jellyfin/MediaBrowser.Common/Net/Handlers/StaticFileHandler.cs

283 lines
9.6 KiB
C#

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using MediaBrowser.Common.Logging;
namespace MediaBrowser.Common.Net.Handlers
{
public class StaticFileHandler : BaseHandler
{
public string Path
{
get
{
return QueryString["path"];
}
}
private bool FileStreamDiscovered = false;
private FileStream _FileStream = null;
private FileStream FileStream
{
get
{
if (!FileStreamDiscovered)
{
try
{
_FileStream = File.OpenRead(Path);
}
catch (FileNotFoundException)
{
StatusCode = 404;
}
catch (DirectoryNotFoundException)
{
StatusCode = 404;
}
catch (UnauthorizedAccessException)
{
StatusCode = 403;
}
finally
{
FileStreamDiscovered = true;
}
}
return _FileStream;
}
}
protected override bool SupportsByteRangeRequests
{
get
{
return true;
}
}
public override bool CompressResponse
{
get
{
string contentType = ContentType;
// Can't compress these
if (IsRangeRequest)
{
return false;
}
// Don't compress media
if (contentType.StartsWith("audio/", StringComparison.OrdinalIgnoreCase) || contentType.StartsWith("video/", StringComparison.OrdinalIgnoreCase))
{
return false;
}
// It will take some work to support compression within this handler
return false;
}
}
protected override long? GetTotalContentLength()
{
try
{
return FileStream.Length;
}
catch
{
return base.GetTotalContentLength();
}
}
protected override DateTime? GetLastDateModified()
{
try
{
return File.GetLastWriteTime(Path);
}
catch
{
return base.GetLastDateModified();
}
}
protected override bool IsAsyncHandler
{
get
{
return true;
}
}
public override string ContentType
{
get
{
return MimeTypes.GetMimeType(Path);
}
}
protected async override void WriteResponseToOutputStream(Stream stream)
{
try
{
if (FileStream != null)
{
if (IsRangeRequest)
{
KeyValuePair<long, long?> requestedRange = RequestedRanges.First();
// If the requested range is "0-" and we know the total length, we can optimize by avoiding having to buffer the content into memory
if (requestedRange.Value == null && TotalContentLength != null)
{
await ServeCompleteRangeRequest(requestedRange, stream);
}
else if (TotalContentLength.HasValue)
{
// This will have to buffer a portion of the content into memory
await ServePartialRangeRequestWithKnownTotalContentLength(requestedRange, stream);
}
else
{
// This will have to buffer the entire content into memory
await ServePartialRangeRequestWithUnknownTotalContentLength(requestedRange, stream);
}
}
else
{
await FileStream.CopyToAsync(stream);
}
}
}
catch (Exception ex)
{
Logger.LogException("WriteResponseToOutputStream", ex);
}
finally
{
if (FileStream != null)
{
FileStream.Dispose();
}
DisposeResponseStream();
}
}
/// <summary>
/// Handles a range request of "bytes=0-"
/// This will serve the complete content and add the content-range header
/// </summary>
private async Task ServeCompleteRangeRequest(KeyValuePair<long, long?> requestedRange, Stream responseStream)
{
long totalContentLength = TotalContentLength.Value;
long rangeStart = requestedRange.Key;
long rangeEnd = totalContentLength - 1;
long rangeLength = 1 + rangeEnd - rangeStart;
// Content-Length is the length of what we're serving, not the original content
HttpListenerContext.Response.ContentLength64 = rangeLength;
HttpListenerContext.Response.Headers["Content-Range"] = string.Format("bytes {0}-{1}/{2}", rangeStart, rangeEnd, totalContentLength);
if (rangeStart > 0)
{
FileStream.Position = rangeStart;
}
await FileStream.CopyToAsync(responseStream);
}
/// <summary>
/// Serves a partial range request where the total content length is not known
/// </summary>
private async Task ServePartialRangeRequestWithUnknownTotalContentLength(KeyValuePair<long, long?> requestedRange, Stream responseStream)
{
// Read the entire stream so that we can determine the length
byte[] bytes = await ReadBytes(FileStream, 0, null);
long totalContentLength = bytes.LongLength;
long rangeStart = requestedRange.Key;
long rangeEnd = requestedRange.Value ?? (totalContentLength - 1);
long rangeLength = 1 + rangeEnd - rangeStart;
// Content-Length is the length of what we're serving, not the original content
HttpListenerContext.Response.ContentLength64 = rangeLength;
HttpListenerContext.Response.Headers["Content-Range"] = string.Format("bytes {0}-{1}/{2}", rangeStart, rangeEnd, totalContentLength);
await responseStream.WriteAsync(bytes, Convert.ToInt32(rangeStart), Convert.ToInt32(rangeLength));
}
/// <summary>
/// Serves a partial range request where the total content length is already known
/// </summary>
private async Task ServePartialRangeRequestWithKnownTotalContentLength(KeyValuePair<long, long?> requestedRange, Stream responseStream)
{
long totalContentLength = TotalContentLength.Value;
long rangeStart = requestedRange.Key;
long rangeEnd = requestedRange.Value ?? (totalContentLength - 1);
long rangeLength = 1 + rangeEnd - rangeStart;
// Only read the bytes we need
byte[] bytes = await ReadBytes(FileStream, Convert.ToInt32(rangeStart), Convert.ToInt32(rangeLength));
// Content-Length is the length of what we're serving, not the original content
HttpListenerContext.Response.ContentLength64 = rangeLength;
HttpListenerContext.Response.Headers["Content-Range"] = string.Format("bytes {0}-{1}/{2}", rangeStart, rangeEnd, totalContentLength);
await responseStream.WriteAsync(bytes, 0, Convert.ToInt32(rangeLength));
}
/// <summary>
/// Reads bytes from a stream
/// </summary>
/// <param name="input">The input stream</param>
/// <param name="start">The starting position</param>
/// <param name="count">The number of bytes to read, or null to read to the end.</param>
private async Task<byte[]> ReadBytes(Stream input, int start, int? count)
{
if (start > 0)
{
input.Position = start;
}
if (count == null)
{
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = await input.ReadAsync(buffer, 0, buffer.Length)) > 0)
{
await ms.WriteAsync(buffer, 0, read);
}
return ms.ToArray();
}
}
else
{
byte[] buffer = new byte[count.Value];
using (MemoryStream ms = new MemoryStream())
{
int read = await input.ReadAsync(buffer, 0, buffer.Length);
await ms.WriteAsync(buffer, 0, read);
return ms.ToArray();
}
}
}
}
}