Show error message when the installer failed to download

launcher/include/gameinstaller.h

@@ -19,6 +19,7 @@ public:
 
 Q_SIGNALS:
     void installFinished();
+    void error(QString message);
 
 private:
     LauncherCore &m_launcher;

launcher/src/assetupdater.cpp

@@ -96,6 +96,11 @@ void AssetUpdater::update()
             Q_EMIT launcher.stageChanged("Checking for Dalamud updates...");
 
             QByteArray str = reply->readAll();
+            if (str.isEmpty()) {
+                Q_EMIT launcher.loginError("Could not check for Dalamud updates.");
+                return;
+            }
+
             // for some god forsaken reason, the version string comes back as raw
             // bytes, ex: \xFF\xFE{\x00\"\x00""A\x00s\x00s\x00""e\x00m\x00 so we
             // start at the first character of the json '{' and work our way up.

launcher/src/gameinstaller.cpp

@@ -29,6 +29,11 @@ void GameInstaller::installGame()
 
     auto reply = m_launcher.mgr->get(request);
     QObject::connect(reply, &QNetworkReply::finished, [this, reply, installDirectory] {
+        if (reply->error() != QNetworkReply::NetworkError::NoError) {
+            Q_EMIT error(QStringLiteral("An error has occurred when downloading the installer:\n%1").arg(reply->errorString()));
+            return;
+        }
+
         const QDir dataDir = QStandardPaths::writableLocation(QStandardPaths::TempLocation);
 
         const QByteArray data = reply->readAll();

launcher/ui/Setup/InstallProgress.qml

@@ -19,6 +19,17 @@ Kirigami.Page {
         text: i18n("Installing...")
     }
 
+    Kirigami.PromptDialog {
+        id: errorDialog
+        title: i18n("Install error")
+
+        showCloseButton: false
+        standardButtons: Kirigami.Dialog.Ok
+
+        onAccepted: applicationWindow().pageStack.layers.pop()
+        onRejected: applicationWindow().pageStack.layers.pop()
+    }
+
     Component.onCompleted: gameInstaller.installGame()
 
     Connections {
@@ -27,5 +38,10 @@ Kirigami.Page {
         function onInstallFinished() {
             applicationWindow().checkSetup()
         }
+
+        function onError(message) {
+            errorDialog.subtitle = message
+            errorDialog.open()
+        }
     }
 }