IceCubesApp/IceCubesNotifications/NotificationService.swift

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Swift
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import AppAccount
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import CryptoKit
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import Env
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import Intents
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import KeychainSwift
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import Models
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import Network
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import Notifications
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import UIKit
import UserNotifications
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@MainActor
class NotificationService: UNNotificationServiceExtension {
var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?
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override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
self.contentHandler = contentHandler
bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
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if var bestAttemptContent {
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let privateKey = PushNotificationsService.shared.notificationsPrivateKeyAsKey
let auth = PushNotificationsService.shared.notificationsAuthKeyAsKey
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guard let encodedPayload = bestAttemptContent.userInfo["m"] as? String,
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let payload = Data(base64Encoded: encodedPayload.URLSafeBase64ToBase64())
else {
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contentHandler(bestAttemptContent)
return
}
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guard let encodedPublicKey = bestAttemptContent.userInfo["k"] as? String,
let publicKeyData = Data(base64Encoded: encodedPublicKey.URLSafeBase64ToBase64()),
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let publicKey = try? P256.KeyAgreement.PublicKey(x963Representation: publicKeyData)
else {
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contentHandler(bestAttemptContent)
return
}
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guard let encodedSalt = bestAttemptContent.userInfo["s"] as? String,
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let salt = Data(base64Encoded: encodedSalt.URLSafeBase64ToBase64())
else {
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contentHandler(bestAttemptContent)
return
}
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guard let plaintextData = NotificationService.decrypt(payload: payload,
salt: salt,
auth: auth,
privateKey: privateKey,
publicKey: publicKey),
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let notification = try? JSONDecoder().decode(MastodonPushNotification.self, from: plaintextData)
else {
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contentHandler(bestAttemptContent)
return
}
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bestAttemptContent.title = notification.title
if AppAccountsManager.shared.availableAccounts.count > 1 {
bestAttemptContent.subtitle = bestAttemptContent.userInfo["i"] as? String ?? ""
}
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bestAttemptContent.body = notification.body.escape()
bestAttemptContent.userInfo["plaintext"] = plaintextData
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bestAttemptContent.sound = UNNotificationSound(named: UNNotificationSoundName(rawValue: "glass.caf"))
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let preferences = UserPreferences.shared
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if let token = AppAccountsManager.shared.availableAccounts.first(where: { $0.oauthToken?.accessToken == notification.accessToken })?.oauthToken {
var currentCount = preferences.getNotificationsCount(for: token)
currentCount += 1
preferences.setNotification(count: currentCount, token: token)
}
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let tokens = AppAccountsManager.shared.pushAccounts.map { $0.token }
bestAttemptContent.badge = .init(integerLiteral: preferences.getNotificationsTotalCount(for: tokens))
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if let urlString = notification.icon,
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let url = URL(string: urlString)
{
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let temporaryDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("notification-attachments")
try? FileManager.default.createDirectory(at: temporaryDirectoryURL, withIntermediateDirectories: true, attributes: nil)
let filename = url.lastPathComponent
let fileURL = temporaryDirectoryURL.appendingPathComponent(filename)
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Task {
// Warning: Non-sendable type '(any URLSessionTaskDelegate)?' exiting main actor-isolated
// context in call to non-isolated instance method 'data(for:delegate:)' cannot cross actor
// boundary.
// This is on the defaulted-to-nil second parameter of `.data(from:delegate:)`.
// There is a Radar tracking this & others like it.
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if let (data, _) = try? await URLSession.shared.data(for: .init(url: url)) {
if let image = UIImage(data: data) {
try? image.pngData()?.write(to: fileURL)
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if let remoteNotification = await toRemoteNotification(localNotification: notification),
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let type = remoteNotification.supportedType
{
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let intent = buildMessageIntent(remoteNotification: remoteNotification,
currentUser: bestAttemptContent.userInfo["i"] as? String ?? "",
avatarURL: fileURL)
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bestAttemptContent = try bestAttemptContent.updating(from: intent) as! UNMutableNotificationContent
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bestAttemptContent.threadIdentifier = remoteNotification.type
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if type == .mention {
bestAttemptContent.body = notification.body.escape()
} else {
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let newBody = "\(NSLocalizedString(type.notificationKey(), bundle: .main, comment: ""))\(notification.body.escape())"
bestAttemptContent.body = newBody
}
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} else {
if let attachment = try? UNNotificationAttachment(identifier: filename, url: fileURL, options: nil) {
bestAttemptContent.attachments = [attachment]
}
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}
}
contentHandler(bestAttemptContent)
} else {
contentHandler(bestAttemptContent)
}
}
} else {
contentHandler(bestAttemptContent)
}
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}
}
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private func toRemoteNotification(localNotification: MastodonPushNotification) async -> Models.Notification? {
do {
if let account = AppAccountsManager.shared.availableAccounts.first(where: { $0.oauthToken?.accessToken == localNotification.accessToken }) {
let client = Client(server: account.server, oauthToken: account.oauthToken)
let remoteNotification: Models.Notification = try await client.get(endpoint: Notifications.notification(id: String(localNotification.notificationID)))
return remoteNotification
}
} catch {
return nil
}
return nil
}
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private func buildMessageIntent(remoteNotification: Models.Notification,
currentUser: String,
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avatarURL: URL) -> INSendMessageIntent
{
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let handle = INPersonHandle(value: remoteNotification.account.id, type: .unknown)
let avatar = INImage(url: avatarURL)
let sender = INPerson(personHandle: handle,
nameComponents: nil,
displayName: remoteNotification.account.safeDisplayName,
image: avatar,
contactIdentifier: nil,
customIdentifier: nil)
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var recipents: [INPerson]?
var groupName: INSpeakableString?
if AppAccountsManager.shared.availableAccounts.count > 1 {
let me = INPerson(personHandle: .init(value: currentUser, type: .unknown),
nameComponents: nil,
displayName: currentUser,
image: nil,
contactIdentifier: nil,
customIdentifier: nil)
recipents = [me, sender]
groupName = .init(spokenPhrase: currentUser)
}
let intent = INSendMessageIntent(recipients: recipents,
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outgoingMessageType: .outgoingMessageText,
content: nil,
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speakableGroupName: groupName,
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conversationIdentifier: remoteNotification.account.id,
serviceName: nil,
sender: sender,
attachments: nil)
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if groupName != nil {
intent.setImage(avatar, forParameterNamed: \.speakableGroupName)
}
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return intent
}
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}