mirror of
https://github.com/jellyfin/jellyfin.git
synced 2024-09-06 19:37:55 +02:00
Add Argument*Exceptions now use proper nameof operators. Added exception messages to quite a few Argument*Exceptions. Fixed rethorwing to be proper syntax. Added a ton of null checkes. (This is only a start, there are about 500 places that need proper null handling) Added some TODOs to log certain exceptions. Fix sln again. Fixed all AssemblyInfo's and added proper copyright (where I could find them) We live in *current year*. Fixed the use of braces. Fixed a ton of properties, and made a fair amount of functions static that should be and can be static. Made more Methods that should be static static. You can now use static to find bad functions! Removed unused variable. And added one more proper XML comment.
797 lines
24 KiB
C#
797 lines
24 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Net;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Cryptography;
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using MediaBrowser.Model.IO;
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using SocketHttpListener.Net.WebSockets;
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using SocketHttpListener.Primitives;
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using HttpStatusCode = SocketHttpListener.Net.HttpStatusCode;
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using System.Net.Sockets;
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using WebSocketState = System.Net.WebSockets.WebSocketState;
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namespace SocketHttpListener
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{
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/// <summary>
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/// Implements the WebSocket interface.
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/// </summary>
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/// <remarks>
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/// The WebSocket class provides a set of methods and properties for two-way communication using
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/// the WebSocket protocol (<see href="http://tools.ietf.org/html/rfc6455">RFC 6455</see>).
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/// </remarks>
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public class WebSocket : IDisposable
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{
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#region Private Fields
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private string _base64Key;
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private Action _closeContext;
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private CompressionMethod _compression;
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private WebSocketContext _context;
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private CookieCollection _cookies;
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private AutoResetEvent _exitReceiving;
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private object _forConn;
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private object _forEvent;
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private object _forMessageEventQueue;
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private object _forSend;
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private const string _guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
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private Func<WebSocketContext, string>
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_handshakeRequestChecker;
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private Queue<MessageEventArgs> _messageEventQueue;
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private uint _nonceCount;
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private string _origin;
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private bool _preAuth;
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private string _protocol;
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private string[] _protocols;
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private Uri _proxyUri;
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private volatile WebSocketState _readyState;
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private AutoResetEvent _receivePong;
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private bool _secure;
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private Stream _stream;
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private Uri _uri;
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private const string _version = "13";
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#endregion
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#region Internal Fields
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internal const int FragmentLength = 1016; // Max value is int.MaxValue - 14.
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#endregion
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#region Internal Constructors
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// As server
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internal WebSocket(string protocol)
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{
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_protocol = protocol;
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}
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public void SetContext(HttpListenerWebSocketContext context, Action closeContextFn, Stream stream)
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{
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_context = context;
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_closeContext = closeContextFn;
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_secure = context.IsSecureConnection;
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_stream = stream;
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init();
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}
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public static TimeSpan DefaultKeepAliveInterval
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{
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// In the .NET Framework, this pulls the value from a P/Invoke. Here we just hardcode it to a reasonable default.
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get { return TimeSpan.FromSeconds(30); }
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}
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#endregion
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/// <summary>
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/// Gets the state of the WebSocket connection.
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/// </summary>
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/// <value>
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/// One of the <see cref="WebSocketState"/> enum values, indicates the state of the WebSocket
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/// connection. The default value is <see cref="WebSocketState.Connecting"/>.
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/// </value>
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public WebSocketState ReadyState
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{
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get
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{
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return _readyState;
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}
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}
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#region Public Events
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/// <summary>
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/// Occurs when the WebSocket connection has been closed.
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/// </summary>
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public event EventHandler<CloseEventArgs> OnClose;
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/// <summary>
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/// Occurs when the <see cref="WebSocket"/> gets an error.
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/// </summary>
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public event EventHandler<ErrorEventArgs> OnError;
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/// <summary>
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/// Occurs when the <see cref="WebSocket"/> receives a message.
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/// </summary>
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public event EventHandler<MessageEventArgs> OnMessage;
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/// <summary>
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/// Occurs when the WebSocket connection has been established.
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/// </summary>
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public event EventHandler OnOpen;
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#endregion
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#region Private Methods
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private void close(CloseStatusCode code, string reason, bool wait)
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{
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close(new PayloadData(((ushort)code).Append(reason)), !code.IsReserved(), wait);
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}
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private void close(PayloadData payload, bool send, bool wait)
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{
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lock (_forConn)
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{
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if (_readyState == WebSocketState.CloseSent || _readyState == WebSocketState.Closed)
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{
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return;
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}
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_readyState = WebSocketState.CloseSent;
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}
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var e = new CloseEventArgs(payload);
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e.WasClean =
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closeHandshake(
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send ? WebSocketFrame.CreateCloseFrame(Mask.Unmask, payload).ToByteArray() : null,
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wait ? 1000 : 0);
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_readyState = WebSocketState.Closed;
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try
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{
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OnClose.Emit(this, e);
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}
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catch (Exception ex)
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{
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error("An exception has occurred while OnClose.", ex);
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}
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}
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private bool closeHandshake(byte[] frameAsBytes, int millisecondsTimeout)
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{
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var sent = frameAsBytes != null && writeBytes(frameAsBytes);
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var received =
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millisecondsTimeout == 0 ||
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(sent && _exitReceiving != null && _exitReceiving.WaitOne(millisecondsTimeout));
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closeServerResources();
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if (_receivePong != null)
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{
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_receivePong.Dispose();
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_receivePong = null;
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}
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if (_exitReceiving != null)
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{
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_exitReceiving.Dispose();
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_exitReceiving = null;
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}
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var result = sent && received;
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return result;
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}
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// As server
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private void closeServerResources()
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{
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if (_closeContext == null)
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return;
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try
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{
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_closeContext();
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}
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catch (SocketException)
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{
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// it could be unable to send the handshake response
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}
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_closeContext = null;
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_stream = null;
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_context = null;
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}
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private bool concatenateFragmentsInto(Stream dest)
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{
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while (true)
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{
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var frame = WebSocketFrame.Read(_stream, true);
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if (frame.IsFinal)
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{
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/* FINAL */
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// CONT
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if (frame.IsContinuation)
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{
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dest.WriteBytes(frame.PayloadData.ApplicationData);
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break;
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}
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// PING
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if (frame.IsPing)
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{
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processPingFrame(frame);
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continue;
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}
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// PONG
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if (frame.IsPong)
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{
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processPongFrame(frame);
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continue;
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}
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// CLOSE
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if (frame.IsClose)
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return processCloseFrame(frame);
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}
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else
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{
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/* MORE */
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// CONT
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if (frame.IsContinuation)
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{
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dest.WriteBytes(frame.PayloadData.ApplicationData);
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continue;
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}
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}
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// ?
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return processUnsupportedFrame(
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frame,
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CloseStatusCode.IncorrectData,
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"An incorrect data has been received while receiving fragmented data.");
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}
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return true;
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}
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// As server
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private HttpResponse createHandshakeCloseResponse(HttpStatusCode code)
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{
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var res = HttpResponse.CreateCloseResponse(code);
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res.Headers["Sec-WebSocket-Version"] = _version;
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return res;
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}
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private MessageEventArgs dequeueFromMessageEventQueue()
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{
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lock (_forMessageEventQueue)
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return _messageEventQueue.Count > 0
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? _messageEventQueue.Dequeue()
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: null;
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}
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private void enqueueToMessageEventQueue(MessageEventArgs e)
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{
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lock (_forMessageEventQueue)
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_messageEventQueue.Enqueue(e);
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}
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private void error(string message, Exception exception)
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{
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try
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{
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if (exception != null)
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{
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message += ". Exception.Message: " + exception.Message;
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}
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OnError.Emit(this, new ErrorEventArgs(message));
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}
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catch (Exception)
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{
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}
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}
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private void error(string message)
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{
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try
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{
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OnError.Emit(this, new ErrorEventArgs(message));
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}
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catch (Exception)
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{
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}
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}
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private void init()
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{
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_compression = CompressionMethod.None;
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_cookies = new CookieCollection();
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_forConn = new object();
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_forEvent = new object();
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_forSend = new object();
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_messageEventQueue = new Queue<MessageEventArgs>();
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_forMessageEventQueue = ((ICollection)_messageEventQueue).SyncRoot;
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_readyState = WebSocketState.Connecting;
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}
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private void open()
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{
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try
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{
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startReceiving();
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lock (_forEvent)
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{
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try
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{
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if (OnOpen != null)
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{
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OnOpen(this, EventArgs.Empty);
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}
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}
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catch (Exception ex)
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{
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processException(ex, "An exception has occurred while OnOpen.");
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}
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}
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}
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catch (Exception ex)
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{
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processException(ex, "An exception has occurred while opening.");
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}
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}
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private bool processCloseFrame(WebSocketFrame frame)
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{
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var payload = frame.PayloadData;
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close(payload, !payload.ContainsReservedCloseStatusCode, false);
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return false;
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}
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private bool processDataFrame(WebSocketFrame frame)
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{
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var e = frame.IsCompressed
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? new MessageEventArgs(
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frame.Opcode, frame.PayloadData.ApplicationData.Decompress(_compression))
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: new MessageEventArgs(frame.Opcode, frame.PayloadData);
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enqueueToMessageEventQueue(e);
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return true;
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}
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private void processException(Exception exception, string message)
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{
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var code = CloseStatusCode.Abnormal;
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var reason = message;
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if (exception is WebSocketException)
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{
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var wsex = (WebSocketException)exception;
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code = wsex.Code;
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reason = wsex.Message;
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}
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error(message ?? code.GetMessage(), exception);
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if (_readyState == WebSocketState.Connecting)
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Close(HttpStatusCode.BadRequest);
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else
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close(code, reason ?? code.GetMessage(), false);
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}
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private bool processFragmentedFrame(WebSocketFrame frame)
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{
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return frame.IsContinuation // Not first fragment
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? true
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: processFragments(frame);
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}
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private bool processFragments(WebSocketFrame first)
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{
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using (var buff = new MemoryStream())
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{
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buff.WriteBytes(first.PayloadData.ApplicationData);
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if (!concatenateFragmentsInto(buff))
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return false;
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byte[] data;
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if (_compression != CompressionMethod.None)
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{
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data = buff.DecompressToArray(_compression);
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}
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else
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{
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data = buff.ToArray();
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}
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enqueueToMessageEventQueue(new MessageEventArgs(first.Opcode, data));
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return true;
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}
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}
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private bool processPingFrame(WebSocketFrame frame)
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{
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return true;
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}
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private bool processPongFrame(WebSocketFrame frame)
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{
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_receivePong.Set();
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return true;
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}
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private bool processUnsupportedFrame(WebSocketFrame frame, CloseStatusCode code, string reason)
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{
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processException(new WebSocketException(code, reason), null);
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return false;
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}
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private bool processWebSocketFrame(WebSocketFrame frame)
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{
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return frame.IsCompressed && _compression == CompressionMethod.None
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? processUnsupportedFrame(
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frame,
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CloseStatusCode.IncorrectData,
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"A compressed data has been received without available decompression method.")
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: frame.IsFragmented
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? processFragmentedFrame(frame)
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: frame.IsData
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? processDataFrame(frame)
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: frame.IsPing
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? processPingFrame(frame)
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: frame.IsPong
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? processPongFrame(frame)
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: frame.IsClose
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? processCloseFrame(frame)
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: processUnsupportedFrame(frame, CloseStatusCode.PolicyViolation, null);
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}
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private bool send(Opcode opcode, Stream stream)
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{
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lock (_forSend)
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{
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var src = stream;
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var compressed = false;
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var sent = false;
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try
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{
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if (_compression != CompressionMethod.None)
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{
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stream = stream.Compress(_compression);
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compressed = true;
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}
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sent = send(opcode, Mask.Unmask, stream, compressed);
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if (!sent)
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error("Sending a data has been interrupted.");
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}
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catch (Exception ex)
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{
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error("An exception has occurred while sending a data.", ex);
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}
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finally
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{
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if (compressed)
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stream.Dispose();
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src.Dispose();
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}
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return sent;
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}
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}
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private bool send(Opcode opcode, Mask mask, Stream stream, bool compressed)
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{
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var len = stream.Length;
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/* Not fragmented */
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if (len == 0)
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return send(Fin.Final, opcode, mask, new byte[0], compressed);
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var quo = len / FragmentLength;
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var rem = (int)(len % FragmentLength);
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byte[] buff = null;
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if (quo == 0)
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{
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buff = new byte[rem];
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return stream.Read(buff, 0, rem) == rem &&
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send(Fin.Final, opcode, mask, buff, compressed);
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}
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buff = new byte[FragmentLength];
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if (quo == 1 && rem == 0)
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return stream.Read(buff, 0, FragmentLength) == FragmentLength &&
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send(Fin.Final, opcode, mask, buff, compressed);
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/* Send fragmented */
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// Begin
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if (stream.Read(buff, 0, FragmentLength) != FragmentLength ||
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!send(Fin.More, opcode, mask, buff, compressed))
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return false;
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var n = rem == 0 ? quo - 2 : quo - 1;
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for (long i = 0; i < n; i++)
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if (stream.Read(buff, 0, FragmentLength) != FragmentLength ||
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!send(Fin.More, Opcode.Cont, mask, buff, compressed))
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return false;
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// End
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if (rem == 0)
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rem = FragmentLength;
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else
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buff = new byte[rem];
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return stream.Read(buff, 0, rem) == rem &&
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send(Fin.Final, Opcode.Cont, mask, buff, compressed);
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}
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private bool send(Fin fin, Opcode opcode, Mask mask, byte[] data, bool compressed)
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{
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lock (_forConn)
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{
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if (_readyState != WebSocketState.Open)
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{
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return false;
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}
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return writeBytes(
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WebSocketFrame.CreateWebSocketFrame(fin, opcode, mask, data, compressed).ToByteArray());
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}
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}
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private Task sendAsync(Opcode opcode, Stream stream)
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{
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var completionSource = new TaskCompletionSource<bool>();
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Task.Run(() =>
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{
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try
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{
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send(opcode, stream);
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completionSource.TrySetResult(true);
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}
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catch (Exception ex)
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{
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completionSource.TrySetException(ex);
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}
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});
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return completionSource.Task;
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}
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// As server
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private bool sendHttpResponse(HttpResponse response)
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{
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return writeBytes(response.ToByteArray());
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}
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private void startReceiving()
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{
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if (_messageEventQueue.Count > 0)
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_messageEventQueue.Clear();
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_exitReceiving = new AutoResetEvent(false);
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_receivePong = new AutoResetEvent(false);
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Action receive = null;
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receive = () => WebSocketFrame.ReadAsync(
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_stream,
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true,
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frame =>
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{
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if (processWebSocketFrame(frame) && _readyState != WebSocketState.Closed)
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{
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receive();
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if (!frame.IsData)
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return;
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lock (_forEvent)
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{
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try
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{
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var e = dequeueFromMessageEventQueue();
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if (e != null && _readyState == WebSocketState.Open)
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OnMessage.Emit(this, e);
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}
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catch (Exception ex)
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{
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processException(ex, "An exception has occurred while OnMessage.");
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}
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}
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}
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else if (_exitReceiving != null)
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{
|
|
_exitReceiving.Set();
|
|
}
|
|
},
|
|
ex => processException(ex, "An exception has occurred while receiving a message."));
|
|
|
|
receive();
|
|
}
|
|
|
|
private bool writeBytes(byte[] data)
|
|
{
|
|
try
|
|
{
|
|
_stream.Write(data, 0, data.Length);
|
|
return true;
|
|
}
|
|
catch (Exception)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Internal Methods
|
|
|
|
// As server
|
|
internal void Close(HttpResponse response)
|
|
{
|
|
_readyState = WebSocketState.CloseSent;
|
|
sendHttpResponse(response);
|
|
|
|
closeServerResources();
|
|
|
|
_readyState = WebSocketState.Closed;
|
|
}
|
|
|
|
// As server
|
|
internal void Close(HttpStatusCode code)
|
|
{
|
|
Close(createHandshakeCloseResponse(code));
|
|
}
|
|
|
|
// As server
|
|
public void ConnectAsServer()
|
|
{
|
|
try
|
|
{
|
|
_readyState = WebSocketState.Open;
|
|
open();
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
processException(ex, "An exception has occurred while connecting.");
|
|
}
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Public Methods
|
|
|
|
/// <summary>
|
|
/// Closes the WebSocket connection, and releases all associated resources.
|
|
/// </summary>
|
|
public void Close()
|
|
{
|
|
var msg = _readyState.CheckIfClosable();
|
|
if (msg != null)
|
|
{
|
|
error(msg);
|
|
|
|
return;
|
|
}
|
|
|
|
var send = _readyState == WebSocketState.Open;
|
|
close(new PayloadData(), send, send);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Closes the WebSocket connection with the specified <see cref="CloseStatusCode"/>
|
|
/// and <see cref="string"/>, and releases all associated resources.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This method emits a <see cref="OnError"/> event if the size
|
|
/// of <paramref name="reason"/> is greater than 123 bytes.
|
|
/// </remarks>
|
|
/// <param name="code">
|
|
/// One of the <see cref="CloseStatusCode"/> enum values, represents the status code
|
|
/// indicating the reason for the close.
|
|
/// </param>
|
|
/// <param name="reason">
|
|
/// A <see cref="string"/> that represents the reason for the close.
|
|
/// </param>
|
|
public void Close(CloseStatusCode code, string reason)
|
|
{
|
|
byte[] data = null;
|
|
var msg = _readyState.CheckIfClosable() ??
|
|
(data = ((ushort)code).Append(reason)).CheckIfValidControlData("reason");
|
|
|
|
if (msg != null)
|
|
{
|
|
error(msg);
|
|
|
|
return;
|
|
}
|
|
|
|
var send = _readyState == WebSocketState.Open && !code.IsReserved();
|
|
close(new PayloadData(data), send, send);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sends a binary <paramref name="data"/> asynchronously using the WebSocket connection.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This method doesn't wait for the send to be complete.
|
|
/// </remarks>
|
|
/// <param name="data">
|
|
/// An array of <see cref="byte"/> that represents the binary data to send.
|
|
/// </param>
|
|
public Task SendAsync(byte[] data)
|
|
{
|
|
if (data == null)
|
|
{
|
|
throw new ArgumentNullException(nameof(data));
|
|
}
|
|
|
|
var msg = _readyState.CheckIfOpen();
|
|
if (msg != null)
|
|
{
|
|
throw new Exception(msg);
|
|
}
|
|
|
|
return sendAsync(Opcode.Binary, new MemoryStream(data));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sends a text <paramref name="data"/> asynchronously using the WebSocket connection.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This method doesn't wait for the send to be complete.
|
|
/// </remarks>
|
|
/// <param name="data">
|
|
/// A <see cref="string"/> that represents the text data to send.
|
|
/// </param>
|
|
public Task SendAsync(string data)
|
|
{
|
|
if (data == null)
|
|
{
|
|
throw new ArgumentNullException(nameof(data));
|
|
}
|
|
|
|
var msg = _readyState.CheckIfOpen();
|
|
if (msg != null)
|
|
{
|
|
throw new Exception(msg);
|
|
}
|
|
|
|
return sendAsync(Opcode.Text, new MemoryStream(Encoding.UTF8.GetBytes(data)));
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region Explicit Interface Implementation
|
|
|
|
/// <summary>
|
|
/// Closes the WebSocket connection, and releases all associated resources.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This method closes the WebSocket connection with <see cref="CloseStatusCode.Away"/>.
|
|
/// </remarks>
|
|
void IDisposable.Dispose()
|
|
{
|
|
Close(CloseStatusCode.Away, null);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|