jellyfin/Emby.Server.Implementations/HttpServer/StreamWriter.cs
2020-08-09 14:08:55 +02:00

121 lines
3.6 KiB
C#

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Model.Services;
using Microsoft.Net.Http.Headers;
namespace Emby.Server.Implementations.HttpServer
{
/// <summary>
/// Class StreamWriter.
/// </summary>
public class StreamWriter : IAsyncStreamWriter, IHasHeaders
{
/// <summary>
/// The options.
/// </summary>
private readonly IDictionary<string, string> _options = new Dictionary<string, string>();
/// <summary>
/// Initializes a new instance of the <see cref="StreamWriter" /> class.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="contentType">Type of the content.</param>
public StreamWriter(Stream source, string contentType)
{
if (string.IsNullOrEmpty(contentType))
{
throw new ArgumentNullException(nameof(contentType));
}
SourceStream = source;
Headers["Content-Type"] = contentType;
if (source.CanSeek)
{
Headers[HeaderNames.ContentLength] = source.Length.ToString(CultureInfo.InvariantCulture);
}
Headers[HeaderNames.ContentType] = contentType;
}
/// <summary>
/// Initializes a new instance of the <see cref="StreamWriter"/> class.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="contentType">Type of the content.</param>
/// <param name="contentLength">The content length.</param>
public StreamWriter(byte[] source, string contentType, int contentLength)
{
if (string.IsNullOrEmpty(contentType))
{
throw new ArgumentNullException(nameof(contentType));
}
SourceBytes = source;
Headers[HeaderNames.ContentLength] = contentLength.ToString(CultureInfo.InvariantCulture);
Headers[HeaderNames.ContentType] = contentType;
}
/// <summary>
/// Gets or sets the source stream.
/// </summary>
/// <value>The source stream.</value>
private Stream SourceStream { get; set; }
private byte[] SourceBytes { get; set; }
/// <summary>
/// Gets the options.
/// </summary>
/// <value>The options.</value>
public IDictionary<string, string> Headers => _options;
/// <summary>
/// Fires when complete.
/// </summary>
public Action OnComplete { get; set; }
/// <summary>
/// Fires when an error occours.
/// </summary>
public Action OnError { get; set; }
/// <inheritdoc />
public async Task WriteToAsync(Stream responseStream, CancellationToken cancellationToken)
{
try
{
var bytes = SourceBytes;
if (bytes != null)
{
await responseStream.WriteAsync(bytes, 0, bytes.Length, cancellationToken).ConfigureAwait(false);
}
else
{
using (var src = SourceStream)
{
await src.CopyToAsync(responseStream, cancellationToken).ConfigureAwait(false);
}
}
}
catch
{
OnError?.Invoke();
throw;
}
finally
{
OnComplete?.Invoke();
}
}
}
}