Move account files to the documents directory and out of the shared container. Issue #1784

iOS/CommonExtension/ExtensionContainersFile.swift

@@ -0,0 +1,107 @@
+//
+//  ExtensionContainersFile.swift
+//  NetNewsWire-iOS
+//
+//  Created by Maurice Parker on 2/10/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import Foundation
+import os.log
+import RSCore
+import RSParser
+import Account
+
+final class ExtensionContainersFile {
+	
+	private static var log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "extensionContainersFile")
+
+	private static var filePath: String = {
+		let appGroup = Bundle.main.object(forInfoDictionaryKey: "AppGroup") as! String
+		let containerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup)
+		return containerURL!.appendingPathComponent("extension_containers.plist").path
+	}()
+	
+	private var isDirty = false {
+		didSet {
+			queueSaveToDiskIfNeeded()
+		}
+	}
+	private let saveQueue = CoalescingQueue(name: "Save Queue", interval: 0.5)
+
+	init() {
+		if !FileManager.default.fileExists(atPath: ExtensionContainersFile.filePath) {
+			save()
+		}
+		
+		NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .UserDidAddAccount, object: nil)
+		NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .UserDidDeleteAccount, object: nil)
+		NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .AccountStateDidChange, object: nil)
+		NotificationCenter.default.addObserver(self, selector: #selector(markAsDirty), name: .ChildrenDidChange, object: nil)
+	}
+
+	/// Reads and decodes the shared plist file.
+	static func read() -> ExtensionContainers? {
+		let errorPointer: NSErrorPointer = nil
+		let fileCoordinator = NSFileCoordinator()
+		let fileURL = URL(fileURLWithPath: ExtensionContainersFile.filePath)
+		var extensionContainers: ExtensionContainers? = nil
+
+		fileCoordinator.coordinate(readingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { readURL in
+			if let fileData = try? Data(contentsOf: readURL) {
+				let decoder = PropertyListDecoder()
+				extensionContainers = try? decoder.decode(ExtensionContainers.self, from: fileData)
+			}
+		})
+		
+		if let error = errorPointer?.pointee {
+			os_log(.error, log: log, "Read from disk coordination failed: %@.", error.localizedDescription)
+		}
+
+		return extensionContainers
+	}
+	
+}
+
+private extension ExtensionContainersFile {
+
+	@objc func markAsDirty() {
+		isDirty = true
+	}
+	
+	func queueSaveToDiskIfNeeded() {
+		saveQueue.add(self, #selector(saveToDiskIfNeeded))
+	}
+
+	@objc func saveToDiskIfNeeded() {
+		if isDirty {
+			isDirty = false
+			save()
+		}
+	}
+
+	func save() {
+		let encoder = PropertyListEncoder()
+		encoder.outputFormat = .binary
+
+		let errorPointer: NSErrorPointer = nil
+		let fileCoordinator = NSFileCoordinator()
+		let fileURL = URL(fileURLWithPath: ExtensionContainersFile.filePath)
+		
+		fileCoordinator.coordinate(writingItemAt: fileURL, options: [], error: errorPointer, byAccessor: { writeURL in
+			do {
+				let extensionAccounts = AccountManager.shared.sortedActiveAccounts.map { ExtensionAccount(account: $0) }
+				let extensionContainers = ExtensionContainers(accounts: extensionAccounts)
+				let data = try encoder.encode(extensionContainers)
+				try data.write(to: writeURL)
+			} catch let error as NSError {
+				os_log(.error, log: Self.log, "Save to disk failed: %@.", error.localizedDescription)
+			}
+		})
+		
+		if let error = errorPointer?.pointee {
+			os_log(.error, log: Self.log, "Save to disk coordination failed: %@.", error.localizedDescription)
+		}
+	}
+
+}