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//
// NotificationManager.swift
// MullvadVPN
//
// Created by pronebird on 31/05/2021.
// Copyright © 2021 Mullvad VPN AB. All rights reserved.
//
import Foundation
import UserNotifications
import Logging
import UIKit
protocol NotificationManagerDelegate: AnyObject {
func notificationManagerDidUpdateInAppNotifications(_ manager: NotificationManager, notifications: [InAppNotificationDescriptor])
}
fileprivate protocol NotificationProviderDelegate: AnyObject {
func notificationProviderDidInvalidate(_ notificationProvider: NotificationProvider)
}
class NotificationProvider {
fileprivate weak var delegate: NotificationProviderDelegate?
var identifier: String {
return "default"
}
func invalidate() {
let executor = { () -> Void in
self.delegate?.notificationProviderDidInvalidate(self)
}
if Thread.isMainThread {
executor()
} else {
DispatchQueue.main.async(execute: executor)
}
}
}
protocol SystemNotificationProvider {
/// Unique provider identifier used to identify requests
var identifier: String { get }
/// Notification request if available, otherwise `nil`
var notificationRequest: UNNotificationRequest? { get }
/// Whether any pending requests should be removed
var shouldRemovePendingRequests: Bool { get }
/// Whether any delivered requests should be removed
var shouldRemoveDeliveredRequests: Bool { get }
}
protocol InAppNotificationProvider {
/// Unique provider identifier used to identify notifications
var identifier: String { get }
/// In-app notification descriptor
var notificationDescriptor: InAppNotificationDescriptor? { get }
}
class NotificationManager: NotificationProviderDelegate {
private lazy var logger = Logger(label: "NotificationManager")
var notificationProviders: [NotificationProvider] = [] {
willSet {
assert(Thread.isMainThread)
}
didSet {
for notificationProvider in notificationProviders {
notificationProvider.delegate = self
}
}
}
private var inAppNotificationDescriptors: [InAppNotificationDescriptor] = []
weak var delegate: NotificationManagerDelegate? {
willSet {
assert(Thread.isMainThread)
}
didSet {
// Pump in-app notifications when changing delegate.
if !inAppNotificationDescriptors.isEmpty {
delegate?.notificationManagerDidUpdateInAppNotifications(self, notifications: inAppNotificationDescriptors)
}
}
}
func updateNotifications() {
assert(Thread.isMainThread)
var newSystemNotificationRequests = [UNNotificationRequest]()
var newInAppNotificationDescriptors = [InAppNotificationDescriptor]()
var pendingRequestIdentifiersToRemove = [String]()
var deliveredRequestIdentifiersToRemove = [String]()
for notificationProvider in notificationProviders {
if let notificationProvider = notificationProvider as? SystemNotificationProvider {
if notificationProvider.shouldRemovePendingRequests {
pendingRequestIdentifiersToRemove.append(notificationProvider.identifier)
}
if notificationProvider.shouldRemoveDeliveredRequests {
deliveredRequestIdentifiersToRemove.append(notificationProvider.identifier)
}
if let request = notificationProvider.notificationRequest {
newSystemNotificationRequests.append(request)
}
}
if let notificationProvider = notificationProvider as? InAppNotificationProvider {
if let descriptor = notificationProvider.notificationDescriptor {
newInAppNotificationDescriptors.append(descriptor)
}
}
}
let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.removePendingNotificationRequests(withIdentifiers: pendingRequestIdentifiersToRemove)
notificationCenter.removeDeliveredNotifications(withIdentifiers: deliveredRequestIdentifiersToRemove)
requestNotificationPermissions { (granted) in
guard granted else { return }
for newRequest in newSystemNotificationRequests {
notificationCenter.add(newRequest) { (error) in
if let error = error {
self.logger.error("Failed to add notification request with identifier \(newRequest.identifier). Error: \(error.localizedDescription)")
}
}
}
}
inAppNotificationDescriptors = newInAppNotificationDescriptors
delegate?.notificationManagerDidUpdateInAppNotifications(self, notifications: newInAppNotificationDescriptors)
}
// MARK: - Private
private func requestNotificationPermissions(completion: @escaping (Bool) -> Void) {
let authorizationOptions: UNAuthorizationOptions = [.alert, .sound, .provisional]
let userNotificationCenter = UNUserNotificationCenter.current()
userNotificationCenter.getNotificationSettings { (notificationSettings) in
switch notificationSettings.authorizationStatus {
case .notDetermined:
userNotificationCenter.requestAuthorization(options: authorizationOptions) { (granted, error) in
if let error = error {
self.logger.error("Failed to obtain user notifications authorization: \(error.localizedDescription)")
}
completion(granted)
}
case .authorized, .provisional:
completion(true)
case .denied, .ephemeral:
fallthrough
@unknown default:
completion(false)
}
}
}
// MARK: - NotificationProviderDelegate
func notificationProviderDidInvalidate(_ notificationProvider: NotificationProvider) {
assert(Thread.isMainThread)
// Invalidate system notification
if let notificationProvider = notificationProvider as? SystemNotificationProvider {
let notificationCenter = UNUserNotificationCenter.current()
if notificationProvider.shouldRemovePendingRequests {
notificationCenter.removePendingNotificationRequests(withIdentifiers: [notificationProvider.identifier])
}
if notificationProvider.shouldRemoveDeliveredRequests {
notificationCenter.removeDeliveredNotifications(withIdentifiers: [notificationProvider.identifier])
}
if let request = notificationProvider.notificationRequest {
requestNotificationPermissions { (granted) in
guard granted else { return }
notificationCenter.add(request) { (error) in
if let error = error {
self.logger.error("Failed to add notification request with identifier \(request.identifier). Error: \(error.localizedDescription)")
}
}
}
}
}
// Invalidate in-app notification
if let notificationProvider = notificationProvider as? InAppNotificationProvider {
var newNotificationDescriptors = inAppNotificationDescriptors
if let replaceNotificationDescriptor = notificationProvider.notificationDescriptor {
newNotificationDescriptors = notificationProviders.compactMap { (notificationProvider) -> InAppNotificationDescriptor? in
if replaceNotificationDescriptor.identifier == notificationProvider.identifier {
return replaceNotificationDescriptor
} else {
return inAppNotificationDescriptors.first { (descriptor) in
return descriptor.identifier == notificationProvider.identifier
}
}
}
} else {
newNotificationDescriptors.removeAll { (descriptor) in
return descriptor.identifier == notificationProvider.identifier
}
}
inAppNotificationDescriptors = newNotificationDescriptors
delegate?.notificationManagerDidUpdateInAppNotifications(self, notifications: inAppNotificationDescriptors)
}
}
}
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