241 lines
11 KiB
Swift
241 lines
11 KiB
Swift
// Notification categories and actions from docs/api.md, and what each action does. Allow, Deny,
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// Reply and a question's answers run in the background against the gateway; tapping a notification
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// opens its thread.
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//
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// An `input` push that carries `question` gets one button per option, plus "Say an answer" when the
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// question takes its own answer. watchOS only lets a notification's actions change per push from
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// its hosting controller, so `InputNotificationController` sets them when the push arrives. Any other
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// `input` push keeps the category's Answer and Open, which open the thread's question screen.
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import Foundation
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import SwiftUI
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import UserNotifications
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import WatchKit
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/// What a notification response asks for, parsed out of the payload.
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enum NotificationCommand: Equatable, Sendable {
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case respond(hostId: String, threadId: String, requestId: String, decision: ApprovalDecision)
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/// One answer to a push's single question: an option's value, or what was said or typed.
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case answer(hostId: String, threadId: String, requestId: String, questionId: String, value: String)
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case reply(hostId: String, threadId: String, text: String)
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case open(Route?)
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case none
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enum Action {
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static let allow = "allow"
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static let deny = "deny"
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static let reply = "reply"
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static let open = "open"
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/// Opens the thread, on a question the notification cannot answer itself.
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static let answer = "answer"
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/// A spoken or typed answer to a push's question.
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static let say = "say"
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/// `option.<n>` picks the push question's n-th option.
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static let optionPrefix = "option."
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}
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/// `userInfo` holds the custom keys `hostId`, `threadId` and, for approvals and questions,
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/// `requestId`, and for a lone single-choice question, `question`.
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init(actionIdentifier: String, userInfo: [AnyHashable: Any], text: String?) {
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// The gateway sends `threadId: ""` on host notifications, so empty means absent.
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func value(_ key: String) -> String? {
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(userInfo[key] as? String).flatMap { $0.isEmpty ? nil : $0 }
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}
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let hostId = value("hostId")
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let threadId = value("threadId")
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let requestId = value("requestId")
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let thread: Route? = if let hostId, let threadId { .thread(hostId: hostId, threadId: threadId) } else { nil }
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/// The question's answer, or the thread when the answer or the keys it needs are missing.
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func answer(_ value: String?) -> Self {
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let value = value?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
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guard let hostId, let threadId, let requestId, let question = PushQuestion(userInfo: userInfo), !value.isEmpty
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else { return .open(thread) }
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return .answer(hostId: hostId, threadId: threadId, requestId: requestId, questionId: question.id, value: value)
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}
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switch actionIdentifier {
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case Action.allow, Action.deny:
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guard let hostId, let threadId, let requestId else { self = .open(thread); return }
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self = .respond(
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hostId: hostId, threadId: threadId, requestId: requestId,
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decision: actionIdentifier == Action.allow ? .accept : .decline)
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case Action.reply:
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let text = text?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
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guard let hostId, let threadId, !text.isEmpty else { self = .open(thread); return }
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self = .reply(hostId: hostId, threadId: threadId, text: text)
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case Action.say:
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self = answer(text)
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case let id where id.hasPrefix(Action.optionPrefix):
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let index = Int(id.dropFirst(Action.optionPrefix.count))
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let options = PushQuestion(userInfo: userInfo)?.options ?? []
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self = answer(index.flatMap { options.indices.contains($0) ? options[$0].value : nil })
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case UNNotificationDismissActionIdentifier:
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self = .none
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default:
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// Open, Answer, or a tap on the notification itself.
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self = .open(thread)
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}
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}
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/// The respond route's thread and body, for Allow, Deny and a question's answer.
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var response: (hostId: String, threadId: String, request: RespondRequest)? {
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switch self {
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case let .respond(hostId, threadId, requestId, decision):
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(hostId, threadId, .decision(requestId: requestId, decision: decision))
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case let .answer(hostId, threadId, requestId, questionId, value):
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(hostId, threadId, .answers(requestId: requestId, answers: [questionId: .text(value)]))
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default:
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nil
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}
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}
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}
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@MainActor
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final class NotificationHandler: NSObject, UNUserNotificationCenterDelegate {
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static let shared = NotificationHandler()
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func install() {
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let center = UNUserNotificationCenter.current()
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center.delegate = self
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center.setNotificationCategories(Self.categories)
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}
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static var categories: Set<UNNotificationCategory> {
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typealias Action = NotificationCommand.Action
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let allow = UNNotificationAction(identifier: Action.allow, title: "Allow", options: [])
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let deny = UNNotificationAction(identifier: Action.deny, title: "Deny", options: [.destructive])
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let open = UNNotificationAction(identifier: Action.open, title: "Open", options: [.foreground])
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let reply = UNTextInputNotificationAction(
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identifier: Action.reply, title: "Reply", options: [],
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textInputButtonTitle: "Send", textInputPlaceholder: "Reply")
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let answer = UNNotificationAction(identifier: Action.answer, title: "Answer", options: [.foreground])
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func category(_ id: PushCategory, _ actions: [UNNotificationAction]) -> UNNotificationCategory {
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UNNotificationCategory(identifier: id.rawValue, actions: actions, intentIdentifiers: [], options: [])
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}
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return [
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category(.approval, [allow, deny]),
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// A question push replaces these with its options; see `inputActions`.
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category(.input, [answer, open]),
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category(.finished, [reply, open]),
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category(.failed, [open]),
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category(.host, []),
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category(.test, []),
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]
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}
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/// An `input` push's actions: its question's options, "Say an answer" when the question takes
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/// one, and Open. Without a question, Answer and Open, as the category registers them.
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static func inputActions(_ question: PushQuestion?) -> [UNNotificationAction] {
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typealias Action = NotificationCommand.Action
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let open = UNNotificationAction(identifier: Action.open, title: "Open", options: [.foreground])
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guard let question else {
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return [UNNotificationAction(identifier: Action.answer, title: "Answer", options: [.foreground]), open]
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}
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let options = question.options.enumerated().map { index, option in
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UNNotificationAction(identifier: Action.optionPrefix + String(index), title: option.label, options: [])
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}
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let say = UNTextInputNotificationAction(
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identifier: Action.say, title: "Say an answer", options: [],
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icon: UNNotificationActionIcon(systemImageName: "mic.fill"),
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textInputButtonTitle: "Send", textInputPlaceholder: "Answer")
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return options + (question.allowCustomAnswer ? [say] : []) + [open]
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}
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nonisolated func userNotificationCenter(
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_ center: UNUserNotificationCenter, willPresent notification: UNNotification
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) async -> UNNotificationPresentationOptions {
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await AppModel.shared.notificationArrived()
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return [.banner, .list, .sound]
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}
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nonisolated func userNotificationCenter(
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_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse
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) async {
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let command = NotificationCommand(
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actionIdentifier: response.actionIdentifier,
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userInfo: response.notification.request.content.userInfo,
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text: (response as? UNTextInputNotificationResponse)?.userText)
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await run(command)
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}
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private func run(_ command: NotificationCommand) async {
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let model = AppModel.shared
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switch command {
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case .none:
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return
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case let .open(route):
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if let route { model.open(route) } else { model.path = [] }
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model.reloadComplication()
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await model.refreshFeed()
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return
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case .respond, .answer:
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guard model.mode != .unpaired, let response = command.response else { return }
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await attempt("Couldn't answer") {
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try await model.api.respond(hostId: response.hostId, threadId: response.threadId, request: response.request)
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}
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case let .reply(hostId, threadId, text):
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guard model.mode != .unpaired else { return }
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await attempt("Couldn't send your reply") {
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try await model.api.sendMessage(hostId: hostId, threadId: threadId, text: text)
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}
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}
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model.reloadComplication()
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await model.refreshFeed()
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}
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/// Runs a background action. If it fails, says so with a local notification, since nothing is
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/// on screen.
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private func attempt(_ title: String, _ action: () async throws -> Void) async {
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do {
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try await action()
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} catch let error as GatewayError where error.isStale {
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return
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} catch {
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guard let message = AppModel.shared.message(for: error) else { return }
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let content = UNMutableNotificationContent()
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content.title = title
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content.body = message
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let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)
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try? await UNUserNotificationCenter.current().add(request)
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}
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}
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}
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/// The long look for `input` pushes. It shows the push's title and question, and sets the push's
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/// own actions, which is the one place watchOS takes per-push action titles.
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final class InputNotificationController: WKUserNotificationHostingController<InputNotificationView> {
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private var threadTitle = ""
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private var questionText = ""
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override var body: InputNotificationView {
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InputNotificationView(title: threadTitle, question: questionText)
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}
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override func didReceive(_ notification: UNNotification) {
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let content = notification.request.content
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threadTitle = content.title
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questionText = content.body
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notificationActions = NotificationHandler.inputActions(PushQuestion(userInfo: content.userInfo))
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}
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}
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/// The thread's title and its question, above the actions the system draws.
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struct InputNotificationView: View {
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var title: String
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var question: String
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var body: some View {
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VStack(alignment: .leading, spacing: 3) {
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Text(title)
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.font(.system(size: 15, weight: .semibold))
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Text(question)
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.font(.system(size: 13))
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.foregroundStyle(Theme.secondaryText)
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}
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.frame(maxWidth: .infinity, alignment: .leading)
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.fontDesign(.rounded)
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}
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}
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