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/*
* SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2015 ownCloud GmbH
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "NCContextMenuRegHandler.h"
#include "RegDelnode.h"
#include <strsafe.h>
#include <objbase.h>
namespace {
HRESULT SetHKCRRegistryKeyAndValue(PCWSTR pszSubKey, PCWSTR pszValueName, PCWSTR pszData)
{
HRESULT hr = 0;
HKEY hKey = nullptr;
// Creates the specified registry key. If the key already exists, the
// function opens it.
hr = HRESULT_FROM_WIN32(RegCreateKeyEx(HKEY_CLASSES_ROOT, pszSubKey, 0,
nullptr, REG_OPTION_NON_VOLATILE, KEY_WRITE, nullptr, &hKey, nullptr));
if (SUCCEEDED(hr))
{
DWORD cbData = 0;
const BYTE * lpData = nullptr;
if (pszData)
{
// Set the specified value of the key.
cbData = lstrlen(pszData) * sizeof(*pszData);
lpData = reinterpret_cast<const BYTE *>(pszData);
}
else
{
cbData = 0;
lpData = nullptr;
}
hr = HRESULT_FROM_WIN32(RegSetValueEx(hKey, pszValueName, 0,
REG_SZ, lpData, cbData));
RegCloseKey(hKey);
}
return hr;
}
HRESULT GetHKCRRegistryKeyAndValue(PCWSTR pszSubKey, PCWSTR pszValueName, PWSTR pszData, DWORD cbData)
{
HRESULT hr = 0;
HKEY hKey = nullptr;
// Try to open the specified registry key.
hr = HRESULT_FROM_WIN32(RegOpenKeyEx(HKEY_CLASSES_ROOT, pszSubKey, 0,
KEY_READ, &hKey));
if (SUCCEEDED(hr))
{
// Get the data for the specified value name.
hr = HRESULT_FROM_WIN32(RegQueryValueEx(hKey, pszValueName, nullptr,
nullptr, reinterpret_cast<LPBYTE>(pszData), &cbData));
RegCloseKey(hKey);
}
return hr;
}
}
HRESULT NCContextMenuRegHandler::RegisterInprocServer(PCWSTR pszModule, const CLSID& clsid, PCWSTR pszFriendlyName, PCWSTR pszThreadModel)
{
if (!pszModule || !pszThreadModel)
{
return E_INVALIDARG;
}
HRESULT hr = 0;
wchar_t szCLSID[MAX_PATH];
StringFromGUID2(clsid, szCLSID, ARRAYSIZE(szCLSID));
wchar_t szSubkey[MAX_PATH];
// Create the HKCR\CLSID\{<CLSID>} key.
hr = StringCchPrintf(szSubkey, ARRAYSIZE(szSubkey), LR"(CLSID\%s)", szCLSID);
if (SUCCEEDED(hr))
{
hr = SetHKCRRegistryKeyAndValue(szSubkey, nullptr, pszFriendlyName);
// Create the HKCR\CLSID\{<CLSID>}\ContextMenuOptIn subkey.
if (SUCCEEDED(hr)) {
hr = SetHKCRRegistryKeyAndValue(szSubkey, L"ContextMenuOptIn", nullptr);
}
// Create the HKCR\CLSID\{<CLSID>}\InprocServer32 key.
if (SUCCEEDED(hr))
{
hr = StringCchPrintf(szSubkey, ARRAYSIZE(szSubkey),
LR"(CLSID\%s\InprocServer32)", szCLSID);
if (SUCCEEDED(hr))
{
// Set the default value of the InprocServer32 key to the
// path of the COM module.
hr = SetHKCRRegistryKeyAndValue(szSubkey, nullptr, pszModule);
if (SUCCEEDED(hr))
{
// Set the threading model of the component.
hr = SetHKCRRegistryKeyAndValue(szSubkey,
L"ThreadingModel", pszThreadModel);
}
}
}
}
return hr;
}
HRESULT NCContextMenuRegHandler::UnregisterInprocServer(const CLSID& clsid)
{
HRESULT hr = S_OK;
wchar_t szCLSID[MAX_PATH];
StringFromGUID2(clsid, szCLSID, ARRAYSIZE(szCLSID));
wchar_t szSubkey[MAX_PATH];
// Delete the HKCR\CLSID\{<CLSID>} key.
hr = StringCchPrintf(szSubkey, ARRAYSIZE(szSubkey), LR"(CLSID\%s)", szCLSID);
if (SUCCEEDED(hr))
{
hr = HRESULT_FROM_WIN32(RegDelnode(HKEY_CLASSES_ROOT, szSubkey));
}
return hr;
}
HRESULT NCContextMenuRegHandler::RegisterShellExtContextMenuHandler(
PCWSTR pszFileType, const CLSID& clsid, PCWSTR pszFriendlyName)
{
if (!pszFileType)
{
return E_INVALIDARG;
}
HRESULT hr = 0;
wchar_t szCLSID[MAX_PATH];
StringFromGUID2(clsid, szCLSID, ARRAYSIZE(szCLSID));
wchar_t szSubkey[MAX_PATH];
// If pszFileType starts with '.', try to read the default value of the
// HKCR\<File Type> key which contains the ProgID to which the file type
// is linked.
if (*pszFileType == L'.')
{
wchar_t szDefaultVal[260];
hr = GetHKCRRegistryKeyAndValue(pszFileType, nullptr, szDefaultVal,
sizeof(szDefaultVal));
// If the key exists and its default value is not empty, use the
// ProgID as the file type.
if (SUCCEEDED(hr) && szDefaultVal[0] != L'\0')
{
pszFileType = szDefaultVal;
}
}
// Create the key HKCR\<File Type>\shellex\ContextMenuHandlers\{friendlyName>}
hr = StringCchPrintf(szSubkey, ARRAYSIZE(szSubkey),
LR"(%s\shellex\ContextMenuHandlers\%s)", pszFileType, pszFriendlyName);
if (SUCCEEDED(hr))
{
// Set the default value of the key.
hr = SetHKCRRegistryKeyAndValue(szSubkey, nullptr, szCLSID);
}
return hr;
}
HRESULT NCContextMenuRegHandler::UnregisterShellExtContextMenuHandler(
PCWSTR pszFileType, PCWSTR pszFriendlyName)
{
if (!pszFileType)
{
return E_INVALIDARG;
}
HRESULT hr = 0;
wchar_t szSubkey[MAX_PATH];
// If pszFileType starts with '.', try to read the default value of the
// HKCR\<File Type> key which contains the ProgID to which the file type
// is linked.
if (*pszFileType == L'.')
{
wchar_t szDefaultVal[260];
hr = GetHKCRRegistryKeyAndValue(pszFileType, nullptr, szDefaultVal,
sizeof(szDefaultVal));
// If the key exists and its default value is not empty, use the
// ProgID as the file type.
if (SUCCEEDED(hr) && szDefaultVal[0] != L'\0')
{
pszFileType = szDefaultVal;
}
}
// Remove the HKCR\<File Type>\shellex\ContextMenuHandlers\{friendlyName} key.
hr = StringCchPrintf(szSubkey, ARRAYSIZE(szSubkey),
LR"(%s\shellex\ContextMenuHandlers\%s)", pszFileType, pszFriendlyName);
if (SUCCEEDED(hr))
{
hr = HRESULT_FROM_WIN32(RegDelnode(HKEY_CLASSES_ROOT, szSubkey));
}
return hr;
}
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