nextcloud-desktop/shell_integration/windows/NCOverlays/NCOverlay.cpp

/**
 * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

#include "NCOverlay.h"
#include "NCOverlayFactory.h"
#include "StringUtil.h"
#include "RemotePathChecker.h"

#include <algorithm>
#include <iostream>
#include <fstream>
#include <memory>

using namespace std;

#pragma comment(lib, "shlwapi.lib")

extern HINSTANCE instanceHandle;

#define IDM_DISPLAY 0  
#define IDB_OK 101

namespace {

unique_ptr<RemotePathChecker> s_instance;

RemotePathChecker *getGlobalChecker()
{
    // On Vista we'll run into issue #2680 if we try to create the thread+pipe connection
    // on any DllGetClassObject of our registered classes.
    // Work around the issue by creating the static RemotePathChecker only once actually needed.
    static once_flag s_onceFlag;
    call_once(s_onceFlag, [] { s_instance.reset(new RemotePathChecker); });

    return s_instance.get();
}

}
NCOverlay::NCOverlay(int state) 
    : _referenceCount(1)
    , _state(state)
{
}

NCOverlay::~NCOverlay(void)
{
}


IFACEMETHODIMP_(ULONG) NCOverlay::AddRef()
{
    return InterlockedIncrement(&_referenceCount);
}

IFACEMETHODIMP NCOverlay::QueryInterface(REFIID riid, void **ppv)
{
    HRESULT hr = S_OK;

    if (IsEqualIID(IID_IUnknown, riid) ||  IsEqualIID(IID_IShellIconOverlayIdentifier, riid))
    {
        *ppv = static_cast<IShellIconOverlayIdentifier *>(this);
    }
    else
    {
        hr = E_NOINTERFACE;
        *ppv = nullptr;
    }

    if (*ppv)
    {
        AddRef();
    }

    return hr;
}

IFACEMETHODIMP_(ULONG) NCOverlay::Release()
{
    ULONG cRef = InterlockedDecrement(&_referenceCount);
    if (0 == cRef)
    {
        delete this;
    }

    return cRef;
}

IFACEMETHODIMP NCOverlay::GetPriority(int *pPriority)
{
    // this defines which handler has prededence, so
    // we order this in terms of likelyhood
    switch (_state) {
    case State_OK:
        *pPriority = 0; break;
    case State_OKShared:
        *pPriority = 1; break;
    case State_Warning:
        *pPriority = 2; break;
    case State_Sync:
        *pPriority = 3; break;
    case State_Error:
        *pPriority = 4; break;
    default:
        *pPriority = 5; break;
    }

    return S_OK;
}

IFACEMETHODIMP NCOverlay::IsMemberOf(PCWSTR pwszPath, DWORD dwAttrib)
{
    RemotePathChecker* checker = getGlobalChecker();
    std::shared_ptr<const std::vector<std::wstring>> watchedDirectories = checker->WatchedDirectories();

    if (watchedDirectories->empty()) {
        return MAKE_HRESULT(S_FALSE, 0, 0);
    }

    bool watched = false;
    size_t pathLength = wcslen(pwszPath);
    for (auto it = watchedDirectories->begin(); it != watchedDirectories->end(); ++it) {
        if (StringUtil::isDescendantOf(pwszPath, pathLength, *it)) {
            watched = true;
        }
    }

    if (!watched) {
        return MAKE_HRESULT(S_FALSE, 0, 0);
    }

    int state = 0;
    if (!checker->IsMonitoredPath(pwszPath, &state)) {
        return MAKE_HRESULT(S_FALSE, 0, 0);
    }
    return MAKE_HRESULT(state == _state ? S_OK : S_FALSE, 0, 0);
}

IFACEMETHODIMP NCOverlay::GetOverlayInfo(PWSTR pwszIconFile, int cchMax, int *pIndex, DWORD *pdwFlags)
{
    *pIndex = 0;
    *pdwFlags = ISIOI_ICONFILE | ISIOI_ICONINDEX;
    *pIndex = _state;

    if (GetModuleFileName(instanceHandle, pwszIconFile, cchMax) == 0) {
        HRESULT hResult = HRESULT_FROM_WIN32(GetLastError());
        wcerr << L"IsOK? " << (hResult == S_OK) << L" with path " << pwszIconFile << L", index " << *pIndex << endl;
        return hResult;
    }

    return S_OK;
}