jellyfin/SocketHttpListener.Portable/WebSocket.cs

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C#
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2016-11-11 19:55:12 +00:00
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
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using MediaBrowser.Model.Cryptography;
using MediaBrowser.Model.IO;
using SocketHttpListener.Net.WebSockets;
using SocketHttpListener.Primitives;
using HttpStatusCode = SocketHttpListener.Net.HttpStatusCode;
namespace SocketHttpListener
{
/// <summary>
/// Implements the WebSocket interface.
/// </summary>
/// <remarks>
/// The WebSocket class provides a set of methods and properties for two-way communication using
/// the WebSocket protocol (<see href="http://tools.ietf.org/html/rfc6455">RFC 6455</see>).
/// </remarks>
public class WebSocket : IDisposable
{
#region Private Fields
private string _base64Key;
private Action _closeContext;
private CompressionMethod _compression;
private WebSocketContext _context;
private CookieCollection _cookies;
private string _extensions;
private AutoResetEvent _exitReceiving;
private object _forConn;
private object _forEvent;
private object _forMessageEventQueue;
private object _forSend;
private const string _guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private Func<WebSocketContext, string>
_handshakeRequestChecker;
private Queue<MessageEventArgs> _messageEventQueue;
private uint _nonceCount;
private string _origin;
private bool _preAuth;
private string _protocol;
private string[] _protocols;
private Uri _proxyUri;
private volatile WebSocketState _readyState;
private AutoResetEvent _receivePong;
private bool _secure;
private Stream _stream;
private Uri _uri;
private const string _version = "13";
private readonly IMemoryStreamFactory _memoryStreamFactory;
private readonly ICryptoProvider _cryptoProvider;
#endregion
#region Internal Fields
internal const int FragmentLength = 1016; // Max value is int.MaxValue - 14.
#endregion
#region Internal Constructors
// As server
internal WebSocket(HttpListenerWebSocketContext context, string protocol, ICryptoProvider cryptoProvider, IMemoryStreamFactory memoryStreamFactory)
{
_context = context;
_protocol = protocol;
_cryptoProvider = cryptoProvider;
_memoryStreamFactory = memoryStreamFactory;
_closeContext = context.Close;
_secure = context.IsSecureConnection;
_stream = context.Stream;
init();
}
#endregion
// As server
internal Func<WebSocketContext, string> CustomHandshakeRequestChecker
{
get
{
return _handshakeRequestChecker ?? (context => null);
}
set
{
_handshakeRequestChecker = value;
}
}
internal bool IsConnected
{
get
{
return _readyState == WebSocketState.Open || _readyState == WebSocketState.Closing;
}
}
/// <summary>
/// Gets the state of the WebSocket connection.
/// </summary>
/// <value>
/// One of the <see cref="WebSocketState"/> enum values, indicates the state of the WebSocket
/// connection. The default value is <see cref="WebSocketState.Connecting"/>.
/// </value>
public WebSocketState ReadyState
{
get
{
return _readyState;
}
}
#region Public Events
/// <summary>
/// Occurs when the WebSocket connection has been closed.
/// </summary>
public event EventHandler<CloseEventArgs> OnClose;
/// <summary>
/// Occurs when the <see cref="WebSocket"/> gets an error.
/// </summary>
public event EventHandler<ErrorEventArgs> OnError;
/// <summary>
/// Occurs when the <see cref="WebSocket"/> receives a message.
/// </summary>
public event EventHandler<MessageEventArgs> OnMessage;
/// <summary>
/// Occurs when the WebSocket connection has been established.
/// </summary>
public event EventHandler OnOpen;
#endregion
#region Private Methods
// As server
private bool acceptHandshake()
{
var msg = checkIfValidHandshakeRequest(_context);
if (msg != null)
{
error("An error has occurred while connecting: " + msg);
Close(HttpStatusCode.BadRequest);
return false;
}
if (_protocol != null &&
!_context.SecWebSocketProtocols.Contains(protocol => protocol == _protocol))
_protocol = null;
////var extensions = _context.Headers["Sec-WebSocket-Extensions"];
////if (extensions != null && extensions.Length > 0)
//// processSecWebSocketExtensionsHeader(extensions);
return sendHttpResponse(createHandshakeResponse());
}
// As server
private string checkIfValidHandshakeRequest(WebSocketContext context)
{
var headers = context.Headers;
return context.RequestUri == null
? "Invalid request url."
: !context.IsWebSocketRequest
? "Not WebSocket connection request."
: !validateSecWebSocketKeyHeader(headers["Sec-WebSocket-Key"])
? "Invalid Sec-WebSocket-Key header."
: !validateSecWebSocketVersionClientHeader(headers["Sec-WebSocket-Version"])
? "Invalid Sec-WebSocket-Version header."
: CustomHandshakeRequestChecker(context);
}
private void close(CloseStatusCode code, string reason, bool wait)
{
close(new PayloadData(((ushort)code).Append(reason)), !code.IsReserved(), wait);
}
private void close(PayloadData payload, bool send, bool wait)
{
lock (_forConn)
{
if (_readyState == WebSocketState.Closing || _readyState == WebSocketState.Closed)
{
return;
}
_readyState = WebSocketState.Closing;
}
var e = new CloseEventArgs(payload);
e.WasClean =
closeHandshake(
send ? WebSocketFrame.CreateCloseFrame(Mask.Unmask, payload).ToByteArray() : null,
wait ? 1000 : 0,
closeServerResources);
_readyState = WebSocketState.Closed;
try
{
OnClose.Emit(this, e);
}
catch (Exception ex)
{
error("An exception has occurred while OnClose.", ex);
}
}
private bool closeHandshake(byte[] frameAsBytes, int millisecondsTimeout, Action release)
{
var sent = frameAsBytes != null && writeBytes(frameAsBytes);
var received =
millisecondsTimeout == 0 ||
(sent && _exitReceiving != null && _exitReceiving.WaitOne(millisecondsTimeout));
release();
if (_receivePong != null)
{
_receivePong.Dispose();
_receivePong = null;
}
if (_exitReceiving != null)
{
_exitReceiving.Dispose();
_exitReceiving = null;
}
var result = sent && received;
return result;
}
// As server
private void closeServerResources()
{
if (_closeContext == null)
return;
_closeContext();
_closeContext = null;
_stream = null;
_context = null;
}
private bool concatenateFragmentsInto(Stream dest)
{
while (true)
{
var frame = WebSocketFrame.Read(_stream, true);
if (frame.IsFinal)
{
/* FINAL */
// CONT
if (frame.IsContinuation)
{
dest.WriteBytes(frame.PayloadData.ApplicationData);
break;
}
// PING
if (frame.IsPing)
{
processPingFrame(frame);
continue;
}
// PONG
if (frame.IsPong)
{
processPongFrame(frame);
continue;
}
// CLOSE
if (frame.IsClose)
return processCloseFrame(frame);
}
else
{
/* MORE */
// CONT
if (frame.IsContinuation)
{
dest.WriteBytes(frame.PayloadData.ApplicationData);
continue;
}
}
// ?
return processUnsupportedFrame(
frame,
CloseStatusCode.IncorrectData,
"An incorrect data has been received while receiving fragmented data.");
}
return true;
}
// As server
private HttpResponse createHandshakeCloseResponse(HttpStatusCode code)
{
var res = HttpResponse.CreateCloseResponse(code);
res.Headers["Sec-WebSocket-Version"] = _version;
return res;
}
// As server
private HttpResponse createHandshakeResponse()
{
var res = HttpResponse.CreateWebSocketResponse();
var headers = res.Headers;
headers["Sec-WebSocket-Accept"] = CreateResponseKey(_base64Key);
if (_protocol != null)
headers["Sec-WebSocket-Protocol"] = _protocol;
if (_extensions != null)
headers["Sec-WebSocket-Extensions"] = _extensions;
if (_cookies.Count > 0)
res.SetCookies(_cookies);
return res;
}
private MessageEventArgs dequeueFromMessageEventQueue()
{
lock (_forMessageEventQueue)
return _messageEventQueue.Count > 0
? _messageEventQueue.Dequeue()
: null;
}
private void enqueueToMessageEventQueue(MessageEventArgs e)
{
lock (_forMessageEventQueue)
_messageEventQueue.Enqueue(e);
}
private void error(string message, Exception exception)
{
try
{
if (exception != null)
{
message += ". Exception.Message: " + exception.Message;
}
OnError.Emit(this, new ErrorEventArgs(message));
}
catch (Exception ex)
{
}
}
private void error(string message)
{
try
{
OnError.Emit(this, new ErrorEventArgs(message));
}
catch (Exception ex)
{
}
}
private void init()
{
_compression = CompressionMethod.None;
_cookies = new CookieCollection();
_forConn = new object();
_forEvent = new object();
_forSend = new object();
_messageEventQueue = new Queue<MessageEventArgs>();
_forMessageEventQueue = ((ICollection)_messageEventQueue).SyncRoot;
_readyState = WebSocketState.Connecting;
}
private void open()
{
try
{
startReceiving();
lock (_forEvent)
{
try
{
OnOpen.Emit(this, EventArgs.Empty);
}
catch (Exception ex)
{
processException(ex, "An exception has occurred while OnOpen.");
}
}
}
catch (Exception ex)
{
processException(ex, "An exception has occurred while opening.");
}
}
private bool processCloseFrame(WebSocketFrame frame)
{
var payload = frame.PayloadData;
close(payload, !payload.ContainsReservedCloseStatusCode, false);
return false;
}
private bool processDataFrame(WebSocketFrame frame)
{
var e = frame.IsCompressed
? new MessageEventArgs(
frame.Opcode, frame.PayloadData.ApplicationData.Decompress(_compression))
: new MessageEventArgs(frame.Opcode, frame.PayloadData);
enqueueToMessageEventQueue(e);
return true;
}
private void processException(Exception exception, string message)
{
var code = CloseStatusCode.Abnormal;
var reason = message;
if (exception is WebSocketException)
{
var wsex = (WebSocketException)exception;
code = wsex.Code;
reason = wsex.Message;
}
error(message ?? code.GetMessage(), exception);
if (_readyState == WebSocketState.Connecting)
Close(HttpStatusCode.BadRequest);
else
close(code, reason ?? code.GetMessage(), false);
}
private bool processFragmentedFrame(WebSocketFrame frame)
{
return frame.IsContinuation // Not first fragment
? true
: processFragments(frame);
}
private bool processFragments(WebSocketFrame first)
{
using (var buff = _memoryStreamFactory.CreateNew())
{
buff.WriteBytes(first.PayloadData.ApplicationData);
if (!concatenateFragmentsInto(buff))
return false;
byte[] data;
if (_compression != CompressionMethod.None)
{
data = buff.DecompressToArray(_compression);
}
else
{
data = buff.ToArray();
}
enqueueToMessageEventQueue(new MessageEventArgs(first.Opcode, data));
return true;
}
}
private bool processPingFrame(WebSocketFrame frame)
{
var mask = Mask.Unmask;
return true;
}
private bool processPongFrame(WebSocketFrame frame)
{
_receivePong.Set();
return true;
}
private bool processUnsupportedFrame(WebSocketFrame frame, CloseStatusCode code, string reason)
{
processException(new WebSocketException(code, reason), null);
return false;
}
private bool processWebSocketFrame(WebSocketFrame frame)
{
return frame.IsCompressed && _compression == CompressionMethod.None
? processUnsupportedFrame(
frame,
CloseStatusCode.IncorrectData,
"A compressed data has been received without available decompression method.")
: frame.IsFragmented
? processFragmentedFrame(frame)
: frame.IsData
? processDataFrame(frame)
: frame.IsPing
? processPingFrame(frame)
: frame.IsPong
? processPongFrame(frame)
: frame.IsClose
? processCloseFrame(frame)
: processUnsupportedFrame(frame, CloseStatusCode.PolicyViolation, null);
}
private bool send(Opcode opcode, Stream stream)
{
lock (_forSend)
{
var src = stream;
var compressed = false;
var sent = false;
try
{
if (_compression != CompressionMethod.None)
{
stream = stream.Compress(_compression);
compressed = true;
}
sent = send(opcode, Mask.Unmask, stream, compressed);
if (!sent)
error("Sending a data has been interrupted.");
}
catch (Exception ex)
{
error("An exception has occurred while sending a data.", ex);
}
finally
{
if (compressed)
stream.Dispose();
src.Dispose();
}
return sent;
}
}
private bool send(Opcode opcode, Mask mask, Stream stream, bool compressed)
{
var len = stream.Length;
/* Not fragmented */
if (len == 0)
return send(Fin.Final, opcode, mask, new byte[0], compressed);
var quo = len / FragmentLength;
var rem = (int)(len % FragmentLength);
byte[] buff = null;
if (quo == 0)
{
buff = new byte[rem];
return stream.Read(buff, 0, rem) == rem &&
send(Fin.Final, opcode, mask, buff, compressed);
}
buff = new byte[FragmentLength];
if (quo == 1 && rem == 0)
return stream.Read(buff, 0, FragmentLength) == FragmentLength &&
send(Fin.Final, opcode, mask, buff, compressed);
/* Send fragmented */
// Begin
if (stream.Read(buff, 0, FragmentLength) != FragmentLength ||
!send(Fin.More, opcode, mask, buff, compressed))
return false;
var n = rem == 0 ? quo - 2 : quo - 1;
for (long i = 0; i < n; i++)
if (stream.Read(buff, 0, FragmentLength) != FragmentLength ||
!send(Fin.More, Opcode.Cont, mask, buff, compressed))
return false;
// End
if (rem == 0)
rem = FragmentLength;
else
buff = new byte[rem];
return stream.Read(buff, 0, rem) == rem &&
send(Fin.Final, Opcode.Cont, mask, buff, compressed);
}
private bool send(Fin fin, Opcode opcode, Mask mask, byte[] data, bool compressed)
{
lock (_forConn)
{
if (_readyState != WebSocketState.Open)
{
return false;
}
return writeBytes(
WebSocketFrame.CreateWebSocketFrame(fin, opcode, mask, data, compressed).ToByteArray());
}
}
private Task sendAsync(Opcode opcode, Stream stream)
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{
var completionSource = new TaskCompletionSource<bool>();
Task.Run(() =>
{
try
{
send(opcode, stream);
completionSource.TrySetResult(true);
}
catch (Exception ex)
{
completionSource.TrySetException(ex);
}
});
return completionSource.Task;
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}
// As server
private bool sendHttpResponse(HttpResponse response)
{
return writeBytes(response.ToByteArray());
}
private void startReceiving()
{
if (_messageEventQueue.Count > 0)
_messageEventQueue.Clear();
_exitReceiving = new AutoResetEvent(false);
_receivePong = new AutoResetEvent(false);
Action receive = null;
receive = () => WebSocketFrame.ReadAsync(
_stream,
true,
frame =>
{
if (processWebSocketFrame(frame) && _readyState != WebSocketState.Closed)
{
receive();
if (!frame.IsData)
return;
lock (_forEvent)
{
try
{
var e = dequeueFromMessageEventQueue();
if (e != null && _readyState == WebSocketState.Open)
OnMessage.Emit(this, e);
}
catch (Exception ex)
{
processException(ex, "An exception has occurred while OnMessage.");
}
}
}
else if (_exitReceiving != null)
{
_exitReceiving.Set();
}
},
ex => processException(ex, "An exception has occurred while receiving a message."));
receive();
}
// As server
private bool validateSecWebSocketKeyHeader(string value)
{
if (value == null || value.Length == 0)
return false;
_base64Key = value;
return true;
}
// As server
private bool validateSecWebSocketVersionClientHeader(string value)
{
return true;
//return value != null && value == _version;
}
private bool writeBytes(byte[] data)
{
try
{
_stream.Write(data, 0, data.Length);
return true;
}
catch (Exception ex)
{
return false;
}
}
#endregion
#region Internal Methods
// As server
internal void Close(HttpResponse response)
{
_readyState = WebSocketState.Closing;
sendHttpResponse(response);
closeServerResources();
_readyState = WebSocketState.Closed;
}
// As server
internal void Close(HttpStatusCode code)
{
Close(createHandshakeCloseResponse(code));
}
// As server
public void ConnectAsServer()
{
try
{
if (acceptHandshake())
{
_readyState = WebSocketState.Open;
open();
}
}
catch (Exception ex)
{
processException(ex, "An exception has occurred while connecting.");
}
}
private string CreateResponseKey(string base64Key)
{
var buff = new StringBuilder(base64Key, 64);
buff.Append(_guid);
var src = _cryptoProvider.ComputeSHA1(Encoding.UTF8.GetBytes(buff.ToString()));
return Convert.ToBase64String(src);
}
#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>
/// An Action&lt;bool&gt; delegate that references the method(s) called when the send is
/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
/// complete successfully; otherwise, <c>false</c>.
public Task SendAsync(byte[] data)
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{
var msg = _readyState.CheckIfOpen() ?? data.CheckIfValidSendData();
if (msg != null)
{
throw new Exception(msg);
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}
return sendAsync(Opcode.Binary, _memoryStreamFactory.CreateNew(data));
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}
/// <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>
/// An Action&lt;bool&gt; delegate that references the method(s) called when the send is
/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
/// complete successfully; otherwise, <c>false</c>.
public Task SendAsync(string data)
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{
var msg = _readyState.CheckIfOpen() ?? data.CheckIfValidSendData();
if (msg != null)
{
throw new Exception(msg);
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}
return sendAsync(Opcode.Text, _memoryStreamFactory.CreateNew(Encoding.UTF8.GetBytes(data)));
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}
#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
}
}