
+            if replaceCachedApp
+            {
+                func update(_ bundle: Bundle, bundleID: String) throws
+                {
+                    let infoPlistURL = bundle.bundleURL.appendingPathComponent("Info.plist")
+                    
+                    guard var infoDictionary = bundle.completeInfoDictionary else { throw ALTError(.missingInfoPlist) }
+                    infoDictionary[kCFBundleIdentifierKey as String] = bundleID
+                    try (infoDictionary as NSDictionary).write(to: infoPlistURL)
+                }
+                
+                FileManager.default.prepareTemporaryURL() { (temporaryFileURL) in
+                    do
+                    {
+                        try FileManager.default.copyItem(at: Bundle.main.bundleURL, to: temporaryFileURL)
+                        
+                        guard let appBundle = Bundle(url: temporaryFileURL) else { throw ALTError(.invalidApp) }
+                        try update(appBundle, bundleID: StoreApp.altstoreAppID)
+                        
+                        if let tempApp = ALTApplication(fileURL: temporaryFileURL)
+                        {
+                            for appExtension in tempApp.appExtensions
+                            {
+                                guard let extensionBundle = Bundle(url: appExtension.fileURL) else { throw ALTError(.invalidApp) }
+                                guard let installedExtension = installedExtensions.first(where: { $0.resignedBundleIdentifier == appExtension.bundleIdentifier }) else { throw ALTError(.invalidApp) }
+                                try update(extensionBundle, bundleID: installedExtension.bundleIdentifier)
+                            }
+                        }
+                        
+                        try FileManager.default.copyItem(at: temporaryFileURL, to: fileURL, shouldReplace: true)
+                    }
+                    catch
+                    {
+                        print("Failed to copy AltStore app bundle to its proper location.", error)
+                    }
+                }
+            }
+            
+            let cachedRefreshedDate = installedApp.refreshedDate
+            let cachedExpirationDate = installedApp.expirationDate
+                        
+            // Must go after comparing versions to see if we need to update our cached AltStore app bundle.
+            installedApp.update(resignedApp: localApp, certificateSerialNumber: serialNumber)
+            
+            if installedApp.refreshedDate < cachedRefreshedDate
+            {
+                // Embedded provisioning profile has a creation date older than our refreshed date.
+                // This most likely means we've refreshed the app since then, and profile is now outdated,
+                // so use cached dates instead (i.e. not the dates updated from provisioning profile).
+                
+                installedApp.refreshedDate = cachedRefreshedDate
+                installedApp.expirationDate = cachedExpirationDate
+            }
+            
+            do
+            {
+                try context.save()
+                completionHandler(.success(()))
+            }
+            catch
+            {
+                completionHandler(.failure(error))
+            }
+        }
+    }
+}