...

1 files changed, 29 insertions, 0 deletions

diff --git a/BackEnd/Timeline/Services/BasicUserService.cs b/BackEnd/Timeline/Services/BasicUserService.cs
index fbbb6677..de0829ee 100644
--- a/BackEnd/Timeline/Services/BasicUserService.cs
+++ b/BackEnd/Timeline/Services/BasicUserService.cs
@@ -29,6 +29,14 @@ namespace Timeline.Services
         /// <exception cref="ArgumentException">Thrown when <paramref name="username"/> is of bad format.</exception>

         /// <exception cref="UserNotExistException">Thrown when the user with given username does not exist.</exception>

         Task<long> GetUserIdByUsername(string username);

+

+        /// <summary>

+        /// Get the username modified time of a user.

+        /// </summary>

+        /// <param name="userId">User id.</param>

+        /// <returns>The time.</returns>

+        /// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>

+        Task<DateTime> GetUsernameLastModifiedTime(long userId);

     }

 

     public class BasicUserService : IBasicUserService

@@ -62,5 +70,26 @@ namespace Timeline.Services
 

             return entity.Id;

         }

+

+        public async Task<DateTime> GetUsernameLastModifiedTime(long userId)

+        {

+            var entity = await _database.Users.Where(u => u.Id == userId).Select(u => new { u.UsernameChangeTime }).SingleOrDefaultAsync();

+

+            if (entity is null)

+                throw new UserNotExistException(userId);

+

+            return entity.UsernameChangeTime;

+        }

+    }

+

+    public static class BasicUserServiceExtensions

+    {

+        public static async Task ThrowIfUserNotExist(this IBasicUserService service, long userId)

+        {

+            if (!await service.CheckUserExistence(userId))

+            {

+                throw new UserNotExistException(userId);

+            }

+        }

     }

 }