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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 #include <QtNetwork>

    44 

    45 #include "httpwindow.h"

    46 #include "ui_authenticationdialog.h"

    47 

    48 HttpWindow::HttpWindow(QWidget *parent)

    49     : QDialog(parent)

    50 {

    51 #ifndef QT_NO_OPENSSL

    52     urlLineEdit = new QLineEdit("https://qt.nokia.com/");

    53 #else

    54     urlLineEdit = new QLineEdit("http://qt.nokia.com/");

    55 #endif

    56 

    57     urlLabel = new QLabel(tr("&URL:"));

    58     urlLabel->setBuddy(urlLineEdit);

    59     statusLabel = new QLabel(tr("Please enter the URL of a file you want to "

    60                                 "download."));

    61 

    62     downloadButton = new QPushButton(tr("Download"));

    63     downloadButton->setDefault(true);

    64     quitButton = new QPushButton(tr("Quit"));

    65     quitButton->setAutoDefault(false);

    66 

    67     buttonBox = new QDialogButtonBox;

    68     buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);

    69     buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

    70 

    71     progressDialog = new QProgressDialog(this);

    72 

    73     connect(urlLineEdit, SIGNAL(textChanged(QString)),

    74             this, SLOT(enableDownloadButton()));

    75 

    76     connect(&qnam, SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),

    77             this, SLOT(slotAuthenticationRequired(QNetworkReply*,QAuthenticator*)));

    78 #ifndef QT_NO_OPENSSL

    79     connect(&qnam, SIGNAL(sslErrors(QNetworkReply*,QList<QSslError>)),

    80             this, SLOT(sslErrors(QNetworkReply*,QList<QSslError>)));

    81 #endif

    82     connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));

    83     connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));

    84     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

    85 

    86     QHBoxLayout *topLayout = new QHBoxLayout;

    87     topLayout->addWidget(urlLabel);

    88     topLayout->addWidget(urlLineEdit);

    89 

    90     QVBoxLayout *mainLayout = new QVBoxLayout;

    91     mainLayout->addLayout(topLayout);

    92     mainLayout->addWidget(statusLabel);

    93     mainLayout->addWidget(buttonBox);

    94     setLayout(mainLayout);

    95 

    96     setWindowTitle(tr("HTTP"));

    97     urlLineEdit->setFocus();

    98 }

    99 

   100 void HttpWindow::startRequest(QUrl url)

   101 {

   102     reply = qnam.get(QNetworkRequest(url));

   103     connect(reply, SIGNAL(finished()),

   104             this, SLOT(httpFinished()));

   105     connect(reply, SIGNAL(readyRead()),

   106             this, SLOT(httpReadyRead()));

   107     connect(reply, SIGNAL(downloadProgress(qint64,qint64)),

   108             this, SLOT(updateDataReadProgress(qint64,qint64)));

   109 }

   110 

   111 void HttpWindow::downloadFile()

   112 {

   113     url = urlLineEdit->text();

   114 

   115     QFileInfo fileInfo(url.path());

   116     QString fileName = fileInfo.fileName();

   117     if (fileName.isEmpty())

   118         fileName = "index.html";

   119 

   120     if (QFile::exists(fileName)) {

   121         if (QMessageBox::question(this, tr("HTTP"), 

   122                                   tr("There already exists a file called %1 in "

   123                                      "the current directory. Overwrite?").arg(fileName),

   124                                   QMessageBox::Yes|QMessageBox::No, QMessageBox::No)

   125             == QMessageBox::No)

   126             return;

   127         QFile::remove(fileName);

   128     }

   129 

   130     file = new QFile(fileName);

   131     if (!file->open(QIODevice::WriteOnly)) {

   132         QMessageBox::information(this, tr("HTTP"),

   133                                  tr("Unable to save the file %1: %2.")

   134                                  .arg(fileName).arg(file->errorString()));

   135         delete file;

   136         file = 0;

   137         return;

   138     }

   139 

   140 

   141     progressDialog->setWindowTitle(tr("HTTP"));

   142     progressDialog->setLabelText(tr("Downloading %1.").arg(fileName));

   143     downloadButton->setEnabled(false);

   144 

   145     // schedule the request

   146     httpRequestAborted = false;

   147     startRequest(url);

   148 }

   149 

   150 void HttpWindow::cancelDownload()

   151 {

   152     statusLabel->setText(tr("Download canceled."));

   153     httpRequestAborted = true;

   154     reply->abort();

   155     downloadButton->setEnabled(true);

   156 }

   157 

   158 void HttpWindow::httpFinished()

   159 {

   160     if (httpRequestAborted) {

   161         if (file) {

   162             file->close();

   163             file->remove();

   164             delete file;

   165             file = 0;

   166         }

   167         reply->deleteLater();

   168         progressDialog->hide();

   169         return;

   170     }

   171 

   172     progressDialog->hide();

   173     file->flush();

   174     file->close();

   175 

   176 

   177     QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);

   178     if (reply->error()) {

   179         file->remove();

   180         QMessageBox::information(this, tr("HTTP"),

   181                                  tr("Download failed: %1.")

   182                                  .arg(reply->errorString()));

   183         downloadButton->setEnabled(true);

   184     } else if (!redirectionTarget.isNull()) {        

   185         QUrl newUrl = url.resolved(redirectionTarget.toUrl());

   186         if (QMessageBox::question(this, tr("HTTP"),

   187                                   tr("Redirect to %1 ?").arg(newUrl.toString()),

   188                                   QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {

   189             url = newUrl;

   190             reply->deleteLater();

   191             file->open(QIODevice::WriteOnly);

   192             file->resize(0);

   193             startRequest(url);

   194             return;

   195         }

   196     } else {

   197         QString fileName = QFileInfo(QUrl(urlLineEdit->text()).path()).fileName();

   198         statusLabel->setText(tr("Downloaded %1 to current directory.").arg(fileName));

   199         downloadButton->setEnabled(true);

   200     }

   201 

   202     reply->deleteLater();

   203     reply = 0;

   204     delete file;

   205     file = 0;

   206 }

   207 

   208 void HttpWindow::httpReadyRead()

   209 {

   210     // this slot gets called everytime the QNetworkReply has new data.

   211     // We read all of its new data and write it into the file.

   212     // That way we use less RAM than when reading it at the finished()

   213     // signal of the QNetworkReply

   214     if (file)

   215         file->write(reply->readAll());

   216 }

   217 

   218 void HttpWindow::updateDataReadProgress(qint64 bytesRead, qint64 totalBytes)

   219 {

   220     if (httpRequestAborted)

   221         return;

   222 

   223     progressDialog->setMaximum(totalBytes);

   224     progressDialog->setValue(bytesRead);

   225 }

   226 

   227 void HttpWindow::enableDownloadButton()

   228 {

   229     downloadButton->setEnabled(!urlLineEdit->text().isEmpty());

   230 }

   231 

   232 void HttpWindow::slotAuthenticationRequired(QNetworkReply*,QAuthenticator *authenticator)

   233 {

   234     QDialog dlg;

   235     Ui::Dialog ui;

   236     ui.setupUi(&dlg);

   237     dlg.adjustSize();

   238     ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm()).arg(url.host()));

   239 

   240     // Did the URL have information? Fill the UI

   241     // This is only relevant if the URL-supplied credentials were wrong

   242     ui.userEdit->setText(url.userName());

   243     ui.passwordEdit->setText(url.password());

   244 

   245     if (dlg.exec() == QDialog::Accepted) {

   246         authenticator->setUser(ui.userEdit->text());

   247         authenticator->setPassword(ui.passwordEdit->text());

   248     }

   249 }

   250 

   251 #ifndef QT_NO_OPENSSL

   252 void HttpWindow::sslErrors(QNetworkReply*,const QList<QSslError> &errors)

   253 {

   254     QString errorString;

   255     foreach (const QSslError &error, errors) {

   256         if (!errorString.isEmpty())

   257             errorString += ", ";

   258         errorString += error.errorString();

   259     }

   260     

   261     if (QMessageBox::warning(this, tr("HTTP"),

   262                              tr("One or more SSL errors has occurred: %1").arg(errorString),

   263                              QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {

   264         reply->ignoreSslErrors();

   265     }

   266 }

   267 #endif