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using System;
using System.Globalization;
using System.Text;
using MediaBrowser.Controller.Net;
using MediaBrowser.Model.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;
namespace Emby.Server.Implementations.HttpServer
{
/// <summary>
/// Class ResponseFilter.
/// </summary>
public class ResponseFilter
{
private readonly IHttpServer _server;
private readonly ILogger _logger;
/// <summary>
/// Initializes a new instance of the <see cref="ResponseFilter"/> class.
/// </summary>
/// <param name="server">The HTTP server.</param>
/// <param name="logger">The logger.</param>
public ResponseFilter(IHttpServer server, ILogger logger)
{
_server = server;
_logger = logger;
}
/// <summary>
/// Filters the response.
/// </summary>
/// <param name="req">The req.</param>
/// <param name="res">The res.</param>
/// <param name="dto">The dto.</param>
public void FilterResponse(IRequest req, HttpResponse res, object dto)
{
foreach(var (key, value) in _server.GetDefaultCorsHeaders(req))
{
res.Headers.Add(key, value);
}
// Try to prevent compatibility view
res.Headers["Access-Control-Allow-Headers"] = ("Accept, Accept-Language, Authorization, Cache-Control, " +
"Content-Disposition, Content-Encoding, Content-Language, Content-Length, Content-MD5, Content-Range, " +
"Content-Type, Cookie, Date, Host, If-Match, If-Modified-Since, If-None-Match, If-Unmodified-Since, " +
"Origin, OriginToken, Pragma, Range, Slug, Transfer-Encoding, Want-Digest, X-MediaBrowser-Token, " +
"X-Emby-Authorization");
if (dto is Exception exception)
{
_logger.LogError(exception, "Error processing request for {RawUrl}", req.RawUrl);
if (!string.IsNullOrEmpty(exception.Message))
{
var error = exception.Message.Replace(Environment.NewLine, " ", StringComparison.Ordinal);
error = RemoveControlCharacters(error);
res.Headers.Add("X-Application-Error-Code", error);
}
}
if (dto is IHasHeaders hasHeaders)
{
if (!hasHeaders.Headers.ContainsKey(HeaderNames.Server))
{
hasHeaders.Headers[HeaderNames.Server] = "Microsoft-NetCore/2.0, UPnP/1.0 DLNADOC/1.50";
}
// Content length has to be explicitly set on on HttpListenerResponse or it won't be happy
if (hasHeaders.Headers.TryGetValue(HeaderNames.ContentLength, out string contentLength)
&& !string.IsNullOrEmpty(contentLength))
{
var length = long.Parse(contentLength, CultureInfo.InvariantCulture);
if (length > 0)
{
res.ContentLength = length;
}
}
}
}
/// <summary>
/// Removes the control characters.
/// </summary>
/// <param name="inString">The in string.</param>
/// <returns>System.String.</returns>
public static string RemoveControlCharacters(string inString)
{
if (inString == null)
{
return null;
}
else if (inString.Length == 0)
{
return inString;
}
var newString = new StringBuilder(inString.Length);
foreach (var ch in inString)
{
if (!char.IsControl(ch))
{
newString.Append(ch);
}
}
return newString.ToString();
}
}
}
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