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| author | crupest <crupest@outlook.com> | 2021-02-10 02:03:06 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2021-02-10 02:03:06 +0800 |
| commit | 253b06dfaa091d986a8714c081fd1e01679f538a (patch) | |
| tree | 9200a7f6607889fcfb13b7ba14cc30db54fe3499 /BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs | |
| parent | bc2d6676276ea85a974f57f96b038e35e6ce7460 (diff) | |
| download | timeline-253b06dfaa091d986a8714c081fd1e01679f538a.tar.gz timeline-253b06dfaa091d986a8714c081fd1e01679f538a.tar.bz2 timeline-253b06dfaa091d986a8714c081fd1e01679f538a.zip | |
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Diffstat (limited to 'BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs')
| -rw-r--r-- | BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs b/BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs new file mode 100644 index 00000000..c26bdddc --- /dev/null +++ b/BackEnd/Timeline/Helpers/Cache/DataCacheHelper.cs @@ -0,0 +1,82 @@ +using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Net.Http.Headers;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Timeline.Models;
+using Timeline.Models.Http;
+
+namespace Timeline.Helpers.Cache
+{
+ public static class DataCacheHelper
+ {
+ public static async Task<ActionResult> GenerateActionResult(Controller controller, ICacheableDataProvider provider, TimeSpan? maxAge = null)
+ {
+ const string CacheControlHeaderKey = "Cache-Control";
+ const string IfNonMatchHeaderKey = "If-None-Match";
+ const string IfModifiedSinceHeaderKey = "If-Modified-Since";
+ const string ETagHeaderKey = "ETag";
+ const string LastModifiedHeaderKey = "Last-Modified";
+
+ string GenerateCacheControlHeaderValue()
+ {
+ var cacheControlHeader = new CacheControlHeaderValue()
+ {
+ NoCache = true,
+ NoStore = false,
+ MaxAge = maxAge ?? TimeSpan.FromDays(14),
+ Private = true,
+ MustRevalidate = true
+ };
+ return cacheControlHeader.ToString();
+ }
+
+ var digest = await provider.GetDigest();
+ var eTagValue = '"' + digest.ETag + '"';
+ var eTag = new EntityTagHeaderValue(eTagValue);
+
+ ActionResult Generate304Result()
+ {
+ controller.Response.Headers.Add(ETagHeaderKey, eTagValue);
+ controller.Response.Headers.Add(LastModifiedHeaderKey, digest.LastModified.ToString("R"));
+ controller.Response.Headers.Add(CacheControlHeaderKey, GenerateCacheControlHeaderValue());
+ return controller.StatusCode(StatusCodes.Status304NotModified, null);
+ }
+
+ if (controller.Request.Headers.TryGetValue(IfNonMatchHeaderKey, out var ifNonMatchHeaderValue))
+ {
+ if (!EntityTagHeaderValue.TryParseList(ifNonMatchHeaderValue, out var eTagList))
+ {
+ return controller.BadRequest(ErrorResponse.Common.Header.IfNonMatch_BadFormat());
+ }
+
+ if (eTagList.FirstOrDefault(e => e.Equals(eTag)) != null)
+ {
+ return Generate304Result();
+ }
+ }
+ else if (controller.Request.Headers.TryGetValue(IfModifiedSinceHeaderKey, out var ifModifiedSinceHeaderValue))
+ {
+ if (!DateTime.TryParse(ifModifiedSinceHeaderValue, out var headerValue))
+ {
+ return controller.BadRequest(new CommonResponse(ErrorCodes.Common.Header.IfModifiedSince_BadFormat, "Header If-Modified-Since is of bad format."));
+ }
+
+ if (headerValue > digest.LastModified)
+ {
+ return Generate304Result();
+ }
+ }
+
+ var data = await provider.GetData();
+ controller.Response.Headers.Add(CacheControlHeaderKey, GenerateCacheControlHeaderValue());
+ return controller.File(data.Data, data.ContentType, digest.LastModified, eTag);
+ }
+
+ public static Task<ActionResult> GenerateActionResult(Controller controller, Func<Task<ICacheableDataDigest>> getDigestDelegate, Func<Task<ByteData>> getDataDelegate, TimeSpan? maxAge = null)
+ {
+ return GenerateActionResult(controller, new DelegateCacheableDataProvider(getDigestDelegate, getDataDelegate), maxAge);
+ }
+ }
+}
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