- Qt 5.5
- Qt WebEngine Widgets
- WebEngine Tab Browser Example
- networkaccessmanager.cpp Example File
- Qt 5.5.1 Reference Documentation

# networkaccessmanager.cpp Example File

browser/networkaccessmanager.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL$
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    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPL included in the
    ** packaging of this file. Please review the following information to
    ** ensure the GNU Lesser General Public License version 2.1 requirements
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    ** GNU General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU
    ** General Public License version 3.0 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file. Please review the following information to
    ** ensure the GNU General Public License version 3.0 requirements will be
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    #include "networkaccessmanager.h"

    #include "browserapplication.h"
    #include "browsermainwindow.h"

    #include <QtCore/QSettings>

    #include <QtGui/QDesktopServices>
    #include <QtWidgets/QDialog>
    #include <QtWidgets/QMessageBox>
    #include <QtWidgets/QStyle>
    #include <QtGui/QTextDocument>

    #include <QtNetwork/QAuthenticator>
    #include <QtNetwork/QNetworkDiskCache>
    #include <QtNetwork/QNetworkProxy>
    #include <QtNetwork/QNetworkRequest>
    #include <QtNetwork/QNetworkReply>
    #include <QtNetwork/QSslError>

    NetworkAccessManager::NetworkAccessManager(QObject *parent)
        : QNetworkAccessManager(parent),
        requestFinishedCount(0), requestFinishedFromCacheCount(0), requestFinishedPipelinedCount(0),
        requestFinishedSecureCount(0), requestFinishedDownloadBufferCount(0)
    {
        connect(this, SIGNAL(finished(QNetworkReply*)),
                SLOT(requestFinished(QNetworkReply*)));
    #ifndef QT_NO_OPENSSL
        connect(this, SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)),
                SLOT(sslErrors(QNetworkReply*,QList<QSslError>)));
    #endif
        loadSettings();

        QNetworkDiskCache *diskCache = new QNetworkDiskCache(this);
        QString location = QStandardPaths::writableLocation(QStandardPaths::CacheLocation);
        diskCache->setCacheDirectory(location);
        setCache(diskCache);
    }

    QNetworkReply* NetworkAccessManager::createRequest(Operation op, const QNetworkRequest & req, QIODevice * outgoingData)
    {
        QNetworkRequest request = req; // copy so we can modify
        // this is a temporary hack until we properly use the pipelining flags from QtWebkit
        // pipeline everything! :)
        request.setAttribute(QNetworkRequest::HttpPipeliningAllowedAttribute, true);
        return QNetworkAccessManager::createRequest(op, request, outgoingData);
    }

    void NetworkAccessManager::requestFinished(QNetworkReply *reply)
    {
        requestFinishedCount++;

        if (reply->attribute(QNetworkRequest::SourceIsFromCacheAttribute).toBool() == true)
            requestFinishedFromCacheCount++;

        if (reply->attribute(QNetworkRequest::HttpPipeliningWasUsedAttribute).toBool() == true)
            requestFinishedPipelinedCount++;

        if (reply->attribute(QNetworkRequest::ConnectionEncryptedAttribute).toBool() == true)
            requestFinishedSecureCount++;

        if (reply->attribute(QNetworkRequest::DownloadBufferAttribute).isValid() == true)
            requestFinishedDownloadBufferCount++;

        if (requestFinishedCount % 10)
            return;

    #ifdef QT_DEBUG
        double pctCached = (double(requestFinishedFromCacheCount) * 100.0/ double(requestFinishedCount));
        double pctPipelined = (double(requestFinishedPipelinedCount) * 100.0/ double(requestFinishedCount));
        double pctSecure = (double(requestFinishedSecureCount) * 100.0/ double(requestFinishedCount));
        double pctDownloadBuffer = (double(requestFinishedDownloadBufferCount) * 100.0/ double(requestFinishedCount));

        qDebug("STATS [%lli requests total] [%3.2f%% from cache] [%3.2f%% pipelined] [%3.2f%% SSL/TLS] [%3.2f%% Zerocopy]", requestFinishedCount, pctCached, pctPipelined, pctSecure, pctDownloadBuffer);
    #endif
    }

    void NetworkAccessManager::loadSettings()
    {
        QSettings settings;
        settings.beginGroup(QLatin1String("proxy"));
        QNetworkProxy proxy;
        if (settings.value(QLatin1String("enabled"), false).toBool()) {
            if (settings.value(QLatin1String("type"), 0).toInt() == 0)
                proxy = QNetworkProxy::Socks5Proxy;
            else
                proxy = QNetworkProxy::HttpProxy;
            proxy.setHostName(settings.value(QLatin1String("hostName")).toString());
            proxy.setPort(settings.value(QLatin1String("port"), 1080).toInt());
            proxy.setUser(settings.value(QLatin1String("userName")).toString());
            proxy.setPassword(settings.value(QLatin1String("password")).toString());
        }
        setProxy(proxy);
    }

    #ifndef QT_NO_OPENSSL
    void NetworkAccessManager::sslErrors(QNetworkReply *reply, const QList<QSslError> &error)
    {
        // check if SSL certificate has been trusted already
        QString replyHost = reply->url().host() + QString(":%1").arg(reply->url().port());
        if (! sslTrustedHostList.contains(replyHost)) {
            BrowserMainWindow *mainWindow = BrowserApplication::instance()->mainWindow();

            QStringList errorStrings;
            for (int i = 0; i < error.count(); ++i)
                errorStrings += error.at(i).errorString();
            QString errors = errorStrings.join(QLatin1String("\n"));
            int ret = QMessageBox::warning(mainWindow, QCoreApplication::applicationName(),
                    tr("SSL Errors:\n\n%1\n\n%2\n\n"
                            "Do you want to ignore these errors for this host?").arg(reply->url().toString()).arg(errors),
                            QMessageBox::Yes | QMessageBox::No,
                            QMessageBox::No);
            if (ret == QMessageBox::Yes) {
                reply->ignoreSslErrors();
                sslTrustedHostList.append(replyHost);
            }
        }
    }
    #endif