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// Copyright 2013 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 "chrome/browser/chromeos/app_mode/kiosk_app_launcher.h"
#include "base/chromeos/chromeos_version.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop.h"
#include "chrome/browser/chromeos/app_mode/startup_app_launcher.h"
#include "chrome/browser/chromeos/login/login_display_host_impl.h"
#include "chrome/browser/chromeos/login/login_utils.h"
#include "chrome/browser/chromeos/login/user_manager.h"
#include "chrome/browser/chromeos/ui/app_launch_view.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chromeos/cryptohome/async_method_caller.h"
#include "chromeos/cryptohome/cryptohome_library.h"
#include "chromeos/dbus/cryptohome_client.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace chromeos {
namespace {
std::string GetAppUserNameFromAppId(const std::string& app_id) {
return app_id + "@" + UserManager::kKioskAppUserDomain;
}
} // namespace
// static
KioskAppLauncher* KioskAppLauncher::running_instance_ = NULL;
////////////////////////////////////////////////////////////////////////////////
// KioskAppLauncher::CryptohomedChecker ensures cryptohome daemon is up
// and running by issuing an IsMounted call. If the call does not go through
// and chromeos::DBUS_METHOD_CALL_SUCCESS is not returned, it will retry after
// some time out and at the maximum five times before it gives up. Upon
// success, it resumes the launch by calling KioskAppLauncher::StartMount.
class KioskAppLauncher::CryptohomedChecker
: public base::SupportsWeakPtr<CryptohomedChecker> {
public:
explicit CryptohomedChecker(KioskAppLauncher* launcher)
: launcher_(launcher),
retry_count_(0) {
}
~CryptohomedChecker() {}
void StartCheck() {
chromeos::DBusThreadManager::Get()->GetCryptohomeClient()->IsMounted(
base::Bind(&CryptohomedChecker::OnCryptohomeIsMounted,
AsWeakPtr()));
}
private:
void OnCryptohomeIsMounted(chromeos::DBusMethodCallStatus call_status,
bool is_mounted) {
if (call_status != chromeos::DBUS_METHOD_CALL_SUCCESS) {
const int kMaxRetryTimes = 5;
++retry_count_;
if (retry_count_ > kMaxRetryTimes) {
LOG(ERROR) << "Could not talk to cryptohomed for launching kiosk app.";
ReportCheckResult(KioskAppLaunchError::CRYPTOHOMED_NOT_RUNNING);
return;
}
const int retry_delay_in_milliseconds = 500 * (1 << retry_count_);
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&CryptohomedChecker::StartCheck, AsWeakPtr()),
base::TimeDelta::FromMilliseconds(retry_delay_in_milliseconds));
return;
}
if (is_mounted)
LOG(ERROR) << "Cryptohome is mounted before launching kiosk app.";
// Proceed only when cryptohome is not mounded or running on dev box.
if (!is_mounted || !base::chromeos::IsRunningOnChromeOS())
ReportCheckResult(KioskAppLaunchError::NONE);
else
ReportCheckResult(KioskAppLaunchError::ALREADY_MOUNTED);
}
void ReportCheckResult(KioskAppLaunchError::Error error) {
if (error == KioskAppLaunchError::NONE)
launcher_->StartMount();
else
launcher_->ReportLaunchResult(error);
}
KioskAppLauncher* launcher_;
int retry_count_;
DISALLOW_COPY_AND_ASSIGN(CryptohomedChecker);
};
////////////////////////////////////////////////////////////////////////////////
// KioskAppLauncher::ProfileLoader creates or loads the app profile.
class KioskAppLauncher::ProfileLoader : public LoginUtils::Delegate {
public:
explicit ProfileLoader(KioskAppLauncher* launcher)
: launcher_(launcher) {
}
virtual ~ProfileLoader() {
LoginUtils::Get()->DelegateDeleted(this);
}
void Start() {
// TODO(nkostylev): Pass real username_hash here.
LoginUtils::Get()->PrepareProfile(
UserContext(GetAppUserNameFromAppId(launcher_->app_id_),
std::string(), // password
std::string()), // auth_code
std::string(), // display email
false, // using_oauth
false, // has_cookies
this);
}
private:
// LoginUtils::Delegate overrides:
virtual void OnProfilePrepared(Profile* profile) OVERRIDE {
launcher_->OnProfilePrepared(profile);
}
KioskAppLauncher* launcher_;
DISALLOW_COPY_AND_ASSIGN(ProfileLoader);
};
////////////////////////////////////////////////////////////////////////////////
// KioskAppLauncher
KioskAppLauncher::KioskAppLauncher(const std::string& app_id)
: app_id_(app_id),
remove_attempted_(false) {
}
KioskAppLauncher::~KioskAppLauncher() {}
void KioskAppLauncher::Start() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (running_instance_) {
LOG(WARNING) << "Unable to launch " << app_id_ << "with a pending launch.";
ReportLaunchResult(KioskAppLaunchError::HAS_PENDING_LAUNCH);
return;
}
running_instance_ = this; // Reset in ReportLaunchResult.
// Show app launch splash. The spash is removed either after a successful
// launch or chrome exit because of launch failure.
chromeos::ShowAppLaunchSplashScreen(app_id_);
// Check cryptohomed. If all goes good, flow goes to StartMount. Otherwise
// it goes to ReportLaunchResult with failure.
crytohomed_checker.reset(new CryptohomedChecker(this));
crytohomed_checker->StartCheck();
}
void KioskAppLauncher::ReportLaunchResult(KioskAppLaunchError::Error error) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
running_instance_ = NULL;
if (error != KioskAppLaunchError::NONE) {
// Saves the error and ends the session to go back to login screen.
KioskAppLaunchError::Save(error);
chrome::AttemptUserExit();
}
delete this;
}
void KioskAppLauncher::StartMount() {
const std::string token =
CryptohomeLibrary::Get()->EncryptWithSystemSalt(app_id_);
cryptohome::AsyncMethodCaller::GetInstance()->AsyncMount(
app_id_,
token,
cryptohome::CREATE_IF_MISSING,
base::Bind(&KioskAppLauncher::MountCallback,
base::Unretained(this)));
}
void KioskAppLauncher::MountCallback(bool mount_success,
cryptohome::MountError mount_error) {
if (mount_success) {
profile_loader_.reset(new ProfileLoader(this));
profile_loader_->Start();
return;
}
if (!remove_attempted_) {
LOG(ERROR) << "Attempt to remove app cryptohome because of mount failure"
<< ", mount error=" << mount_error;
remove_attempted_ = true;
AttemptRemove();
return;
}
LOG(ERROR) << "Failed to mount app cryptohome, error=" << mount_error;
ReportLaunchResult(KioskAppLaunchError::UNABLE_TO_MOUNT);
}
void KioskAppLauncher::AttemptRemove() {
cryptohome::AsyncMethodCaller::GetInstance()->AsyncRemove(
app_id_,
base::Bind(&KioskAppLauncher::RemoveCallback,
base::Unretained(this)));
}
void KioskAppLauncher::RemoveCallback(bool success,
cryptohome::MountError return_code) {
if (success) {
StartMount();
return;
}
LOG(ERROR) << "Failed to remove app cryptohome, erro=" << return_code;
ReportLaunchResult(KioskAppLaunchError::UNABLE_TO_REMOVE);
}
void KioskAppLauncher::OnProfilePrepared(Profile* profile) {
// StartupAppLauncher deletes itself when done.
(new chromeos::StartupAppLauncher(profile, app_id_))->Start();
if (LoginDisplayHostImpl::default_host())
LoginDisplayHostImpl::default_host()->OnSessionStart();
UserManager::Get()->SessionStarted();
ReportLaunchResult(KioskAppLaunchError::NONE);
}
} // namespace chromeos
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