mirror of
https://github.com/jellyfin/jellyfin.git
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250 lines
8 KiB
C#
250 lines
8 KiB
C#
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.Linq;
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using System.Net;
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using System.Runtime.InteropServices;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Services;
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using Microsoft.Extensions.Logging;
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using Microsoft.AspNetCore.Http;
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using Microsoft.Net.Http.Headers;
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namespace Emby.Server.Implementations.HttpServer
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{
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public class FileWriter : IHttpResult
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{
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private static readonly CultureInfo UsCulture = CultureInfo.ReadOnly(new CultureInfo("en-US"));
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private static readonly string[] _skipLogExtensions = {
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".js",
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".html",
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".css"
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};
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private readonly IStreamHelper _streamHelper;
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private readonly ILogger _logger;
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private readonly IFileSystem _fileSystem;
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/// <summary>
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/// The _options
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/// </summary>
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private readonly IDictionary<string, string> _options = new Dictionary<string, string>();
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/// <summary>
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/// The _requested ranges
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/// </summary>
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private List<KeyValuePair<long, long?>> _requestedRanges;
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public FileWriter(string path, string contentType, string rangeHeader, ILogger logger, IFileSystem fileSystem, IStreamHelper streamHelper)
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{
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if (string.IsNullOrEmpty(contentType))
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{
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throw new ArgumentNullException(nameof(contentType));
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}
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_streamHelper = streamHelper;
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_fileSystem = fileSystem;
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Path = path;
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_logger = logger;
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RangeHeader = rangeHeader;
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Headers[HeaderNames.ContentType] = contentType;
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TotalContentLength = fileSystem.GetFileInfo(path).Length;
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Headers[HeaderNames.AcceptRanges] = "bytes";
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if (string.IsNullOrWhiteSpace(rangeHeader))
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{
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Headers[HeaderNames.ContentLength] = TotalContentLength.ToString(CultureInfo.InvariantCulture);
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StatusCode = HttpStatusCode.OK;
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}
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else
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{
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StatusCode = HttpStatusCode.PartialContent;
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SetRangeValues();
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}
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FileShare = FileShareMode.Read;
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Cookies = new List<Cookie>();
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}
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private string RangeHeader { get; set; }
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private bool IsHeadRequest { get; set; }
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private long RangeStart { get; set; }
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private long RangeEnd { get; set; }
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private long RangeLength { get; set; }
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public long TotalContentLength { get; set; }
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public Action OnComplete { get; set; }
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public Action OnError { get; set; }
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public List<Cookie> Cookies { get; private set; }
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public FileShareMode FileShare { get; set; }
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/// <summary>
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/// Gets the options.
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/// </summary>
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/// <value>The options.</value>
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public IDictionary<string, string> Headers => _options;
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public string Path { get; set; }
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/// <summary>
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/// Gets the requested ranges.
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/// </summary>
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/// <value>The requested ranges.</value>
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protected List<KeyValuePair<long, long?>> RequestedRanges
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{
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get
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{
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if (_requestedRanges == null)
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{
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_requestedRanges = new List<KeyValuePair<long, long?>>();
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// Example: bytes=0-,32-63
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var ranges = RangeHeader.Split('=')[1].Split(',');
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foreach (var range in ranges)
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{
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var vals = range.Split('-');
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long start = 0;
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long? end = null;
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if (!string.IsNullOrEmpty(vals[0]))
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{
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start = long.Parse(vals[0], UsCulture);
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}
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if (!string.IsNullOrEmpty(vals[1]))
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{
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end = long.Parse(vals[1], UsCulture);
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}
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_requestedRanges.Add(new KeyValuePair<long, long?>(start, end));
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}
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}
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return _requestedRanges;
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}
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}
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public string ContentType { get; set; }
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public IRequest RequestContext { get; set; }
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public object Response { get; set; }
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public int Status { get; set; }
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public HttpStatusCode StatusCode
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{
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get => (HttpStatusCode)Status;
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set => Status = (int)value;
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}
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/// <summary>
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/// Sets the range values.
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/// </summary>
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private void SetRangeValues()
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{
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var requestedRange = RequestedRanges[0];
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// If the requested range is "0-", we can optimize by just doing a stream copy
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if (!requestedRange.Value.HasValue)
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{
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RangeEnd = TotalContentLength - 1;
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}
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else
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{
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RangeEnd = requestedRange.Value.Value;
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}
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RangeStart = requestedRange.Key;
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RangeLength = 1 + RangeEnd - RangeStart;
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// Content-Length is the length of what we're serving, not the original content
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var lengthString = RangeLength.ToString(CultureInfo.InvariantCulture);
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Headers[HeaderNames.ContentLength] = lengthString;
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var rangeString = $"bytes {RangeStart}-{RangeEnd}/{TotalContentLength}";
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Headers[HeaderNames.ContentRange] = rangeString;
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_logger.LogInformation("Setting range response values for {0}. RangeRequest: {1} Content-Length: {2}, Content-Range: {3}", Path, RangeHeader, lengthString, rangeString);
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}
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public async Task WriteToAsync(HttpResponse response, CancellationToken cancellationToken)
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{
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try
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{
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// Headers only
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if (IsHeadRequest)
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{
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return;
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}
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var path = Path;
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var offset = RangeStart;
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var count = RangeLength;
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if (string.IsNullOrWhiteSpace(RangeHeader) || RangeStart <= 0 && RangeEnd >= TotalContentLength - 1)
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{
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var extension = System.IO.Path.GetExtension(path);
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if (extension == null || !_skipLogExtensions.Contains(extension, StringComparer.OrdinalIgnoreCase))
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{
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_logger.LogDebug("Transmit file {0}", path);
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}
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offset = 0;
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count = 0;
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}
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await TransmitFile(response.Body, path, offset, count, FileShare, cancellationToken).ConfigureAwait(false);
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}
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finally
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{
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OnComplete?.Invoke();
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}
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}
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public async Task TransmitFile(Stream stream, string path, long offset, long count, FileShareMode fileShareMode, CancellationToken cancellationToken)
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{
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var fileOpenOptions = FileOpenOptions.SequentialScan;
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// use non-async filestream along with read due to https://github.com/dotnet/corefx/issues/6039
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if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
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{
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fileOpenOptions |= FileOpenOptions.Asynchronous;
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}
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using (var fs = _fileSystem.GetFileStream(path, FileOpenMode.Open, FileAccessMode.Read, fileShareMode, fileOpenOptions))
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{
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if (offset > 0)
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{
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fs.Position = offset;
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}
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if (count > 0)
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{
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await _streamHelper.CopyToAsync(fs, stream, count, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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await fs.CopyToAsync(stream, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
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}
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}
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}
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}
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}
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