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43 \class QWebSocketServer
45 \inmodule QtWebSockets
47 \brief Implements a websocket-based server.
49 It is modeled after QTcpServer, and behaves the same. So, if you know how to use QTcpServer,
50 you know how to use QWebSocketServer.
51 This class makes it possible to accept incoming websocket connections.
52 You can specify the port or have QWebSocketServer pick one automatically.
53 You can listen on a specific address or on all the machine's addresses.
54 Call listen() to have the server listen for incoming connections.
56 The newConnection() signal is then emitted each time a client connects to the server.
57 Call nextPendingConnection() to accept the pending connection as a connected QWebSocket.
58 The function returns a pointer to a QWebSocket in QAbstractSocket::ConnectedState that you can
59 use for communicating with the client.
61 If an error occurs, serverError() returns the type of error, and errorString() can be called
62 to get a human readable description of what happened.
64 When listening for connections, the address and port on which the server is listening are
65 available as serverAddress() and serverPort().
67 Calling close() makes QWebSocketServer stop listening for incoming connections.
69 QWebSocketServer currently does not support
70 \l {http://tools.ietf.org/html/rfc6455#page-39} {extensions} and
71 \l {http://tools.ietf.org/html/rfc6455#page-12} {subprotocols}.
73 QWebSocketServer only supports version 13 of the WebSocket protocol, as outlined in RFC 6455.
81 \page echoserver.html example
82 \title WebSocket server example
83 \brief A sample websocket server echoing back messages sent to it.
86 The echoserver example implements a web socket server that echoes back everything that is sent
89 We start by creating a QWebSocketServer (`new QWebSocketServer()`). After the creation, we listen
90 on all local network interfaces (`QHostAddress::Any`) on the specified \a port.
91 \snippet echoserver/echoserver.cpp constructor
92 If listening is successful, we connect the `newConnection()` signal to the slot
94 The `newConnection()` signal will be thrown whenever a new web socket client is connected to our
97 \snippet echoserver/echoserver.cpp onNewConnection
98 When a new connection is received, the client QWebSocket is retrieved (`nextPendingConnection()`),
99 and the signals we are interested in are connected to our slots
100 (`textMessageReceived()`, `binaryMessageReceived()` and `disconnected()`).
101 The client socket is remembered in a list, in case we would like to use it later
102 (in this example, nothing is done with it).
104 \snippet echoserver/echoserver.cpp processTextMessage
105 Whenever `processTextMessage()` is triggered, we retrieve the sender, and if valid, send back the
106 original message (`sendTextMessage()`).
107 The same is done with binary messages.
108 \snippet echoserver/echoserver.cpp processBinaryMessage
109 The only difference is that the message now is a QByteArray instead of a QString.
111 \snippet echoserver/echoserver.cpp socketDisconnected
112 Whenever a socket is disconnected, we remove it from the clients list and delete the socket.
113 Note: it is best to use `deleteLater()` to delete the socket.
117 \fn void QWebSocketServer::acceptError(QAbstractSocket::SocketError socketError)
118 This signal is emitted when accepting a new connection results in an error.
119 The \a socketError parameter describes the type of error that occurred
121 \sa pauseAccepting(), resumeAccepting()
125 \fn void QWebSocketServer::serverError(QWebSocketProtocol::CloseCode closeCode)
126 This signal is emitted when an error occurs during the setup of a web socket connection.
127 The \a closeCode parameter describes the type of error that occurred
133 \fn void QWebSocketServer::newConnection()
134 This signal is emitted every time a new connection is available.
136 \sa hasPendingConnections(), nextPendingConnection()
140 \fn void QWebSocketServer::closed()
141 This signal is emitted when the server closed it's connection.
147 \fn void QWebSocketServer::originAuthenticationRequired(QWebSocketCorsAuthenticator *authenticator)
148 This signal is emitted when a new connection is requested.
149 The slot connected to this signal should indicate whether the origin
150 (which can be determined by the origin() call) is allowed in the \a authenticator object
151 (by issuing \l{QWebSocketCorsAuthenticator::}{setAllowed()})
153 If no slot is connected to this signal, all origins will be accepted by default.
155 \note It is not possible to use a QueuedConnection to connect to
156 this signal, as the connection will always succeed.
160 \fn void QWebSocketServer::peerVerifyError(const QSslError &error)
162 QWebSocketServer can emit this signal several times during the SSL handshake,
163 before encryption has been established, to indicate that an error has
164 occurred while establishing the identity of the peer. The \a error is
165 usually an indication that QWebSocketServer is unable to securely identify the
168 This signal provides you with an early indication when something's wrong.
169 By connecting to this signal, you can manually choose to tear down the
170 connection from inside the connected slot before the handshake has
171 completed. If no action is taken, QWebSocketServer will proceed to emitting
172 QWebSocketServer::sslErrors().
178 \fn void QWebSocketServer::sslErrors(const QList<QSslError> &errors)
180 QWebSocketServer emits this signal after the SSL handshake to indicate that one
181 or more errors have occurred while establishing the identity of the
182 peer. The errors are usually an indication that QWebSocketServer is unable to
183 securely identify the peer. Unless any action is taken, the connection
184 will be dropped after this signal has been emitted.
186 \a errors contains one or more errors that prevent QSslSocket from
187 verifying the identity of the peer.
189 \sa peerVerifyError()
193 \enum QWebSocketServer::SslMode
194 Indicates whether the server operates over wss (SecureMode) or ws (NonSecureMode)
196 \value SecureMode The server operates in secure mode (over wss)
197 \value NonSecureMode The server operates in non-secure mode (over ws)
200 #include "qwebsocketprotocol.h"
201 #include "qwebsocket.h"
202 #include "qwebsocketserver.h"
203 #include "qwebsocketserver_p.h"
205 #include <QtNetwork/QTcpServer>
206 #include <QtNetwork/QTcpSocket>
207 #include <QtNetwork/QNetworkProxy>
210 #include <QtNetwork/QSslConfiguration>
216 Constructs a new QWebSocketServer with the given \a serverName.
217 The \a serverName will be used in the http handshake phase to identify the server.
218 It can be empty, in which case an empty server name will be sent to the client.
219 The \a secureMode parameter indicates whether the server operates over wss (\l{SecureMode})
220 or over ws (\l{NonSecureMode}).
222 \a parent is passed to the QObject constructor.
224 QWebSocketServer::QWebSocketServer(const QString &serverName, SslMode secureMode,
227 d_ptr(new QWebSocketServerPrivate(serverName,
229 (secureMode == SecureMode) ?
230 QWebSocketServerPrivate::SecureMode :
231 QWebSocketServerPrivate::NonSecureMode,
233 QWebSocketServerPrivate::NonSecureMode,
244 Destroys the WebSocketServer object. If the server is listening for connections,
245 the socket is automatically closed.
246 Any client WebSockets that are still connected are closed and deleted.
250 QWebSocketServer::~QWebSocketServer()
256 Closes the server. The server will no longer listen for incoming connections.
258 void QWebSocketServer::close()
260 Q_D(QWebSocketServer);
265 Returns a human readable description of the last error that occurred.
266 If no error occurred, an empty string is returned.
270 QString QWebSocketServer::errorString() const
272 Q_D(const QWebSocketServer);
273 return d->errorString();
277 Returns true if the server has pending connections; otherwise returns false.
279 \sa nextPendingConnection(), setMaxPendingConnections()
281 bool QWebSocketServer::hasPendingConnections() const
283 Q_D(const QWebSocketServer);
284 return d->hasPendingConnections();
288 Returns true if the server is currently listening for incoming connections;
289 otherwise returns false. If listening fails, error() will return the reason.
291 \sa listen(), error()
293 bool QWebSocketServer::isListening() const
295 Q_D(const QWebSocketServer);
296 return d->isListening();
300 Tells the server to listen for incoming connections on address \a address and port \a port.
301 If \a port is 0, a port is chosen automatically.
302 If \a address is QHostAddress::Any, the server will listen on all network interfaces.
304 Returns true on success; otherwise returns false.
308 bool QWebSocketServer::listen(const QHostAddress &address, quint16 port)
310 Q_D(QWebSocketServer);
311 return d->listen(address, port);
315 Returns the maximum number of pending accepted connections. The default is 30.
317 \sa setMaxPendingConnections(), hasPendingConnections()
319 int QWebSocketServer::maxPendingConnections() const
321 Q_D(const QWebSocketServer);
322 return d->maxPendingConnections();
326 Returns the next pending connection as a connected WebSocket object.
327 The socket is created as a child of the server, which means that it is automatically
328 deleted when the WebSocketServer object is destroyed.
329 It is still a good idea to delete the object explicitly when you are done with it,
330 to avoid wasting memory.
331 Q_NULLPTR is returned if this function is called when there are no pending connections.
333 Note: The returned WebSocket object cannot be used from another thread..
335 \sa hasPendingConnections()
337 QWebSocket *QWebSocketServer::nextPendingConnection()
339 Q_D(QWebSocketServer);
340 return d->nextPendingConnection();
344 Pauses incoming new connections. Queued connections will remain in queue.
345 \sa resumeAccepting()
347 void QWebSocketServer::pauseAccepting()
349 Q_D(QWebSocketServer);
353 #ifndef QT_NO_NETWORKPROXY
355 Returns the network proxy for this socket. By default QNetworkProxy::DefaultProxy is used.
359 QNetworkProxy QWebSocketServer::proxy() const
361 Q_D(const QWebSocketServer);
366 \brief Sets the explicit network proxy for this socket to \a networkProxy.
368 To disable the use of a proxy for this socket, use the QNetworkProxy::NoProxy proxy type:
371 server->setProxy(QNetworkProxy::NoProxy);
376 void QWebSocketServer::setProxy(const QNetworkProxy &networkProxy)
378 Q_D(QWebSocketServer);
379 d->setProxy(networkProxy);
385 Sets the SSL configuration for the websocket server to \a sslConfiguration.
386 This method has no effect if QWebSocketServer runs in non-secure mode
387 (QWebSocketServer::NonSecureMode).
389 \sa sslConfiguration(), SslMode
391 void QWebSocketServer::setSslConfiguration(const QSslConfiguration &sslConfiguration)
393 Q_D(QWebSocketServer);
394 d->setSslConfiguration(sslConfiguration);
398 Returns the SSL configuration used by the websocket server.
399 If the server is not running in secure mode (QWebSocketServer::SecureMode),
400 this method returns QSslConfiguration::defaultConfiguration().
402 \sa setSslConfiguration(), SslMode, QSslConfiguration::defaultConfiguration()
404 QSslConfiguration QWebSocketServer::sslConfiguration() const
406 Q_D(const QWebSocketServer);
407 return d->sslConfiguration();
412 Resumes accepting new connections.
415 void QWebSocketServer::resumeAccepting()
417 Q_D(QWebSocketServer);
418 d->resumeAccepting();
422 Sets the server name that will be used during the http handshake phase to the given
424 Existing connected clients will not be notified of this change, only newly connecting clients
425 will see this new name.
427 void QWebSocketServer::setServerName(const QString &serverName)
429 Q_D(QWebSocketServer);
430 d->setServerName(serverName);
434 Returns the server name that is used during the http handshake phase.
436 QString QWebSocketServer::serverName() const
438 Q_D(const QWebSocketServer);
439 return d->serverName();
443 Returns the server's address if the server is listening for connections; otherwise returns
446 \sa serverPort(), listen()
448 QHostAddress QWebSocketServer::serverAddress() const
450 Q_D(const QWebSocketServer);
451 return d->serverAddress();
455 Returns the secure mode the server is running in.
457 \sa QWebSocketServer(), SslMode
459 QWebSocketServer::SslMode QWebSocketServer::secureMode() const
462 Q_D(const QWebSocketServer);
463 return (d->secureMode() == QWebSocketServerPrivate::SecureMode) ?
464 QWebSocketServer::SecureMode : QWebSocketServer::NonSecureMode;
466 return QWebSocketServer::NonSecureMode;
471 Returns an error code for the last error that occurred.
472 If no error occurred, QWebSocketProtocol::CloseCodeNormal is returned.
476 QWebSocketProtocol::CloseCode QWebSocketServer::error() const
478 Q_D(const QWebSocketServer);
479 return d->serverError();
483 Returns the server's port if the server is listening for connections; otherwise returns 0.
485 \sa serverAddress(), listen()
487 quint16 QWebSocketServer::serverPort() const
489 Q_D(const QWebSocketServer);
490 return d->serverPort();
494 Sets the maximum number of pending accepted connections to \a numConnections.
495 WebSocketServer will accept no more than \a numConnections incoming connections before
496 nextPendingConnection() is called.
497 By default, the limit is 30 pending connections.
499 Clients may still able to connect after the server has reached its maximum number of
500 pending connections (i.e., WebSocket can still emit the connected() signal).
501 WebSocketServer will stop accepting the new connections, but the operating system may still
504 \sa maxPendingConnections(), hasPendingConnections()
506 void QWebSocketServer::setMaxPendingConnections(int numConnections)
508 Q_D(QWebSocketServer);
509 d->setMaxPendingConnections(numConnections);
513 Sets the socket descriptor this server should use when listening for incoming connections to
516 Returns true if the socket is set successfully; otherwise returns false.
517 The socket is assumed to be in listening state.
519 \sa socketDescriptor(), isListening()
521 bool QWebSocketServer::setSocketDescriptor(int socketDescriptor)
523 Q_D(QWebSocketServer);
524 return d->setSocketDescriptor(socketDescriptor);
528 Returns the native socket descriptor the server uses to listen for incoming instructions,
529 or -1 if the server is not listening.
530 If the server is using QNetworkProxy, the returned descriptor may not be usable with
531 native socket functions.
533 \sa setSocketDescriptor(), isListening()
535 int QWebSocketServer::socketDescriptor() const
537 Q_D(const QWebSocketServer);
538 return d->socketDescriptor();
542 Returns a list of websocket versions that this server is supporting.
544 QList<QWebSocketProtocol::Version> QWebSocketServer::supportedVersions() const
546 Q_D(const QWebSocketServer);
547 return d->supportedVersions();