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path: root/examples/webchannel/shared/websockettransport.cpp
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/****************************************************************************
**
** Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "websockettransport.h"

#include <QJsonDocument>
#include <QJsonObject>
#include <QDebug>

#include <QtWebSockets/QWebSocket>

/*!
    \brief QWebChannelAbstractSocket implementation that uses a QWebSocket internally.

    The transport delegates all messages received over the QWebSocket over its
    textMessageReceived signal. Analogously, all calls to sendTextMessage will
    be send over the QWebSocket to the remote client.
*/

QT_BEGIN_NAMESPACE

/*!
    Construct the transport object and wrap the given socket.

    The socket is also set as the parent of the transport object.
*/
WebSocketTransport::WebSocketTransport(QWebSocket *socket)
: QWebChannelAbstractTransport(socket)
, m_socket(socket)
{
    connect(socket, &QWebSocket::textMessageReceived,
            this, &WebSocketTransport::textMessageReceived);
    connect(socket, &QWebSocket::disconnected,
            this, &WebSocketTransport::deleteLater);
}

/*!
    Destroys the WebSocketTransport.
*/
WebSocketTransport::~WebSocketTransport()
{
    m_socket->deleteLater();
}

/*!
    Serialize the JSON message and send it as a text message via the WebSocket to the client.
*/
void WebSocketTransport::sendMessage(const QJsonObject &message)
{
    QJsonDocument doc(message);
    m_socket->sendTextMessage(QString::fromUtf8(doc.toJson(QJsonDocument::Compact)));
}

/*!
    Deserialize the stringified JSON messageData and emit messageReceived.
*/
void WebSocketTransport::textMessageReceived(const QString &messageData)
{
    QJsonParseError error;
    QJsonDocument message = QJsonDocument::fromJson(messageData.toUtf8(), &error);
    if (error.error) {
        qWarning() << "Failed to parse text message as JSON object:" << messageData
                   << "Error is:" << error.errorString();
        return;
    } else if (!message.isObject()) {
        qWarning() << "Received JSON message that is not an object: " << messageData;
        return;
    }
    emit messageReceived(message.object(), this);
}

QT_END_NAMESPACE