public async Task <RegisterSuccessfulResult> RegisterSubscriberAsync(RegisterSubscriberModel model)
{
this.model = model;
DynamoSubscriber subscriber = await subscribersTableOperator.GetSubscriberAsync(model.UserId, model.Token);
// AWS SNS Mobile Push Algorithm
// Check: http://docs.aws.amazon.com/sns/latest/dg/mobile-platform-endpoint.html
bool updateNeeded = false;
bool createNeeded = (subscriber == null);
if (createNeeded)
{
subscriber = await CreateSubscriberAsync(null);
createNeeded = false;
}
// Look up the endpoint and make sure the data in it is current, even if it was just created
try
{
GetEndpointAttributesRequest geaRequest = new GetEndpointAttributesRequest();
geaRequest.EndpointArn = subscriber.EndpointARN;
GetEndpointAttributesResponse geaResponse = await snsClient.GetEndpointAttributesAsync(geaRequest);
updateNeeded = !geaResponse.Attributes["Token"].Equals(subscriber.NotificationToken) || !geaResponse.Attributes["Enabled"].Equals("true", StringComparison.OrdinalIgnoreCase);
}
catch (NotFoundException)
{
// We had a stored ARN, but the endpoint associated with it disappeared. Recreate it.
createNeeded = true;
}
if (createNeeded)
{
subscriber = await CreateSubscriberAsync(subscriber);
}
if (updateNeeded)
{
// Endpoint is out of sync with the current data. Update the token and enable it.
Dictionary <string, string> attrs = new Dictionary <string, string>();
attrs["Token"] = subscriber.NotificationToken;
attrs["Enabled"] = "true";
SetEndpointAttributesRequest seaRequest = new SetEndpointAttributesRequest();
seaRequest.Attributes = attrs;
seaRequest.EndpointArn = subscriber.EndpointARN;
await snsClient.SetEndpointAttributesAsync(seaRequest);
}
if (tagOperator.IsTaggingAvailable())
{
await tagOperator.SubscribeToTagsAsync(subscriber, model.Tags);
}
RegisterSuccessfulResult result = new RegisterSuccessfulResult();
result.EndpointArn = subscriber.EndpointARN;
return(result);
}
public DynamoSubscriber(RegisterSubscriberModel model, string endpointArn, TimeSpan?ttl)
{
this.UserId = model.UserId;
this.NotificationToken = model.Token;
this.DeviceId = model.DeviceId;
this.Platform = model.Platform;
this.EndpointARN = endpointArn;
this.UpdatedDateTime = DateTime.UtcNow;
if (ttl.HasValue)
{
this.ttl = DateTime.UtcNow.Add(ttl.Value);
}
}
