From 5b2464a8113fa4a68c8749b3553a5924d2131d9f Mon Sep 17 00:00:00 2001
From: 杨宇千 <crupest@outlook.com>
Date: Mon, 19 Aug 2019 15:43:47 +0800
Subject: Add avatar 304.

---
 Timeline/Controllers/UserAvatarController.cs | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'Timeline/Controllers/UserAvatarController.cs')

diff --git a/Timeline/Controllers/UserAvatarController.cs b/Timeline/Controllers/UserAvatarController.cs
index 710ca764..89d2650c 100644
--- a/Timeline/Controllers/UserAvatarController.cs
+++ b/Timeline/Controllers/UserAvatarController.cs
@@ -57,10 +57,22 @@ namespace Timeline.Controllers
         [Authorize]
         public async Task<IActionResult> Get(string username)
         {
+            const string IfModifiedSinceHeaderKey = "If-Modified-Since";
             try
             {
-                var avatar = await _service.GetAvatar(username);
-                return File(avatar.Data, avatar.Type);
+                var avatarInfo = await _service.GetAvatar(username);
+                var avatar = avatarInfo.Avatar;
+                if (Request.Headers.TryGetValue(IfModifiedSinceHeaderKey, out var value))
+                {
+                    var t = DateTime.Parse(value);
+                    if (t > avatarInfo.LastModified)
+                    {
+                        Response.Headers.Add(IfModifiedSinceHeaderKey, avatarInfo.LastModified.ToString("r"));
+                        return StatusCode(StatusCodes.Status304NotModified);
+                    }
+                }
+
+                return File(avatar.Data, avatar.Type, new DateTimeOffset(avatarInfo.LastModified), null);
             }
             catch (UserNotExistException e)
             {
-- 
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