dbhub: Add very basic support for opening remote files

This adds some initial support for opening remote files. You can enter a URL and DB4S will try to download the file. When successful you'll be able to specify a place and name to save the file under, and after saving it locally to disk it'll be opened just like any local database file. See the included TODO comments for missing features. Most notably missing is the HTTPS and certificate handling code. Also any support for storing the remote source of a database is lacking.
2026-01-20 02:50:46 -06:00 · 2016-10-24 22:49:32 +02:00
parent 31dffa6afc
commit 4d26624bda
6 changed files with 139 additions and 3 deletions
--- a/src/RemoteDatabase.cpp
+++ b/src/RemoteDatabase.cpp
@@ -0,0 +1,93 @@
+#include <QApplication>
+#include <QNetworkAccessManager>
+#include <QMessageBox>
+#include <QNetworkReply>
+#include <QFile>
+
+#include "RemoteDatabase.h"
+#include "version.h"
+#include "FileDialog.h"
+
+RemoteDatabase::RemoteDatabase() :
+    m_manager(new QNetworkAccessManager)
+{
+    // TODO Set up SSL configuration here
+
+    // TODO Add support for proxies here
+
+    // Set up signals
+    connect(m_manager, &QNetworkAccessManager::finished, this, &RemoteDatabase::gotReply);
+    connect(m_manager, &QNetworkAccessManager::encrypted, this, &RemoteDatabase::gotEncrypted);
+    connect(m_manager, &QNetworkAccessManager::sslErrors, this, &RemoteDatabase::gotError);
+}
+
+RemoteDatabase::~RemoteDatabase()
+{
+    delete m_manager;
+}
+
+void RemoteDatabase::fetchDatabase(const QString& url)
+{
+    // Check if network is accessible. If not, abort right here
+    if(m_manager->networkAccessible() == QNetworkAccessManager::NotAccessible)
+    {
+        QMessageBox::warning(0, qApp->applicationName(), tr("Error: The network is not accessible."));
+        return;
+    }
+
+    // Build network request
+    QNetworkRequest request;
+    request.setUrl(url);
+    request.setRawHeader("User-Agent", QString("%1 %2").arg(qApp->organizationName()).arg(APP_VERSION).toUtf8());
+
+    // TODO Set SSL configuration here
+
+    // Fetch database
+    m_manager->get(request);
+
+    // TODO Monitor and show download progress. Also add option to cancel running downloads
+}
+
+void RemoteDatabase::gotEncrypted(QNetworkReply* /*reply*/)
+{
+    // TODO Check SSL configuration here and abort reply if it's not good
+}
+
+void RemoteDatabase::gotReply(QNetworkReply* reply)
+{
+    // Check if request was successful
+    if(reply->error() != QNetworkReply::NoError)
+    {
+        QMessageBox::warning(0, qApp->applicationName(),
+                             tr("Error opening remote database file from %1.\n%2").arg(reply->url().toString()).arg(reply->errorString()));
+        reply->deleteLater();
+        return;
+    }
+
+    // Ask user where to store the database file
+    QString saveFileAs = FileDialog::getSaveFileName(0, qApp->applicationName(), FileDialog::getSqlDatabaseFileFilter(), reply->url().fileName());
+    if(!saveFileAs.isEmpty())
+    {
+        // Save the downloaded data under the selected file name
+        QFile file(saveFileAs);
+        file.open(QIODevice::WriteOnly);
+        file.write(reply->readAll());
+        file.close();
+
+        // Tell the application to open this file
+        emit openFile(saveFileAs);
+    }
+
+    // Delete reply later, i.e. after returning from this slot function
+    reply->deleteLater();
+}
+
+void RemoteDatabase::gotError(QNetworkReply* reply, const QList<QSslError>& errors)
+{
+    // Build an error message and short it to the user
+    QString message = tr("Error opening remote database file from %1.\n%2").arg(reply->url().toString()).arg(errors.at(0).errorString());
+    QMessageBox::warning(0, qApp->applicationName(), message);
+
+    // Delete reply later, i.e. after returning from this slot function
+    reply->deleteLater();
+}