I am currently testing the implementation of a Webhook with the Graph API but I seem to have some problems with getting the notifications. I am subscribing to calendar events of a user resource (i.e. myself) like this:
// Initialize the GraphServiceClient.
GraphServiceClient client = await MicrosoftGraphClient.GetGraphServiceClient();
//Create subscription
var request = client.Subscriptions.Request();
var subscription = new Subscription
{
ChangeType = "updated",
NotificationUrl = "https://cc3949e3.ngrok.io/Communication/Listen",
Resource = "users/b4f9f62f-0993-4288-8efa-387cff59de9d/events",
ExpirationDateTime = DateTimeOffset.Now.AddDays(1),
ClientState = "My_secreet_client_value"
};
var newSubscription = await request.AddAsync(subscription);
{
"resource": "users/b4f9f62f-0993-4288-8efa-387cff59de9d/events",
"changeType": "updated",
"clientState": "My_secreet_client_value",
"notificationUrl": "https://cc3949e3.ngrok.io/Communication/Listen",
"expirationDateTime": "2019-12-04T10:03:37.9876214+00:00",
"applicationId": "bd1f8386-f148-45ee-957d-90c18bb1a6e3",
"creatorId": "35636f28-5598-4772-9d99-19bf55de60ac",
"id": "5869875e-492c-48a6-8305-029abef6d168",
"@odata.type": "microsoft.graph.subscription",
"@odata.context": "https://graph.microsoft.com/v1.0/$metadata#subscriptions/$entity",
"responseHeaders": {
"Cache-Control": ["private"],
"Location": ["https://subscriptionstore.windows.net/1.0/subscriptions('5869875e-492c-48a6-8305-029abef6d168')"],
"request-id": ["c85fba68-803e-42ea-8cf3-a66be8f2fae7"],
"client-request-id": ["c85fba68-803e-42ea-8cf3-a66be8f2fae7"],
"x-ms-ags-diagnostic": ["{\"ServerInfo\":{\"DataCenter\":\"North Europe\",\"Slice\":\"SliceC\",\"Ring\":\"3\",\"ScaleUnit\":\"002\",\"RoleInstance\":\"AGSFE_IN_11\"}}"],
"OData-Version": ["4.0"],
"Strict-Transport-Security": ["max-age=31536000"],
"Date": ["Tue, 03 Dec 2019 10:03:42 GMT"]
},
"statusCode": "Created"
}
The response on the notification URL is handled like this:
[HttpPost("Listen")]
public async Task<IActionResult> Listen([FromQuery]string validationToken = null)
{
// handle validation
if (!string.IsNullOrEmpty(validationToken))
{
return Ok(validationToken);
}
// handle notifications
MSGraphTemplate.Models.Notifications notifications;
using (StreamReader reader = new StreamReader(Request.Body))
{
string content = reader.ReadToEnd();
notifications = JsonConvert.DeserializeObject<Notifications>(content);
[DO STUFF HERE WITH NOTIFICATIONS]
}
return Ok();
}
The token validation works fine. Also when checking the active subscriptions
// Initialize the GraphServiceClient.
GraphServiceClient client = await MicrosoftGraphClient.GetGraphServiceClient();
var subRequest = client.Subscriptions.Request();
var result = subRequest.GetAsync().Result;
return Ok(result);
it shows me the active subscription:
{
"resource": "users/b4f9f62f-0993-4288-8efa-387cff59de9d/events",
"changeType": "updated",
"notificationUrl": "https://cc3949e3.ngrok.io/Communication/Listen",
"expirationDateTime": "2019-12-04T10:08:08.7432958+00:00",
"applicationId": "bd1f8386-f148-45ee-957d-90c18bb1a6e3",
"creatorId": "35636f28-5598-4772-9d99-19bf55de60ac",
"id": "1587894f-4be3-4e58-8117-dd346059911d",
"@odata.type": "microsoft.graph.subscription"
}
But I do not get any notifications whatsoever when I am moving a calendar event in my outlook. I tried it also with 'created' and 'deleted' but without any success.
As far as I can tell, the ngrok tunnel is also working as the token validation works fine.
Any idea on how to debug/check/improve the situation?
