5 files changed, 101 insertions, 0 deletions
diff --git a/Timeline/Controllers/UserDetailController.cs b/Timeline/Controllers/UserDetailController.cs
new file mode 100644
index 00000000..ef13b462
--- /dev/null
+++ b/Timeline/Controllers/UserDetailController.cs
@@ -0,0 +1,44 @@
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+using Timeline.Filters;
+using Timeline.Models.Validation;
+using Timeline.Services;
+using System.ComponentModel.DataAnnotations;
+
+namespace Timeline.Controllers
+{
+    [ApiController]
+    public class UserDetailController : Controller
+    {
+        private readonly IUserDetailService _service;
+
+        public UserDetailController(IUserDetailService service)
+        {
+            _service = service;
+        }
+
+        [HttpGet("users/{username}/nickname")]
+        [CatchUserNotExistException]
+        public async Task<ActionResult<string>> GetNickname([FromRoute][Username] string username)
+        {
+            return Ok(await _service.GetNickname(username));
+        }
+
+        [HttpPut("users/{username}/nickname")]
+        [CatchUserNotExistException]
+        public async Task<ActionResult> PutNickname([FromRoute][Username] string username,
+            [FromBody][StringLength(10, MinimumLength = 1)] string body)
+        {
+            await _service.SetNickname(username, body);
+            return Ok();
+        }
+
+        [HttpDelete("users/{username}/nickname")]
+        [CatchUserNotExistException]
+        public async Task<ActionResult> DeleteNickname([FromRoute][Username] string username)
+        {
+            await _service.SetNickname(username, null);
+            return Ok();
+        }
+    }
+}
diff --git a/Timeline/Filters/User.cs b/Timeline/Filters/User.cs
new file mode 100644
index 00000000..22fae938
--- /dev/null
+++ b/Timeline/Filters/User.cs
@@ -0,0 +1,42 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Filters;
+using System;
+using Timeline.Models.Http;
+
+namespace Timeline
+{
+    public static partial class ErrorCodes
+    {
+        public static partial class Http
+        {
+            public static partial class Filter // bxx = 1xx
+            {
+                public static class User // bbb = 101
+                {
+                    public const int NotExist = 11010001;
+                }
+
+            }
+        }
+    }
+}
+
+namespace Timeline.Filters
+{
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = true, Inherited = true)]
+    public class CatchUserNotExistExceptionAttribute : ExceptionFilterAttribute
+    {
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1062:Validate arguments of public methods", Justification = "ASP.Net already checked.")]
+        public override void OnException(ExceptionContext context)
+        {
+            var body = new CommonResponse(
+                ErrorCodes.Http.Filter.User.NotExist,
+                Resources.Filters.MessageUserNotExist);
+
+            if (context.HttpContext.Request.Method == "GET")
+                context.Result = new NotFoundObjectResult(body);
+            else
+                context.Result = new BadRequestObjectResult(body);
+        }
+    }
+}
diff --git a/Timeline/Resources/Filters.Designer.cs b/Timeline/Resources/Filters.Designer.cs
index ae3565f7..e3c8be41 100644
--- a/Timeline/Resources/Filters.Designer.cs
+++ b/Timeline/Resources/Filters.Designer.cs
@@ -86,5 +86,14 @@ namespace Timeline.Resources {
                 return ResourceManager.GetString("MessageHeaderContentTypeMissing", resourceCulture);
             }
         }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to The user does not exist..
+        /// </summary>
+        internal static string MessageUserNotExist {
+            get {
+                return ResourceManager.GetString("MessageUserNotExist", resourceCulture);
+            }
+        }
     }
 }
diff --git a/Timeline/Resources/Filters.resx b/Timeline/Resources/Filters.resx
index d2b7e68a..ba1fcee8 100644
--- a/Timeline/Resources/Filters.resx
+++ b/Timeline/Resources/Filters.resx
@@ -126,4 +126,7 @@
   <data name="MessageHeaderContentTypeMissing" xml:space="preserve">
     <value>Header Content-Type is required.</value>
   </data>
+  <data name="MessageUserNotExist" xml:space="preserve">
+    <value>The user does not exist.</value>
+  </data>
 </root>
 \ No newline at end of file
diff --git a/Timeline/Resources/Filters.zh.resx b/Timeline/Resources/Filters.zh.resx
index 90e97e49..690a3e39 100644
--- a/Timeline/Resources/Filters.zh.resx
+++ b/Timeline/Resources/Filters.zh.resx
@@ -126,4 +126,7 @@
   <data name="MessageHeaderContentTypeMissing" xml:space="preserve">
     <value>缺少必需的请求头Content-Type。</value>
   </data>
+  <data name="MessageUserNotExist" xml:space="preserve">
+    <value>用户不存在。</value>
+  </data>
 </root>
 \ No newline at end of file