Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 894 insertions, 0 deletions

diff --git a/desktop/source/app/updater.cxx b/desktop/source/app/updater.cxx
new file mode 100644
index 000000000..b4be0f7bc
--- /dev/null
+++ b/desktop/source/app/updater.cxx
@@ -0,0 +1,894 @@
+/* -*- 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/.
+ */
+
+#include "updater.hxx"
+
+#if UNX
+#include <unistd.h>
+#include <errno.h>
+
+#endif
+
+#ifdef _WIN32
+#include <comphelper/windowsStart.hxx>
+#endif
+
+#include <fstream>
+#include <config_folders.h>
+#include <rtl/bootstrap.hxx>
+
+#include <officecfg/Office/Update.hxx>
+
+#include <rtl/ustring.hxx>
+#include <unotools/tempfile.hxx>
+#include <unotools/configmgr.hxx>
+#include <osl/file.hxx>
+#include <rtl/process.h>
+#include <sal/log.hxx>
+
+#include <curl/curl.h>
+
+#include <orcus/json_document_tree.hpp>
+#include <orcus/config.hpp>
+#include <orcus/pstring.hpp>
+#include <comphelper/hash.hxx>
+
+#include <com/sun/star/container/XNameAccess.hpp>
+
+#include <officecfg/Setup.hxx>
+
+#include <functional>
+#include <memory>
+#include <set>
+
+namespace {
+
+class error_updater : public std::exception
+{
+    OString maStr;
+public:
+
+    error_updater(const OString& rStr):
+        maStr(rStr)
+    {
+    }
+
+    virtual const char* what() const  throw() override
+    {
+        return maStr.getStr();
+    }
+};
+
+#ifdef UNX
+static const char kUserAgent[] = "LibreOffice UpdateChecker/1.0 (Linux)";
+#else
+static const char kUserAgent[] = "LibreOffice UpdateChecker/1.0 (unknown platform)";
+#endif
+
+#ifdef UNX
+const char* const pUpdaterName = "updater";
+const char* const pSofficeExeName = "soffice";
+#elif defined(_WIN32)
+const char* pUpdaterName = "updater.exe";
+const char* pSofficeExeName = "soffice.exe";
+#else
+#error "Need implementation"
+#endif
+
+OUString normalizePath(const OUString& rPath)
+{
+    OUString aPath =  rPath.replaceAll("//", "/");
+
+    // remove final /
+    if (aPath.endsWith("/"))
+    {
+        aPath = aPath.copy(0, aPath.getLength() - 1);
+    }
+
+    while (aPath.indexOf("/..") != -1)
+    {
+        sal_Int32 nIndex = aPath.indexOf("/..");
+        sal_Int32 i = nIndex - 1;
+        for (; i > 0; --i)
+        {
+            if (aPath[i] == '/')
+                break;
+        }
+
+        OUString aTempPath = aPath;
+        aPath = aTempPath.copy(0, i) + aPath.copy(nIndex + 3);
+    }
+
+    return aPath.replaceAll("\\", "/");
+}
+
+void CopyFileToDir(const OUString& rTempDirURL, const OUString & rFileName, const OUString& rOldDir)
+{
+    OUString aSourceURL = rOldDir + "/" + rFileName;
+    OUString aDestURL = rTempDirURL + "/" + rFileName;
+
+    osl::File::RC eError = osl::File::copy(aSourceURL, aDestURL);
+    if (eError != osl::File::E_None)
+    {
+        SAL_WARN("desktop.updater", "could not copy the file to a temp directory: " << rFileName);
+        throw std::exception();
+    }
+}
+
+OUString getPathFromURL(const OUString& rURL)
+{
+    OUString aPath;
+    osl::FileBase::getSystemPathFromFileURL(rURL, aPath);
+
+    return normalizePath(aPath);
+}
+
+void CopyUpdaterToTempDir(const OUString& rInstallDirURL, const OUString& rTempDirURL)
+{
+    OUString aUpdaterName = OUString::fromUtf8(pUpdaterName);
+    CopyFileToDir(rTempDirURL, aUpdaterName, rInstallDirURL);
+}
+
+#ifdef UNX
+typedef char CharT;
+#define tstrncpy std::strncpy
+#elif defined(_WIN32)
+typedef wchar_t CharT;
+#define tstrncpy std::wcsncpy
+#else
+#error "Need an implementation"
+#endif
+
+void createStr(const OUString& rStr, CharT** pArgs, size_t i)
+{
+#ifdef UNX
+    OString aStr = OUStringToOString(rStr, RTL_TEXTENCODING_UTF8);
+#elif defined(_WIN32)
+    OUString aStr = rStr;
+#else
+#error "Need an implementation"
+#endif
+    CharT* pStr = new CharT[aStr.getLength() + 1];
+    tstrncpy(pStr, (CharT*)aStr.getStr(), aStr.getLength());
+    pStr[aStr.getLength()] = '\0';
+    pArgs[i] = pStr;
+}
+
+CharT** createCommandLine()
+{
+    OUString aInstallDir = Updater::getInstallationPath();
+
+    size_t nCommandLineArgs = rtl_getAppCommandArgCount();
+    size_t nArgs = 8 + nCommandLineArgs;
+    CharT** pArgs = new CharT*[nArgs];
+    {
+        OUString aUpdaterName = OUString::fromUtf8(pUpdaterName);
+        createStr(aUpdaterName, pArgs, 0);
+    }
+    {
+        // directory with the patch log
+        OUString aPatchDir = Updater::getPatchDirURL();
+        rtl::Bootstrap::expandMacros(aPatchDir);
+        OUString aTempDirPath = getPathFromURL(aPatchDir);
+        Updater::log("Patch Dir: " + aTempDirPath);
+        createStr(aTempDirPath, pArgs, 1);
+    }
+    {
+        // the actual update directory
+        Updater::log("Install Dir: " + aInstallDir);
+        createStr(aInstallDir, pArgs, 2);
+    }
+    {
+        // the temporary updated build
+        Updater::log("Working Dir: " + aInstallDir);
+        createStr(aInstallDir, pArgs, 3);
+    }
+    {
+#ifdef UNX
+        OUString aPID("0");
+#elif defined(_WIN32)
+        oslProcessInfo aInfo;
+        aInfo.Size = sizeof(oslProcessInfo);
+        osl_getProcessInfo(nullptr, osl_Process_IDENTIFIER, &aInfo);
+        OUString aPID = OUString::number(aInfo.Ident);
+#else
+#error "Need an implementation"
+#endif
+        createStr(aPID, pArgs, 4);
+    }
+    {
+        OUString aExeDir = Updater::getExecutableDirURL();
+        OUString aSofficePath = getPathFromURL(aExeDir);
+        Updater::log("soffice Path: " + aSofficePath);
+        createStr(aSofficePath, pArgs, 5);
+    }
+    {
+        // the executable to start after the successful update
+        OUString aExeDir = Updater::getExecutableDirURL();
+        OUString aSofficePathURL = aExeDir + OUString::fromUtf8(pSofficeExeName);
+        OUString aSofficePath = getPathFromURL(aSofficePathURL);
+        createStr(aSofficePath, pArgs, 6);
+    }
+
+    // add the command line arguments from the soffice list
+    for (size_t i = 0; i < nCommandLineArgs; ++i)
+    {
+        OUString aCommandLineArg;
+        rtl_getAppCommandArg(i, &aCommandLineArg.pData);
+        createStr(aCommandLineArg, pArgs, 7 + i);
+    }
+
+    pArgs[nArgs - 1] = nullptr;
+
+    return pArgs;
+}
+
+struct update_file
+{
+    OUString aURL;
+    OUString aHash;
+    size_t nSize;
+};
+
+struct language_file
+{
+    update_file aUpdateFile;
+    OUString aLangCode;
+};
+
+struct update_info
+{
+    OUString aFromBuildID;
+    OUString aSeeAlsoURL;
+    OUString aMessage;
+
+    update_file aUpdateFile;
+    std::vector<language_file> aLanguageFiles;
+};
+
+bool isUserWritable(const OUString& rFileURL)
+{
+    osl::FileStatus aStatus(osl_FileStatus_Mask_Attributes);
+    osl::DirectoryItem aDirectoryItem;
+
+    osl::FileBase::RC eRes = osl::DirectoryItem::get(rFileURL, aDirectoryItem);
+    if (eRes != osl::FileBase::E_None)
+    {
+        Updater::log("Could not get the directory item for: " + rFileURL);
+        return false;
+    }
+
+    osl::FileBase::RC eResult = aDirectoryItem.getFileStatus(aStatus);
+    if (eResult != osl::FileBase::E_None)
+    {
+        Updater::log("Could not get the file status for: " + rFileURL);
+        return false;
+    }
+
+    bool bReadOnly = (aStatus.getAttributes() & static_cast<sal_uInt64>(osl_File_Attribute_ReadOnly)) != 0;
+    if (bReadOnly)
+    {
+        Updater::log("Update location as determined by: " + rFileURL + " is read-only.");
+        return false;
+    }
+
+    return true;
+}
+
+}
+
+bool update()
+{
+    utl::TempFile aTempDir(nullptr, true);
+    OUString aTempDirURL = aTempDir.GetURL();
+    CopyUpdaterToTempDir(Updater::getExecutableDirURL(), aTempDirURL);
+
+    OUString aUpdaterPath = getPathFromURL(aTempDirURL + "/" + OUString::fromUtf8(pUpdaterName));
+
+    Updater::log("Calling the updater with parameters: ");
+    CharT** pArgs = createCommandLine();
+
+    bool bSuccess = true;
+    const char* pUpdaterTestReplace = std::getenv("LIBO_UPDATER_TEST_REPLACE");
+    if (!pUpdaterTestReplace)
+    {
+#if UNX
+        OString aPath = OUStringToOString(aUpdaterPath, RTL_TEXTENCODING_UTF8);
+        if (execv(aPath.getStr(), pArgs))
+        {
+            printf("execv failed with error %d %s\n",errno,strerror(errno));
+            bSuccess = false;
+        }
+#elif defined(_WIN32)
+        bSuccess = WinLaunchChild((wchar_t*)aUpdaterPath.getStr(), 8, pArgs);
+#endif
+    }
+    else
+    {
+        SAL_WARN("desktop.updater", "Updater executable path: " << aUpdaterPath);
+        for (size_t i = 0; i < 8 + rtl_getAppCommandArgCount(); ++i)
+        {
+            SAL_WARN("desktop.updater", pArgs[i]);
+        }
+        bSuccess = false;
+    }
+
+    for (size_t i = 0; i < 8 + rtl_getAppCommandArgCount(); ++i)
+    {
+        delete[] pArgs[i];
+    }
+    delete[] pArgs;
+
+    return bSuccess;
+}
+
+namespace {
+
+// Callback to get the response data from server.
+size_t WriteCallback(void *ptr, size_t size,
+                            size_t nmemb, void *userp)
+{
+  if (!userp)
+    return 0;
+
+  std::string* response = static_cast<std::string *>(userp);
+  size_t real_size = size * nmemb;
+  response->append(static_cast<char *>(ptr), real_size);
+  return real_size;
+}
+
+
+
+class invalid_update_info : public std::exception
+{
+};
+
+class invalid_hash : public std::exception
+{
+    OString maMessage;
+public:
+
+    invalid_hash(const OUString& rExpectedHash, const OUString& rReceivedHash)
+      : maMessage(
+          OUStringToOString(
+            OUString("Invalid hash found.\nExpected: " + rExpectedHash + ";\nReceived: " + rReceivedHash),
+            RTL_TEXTENCODING_UTF8)
+         )
+    {
+    }
+
+    const char* what() const noexcept override
+    {
+        return maMessage.getStr();
+    }
+};
+
+class invalid_size : public std::exception
+{
+    OString maMessage;
+public:
+
+    invalid_size(const size_t nExpectedSize, const size_t nReceivedSize)
+      : maMessage(
+          OUStringToOString(
+            OUString("Invalid file size found.\nExpected: " + OUString::number(nExpectedSize) + ";\nReceived: " + OUString::number(nReceivedSize)),
+            RTL_TEXTENCODING_UTF8)
+         )
+    {
+    }
+
+    const char* what() const noexcept override
+    {
+        return maMessage.getStr();
+    }
+};
+
+OUString toOUString(const std::string& rStr)
+{
+    return OUString::fromUtf8(rStr.c_str());
+}
+
+update_file parse_update_file(orcus::json::node& rNode)
+{
+    if (rNode.type() != orcus::json::node_t::object)
+    {
+        SAL_WARN("desktop.updater", "invalid update or language file entry");
+        throw invalid_update_info();
+    }
+
+    if (rNode.child_count() < 4)
+    {
+        SAL_WARN("desktop.updater", "invalid update or language file entry");
+        throw invalid_update_info();
+    }
+
+    orcus::json::node aURLNode = rNode.child("url");
+    orcus::json::node aHashNode = rNode.child("hash");
+    orcus::json::node aHashTypeNode = rNode.child("hash_function");
+    orcus::json::node aSizeNode = rNode.child("size");
+
+    if (aHashTypeNode.string_value() != "sha512")
+    {
+        SAL_WARN("desktop.updater", "invalid hash type");
+        throw invalid_update_info();
+    }
+
+    update_file aUpdateFile;
+    aUpdateFile.aURL = toOUString(aURLNode.string_value().str());
+
+    if (aUpdateFile.aURL.isEmpty())
+        throw invalid_update_info();
+
+    aUpdateFile.aHash = toOUString(aHashNode.string_value().str());
+    aUpdateFile.nSize = static_cast<sal_uInt32>(aSizeNode.numeric_value());
+    return aUpdateFile;
+}
+
+update_info parse_response(const std::string& rResponse)
+{
+    orcus::json::document_tree aJsonDoc;
+    orcus::json_config aConfig;
+    aJsonDoc.load(rResponse, aConfig);
+
+    auto aDocumentRoot = aJsonDoc.get_document_root();
+    if (aDocumentRoot.type() != orcus::json::node_t::object)
+    {
+        SAL_WARN("desktop.updater", "invalid root entries: " << rResponse);
+        throw invalid_update_info();
+    }
+
+    auto aRootKeys = aDocumentRoot.keys();
+    if (std::find(aRootKeys.begin(), aRootKeys.end(), "error") != aRootKeys.end())
+    {
+        throw invalid_update_info();
+    }
+    else if (std::find(aRootKeys.begin(), aRootKeys.end(), "response") != aRootKeys.end())
+    {
+        update_info aUpdateInfo;
+        auto aMsgNode = aDocumentRoot.child("response");
+        aUpdateInfo.aMessage = toOUString(aMsgNode.string_value().str());
+        return aUpdateInfo;
+    }
+
+    orcus::json::node aFromNode = aDocumentRoot.child("from");
+    if (aFromNode.type() != orcus::json::node_t::string)
+    {
+        throw invalid_update_info();
+    }
+
+    orcus::json::node aSeeAlsoNode = aDocumentRoot.child("see also");
+    if (aSeeAlsoNode.type() != orcus::json::node_t::string)
+    {
+        throw invalid_update_info();
+    }
+
+    orcus::json::node aUpdateNode = aDocumentRoot.child("update");
+    if (aUpdateNode.type() != orcus::json::node_t::object)
+    {
+        throw invalid_update_info();
+    }
+
+    orcus::json::node aLanguageNode = aDocumentRoot.child("languages");
+    if (aUpdateNode.type() != orcus::json::node_t::object)
+    {
+        throw invalid_update_info();
+    }
+
+    update_info aUpdateInfo;
+    aUpdateInfo.aFromBuildID = toOUString(aFromNode.string_value().str());
+    aUpdateInfo.aSeeAlsoURL = toOUString(aSeeAlsoNode.string_value().str());
+
+    aUpdateInfo.aUpdateFile = parse_update_file(aUpdateNode);
+
+    std::vector<orcus::pstring> aLanguages = aLanguageNode.keys();
+    for (auto const& language : aLanguages)
+    {
+        language_file aLanguageFile;
+        auto aLangEntry = aLanguageNode.child(language);
+        aLanguageFile.aLangCode = toOUString(language.str());
+        aLanguageFile.aUpdateFile = parse_update_file(aLangEntry);
+        aUpdateInfo.aLanguageFiles.push_back(aLanguageFile);
+    }
+
+    return aUpdateInfo;
+}
+
+struct WriteDataFile
+{
+    comphelper::Hash maHash;
+    SvStream* mpStream;
+
+    WriteDataFile(SvStream* pStream):
+        maHash(comphelper::HashType::SHA512),
+        mpStream(pStream)
+    {
+    }
+
+    OUString getHash()
+    {
+        auto final_hash = maHash.finalize();
+        std::stringstream aStrm;
+        for (auto& i: final_hash)
+        {
+            aStrm << std::setw(2) << std::setfill('0') << std::hex << (int)i;
+        }
+
+        return toOUString(aStrm.str());
+    }
+};
+
+// Callback to get the response data from server to a file.
+size_t WriteCallbackFile(void *ptr, size_t size,
+                            size_t nmemb, void *userp)
+{
+  if (!userp)
+    return 0;
+
+  WriteDataFile* response = static_cast<WriteDataFile *>(userp);
+  size_t real_size = size * nmemb;
+  response->mpStream->WriteBytes(ptr, real_size);
+  response->maHash.update(static_cast<const unsigned char*>(ptr), real_size);
+  return real_size;
+}
+
+std::string download_content(const OString& rURL, bool bFile, OUString& rHash)
+{
+    Updater::log("Download: " + rURL);
+    std::unique_ptr<CURL, std::function<void(CURL *)>> curl(
+        curl_easy_init(), [](CURL * p) { curl_easy_cleanup(p); });
+
+    if (!curl)
+        return std::string();
+
+    curl_easy_setopt(curl.get(), CURLOPT_URL, rURL.getStr());
+    curl_easy_setopt(curl.get(), CURLOPT_USERAGENT, kUserAgent);
+    bool bUseProxy = false;
+    if (bUseProxy)
+    {
+        /*
+        curl_easy_setopt(curl, CURLOPT_PROXY, proxy.c_str());
+        curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, proxy_user_pwd.c_str());
+        */
+    }
+
+    char buf[] = "Expect:";
+    curl_slist* headerlist = nullptr;
+    headerlist = curl_slist_append(headerlist, buf);
+    curl_easy_setopt(curl.get(), CURLOPT_HTTPHEADER, headerlist);
+    curl_easy_setopt(curl.get(), CURLOPT_FOLLOWLOCATION, 1); // follow redirects
+    // only allow redirect to https://
+#if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 85)
+    curl_easy_setopt(curl.get(), CURLOPT_REDIR_PROTOCOLS_STR, "https");
+#else
+    curl_easy_setopt(curl.get(), CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS);
+#endif
+
+    std::string response_body;
+    utl::TempFile aTempFile;
+    WriteDataFile aFile(aTempFile.GetStream(StreamMode::WRITE));
+    if (!bFile)
+    {
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, WriteCallback);
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA,
+                static_cast<void *>(&response_body));
+
+        aTempFile.EnableKillingFile(true);
+    }
+    else
+    {
+        OUString aTempFileURL = aTempFile.GetURL();
+        OString aTempFileURLOString = OUStringToOString(aTempFileURL, RTL_TEXTENCODING_UTF8);
+        response_body.append(aTempFileURLOString.getStr(), aTempFileURLOString.getLength());
+
+        aTempFile.EnableKillingFile(false);
+
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, WriteCallbackFile);
+        curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA,
+                static_cast<void *>(&aFile));
+    }
+
+    // Fail if 400+ is returned from the web server.
+    curl_easy_setopt(curl.get(), CURLOPT_FAILONERROR, 1);
+
+    CURLcode cc = curl_easy_perform(curl.get());
+    long http_code = 0;
+    curl_easy_getinfo(curl.get(), CURLINFO_RESPONSE_CODE, &http_code);
+    if (http_code != 200)
+    {
+        SAL_WARN("desktop.updater", "download did not succeed. Error code: " << http_code);
+        throw error_updater("download did not succeed");
+    }
+
+    if (cc != CURLE_OK)
+    {
+        SAL_WARN("desktop.updater", "curl error: " << cc);
+        throw error_updater("curl error");
+    }
+
+    if (bFile)
+        rHash = aFile.getHash();
+
+    return response_body;
+}
+
+void handle_file_error(osl::FileBase::RC eError, const OUString& rMsg)
+{
+    switch (eError)
+    {
+        case osl::FileBase::E_None:
+        break;
+        default:
+            SAL_WARN("desktop.updater", "file error code: " << eError << ", " << rMsg);
+            throw error_updater(OUStringToOString(rMsg, RTL_TEXTENCODING_UTF8));
+    }
+}
+
+void download_file(const OUString& rURL, size_t nFileSize, const OUString& rHash, const OUString& aFileName)
+{
+    Updater::log("Download File: " + rURL + "; FileName: " + aFileName);
+    OString aURL = OUStringToOString(rURL, RTL_TEXTENCODING_UTF8);
+    OUString aHash;
+    std::string temp_file = download_content(aURL, true, aHash);
+    if (temp_file.empty())
+        throw error_updater("empty temp file string");
+
+    OUString aTempFile = OUString::fromUtf8(temp_file.c_str());
+    Updater::log("TempFile: " + aTempFile);
+    osl::File aDownloadedFile(aTempFile);
+    osl::FileBase::RC eError = aDownloadedFile.open(1);
+    handle_file_error(eError, "Could not open the download file: " + aTempFile);
+
+    sal_uInt64 nSize = 0;
+    eError = aDownloadedFile.getSize(nSize);
+    handle_file_error(eError, "Could not get the file size of the downloaded file: " + aTempFile);
+    if (nSize != nFileSize)
+    {
+        SAL_WARN("desktop.updater", "File sizes don't match. File might be corrupted.");
+        throw invalid_size(nFileSize, nSize);
+    }
+
+    if (aHash != rHash)
+    {
+        SAL_WARN("desktop.updater", "File hash don't match. File might be corrupted.");
+        throw invalid_hash(rHash, aHash);
+    }
+
+    OUString aPatchDirURL("${$BRAND_BASE_DIR/" LIBO_ETC_FOLDER "/" SAL_CONFIGFILE("bootstrap") ":UserInstallation}/patch/");
+    rtl::Bootstrap::expandMacros(aPatchDirURL);
+    osl::Directory::create(aPatchDirURL);
+
+    OUString aDestFile = aPatchDirURL + aFileName;
+    Updater::log("Destination File: " + aDestFile);
+    aDownloadedFile.close();
+    eError = osl::File::move(aTempFile, aDestFile);
+    handle_file_error(eError, "Could not move the file from the Temp directory to the user config: TempFile: " + aTempFile + "; DestFile: " + aDestFile);
+}
+
+}
+
+void update_checker()
+{
+    OUString aBrandBaseDir("${BRAND_BASE_DIR}");
+    rtl::Bootstrap::expandMacros(aBrandBaseDir);
+    bool bUserWritable = isUserWritable(aBrandBaseDir);
+    if (!bUserWritable)
+    {
+        Updater::log("Can't update as the update location is not user writable");
+        return;
+    }
+
+    OUString aDownloadCheckBaseURL = officecfg::Office::Update::Update::URL::get();
+    static const char* pDownloadCheckBaseURLEnv = std::getenv("LIBO_UPDATER_URL");
+    if (pDownloadCheckBaseURLEnv)
+    {
+        aDownloadCheckBaseURL = OUString::createFromAscii(pDownloadCheckBaseURLEnv);
+    }
+
+    OUString aProductName = utl::ConfigManager::getProductName();
+    OUString aBuildID = Updater::getBuildID();
+
+    static const char* pBuildIdEnv = std::getenv("LIBO_UPDATER_BUILD");
+    if (pBuildIdEnv)
+    {
+        aBuildID = OUString::createFromAscii(pBuildIdEnv);
+    }
+
+    OUString aBuildTarget = "${_OS}_${_ARCH}";
+    rtl::Bootstrap::expandMacros(aBuildTarget);
+    OUString aChannel = Updater::getUpdateChannel();
+    static const char* pUpdateChannelEnv = std::getenv("LIBO_UPDATER_CHANNEL");
+    if (pUpdateChannelEnv)
+    {
+        aChannel = OUString::createFromAscii(pUpdateChannelEnv);
+    }
+
+    OUString aDownloadCheckURL = aDownloadCheckBaseURL + "update/check/1/" + aProductName +
+        "/" + aBuildID + "/" + aBuildTarget + "/" + aChannel;
+    OString aURL = OUStringToOString(aDownloadCheckURL, RTL_TEXTENCODING_UTF8);
+    Updater::log("Update check: " + aURL);
+
+    try
+    {
+        OUString aHash;
+        std::string response_body = download_content(aURL, false, aHash);
+        if (!response_body.empty())
+        {
+
+            update_info aUpdateInfo = parse_response(response_body);
+            if (aUpdateInfo.aUpdateFile.aURL.isEmpty())
+            {
+                // No update currently available
+                // add entry to updating.log with the message
+                SAL_WARN("desktop.updater", "Message received from the updater: " << aUpdateInfo.aMessage);
+                Updater::log("Server response: " + aUpdateInfo.aMessage);
+            }
+            else
+            {
+                css::uno::Sequence<OUString> aInstalledLanguages(officecfg::Setup::Office::InstalledLocales::get()->getElementNames());
+                std::set<OUString> aInstalledLanguageSet(std::begin(aInstalledLanguages), std::end(aInstalledLanguages));
+                download_file(aUpdateInfo.aUpdateFile.aURL, aUpdateInfo.aUpdateFile.nSize, aUpdateInfo.aUpdateFile.aHash, "update.mar");
+                for (auto& lang_update : aUpdateInfo.aLanguageFiles)
+                {
+                    // only download the language packs for installed languages
+                    if (aInstalledLanguageSet.find(lang_update.aLangCode) != aInstalledLanguageSet.end())
+                    {
+                        OUString aFileName = "update_" + lang_update.aLangCode + ".mar";
+                        download_file(lang_update.aUpdateFile.aURL, lang_update.aUpdateFile.nSize, lang_update.aUpdateFile.aHash, aFileName);
+                    }
+                }
+                OUString aSeeAlsoURL = aUpdateInfo.aSeeAlsoURL;
+                std::shared_ptr< comphelper::ConfigurationChanges > batch(
+                        comphelper::ConfigurationChanges::create());
+                officecfg::Office::Update::Update::SeeAlso::set(aSeeAlsoURL, batch);
+                batch->commit();
+            }
+        }
+    }
+    catch (const invalid_update_info&)
+    {
+        SAL_WARN("desktop.updater", "invalid update information");
+        Updater::log(OString("warning: invalid update info"));
+    }
+    catch (const error_updater& e)
+    {
+        SAL_WARN("desktop.updater", "error during the update check: " << e.what());
+        Updater::log(OString("warning: error by the updater") + e.what());
+    }
+    catch (const invalid_size& e)
+    {
+        SAL_WARN("desktop.updater", e.what());
+        Updater::log(OString("warning: invalid size"));
+    }
+    catch (const invalid_hash& e)
+    {
+        SAL_WARN("desktop.updater", e.what());
+        Updater::log(OString("warning: invalid hash"));
+    }
+    catch (...)
+    {
+        SAL_WARN("desktop.updater", "unknown error during the update check");
+        Updater::log(OString("warning: unknown exception"));
+    }
+}
+
+OUString Updater::getUpdateInfoLog()
+{
+    OUString aUpdateInfoURL("${$BRAND_BASE_DIR/" LIBO_ETC_FOLDER "/" SAL_CONFIGFILE("bootstrap") ":UserInstallation}/patch/updating.log");
+    rtl::Bootstrap::expandMacros(aUpdateInfoURL);
+
+    return aUpdateInfoURL;
+}
+
+OUString Updater::getPatchDirURL()
+{
+    OUString aPatchDirURL("${$BRAND_BASE_DIR/" LIBO_ETC_FOLDER "/" SAL_CONFIGFILE("bootstrap") ":UserInstallation}/patch/");
+    rtl::Bootstrap::expandMacros(aPatchDirURL);
+
+    return aPatchDirURL;
+}
+
+OUString Updater::getUpdateFileURL()
+{
+    return getPatchDirURL() + "update.mar";
+}
+
+OUString Updater::getInstallationPath()
+{
+    OUString aInstallDir( "$BRAND_BASE_DIR/");
+    rtl::Bootstrap::expandMacros(aInstallDir);
+
+    return getPathFromURL(aInstallDir);
+}
+
+OUString Updater::getExecutableDirURL()
+{
+    OUString aExeDir( "$BRAND_BASE_DIR/" LIBO_BIN_FOLDER "/" );
+    rtl::Bootstrap::expandMacros(aExeDir);
+
+    return aExeDir;
+}
+
+void Updater::log(const OUString& rMessage)
+{
+    SAL_INFO("desktop.updater", rMessage);
+    OUString aUpdateLog = getUpdateInfoLog();
+    SvFileStream aLog(aUpdateLog, StreamMode::STD_READWRITE);
+    aLog.Seek(aLog.Tell() + aLog.remainingSize()); // make sure we are at the end
+    aLog.WriteLine(OUStringToOString(rMessage, RTL_TEXTENCODING_UTF8));
+}
+
+void Updater::log(const OString& rMessage)
+{
+    SAL_INFO("desktop.updater", rMessage);
+    OUString aUpdateLog = getUpdateInfoLog();
+    SvFileStream aLog(aUpdateLog, StreamMode::STD_READWRITE);
+    aLog.Seek(aLog.Tell() + aLog.remainingSize()); // make sure we are at the end
+    aLog.WriteLine(rMessage);
+}
+
+void Updater::log(const char* pMessage)
+{
+    SAL_INFO("desktop.updater", pMessage);
+    OUString aUpdateLog = getUpdateInfoLog();
+    SvFileStream aLog(aUpdateLog, StreamMode::STD_READWRITE);
+    aLog.Seek(aLog.Tell() + aLog.remainingSize()); // make sure we are at the end
+    aLog.WriteCharPtr(pMessage);
+}
+
+OUString Updater::getBuildID()
+{
+    OUString aBuildID("${$BRAND_BASE_DIR/" LIBO_ETC_FOLDER "/" SAL_CONFIGFILE("version") ":buildid}");
+    rtl::Bootstrap::expandMacros(aBuildID);
+
+    return aBuildID;
+}
+
+OUString Updater::getUpdateChannel()
+{
+    OUString aUpdateChannel("${$BRAND_BASE_DIR/" LIBO_ETC_FOLDER "/" SAL_CONFIGFILE("version") ":UpdateChannel}");
+    rtl::Bootstrap::expandMacros(aUpdateChannel);
+
+    return aUpdateChannel;
+}
+
+void Updater::removeUpdateFiles()
+{
+    Updater::log("Removing: " + getUpdateFileURL());
+    osl::File::remove(getUpdateFileURL());
+
+    OUString aPatchDirURL = getPatchDirURL();
+    osl::Directory aDir(aPatchDirURL);
+    aDir.open();
+
+    osl::FileBase::RC eRC;
+    do
+    {
+        osl::DirectoryItem aItem;
+        eRC = aDir.getNextItem(aItem);
+        if (eRC == osl::FileBase::E_None)
+        {
+            osl::FileStatus aStatus(osl_FileStatus_Mask_All);
+            if (aItem.getFileStatus(aStatus) != osl::FileBase::E_None)
+                continue;
+
+            if (!aStatus.isRegular())
+                continue;
+
+            OUString aURL = aStatus.getFileURL();
+            if (!aURL.endsWith(".mar"))
+                continue;
+
+            Updater::log("Removing. " + aURL);
+            osl::File::remove(aURL);
+        }
+    }
+    while (eRC == osl::FileBase::E_None);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */