From 7e414fb4a09e6d35fa32d48fdba38a537ffe1d23 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Mon, 31 Aug 2020 22:39:18 +0800
Subject: Post info now contain data etag.

---
 Timeline.Tests/IntegratedTests/TimelineTest.cs | 34 ++++++++++++++++++++++++++
 Timeline/Models/Http/Timeline.cs               |  7 +++++-
 Timeline/Models/Timeline.cs                    |  4 +++
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/Timeline.Tests/IntegratedTests/TimelineTest.cs b/Timeline.Tests/IntegratedTests/TimelineTest.cs
index ac4f41a2..ec46b96a 100644
--- a/Timeline.Tests/IntegratedTests/TimelineTest.cs
+++ b/Timeline.Tests/IntegratedTests/TimelineTest.cs
@@ -1485,5 +1485,39 @@ namespace Timeline.Tests.IntegratedTests
                 }
             }
         }
+
+        [Theory]
+        [MemberData(nameof(TimelineUrlGeneratorData))]
+        public async Task PostDataETag(TimelineUrlGenerator urlGenerator)
+        {
+            using var client = await CreateClientAsUser();
+
+            long id;
+            string etag;
+
+            {
+                var res = await client.PostAsJsonAsync(urlGenerator(1, "posts"), new TimelinePostCreateRequest
+                {
+                    Content = new TimelinePostCreateRequestContent
+                    {
+                        Type = TimelinePostContentTypes.Image,
+                        Data = Convert.ToBase64String(ImageHelper.CreatePngWithSize(100, 50))
+                    }
+                });
+                res.Should().HaveStatusCode(200);
+                var body = await res.ReadBodyAsJsonAsync<TimelinePostInfo>();
+                body.Content.ETag.Should().NotBeNullOrEmpty();
+
+                id = body.Id;
+                etag = body.Content.ETag;
+            }
+
+            {
+                var res = await client.GetAsync(urlGenerator(1, $"posts/{id}/data"));
+                res.Should().HaveStatusCode(200);
+                res.Headers.ETag.Should().NotBeNull();
+                res.Headers.ETag.ToString().Should().Be(etag);
+            }
+        }
     }
 }
diff --git a/Timeline/Models/Http/Timeline.cs b/Timeline/Models/Http/Timeline.cs
index 3596af18..a81b33f5 100644
--- a/Timeline/Models/Http/Timeline.cs
+++ b/Timeline/Models/Http/Timeline.cs
@@ -25,6 +25,10 @@ namespace Timeline.Models.Http
         /// If post is of image type. This is the image url.
         /// </summary>
         public string? Url { get; set; }
+        /// <summary>
+        /// If post has data (currently it means it's a image post), this is the data etag.
+        /// </summary>
+        public string? ETag { get; set; }
     }
 
     /// <summary>
@@ -192,7 +196,8 @@ namespace Timeline.Models.Http
                     Url = urlHelper.ActionLink(
                         action: nameof(TimelineController.PostDataGet),
                         controller: nameof(TimelineController)[0..^nameof(Controller).Length],
-                        values: new { Name = source.TimelineName, Id = source.Id })
+                        values: new { Name = source.TimelineName, Id = source.Id }),
+                    ETag = $"\"{imageContent.DataTag}\""
                 };
             }
             else
diff --git a/Timeline/Models/Timeline.cs b/Timeline/Models/Timeline.cs
index 42906053..a5987577 100644
--- a/Timeline/Models/Timeline.cs
+++ b/Timeline/Models/Timeline.cs
@@ -43,6 +43,10 @@ namespace Timeline.Models
         public ImageTimelinePostContent(string dataTag) { DataTag = dataTag; }
 
         public string Type { get; } = TimelinePostContentTypes.Image;
+
+        /// <summary>
+        /// The tag of the data. The tag of the entry in DataManager. Also the etag (not quoted).
+        /// </summary>
         public string DataTag { get; set; }
     }
 
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