added basic version fetching

src/singletons/updatemanager.cpp

@@ -0,0 +1,54 @@
+#include "updatemanager.hpp"
+
+#include "util/networkrequest.hpp"
+#include "version.hpp"
+
+namespace chatterino {
+namespace singletons {
+
+UpdateManager::UpdateManager()
+    : currentVersion(CHATTERINO_VERSION)
+{
+}
+
+UpdateManager &UpdateManager::getInstance()
+{
+    static UpdateManager instance;
+    return instance;
+}
+
+const QString &UpdateManager::getCurrentVersion() const
+{
+    return this->getCurrentVersion();
+}
+
+const QString &UpdateManager::getOnlineVersion() const
+{
+    return this->getOnlineVersion();
+}
+
+void UpdateManager::checkForUpdates()
+{
+    QString url = "https://notitia.chatterino.com/version/chatterino/" CHATTERINO_OS "/stable";
+
+    util::NetworkRequest req(url);
+    req.setTimeout(20000);
+    req.getJSON([this](QJsonDocument &document) {
+        if (document.isEmpty()) {
+            qDebug() << "error updating";
+            return;
+        }
+
+        QJsonValue version_val = document.object().value("version");
+        if (!version_val.isString()) {
+            qDebug() << "error updating";
+            return;
+        }
+
+        this->onlineVersion = version_val.toString();
+        this->onlineVersionUpdated.invoke();
+    });
+}
+
+}  // namespace singletons
+}  // namespace chatterino