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diff --git a/extensions/source/update/check/download.hxx b/extensions/source/update/check/download.hxx
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+++ b/extensions/source/update/check/download.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_EXTENSIONS_SOURCE_UPDATE_CHECK_DOWNLOAD_HXX
+#define INCLUDED_EXTENSIONS_SOURCE_UPDATE_CHECK_DOWNLOAD_HXX
+
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <rtl/ref.hxx>
+#include <rtl/ustring.hxx>
+#include <osl/conditn.hxx>
+#include <salhelper/simplereferenceobject.hxx>
+
+struct DownloadInteractionHandler : public virtual salhelper::SimpleReferenceObject
+{
+    virtual bool checkDownloadDestination(const OUString& rFileName) = 0;
+
+    // called if the destination file already exists, but resume is false
+    virtual bool downloadTargetExists(const OUString& rFileName) = 0;
+
+    // called when curl reports an error
+    virtual void downloadStalled(const OUString& rErrorMessage) = 0;
+
+    // progress handler
+    virtual void downloadProgressAt(sal_Int8 nPercent) = 0;
+
+    // called on first progress notification
+    virtual void downloadStarted(const OUString& rFileName, sal_Int64 nFileSize) = 0;
+
+    // called when download has been finished
+    virtual void downloadFinished(const OUString& rFileName) = 0;
+
+protected:
+    virtual ~DownloadInteractionHandler() override {}
+};
+
+
+class Download
+{
+public:
+    Download(const css::uno::Reference< css::uno::XComponentContext >& xContext,
+             const rtl::Reference< DownloadInteractionHandler >& rHandler) : m_xContext(xContext), m_aHandler(rHandler) {};
+
+    // returns true when the content of rURL was successfully written to rLocalFile
+    bool start(const OUString& rURL, const OUString& rFile, const OUString& rDestinationDir);
+
+    // stops the download after the next write operation
+    void stop();
+
+protected:
+
+    // Determines the appropriate proxy settings for the given URL. Returns true if a proxy should be used
+    void getProxyForURL(const OUString& rURL, OString& rHost, sal_Int32& rPort) const;
+
+private:
+    osl::Condition m_aCondition;
+    const css::uno::Reference< css::uno::XComponentContext >& m_xContext;
+    const rtl::Reference< DownloadInteractionHandler > m_aHandler;
+};
+
+#endif // INCLUDED_EXTENSIONS_SOURCE_UPDATE_CHECK_DOWNLOAD_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */