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      1 // Copyright (c) 2013 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/power/peripheral_battery_observer.h"
      6 
      7 #include <vector>
      8 
      9 #include "ash/shell.h"
     10 #include "base/bind.h"
     11 #include "base/strings/string16.h"
     12 #include "base/strings/string_split.h"
     13 #include "base/strings/stringprintf.h"
     14 #include "base/strings/utf_string_conversions.h"
     15 #include "chrome/browser/browser_process.h"
     16 #include "chrome/browser/notifications/notification.h"
     17 #include "chrome/browser/notifications/notification_ui_manager.h"
     18 #include "chrome/browser/profiles/profile_manager.h"
     19 #include "chromeos/dbus/dbus_thread_manager.h"
     20 #include "content/public/browser/browser_thread.h"
     21 #include "device/bluetooth/bluetooth_adapter_factory.h"
     22 #include "device/bluetooth/bluetooth_device.h"
     23 #include "grit/ash_strings.h"
     24 #include "grit/theme_resources.h"
     25 #include "ui/base/l10n/l10n_util.h"
     26 #include "ui/base/resource/resource_bundle.h"
     27 #include "ui/gfx/image/image.h"
     28 
     29 namespace chromeos {
     30 
     31 namespace {
     32 
     33 // When a peripheral device's battery level is <= kLowBatteryLevel, consider
     34 // it to be in low battery condition.
     35 const int kLowBatteryLevel = 15;
     36 
     37 // Don't show 2 low battery notification within |kNotificationIntervalSec|
     38 // seconds.
     39 const int kNotificationIntervalSec = 60;
     40 
     41 const char kNotificationOriginUrl[] = "chrome://peripheral-battery";
     42 
     43 // HID Bluetooth device's battery sysfs entry path looks like
     44 // "/sys/class/power_supply/hid-AA:BB:CC:DD:EE:FF-battery".
     45 // Here the bluetooth address is showed in reverse order and its true
     46 // address "FF:EE:DD:CC:BB:AA".
     47 const char kHIDBatteryPathPrefix[] = "/sys/class/power_supply/hid-";
     48 const char kHIDBatteryPathSuffix[] = "-battery";
     49 
     50 bool IsBluetoothHIDBattery(const std::string& path) {
     51   return StartsWithASCII(path, kHIDBatteryPathPrefix, false) &&
     52       EndsWith(path, kHIDBatteryPathSuffix, false);
     53 }
     54 
     55 std::string ExtractBluetoothAddress(const std::string& path) {
     56   int header_size = strlen(kHIDBatteryPathPrefix);
     57   int end_size = strlen(kHIDBatteryPathSuffix);
     58   int key_len = path.size() - header_size - end_size;
     59   if (key_len <= 0)
     60     return std::string();
     61   std::string reverse_address = path.substr(header_size, key_len);
     62   StringToLowerASCII(&reverse_address);
     63   std::vector<std::string> result;
     64   base::SplitString(reverse_address, ':', &result);
     65   std::reverse(result.begin(), result.end());
     66   std::string address = JoinString(result, ':');
     67   return address;
     68 }
     69 
     70 class PeripheralBatteryNotificationDelegate : public NotificationDelegate {
     71  public:
     72   explicit PeripheralBatteryNotificationDelegate(const std::string& id)
     73       : id_(id) {}
     74 
     75   // Overridden from NotificationDelegate:
     76   virtual void Display() OVERRIDE {}
     77   virtual void Error() OVERRIDE {}
     78   virtual void Close(bool by_user) OVERRIDE {}
     79   virtual void Click() OVERRIDE {}
     80   virtual std::string id() const OVERRIDE { return id_; }
     81   // A NULL return value prevents loading image from URL. It is OK since our
     82   // implementation loads image from system resource bundle.
     83   virtual content::WebContents* GetWebContents() const OVERRIDE {
     84     return NULL;
     85   }
     86 
     87  private:
     88   virtual ~PeripheralBatteryNotificationDelegate() {}
     89 
     90   const std::string id_;
     91 
     92   DISALLOW_COPY_AND_ASSIGN(PeripheralBatteryNotificationDelegate);
     93 };
     94 
     95 }  // namespace
     96 
     97 PeripheralBatteryObserver::PeripheralBatteryObserver()
     98     : testing_clock_(NULL),
     99       weakptr_factory_(
    100           new base::WeakPtrFactory<PeripheralBatteryObserver>(this)) {
    101   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
    102   device::BluetoothAdapterFactory::GetAdapter(
    103       base::Bind(&PeripheralBatteryObserver::InitializeOnBluetoothReady,
    104                  weakptr_factory_->GetWeakPtr()));
    105 }
    106 
    107 PeripheralBatteryObserver::~PeripheralBatteryObserver() {
    108   if (bluetooth_adapter_.get())
    109     bluetooth_adapter_->RemoveObserver(this);
    110   DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(this);
    111 }
    112 
    113 void PeripheralBatteryObserver::PeripheralBatteryStatusReceived(
    114     const std::string& path,
    115     const std::string& name,
    116     int level) {
    117   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
    118   std::string address;
    119   if (IsBluetoothHIDBattery(path)) {
    120     // For HID bluetooth device, device address is used as key to index
    121     // BatteryInfo.
    122     address = ExtractBluetoothAddress(path);
    123   } else {
    124     LOG(ERROR) << "Unsupported battery path " << path;
    125     return;
    126   }
    127 
    128   if (address.empty()) {
    129     LOG(ERROR) << "No valid battery address at path " << path;
    130     return;
    131   }
    132 
    133   if (level < -1 || level > 100) {
    134     LOG(ERROR) << "Invalid battery level " << level
    135                << " for device " << name << " at path " << path;
    136     return;
    137   }
    138   // If unknown battery level received, cancel any existing notification.
    139   if (level == -1) {
    140     CancelNotification(address);
    141     return;
    142   }
    143 
    144   // Post the notification in 2 cases:
    145   // 1. It's the first time the battery level is received, and it is
    146   //    below kLowBatteryLevel.
    147   // 2. The battery level is in record and it drops below kLowBatteryLevel.
    148   if (batteries_.find(address) == batteries_.end()) {
    149     BatteryInfo battery(name, level, base::TimeTicks());
    150     if (level <= kLowBatteryLevel) {
    151       if (PostNotification(address, battery))
    152         battery.last_notification_timestamp = testing_clock_ ?
    153             testing_clock_->NowTicks() : base::TimeTicks::Now();
    154     }
    155     batteries_[address] = battery;
    156   } else {
    157     BatteryInfo* battery = &batteries_[address];
    158     battery->name = name;
    159     int old_level = battery->level;
    160     battery->level = level;
    161     if (old_level > kLowBatteryLevel && level <= kLowBatteryLevel) {
    162       if (PostNotification(address, *battery))
    163         battery->last_notification_timestamp = testing_clock_ ?
    164             testing_clock_->NowTicks() : base::TimeTicks::Now();
    165     }
    166   }
    167 }
    168 
    169 void PeripheralBatteryObserver::DeviceChanged(device::BluetoothAdapter* adapter,
    170                                               device::BluetoothDevice* device) {
    171   if (!device->IsPaired())
    172     RemoveBattery(device->GetAddress());
    173 }
    174 
    175 void PeripheralBatteryObserver::DeviceRemoved(device::BluetoothAdapter* adapter,
    176                                               device::BluetoothDevice* device) {
    177   RemoveBattery(device->GetAddress());
    178 }
    179 
    180 void PeripheralBatteryObserver::InitializeOnBluetoothReady(
    181     scoped_refptr<device::BluetoothAdapter> adapter) {
    182   bluetooth_adapter_ = adapter;
    183   CHECK(bluetooth_adapter_.get());
    184   bluetooth_adapter_->AddObserver(this);
    185 }
    186 
    187 void PeripheralBatteryObserver::RemoveBattery(const std::string& address) {
    188   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
    189   std::string address_lowercase = address;
    190   StringToLowerASCII(&address_lowercase);
    191   std::map<std::string, BatteryInfo>::iterator it =
    192       batteries_.find(address_lowercase);
    193   if (it != batteries_.end()) {
    194     batteries_.erase(it);
    195     CancelNotification(address_lowercase);
    196   }
    197 }
    198 
    199 bool PeripheralBatteryObserver::PostNotification(const std::string& address,
    200                                                  const BatteryInfo& battery) {
    201   // Only post notification if kNotificationInterval seconds have passed since
    202   // last notification showed, avoiding the case where the battery level
    203   // oscillates around the threshold level.
    204   base::TimeTicks now = testing_clock_ ? testing_clock_->NowTicks() :
    205       base::TimeTicks::Now();
    206   if (now - battery.last_notification_timestamp <
    207       base::TimeDelta::FromSeconds(kNotificationIntervalSec))
    208     return false;
    209 
    210   NotificationUIManager* notification_manager =
    211       g_browser_process->notification_ui_manager();
    212 
    213   base::string16 string_text = l10n_util::GetStringFUTF16Int(
    214       IDS_ASH_LOW_PERIPHERAL_BATTERY_NOTIFICATION_TEXT,
    215       battery.level);
    216 
    217   Notification notification(
    218       // TODO(mukai): add SYSTEM priority and use here.
    219       GURL(kNotificationOriginUrl),
    220       ui::ResourceBundle::GetSharedInstance().GetImageNamed(
    221           IDR_NOTIFICATION_PERIPHERAL_BATTERY_LOW),
    222       base::UTF8ToUTF16(battery.name),
    223       string_text,
    224       blink::WebTextDirectionDefault,
    225       base::string16(),
    226       base::UTF8ToUTF16(address),
    227       new PeripheralBatteryNotificationDelegate(address));
    228 
    229   notification_manager->Add(
    230       notification,
    231       ProfileManager::GetPrimaryUserProfile());
    232 
    233   return true;
    234 }
    235 
    236 void PeripheralBatteryObserver::CancelNotification(const std::string& address) {
    237   g_browser_process->notification_ui_manager()->CancelById(address);
    238 }
    239 
    240 }  // namespace chromeos
    241