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      1 // Copyright 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/extensions/api/signed_in_devices/signed_in_devices_manager.h"
      6 
      7 #include <string>
      8 #include <vector>
      9 
     10 #include "base/lazy_instance.h"
     11 #include "base/memory/linked_ptr.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "base/memory/scoped_vector.h"
     14 #include "base/values.h"
     15 #include "chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api.h"
     16 #include "chrome/browser/extensions/extension_service.h"
     17 #include "chrome/browser/profiles/profile.h"
     18 #include "chrome/browser/sync/glue/device_info.h"
     19 #include "chrome/browser/sync/profile_sync_service.h"
     20 #include "chrome/browser/sync/profile_sync_service_factory.h"
     21 #include "chrome/common/extensions/api/signed_in_devices.h"
     22 #include "extensions/browser/event_router.h"
     23 #include "extensions/browser/extension_registry.h"
     24 #include "extensions/common/extension.h"
     25 
     26 using browser_sync::DeviceInfo;
     27 namespace extensions {
     28 
     29 namespace {
     30 void FillDeviceInfo(const DeviceInfo& device_info,
     31                     api::signed_in_devices::DeviceInfo* api_device_info) {
     32   api_device_info->id = device_info.public_id();
     33   api_device_info->name = device_info.client_name();
     34   api_device_info->os = api::signed_in_devices::ParseOS(
     35       device_info.GetOSString());
     36   api_device_info->type = api::signed_in_devices::ParseDeviceType(
     37       device_info.GetDeviceTypeString());
     38   api_device_info->chrome_version = device_info.chrome_version();
     39 }
     40 }  // namespace
     41 
     42 SignedInDevicesChangeObserver::SignedInDevicesChangeObserver(
     43     const std::string& extension_id,
     44     Profile* profile) : extension_id_(extension_id),
     45                         profile_(profile) {
     46   ProfileSyncService* pss = ProfileSyncServiceFactory::GetForProfile(profile_);
     47   if (pss) {
     48     pss->AddObserverForDeviceInfoChange(this);
     49   }
     50 }
     51 
     52 SignedInDevicesChangeObserver::~SignedInDevicesChangeObserver() {
     53   ProfileSyncService* pss = ProfileSyncServiceFactory::GetForProfile(profile_);
     54   if (pss) {
     55     pss->RemoveObserverForDeviceInfoChange(this);
     56   }
     57 
     58 }
     59 
     60 void SignedInDevicesChangeObserver::OnDeviceInfoChange() {
     61   // There is a change in the list of devices. Get all devices and send them to
     62   // the listener.
     63   ScopedVector<DeviceInfo> devices = GetAllSignedInDevices(extension_id_,
     64                                                            profile_);
     65 
     66   std::vector<linked_ptr<api::signed_in_devices::DeviceInfo> > args;
     67 
     68   for (ScopedVector<DeviceInfo>::const_iterator it = devices.begin();
     69        it != devices.end();
     70        ++it) {
     71     linked_ptr<api::signed_in_devices::DeviceInfo> api_device =
     72         make_linked_ptr(new api::signed_in_devices::DeviceInfo);
     73     FillDeviceInfo(*(*it), api_device.get());
     74     args.push_back(api_device);
     75   }
     76 
     77   scoped_ptr<base::ListValue> result =
     78       api::signed_in_devices::OnDeviceInfoChange::Create(args);
     79   scoped_ptr<Event> event(new Event(
     80       api::signed_in_devices::OnDeviceInfoChange::kEventName,
     81       result.Pass()));
     82 
     83   event->restrict_to_browser_context = profile_;
     84 
     85   EventRouter::Get(profile_)->DispatchEventToExtension(
     86       extension_id_, event.Pass());
     87 }
     88 
     89 static base::LazyInstance<
     90     BrowserContextKeyedAPIFactory<SignedInDevicesManager> > g_factory =
     91     LAZY_INSTANCE_INITIALIZER;
     92 
     93 // static
     94 BrowserContextKeyedAPIFactory<SignedInDevicesManager>*
     95 SignedInDevicesManager::GetFactoryInstance() {
     96   return g_factory.Pointer();
     97 }
     98 
     99 SignedInDevicesManager::SignedInDevicesManager()
    100     : profile_(NULL), extension_registry_observer_(this) {
    101 }
    102 
    103 SignedInDevicesManager::SignedInDevicesManager(content::BrowserContext* context)
    104     : profile_(Profile::FromBrowserContext(context)),
    105       extension_registry_observer_(this) {
    106   extensions::EventRouter* router = extensions::EventRouter::Get(profile_);
    107   if (router) {
    108     router->RegisterObserver(
    109         this, api::signed_in_devices::OnDeviceInfoChange::kEventName);
    110   }
    111 
    112   // Register for unload event so we could clear all our listeners when
    113   // extensions have unloaded.
    114   extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
    115 }
    116 
    117 SignedInDevicesManager::~SignedInDevicesManager() {}
    118 
    119 void SignedInDevicesManager::OnListenerAdded(
    120     const EventListenerInfo& details) {
    121   for (ScopedVector<SignedInDevicesChangeObserver>::const_iterator it =
    122            change_observers_.begin();
    123            it != change_observers_.end();
    124            ++it) {
    125     if ((*it)->extension_id() == details.extension_id) {
    126       DCHECK(false) <<"OnListenerAded fired twice for same extension";
    127       return;
    128     }
    129   }
    130 
    131   change_observers_.push_back(new SignedInDevicesChangeObserver(
    132       details.extension_id,
    133       profile_));
    134 }
    135 
    136 void SignedInDevicesManager::OnListenerRemoved(
    137     const EventListenerInfo& details) {
    138   RemoveChangeObserverForExtension(details.extension_id);
    139 }
    140 
    141 void SignedInDevicesManager::RemoveChangeObserverForExtension(
    142     const std::string& extension_id) {
    143   for (ScopedVector<SignedInDevicesChangeObserver>::iterator it =
    144            change_observers_.begin();
    145            it != change_observers_.end();
    146            ++it) {
    147     if ((*it)->extension_id() == extension_id) {
    148       change_observers_.erase(it);
    149       return;
    150     }
    151   }
    152 }
    153 
    154 void SignedInDevicesManager::OnExtensionUnloaded(
    155     content::BrowserContext* browser_context,
    156     const Extension* extension,
    157     UnloadedExtensionInfo::Reason reason) {
    158   RemoveChangeObserverForExtension(extension->id());
    159 }
    160 
    161 }  // namespace extensions
    162