343 lines
12 KiB
C++
343 lines
12 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** 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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**
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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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** * 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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**
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "httpwindow.h"
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#include "ui_authenticationdialog.h"
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#include <QtWidgets>
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#include <QtNetwork>
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#include <QUrl>
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#if QT_CONFIG(ssl)
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const char defaultUrl[] = "https://www.qt.io/";
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#else
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const char defaultUrl[] = "http://www.qt.io/";
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#endif
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const char defaultFileName[] = "index.html";
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ProgressDialog::ProgressDialog(const QUrl &url, QWidget *parent)
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: QProgressDialog(parent)
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{
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setWindowTitle(tr("Download Progress"));
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setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
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setLabelText(tr("Downloading %1.").arg(url.toDisplayString()));
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setMinimum(0);
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setValue(0);
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setMinimumDuration(0);
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setMinimumSize(QSize(400, 75));
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}
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ProgressDialog::~ProgressDialog()
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{
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}
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void ProgressDialog::networkReplyProgress(qint64 bytesRead, qint64 totalBytes)
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{
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setMaximum(totalBytes);
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setValue(bytesRead);
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}
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HttpWindow::HttpWindow(QWidget *parent)
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: QDialog(parent)
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, statusLabel(new QLabel(tr("Please enter the URL of a file you want to download.\n\n"), this))
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, urlLineEdit(new QLineEdit(defaultUrl))
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, downloadButton(new QPushButton(tr("Download")))
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, launchCheckBox(new QCheckBox("Launch file"))
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, defaultFileLineEdit(new QLineEdit(defaultFileName))
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, downloadDirectoryLineEdit(new QLineEdit)
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, reply(nullptr)
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, file(nullptr)
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, httpRequestAborted(false)
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{
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setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
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setWindowTitle(tr("HTTP"));
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connect(&qnam, &QNetworkAccessManager::authenticationRequired,
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this, &HttpWindow::slotAuthenticationRequired);
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#ifndef QT_NO_SSL
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connect(&qnam, &QNetworkAccessManager::sslErrors,
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this, &HttpWindow::sslErrors);
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#endif
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QFormLayout *formLayout = new QFormLayout;
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urlLineEdit->setClearButtonEnabled(true);
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connect(urlLineEdit, &QLineEdit::textChanged,
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this, &HttpWindow::enableDownloadButton);
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formLayout->addRow(tr("&URL:"), urlLineEdit);
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QString downloadDirectory = QStandardPaths::writableLocation(QStandardPaths::TempLocation);
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if (downloadDirectory.isEmpty() || !QFileInfo(downloadDirectory).isDir())
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downloadDirectory = QDir::currentPath();
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downloadDirectoryLineEdit->setText(QDir::toNativeSeparators(downloadDirectory));
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formLayout->addRow(tr("&Download directory:"), downloadDirectoryLineEdit);
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formLayout->addRow(tr("Default &file:"), defaultFileLineEdit);
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launchCheckBox->setChecked(true);
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formLayout->addRow(launchCheckBox);
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QVBoxLayout *mainLayout = new QVBoxLayout(this);
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mainLayout->addLayout(formLayout);
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mainLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
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statusLabel->setWordWrap(true);
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mainLayout->addWidget(statusLabel);
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downloadButton->setDefault(true);
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connect(downloadButton, &QAbstractButton::clicked, this, &HttpWindow::downloadFile);
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QPushButton *quitButton = new QPushButton(tr("Quit"));
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quitButton->setAutoDefault(false);
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connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close);
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QDialogButtonBox *buttonBox = new QDialogButtonBox;
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buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
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buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
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mainLayout->addWidget(buttonBox);
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urlLineEdit->setFocus();
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}
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HttpWindow::~HttpWindow()
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{
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}
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void HttpWindow::startRequest(const QUrl &requestedUrl)
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{
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url = requestedUrl;
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httpRequestAborted = false;
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reply = qnam.get(QNetworkRequest(url));
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connect(reply, &QNetworkReply::finished, this, &HttpWindow::httpFinished);
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connect(reply, &QIODevice::readyRead, this, &HttpWindow::httpReadyRead);
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ProgressDialog *progressDialog = new ProgressDialog(url, this);
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progressDialog->setAttribute(Qt::WA_DeleteOnClose);
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connect(progressDialog, &QProgressDialog::canceled, this, &HttpWindow::cancelDownload);
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connect(reply, &QNetworkReply::downloadProgress, progressDialog, &ProgressDialog::networkReplyProgress);
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connect(reply, &QNetworkReply::finished, progressDialog, &ProgressDialog::hide);
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progressDialog->show();
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statusLabel->setText(tr("Downloading %1...").arg(url.toString()));
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}
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void HttpWindow::downloadFile()
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{
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const QString urlSpec = urlLineEdit->text().trimmed();
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if (urlSpec.isEmpty())
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return;
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const QUrl newUrl = QUrl::fromUserInput(urlSpec);
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if (!newUrl.isValid()) {
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QMessageBox::information(this, tr("Error"),
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tr("Invalid URL: %1: %2").arg(urlSpec, newUrl.errorString()));
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return;
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}
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QString fileName = newUrl.fileName();
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if (fileName.isEmpty())
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fileName = defaultFileLineEdit->text().trimmed();
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if (fileName.isEmpty())
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fileName = defaultFileName;
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QString downloadDirectory = QDir::cleanPath(downloadDirectoryLineEdit->text().trimmed());
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bool useDirectory = !downloadDirectory.isEmpty() && QFileInfo(downloadDirectory).isDir();
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if (useDirectory)
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fileName.prepend(downloadDirectory + '/');
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if (QFile::exists(fileName)) {
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if (QMessageBox::question(this, tr("Overwrite Existing File"),
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tr("There already exists a file called %1%2."
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" Overwrite?")
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.arg(fileName,
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useDirectory
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? QString()
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: QStringLiteral(" in the current directory")),
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QMessageBox::Yes | QMessageBox::No,
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QMessageBox::No)
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== QMessageBox::No) {
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return;
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}
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QFile::remove(fileName);
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}
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file = openFileForWrite(fileName);
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if (!file)
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return;
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downloadButton->setEnabled(false);
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// schedule the request
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startRequest(newUrl);
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}
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std::unique_ptr<QFile> HttpWindow::openFileForWrite(const QString &fileName)
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{
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std::unique_ptr<QFile> file(new QFile(fileName));
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if (!file->open(QIODevice::WriteOnly)) {
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QMessageBox::information(this, tr("Error"),
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tr("Unable to save the file %1: %2.")
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.arg(QDir::toNativeSeparators(fileName),
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file->errorString()));
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return nullptr;
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}
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return file;
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}
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void HttpWindow::cancelDownload()
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{
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statusLabel->setText(tr("Download canceled."));
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httpRequestAborted = true;
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reply->abort();
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downloadButton->setEnabled(true);
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}
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void HttpWindow::httpFinished()
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{
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QFileInfo fi;
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if (file) {
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fi.setFile(file->fileName());
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file->close();
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file.reset();
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}
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if (httpRequestAborted) {
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reply->deleteLater();
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reply = nullptr;
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return;
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}
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if (reply->error()) {
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QFile::remove(fi.absoluteFilePath());
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statusLabel->setText(tr("Download failed:\n%1.").arg(reply->errorString()));
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downloadButton->setEnabled(true);
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reply->deleteLater();
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reply = nullptr;
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return;
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}
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const QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
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reply->deleteLater();
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reply = nullptr;
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if (!redirectionTarget.isNull()) {
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const QUrl redirectedUrl = url.resolved(redirectionTarget.toUrl());
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if (QMessageBox::question(this, tr("Redirect"),
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tr("Redirect to %1 ?").arg(redirectedUrl.toString()),
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QMessageBox::Yes | QMessageBox::No) == QMessageBox::No) {
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QFile::remove(fi.absoluteFilePath());
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downloadButton->setEnabled(true);
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statusLabel->setText(tr("Download failed:\nRedirect rejected."));
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return;
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}
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file = openFileForWrite(fi.absoluteFilePath());
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if (!file) {
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downloadButton->setEnabled(true);
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return;
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}
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startRequest(redirectedUrl);
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return;
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}
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statusLabel->setText(tr("Downloaded %1 bytes to %2\nin\n%3")
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.arg(fi.size()).arg(fi.fileName(), QDir::toNativeSeparators(fi.absolutePath())));
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if (launchCheckBox->isChecked())
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QDesktopServices::openUrl(QUrl::fromLocalFile(fi.absoluteFilePath()));
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downloadButton->setEnabled(true);
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}
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void HttpWindow::httpReadyRead()
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{
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// this slot gets called every time the QNetworkReply has new data.
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// We read all of its new data and write it into the file.
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// That way we use less RAM than when reading it at the finished()
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// signal of the QNetworkReply
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if (file)
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file->write(reply->readAll());
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}
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void HttpWindow::enableDownloadButton()
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{
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downloadButton->setEnabled(!urlLineEdit->text().isEmpty());
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}
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void HttpWindow::slotAuthenticationRequired(QNetworkReply *, QAuthenticator *authenticator)
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{
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QDialog authenticationDialog;
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Ui::Dialog ui;
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ui.setupUi(&authenticationDialog);
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authenticationDialog.adjustSize();
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ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm(), url.host()));
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// Did the URL have information? Fill the UI
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// This is only relevant if the URL-supplied credentials were wrong
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ui.userEdit->setText(url.userName());
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ui.passwordEdit->setText(url.password());
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if (authenticationDialog.exec() == QDialog::Accepted) {
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authenticator->setUser(ui.userEdit->text());
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authenticator->setPassword(ui.passwordEdit->text());
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}
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}
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#ifndef QT_NO_SSL
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void HttpWindow::sslErrors(QNetworkReply *, const QList<QSslError> &errors)
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{
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QString errorString;
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for (const QSslError &error : errors) {
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if (!errorString.isEmpty())
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errorString += '\n';
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errorString += error.errorString();
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}
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if (QMessageBox::warning(this, tr("SSL Errors"),
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tr("One or more SSL errors has occurred:\n%1").arg(errorString),
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QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {
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reply->ignoreSslErrors();
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}
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}
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#endif
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