325 lines
11 KiB
Swift
325 lines
11 KiB
Swift
//
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// PushManager.swift
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// Tusker
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//
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// Created by Shadowfacts on 4/6/24.
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// Copyright © 2024 Shadowfacts. All rights reserved.
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//
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import Foundation
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import OSLog
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#if canImport(Sentry)
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import Sentry
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#endif
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private let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "PushManager")
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@MainActor
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struct PushManager {
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static let shared = createPushManager()
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private init() {}
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private static func createPushManager() -> any _PushManager {
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guard let info = Bundle.main.object(forInfoDictionaryKey: "TuskerInfo") as? [String: Any],
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let scheme = info["PushProxyScheme"] as? String,
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let host = info["PushProxyHost"] as? String,
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!scheme.isEmpty,
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!host.isEmpty else {
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logger.debug("Missing proxy info, push disabled")
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return DisabledPushManager()
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}
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var endpoint = URLComponents()
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endpoint.scheme = scheme
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endpoint.host = host
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let url = endpoint.url!
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logger.debug("Push notifications enabled with proxy \(url.absoluteString, privacy: .public)")
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return PushManagerImpl(endpoint: url)
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}
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}
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@MainActor
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protocol _PushManager {
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var enabled: Bool { get }
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var pushProxyRegistration: PushProxyRegistration? { get }
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func register(transactionID: UInt64) async throws -> PushProxyRegistration
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func unregister() async throws
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func updateIfNecessary() async
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func didRegisterForRemoteNotifications(deviceToken: Data)
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func didFailToRegisterForRemoteNotifications(error: any Error)
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}
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private class DisabledPushManager: _PushManager {
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var enabled: Bool {
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false
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}
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var pushProxyRegistration: PushProxyRegistration? {
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nil
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}
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func register(transactionID: UInt64) async throws -> PushProxyRegistration {
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throw Disabled()
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}
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func unregister() async throws {
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throw Disabled()
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}
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func updateIfNecessary() async {
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}
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func didRegisterForRemoteNotifications(deviceToken: Data) {
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}
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func didFailToRegisterForRemoteNotifications(error: any Error) {
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}
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struct Disabled: LocalizedError {
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var errorDescription: String? {
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"Push notifications disabled"
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}
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}
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}
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private 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 pushProxyRegistration: 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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init(endpoint: URL) {
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self.endpoint = endpoint
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}
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func register(transactionID: UInt64) 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()
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logger.debug("Got device token: \(deviceToken.hexEncodedString())")
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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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logger.debug("Got endpoint: \(registration.endpoint)")
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} catch {
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logger.error("Proxy registration failed: \(String(describing: error))")
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throw PushRegistrationError.registeringWithProxy(error)
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}
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pushProxyRegistration = 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 pushProxyRegistration 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/\(pushProxyRegistration.id)"
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var request = URLRequest(url: url.url!)
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request.httpMethod = "DELETE"
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let (_, 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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logger.error("Unregistering: unexpected status \(status)")
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}
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}
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func updateIfNecessary() async {
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guard let pushProxyRegistration else {
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return
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}
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logger.debug("Push proxy registration: \(pushProxyRegistration.id, privacy: .public)")
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do {
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let token = try await getDeviceToken()
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let newRegistration = try await update(registration: pushProxyRegistration, deviceToken: token)
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if pushProxyRegistration.endpoint != newRegistration.endpoint {
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// TODO: update subscriptions if the endpoint's changed
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}
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} catch {
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logger.error("Failed to update push registration: \(String(describing: error), privacy: .public)")
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#if canImport(Sentry)
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SentrySDK.capture(error: error)
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#endif
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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: Data) 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(transactionID: "TODO", environment: apnsEnvironment, deviceToken: deviceToken.hexEncodedString(), 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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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: Data) 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.hexEncodedString(), 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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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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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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}
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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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private struct PushRegistrationParams: Encodable {
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let transactionID: String
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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 transactionID = "transaction_id"
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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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struct PushProxyRegistration: Decodable {
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let id: String
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let endpoint: URL
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fileprivate var defaultsDict: [String: String] {
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[
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"id": id,
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"endpoint": endpoint.absoluteString
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]
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}
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fileprivate init?(defaultsDict: [String: String]) {
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guard let id = defaultsDict["id"],
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let endpoint = defaultsDict["endpoint"],
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let endpointURL = URL(string: endpoint) else {
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return nil
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}
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self.id = id
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self.endpoint = endpointURL
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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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