Use etag for cache.

1 files changed, 13 insertions, 10 deletions

diff --git a/Timeline/Controllers/UserAvatarController.cs b/Timeline/Controllers/UserAvatarController.cs
index ffadcb86..964c9b98 100644
--- a/Timeline/Controllers/UserAvatarController.cs
+++ b/Timeline/Controllers/UserAvatarController.cs
@@ -2,7 +2,9 @@
 using Microsoft.AspNetCore.Http;

 using Microsoft.AspNetCore.Mvc;

 using Microsoft.Extensions.Logging;

+using Microsoft.Net.Http.Headers;

 using System;

+using System.Linq;

 using System.Threading.Tasks;

 using Timeline.Authenticate;

 using Timeline.Filters;

@@ -61,22 +63,23 @@ namespace Timeline.Controllers
         [Authorize]

         public async Task<IActionResult> Get([FromRoute] string username)

         {

-            const string IfModifiedSinceHeaderKey = "If-Modified-Since";

+            const string IfNonMatchHeaderKey = "If-None-Match";

             try

             {

-                var avatarInfo = await _service.GetAvatar(username);

-                var avatar = avatarInfo.Avatar;

-                if (Request.Headers.TryGetValue(IfModifiedSinceHeaderKey, out var value))

+                var eTag = new EntityTagHeaderValue($"\"{await _service.GetAvatarETag(username)}\"");

+

+                if (Request.Headers.TryGetValue(IfNonMatchHeaderKey, out var value))

                 {

-                    var t = DateTime.Parse(value);

-                    if (t > avatarInfo.LastModified)

-                    {

-                        Response.Headers.Add(IfModifiedSinceHeaderKey, avatarInfo.LastModified.ToString("r"));

+                    if (!EntityTagHeaderValue.TryParseStrictList(value, out var eTagList))

+                        return BadRequest(CommonResponse.BadIfNonMatch());

+

+                    if (eTagList.First(e => e.Equals(eTag)) != null)

                         return StatusCode(StatusCodes.Status304NotModified);

-                    }

                 }

 

-                return File(avatar.Data, avatar.Type, new DateTimeOffset(avatarInfo.LastModified), null);

+                var avatarInfo = await _service.GetAvatar(username);

+                var avatar = avatarInfo.Avatar;

+                return File(avatar.Data, avatar.Type, new DateTimeOffset(avatarInfo.LastModified), eTag);

             }

             catch (UserNotExistException e)

             {