Add change username.

1 files changed, 57 insertions, 0 deletions

diff --git a/Timeline/Services/UserService.cs b/Timeline/Services/UserService.cs
index 27145683..96c3e256 100644
--- a/Timeline/Services/UserService.cs
+++ b/Timeline/Services/UserService.cs
@@ -121,6 +121,26 @@ namespace Timeline.Services
         public string Username { get; private set; }

     }

 

+

+    /// <summary>

+    /// Thrown when the user already exists.

+    /// </summary>

+    [Serializable]

+    public class UserAlreadyExistException : Exception

+    {

+        public UserAlreadyExistException(string username) : base($"User {username} already exists.") { Username = username; }

+        public UserAlreadyExistException(string username, string message) : base(message) { Username = username; }

+        public UserAlreadyExistException(string message, Exception inner) : base(message, inner) { }

+        protected UserAlreadyExistException(

+          System.Runtime.Serialization.SerializationInfo info,

+          System.Runtime.Serialization.StreamingContext context) : base(info, context) { }

+

+        /// <summary>

+        /// The username that already exists.

+        /// </summary>

+        public string Username { get; set; }

+    }

+

     public interface IUserService

     {

         /// <summary>

@@ -204,6 +224,17 @@ namespace Timeline.Services
         /// <exception cref="UserNotExistException">Thrown if the user with given username does not exist.</exception>

         /// <exception cref="BadPasswordException">Thrown if the old password is wrong.</exception>

         Task ChangePassword(string username, string oldPassword, string newPassword);

+

+        /// <summary>

+        /// Change a user's username.

+        /// </summary>

+        /// <param name="oldUsername">The user's old username.</param>

+        /// <param name="newUsername">The new username.</param>

+        /// <exception cref="ArgumentException">Thrown if <paramref name="oldUsername"/> or <paramref name="newUsername"/> is null or empty.</exception>

+        /// <exception cref="UserNotExistException">Thrown if the user with old username does not exist.</exception>

+        /// <exception cref="UsernameBadFormatException">Thrown if the new username is not accepted because of bad format.</exception>

+        /// <exception cref="UserAlreadyExistException">Thrown if user with the new username already exists.</exception>

+        Task ChangeUsername(string oldUsername, string newUsername);

     }

 

     internal class UserCache

@@ -432,5 +463,31 @@ namespace Timeline.Services
             //clear cache

             RemoveCache(user.Id);

         }

+

+        public async Task ChangeUsername(string oldUsername, string newUsername)

+        {

+            if (string.IsNullOrEmpty(oldUsername))

+                throw new ArgumentException("Old username is null or empty", nameof(oldUsername));

+            if (string.IsNullOrEmpty(newUsername))

+                throw new ArgumentException("New username is null or empty", nameof(newUsername));

+

+            if (!_usernameValidator.Validate(newUsername, out var message))

+                throw new UsernameBadFormatException(newUsername, $"New username is of bad format. {message}");

+

+            var user = await _databaseContext.Users.Where(u => u.Name == oldUsername).SingleOrDefaultAsync();

+            if (user == null)

+                throw new UserNotExistException(oldUsername);

+

+            var conflictUser = await _databaseContext.Users.Where(u => u.Name == newUsername).SingleOrDefaultAsync();

+            if (conflictUser != null)

+                throw new UserAlreadyExistException(newUsername);

+

+            user.Name = newUsername;

+            user.Version += 1;

+            await _databaseContext.SaveChangesAsync();

+            _logger.LogInformation(FormatLogMessage("A user entry changed name field.",

+                Pair("Id", user.Id), Pair("Old Username", oldUsername), Pair("New Username", newUsername)));

+            RemoveCache(user.Id);

+        }

     }

 }