841 lines
31 KiB
C#
841 lines
31 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.IO.Compression;
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using System.Net;
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using System.Runtime.Serialization;
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using System.Text;
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using System.Threading.Tasks;
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using System.Xml;
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using Emby.Server.Implementations.HttpServer;
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using Emby.Server.Implementations.Services;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Services;
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using IRequest = MediaBrowser.Model.Services.IRequest;
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using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
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using StreamWriter = Emby.Server.Implementations.HttpServer.StreamWriter;
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namespace Emby.Server.Implementations.HttpServer
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{
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/// <summary>
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/// Class HttpResultFactory
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/// </summary>
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public class HttpResultFactory : IHttpResultFactory
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{
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/// <summary>
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/// The _logger
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/// </summary>
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private readonly ILogger _logger;
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private readonly IFileSystem _fileSystem;
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private readonly IJsonSerializer _jsonSerializer;
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private readonly IMemoryStreamFactory _memoryStreamFactory;
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/// <summary>
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/// Initializes a new instance of the <see cref="HttpResultFactory" /> class.
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/// </summary>
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public HttpResultFactory(ILogManager logManager, IFileSystem fileSystem, IJsonSerializer jsonSerializer, IMemoryStreamFactory memoryStreamFactory)
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{
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_fileSystem = fileSystem;
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_jsonSerializer = jsonSerializer;
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_memoryStreamFactory = memoryStreamFactory;
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_logger = logManager.GetLogger("HttpResultFactory");
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}
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/// <summary>
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/// Gets the result.
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/// </summary>
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/// <param name="content">The content.</param>
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/// <param name="contentType">Type of the content.</param>
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/// <param name="responseHeaders">The response headers.</param>
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/// <returns>System.Object.</returns>
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public object GetResult(object content, string contentType, IDictionary<string, string> responseHeaders = null)
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{
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return GetHttpResult(content, contentType, true, responseHeaders);
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}
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public object GetRedirectResult(string url)
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{
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var responseHeaders = new Dictionary<string, string>();
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responseHeaders["Location"] = url;
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var result = new HttpResult(new byte[] { }, "text/plain", HttpStatusCode.Redirect);
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AddResponseHeaders(result, responseHeaders);
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return result;
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}
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/// <summary>
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/// Gets the HTTP result.
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/// </summary>
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private IHasHeaders GetHttpResult(object content, string contentType, bool addCachePrevention, IDictionary<string, string> responseHeaders = null)
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{
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IHasHeaders result;
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var stream = content as Stream;
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if (stream != null)
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{
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result = new StreamWriter(stream, contentType, _logger);
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}
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else
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{
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var bytes = content as byte[];
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if (bytes != null)
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{
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result = new StreamWriter(bytes, contentType, _logger);
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}
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else
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{
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var text = content as string;
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if (text != null)
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{
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result = new StreamWriter(Encoding.UTF8.GetBytes(text), contentType, _logger);
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}
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else
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{
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result = new HttpResult(content, contentType, HttpStatusCode.OK);
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}
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}
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}
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if (responseHeaders == null)
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{
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responseHeaders = new Dictionary<string, string>();
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}
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string expires;
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if (addCachePrevention && !responseHeaders.TryGetValue("Expires", out expires))
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{
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responseHeaders["Expires"] = "-1";
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}
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AddResponseHeaders(result, responseHeaders);
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return result;
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}
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/// <summary>
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/// Gets the optimized result.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="requestContext">The request context.</param>
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/// <param name="result">The result.</param>
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/// <param name="responseHeaders">The response headers.</param>
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/// <returns>System.Object.</returns>
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/// <exception cref="System.ArgumentNullException">result</exception>
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public object GetOptimizedResult<T>(IRequest requestContext, T result, IDictionary<string, string> responseHeaders = null)
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where T : class
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{
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return GetOptimizedResultInternal<T>(requestContext, result, true, responseHeaders);
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}
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private object GetOptimizedResultInternal<T>(IRequest requestContext, T result, bool addCachePrevention, IDictionary<string, string> responseHeaders = null)
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where T : class
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{
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if (result == null)
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{
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throw new ArgumentNullException("result");
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}
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var optimizedResult = ToOptimizedResult(requestContext, result);
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if (responseHeaders == null)
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{
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responseHeaders = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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}
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if (addCachePrevention)
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{
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responseHeaders["Expires"] = "-1";
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}
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// Apply headers
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var hasHeaders = optimizedResult as IHasHeaders;
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if (hasHeaders != null)
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{
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AddResponseHeaders(hasHeaders, responseHeaders);
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}
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return optimizedResult;
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}
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public static string GetCompressionType(IRequest request)
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{
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var acceptEncoding = request.Headers["Accept-Encoding"];
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if (!string.IsNullOrWhiteSpace(acceptEncoding))
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{
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if (acceptEncoding.Contains("deflate"))
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return "deflate";
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if (acceptEncoding.Contains("gzip"))
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return "gzip";
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}
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return null;
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}
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/// <summary>
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/// Returns the optimized result for the IRequestContext.
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/// Does not use or store results in any cache.
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/// </summary>
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/// <param name="request"></param>
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/// <param name="dto"></param>
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/// <returns></returns>
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public object ToOptimizedResult<T>(IRequest request, T dto)
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{
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var compressionType = GetCompressionType(request);
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if (compressionType == null)
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{
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var contentType = request.ResponseContentType;
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switch (GetRealContentType(contentType))
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{
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case "application/xml":
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case "text/xml":
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case "text/xml; charset=utf-8": //"text/xml; charset=utf-8" also matches xml
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return SerializeToXmlString(dto);
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case "application/json":
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case "text/json":
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return _jsonSerializer.SerializeToString(dto);
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}
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}
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// Do not use the memoryStreamFactory here, they don't place nice with compression
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using (var ms = new MemoryStream())
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{
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var contentType = request.ResponseContentType;
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var writerFn = RequestHelper.GetResponseWriter(HttpListenerHost.Instance, contentType);
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writerFn(dto, ms);
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ms.Position = 0;
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var responseHeaders = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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return GetCompressedResult(ms, compressionType, responseHeaders, false, request.ResponseContentType).Result;
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}
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}
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private static Stream GetCompressionStream(Stream outputStream, string compressionType)
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{
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if (compressionType == "deflate")
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return new DeflateStream(outputStream, CompressionMode.Compress, true);
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if (compressionType == "gzip")
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return new GZipStream(outputStream, CompressionMode.Compress, true);
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throw new NotSupportedException(compressionType);
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}
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public static string GetRealContentType(string contentType)
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{
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return contentType == null
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? null
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: contentType.Split(';')[0].ToLower().Trim();
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}
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private string SerializeToXmlString(object from)
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{
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using (var ms = new MemoryStream())
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{
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var xwSettings = new XmlWriterSettings();
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xwSettings.Encoding = new UTF8Encoding(false);
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xwSettings.OmitXmlDeclaration = false;
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using (var xw = XmlWriter.Create(ms, xwSettings))
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{
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var serializer = new DataContractSerializer(from.GetType());
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serializer.WriteObject(xw, from);
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xw.Flush();
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ms.Seek(0, SeekOrigin.Begin);
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var reader = new StreamReader(ms);
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return reader.ReadToEnd();
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}
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}
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}
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/// <summary>
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/// Gets the optimized result using cache.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="requestContext">The request context.</param>
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/// <param name="cacheKey">The cache key.</param>
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/// <param name="lastDateModified">The last date modified.</param>
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/// <param name="cacheDuration">Duration of the cache.</param>
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/// <param name="factoryFn">The factory fn.</param>
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/// <param name="responseHeaders">The response headers.</param>
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/// <returns>System.Object.</returns>
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/// <exception cref="System.ArgumentNullException">cacheKey
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/// or
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/// factoryFn</exception>
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public object GetOptimizedResultUsingCache<T>(IRequest requestContext, Guid cacheKey, DateTime? lastDateModified, TimeSpan? cacheDuration, Func<T> factoryFn, IDictionary<string, string> responseHeaders = null)
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where T : class
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{
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if (cacheKey == Guid.Empty)
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{
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throw new ArgumentNullException("cacheKey");
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}
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if (factoryFn == null)
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{
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throw new ArgumentNullException("factoryFn");
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}
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var key = cacheKey.ToString("N");
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if (responseHeaders == null)
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{
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responseHeaders = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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}
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// See if the result is already cached in the browser
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var result = GetCachedResult(requestContext, responseHeaders, cacheKey, key, lastDateModified, cacheDuration, null);
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if (result != null)
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{
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return result;
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}
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return GetOptimizedResultInternal(requestContext, factoryFn(), false, responseHeaders);
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}
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/// <summary>
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/// To the cached result.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="requestContext">The request context.</param>
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/// <param name="cacheKey">The cache key.</param>
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/// <param name="lastDateModified">The last date modified.</param>
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/// <param name="cacheDuration">Duration of the cache.</param>
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/// <param name="factoryFn">The factory fn.</param>
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/// <param name="contentType">Type of the content.</param>
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/// <param name="responseHeaders">The response headers.</param>
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/// <returns>System.Object.</returns>
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/// <exception cref="System.ArgumentNullException">cacheKey</exception>
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public object GetCachedResult<T>(IRequest requestContext, Guid cacheKey, DateTime? lastDateModified, TimeSpan? cacheDuration, Func<T> factoryFn, string contentType, IDictionary<string, string> responseHeaders = null)
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where T : class
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{
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if (cacheKey == Guid.Empty)
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{
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throw new ArgumentNullException("cacheKey");
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}
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if (factoryFn == null)
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{
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throw new ArgumentNullException("factoryFn");
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}
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var key = cacheKey.ToString("N");
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if (responseHeaders == null)
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{
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responseHeaders = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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}
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// See if the result is already cached in the browser
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var result = GetCachedResult(requestContext, responseHeaders, cacheKey, key, lastDateModified, cacheDuration, contentType);
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if (result != null)
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{
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return result;
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}
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result = factoryFn();
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// Apply caching headers
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var hasHeaders = result as IHasHeaders;
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if (hasHeaders != null)
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{
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AddResponseHeaders(hasHeaders, responseHeaders);
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return hasHeaders;
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}
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return GetHttpResult(result, contentType, false, responseHeaders);
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}
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/// <summary>
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/// Pres the process optimized result.
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/// </summary>
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private object GetCachedResult(IRequest requestContext, IDictionary<string, string> responseHeaders, Guid cacheKey, string cacheKeyString, DateTime? lastDateModified, TimeSpan? cacheDuration, string contentType)
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{
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responseHeaders["ETag"] = string.Format("\"{0}\"", cacheKeyString);
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var noCache = (requestContext.Headers.Get("Cache-Control") ?? string.Empty).IndexOf("no-cache", StringComparison.OrdinalIgnoreCase) != -1;
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if (!noCache)
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{
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if (IsNotModified(requestContext, cacheKey, lastDateModified, cacheDuration))
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{
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AddAgeHeader(responseHeaders, lastDateModified);
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AddExpiresHeader(responseHeaders, cacheKeyString, cacheDuration, noCache);
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var result = new HttpResult(new byte[] { }, contentType ?? "text/html", HttpStatusCode.NotModified);
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AddResponseHeaders(result, responseHeaders);
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return result;
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}
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}
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AddCachingHeaders(responseHeaders, cacheKeyString, lastDateModified, cacheDuration, noCache);
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return null;
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}
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public Task<object> GetStaticFileResult(IRequest requestContext,
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string path,
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FileShareMode fileShare = FileShareMode.Read)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException("path");
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}
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return GetStaticFileResult(requestContext, new StaticFileResultOptions
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{
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Path = path,
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FileShare = fileShare
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});
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}
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public Task<object> GetStaticFileResult(IRequest requestContext,
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StaticFileResultOptions options)
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{
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var path = options.Path;
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var fileShare = options.FileShare;
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException("path");
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}
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if (fileShare != FileShareMode.Read && fileShare != FileShareMode.ReadWrite)
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{
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throw new ArgumentException("FileShare must be either Read or ReadWrite");
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}
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if (string.IsNullOrWhiteSpace(options.ContentType))
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{
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options.ContentType = MimeTypes.GetMimeType(path);
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}
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if (!options.DateLastModified.HasValue)
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{
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options.DateLastModified = _fileSystem.GetLastWriteTimeUtc(path);
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}
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var cacheKey = path + options.DateLastModified.Value.Ticks;
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options.CacheKey = cacheKey.GetMD5();
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options.ContentFactory = () => Task.FromResult(GetFileStream(path, fileShare));
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return GetStaticResult(requestContext, options);
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}
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/// <summary>
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/// Gets the file stream.
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/// </summary>
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/// <param name="path">The path.</param>
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/// <param name="fileShare">The file share.</param>
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/// <returns>Stream.</returns>
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private Stream GetFileStream(string path, FileShareMode fileShare)
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{
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return _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, fileShare);
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}
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public Task<object> GetStaticResult(IRequest requestContext,
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Guid cacheKey,
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DateTime? lastDateModified,
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TimeSpan? cacheDuration,
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string contentType,
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Func<Task<Stream>> factoryFn,
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IDictionary<string, string> responseHeaders = null,
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bool isHeadRequest = false)
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{
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return GetStaticResult(requestContext, new StaticResultOptions
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{
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CacheDuration = cacheDuration,
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CacheKey = cacheKey,
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ContentFactory = factoryFn,
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ContentType = contentType,
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DateLastModified = lastDateModified,
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IsHeadRequest = isHeadRequest,
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ResponseHeaders = responseHeaders
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});
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}
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public async Task<object> GetStaticResult(IRequest requestContext, StaticResultOptions options)
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{
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var cacheKey = options.CacheKey;
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options.ResponseHeaders = options.ResponseHeaders ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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var contentType = options.ContentType;
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if (cacheKey == Guid.Empty)
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{
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throw new ArgumentNullException("cacheKey");
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}
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var key = cacheKey.ToString("N");
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// See if the result is already cached in the browser
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var result = GetCachedResult(requestContext, options.ResponseHeaders, cacheKey, key, options.DateLastModified, options.CacheDuration, contentType);
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if (result != null)
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{
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return result;
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}
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var compress = ShouldCompressResponse(requestContext, contentType);
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var hasHeaders = await GetStaticResult(requestContext, options, compress).ConfigureAwait(false);
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AddResponseHeaders(hasHeaders, options.ResponseHeaders);
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return hasHeaders;
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}
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/// <summary>
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/// Shoulds the compress response.
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/// </summary>
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/// <param name="requestContext">The request context.</param>
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/// <param name="contentType">Type of the content.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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private bool ShouldCompressResponse(IRequest requestContext, string contentType)
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{
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// It will take some work to support compression with byte range requests
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if (!string.IsNullOrWhiteSpace(requestContext.Headers.Get("Range")))
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{
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return false;
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}
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// Don't compress media
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if (contentType.StartsWith("audio/", StringComparison.OrdinalIgnoreCase) || contentType.StartsWith("video/", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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// Don't compress images
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if (contentType.StartsWith("image/", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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if (contentType.StartsWith("font/", StringComparison.OrdinalIgnoreCase))
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{
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return false;
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}
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if (contentType.StartsWith("application/", StringComparison.OrdinalIgnoreCase))
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{
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if (string.Equals(contentType, "application/x-javascript", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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if (string.Equals(contentType, "application/xml", StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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return false;
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}
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return true;
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}
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/// <summary>
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/// The us culture
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/// </summary>
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private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
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private async Task<IHasHeaders> GetStaticResult(IRequest requestContext, StaticResultOptions options, bool compress)
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{
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var isHeadRequest = options.IsHeadRequest;
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var factoryFn = options.ContentFactory;
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var contentType = options.ContentType;
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var responseHeaders = options.ResponseHeaders;
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|
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var requestedCompressionType = GetCompressionType(requestContext);
|
|
|
|
if (!compress || string.IsNullOrEmpty(requestedCompressionType))
|
|
{
|
|
var rangeHeader = requestContext.Headers.Get("Range");
|
|
|
|
if (!isHeadRequest && !string.IsNullOrWhiteSpace(options.Path))
|
|
{
|
|
return new FileWriter(options.Path, contentType, rangeHeader, _logger, _fileSystem)
|
|
{
|
|
OnComplete = options.OnComplete,
|
|
OnError = options.OnError,
|
|
FileShare = options.FileShare
|
|
};
|
|
}
|
|
|
|
if (!string.IsNullOrWhiteSpace(rangeHeader))
|
|
{
|
|
var stream = await factoryFn().ConfigureAwait(false);
|
|
|
|
return new RangeRequestWriter(rangeHeader, stream, contentType, isHeadRequest, _logger)
|
|
{
|
|
OnComplete = options.OnComplete
|
|
};
|
|
}
|
|
else
|
|
{
|
|
var stream = await factoryFn().ConfigureAwait(false);
|
|
|
|
responseHeaders["Content-Length"] = stream.Length.ToString(UsCulture);
|
|
|
|
if (isHeadRequest)
|
|
{
|
|
stream.Dispose();
|
|
|
|
return GetHttpResult(new byte[] { }, contentType, true);
|
|
}
|
|
|
|
return new StreamWriter(stream, contentType, _logger)
|
|
{
|
|
OnComplete = options.OnComplete,
|
|
OnError = options.OnError
|
|
};
|
|
}
|
|
}
|
|
|
|
using (var stream = await factoryFn().ConfigureAwait(false))
|
|
{
|
|
return await GetCompressedResult(stream, requestedCompressionType, responseHeaders, isHeadRequest, contentType).ConfigureAwait(false);
|
|
}
|
|
}
|
|
|
|
private async Task<IHasHeaders> GetCompressedResult(Stream stream,
|
|
string requestedCompressionType,
|
|
IDictionary<string, string> responseHeaders,
|
|
bool isHeadRequest,
|
|
string contentType)
|
|
{
|
|
using (var reader = new MemoryStream())
|
|
{
|
|
await stream.CopyToAsync(reader).ConfigureAwait(false);
|
|
|
|
reader.Position = 0;
|
|
var content = reader.ToArray();
|
|
|
|
if (content.Length >= 1024)
|
|
{
|
|
content = Compress(content, requestedCompressionType);
|
|
responseHeaders["Content-Encoding"] = requestedCompressionType;
|
|
}
|
|
|
|
responseHeaders["Vary"] = "Accept-Encoding";
|
|
responseHeaders["Content-Length"] = content.Length.ToString(UsCulture);
|
|
|
|
if (isHeadRequest)
|
|
{
|
|
return GetHttpResult(new byte[] { }, contentType, true);
|
|
}
|
|
|
|
return GetHttpResult(content, contentType, true, responseHeaders);
|
|
}
|
|
}
|
|
|
|
private byte[] Compress(byte[] bytes, string compressionType)
|
|
{
|
|
if (compressionType == "deflate")
|
|
return Deflate(bytes);
|
|
|
|
if (compressionType == "gzip")
|
|
return GZip(bytes);
|
|
|
|
throw new NotSupportedException(compressionType);
|
|
}
|
|
|
|
private byte[] Deflate(byte[] bytes)
|
|
{
|
|
// In .NET FX incompat-ville, you can't access compressed bytes without closing DeflateStream
|
|
// Which means we must use MemoryStream since you have to use ToArray() on a closed Stream
|
|
using (var ms = new MemoryStream())
|
|
using (var zipStream = new DeflateStream(ms, CompressionMode.Compress))
|
|
{
|
|
zipStream.Write(bytes, 0, bytes.Length);
|
|
zipStream.Dispose();
|
|
|
|
return ms.ToArray();
|
|
}
|
|
}
|
|
|
|
private byte[] GZip(byte[] buffer)
|
|
{
|
|
using (var ms = new MemoryStream())
|
|
using (var zipStream = new GZipStream(ms, CompressionMode.Compress))
|
|
{
|
|
zipStream.Write(buffer, 0, buffer.Length);
|
|
zipStream.Dispose();
|
|
|
|
return ms.ToArray();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the caching responseHeaders.
|
|
/// </summary>
|
|
private void AddCachingHeaders(IDictionary<string, string> responseHeaders, string cacheKey, DateTime? lastDateModified, TimeSpan? cacheDuration, bool noCache)
|
|
{
|
|
// Don't specify both last modified and Etag, unless caching unconditionally. They are redundant
|
|
// https://developers.google.com/speed/docs/best-practices/caching#LeverageBrowserCaching
|
|
if (lastDateModified.HasValue && (string.IsNullOrEmpty(cacheKey) || cacheDuration.HasValue))
|
|
{
|
|
AddAgeHeader(responseHeaders, lastDateModified);
|
|
responseHeaders["Last-Modified"] = lastDateModified.Value.ToString("r");
|
|
}
|
|
|
|
if (!noCache && cacheDuration.HasValue)
|
|
{
|
|
responseHeaders["Cache-Control"] = "public, max-age=" + Convert.ToInt32(cacheDuration.Value.TotalSeconds);
|
|
}
|
|
else if (!noCache && !string.IsNullOrEmpty(cacheKey))
|
|
{
|
|
responseHeaders["Cache-Control"] = "public";
|
|
}
|
|
else
|
|
{
|
|
responseHeaders["Cache-Control"] = "no-cache, no-store, must-revalidate";
|
|
responseHeaders["pragma"] = "no-cache, no-store, must-revalidate";
|
|
}
|
|
|
|
AddExpiresHeader(responseHeaders, cacheKey, cacheDuration, noCache);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the expires header.
|
|
/// </summary>
|
|
private void AddExpiresHeader(IDictionary<string, string> responseHeaders, string cacheKey, TimeSpan? cacheDuration, bool noCache)
|
|
{
|
|
if (!noCache && cacheDuration.HasValue)
|
|
{
|
|
responseHeaders["Expires"] = DateTime.UtcNow.Add(cacheDuration.Value).ToString("r");
|
|
}
|
|
else if (string.IsNullOrEmpty(cacheKey))
|
|
{
|
|
responseHeaders["Expires"] = "-1";
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the age header.
|
|
/// </summary>
|
|
/// <param name="responseHeaders">The responseHeaders.</param>
|
|
/// <param name="lastDateModified">The last date modified.</param>
|
|
private void AddAgeHeader(IDictionary<string, string> responseHeaders, DateTime? lastDateModified)
|
|
{
|
|
if (lastDateModified.HasValue)
|
|
{
|
|
responseHeaders["Age"] = Convert.ToInt64((DateTime.UtcNow - lastDateModified.Value).TotalSeconds).ToString(CultureInfo.InvariantCulture);
|
|
}
|
|
}
|
|
/// <summary>
|
|
/// Determines whether [is not modified] [the specified cache key].
|
|
/// </summary>
|
|
/// <param name="requestContext">The request context.</param>
|
|
/// <param name="cacheKey">The cache key.</param>
|
|
/// <param name="lastDateModified">The last date modified.</param>
|
|
/// <param name="cacheDuration">Duration of the cache.</param>
|
|
/// <returns><c>true</c> if [is not modified] [the specified cache key]; otherwise, <c>false</c>.</returns>
|
|
private bool IsNotModified(IRequest requestContext, Guid? cacheKey, DateTime? lastDateModified, TimeSpan? cacheDuration)
|
|
{
|
|
//var isNotModified = true;
|
|
|
|
var ifModifiedSinceHeader = requestContext.Headers.Get("If-Modified-Since");
|
|
|
|
if (!string.IsNullOrEmpty(ifModifiedSinceHeader))
|
|
{
|
|
DateTime ifModifiedSince;
|
|
|
|
if (DateTime.TryParse(ifModifiedSinceHeader, out ifModifiedSince))
|
|
{
|
|
if (IsNotModified(ifModifiedSince.ToUniversalTime(), cacheDuration, lastDateModified))
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
var ifNoneMatchHeader = requestContext.Headers.Get("If-None-Match");
|
|
|
|
// Validate If-None-Match
|
|
if ((cacheKey.HasValue || !string.IsNullOrEmpty(ifNoneMatchHeader)))
|
|
{
|
|
Guid ifNoneMatch;
|
|
|
|
ifNoneMatchHeader = (ifNoneMatchHeader ?? string.Empty).Trim('\"');
|
|
|
|
if (Guid.TryParse(ifNoneMatchHeader, out ifNoneMatch))
|
|
{
|
|
if (cacheKey.HasValue && cacheKey.Value == ifNoneMatch)
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether [is not modified] [the specified if modified since].
|
|
/// </summary>
|
|
/// <param name="ifModifiedSince">If modified since.</param>
|
|
/// <param name="cacheDuration">Duration of the cache.</param>
|
|
/// <param name="dateModified">The date modified.</param>
|
|
/// <returns><c>true</c> if [is not modified] [the specified if modified since]; otherwise, <c>false</c>.</returns>
|
|
private bool IsNotModified(DateTime ifModifiedSince, TimeSpan? cacheDuration, DateTime? dateModified)
|
|
{
|
|
if (dateModified.HasValue)
|
|
{
|
|
var lastModified = NormalizeDateForComparison(dateModified.Value);
|
|
ifModifiedSince = NormalizeDateForComparison(ifModifiedSince);
|
|
|
|
return lastModified <= ifModifiedSince;
|
|
}
|
|
|
|
if (cacheDuration.HasValue)
|
|
{
|
|
var cacheExpirationDate = ifModifiedSince.Add(cacheDuration.Value);
|
|
|
|
if (DateTime.UtcNow < cacheExpirationDate)
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// When the browser sends the IfModifiedDate, it's precision is limited to seconds, so this will account for that
|
|
/// </summary>
|
|
/// <param name="date">The date.</param>
|
|
/// <returns>DateTime.</returns>
|
|
private DateTime NormalizeDateForComparison(DateTime date)
|
|
{
|
|
return new DateTime(date.Year, date.Month, date.Day, date.Hour, date.Minute, date.Second, date.Kind);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the response headers.
|
|
/// </summary>
|
|
/// <param name="hasHeaders">The has options.</param>
|
|
/// <param name="responseHeaders">The response headers.</param>
|
|
private void AddResponseHeaders(IHasHeaders hasHeaders, IEnumerable<KeyValuePair<string, string>> responseHeaders)
|
|
{
|
|
foreach (var item in responseHeaders)
|
|
{
|
|
hasHeaders.Headers[item.Key] = item.Value;
|
|
}
|
|
}
|
|
}
|
|
} |