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Persistence.swift
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Persistence.swift
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//
// Persistence.swift
// Shared
//
// Created by Ethan Lipnik on 8/18/21.
//
import Foundation
import CoreData
import KeychainAccess
struct PersistenceController {
static let shared = PersistenceController()
static let storeURL = URL.storeURL(for: "group.OpenSesame.ethanlipnik", databaseName: "group.OpenSesame.ethanlipnik")
static var preview: PersistenceController = {
let result = PersistenceController(inMemory: true)
let viewContext = result.container.viewContext
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
return result
}()
let container: NSPersistentCloudKitContainer
init(inMemory: Bool = false) {
container = NSPersistentCloudKitContainer(name: "OpenSesame")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
} else {
let storeDescription = NSPersistentStoreDescription(url: PersistenceController.storeURL)
let cloudkitOptions = NSPersistentCloudKitContainerOptions(containerIdentifier: "iCloud.com.ethanlipnik.OpenSesame")
storeDescription.cloudKitContainerOptions = cloudkitOptions
let remoteChangeKey = "NSPersistentStoreRemoteChangeNotificationOptionKey"
storeDescription.setOption(true as NSNumber,
forKey: remoteChangeKey)
storeDescription.setOption(true as NSNumber,
forKey: NSPersistentHistoryTrackingKey)
#if !os(macOS)
storeDescription.setOption(FileProtectionType.complete as NSObject, forKey: NSPersistentStoreFileProtectionKey)
#endif
container.persistentStoreDescriptions = [storeDescription]
print("CoreData location", PersistenceController.storeURL.path)
}
if let coreDataVersion = UserDefaults(suiteName: "group.OpenSesame.ethanlipnik")?.float(forKey: "coreDataVersion"), coreDataVersion < 1.1 {
try? FileManager.default.removeItem(at: PersistenceController.storeURL)
try? Keychain(service: "com.ethanlipnik.OpenSesame", accessGroup: "B6QG723P8Z.OpenSesame")
.synchronizable(true)
.remove("encryptionTest")
UserDefaults(suiteName: "group.OpenSesame.ethanlipnik")?.set(1.1, forKey: "coreDataVersion")
}
let viewContext = container.viewContext
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is locked.
* The device is out of space.
* The store could not be migrated to the current model version.
Check the error message to determine what the actual problem was.
*/
fatalError("Unresolved error \(error), \(error.userInfo)")
} else {
viewContext.mergePolicy = NSMergePolicy.mergeByPropertyObjectTrump
viewContext.automaticallyMergesChangesFromParent = true
try? viewContext.setQueryGenerationFrom(.current)
}
})
}
}
public extension URL {
static func storeURL(for appGroup: String, databaseName: String) -> URL {
guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup) else {
fatalError("Shared file container could not be created.")
}
return fileContainer.appendingPathComponent("\(databaseName).sqlite")
}
}