714 lines
26 KiB
C#
714 lines
26 KiB
C#
#pragma warning disable CS1591
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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.Services;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Serialization;
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using MediaBrowser.Model.Services;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Primitives;
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using Microsoft.Net.Http.Headers;
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using IRequest = MediaBrowser.Model.Services.IRequest;
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using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
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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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// Last-Modified and If-Modified-Since must follow strict date format,
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// see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since
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private const string HttpDateFormat = "ddd, dd MMM yyyy HH:mm:ss \"GMT\"";
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// We specifically use en-US culture because both day of week and month names require it
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private static readonly CultureInfo _enUSculture = new CultureInfo("en-US", false);
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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 IStreamHelper _streamHelper;
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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(ILoggerFactory loggerfactory, IFileSystem fileSystem, IJsonSerializer jsonSerializer, IStreamHelper streamHelper)
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{
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_fileSystem = fileSystem;
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_jsonSerializer = jsonSerializer;
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_streamHelper = streamHelper;
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_logger = loggerfactory.CreateLogger("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(IRequest requestContext, byte[] content, string contentType, IDictionary<string, string> responseHeaders = null)
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{
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return GetHttpResult(requestContext, content, contentType, true, responseHeaders);
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}
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public object GetResult(string content, string contentType, IDictionary<string, string> responseHeaders = null)
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{
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return GetHttpResult(null, content, contentType, true, responseHeaders);
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}
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public object GetResult(IRequest requestContext, Stream content, string contentType, IDictionary<string, string> responseHeaders = null)
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{
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return GetHttpResult(requestContext, content, contentType, true, responseHeaders);
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}
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public object GetResult(IRequest requestContext, string content, string contentType, IDictionary<string, string> responseHeaders = null)
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{
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return GetHttpResult(requestContext, 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[HeaderNames.Location] = url;
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var result = new HttpResult(Array.Empty<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(IRequest requestContext, Stream content, string contentType, bool addCachePrevention, IDictionary<string, string> responseHeaders = null)
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{
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var result = new StreamWriter(content, contentType);
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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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if (addCachePrevention && !responseHeaders.TryGetValue(HeaderNames.Expires, out string expires))
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{
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responseHeaders[HeaderNames.Expires] = "0";
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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 HTTP result.
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/// </summary>
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private IHasHeaders GetHttpResult(IRequest requestContext, byte[] content, string contentType, bool addCachePrevention, IDictionary<string, string> responseHeaders = null)
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{
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string compressionType = null;
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bool isHeadRequest = false;
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if (requestContext != null)
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{
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compressionType = GetCompressionType(requestContext, content, contentType);
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isHeadRequest = string.Equals(requestContext.Verb, "head", StringComparison.OrdinalIgnoreCase);
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}
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IHasHeaders result;
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if (string.IsNullOrEmpty(compressionType))
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{
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var contentLength = content.Length;
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if (isHeadRequest)
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{
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content = Array.Empty<byte>();
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}
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result = new StreamWriter(content, contentType, contentLength);
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}
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else
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{
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result = GetCompressedResult(content, compressionType, responseHeaders, isHeadRequest, contentType);
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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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if (addCachePrevention && !responseHeaders.TryGetValue(HeaderNames.Expires, out string _))
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{
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responseHeaders[HeaderNames.Expires] = "0";
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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 HTTP result.
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/// </summary>
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private IHasHeaders GetHttpResult(IRequest requestContext, string 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 bytes = Encoding.UTF8.GetBytes(content);
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var compressionType = requestContext == null ? null : GetCompressionType(requestContext, bytes, contentType);
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var isHeadRequest = requestContext == null ? false : string.Equals(requestContext.Verb, "head", StringComparison.OrdinalIgnoreCase);
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if (string.IsNullOrEmpty(compressionType))
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{
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var contentLength = bytes.Length;
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if (isHeadRequest)
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{
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bytes = Array.Empty<byte>();
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}
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result = new StreamWriter(bytes, contentType, contentLength);
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}
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else
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{
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result = GetCompressedResult(bytes, compressionType, responseHeaders, isHeadRequest, contentType);
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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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if (addCachePrevention && !responseHeaders.TryGetValue(HeaderNames.Expires, out string _))
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{
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responseHeaders[HeaderNames.Expires] = "0";
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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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public object GetResult<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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if (result == null)
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{
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throw new ArgumentNullException(nameof(result));
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}
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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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responseHeaders[HeaderNames.Expires] = "0";
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return ToOptimizedResultInternal(requestContext, result, responseHeaders);
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}
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private string GetCompressionType(IRequest request, byte[] content, string responseContentType)
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{
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if (responseContentType == null)
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{
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return null;
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}
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// Per apple docs, hls manifests must be compressed
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if (!responseContentType.StartsWith("text/", StringComparison.OrdinalIgnoreCase) &&
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responseContentType.IndexOf("json", StringComparison.OrdinalIgnoreCase) == -1 &&
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responseContentType.IndexOf("javascript", StringComparison.OrdinalIgnoreCase) == -1 &&
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responseContentType.IndexOf("xml", StringComparison.OrdinalIgnoreCase) == -1 &&
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responseContentType.IndexOf("application/x-mpegURL", StringComparison.OrdinalIgnoreCase) == -1)
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{
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return null;
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}
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if (content.Length < 1024)
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{
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return null;
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}
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return GetCompressionType(request);
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}
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private static string GetCompressionType(IRequest request)
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{
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var acceptEncoding = request.Headers[HeaderNames.AcceptEncoding].ToString();
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if (string.IsNullOrEmpty(acceptEncoding))
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{
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//if (_brotliCompressor != null && acceptEncoding.IndexOf("br", StringComparison.OrdinalIgnoreCase) != -1)
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// return "br";
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if (acceptEncoding.IndexOf("deflate", StringComparison.OrdinalIgnoreCase) != -1)
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return "deflate";
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if (acceptEncoding.IndexOf("gzip", StringComparison.OrdinalIgnoreCase) != -1)
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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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return ToOptimizedResultInternal(request, dto);
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}
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private object ToOptimizedResultInternal<T>(IRequest request, T dto, IDictionary<string, string> responseHeaders = null)
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{
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// TODO: @bond use Span and .Equals
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var contentType = request.ResponseContentType?.Split(';')[0].Trim().ToLowerInvariant();
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switch (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 GetHttpResult(request, SerializeToXmlString(dto), contentType, false, responseHeaders);
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case "application/json":
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case "text/json":
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return GetHttpResult(request, _jsonSerializer.SerializeToString(dto), contentType, false, responseHeaders);
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default:
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break;
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}
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var isHeadRequest = string.Equals(request.Verb, "head", StringComparison.OrdinalIgnoreCase);
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var ms = new MemoryStream();
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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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if (isHeadRequest)
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{
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using (ms)
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{
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return GetHttpResult(request, Array.Empty<byte>(), contentType, true, responseHeaders);
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}
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}
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return GetHttpResult(request, ms, contentType, true, responseHeaders);
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}
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private IHasHeaders GetCompressedResult(byte[] content,
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string requestedCompressionType,
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IDictionary<string, string> responseHeaders,
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bool isHeadRequest,
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string contentType)
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{
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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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content = Compress(content, requestedCompressionType);
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responseHeaders[HeaderNames.ContentEncoding] = requestedCompressionType;
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responseHeaders[HeaderNames.Vary] = HeaderNames.AcceptEncoding;
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var contentLength = content.Length;
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if (isHeadRequest)
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{
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var result = new StreamWriter(Array.Empty<byte>(), contentType, contentLength);
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AddResponseHeaders(result, responseHeaders);
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return result;
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}
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else
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{
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var result = new StreamWriter(content, contentType, contentLength);
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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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private byte[] Compress(byte[] bytes, string compressionType)
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{
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if (string.Equals(compressionType, "deflate", StringComparison.OrdinalIgnoreCase))
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{
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return Deflate(bytes);
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}
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if (string.Equals(compressionType, "gzip", StringComparison.OrdinalIgnoreCase))
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{
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return GZip(bytes);
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}
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throw new NotSupportedException(compressionType);
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}
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private static byte[] Deflate(byte[] bytes)
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{
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// In .NET FX incompat-ville, you can't access compressed bytes without closing DeflateStream
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// Which means we must use MemoryStream since you have to use ToArray() on a closed Stream
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using (var ms = new MemoryStream())
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using (var zipStream = new DeflateStream(ms, CompressionMode.Compress))
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{
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zipStream.Write(bytes, 0, bytes.Length);
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zipStream.Dispose();
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return ms.ToArray();
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}
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}
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private static byte[] GZip(byte[] buffer)
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{
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using (var ms = new MemoryStream())
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using (var zipStream = new GZipStream(ms, CompressionMode.Compress))
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{
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zipStream.Write(buffer, 0, buffer.Length);
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zipStream.Dispose();
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return ms.ToArray();
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}
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}
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private static 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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using (var reader = new StreamReader(ms))
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{
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return reader.ReadToEnd();
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}
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}
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}
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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, StaticResultOptions options)
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{
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bool noCache = (requestContext.Headers[HeaderNames.CacheControl].ToString()).IndexOf("no-cache", StringComparison.OrdinalIgnoreCase) != -1;
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AddCachingHeaders(responseHeaders, options.CacheDuration, noCache, options.DateLastModified);
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if (!noCache)
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{
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if (!DateTime.TryParseExact(requestContext.Headers[HeaderNames.IfModifiedSince], HttpDateFormat, _enUSculture, DateTimeStyles.AssumeUniversal, out var ifModifiedSinceHeader))
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{
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_logger.LogDebug("Failed to parse If-Modified-Since header date: {0}", requestContext.Headers[HeaderNames.IfModifiedSince]);
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return null;
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}
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if (IsNotModified(ifModifiedSinceHeader, options.CacheDuration, options.DateLastModified))
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{
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AddAgeHeader(responseHeaders, options.DateLastModified);
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var result = new HttpResult(Array.Empty<byte>(), options.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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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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FileShare fileShare = FileShare.Read)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException(nameof(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, 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 ArgumentException("Path can't be empty.", nameof(options));
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}
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if (fileShare != FileShare.Read && fileShare != FileShare.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.IsNullOrEmpty(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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options.ContentFactory = () => Task.FromResult(GetFileStream(path, fileShare));
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options.ResponseHeaders = options.ResponseHeaders ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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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, FileShare fileShare)
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{
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return new FileStream(path, FileMode.Open, FileAccess.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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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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options.ResponseHeaders = options.ResponseHeaders ?? new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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var contentType = options.ContentType;
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if (!StringValues.IsNullOrEmpty(requestContext.Headers[HeaderNames.IfModifiedSince]))
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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, options.ResponseHeaders, options);
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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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}
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// TODO: We don't really need the option value
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var isHeadRequest = options.IsHeadRequest || string.Equals(requestContext.Verb, "HEAD", StringComparison.OrdinalIgnoreCase);
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var factoryFn = options.ContentFactory;
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var responseHeaders = options.ResponseHeaders;
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AddCachingHeaders(responseHeaders, options.CacheDuration, false, options.DateLastModified);
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AddAgeHeader(responseHeaders, options.DateLastModified);
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var rangeHeader = requestContext.Headers[HeaderNames.Range];
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|
if (!isHeadRequest && !string.IsNullOrEmpty(options.Path))
|
|
{
|
|
var hasHeaders = new FileWriter(options.Path, contentType, rangeHeader, _logger, _fileSystem, _streamHelper)
|
|
{
|
|
OnComplete = options.OnComplete,
|
|
OnError = options.OnError,
|
|
FileShare = options.FileShare
|
|
};
|
|
|
|
AddResponseHeaders(hasHeaders, options.ResponseHeaders);
|
|
return hasHeaders;
|
|
}
|
|
|
|
var stream = await factoryFn().ConfigureAwait(false);
|
|
|
|
var totalContentLength = options.ContentLength;
|
|
if (!totalContentLength.HasValue)
|
|
{
|
|
try
|
|
{
|
|
totalContentLength = stream.Length;
|
|
}
|
|
catch (NotSupportedException)
|
|
{
|
|
|
|
}
|
|
}
|
|
|
|
if (!string.IsNullOrWhiteSpace(rangeHeader) && totalContentLength.HasValue)
|
|
{
|
|
var hasHeaders = new RangeRequestWriter(rangeHeader, totalContentLength.Value, stream, contentType, isHeadRequest, _logger)
|
|
{
|
|
OnComplete = options.OnComplete
|
|
};
|
|
|
|
AddResponseHeaders(hasHeaders, options.ResponseHeaders);
|
|
return hasHeaders;
|
|
}
|
|
else
|
|
{
|
|
if (totalContentLength.HasValue)
|
|
{
|
|
responseHeaders["Content-Length"] = totalContentLength.Value.ToString(CultureInfo.InvariantCulture);
|
|
}
|
|
|
|
if (isHeadRequest)
|
|
{
|
|
using (stream)
|
|
{
|
|
return GetHttpResult(requestContext, Array.Empty<byte>(), contentType, true, responseHeaders);
|
|
}
|
|
}
|
|
|
|
var hasHeaders = new StreamWriter(stream, contentType)
|
|
{
|
|
OnComplete = options.OnComplete,
|
|
OnError = options.OnError
|
|
};
|
|
|
|
AddResponseHeaders(hasHeaders, options.ResponseHeaders);
|
|
return hasHeaders;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the caching responseHeaders.
|
|
/// </summary>
|
|
private void AddCachingHeaders(IDictionary<string, string> responseHeaders, TimeSpan? cacheDuration,
|
|
bool noCache, DateTime? lastModifiedDate)
|
|
{
|
|
if (noCache)
|
|
{
|
|
responseHeaders[HeaderNames.CacheControl] = "no-cache, no-store, must-revalidate";
|
|
responseHeaders[HeaderNames.Pragma] = "no-cache, no-store, must-revalidate";
|
|
return;
|
|
}
|
|
|
|
if (cacheDuration.HasValue)
|
|
{
|
|
responseHeaders[HeaderNames.CacheControl] = "public, max-age=" + cacheDuration.Value.TotalSeconds;
|
|
}
|
|
else
|
|
{
|
|
responseHeaders[HeaderNames.CacheControl] = "public";
|
|
}
|
|
|
|
if (lastModifiedDate.HasValue)
|
|
{
|
|
responseHeaders[HeaderNames.LastModified] = lastModifiedDate.Value.ToUniversalTime().ToString(HttpDateFormat, _enUSculture);
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds the age header.
|
|
/// </summary>
|
|
/// <param name="responseHeaders">The responseHeaders.</param>
|
|
/// <param name="lastDateModified">The last date modified.</param>
|
|
private static void AddAgeHeader(IDictionary<string, string> responseHeaders, DateTime? lastDateModified)
|
|
{
|
|
if (lastDateModified.HasValue)
|
|
{
|
|
responseHeaders[HeaderNames.Age] = Convert.ToInt64((DateTime.UtcNow - lastDateModified.Value).TotalSeconds).ToString(CultureInfo.InvariantCulture);
|
|
}
|
|
}
|
|
|
|
/// <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 static 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 static void AddResponseHeaders(IHasHeaders hasHeaders, IEnumerable<KeyValuePair<string, string>> responseHeaders)
|
|
{
|
|
foreach (var item in responseHeaders)
|
|
{
|
|
hasHeaders.Headers[item.Key] = item.Value;
|
|
}
|
|
}
|
|
}
|
|
}
|