3 things.

1. Exchange Models and Entities namespace.
2. Fix the bug that input with missing field leads to 500.
3. Write unit tests.

7 files changed, 42 insertions, 183 deletions

diff --git a/Timeline/Entities/DatabaseContext.cs b/Timeline/Entities/DatabaseContext.cs
new file mode 100644
index 00000000..9fe046ac
--- /dev/null
+++ b/Timeline/Entities/DatabaseContext.cs
@@ -0,0 +1,42 @@
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Timeline.Entities
+{
+    public static class UserRoles
+    {
+        public const string Admin = "admin";
+        public const string User = "user";
+    }
+
+    [Table("user")]
+    public class User
+    {
+        [Column("id"), Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public long Id { get; set; }
+
+        [Column("name"), Required]
+        public string Name { get; set; }
+
+        [Column("password"), Required]
+        public string EncryptedPassword { get; set; }
+
+        [Column("roles"), Required]
+        public string RoleString { get; set; }
+
+        [Column("version"), Required]
+        public long Version { get; set; }
+    }
+
+    public class DatabaseContext : DbContext
+    {
+        public DatabaseContext(DbContextOptions<DatabaseContext> options)
+            : base(options)
+        {
+
+        }
+
+        public DbSet<User> Users { get; set; }
+    }
+}
diff --git a/Timeline/Entities/Http/Common.cs b/Timeline/Entities/Http/Common.cs
deleted file mode 100644
index 3a45a0ae..00000000
--- a/Timeline/Entities/Http/Common.cs
+++ /dev/null
@@ -1,37 +0,0 @@
-namespace Timeline.Entities.Http
-{
-    public class CommonResponse
-    {
-        public CommonResponse()
-        {
-
-        }
-
-        public CommonResponse(int code, string message)
-        {
-            Code = code;
-            Message = message;
-        }
-
-        public int Code { get; set; }
-        public string Message { get; set; }
-    }
-
-    public static class CommonPutResponse
-    {
-        public const int CreatedCode = 0;
-        public const int ModifiedCode = 1;
-
-        public static CommonResponse Created { get; } = new CommonResponse(CreatedCode, "A new item is created.");
-        public static CommonResponse Modified { get; } = new CommonResponse(ModifiedCode, "An existent item is modified.");
-    }
-
-    public static class CommonDeleteResponse
-    {
-        public const int DeletedCode = 0;
-        public const int NotExistsCode = 1;
-
-        public static CommonResponse Deleted { get; } = new CommonResponse(DeletedCode, "An existent item is deleted.");
-        public static CommonResponse NotExists { get; } = new CommonResponse(NotExistsCode, "The item does not exist.");
-    }
-}
diff --git a/Timeline/Entities/Http/Token.cs b/Timeline/Entities/Http/Token.cs
deleted file mode 100644
index 8a02ed2e..00000000
--- a/Timeline/Entities/Http/Token.cs
+++ /dev/null
@@ -1,26 +0,0 @@
-namespace Timeline.Entities.Http
-{
-    public class CreateTokenRequest
-    {
-        public string Username { get; set; }
-        public string Password { get; set; }
-        // in day
-        public double? ExpireOffset { get; set; }
-    }
-
-    public class CreateTokenResponse
-    {
-        public string Token { get; set; }
-        public UserInfo User { get; set; }
-    }
-
-    public class VerifyTokenRequest
-    {
-        public string Token { get; set; }
-    }
-
-    public class VerifyTokenResponse
-    {
-        public UserInfo User { get; set; }
-    }
-}
diff --git a/Timeline/Entities/Http/User.cs b/Timeline/Entities/Http/User.cs
deleted file mode 100644
index b5384778..00000000
--- a/Timeline/Entities/Http/User.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-namespace Timeline.Entities.Http
-{
-    public class UserPutRequest
-    {
-        public string Password { get; set; }
-        public bool Administrator { get; set; }
-    }
-
-    public class UserPatchRequest
-    {
-        public string Password { get; set; }
-        public bool? Administrator { get; set; }
-    }
-
-    public class ChangePasswordRequest
-    {
-        public string OldPassword { get; set; }
-        public string NewPassword { get; set; }
-    }
-}
diff --git a/Timeline/Entities/PutResult.cs b/Timeline/Entities/PutResult.cs
deleted file mode 100644
index 4ed48572..00000000
--- a/Timeline/Entities/PutResult.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-namespace Timeline.Entities
-{
-    /// <summary>
-    /// Represents the result of a "put" operation.
-    /// </summary>
-    public enum PutResult
-    {
-        /// <summary>
-        /// Indicates the item did not exist and now is created.
-        /// </summary>
-        Created,
-        /// <summary>
-        /// Indicates the item exists already and is modified.
-        /// </summary>
-        Modified
-    }
-}
diff --git a/Timeline/Entities/UserInfo.cs b/Timeline/Entities/UserInfo.cs
deleted file mode 100644
index 414a8dfe..00000000
--- a/Timeline/Entities/UserInfo.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-namespace Timeline.Entities
-{
-    public sealed class UserInfo
-    {
-        public UserInfo()
-        {
-        }
-
-        public UserInfo(string username, bool administrator)
-        {
-            Username = username;
-            Administrator = administrator;
-        }
-
-        public string Username { get; set; }
-        public bool Administrator { get; set; }
-
-        public override string ToString()
-        {
-            return $"Username: {Username} ; Administrator: {Administrator}";
-        }
-    }
-}
diff --git a/Timeline/Entities/UserUtility.cs b/Timeline/Entities/UserUtility.cs
deleted file mode 100644
index 14cdb2d6..00000000
--- a/Timeline/Entities/UserUtility.cs
+++ /dev/null
@@ -1,60 +0,0 @@
-using System;
-using System.Linq;
-using Timeline.Models;
-using Timeline.Services;
-
-namespace Timeline.Entities
-{
-    public static class UserUtility
-    {
-        public const string UserRole = UserRoles.User;
-        public const string AdminRole = UserRoles.Admin;
-
-        public static string[] UserRoleArray { get; } = new string[] { UserRole };
-        public static string[] AdminRoleArray { get; } = new string[] { UserRole, AdminRole };
-
-        public static string[] IsAdminToRoleArray(bool isAdmin)
-        {
-            return isAdmin ? AdminRoleArray : UserRoleArray;
-        }
-
-        public static bool RoleArrayToIsAdmin(string[] roles)
-        {
-            return roles.Contains(AdminRole);
-        }
-
-        public static string[] RoleStringToRoleArray(string roleString)
-        {
-            return roleString.Split(',').ToArray();
-        }
-
-        public static string RoleArrayToRoleString(string[] roles)
-        {
-            return string.Join(',', roles);
-        }
-
-        public static string IsAdminToRoleString(bool isAdmin)
-        {
-            return RoleArrayToRoleString(IsAdminToRoleArray(isAdmin));
-        }
-
-        public static bool RoleStringToIsAdmin(string roleString)
-        {
-            return RoleArrayToIsAdmin(RoleStringToRoleArray(roleString));
-        }
-
-        public static UserInfo CreateUserInfo(User user)
-        {
-            if (user == null)
-                throw new ArgumentNullException(nameof(user));
-            return new UserInfo(user.Name, RoleStringToIsAdmin(user.RoleString));
-        }
-
-        internal static UserCache CreateUserCache(User user)
-        {
-            if (user == null)
-                throw new ArgumentNullException(nameof(user));
-            return new UserCache { Username = user.Name, Administrator = RoleStringToIsAdmin(user.RoleString), Version = user.Version };
-        }
-    }
-}