blob: 28b6122c43c7259214b627eae62d0208c3760f26 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "notification_helper/notification_activator.h"
#include <shellapi.h>
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "base/strings/string16.h"
#include "base/win/windows_types.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_switches.h"
#include "notification_helper/trace_util.h"
namespace {
// Returns the file path of chrome.exe if found, or an empty file path if not.
base::FilePath GetChromeExePath() {
// Look for chrome.exe one folder above notification_helper.exe (as expected
// in Chrome installs). Failing that, look for it alonside
// notification_helper.exe.
base::FilePath dir_exe;
if (!PathService::Get(base::DIR_EXE, &dir_exe))
return base::FilePath();
base::FilePath chrome_exe =
if (!base::PathExists(chrome_exe)) {
chrome_exe = dir_exe.Append(chrome::kBrowserProcessExecutableName);
if (!base::PathExists(chrome_exe))
return base::FilePath();
return chrome_exe;
} // namespace
namespace notification_helper {
NotificationActivator::~NotificationActivator() = default;
// Handles toast activation outside of the browser process lifecycle by
// launching chrome.exe with --notification-launch-id. This new process may
// rendezvous to an existing browser process or become a new one, as
// appropriate.
// When this method is called, there are three possibilities depending on the
// running state of Chrome.
// 1) NOT_RUNNING: Chrome is not running.
// 2) NEW_INSTANCE: Chrome is running, but it's NOT the same instance that sent
// the toast.
// 3) SAME_INSTANCE : Chrome is running, and it _is_ the same instance that sent
// the toast.
// Chrome could attach an activation event handler to the toast so that Windows
// can call it directly to handle the activation. However, Windows makes this
// function call only in case SAME_INSTANCE. For the other two cases, Chrome
// needs to handle the activation on its own. Since there is no way to
// differentiate cases SAME_INSTANCE and NEW_INSTANCE in this
// notification_helper process, Chrome doesn't attach an activation event
// handler to the toast and handles all three cases through the command line.
HRESULT NotificationActivator::Activate(
LPCWSTR app_user_model_id,
LPCWSTR invoked_args,
ULONG count) {
base::FilePath chrome_exe_path = GetChromeExePath();
if (chrome_exe_path.empty()) {
Trace(L"Failed to get chrome exe path\n");
// |invoked_args| contains the launch ID string encoded by Chrome. Chrome adds
// it to the launch argument of the toast and gets it back via |invoked_args|
// here. Chrome needs the data to be able to look up the notification on its
// end.
base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
base::string16 params(command_line.GetCommandLineString());
memset(&info, 0, sizeof(info));
info.cbSize = sizeof(info);
info.lpFile = chrome_exe_path.value().c_str();
info.lpParameters = params.c_str();
info.nShow = SW_SHOWNORMAL;
if (!::ShellExecuteEx(&info)) {
DWORD error_code = ::GetLastError();
Trace(L"Unable to launch Chrome.exe; error: 0x%08X\n", error_code);
return HRESULT_FROM_WIN32(error_code);
return S_OK;
} // namespace notification_helper