[FA-10] Adds user service and authentication service

FictionArchive.Service.AuthenticationService/Controllers/AuthenticationWebhookController.cs

@@ -0,0 +1,36 @@
+using FictionArchive.Service.AuthenticationService.Models.Requests;
+using FictionArchive.Service.AuthenticationService.Models.IntegrationEvents;
+using FictionArchive.Service.Shared.Services.EventBus;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace FictionArchive.Service.AuthenticationService.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class AuthenticationWebhookController : ControllerBase
+    {
+        private readonly IEventBus _eventBus;
+
+        public AuthenticationWebhookController(IEventBus eventBus)
+        {
+            _eventBus = eventBus;
+        }
+
+        [HttpPost(nameof(UserRegistered))]
+        public async Task<ActionResult> UserRegistered([FromBody] UserRegisteredWebhookPayload payload)
+        {
+            var authUserAddedEvent = new AuthUserAddedEvent
+            {
+                OAuthProviderId = payload.OAuthProviderId,
+                InviterOAuthProviderId = payload.InviterOAuthProviderId,
+                EventUserEmail = payload.EventUserEmail,
+                EventUserUsername = payload.EventUserUsername
+            };
+
+            await _eventBus.Publish(authUserAddedEvent);
+
+            return Ok();
+        }
+    }
+}