109 lines
5.5 KiB
Swift
109 lines
5.5 KiB
Swift
//
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// NotificationService.swift
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// NotificationService
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//
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// Created by MainasuK Cirno on 2021-4-23.
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//
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import UserNotifications
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import CommonOSLog
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import CryptoKit
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import AlamofireImage
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import Base85
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import AppShared
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class NotificationService: UNNotificationServiceExtension {
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var contentHandler: ((UNNotificationContent) -> Void)?
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var bestAttemptContent: UNMutableNotificationContent?
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override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
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self.contentHandler = contentHandler
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bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
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if let bestAttemptContent = bestAttemptContent {
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// Modify the notification content here...
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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let privateKey = AppSecret.default.notificationPrivateKey
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let auth = AppSecret.default.notificationAuth
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guard let encodedPayload = bestAttemptContent.userInfo["p"] as? String else {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: invalid payload", ((#file as NSString).lastPathComponent), #line, #function)
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contentHandler(bestAttemptContent)
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return
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}
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let payload = encodedPayload.decode85()
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guard let encodedPublicKey = bestAttemptContent.userInfo["k"] as? String,
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let publicKey = NotificationService.publicKey(encodedPublicKey: encodedPublicKey) else {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: invalid public key", ((#file as NSString).lastPathComponent), #line, #function)
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contentHandler(bestAttemptContent)
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return
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}
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guard let encodedSalt = bestAttemptContent.userInfo["s"] as? String else {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: invalid salt", ((#file as NSString).lastPathComponent), #line, #function)
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contentHandler(bestAttemptContent)
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return
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}
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let salt = encodedSalt.decode85()
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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)
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return
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}
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bestAttemptContent.title = notification.title
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bestAttemptContent.subtitle = ""
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bestAttemptContent.body = notification.body
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bestAttemptContent.sound = .default
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bestAttemptContent.userInfo["plaintext"] = plaintextData
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UserDefaults.shared.notificationBadgeCount += 1
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bestAttemptContent.badge = NSNumber(integerLiteral: UserDefaults.shared.notificationBadgeCount)
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if let urlString = notification.icon, let url = URL(string: urlString) {
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let temporaryDirectoryURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("notification-attachments")
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try? FileManager.default.createDirectory(at: temporaryDirectoryURL, withIntermediateDirectories: true, attributes: nil)
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let filename = url.lastPathComponent
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let fileURL = temporaryDirectoryURL.appendingPathComponent(filename)
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ImageDownloader.default.download(URLRequest(url: url), completion: { [weak self] response in
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guard let _ = self else { return }
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switch response.result {
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case .failure(let error):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: download image %s fail: %s", ((#file as NSString).lastPathComponent), #line, #function, url.debugDescription, error.localizedDescription)
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case .success(let image):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: download image %s success", ((#file as NSString).lastPathComponent), #line, #function, url.debugDescription)
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try? image.pngData()?.write(to: fileURL)
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if let attachment = try? UNNotificationAttachment(identifier: filename, url: fileURL, options: nil) {
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bestAttemptContent.attachments = [attachment]
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}
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}
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contentHandler(bestAttemptContent)
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})
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} else {
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contentHandler(bestAttemptContent)
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}
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}
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}
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override func serviceExtensionTimeWillExpire() {
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// Called just before the extension will be terminated by the system.
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// Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
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if let contentHandler = contentHandler, let bestAttemptContent = bestAttemptContent {
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contentHandler(bestAttemptContent)
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}
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}
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}
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extension NotificationService {
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static func publicKey(encodedPublicKey: String) -> P256.KeyAgreement.PublicKey? {
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let publicKeyData = encodedPublicKey.decode85()
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return try? P256.KeyAgreement.PublicKey(x963Representation: publicKeyData)
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}
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}
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