From ad187b72edc974e1258a058785d879ba8d8afadf Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 12 Jul 2020 17:12:47 +0800
Subject: Add http api and integrated tests.

---
 Timeline.Tests/IntegratedTests/TimelineTest.cs | 75 ++++++++++++++++++++++++++
 Timeline/Controllers/TimelineController.cs     | 47 ++++++++++++++--
 2 files changed, 118 insertions(+), 4 deletions(-)

diff --git a/Timeline.Tests/IntegratedTests/TimelineTest.cs b/Timeline.Tests/IntegratedTests/TimelineTest.cs
index ba335bd6..49672f29 100644
--- a/Timeline.Tests/IntegratedTests/TimelineTest.cs
+++ b/Timeline.Tests/IntegratedTests/TimelineTest.cs
@@ -1332,5 +1332,80 @@ namespace Timeline.Tests.IntegratedTests
                 posts.Select(p => p.Content == null).Should().Equal(false, true, false);
             }
         }
+
+        [Theory]
+        [MemberData(nameof(TimelineUrlGeneratorData))]
+        public async Task Timeline_Get_IfModifiedSince_And_CheckUniqueId(TimelineUrlGenerator urlGenerator)
+        {
+            using var client = await CreateClientAsUser();
+
+            DateTime lastModifiedTime;
+            TimelineInfo timeline;
+            string uniqueId;
+
+            {
+                var res = await client.GetAsync(urlGenerator(1));
+                var body = res.Should().HaveStatusCode(200)
+                    .And.HaveJsonBody<TimelineInfo>().Which;
+                timeline = body;
+                lastModifiedTime = body.LastModified;
+                uniqueId = body.UniqueId;
+            }
+
+            {
+                using var req = new HttpRequestMessage
+                {
+                    RequestUri = new Uri(client.BaseAddress, urlGenerator(1)),
+                    Method = HttpMethod.Get,
+                };
+                req.Headers.IfModifiedSince = lastModifiedTime.AddSeconds(1);
+                var res = await client.SendAsync(req);
+                res.Should().HaveStatusCode(304);
+            }
+
+            {
+                using var req = new HttpRequestMessage
+                {
+                    RequestUri = new Uri(client.BaseAddress, urlGenerator(1)),
+                    Method = HttpMethod.Get,
+                };
+                req.Headers.IfModifiedSince = lastModifiedTime.AddSeconds(-1);
+                var res = await client.SendAsync(req);
+                res.Should().HaveStatusCode(200)
+                    .And.HaveJsonBody<TimelineInfo>()
+                    .Which.Should().BeEquivalentTo(timeline);
+            }
+
+            {
+                var res = await client.GetAsync(urlGenerator(1, null,
+                    new Dictionary<string, string> { { "ifModifiedSince", lastModifiedTime.AddSeconds(1).ToString("s", CultureInfo.InvariantCulture) } }));
+                res.Should().HaveStatusCode(304);
+            }
+
+            {
+                var res = await client.GetAsync(urlGenerator(1, null,
+                    new Dictionary<string, string> { { "ifModifiedSince", lastModifiedTime.AddSeconds(-1).ToString("s", CultureInfo.InvariantCulture) } }));
+                res.Should().HaveStatusCode(200)
+                    .And.HaveJsonBody<TimelineInfo>()
+                    .Which.Should().BeEquivalentTo(timeline);
+            }
+
+            {
+                var res = await client.GetAsync(urlGenerator(1, null,
+                    new Dictionary<string, string> { { "ifModifiedSince", lastModifiedTime.AddSeconds(1).ToString("s", CultureInfo.InvariantCulture) },
+                        {"checkUniqueId", uniqueId } }));
+                res.Should().HaveStatusCode(304);
+            }
+
+            {
+                var testUniqueId = (uniqueId[0] == 'a' ? "b" : "a") + uniqueId[1..];
+                var res = await client.GetAsync(urlGenerator(1, null,
+                    new Dictionary<string, string> { { "ifModifiedSince", lastModifiedTime.AddSeconds(1).ToString("s", CultureInfo.InvariantCulture) },
+                        {"checkUniqueId", testUniqueId } }));
+                res.Should().HaveStatusCode(200)
+                    .And.HaveJsonBody<TimelineInfo>()
+                    .Which.Should().BeEquivalentTo(timeline);
+            }
+        }
     }
 }
diff --git a/Timeline/Controllers/TimelineController.cs b/Timeline/Controllers/TimelineController.cs
index 2330698f..72404ea3 100644
--- a/Timeline/Controllers/TimelineController.cs
+++ b/Timeline/Controllers/TimelineController.cs
@@ -94,11 +94,50 @@ namespace Timeline.Controllers
         }
 
         [HttpGet("timelines/{name}")]
-        public async Task<ActionResult<TimelineInfo>> TimelineGet([FromRoute][GeneralTimelineName] string name)
+        public async Task<ActionResult<TimelineInfo>> TimelineGet([FromRoute][GeneralTimelineName] string name, [FromQuery] string? checkUniqueId, [FromQuery(Name = "ifModifiedSince")] DateTime? queryIfModifiedSince, [FromHeader(Name = "If-Modified-Since")] DateTime? headerIfModifiedSince)
         {
-            var timeline = await _service.GetTimeline(name);
-            var result = _mapper.Map<TimelineInfo>(timeline);
-            return result;
+            DateTime? ifModifiedSince = null;
+            if (queryIfModifiedSince.HasValue)
+            {
+                ifModifiedSince = queryIfModifiedSince.Value;
+            }
+            else if (headerIfModifiedSince != null)
+            {
+                ifModifiedSince = headerIfModifiedSince.Value;
+            }
+
+            bool returnNotModified = false;
+
+            if (ifModifiedSince.HasValue)
+            {
+                var lastModified = await _service.GetTimelineLastModifiedTime(name);
+                if (lastModified < ifModifiedSince.Value)
+                {
+                    if (checkUniqueId != null)
+                    {
+                        var uniqueId = await _service.GetTimelineUniqueId(name);
+                        if (uniqueId == checkUniqueId)
+                        {
+                            returnNotModified = true;
+                        }
+                    }
+                    else
+                    {
+                        returnNotModified = true;
+                    }
+                }
+            }
+
+            if (returnNotModified)
+            {
+                return StatusCode(StatusCodes.Status304NotModified);
+            }
+            else
+            {
+                var timeline = await _service.GetTimeline(name);
+                var result = _mapper.Map<TimelineInfo>(timeline);
+                return result;
+            }
         }
 
         [HttpGet("timelines/{name}/posts")]
-- 
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