130 lines
4.7 KiB
C#
130 lines
4.7 KiB
C#
using MediaBrowser.Model.Logging;
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using System;
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using System.Globalization;
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using System.Text;
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using Emby.Server.Implementations.HttpServer.SocketSharp;
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using MediaBrowser.Model.Services;
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namespace Emby.Server.Implementations.HttpServer
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{
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public class ResponseFilter
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{
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private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
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private readonly ILogger _logger;
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public ResponseFilter(ILogger logger)
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{
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_logger = logger;
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}
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/// <summary>
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/// Filters the response.
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/// </summary>
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/// <param name="req">The req.</param>
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/// <param name="res">The res.</param>
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/// <param name="dto">The dto.</param>
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public void FilterResponse(IRequest req, IResponse res, object dto)
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{
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// Try to prevent compatibility view
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res.AddHeader("X-UA-Compatible", "IE=Edge");
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res.AddHeader("Access-Control-Allow-Headers", "Content-Type, Authorization, Range, X-MediaBrowser-Token, X-Emby-Authorization");
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res.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, PATCH, OPTIONS");
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res.AddHeader("Access-Control-Allow-Origin", "*");
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var exception = dto as Exception;
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if (exception != null)
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{
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_logger.ErrorException("Error processing request for {0}", exception, req.RawUrl);
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if (!string.IsNullOrEmpty(exception.Message))
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{
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var error = exception.Message.Replace(Environment.NewLine, " ");
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error = RemoveControlCharacters(error);
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res.AddHeader("X-Application-Error-Code", error);
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}
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}
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var vary = "Accept-Encoding";
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var hasHeaders = dto as IHasHeaders;
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var sharpResponse = res as WebSocketSharpResponse;
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if (hasHeaders != null)
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{
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if (!hasHeaders.Headers.ContainsKey("Server"))
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{
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hasHeaders.Headers["Server"] = "Mono-HTTPAPI/1.1, UPnP/1.0 DLNADOC/1.50";
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//hasHeaders.Headers["Server"] = "Mono-HTTPAPI/1.1";
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}
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// Content length has to be explicitly set on on HttpListenerResponse or it won't be happy
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string contentLength;
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if (hasHeaders.Headers.TryGetValue("Content-Length", out contentLength) && !string.IsNullOrEmpty(contentLength))
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{
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var length = long.Parse(contentLength, UsCulture);
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if (length > 0)
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{
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res.SetContentLength(length);
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//var listenerResponse = res.OriginalResponse as HttpListenerResponse;
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//if (listenerResponse != null)
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//{
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// // Disable chunked encoding. Technically this is only needed when using Content-Range, but
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// // anytime we know the content length there's no need for it
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// listenerResponse.SendChunked = false;
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// return;
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//}
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if (sharpResponse != null)
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{
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sharpResponse.SendChunked = false;
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}
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}
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}
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string hasHeadersVary;
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if (hasHeaders.Headers.TryGetValue("Vary", out hasHeadersVary))
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{
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vary = hasHeadersVary;
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}
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hasHeaders.Headers["Vary"] = vary;
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}
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//res.KeepAlive = false;
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// Per Google PageSpeed
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// This instructs the proxies to cache two versions of the resource: one compressed, and one uncompressed.
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// The correct version of the resource is delivered based on the client request header.
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// This is a good choice for applications that are singly homed and depend on public proxies for user locality.
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res.AddHeader("Vary", vary);
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}
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/// <summary>
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/// Removes the control characters.
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/// </summary>
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/// <param name="inString">The in string.</param>
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/// <returns>System.String.</returns>
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public static string RemoveControlCharacters(string inString)
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{
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if (inString == null) return null;
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var newString = new StringBuilder();
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foreach (var ch in inString)
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{
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if (!char.IsControl(ch))
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{
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newString.Append(ch);
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}
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}
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return newString.ToString();
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}
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}
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}
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