+ issue #0001705: Download manager does not follow redirect (HTTP status 302)

src/Gui/DownloadItem.cpp

@@ -464,7 +464,8 @@ void DownloadItem::metaDataChanged()
                 header.chop(1);
             m_fileName = QUrl::fromPercentEncoding(header);
         }
-        else {
+        // Sometimes "filename=" and "filename*=UTF-8''" is set.
+        // So, search for this too.
         index = header.indexOf("filename*=UTF-8''");
         if (index >= 0) {
             header = header.mid(index+17);
@@ -475,7 +476,6 @@ void DownloadItem::metaDataChanged()
             m_fileName = QUrl::fromPercentEncoding(header);
         }
     }
-    }
 
     QVariant statusCode = m_reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
     if (!statusCode.isValid())

src/Gui/DownloadManager.cpp

@@ -71,6 +71,8 @@ DownloadManager::DownloadManager(QWidget *parent)
     m_model = new DownloadModel(this);
     ui->downloadsView->setModel(m_model);
     connect(ui->cleanupButton, SIGNAL(clicked()), this, SLOT(cleanup()));
+    connect(m_manager, SIGNAL(finished(QNetworkReply*)),
+            this, SLOT(replyFinished(QNetworkReply*)));
     load();
 
     Gui::DockWindowManager* pDockMgr = Gui::DockWindowManager::instance();
@@ -108,11 +110,57 @@ int DownloadManager::activeDownloads() const
     return count;
 }
 
+QUrl DownloadManager::redirectUrl(const QUrl& url) const
+{
+    QUrl redirectUrl = url;
+    if (url.host() == QLatin1String("www.dropbox.com")) {
+        QList< QPair<QString, QString> > query = url.queryItems();
+        for (QList< QPair<QString, QString> >::iterator it = query.begin(); it != query.end(); ++it) {
+            if (it->first == QLatin1String("dl") && it->second == QLatin1String("0\r\n")) {
+                redirectUrl.removeQueryItem(QLatin1String("dl"));
+                redirectUrl.addQueryItem(QLatin1String("dl"), QLatin1String("1\r\n"));
+                break;
+            }
+        }
+    }
+
+    return redirectUrl;
+}
+
+void DownloadManager::replyFinished(QNetworkReply* reply)
+{
+    // The 'requestFileName' is used to store the argument passed by 'download()'
+    // and to also distinguish between replies created by 'download()' and
+    // this method.
+    // Replies from this method shouldn't be further examined because it's not
+    // assumed to get re-directed urls over several steps.
+    QVariant var = reply->property("requestFileName");
+    if (var.isValid()) {
+        bool requestFileName = reply->property("requestFileName").toBool();
+
+        QUrl url = reply->url();
+
+        // If this is a redirected url use this instead
+        QUrl redirectUrl = reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl();
+        if (!redirectUrl.isEmpty()) {
+            url = redirectUrl;
+        }
+
+        // start the actual download now
+        handleUnsupportedContent(m_manager->get(QNetworkRequest(url)), requestFileName);
+    }
+
+    reply->deleteLater();
+}
+
 void DownloadManager::download(const QNetworkRequest &request, bool requestFileName)
 {
     if (request.url().isEmpty())
         return;
-    handleUnsupportedContent(m_manager->get(request), requestFileName);
+
+    // postpone this reply until we can examine it in replyFinished
+    QNetworkReply* reply = m_manager->get(request);
+    reply->setProperty("requestFileName", QVariant(requestFileName));
 }
 
 void DownloadManager::handleUnsupportedContent(QNetworkReply *reply, bool requestFileName)

src/Gui/DownloadManager.h

@@ -65,6 +65,7 @@ public:
     RemovePolicy removePolicy() const;
     void setRemovePolicy(RemovePolicy policy);
     void closeEvent(QCloseEvent* e);
+    QUrl redirectUrl(const QUrl&) const;
 
 public Q_SLOTS:
     void download(const QNetworkRequest &request, bool requestFileName = false);
@@ -76,6 +77,7 @@ public Q_SLOTS:
 private Q_SLOTS:
     void save() const;
     void updateRow();
+    void replyFinished(QNetworkReply* reply);
 
 private:
     void addItem(DownloadItem *item);

src/Gui/MainWindow.cpp

@@ -1585,7 +1585,8 @@ void MainWindow::loadUrls(App::Document* doc, const QList<QUrl>& url)
             }
         }
         else if (it->scheme().toLower() == QLatin1String("http")) {
-            Gui::Dialog::DownloadManager::getInstance()->download(*it);
+            Gui::Dialog::DownloadManager* dm = Gui::Dialog::DownloadManager::getInstance();
+            dm->download(dm->redirectUrl(*it));
         }
 //#ifndef QT_NO_OPENSSL
         else if (it->scheme().toLower() == QLatin1String("https")) {
@@ -1594,7 +1595,8 @@ void MainWindow::loadUrls(App::Document* doc, const QList<QUrl>& url)
                 url.removeEncodedQueryItem(QByteArray("sid"));
                 url.setScheme(QLatin1String("http"));
             }
-            Gui::Dialog::DownloadManager::getInstance()->download(url);
+            Gui::Dialog::DownloadManager* dm = Gui::Dialog::DownloadManager::getInstance();
+            dm->download(dm->redirectUrl(url));
         }
 //#endif
         else if (it->scheme().toLower() == QLatin1String("ftp")) {