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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/chromeos/policy/user_policy_token_loader.h"
      6 
      7 #include "base/bind.h"
      8 #include "base/file_util.h"
      9 #include "base/location.h"
     10 #include "base/message_loop/message_loop_proxy.h"
     11 #include "base/metrics/histogram.h"
     12 #include "base/sequenced_task_runner.h"
     13 #include "components/policy/core/common/cloud/enterprise_metrics.h"
     14 #include "policy/proto/device_management_local.pb.h"
     15 
     16 namespace policy {
     17 
     18 namespace em = enterprise_management;
     19 
     20 UserPolicyTokenLoader::Delegate::~Delegate() {}
     21 
     22 UserPolicyTokenLoader::UserPolicyTokenLoader(
     23     const base::WeakPtr<Delegate>& delegate,
     24     const base::FilePath& cache_file,
     25     scoped_refptr<base::SequencedTaskRunner> background_task_runner)
     26     : delegate_(delegate),
     27       cache_file_(cache_file),
     28       origin_task_runner_(base::MessageLoopProxy::current()),
     29       background_task_runner_(background_task_runner) {}
     30 
     31 void UserPolicyTokenLoader::Load() {
     32   DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
     33   background_task_runner_->PostTask(
     34       FROM_HERE,
     35       base::Bind(&UserPolicyTokenLoader::LoadOnBackgroundThread, this));
     36 }
     37 
     38 UserPolicyTokenLoader::~UserPolicyTokenLoader() {
     39 }
     40 
     41 void UserPolicyTokenLoader::LoadOnBackgroundThread() {
     42   DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
     43   std::string device_token;
     44   std::string device_id;
     45 
     46   if (base::PathExists(cache_file_)) {
     47     std::string data;
     48     em::DeviceCredentials device_credentials;
     49     if (base::ReadFileToString(cache_file_, &data) &&
     50         device_credentials.ParseFromArray(data.c_str(), data.size())) {
     51       device_token = device_credentials.device_token();
     52       device_id = device_credentials.device_id();
     53       UMA_HISTOGRAM_ENUMERATION(policy::kMetricToken,
     54                                 kMetricTokenLoadSucceeded,
     55                                 policy::kMetricTokenSize);
     56     } else {
     57       UMA_HISTOGRAM_ENUMERATION(policy::kMetricToken,
     58                                 kMetricTokenLoadFailed,
     59                                 policy::kMetricTokenSize);
     60     }
     61   }
     62 
     63   origin_task_runner_->PostTask(
     64       FROM_HERE,
     65       base::Bind(&UserPolicyTokenLoader::NotifyOnOriginThread,
     66                  this,
     67                  device_token,
     68                  device_id));
     69 }
     70 
     71 void UserPolicyTokenLoader::NotifyOnOriginThread(const std::string& token,
     72                                                  const std::string& device_id) {
     73   DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
     74   if (delegate_.get())
     75     delegate_->OnTokenLoaded(token, device_id);
     76 }
     77 
     78 }  // namespace policy
     79