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// Copyright (c) 2012 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.
// AppHostInstaller checks the presence of app_host.exe, and launches
// the installer if missing. The check must be performed on the FILE thread.
// The installation is also launched on the FILE thread as an asynchronous
// process. Once installation completes, QuickEnableWatcher is notified.
// AppHostInstaller::FinishOnCallerThread() is called in the end,
// which notifies the caller via a completion callback on the original
// calling thread, and then destroys the AppHostInstaller instance.
#include "chrome/browser/extensions/app_host_installer_win.h"
#include <windows.h>
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/process_util.h"
#include "base/string16.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "base/win/registry.h"
#include "chrome/installer/launcher_support/chrome_launcher_support.h"
#include "chrome/installer/util/util_constants.h"
namespace {
using extensions::OnAppHostInstallationCompleteCallback;
// TODO(huangs) Refactor the constants: http://crbug.com/148538
const wchar_t kGoogleRegClientsKey[] = L"Software\\Google\\Update\\Clients";
// Copied from chrome_appid.cc.
const wchar_t kBinariesAppGuid[] = L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}";
// Copied from google_update_constants.cc
const wchar_t kRegCommandLineField[] = L"CommandLine";
const wchar_t kRegCommandsKey[] = L"Commands";
// Copied from util_constants.cc.
const wchar_t kCmdQuickEnableApplicationHost[] =
L"quick-enable-application-host";
// QuickEnableDelegate handles the completion event of App Host installation
// via the quick-enable-application host command. At construction, the
// class is given |callback_| that takes a bool parameter.
// Upon completion, |callback_| is invoked, and is passed a boolean to
// indicate success or failure of installation.
class QuickEnableDelegate : public base::win::ObjectWatcher::Delegate {
public:
explicit QuickEnableDelegate(
const OnAppHostInstallationCompleteCallback& callback);
~QuickEnableDelegate();
// base::win::ObjectWatcher::Delegate implementation.
virtual void OnObjectSignaled(HANDLE object) OVERRIDE;
private:
OnAppHostInstallationCompleteCallback callback_;
DISALLOW_COPY_AND_ASSIGN(QuickEnableDelegate);
};
QuickEnableDelegate::QuickEnableDelegate(
const OnAppHostInstallationCompleteCallback& callback)
: callback_(callback) {}
QuickEnableDelegate::~QuickEnableDelegate() {}
void QuickEnableDelegate::OnObjectSignaled(HANDLE object) {
// Reset callback_ to free up references. But do it now because it's possible
// that callback_.Run() will cause this object to be deleted.
OnAppHostInstallationCompleteCallback callback(callback_);
callback_.Reset();
int exit_code = 0;
base::TerminationStatus status(
base::GetTerminationStatus(object, &exit_code));
if (status == base::TERMINATION_STATUS_NORMAL_TERMINATION) {
callback.Run(true);
} else {
LOG(ERROR) << "App Launcher install failed, status = " << status
<< ", exit code = " << exit_code;
callback.Run(false);
}
// At this point 'this' may be deleted. Don't do anything else here.
}
// Reads the path to app_host.exe from the value "UninstallString" within the
// App Host's "ClientState" registry key. Returns an empty string if the path
// does not exist or cannot be read.
string16 GetQuickEnableAppHostCommand(bool system_level) {
HKEY root_key = system_level ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
string16 subkey(kGoogleRegClientsKey);
subkey.append(1, L'\\').append(kBinariesAppGuid)
.append(1, L'\\').append(kRegCommandsKey)
.append(1, L'\\').append(kCmdQuickEnableApplicationHost);
base::win::RegKey reg_key;
string16 cmd;
if (reg_key.Open(root_key, subkey.c_str(),
KEY_QUERY_VALUE) == ERROR_SUCCESS) {
// If read is unsuccessful, |cmd| remains empty.
reg_key.ReadValue(kRegCommandLineField, &cmd);
}
return cmd;
}
// Launches the Google Update command to quick-enable App Host.
// Returns true if the command is launched.
bool LaunchQuickEnableAppHost(base::win::ScopedHandle* process) {
DCHECK(!process->IsValid());
bool success = false;
string16 cmd_str(GetQuickEnableAppHostCommand(true));
if (cmd_str.empty()) // Try user-level if absent from system-level.
cmd_str = GetQuickEnableAppHostCommand(false);
if (!cmd_str.empty()) {
VLOG(1) << "Quick-enabling application host: " << cmd_str;
if (!base::LaunchProcess(cmd_str, base::LaunchOptions(),
process->Receive())) {
LOG(ERROR) << "Failed to quick-enable application host.";
}
success = process->IsValid();
}
return success;
}
} // namespace
namespace extensions {
using content::BrowserThread;
// static
bool AppHostInstaller::install_with_launcher_ = false;
// static
void AppHostInstaller::EnsureAppHostInstalled(
const OnAppHostInstallationCompleteCallback& completion_callback) {
BrowserThread::ID caller_thread_id;
if (!BrowserThread::GetCurrentThreadIdentifier(&caller_thread_id)) {
NOTREACHED();
return;
}
// AppHostInstaler will delete itself
(new AppHostInstaller(completion_callback, caller_thread_id))->
EnsureAppHostInstalledInternal();
}
void AppHostInstaller::SetInstallWithLauncher(
bool install_with_launcher) {
install_with_launcher_ = install_with_launcher;
}
bool AppHostInstaller::GetInstallWithLauncher() {
return install_with_launcher_;
}
AppHostInstaller::AppHostInstaller(
const OnAppHostInstallationCompleteCallback& completion_callback,
BrowserThread::ID caller_thread_id)
: completion_callback_(completion_callback),
caller_thread_id_(caller_thread_id) {}
AppHostInstaller::~AppHostInstaller() {}
void AppHostInstaller::EnsureAppHostInstalledInternal() {
if (!BrowserThread::CurrentlyOn(BrowserThread::FILE)) {
// Redo on FILE thread.
if (!BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&AppHostInstaller::EnsureAppHostInstalledInternal,
base::Unretained(this)))) {
FinishOnCallerThread(false);
}
return;
}
if ((install_with_launcher_ &&
chrome_launcher_support::IsAppLauncherPresent()) ||
(!install_with_launcher_ &&
chrome_launcher_support::IsAppHostPresent())) {
FinishOnCallerThread(true);
} else {
InstallAppHostOnFileThread();
}
}
void AppHostInstaller::InstallAppHostOnFileThread() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
DCHECK(!process_.IsValid());
if (!LaunchQuickEnableAppHost(&process_)) {
FinishOnCallerThread(false);
} else {
DCHECK(process_.IsValid());
DCHECK(!delegate_.get());
watcher_.StopWatching();
delegate_.reset(new QuickEnableDelegate(
base::Bind(&AppHostInstaller::FinishOnCallerThread,
base::Unretained(this))));
watcher_.StartWatching(process_, delegate_.get());
}
}
void AppHostInstaller::FinishOnCallerThread(bool success) {
if (!BrowserThread::CurrentlyOn(caller_thread_id_)) {
// Redo on caller thread.
if (!BrowserThread::PostTask(caller_thread_id_, FROM_HERE,
base::Bind(&AppHostInstaller::FinishOnCallerThread,
base::Unretained(this),
success))) {
// This could happen in Shutdown....
delete this;
}
return;
}
completion_callback_.Run(success);
delete this;
}
} // namespace extensions
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