146 lines
7.5 KiB
C++
146 lines
7.5 KiB
C++
#include "screenshot_notifications.h"
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#include <atomic>
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#include <shlobj.h>
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#include <propkey.h>
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#include <propvarutil.h>
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#include <wrl/client.h>
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namespace ks {
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namespace {
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constexpr wchar_t AppId[]=L"HrynCo.KSwitcher.Screenshot";
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constexpr GUID ActivatorId{0xe3f78047,0xf0ad,0x49b6,{0x90,0x74,0x41,0x19,0x31,0x70,0x61,0x67}};
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}
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namespace {
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using Microsoft::WRL::ComPtr;
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void check(HRESULT result) {
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if(FAILED(result)) throw std::runtime_error("Screenshot registration failed: " + std::to_string((unsigned long)result));
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}
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void registryString(const std::wstring &path,const wchar_t *name,const std::wstring &value)
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{
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HKEY key{};
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if(RegCreateKeyExW(HKEY_CURRENT_USER,path.c_str(),0,nullptr,0,KEY_SET_VALUE,nullptr,&key,nullptr)!=ERROR_SUCCESS)
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throw std::runtime_error("Cannot register screenshot notifications");
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auto result=RegSetValueExW(key,name,0,REG_SZ,(const BYTE *)value.c_str(),DWORD((value.size()+1)*sizeof(wchar_t)));
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RegCloseKey(key);
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if(result!=ERROR_SUCCESS) throw std::runtime_error("Cannot register screenshot notification activation");
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}
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}
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void registerScreenshotNotifications()
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{
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auto exe=(std::filesystem::path(executable()).parent_path()/L"KSwitcher.Screenshot.exe").wstring();
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if(!std::filesystem::exists(exe)) throw std::runtime_error("Screenshot helper is missing");
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registryString(L"Software\\Classes\\CLSID\\{e3f78047-f0ad-49b6-9074-411931706167}\\LocalServer32",nullptr,L"\""+exe+L"\" --toast-activated");
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registryString(L"Software\\Classes\\CLSID\\{e3f78047-f0ad-49b6-9074-411931706167}\\LocalServer32",L"ServerExecutable",exe);
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auto identity=std::wstring(L"Software\\Classes\\AppUserModelId\\")+AppId;
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registryString(identity,L"DisplayName",L"KSwitcher Screenshot");
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registryString(identity,L"IconUri",exe);
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registryString(identity,L"CustomActivator",L"{e3f78047-f0ad-49b6-9074-411931706167}");
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// A shortcut supplies desktop notification identity and its COM activation callback.
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ComPtr<IShellLinkW> link; check(CoCreateInstance(CLSID_ShellLink,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&link)));
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check(link->SetPath(exe.c_str())); check(link->SetIconLocation(exe.c_str(),0));
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ComPtr<IPropertyStore> properties; check(link.As(&properties));
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PROPVARIANT id{}; check(InitPropVariantFromString(AppId,&id));
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auto result=properties->SetValue(PKEY_AppUserModel_ID,id); PropVariantClear(&id); check(result);
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GUID activator=ActivatorId;
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PROPVARIANT clsid{}; clsid.vt=VT_CLSID; clsid.puuid=&activator;
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check(properties->SetValue(PKEY_AppUserModel_ToastActivatorCLSID,clsid));
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check(properties->Commit());
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PWSTR programs{}; check(SHGetKnownFolderPath(FOLDERID_Programs,0,nullptr,&programs));
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auto shortcut=std::filesystem::path(programs)/L"KSwitcher Screenshot.lnk"; CoTaskMemFree(programs);
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ComPtr<IPersistFile> file; check(link.As(&file)); check(file->Save(shortcut.c_str(),TRUE));
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// Notify the shell that notification identity/activation registration changed.
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SHChangeNotify(SHCNE_ASSOCCHANGED,SHCNF_IDLIST,nullptr,nullptr);
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}
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bool validScreenshotToken(const std::wstring &id)
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{
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if(id.size()!=36) return false;
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for(size_t i=0;i<id.size();++i) {
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if(i==8 || i==13 || i==18 || i==23) { if(id[i]!=L'-') return false; }
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else if(!((id[i]>=L'0' && id[i]<=L'9') || (id[i]>=L'a' && id[i]<=L'f') || (id[i]>=L'A' && id[i]<=L'F'))) return false;
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}
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return true;
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}
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namespace {
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// Windows SDK INotificationActivationCallback ABI (notificationactivationcallback.h).
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constexpr GUID CallbackId{0x53e31837,0x6600,0x4a81,{0x93,0x95,0x75,0xcf,0xfe,0x74,0x6f,0x94}};
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struct NotificationInput { LPCWSTR key,value; };
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struct NotificationCallback : IUnknown {
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virtual HRESULT STDMETHODCALLTYPE Activate(LPCWSTR,LPCWSTR,const NotificationInput *,ULONG)=0;
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};
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class Activator final : public NotificationCallback {
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std::atomic<ULONG> references{1};
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DWORD thread=GetCurrentThreadId();
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std::wstring target;
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bool quit;
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public:
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Activator(std::wstring path,bool shouldQuit):target(std::move(path)),quit(shouldQuit) {}
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HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id,void **out) override {
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if(!out) return E_POINTER;
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*out=nullptr;
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if(id!=IID_IUnknown && id!=CallbackId) return E_NOINTERFACE;
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*out=static_cast<NotificationCallback *>(this); AddRef(); return S_OK;
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}
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ULONG STDMETHODCALLTYPE AddRef() override { return ++references; }
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ULONG STDMETHODCALLTYPE Release() override { auto count=--references; if(!count) delete this; return count; }
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HRESULT STDMETHODCALLTYPE Activate(LPCWSTR app,LPCWSTR args,const NotificationInput *,ULONG) override {
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if(!app || std::wstring(app)!=AppId || !args || !validScreenshotToken(args)) return E_INVALIDARG;
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auto path=target; auto command=L"\""+path+L"\" --open \"kswitcher-screenshot:"+args+L"\"";
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STARTUPINFOW startup{sizeof(startup)}; PROCESS_INFORMATION process{};
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auto ok=CreateProcessW(path.c_str(),command.data(),nullptr,nullptr,FALSE,CREATE_SUSPENDED,nullptr,nullptr,&startup,&process);
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auto result=ok?S_OK:HRESULT_FROM_WIN32(GetLastError());
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if(ok) {
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AllowSetForegroundWindow(process.dwProcessId); ResumeThread(process.hThread);
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CloseHandle(process.hThread); CloseHandle(process.hProcess);
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}
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if(quit) PostThreadMessageW(thread,WM_QUIT,0,0);
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return result;
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}
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};
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class ActivatorFactory final : public IClassFactory {
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std::atomic<ULONG> references{1};
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std::wstring target;
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bool quit;
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public:
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ActivatorFactory(std::wstring path,bool shouldQuit):target(std::move(path)),quit(shouldQuit) {}
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HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id,void **out) override {
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if(!out) return E_POINTER;
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*out=nullptr;
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if(id!=IID_IUnknown && id!=IID_IClassFactory) return E_NOINTERFACE;
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*out=static_cast<IClassFactory *>(this); AddRef(); return S_OK;
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}
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ULONG STDMETHODCALLTYPE AddRef() override { return ++references; }
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ULONG STDMETHODCALLTYPE Release() override { auto count=--references; if(!count) delete this; return count; }
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HRESULT STDMETHODCALLTYPE CreateInstance(IUnknown *outer,REFIID id,void **out) override {
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if(outer) return CLASS_E_NOAGGREGATION;
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auto object=new Activator(target,quit); auto result=object->QueryInterface(id,out); object->Release(); return result;
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}
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HRESULT STDMETHODCALLTYPE LockServer(BOOL) override { return S_OK; }
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};
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}
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int runScreenshotToastActivator()
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{
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if(FAILED(CoInitializeEx(nullptr,COINIT_APARTMENTTHREADED))) return 1;
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MSG message{}; PeekMessageW(&message,nullptr,0,0,PM_NOREMOVE);
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auto factory=new ActivatorFactory(executable(),true); DWORD registration{};
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auto result=CoRegisterClassObject(ActivatorId,factory,CLSCTX_LOCAL_SERVER,REGCLS_MULTIPLEUSE,®istration);
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factory->Release();
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if(SUCCEEDED(result)) {
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auto timer=SetTimer(nullptr,0,60000,[](HWND,UINT,UINT_PTR,DWORD){PostQuitMessage(0);});
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while(GetMessageW(&message,nullptr,0,0)>0) { TranslateMessage(&message); DispatchMessageW(&message); }
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if(timer) KillTimer(nullptr,timer);
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CoRevokeClassObject(registration);
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}
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CoUninitialize(); return FAILED(result)?1:0;
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}
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DWORD startScreenshotActivationListener()
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{
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auto target=std::filesystem::path(executable()).parent_path()/L"KSwitcher.Screenshot.exe";
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auto factory=new ActivatorFactory(target.wstring(),false);
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DWORD registration{};
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auto result=CoRegisterClassObject(ActivatorId,factory,CLSCTX_LOCAL_SERVER,REGCLS_MULTIPLEUSE,®istration);
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factory->Release();
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return SUCCEEDED(result)?registration:0;
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}
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}
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