Add device location reporting

chrome/browser/policy/device_status_collector.cc

 // Copyright (c) 2012 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_status_collector.h"
 
 #include "base/bind.h"
-#include "base/callback.h"
+#include "base/bind_helpers.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
+#include "base/values.h"
 #include "chrome/browser/chromeos/cros_settings.h"
 #include "chrome/browser/chromeos/cros_settings_names.h"
 #include "chrome/browser/chromeos/system/statistics_provider.h"
 #include "chrome/browser/policy/proto/device_management_backend.pb.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/pref_names.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_source.h"
 
 using base::Time;
 using base::TimeDelta;
 using chromeos::VersionLoader;
 
 namespace em = enterprise_management;
 
 namespace {
 // How many seconds of inactivity triggers the idle state.
 const unsigned int kIdleStateThresholdSeconds = 300;
 
 // How many days in the past to store active periods for.
 const unsigned int kMaxStoredPastActivityDays = 30;
 
 // How many days in the future to store active periods for.
 const unsigned int kMaxStoredFutureActivityDays = 2;
 
+// How often, in seconds, to update the device location.
+const unsigned int kGeolocationPollIntervalSeconds = 30 * 60;
+
 const int64 kMillisecondsPerDay = Time::kMicrosecondsPerDay / 1000;
 
 // Record device activity for the specified day into the given dictionary.
 void AddDeviceActivity(DictionaryValue* activity_times,
                        Time day_midnight,
                        TimeDelta activity) {
   DCHECK(activity.InMilliseconds() < kMillisecondsPerDay);
   int64 day_start_timestamp =
       (day_midnight - Time::UnixEpoch()).InMilliseconds();
   std::string day_key = base::Int64ToString(day_start_timestamp);
   int previous_activity = 0;
   activity_times->GetInteger(day_key, &previous_activity);
   activity_times->SetInteger(day_key,
                              previous_activity + activity.InMilliseconds());
 }
 
 }  // namespace
 
 namespace policy {
 
 DeviceStatusCollector::DeviceStatusCollector(
     PrefService* local_state,
-    chromeos::system::StatisticsProvider* provider)
+    chromeos::system::StatisticsProvider* provider,
+    LocationUpdateRequester location_update_requester)
     : max_stored_past_activity_days_(kMaxStoredPastActivityDays),
       max_stored_future_activity_days_(kMaxStoredFutureActivityDays),
       local_state_(local_state),
       last_idle_check_(Time()),
+      geolocation_update_in_progress_(false),
       statistics_provider_(provider),
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
+      location_update_requester_(location_update_requester),
       report_version_info_(false),
       report_activity_times_(false),
-      report_boot_mode_(false) {
-  timer_.Start(FROM_HERE,
-               TimeDelta::FromSeconds(kPollIntervalSeconds),
-               this, &DeviceStatusCollector::CheckIdleState);
+      report_boot_mode_(false),
+      report_location_(false) {
+  if (!location_update_requester_)
+    location_update_requester_ = &content::RequestLocationUpdate;
+  idle_poll_timer_.Start(FROM_HERE,
+                         TimeDelta::FromSeconds(kIdlePollIntervalSeconds),
+                         this, &DeviceStatusCollector::CheckIdleState);
 
   cros_settings_ = chromeos::CrosSettings::Get();
 
   // Watch for changes to the individual policies that control what the status
   // reports contain.
   cros_settings_->AddSettingsObserver(chromeos::kReportDeviceVersionInfo, this);
   cros_settings_->AddSettingsObserver(chromeos::kReportDeviceActivityTimes,
                                       this);
   cros_settings_->AddSettingsObserver(chromeos::kReportDeviceBootMode, this);
+  cros_settings_->AddSettingsObserver(chromeos::kReportDeviceLocation, this);
+
+  // The last known location is persisted in local state. This makes location
+  // information available immediately upon startup and avoids the need to
+  // reacquire the location on every user session change or browser crash.
+  content::Geoposition position;
+  std::string timestamp_str;
+  int64 timestamp;
+  const base::DictionaryValue* location =
+      local_state_->GetDictionary(prefs::kDeviceLocation);
+  if (location->GetDouble("latitude", &position.latitude) &&

[Joao da Silva, 2012/05/03 19:04:08]

It'd be nicer to use constants for these strings:

namespace {
const char kLatitude[] = "latitude";
...
}

[bartfab (slow), 2012/05/04 09:14:57]

Done.

+      location->GetDouble("longitude", &position.longitude) &&
+      location->GetDouble("altitude", &position.altitude) &&
+      location->GetDouble("accuracy", &position.accuracy) &&
+      location->GetDouble("altitude_accuracy",
+                          &position.altitude_accuracy) &&
+      location->GetDouble("heading", &position.heading) &&
+      location->GetDouble("speed", &position.speed) &&
+      location->GetString("timestamp", &timestamp_str) &&
+      base::StringToInt64(timestamp_str, &timestamp)) {
+    position.timestamp = base::Time::FromInternalValue(timestamp);

[Joao da Silva, 2012/05/03 19:04:08]

nit: drop the base::

[bartfab (slow), 2012/05/04 09:14:57]

Done.

+    position_ = position;
+  }
 
   // Fetch the current values of the policies.
   UpdateReportingSettings();
 
   // Get the the OS and firmware version info.
   version_loader_.GetVersion(&consumer_,
                              base::Bind(&DeviceStatusCollector::OnOSVersion,
                                         base::Unretained(this)),
                              VersionLoader::VERSION_FULL);
   version_loader_.GetFirmware(&consumer_,
                               base::Bind(&DeviceStatusCollector::OnOSFirmware,
                                          base::Unretained(this)));
 }
 
 DeviceStatusCollector::~DeviceStatusCollector() {
   cros_settings_->RemoveSettingsObserver(chromeos::kReportDeviceVersionInfo,
                                          this);
   cros_settings_->RemoveSettingsObserver(chromeos::kReportDeviceActivityTimes,
                                          this);
   cros_settings_->RemoveSettingsObserver(chromeos::kReportDeviceBootMode, this);
+  cros_settings_->RemoveSettingsObserver(chromeos::kReportDeviceLocation, this);
 }
 
 // static
 void DeviceStatusCollector::RegisterPrefs(PrefService* local_state) {
   local_state->RegisterDictionaryPref(prefs::kDeviceActivityTimes,
                                       new DictionaryValue);
+  local_state->RegisterDictionaryPref(prefs::kDeviceLocation,
+                                      new DictionaryValue);
 }
 
 void DeviceStatusCollector::CheckIdleState() {
   CalculateIdleState(kIdleStateThresholdSeconds,
       base::Bind(&DeviceStatusCollector::IdleStateCallback,
                  base::Unretained(this)));
 }
 
 void DeviceStatusCollector::UpdateReportingSettings() {
   // Attempt to fetch the current value of the reporting settings.
   // If trusted values are not available, register this function to be called
   // back when they are available.
   if (!cros_settings_->PrepareTrustedValues(
       base::Bind(&DeviceStatusCollector::UpdateReportingSettings,
                  base::Unretained(this)))) {
     return;
   }
   cros_settings_->GetBoolean(
       chromeos::kReportDeviceVersionInfo, &report_version_info_);
   cros_settings_->GetBoolean(
       chromeos::kReportDeviceActivityTimes, &report_activity_times_);
   cros_settings_->GetBoolean(
       chromeos::kReportDeviceBootMode, &report_boot_mode_);
+  cros_settings_->GetBoolean(
+      chromeos::kReportDeviceLocation, &report_location_);
+
+  if (report_location_) {
+    ScheduleGeolocationUpdateRequest();
+  } else {
+    geolocation_update_timer_.Stop();
+    position_ = content::Geoposition();
+    local_state_->ClearPref(prefs::kDeviceLocation);
+  }
 }
 
 Time DeviceStatusCollector::GetCurrentTime() {
   return Time::Now();
 }
 
 // Remove all out-of-range activity times from the local store.
 void DeviceStatusCollector::PruneStoredActivityPeriods(Time base_time) {
   const DictionaryValue* activity_times =
       local_state_->GetDictionary(prefs::kDeviceActivityTimes);
@@ skipping 56 matching lines @@
     return;
 
   Time now = GetCurrentTime();
 
   if (state == IDLE_STATE_ACTIVE) {
     // If it's been too long since the last report, or if the activity is
     // negative (which can happen when the clock changes), assume a single
     // interval of activity.
     int active_seconds = (now - last_idle_check_).InSeconds();
     if (active_seconds < 0 ||
-        active_seconds >= static_cast<int>((2 * kPollIntervalSeconds)))
-      AddActivePeriod(now - TimeDelta::FromSeconds(kPollIntervalSeconds), now);
+        active_seconds >= static_cast<int>((2 * kIdlePollIntervalSeconds)))
+      AddActivePeriod(now - TimeDelta::FromSeconds(kIdlePollIntervalSeconds),
+                      now);
     else
       AddActivePeriod(last_idle_check_, now);
 
     PruneStoredActivityPeriods(now);
   }
   last_idle_check_ = now;
 }
 
 void DeviceStatusCollector::GetActivityTimes(
     em::DeviceStatusReportRequest* request) {
@@ skipping 35 matching lines @@
   std::string dev_switch_mode;
   if (statistics_provider_->GetMachineStatistic(
       "devsw_boot", &dev_switch_mode)) {
     if (dev_switch_mode == "1")
       request->set_boot_mode("Dev");
     else if (dev_switch_mode == "0")
       request->set_boot_mode("Verified");
   }
 }
 
+void DeviceStatusCollector::GetLocation(
+    em::DeviceStatusReportRequest* request) {
+  em::DeviceLocation* location = request->mutable_device_location();
+  if (!position_.Validate()) {
+    location->set_error_code(
+        em::DeviceLocation::ERROR_CODE_POSITION_UNAVAILABLE);
+    location->set_error_message(position_.error_message);
+  } else {
+    location->set_latitude(position_.latitude);
+    location->set_longitude(position_.longitude);
+    location->set_accuracy(position_.accuracy);
+    location->set_timestamp(
+        (position_.timestamp - Time::UnixEpoch()).InMilliseconds());
+    // Lowest point on land is at approximately -400 meters.
+    if (position_.altitude > -10000.)
+      location->set_altitude(position_.altitude);
+    if (position_.altitude_accuracy >= 0.)
+      location->set_altitude_accuracy(position_.altitude_accuracy);
+    if (position_.heading >= 0. && position_.heading <= 360)
+      location->set_heading(position_.heading);
+    if (position_.speed >= 0.)
+      location->set_speed(position_.speed);
+    location->set_error_code(em::DeviceLocation::ERROR_CODE_NONE);
+  }
+}
+
 void DeviceStatusCollector::GetStatus(em::DeviceStatusReportRequest* request) {
   if (report_activity_times_)
     GetActivityTimes(request);
 
   if (report_version_info_)
     GetVersionInfo(request);
 
   if (report_boot_mode_)
     GetBootMode(request);
+
+  if (report_location_)
+    GetLocation(request);
 }
 
 void DeviceStatusCollector::OnOSVersion(VersionLoader::Handle handle,
                                         std::string version) {
   os_version_ = version;
 }
 
 void DeviceStatusCollector::OnOSFirmware(VersionLoader::Handle handle,
                                          std::string version) {
   firmware_version_ = version;
 }
 
 void DeviceStatusCollector::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   if (type == chrome::NOTIFICATION_SYSTEM_SETTING_CHANGED)
     UpdateReportingSettings();
   else
     NOTREACHED();
 }
 
+void DeviceStatusCollector::ScheduleGeolocationUpdateRequest() {
+  if (geolocation_update_timer_.IsRunning() || geolocation_update_in_progress_)
+    return;
+
+  if (position_.Validate()) {
+    base::TimeDelta elapsed = base::Time::Now() - position_.timestamp;
+    base::TimeDelta interval =
+        base::TimeDelta::FromSeconds(kGeolocationPollIntervalSeconds);

[Joao da Silva, 2012/05/03 19:04:08]

nit: drop the base:: in these 3 lines

[bartfab (slow), 2012/05/04 09:14:57]

Done.

+    if (elapsed > interval) {
+      geolocation_update_in_progress_ = true;
+      location_update_requester_(base::Bind(
+          &DeviceStatusCollector::ReceiveGeolocationUpdate,
+          weak_ptr_factory_.GetWeakPtr()));
+    } else {
+      geolocation_update_timer_.Start(
+          FROM_HERE,
+          interval - elapsed,
+          this,
+          &DeviceStatusCollector::ScheduleGeolocationUpdateRequest);
+    }
+  } else {
+    geolocation_update_in_progress_ = true;
+    location_update_requester_(base::Bind(
+        &DeviceStatusCollector::ReceiveGeolocationUpdate,
+        weak_ptr_factory_.GetWeakPtr()));
+
+  }
+}
+
+void DeviceStatusCollector::ReceiveGeolocationUpdate(
+    const content::Geoposition& position) {
+  geolocation_update_in_progress_ = false;
+
+  // Ignore update if device location reporting has since been disabled.
+  if (!report_location_)
+    return;
+
+  if (position.Validate()) {
+    position_ = position;
+    DictionaryValue location;

[Joao da Silva, 2012/05/03 19:04:08]

nit: base::*Value (here and elsewhere)

[bartfab (slow), 2012/05/04 09:14:57]

Done.

+    location.SetDouble("latitude", position.latitude);
+    location.SetDouble("longitude", position.longitude);
+    location.SetDouble("altitude", position.altitude);
+    location.SetDouble("accuracy", position.accuracy);
+    location.SetDouble("altitude_accuracy", position.altitude_accuracy);
+    location.SetDouble("heading", position.heading);
+    location.SetDouble("speed", position.speed);
+    location.SetString("timestamp",
+        base::Int64ToString(position.timestamp.ToInternalValue()));
+    local_state_->Set(prefs::kDeviceLocation, location);
+  }
+
+  ScheduleGeolocationUpdateRequest();
+}
+
 }  // namespace policy