AMAZON AWS How do i subscribe an endpoint to SNS topic?

Question

I'm implementing push notifications in an iOS app using Amazon SNS and Amazon Cognito services. Cognito saves tokens successfully, my app gets notified, everything's working well, but there is a thing.

Now, when still in development, I need to manually add endpoints to an SNS topic, so all subscribers can get notifications. When i'll push an update to the App Store, there will be thousands of tokens to add.

I was studying Amazon AWS documentation, but there was no clue whether it's possible to make it happen without that additional effort.

My question: is it possible to automatically subscribe an endpoint to a topic with Amazon services only?

Answer 1

There is no way to automatically subscribe an endpoint to a topic, but you can accomplish all through code.

You can directly call the Subscribe API after you have created your endpoint. Unlike other kinds of subscription, no confirmation is necessary with SNS Mobile Push.

Here is some example Objective-C code that creates an endpoint and subscribes it to a topic:

AWSSNS *sns = [AWSSNS defaultSNS];
AWSSNSCreatePlatformEndpointInput *endpointRequest = [AWSSNSCreatePlatformEndpointInput new];
endpointRequest.platformApplicationArn = MY_PLATFORM_ARN;
endpointRequest.token = MY_TOKEN;

[[[sns createPlatformEndpoint:endpointRequest] continueWithSuccessBlock:^id(AWSTask *task) {
    AWSSNSCreateEndpointResponse *response = task.result;

    AWSSNSSubscribeInput *subscribeRequest = [AWSSNSSubscribeInput new];
    subscribeRequest.endpoint = response.endpointArn;
    subscribeRequest.protocols = @"application";
    subscribeRequest.topicArn = MY_TOPIC_ARN;
    return [sns subscribe:subscribeRequest];
}] continueWithBlock:^id(BFTask *task) {
    if (task.cancelled) {
        NSLog(@"Task cancelled");
    }
    else if (task.error) {
        NSLog(@"Error occurred: [%@]", task.error);
    }
    else {
        NSLog(@"Success");
    }
    return nil;
}];

Make sure you have granted access to sns:Subscribe in your Cognito roles to allow your application to make this call.

Update 2015-07-08: Updated to reflect AWS iOS SDK 2.2.0+

Answer 2

This is the original code to subscribe an endpoint to a topic in Swift3

 func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

    //Get Token ENDPOINT
    let deviceTokenString = deviceToken.reduce("", {$0 + String(format: "%02X", $1)})

    //Create SNS Module
    let sns = AWSSNS.default()
    let request = AWSSNSCreatePlatformEndpointInput()
    request?.token = deviceTokenString

    //Send Request
    request?.platformApplicationArn = Constants.SNSDEVApplicationARN

    sns.createPlatformEndpoint(request!).continue({ (task: AWSTask!) -> AnyObject! in
        if task.error != nil {
            print("Error: \(task.error)")
        } else {

            let createEndpointResponse = task.result! as AWSSNSCreateEndpointResponse
            print("endpointArn: \(createEndpointResponse.endpointArn)")

            let subscription = Constants.SNSEndPoint //Use your own topic endpoint

            //Create Subscription request
            let subscriptionRequest = AWSSNSSubscribeInput()


              subscriptionRequest?.protocols = "application"
                subscriptionRequest?.topicArn = subscription
                subscriptionRequest?.endpoint = createEndpointResponse.endpointArn

                sns.subscribe(subscriptionRequest!).continue ({
                    (task:AWSTask) -> AnyObject! in
                    if task.error != nil
                    {
                        print("Error subscribing: \(task.error)")
                        return nil
                    }

                    print("Subscribed succesfully")

                   //Confirm subscription
                    let subscriptionConfirmInput = AWSSNSConfirmSubscriptionInput()
                    subscriptionConfirmInput?.token = createEndpointResponse.endpointArn
                    subscriptionConfirmInput?.topicArn = subscription
                    sns.confirmSubscription(subscriptionConfirmInput!).continue ({
                        (task:AWSTask) -> AnyObject! in
                        if task.error != nil
                        {
                            print("Error subscribing: \(task.error)")
                        }
                        return nil
                    })
                    return nil

                })

            }
            return nil

        })
    }