Created
October 27, 2017 00:26
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An ASP.NET Api Controller for Azure Event Grid Webhooks
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| using Newtonsoft.Json.Linq; | |
| using System; | |
| using System.Net; | |
| using System.Net.Http; | |
| using System.Threading.Tasks; | |
| using System.Web.Http; | |
| namespace MyApp.Api.Controllers | |
| { | |
| public class EventsController : ApiController | |
| { | |
| public EventsController(){} | |
| public async Task<HttpResponseMessage> Post([FromBody]dynamic e) | |
| { | |
| // WARNING - this endpoint needs to be protected by a secret key. | |
| // the key should be included as a URL parameter i.e. http://<endpoint>/api/events?key=YOUR_SECRET_KEY | |
| // this code is for registering the webhook by returning a validation code | |
| // I know, it looks weird, iterating though a dynamic -- its because of the structure of the body | |
| // https://docs.microsoft.com/en-us/azure/event-grid/security-authentication | |
| foreach ( var azEvent in e) | |
| { | |
| if (azEvent?.data?.validationCode != null) | |
| { | |
| // return the validation code to prove we own this server | |
| // this code will only be called once, when the event subscription occurs. | |
| // if this code is removed, then the subscription creation will fail | |
| return Request.CreateResponse(HttpStatusCode.OK, new { validationResponse = x.data.validationCode }); | |
| } | |
| else | |
| { | |
| var jObj = azEvent as JObject; // cast as JObject | |
| var azE = jObj.ToObject<AzureEvent>(); // cast to Azure Event | |
| if (azE != null) await HandleEvent(azE); | |
| } | |
| } | |
| return Request.CreateResponse(HttpStatusCode.OK); | |
| } | |
| private async Task HandleEvent(AzureEvent azE) | |
| { | |
| // handle the event here. | |
| // You should probably use Task.Factory.StartNew(...) so that we return from the controller method asap | |
| } | |
| // the structure of an Event | |
| public class AzureEvent | |
| { | |
| public string id { get; set; } | |
| public string topic { get; set; } | |
| public string subject { get; set; } | |
| public dynamic data { get; set; } | |
| public string eventType { get; set; } | |
| public DateTime eventTime { get; set; } | |
| } | |
| } | |
| } |
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