Integrate file uploads and downloads with plasma's job tracker

Implements #538

src/filetransferpseudojob.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2022 Tobias Fella <fella@posteo.de>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <KJob>
+#include <QString>
+
+class FileTransferPseudoJob : public KJob
+{
+public:
+    enum Operation {
+        Download,
+        Upload,
+    };
+    Q_ENUM(Operation);
+    FileTransferPseudoJob(Operation operation, const QString &srcDest, const QString &path);
+    void fileTransferProgress(QString id, qint64 progress, qint64 total);
+    void fileTransferCompleted(QString id, QUrl localFile);
+    void fileTransferFailed(QString id, QString errorMessage = {});
+
+    void start() override;
+
+private:
+    QString m_path;
+    QString m_eventId;
+    Operation m_operation;
+};