347 lines
13 KiB
Swift
347 lines
13 KiB
Swift
//
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// PushManagerImpl.swift
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// PushNotifications
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//
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// Created by Shadowfacts on 4/7/24.
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//
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import UIKit
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import UserAccounts
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import CryptoKit
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class PushManagerImpl: _PushManager {
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private let endpoint: URL
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var enabled: Bool {
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true
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}
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private var apnsEnvironment: String {
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#if DEBUG
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"development"
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#else
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"release"
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#endif
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}
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private var remoteNotificationsRegistrationContinuation: CheckedContinuation<Data, any Error>?
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private let defaults = UserDefaults(suiteName: "group.space.vaccor.Tusker")!
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private(set) var proxyRegistration: PushProxyRegistration? {
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get {
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if let dict = defaults.dictionary(forKey: "PushProxyRegistration") as? [String: String],
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let registration = PushProxyRegistration(defaultsDict: dict) {
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return registration
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} else {
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return nil
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}
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}
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set {
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defaults.setValue(newValue?.defaultsDict, forKey: "PushProxyRegistration")
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}
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}
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private(set) var subscriptions: [PushSubscription] {
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get {
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if let array = defaults.array(forKey: "PushSubscriptions") as? [[String: Any]] {
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return array.compactMap(PushSubscription.init(defaultsDict:))
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} else {
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return []
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}
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}
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set {
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defaults.setValue(newValue.map(\.defaultsDict), forKey: "PushSubscriptions")
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}
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}
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init(endpoint: URL) {
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self.endpoint = endpoint
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}
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func createSubscription(account: UserAccountInfo) throws -> PushSubscription {
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guard let proxyRegistration else {
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throw CreateSubscriptionError.notRegisteredWithProxy
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}
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if let existing = pushSubscription(account: account) {
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return existing
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}
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let key = P256.KeyAgreement.PrivateKey()
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var authSecret = Data(count: 16)
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let res = authSecret.withUnsafeMutableBytes { ptr in
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SecRandomCopyBytes(kSecRandomDefault, 16, ptr.baseAddress!)
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}
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guard res == errSecSuccess else {
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throw CreateSubscriptionError.generatingAuthSecret(res)
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}
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let subscription = PushSubscription(
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accountID: account.id,
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endpoint: endpointURL(registration: proxyRegistration, accountID: account.id),
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secretKey: key,
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authSecret: authSecret,
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alerts: [],
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policy: .all
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)
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subscriptions.append(subscription)
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return subscription
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}
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private func endpointURL(registration: PushProxyRegistration, accountID: String) -> URL {
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var endpoint = URLComponents(url: registration.endpoint, resolvingAgainstBaseURL: false)!
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endpoint.queryItems = endpoint.queryItems ?? []
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endpoint.queryItems!.append(URLQueryItem(name: "ctx", value: accountID))
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return endpoint.url!
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}
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func removeSubscription(account: UserAccountInfo) {
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subscriptions.removeAll { $0.accountID == account.id }
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}
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func updateSubscription(account: UserAccountInfo, alerts: PushSubscription.Alerts, policy: PushSubscription.Policy) {
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guard let index = subscriptions.firstIndex(where: { $0.accountID == account.id }) else {
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return
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}
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var copy = subscriptions[index]
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copy.alerts = alerts
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copy.policy = policy
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subscriptions[index] = copy
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}
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func pushSubscription(account: UserAccountInfo) -> PushSubscription? {
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subscriptions.first { $0.accountID == account.id }
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}
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func register() async throws -> PushProxyRegistration {
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guard remoteNotificationsRegistrationContinuation == nil else {
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throw PushRegistrationError.alreadyRegistering
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}
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let deviceToken = try await getDeviceToken().hexEncodedString()
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PushManager.logger.debug("Got device token: \(deviceToken)")
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let registration: PushProxyRegistration
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do {
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registration = try await register(deviceToken: deviceToken)
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PushManager.logger.debug("Got endpoint: \(registration.endpoint)")
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} catch {
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PushManager.logger.error("Proxy registration failed: \(String(describing: error))")
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throw PushRegistrationError.registeringWithProxy(error)
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}
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proxyRegistration = registration
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return registration
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}
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func unregister() async throws {
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guard let proxyRegistration else {
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return
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}
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var url = URLComponents(url: endpoint, resolvingAgainstBaseURL: false)!
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url.path = "/app/v1/registrations/\(proxyRegistration.id)"
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var request = URLRequest(url: url.url!)
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request.httpMethod = "DELETE"
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let (data, resp) = try await URLSession.shared.data(for: request)
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let status = (resp as! HTTPURLResponse).statusCode
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if (200...299).contains(status) {
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self.proxyRegistration = nil
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PushManager.logger.debug("Unregistered from proxy")
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} else {
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PushManager.logger.error("Unregistering: unexpected status \(status)")
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let error = (try? JSONDecoder().decode(ProxyRegistrationError.self, from: data)) ?? ProxyRegistrationError(error: "Unknown error", fields: nil)
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throw PushRegistrationError.unregistering(error)
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}
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}
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func updateIfNecessary(updateSubscription: @escaping (PushSubscription) async -> Bool) async {
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guard let proxyRegistration else {
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return
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}
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PushManager.logger.debug("Push proxy registration: \(proxyRegistration.id, privacy: .public)")
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do {
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let token = try await getDeviceToken().hexEncodedString()
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guard token != proxyRegistration.deviceToken else {
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// already up-to-date, nothing to do
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return
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}
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let newRegistration = try await update(registration: proxyRegistration, deviceToken: token)
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self.proxyRegistration = newRegistration
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if proxyRegistration.endpoint != newRegistration.endpoint {
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self.subscriptions = await AsyncSequenceAdaptor(wrapping: self.subscriptions).map {
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var copy = $0
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copy.endpoint = await self.endpointURL(registration: newRegistration, accountID: $0.accountID)
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if await updateSubscription(copy) {
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return copy
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} else {
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return $0
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}
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}.reduce(into: [], { partialResult, el in
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partialResult.append(el)
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})
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}
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} catch {
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PushManager.logger.error("Failed to update push registration: \(String(describing: error), privacy: .public)")
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PushManager.captureError?(error)
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}
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}
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private func getDeviceToken() async throws -> Data {
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defer {
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remoteNotificationsRegistrationContinuation = nil
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}
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return try await withCheckedThrowingContinuation { continuation in
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remoteNotificationsRegistrationContinuation = continuation
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UIApplication.shared.registerForRemoteNotifications()
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}
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}
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func didRegisterForRemoteNotifications(deviceToken: Data) {
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remoteNotificationsRegistrationContinuation?.resume(returning: deviceToken)
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}
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func didFailToRegisterForRemoteNotifications(error: any Error) {
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remoteNotificationsRegistrationContinuation?.resume(throwing: PushRegistrationError.registeringForRemoteNotifications(error))
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}
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private func register(deviceToken: String) async throws -> PushProxyRegistration {
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var url = URLComponents(url: endpoint, resolvingAgainstBaseURL: false)!
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url.path = "/app/v1/registrations"
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var request = URLRequest(url: url.url!)
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request.httpMethod = "POST"
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request.setValue("application/json", forHTTPHeaderField: "content-type")
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request.httpBody = try! JSONEncoder().encode(PushRegistrationParams(environment: apnsEnvironment, deviceToken: deviceToken, pushVersion: 1))
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let (data, resp) = try await URLSession.shared.data(for: request)
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let status = (resp as! HTTPURLResponse).statusCode
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guard (200...299).contains(status) else {
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PushManager.logger.error("Registering: unexpected status \(status)")
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let error = (try? JSONDecoder().decode(ProxyRegistrationError.self, from: data)) ?? ProxyRegistrationError(error: "Unknown error", fields: [])
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throw error
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}
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return try JSONDecoder().decode(PushProxyRegistration.self, from: data)
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}
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private func update(registration: PushProxyRegistration, deviceToken: String) async throws -> PushProxyRegistration {
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var url = URLComponents(url: endpoint, resolvingAgainstBaseURL: false)!
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url.path = "/app/v1/registrations/\(registration.id)"
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var request = URLRequest(url: url.url!)
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request.httpMethod = "PUT"
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request.setValue("application/json", forHTTPHeaderField: "content-type")
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request.httpBody = try! JSONEncoder().encode(PushUpdateParams(environment: apnsEnvironment, deviceToken: deviceToken, pushVersion: 1))
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let (data, resp) = try await URLSession.shared.data(for: request)
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let status = (resp as! HTTPURLResponse).statusCode
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guard (200...299).contains(status) else {
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PushManager.logger.error("Updating: unexpected status \(status)")
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let error = (try? JSONDecoder().decode(ProxyRegistrationError.self, from: data)) ?? ProxyRegistrationError(error: "Unknown error", fields: [])
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throw error
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}
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return try JSONDecoder().decode(PushProxyRegistration.self, from: data)
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}
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}
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enum PushRegistrationError: LocalizedError {
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case alreadyRegistering
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case registeringForRemoteNotifications(any Error)
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case registeringWithProxy(any Error)
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case unregistering(any Error)
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var errorDescription: String? {
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switch self {
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case .alreadyRegistering:
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"Already registering"
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case .registeringForRemoteNotifications(let error):
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"Remote notifications: \(error.localizedDescription)"
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case .registeringWithProxy(let error):
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"Proxy: \(error.localizedDescription)"
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case .unregistering(let error):
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"Unregistering: \(error.localizedDescription)"
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}
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}
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}
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struct ProxyRegistrationError: LocalizedError, Decodable {
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let error: String
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let fields: [Field]?
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var errorDescription: String? {
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if let fields,
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!fields.isEmpty {
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error + ": " + fields.map { "\($0.key): \($0.reason)" }.joined(separator: ", ")
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} else {
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error
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}
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}
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struct Field: Decodable {
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let key: String
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let reason: String
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}
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}
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enum CreateSubscriptionError: LocalizedError {
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case notRegisteredWithProxy
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case generatingAuthSecret(OSStatus)
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var errorDescription: String? {
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switch self {
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case .notRegisteredWithProxy:
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"Not registered with proxy"
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case .generatingAuthSecret(let code):
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"Generating auth secret: \(code)"
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}
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}
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}
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private struct PushRegistrationParams: Encodable {
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let environment: String
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let deviceToken: String
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let pushVersion: Int
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enum CodingKeys: String, CodingKey {
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case environment
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case deviceToken = "device_token"
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case pushVersion = "push_version"
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}
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}
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private struct PushUpdateParams: Encodable {
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let environment: String
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let deviceToken: String
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let pushVersion: Int
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enum CodingKeys: String, CodingKey {
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case environment
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case deviceToken = "device_token"
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case pushVersion = "push_version"
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}
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}
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private extension Data {
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func hexEncodedString() -> String {
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String(unsafeUninitializedCapacity: count * 2) { buffer in
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let chars = Array("0123456789ABCDEF".utf8)
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for (i, x) in enumerated() {
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let (upper, lower) = x.quotientAndRemainder(dividingBy: 16)
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buffer[i * 2] = chars[Int(upper)]
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buffer[i * 2 + 1] = chars[Int(lower)]
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}
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return count * 2
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}
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}
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}
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private struct AsyncSequenceAdaptor<S: Sequence>: AsyncSequence {
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typealias Element = S.Element
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let base: S
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init(wrapping base: S) {
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self.base = base
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}
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func makeAsyncIterator() -> AsyncIterator {
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AsyncIterator(base: base.makeIterator())
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}
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struct AsyncIterator: AsyncIteratorProtocol {
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var base: S.Iterator
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mutating func next() async -> Element? {
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base.next()
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}
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}
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}
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