From 6edc70c00bca22e13ade23472d48d7b940f92eef Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Sat, 17 Aug 2019 19:56:42 +0800
Subject: Add change username.

---
 Timeline/Controllers/UserController.cs | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

(limited to 'Timeline/Controllers')

diff --git a/Timeline/Controllers/UserController.cs b/Timeline/Controllers/UserController.cs
index d38f96e1..bd13f0a3 100644
--- a/Timeline/Controllers/UserController.cs
+++ b/Timeline/Controllers/UserController.cs
@@ -22,7 +22,10 @@ namespace Timeline.Controllers
 
             public const int Patch_NotExist = -3001;
 
-            public const int ChangePassword_BadOldPassword = -4001;
+            public const int ChangeUsername_NotExist = -4001;
+            public const int ChangeUsername_AlreadyExist = -4002;
+
+            public const int ChangePassword_BadOldPassword = -5001;
         }
 
         private readonly ILogger<UserController> _logger;
@@ -108,6 +111,31 @@ namespace Timeline.Controllers
             }
         }
 
+        [HttpPost("userop/changeusername"), AdminAuthorize]
+        public async Task<IActionResult> ChangeUsername([FromBody] ChangeUsernameRequest request)
+        {
+            try
+            {
+                await _userService.ChangeUsername(request.OldUsername, request.NewUsername);
+                _logger.LogInformation(FormatLogMessage("A user changed username.",
+                    Pair("Old Username", request.OldUsername), Pair("New Username", request.NewUsername)));
+                return Ok();
+            }
+            catch (UserNotExistException e)
+            {
+                _logger.LogInformation(e, FormatLogMessage("Attempt to change a non-existent user's username failed.",
+                    Pair("Old Username", request.OldUsername), Pair("New Username", request.NewUsername)));
+                return BadRequest(new CommonResponse(ErrorCodes.ChangeUsername_NotExist, $"The user {request.OldUsername} does not exist."));
+            }
+            catch (UserAlreadyExistException e)
+            {
+                _logger.LogInformation(e, FormatLogMessage("Attempt to change a user's username to a existent one failed.",
+                    Pair("Old Username", request.OldUsername), Pair("New Username", request.NewUsername)));
+                return BadRequest(new CommonResponse(ErrorCodes.ChangeUsername_AlreadyExist, $"The user {request.NewUsername} already exists."));
+            }
+            // there is no need to catch bad format exception because it is already checked in model validation.
+        }
+
         [HttpPost("userop/changepassword"), Authorize]
         public async Task<IActionResult> ChangePassword([FromBody] ChangePasswordRequest request)
         {
-- 
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