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