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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/message_loop.h"
#include "chrome/browser/policy/cloud_policy_cache.h"
#include "chrome/browser/policy/device_management_service.h"
#include "chrome/browser/policy/proto/device_management_local.pb.h"
namespace {
// Retry after 3 seconds (with exponential backoff) after token fetch errors.
const int64 kTokenFetchErrorDelayMilliseconds = 3 * 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,
CloudPolicyCache* cache)
: ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {
Initialize(service,
cache,
kTokenFetchErrorDelayMilliseconds,
kUnmanagedDeviceRefreshRateMilliseconds);
}
DeviceTokenFetcher::DeviceTokenFetcher(
DeviceManagementService* service,
CloudPolicyCache* cache,
int64 token_fetch_error_delay_ms,
int64 unmanaged_device_refresh_rate_ms)
: ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {
Initialize(service,
cache,
token_fetch_error_delay_ms,
unmanaged_device_refresh_rate_ms);
}
DeviceTokenFetcher::~DeviceTokenFetcher() {
CancelRetryTask();
}
void DeviceTokenFetcher::FetchToken(const std::string& auth_token,
const std::string& device_id) {
SetState(STATE_INACTIVE);
auth_token_ = auth_token;
device_id_ = device_id;
FetchTokenInternal();
}
void DeviceTokenFetcher::FetchTokenInternal() {
DCHECK(state_ != STATE_TOKEN_AVAILABLE);
DCHECK(!auth_token_.empty() && !device_id_.empty());
// Construct a new backend, which will discard any previous requests.
backend_.reset(service_->CreateBackend());
em::DeviceRegisterRequest request;
backend_->ProcessRegisterRequest(auth_token_, device_id_, request, this);
}
const std::string& DeviceTokenFetcher::GetDeviceToken() {
return device_token_;
}
void DeviceTokenFetcher::AddObserver(DeviceTokenFetcher::Observer* observer) {
observer_list_.AddObserver(observer);
}
void DeviceTokenFetcher::RemoveObserver(
DeviceTokenFetcher::Observer* observer) {
observer_list_.RemoveObserver(observer);
}
void DeviceTokenFetcher::HandleRegisterResponse(
const em::DeviceRegisterResponse& response) {
if (response.has_device_management_token()) {
device_token_ = response.device_management_token();
SetState(STATE_TOKEN_AVAILABLE);
} else {
NOTREACHED();
SetState(STATE_ERROR);
}
}
void DeviceTokenFetcher::OnError(DeviceManagementBackend::ErrorCode code) {
if (code == DeviceManagementBackend::kErrorServiceManagementNotSupported) {
cache_->SetUnmanaged();
SetState(STATE_UNMANAGED);
}
SetState(STATE_ERROR);
}
void DeviceTokenFetcher::Initialize(DeviceManagementService* service,
CloudPolicyCache* cache,
int64 token_fetch_error_delay_ms,
int64 unmanaged_device_refresh_rate_ms) {
service_ = service;
cache_ = cache;
token_fetch_error_delay_ms_ = token_fetch_error_delay_ms;
effective_token_fetch_error_delay_ms_ = token_fetch_error_delay_ms;
unmanaged_device_refresh_rate_ms_ = unmanaged_device_refresh_rate_ms;
state_ = STATE_INACTIVE;
retry_task_ = NULL;
if (cache_->is_unmanaged())
SetState(STATE_UNMANAGED);
}
void DeviceTokenFetcher::SetState(FetcherState state) {
state_ = state;
if (state_ != STATE_ERROR)
effective_token_fetch_error_delay_ms_ = token_fetch_error_delay_ms_;
base::Time delayed_work_at;
switch (state_) {
case STATE_INACTIVE:
device_token_.clear();
auth_token_.clear();
device_id_.clear();
break;
case STATE_TOKEN_AVAILABLE:
FOR_EACH_OBSERVER(Observer, observer_list_, OnDeviceTokenAvailable());
break;
case STATE_UNMANAGED:
delayed_work_at = cache_->last_policy_refresh_time() +
base::TimeDelta::FromMilliseconds(unmanaged_device_refresh_rate_ms_);
break;
case STATE_ERROR:
delayed_work_at = base::Time::Now() +
base::TimeDelta::FromMilliseconds(
effective_token_fetch_error_delay_ms_);
effective_token_fetch_error_delay_ms_ *= 2;
break;
}
CancelRetryTask();
if (!delayed_work_at.is_null()) {
base::Time now(base::Time::Now());
int64 delay = std::max<int64>((delayed_work_at - now).InMilliseconds(), 0);
retry_task_ = method_factory_.NewRunnableMethod(
&DeviceTokenFetcher::ExecuteRetryTask);
MessageLoop::current()->PostDelayedTask(FROM_HERE, retry_task_,
delay);
}
}
void DeviceTokenFetcher::ExecuteRetryTask() {
DCHECK(retry_task_);
retry_task_ = NULL;
switch (state_) {
case STATE_INACTIVE:
case STATE_TOKEN_AVAILABLE:
break;
case STATE_UNMANAGED:
case STATE_ERROR:
FetchTokenInternal();
break;
}
}
void DeviceTokenFetcher::CancelRetryTask() {
if (retry_task_) {
retry_task_->Cancel();
retry_task_ = NULL;
}
}
} // namespace policy
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