2011-04-27 10:05:43 +00:00
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/****************************************************************************
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**
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2017-09-27 13:33:25 +00:00
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** Copyright (C) 2017 The Qt Company Ltd.
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2016-01-22 12:24:00 +00:00
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** Contact: https://www.qt.io/licensing/
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2011-04-27 10:05:43 +00:00
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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2016-01-22 12:24:00 +00:00
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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2011-04-27 10:05:43 +00:00
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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2015-02-13 11:15:33 +00:00
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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2012-09-19 12:28:29 +00:00
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**
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2011-04-27 10:05:43 +00:00
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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2012-01-24 06:17:24 +00:00
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**
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2011-04-27 10:05:43 +00:00
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "downloadmanager.h"
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2017-09-27 13:33:25 +00:00
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#include <QTextStream>
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#include <cstdio>
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using namespace std;
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2011-04-27 10:05:43 +00:00
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DownloadManager::DownloadManager(QObject *parent)
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2017-09-27 13:33:25 +00:00
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: QObject(parent)
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2011-04-27 10:05:43 +00:00
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{
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}
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2017-09-27 13:33:25 +00:00
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void DownloadManager::append(const QStringList &urls)
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2011-04-27 10:05:43 +00:00
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{
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2017-09-27 13:33:25 +00:00
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for (const QString &urlAsString : urls)
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append(QUrl::fromEncoded(urlAsString.toLocal8Bit()));
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2011-04-27 10:05:43 +00:00
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if (downloadQueue.isEmpty())
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QTimer::singleShot(0, this, SIGNAL(finished()));
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}
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void DownloadManager::append(const QUrl &url)
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{
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if (downloadQueue.isEmpty())
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QTimer::singleShot(0, this, SLOT(startNextDownload()));
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downloadQueue.enqueue(url);
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++totalCount;
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}
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QString DownloadManager::saveFileName(const QUrl &url)
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{
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QString path = url.path();
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QString basename = QFileInfo(path).fileName();
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if (basename.isEmpty())
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basename = "download";
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if (QFile::exists(basename)) {
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// already exists, don't overwrite
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int i = 0;
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basename += '.';
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while (QFile::exists(basename + QString::number(i)))
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++i;
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basename += QString::number(i);
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}
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return basename;
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}
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void DownloadManager::startNextDownload()
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{
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if (downloadQueue.isEmpty()) {
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printf("%d/%d files downloaded successfully\n", downloadedCount, totalCount);
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emit finished();
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return;
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}
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QUrl url = downloadQueue.dequeue();
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QString filename = saveFileName(url);
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output.setFileName(filename);
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if (!output.open(QIODevice::WriteOnly)) {
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fprintf(stderr, "Problem opening save file '%s' for download '%s': %s\n",
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qPrintable(filename), url.toEncoded().constData(),
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qPrintable(output.errorString()));
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startNextDownload();
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return; // skip this download
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}
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QNetworkRequest request(url);
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currentDownload = manager.get(request);
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connect(currentDownload, SIGNAL(downloadProgress(qint64,qint64)),
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SLOT(downloadProgress(qint64,qint64)));
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connect(currentDownload, SIGNAL(finished()),
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SLOT(downloadFinished()));
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connect(currentDownload, SIGNAL(readyRead()),
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SLOT(downloadReadyRead()));
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// prepare the output
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printf("Downloading %s...\n", url.toEncoded().constData());
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2019-06-12 16:06:23 +00:00
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downloadTimer.start();
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2011-04-27 10:05:43 +00:00
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}
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void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
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{
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progressBar.setStatus(bytesReceived, bytesTotal);
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// calculate the download speed
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double speed = bytesReceived * 1000.0 / downloadTimer.elapsed();
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2011-04-27 10:05:43 +00:00
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QString unit;
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if (speed < 1024) {
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unit = "bytes/sec";
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} else if (speed < 1024*1024) {
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speed /= 1024;
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unit = "kB/s";
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} else {
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speed /= 1024*1024;
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unit = "MB/s";
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}
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progressBar.setMessage(QString::fromLatin1("%1 %2")
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.arg(speed, 3, 'f', 1).arg(unit));
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progressBar.update();
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}
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void DownloadManager::downloadFinished()
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{
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progressBar.clear();
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output.close();
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if (currentDownload->error()) {
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// download failed
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fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString()));
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2017-09-27 13:33:25 +00:00
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output.remove();
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2011-04-27 10:05:43 +00:00
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} else {
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2017-09-27 13:33:25 +00:00
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// let's check if it was actually a redirect
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if (isHttpRedirect()) {
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reportRedirect();
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output.remove();
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} else {
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printf("Succeeded.\n");
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++downloadedCount;
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}
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2011-04-27 10:05:43 +00:00
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}
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currentDownload->deleteLater();
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startNextDownload();
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}
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void DownloadManager::downloadReadyRead()
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{
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output.write(currentDownload->readAll());
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}
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2017-09-27 13:33:25 +00:00
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bool DownloadManager::isHttpRedirect() const
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{
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int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
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return statusCode == 301 || statusCode == 302 || statusCode == 303
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|| statusCode == 305 || statusCode == 307 || statusCode == 308;
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}
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void DownloadManager::reportRedirect()
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{
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int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
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QUrl requestUrl = currentDownload->request().url();
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QTextStream(stderr) << "Request: " << requestUrl.toDisplayString()
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<< " was redirected with code: " << statusCode
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<< '\n';
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QVariant target = currentDownload->attribute(QNetworkRequest::RedirectionTargetAttribute);
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if (!target.isValid())
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return;
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QUrl redirectUrl = target.toUrl();
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if (redirectUrl.isRelative())
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redirectUrl = requestUrl.resolved(redirectUrl);
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QTextStream(stderr) << "Redirected to: " << redirectUrl.toDisplayString()
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<< '\n';
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}
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