PowerToys/src/modules/poweraccent/PowerAccentModuleInterface/dllmain.cpp

#include "pch.h"
#include <interface/powertoy_module_interface.h>
#include <common/SettingsAPI/settings_objects.h>
#include <common/interop/shared_constants.h>
#include "trace.h"
#include "resource.h"
#include "PowerAccentConstants.h"
#include <common/logger/logger.h>
#include <common/SettingsAPI/settings_helpers.h>

#include <common/utils/elevation.h>
#include <common/utils/process_path.h>
#include <common/utils/resources.h>
#include <common/utils/os-detect.h>
#include <common/utils/logger_helper.h>
#include <common/utils/winapi_error.h>

#include <filesystem>
#include <set>

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
        Trace::RegisterProvider();
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
        break;
    case DLL_PROCESS_DETACH:
        Trace::UnregisterProvider();
        break;
    }
    return TRUE;
}

const static wchar_t* MODULE_NAME = L"QuickAccent";
const static wchar_t* MODULE_DESC = L"A module that keeps your computer QuickAccent on-demand.";

class PowerAccent : public PowertoyModuleIface
{
    std::wstring app_name;
    std::wstring app_key;

private:
    bool m_enabled = false;
    HANDLE m_hInvokeEvent;
    PROCESS_INFORMATION p_info;

    bool is_process_running()
    {
        return WaitForSingleObject(p_info.hProcess, 0) == WAIT_TIMEOUT;
    }

    void launch_process()
    {
        Logger::trace(L"Launching PowerToys QuickAccent process");
        unsigned long powertoys_pid = GetCurrentProcessId();

        std::wstring executable_args = L"" + std::to_wstring(powertoys_pid);
        std::wstring application_path = L"modules\\PowerAccent\\PowerToys.PowerAccent.exe";
        std::wstring full_command_path = application_path + L" " + executable_args.data();
        Logger::trace(L"PowerToys QuickAccent launching: " + full_command_path);

        STARTUPINFO info = { sizeof(info) };

        if (!CreateProcess(application_path.c_str(), full_command_path.data(), NULL, NULL, true, NULL, NULL, NULL, &info, &p_info))
        {
            DWORD error = GetLastError();
            std::wstring message = L"PowerToys QuickAccent failed to start with error: ";
            message += std::to_wstring(error);
            Logger::error(message);
        }
    }

public:
    PowerAccent()
    {
        app_name = MODULE_NAME;
        app_key = PowerAccentConstants::ModuleKey;
        LoggerHelpers::init_logger(app_key, L"ModuleInterface", "QuickAccent");
        Logger::info("Launcher object is constructing");
    };

    virtual void destroy() override
    {
        delete this;
    }

    virtual const wchar_t* get_name() override
    {
        return MODULE_NAME;
    }

    virtual bool get_config(wchar_t* buffer, int* buffer_size) override
    {
        HINSTANCE hinstance = reinterpret_cast<HINSTANCE>(&__ImageBase);

        PowerToysSettings::Settings settings(hinstance, get_name());
        settings.set_description(MODULE_DESC);

        return settings.serialize_to_buffer(buffer, buffer_size);
    }

    virtual const wchar_t* get_key() override
    {
        return app_key.c_str();
    }

    virtual void set_config(const wchar_t* config) override
    {
        try
        {
            // Parse the input JSON string.
            PowerToysSettings::PowerToyValues values =
                PowerToysSettings::PowerToyValues::from_json_string(config, get_key());

            // If you don't need to do any custom processing of the settings, proceed
            // to persists the values.
            values.save_to_settings_file();
        }
        catch (std::exception&)
        {
            // Improper JSON.
        }
    }

    virtual void enable()
    {
        ResetEvent(m_hInvokeEvent);
        launch_process();
        m_enabled = true;
        Trace::EnablePowerAccent(true);
    };

    virtual void disable()
    {
        if (m_enabled)
        {
            Logger::trace(L"Disabling QuickAccent... {}", m_enabled);
            ResetEvent(m_hInvokeEvent);

            auto exitEvent = CreateEvent(nullptr, false, false, CommonSharedConstants::POWERACCENT_EXIT_EVENT);
            if (!exitEvent)
            {
                Logger::warn(L"Failed to create exit event for PowerToys QuickAccent. {}", get_last_error_or_default(GetLastError()));
            }
            else
            {
                Logger::trace(L"Signaled exit event for PowerToys QuickAccent.");
                if (!SetEvent(exitEvent))
                {
                    Logger::warn(L"Failed to signal exit event for PowerToys QuickAccent. {}", get_last_error_or_default(GetLastError()));

                    // For some reason, we couldn't process the signal correctly, so we still
                    // need to terminate the PowerAccent process.
                    TerminateProcess(p_info.hProcess, 1);
                }

                ResetEvent(exitEvent);
                CloseHandle(exitEvent);
                CloseHandle(p_info.hProcess);
            }
        }

        m_enabled = false;
        Trace::EnablePowerAccent(false);
    }

    virtual bool is_enabled() override
    {
        return m_enabled;
    }

    // Returns whether the PowerToys should be enabled by default
    virtual bool is_enabled_by_default() const override
    {
        return false;
    }
};

extern "C" __declspec(dllexport) PowertoyModuleIface* __cdecl powertoy_create()
{
    return new PowerAccent();
}