Add "Check for updates" Feature

This patch adds a check for updates feature.

It connects to http://subsurface.hohndel.org/updatecheck.html to check for
any new versions. It then prompts the user with a download link if an
update is available.

Signed-off-by: Joseph W. Joshua <joejoshw@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/qt-ui/updatemanager.cpp b/qt-ui/updatemanager.cpp
new file mode 100644
index 000000000..e721f914c
--- /dev/null
+++ b/qt-ui/updatemanager.cpp
@@ -0,0 +1,67 @@
+#include "updatemanager.h"
+#include <QtNetwork>
+#include <QMessageBox>
+#include "subsurfacewebservices.h"
+#include "ssrf-version.h"
+
+UpdateManager::UpdateManager(QObject *parent) :
+	QObject(parent)
+{
+	manager = SubsurfaceWebServices::manager();
+	connect (manager, SIGNAL(finished(QNetworkReply*)), SLOT(requestReceived(QNetworkReply*)));
+}
+
+void UpdateManager::checkForUpdates()
+{
+	QString os;
+
+#if defined(Q_OS_WIN)
+	os = "win";
+#elif defined(Q_OS_MAC)
+	os = "osx";
+#else
+	os = "unknown";
+#endif
+
+	QString version = VERSION_STRING;
+	QString url = QString("http://subsurface.hohndel.org/updatecheck.html?os=%1&ver=%2").arg(os, version);
+	manager->get(QNetworkRequest(QUrl(url)));
+}
+
+void UpdateManager::requestReceived(QNetworkReply *reply)
+{
+	QMessageBox msgbox;
+	QString msgTitle = tr("Check for updates.");
+	QString msgText = tr("<h3>Subsurface was unable to check for updates.</h3>");
+
+
+	if (reply->error() != QNetworkReply::NoError) {
+		//Network Error
+		msgText = msgText + tr("<br/><b>The following error occurred:</b><br/>") + reply->errorString()
+				+ tr("<br/><br/><b>Please check your internet connection.</b>");
+	} else {
+		//No network error
+		QString response(reply->readAll());
+		QString responseBody = response.split("\"").at(1);
+
+		msgbox.setIcon(QMessageBox::Information);
+
+		if (responseBody == "OK") {
+			msgText = tr("You are using the latest version of subsurface.");
+		} else if (responseBody.startsWith("http")) {
+			msgText = tr("A new version of subsurface is available.<br/>Click on:<br/><a href=\"%1\">%1</a><br/> to download it.")
+					.arg(responseBody);
+		} else if (responseBody.startsWith("Latest version")) {
+			msgText = tr("<b>A new version of subsurface is available.</b><br/><br/>%1")
+					.arg(responseBody);
+		} else {
+			msgText = tr("There was an error while trying to check for updates.<br/><br/>%1").arg(responseBody);
+			msgbox.setIcon(QMessageBox::Warning);
+		}
+	}
+
+	msgbox.setWindowTitle(msgTitle);
+	msgbox.setText(msgText);
+	msgbox.setTextFormat(Qt::RichText);
+	msgbox.exec();
+}