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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Services;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.HttpServer
{
public class FileWriter : IHttpResult
{
private ILogger Logger { get; set; }
private string RangeHeader { get; set; }
private bool IsHeadRequest { get; set; }
private long RangeStart { get; set; }
private long RangeEnd { get; set; }
private long RangeLength { get; set; }
private long TotalContentLength { get; set; }
public Action OnComplete { get; set; }
public Action OnError { get; set; }
private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
public List<Cookie> Cookies { get; private set; }
public FileShareMode FileShare { get; set; }
/// <summary>
/// The _options
/// </summary>
private readonly IDictionary<string, string> _options = new Dictionary<string, string>();
/// <summary>
/// Gets the options.
/// </summary>
/// <value>The options.</value>
public IDictionary<string, string> Headers => _options;
public string Path { get; set; }
public FileWriter(string path, string contentType, string rangeHeader, ILogger logger, IFileSystem fileSystem)
{
if (string.IsNullOrEmpty(contentType))
{
throw new ArgumentNullException(nameof(contentType));
}
Path = path;
Logger = logger;
RangeHeader = rangeHeader;
Headers["Content-Type"] = contentType;
TotalContentLength = fileSystem.GetFileInfo(path).Length;
Headers["Accept-Ranges"] = "bytes";
if (string.IsNullOrWhiteSpace(rangeHeader))
{
Headers["Content-Length"] = TotalContentLength.ToString(UsCulture);
StatusCode = HttpStatusCode.OK;
}
else
{
StatusCode = HttpStatusCode.PartialContent;
SetRangeValues();
}
FileShare = FileShareMode.Read;
Cookies = new List<Cookie>();
}
/// <summary>
/// Sets the range values.
/// </summary>
private void SetRangeValues()
{
var requestedRange = RequestedRanges[0];
// If the requested range is "0-", we can optimize by just doing a stream copy
if (!requestedRange.Value.HasValue)
{
RangeEnd = TotalContentLength - 1;
}
else
{
RangeEnd = requestedRange.Value.Value;
}
RangeStart = requestedRange.Key;
RangeLength = 1 + RangeEnd - RangeStart;
// Content-Length is the length of what we're serving, not the original content
var lengthString = RangeLength.ToString(UsCulture);
Headers["Content-Length"] = lengthString;
var rangeString = string.Format("bytes {0}-{1}/{2}", RangeStart, RangeEnd, TotalContentLength);
Headers["Content-Range"] = rangeString;
Logger.LogInformation("Setting range response values for {0}. RangeRequest: {1} Content-Length: {2}, Content-Range: {3}", Path, RangeHeader, lengthString, rangeString);
}
/// <summary>
/// The _requested ranges
/// </summary>
private List<KeyValuePair<long, long?>> _requestedRanges;
/// <summary>
/// Gets the requested ranges.
/// </summary>
/// <value>The requested ranges.</value>
protected List<KeyValuePair<long, long?>> RequestedRanges
{
get
{
if (_requestedRanges == null)
{
_requestedRanges = new List<KeyValuePair<long, long?>>();
// Example: bytes=0-,32-63
var ranges = RangeHeader.Split('=')[1].Split(',');
foreach (var range in ranges)
{
var vals = range.Split('-');
long start = 0;
long? end = null;
if (!string.IsNullOrEmpty(vals[0]))
{
start = long.Parse(vals[0], UsCulture);
}
if (!string.IsNullOrEmpty(vals[1]))
{
end = long.Parse(vals[1], UsCulture);
}
_requestedRanges.Add(new KeyValuePair<long, long?>(start, end));
}
}
return _requestedRanges;
}
}
private string[] SkipLogExtensions = new string[]
{
".js",
".html",
".css"
};
public async Task WriteToAsync(IResponse response, CancellationToken cancellationToken)
{
try
{
// Headers only
if (IsHeadRequest)
{
return;
}
var path = Path;
if (string.IsNullOrWhiteSpace(RangeHeader) || (RangeStart <= 0 && RangeEnd >= TotalContentLength - 1))
{
var extension = System.IO.Path.GetExtension(path);
if (extension == null || !SkipLogExtensions.Contains(extension, StringComparer.OrdinalIgnoreCase))
{
Logger.LogDebug("Transmit file {0}", path);
}
//var count = FileShare == FileShareMode.ReadWrite ? TotalContentLength : 0;
await response.TransmitFile(path, 0, 0, FileShare, cancellationToken).ConfigureAwait(false);
return;
}
await response.TransmitFile(path, RangeStart, RangeLength, FileShare, cancellationToken).ConfigureAwait(false);
}
finally
{
if (OnComplete != null)
{
OnComplete();
}
}
}
public string ContentType { get; set; }
public IRequest RequestContext { get; set; }
public object Response { get; set; }
public int Status { get; set; }
public HttpStatusCode StatusCode
{
get => (HttpStatusCode)Status;
set => Status = (int)value;
}
public string StatusDescription { get; set; }
}
}
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