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// Copyright (c) 2010 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/policy/device_management_policy_provider.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/path_service.h"
#include "base/task.h"
#include "base/time.h"
#include "chrome/browser/browser_thread.h"
#include "chrome/browser/policy/device_management_backend.h"
#include "chrome/browser/policy/device_management_backend_impl.h"
#include "chrome/browser/policy/device_management_policy_cache.h"
#include "chrome/browser/policy/device_token_fetcher.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/notification_service.h"
#include "chrome/common/notification_type.h"
namespace {
const char kChromePolicyScope[] = "cros/device";
const char kChromeDevicePolicySettingKey[] = "chrome-policy";
const int64 kPolicyRefreshRateInMinutes = 3 * 60; // 3 hours
} // namespace
namespace policy {
// Ensures that the portion of the policy provider implementation that requires
// the IOThread is deferred until the IOThread is fully initialized. The policy
// provider posts this task on the UI thread during its constructor, thereby
// guaranteeing that the code won't get executed until after the UI and IO
// threads are fully constructed.
class DeviceManagementPolicyProvider::InitializeAfterIOThreadExistsTask
: public Task {
public:
explicit InitializeAfterIOThreadExistsTask(
base::WeakPtr<DeviceManagementPolicyProvider> provider)
: provider_(provider) {
}
// Task implementation:
virtual void Run() {
DeviceManagementPolicyProvider* provider = provider_.get();
if (provider)
provider->InitializeAfterIOThreadExists();
}
private:
base::WeakPtr<DeviceManagementPolicyProvider> provider_;
};
DeviceManagementPolicyProvider::DeviceManagementPolicyProvider(
const ConfigurationPolicyProvider::PolicyDefinitionList* policy_list,
DeviceManagementBackend* backend,
const FilePath& storage_dir)
: ConfigurationPolicyProvider(policy_list),
backend_(backend),
storage_dir_(GetOrCreateDeviceManagementDir(storage_dir)),
policy_request_pending_(false) {
Initialize();
}
DeviceManagementPolicyProvider::DeviceManagementPolicyProvider(
const ConfigurationPolicyProvider::PolicyDefinitionList* policy_list)
: ConfigurationPolicyProvider(policy_list),
policy_request_pending_(false) {
FilePath user_dir;
if (!PathService::Get(chrome::DIR_USER_DATA, &user_dir))
NOTREACHED();
storage_dir_ = GetOrCreateDeviceManagementDir(user_dir);
Initialize();
}
DeviceManagementPolicyProvider::~DeviceManagementPolicyProvider() {}
bool DeviceManagementPolicyProvider::Provide(
ConfigurationPolicyStoreInterface* policy_store) {
scoped_ptr<DictionaryValue> policies(cache_->GetPolicy());
DecodePolicyValueTree(policies.get(), policy_store);
return true;
}
void DeviceManagementPolicyProvider::Observe(
NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
if ((type == NotificationType::DEVICE_TOKEN_AVAILABLE) &&
(token_fetcher_.get() == Source<DeviceTokenFetcher>(source).ptr())) {
if (!policy_request_pending_) {
if (IsPolicyStale())
SendPolicyRequest();
}
} else {
NOTREACHED();
}
}
void DeviceManagementPolicyProvider::HandlePolicyResponse(
const em::DevicePolicyResponse& response) {
cache_->SetPolicy(response);
NotifyStoreOfPolicyChange();
policy_request_pending_ = false;
}
void DeviceManagementPolicyProvider::OnError(
DeviceManagementBackend::ErrorCode code) {
LOG(WARNING) << "could not provide policy from the device manager (error = "
<< code << ")";
policy_request_pending_ = false;
// TODO(danno): do something sensible in the error case, perhaps retry later?
}
DeviceManagementBackend* DeviceManagementPolicyProvider::GetBackend() {
if (!backend_.get()) {
backend_.reset(new DeviceManagementBackendImpl(
GetDeviceManagementURL()));
}
return backend_.get();
}
void DeviceManagementPolicyProvider::Initialize() {
registrar_.Add(this,
NotificationType::DEVICE_TOKEN_AVAILABLE,
NotificationService::AllSources());
const FilePath policy_path = storage_dir_.Append(
FILE_PATH_LITERAL("Policy"));
cache_.reset(new DeviceManagementPolicyCache(policy_path));
cache_->LoadPolicyFromFile();
// Defer initialization that requires the IOThread until after the IOThread
// has been initialized.
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
new InitializeAfterIOThreadExistsTask(AsWeakPtr()));
}
void DeviceManagementPolicyProvider::InitializeAfterIOThreadExists() {
const FilePath token_path = storage_dir_.Append(
FILE_PATH_LITERAL("Token"));
token_fetcher_ = new DeviceTokenFetcher(GetBackend(), token_path);
token_fetcher_->StartFetching();
}
void DeviceManagementPolicyProvider::SendPolicyRequest() {
if (!policy_request_pending_) {
em::DevicePolicyRequest policy_request;
policy_request.set_policy_scope(kChromePolicyScope);
em::DevicePolicySettingRequest* setting =
policy_request.add_setting_request();
setting->set_key(kChromeDevicePolicySettingKey);
GetBackend()->ProcessPolicyRequest(token_fetcher_->GetDeviceToken(),
policy_request,
this);
policy_request_pending_ = true;
}
}
bool DeviceManagementPolicyProvider::IsPolicyStale() const {
base::Time now(base::Time::NowFromSystemTime());
base::Time last_policy_refresh_time =
cache_->last_policy_refresh_time();
base::Time policy_expiration_time =
last_policy_refresh_time + base::TimeDelta::FromMinutes(
kPolicyRefreshRateInMinutes);
return (now > policy_expiration_time);
}
// static
std::string DeviceManagementPolicyProvider::GetDeviceManagementURL() {
return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kDeviceManagementUrl);
}
// static
FilePath DeviceManagementPolicyProvider::GetOrCreateDeviceManagementDir(
const FilePath& user_data_dir) {
const FilePath device_management_dir = user_data_dir.Append(
FILE_PATH_LITERAL("Device Management"));
if (!file_util::DirectoryExists(device_management_dir)) {
if (!file_util::CreateDirectory(device_management_dir))
NOTREACHED();
}
return device_management_dir;
}
} // namespace policy
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