Is there anyway access to the subscribed Firebase themes?

Question

I'm currently trying to port the application to firebase, and I'm looking for the Firebase equivalent for Parse Installations and Channels.

What I found is that we should use themes, however, in my application, “subscribing” and “unsubscribing” to topics are common, but there is no way (which I found) to find out which topics the user has subscribed to . Any ideas?

I looked through the Firebase documentation, but I'm new to Firebase, so maybe someone with more experience will find out: https://firebase.google.com/docs/cloud-messaging/android/topic-messaging#managing_topic_subscriptions_from_the_server

Thanks in advance for your help!

Answer 1

Subscriptions for FCM topics are based on the instance ID of the application, so when you subscribe or unsubscribe to or from a topic, the IID is used.

You can use the instance API to get information about a specific IID, this information includes topics that the IID is currently subscribing to. See reference

Answer 2

You need to access the instance API. I created an extension

https://gist.github.com/eduardo22i/0ee8960c36659b17fbc538964e929cac

Message extension {

static private let accessToken = "" //Server Web Key struct Topic : Decodable { var name : String? var addDate : String? } struct Rel : Decodable { var topics = [Topic]() init(from decoder: Decoder) throws { let container = try decoder.container(keyedBy: CodingKeys.self) let relContainer = try container.nestedContainer(keyedBy: CodingKeys.self, forKey: .rel) let topicsContainer = try relContainer.nestedContainer(keyedBy: CodingKeys.self, forKey: .topics ) for key in topicsContainer.allKeys { var topic = Topic() topic.name = key.stringValue let topicContainer = try? topicsContainer.nestedContainer(keyedBy: CodingKeys.self, forKey: key) topic.addDate = try! topicContainer?.decode(String.self, forKey: .addDate) self.topics.append(topic) } } struct CodingKeys : CodingKey { var stringValue: String init?(stringValue: String) { self.stringValue = stringValue } var intValue: Int? { return nil } init?(intValue: Int) { return nil } static let rel = CodingKeys(stringValue: "rel")! static let topics = CodingKeys(stringValue: "topics")! static let addDate = CodingKeys(stringValue: "addDate")! } } func loadTopics(block : @escaping (_ topics: [Messaging.Topic]?, _ error: Error?) -> Void ) { if let token = InstanceID.instanceID().token() { let url = URL(string: "https://iid.googleapis.com/iid/info/\(token)?details=true")! var request = URLRequest(url: url) request.addValue("key=\(Messaging.accessToken)", forHTTPHeaderField: "Authorization") let dataTask = URLSession.shared.dataTask(with: request) { (data, response, error) in DataManager.shared.make(request: urlRequest, block: { (data, error) in if let data = data { let decoder = JSONDecoder() let rel = try? decoder.decode(Rel.self, from: data) block(rel?.topics, error) } else { block(nil, error) } } dataTask.resume() } } } // Usage Messaging.messaging().loadTopics { (topics, error) in topics?.forEach({ (topic) in print(topic.name) }) }