[FA-55] User service should be done

FictionArchive.Service.UserService/Models/IntegrationEvents/UserInvitedEvent.cs

@@ -0,0 +1,17 @@
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.UserService.Models.IntegrationEvents;
+
+public class UserInvitedEvent : IIntegrationEvent
+{
+    // Invited user info
+    public Guid InvitedUserId { get; set; }
+    public required string InvitedUsername { get; set; }
+    public required string InvitedEmail { get; set; }
+    public required string InvitedOAuthProviderId { get; set; }
+
+    // Inviter info
+    public Guid InviterId { get; set; }
+    public required string InviterUsername { get; set; }
+    public required string InviterOAuthProviderId { get; set; }
+}

FictionArchive.Service.UserService/Services/UserManagementService.cs

@@ -1,4 +1,6 @@
+using FictionArchive.Service.Shared.Services.EventBus;
 using FictionArchive.Service.UserService.Models.Database;
+using FictionArchive.Service.UserService.Models.IntegrationEvents;
 using FictionArchive.Service.UserService.Services.AuthenticationClient;
 using Microsoft.EntityFrameworkCore;
 
@@ -9,15 +11,18 @@ public class UserManagementService
     private readonly ILogger<UserManagementService> _logger;
     private readonly UserServiceDbContext _dbContext;
     private readonly IAuthenticationServiceClient _authClient;
+    private readonly IEventBus _eventBus;
 
     public UserManagementService(
         UserServiceDbContext dbContext,
         ILogger<UserManagementService> logger,
-        IAuthenticationServiceClient authClient)
+        IAuthenticationServiceClient authClient,
+        IEventBus eventBus)
     {
         _dbContext = dbContext;
         _logger = logger;
         _authClient = authClient;
+        _eventBus = eventBus;
     }
 
     /// <summary>
@@ -94,6 +99,17 @@ public class UserManagementService
 
         await _dbContext.SaveChangesAsync();
 
+        await _eventBus.Publish(new UserInvitedEvent
+        {
+            InvitedUserId = newUser.Id,
+            InvitedUsername = newUser.Username,
+            InvitedEmail = newUser.Email,
+            InvitedOAuthProviderId = newUser.OAuthProviderId,
+            InviterId = inviter.Id,
+            InviterUsername = inviter.Username,
+            InviterOAuthProviderId = inviter.OAuthProviderId
+        });
+
         _logger.LogInformation(
             "User {Username} was successfully invited by {InviterId}. New user id: {NewUserId}",
             username, inviter.Id, newUser.Id);