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// Copyright (c) 2011 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_token_fetcher.h"
#include <algorithm>
#include "base/bind.h"
#include "base/callback.h"
#include "base/metrics/histogram.h"
#include "chrome/browser/policy/cloud_policy_cache_base.h"
#include "chrome/browser/policy/cloud_policy_data_store.h"
#include "chrome/browser/policy/device_management_service.h"
#include "chrome/browser/policy/enterprise_metrics.h"
#include "chrome/browser/policy/proto/device_management_constants.h"
#include "chrome/browser/policy/proto/device_management_local.pb.h"
namespace {
// Retry after 5 minutes (with exponential backoff) after token fetch errors.
const int64 kTokenFetchErrorDelayMilliseconds = 5 * 60 * 1000;
// Retry after max 3 hours after token fetch errors.
const int64 kTokenFetchErrorMaxDelayMilliseconds = 3 * 60 * 60 * 1000;
// For unmanaged devices, check once per day whether they're still unmanaged.
const int64 kUnmanagedDeviceRefreshRateMilliseconds = 24 * 60 * 60 * 1000;
} // namespace
namespace policy {
namespace em = enterprise_management;
DeviceTokenFetcher::DeviceTokenFetcher(
DeviceManagementService* service,
CloudPolicyCacheBase* cache,
CloudPolicyDataStore* data_store,
PolicyNotifier* notifier) {
Initialize(service,
cache,
data_store,
notifier,
new DelayedWorkScheduler);
}
DeviceTokenFetcher::DeviceTokenFetcher(
DeviceManagementService* service,
CloudPolicyCacheBase* cache,
CloudPolicyDataStore* data_store,
PolicyNotifier* notifier,
DelayedWorkScheduler* scheduler) {
Initialize(service, cache, data_store, notifier, scheduler);
}
DeviceTokenFetcher::~DeviceTokenFetcher() {
scheduler_->CancelDelayedWork();
}
void DeviceTokenFetcher::FetchToken() {
SetState(STATE_INACTIVE);
FetchTokenInternal();
}
void DeviceTokenFetcher::FetchTokenInternal() {
DCHECK(state_ != STATE_TOKEN_AVAILABLE);
if (data_store_->gaia_token().empty() || data_store_->device_id().empty()) {
// Maybe this device is unmanaged, just exit. The CloudPolicyController
// will call FetchToken() again if something changes.
return;
}
// Construct a new backend, which will discard any previous requests.
backend_.reset(service_->CreateBackend());
em::DeviceRegisterRequest request;
request.set_type(data_store_->policy_register_type());
if (!data_store_->machine_id().empty())
request.set_machine_id(data_store_->machine_id());
if (!data_store_->machine_model().empty())
request.set_machine_model(data_store_->machine_model());
backend_->ProcessRegisterRequest(data_store_->gaia_token(),
data_store_->device_id(),
request, this);
}
void DeviceTokenFetcher::SetUnmanagedState() {
// The call to |cache_->SetUnmanaged()| has to happen first because it sets
// the timestamp that |SetState()| needs to determine the correct refresh
// time.
cache_->SetUnmanaged();
SetState(STATE_UNMANAGED);
}
void DeviceTokenFetcher::StopAutoRetry() {
scheduler_->CancelDelayedWork();
backend_.reset();
}
void DeviceTokenFetcher::HandleRegisterResponse(
const em::DeviceRegisterResponse& response) {
if (response.has_device_management_token()) {
UMA_HISTOGRAM_ENUMERATION(kMetricToken, kMetricTokenFetchOK,
kMetricTokenSize);
data_store_->SetDeviceToken(response.device_management_token(), false);
SetState(STATE_TOKEN_AVAILABLE);
} else {
NOTREACHED();
UMA_HISTOGRAM_ENUMERATION(kMetricToken, kMetricTokenFetchBadResponse,
kMetricTokenSize);
SetState(STATE_ERROR);
}
}
void DeviceTokenFetcher::OnError(DeviceManagementBackend::ErrorCode code) {
switch (code) {
case DeviceManagementBackend::kErrorServiceManagementNotSupported:
cache_->SetUnmanaged();
SetState(STATE_UNMANAGED);
break;
case DeviceManagementBackend::kErrorRequestFailed:
case DeviceManagementBackend::kErrorTemporaryUnavailable:
case DeviceManagementBackend::kErrorServiceDeviceNotFound:
SetState(STATE_TEMPORARY_ERROR);
break;
case DeviceManagementBackend::kErrorServiceManagementTokenInvalid:
// Most probably the GAIA auth cookie has expired. We can not do anything
// until the user logs-in again.
SetState(STATE_BAD_AUTH);
break;
default:
SetState(STATE_ERROR);
}
}
void DeviceTokenFetcher::Initialize(DeviceManagementService* service,
CloudPolicyCacheBase* cache,
CloudPolicyDataStore* data_store,
PolicyNotifier* notifier,
DelayedWorkScheduler* scheduler) {
service_ = service;
cache_ = cache;
notifier_ = notifier;
data_store_ = data_store;
effective_token_fetch_error_delay_ms_ = kTokenFetchErrorDelayMilliseconds;
state_ = STATE_INACTIVE;
scheduler_.reset(scheduler);
if (cache_->is_unmanaged())
SetState(STATE_UNMANAGED);
}
void DeviceTokenFetcher::SetState(FetcherState state) {
state_ = state;
if (state_ != STATE_TEMPORARY_ERROR)
effective_token_fetch_error_delay_ms_ = kTokenFetchErrorDelayMilliseconds;
base::Time delayed_work_at;
switch (state_) {
case STATE_INACTIVE:
notifier_->Inform(CloudPolicySubsystem::UNENROLLED,
CloudPolicySubsystem::NO_DETAILS,
PolicyNotifier::TOKEN_FETCHER);
break;
case STATE_TOKEN_AVAILABLE:
notifier_->Inform(CloudPolicySubsystem::SUCCESS,
CloudPolicySubsystem::NO_DETAILS,
PolicyNotifier::TOKEN_FETCHER);
break;
case STATE_UNMANAGED:
delayed_work_at = cache_->last_policy_refresh_time() +
base::TimeDelta::FromMilliseconds(
kUnmanagedDeviceRefreshRateMilliseconds);
notifier_->Inform(CloudPolicySubsystem::UNMANAGED,
CloudPolicySubsystem::NO_DETAILS,
PolicyNotifier::TOKEN_FETCHER);
break;
case STATE_TEMPORARY_ERROR:
delayed_work_at = base::Time::Now() +
base::TimeDelta::FromMilliseconds(
effective_token_fetch_error_delay_ms_);
effective_token_fetch_error_delay_ms_ =
std::min(effective_token_fetch_error_delay_ms_ * 2,
kTokenFetchErrorMaxDelayMilliseconds);
notifier_->Inform(CloudPolicySubsystem::NETWORK_ERROR,
CloudPolicySubsystem::DMTOKEN_NETWORK_ERROR,
PolicyNotifier::TOKEN_FETCHER);
break;
case STATE_ERROR:
effective_token_fetch_error_delay_ms_ =
kTokenFetchErrorMaxDelayMilliseconds;
delayed_work_at = base::Time::Now() +
base::TimeDelta::FromMilliseconds(
effective_token_fetch_error_delay_ms_);
notifier_->Inform(CloudPolicySubsystem::NETWORK_ERROR,
CloudPolicySubsystem::DMTOKEN_NETWORK_ERROR,
PolicyNotifier::TOKEN_FETCHER);
break;
case STATE_BAD_AUTH:
// Can't do anything, need to wait for new credentials.
notifier_->Inform(CloudPolicySubsystem::BAD_GAIA_TOKEN,
CloudPolicySubsystem::NO_DETAILS,
PolicyNotifier::TOKEN_FETCHER);
break;
}
scheduler_->CancelDelayedWork();
if (!delayed_work_at.is_null()) {
base::Time now(base::Time::Now());
int64 delay = std::max<int64>((delayed_work_at - now).InMilliseconds(), 0);
scheduler_->PostDelayedWork(
base::Bind(&DeviceTokenFetcher::DoWork, base::Unretained(this)), delay);
}
}
void DeviceTokenFetcher::DoWork() {
switch (state_) {
case STATE_INACTIVE:
case STATE_TOKEN_AVAILABLE:
break;
case STATE_UNMANAGED:
case STATE_ERROR:
case STATE_TEMPORARY_ERROR:
case STATE_BAD_AUTH:
FetchTokenInternal();
break;
}
}
} // namespace policy
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