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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media_galleries/media_file_system_registry.h"
#include <stddef.h>
#include <memory>
#include <set>
#include <utility>
#include <vector>
#include "base/check_op.h"
#include "base/containers/contains.h"
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/singleton.h"
#include "base/memory/weak_ptr.h"
#include "base/notreached.h"
#include "build/build_config.h"
#include "chrome/browser/media_galleries/fileapi/media_file_system_backend.h"
#include "chrome/browser/media_galleries/gallery_watch_manager.h"
#include "chrome/browser/media_galleries/media_file_system_context.h"
#include "chrome/browser/media_galleries/media_galleries_preferences_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "components/keyed_service/content/browser_context_keyed_service_shutdown_notifier_factory.h"
#include "components/storage_monitor/media_storage_util.h"
#include "components/storage_monitor/storage_monitor.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/page_user_data.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "storage/browser/file_system/external_mount_points.h"
#include "storage/common/file_system/file_system_mount_option.h"
#include "storage/common/file_system/file_system_types.h"
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_CHROMEOS)
#include "chrome/browser/media_galleries/fileapi/mtp_device_map_service.h"
#endif
using content::BrowserThread;
using content::NavigationController;
using content::RenderProcessHost;
using content::WebContents;
using storage::ExternalMountPoints;
using storage_monitor::MediaStorageUtil;
using storage_monitor::StorageInfo;
using storage_monitor::StorageMonitor;
namespace {
class MediaFileSystemRegistryShutdownNotifierFactory
: public BrowserContextKeyedServiceShutdownNotifierFactory {
public:
static MediaFileSystemRegistryShutdownNotifierFactory* GetInstance() {
return base::Singleton<
MediaFileSystemRegistryShutdownNotifierFactory>::get();
}
MediaFileSystemRegistryShutdownNotifierFactory(
const MediaFileSystemRegistryShutdownNotifierFactory&) = delete;
MediaFileSystemRegistryShutdownNotifierFactory& operator=(
const MediaFileSystemRegistryShutdownNotifierFactory&) = delete;
private:
friend struct base::DefaultSingletonTraits<
MediaFileSystemRegistryShutdownNotifierFactory>;
MediaFileSystemRegistryShutdownNotifierFactory()
: BrowserContextKeyedServiceShutdownNotifierFactory(
"MediaFileSystemRegistry") {
DependsOn(MediaGalleriesPreferencesFactory::GetInstance());
}
~MediaFileSystemRegistryShutdownNotifierFactory() override = default;
};
struct InvalidatedGalleriesInfo {
std::set<raw_ptr<ExtensionGalleriesHost, SetExperimental>> extension_hosts;
std::set<MediaGalleryPrefId> pref_ids;
};
// Just a convenience class to help scope ExtensionGalleriesHost to the lifetime
// of a content::Page.
class PageAlivenessReference
: public content::PageUserData<PageAlivenessReference> {
public:
// `page_dead_callback` is called when the page is destroyed.
PageAlivenessReference(content::Page& page,
base::OnceClosure page_dead_callback)
: content::PageUserData<PageAlivenessReference>(page),
page_dead_callback_(std::move(page_dead_callback)) {}
~PageAlivenessReference() override { std::move(page_dead_callback_).Run(); }
private:
friend PageUserData;
PAGE_USER_DATA_KEY_DECL();
// Called once the page is dead.
base::OnceClosure page_dead_callback_;
};
PAGE_USER_DATA_KEY_IMPL(PageAlivenessReference);
} // namespace
MediaFileSystemInfo::MediaFileSystemInfo(const std::u16string& fs_name,
const base::FilePath& fs_path,
const std::string& filesystem_id,
MediaGalleryPrefId pref_id,
const std::string& transient_device_id,
bool removable,
bool media_device)
: name(fs_name),
path(fs_path),
fsid(filesystem_id),
pref_id(pref_id),
transient_device_id(transient_device_id),
removable(removable),
media_device(media_device) {}
MediaFileSystemInfo::MediaFileSystemInfo() = default;
MediaFileSystemInfo::MediaFileSystemInfo(const MediaFileSystemInfo& other) =
default;
MediaFileSystemInfo::~MediaFileSystemInfo() = default;
// The main owner of this class is
// |MediaFileSystemRegistry::extension_hosts_map_|, but a callback may
// temporarily hold a reference.
class ExtensionGalleriesHost {
public:
// |no_references_callback| is called when the last WebContents reference
// goes away. WebContents references are added through
// ReferenceFromWebContents().
ExtensionGalleriesHost(MediaFileSystemContext* file_system_context,
const base::FilePath& profile_path,
const std::string& extension_id,
base::OnceClosure no_references_callback)
: file_system_context_(file_system_context),
profile_path_(profile_path),
extension_id_(extension_id),
no_references_callback_(std::move(no_references_callback)) {}
~ExtensionGalleriesHost() {
for (auto& it : pref_id_map_) {
file_system_context_->RevokeFileSystem(it.second.fsid);
}
}
ExtensionGalleriesHost(const ExtensionGalleriesHost&) = delete;
ExtensionGalleriesHost& operator=(const ExtensionGalleriesHost&) = delete;
// For each gallery in the list of permitted |galleries|, checks if the
// device is attached and if so looks up or creates a file system name and
// passes the information needed for the renderer to create those file
// system objects to the |callback|.
void GetMediaFileSystems(const MediaGalleryPrefIdSet& galleries,
const MediaGalleriesPrefInfoMap& galleries_info,
MediaFileSystemsCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Extract all the device ids so we can make sure they are attached.
MediaStorageUtil::DeviceIdSet* device_ids =
new MediaStorageUtil::DeviceIdSet;
for (auto id = galleries.begin(); id != galleries.end(); ++id) {
device_ids->insert(galleries_info.find(*id)->second.device_id);
}
MediaStorageUtil::FilterAttachedDevices(
device_ids,
base::BindOnce(
&ExtensionGalleriesHost::GetMediaFileSystemsForAttachedDevices,
weak_factory_.GetWeakPtr(), base::Owned(device_ids), galleries,
galleries_info, std::move(callback)));
}
// Checks if |gallery| is attached and if so, registers the file system and
// then calls |callback| with the result.
void RegisterMediaFileSystem(
const MediaGalleryPrefInfo& gallery,
base::OnceCallback<void(base::File::Error result)> callback) {
// Extract all the device ids so we can make sure they are attached.
MediaStorageUtil::DeviceIdSet* device_ids =
new MediaStorageUtil::DeviceIdSet;
device_ids->insert(gallery.device_id);
MediaStorageUtil::FilterAttachedDevices(
device_ids,
base::BindOnce(&ExtensionGalleriesHost::RegisterAttachedMediaFileSystem,
weak_factory_.GetWeakPtr(), base::Owned(device_ids),
gallery, std::move(callback)));
}
// Revoke the file system for |id| if this extension has created one for |id|.
void RevokeGalleryByPrefId(MediaGalleryPrefId id) {
auto gallery = pref_id_map_.find(id);
if (gallery == pref_id_map_.end())
return;
file_system_context_->RevokeFileSystem(gallery->second.fsid);
pref_id_map_.erase(gallery);
if (pref_id_map_.empty()) {
CleanUp();
}
}
// Indicate that the passed |contents| will reference the file system ids
// created
// by this class.
void ReferenceFromWebContents(content::WebContents* web_contents) {
referring_page_count_++;
// The count is decremented when the below Page is destroyed.
PageAlivenessReference::CreateForPage(
web_contents->GetPrimaryPage(),
base::BindOnce(&ExtensionGalleriesHost::DecrementReferringPageCount,
weak_factory_.GetWeakPtr()));
}
void DecrementReferringPageCount() {
referring_page_count_--;
if (referring_page_count_ == 0) {
CleanUp();
}
}
private:
typedef std::map<MediaGalleryPrefId, MediaFileSystemInfo> PrefIdFsInfoMap;
void GetMediaFileSystemsForAttachedDevices(
const MediaStorageUtil::DeviceIdSet* attached_devices,
const MediaGalleryPrefIdSet& galleries,
const MediaGalleriesPrefInfoMap& galleries_info,
MediaFileSystemsCallback callback) {
std::vector<MediaFileSystemInfo> result;
for (auto pref_id_it = galleries.begin(); pref_id_it != galleries.end();
++pref_id_it) {
const MediaGalleryPrefId& pref_id = *pref_id_it;
const MediaGalleryPrefInfo& gallery_info =
galleries_info.find(pref_id)->second;
const std::string& device_id = gallery_info.device_id;
if (!base::Contains(*attached_devices, device_id))
continue;
PrefIdFsInfoMap::const_iterator existing_info =
pref_id_map_.find(pref_id);
if (existing_info != pref_id_map_.end()) {
result.push_back(existing_info->second);
continue;
}
base::FilePath path = gallery_info.AbsolutePath();
if (!MediaStorageUtil::CanCreateFileSystem(device_id, path))
continue;
std::string fs_name = MediaFileSystemBackend::ConstructMountName(
profile_path_, extension_id_, pref_id);
if (!file_system_context_->RegisterFileSystem(device_id, fs_name, path))
continue;
MediaFileSystemInfo new_entry(
gallery_info.GetGalleryDisplayName(),
file_system_context_->GetRegisteredPath(fs_name),
fs_name,
pref_id,
GetTransientIdForRemovableDeviceId(device_id),
StorageInfo::IsRemovableDevice(device_id),
StorageInfo::IsMediaDevice(device_id));
result.push_back(new_entry);
pref_id_map_[pref_id] = new_entry;
}
if (result.empty()) {
CleanUp();
}
DCHECK_EQ(pref_id_map_.size(), result.size());
std::move(callback).Run(result);
}
void RegisterAttachedMediaFileSystem(
const MediaStorageUtil::DeviceIdSet* attached_device,
const MediaGalleryPrefInfo& gallery,
base::OnceCallback<void(base::File::Error result)> callback) {
base::File::Error result = base::File::FILE_ERROR_NOT_FOUND;
if (!attached_device->empty()) {
std::string fs_name = MediaFileSystemBackend::ConstructMountName(
profile_path_, extension_id_, gallery.pref_id);
base::FilePath path = gallery.AbsolutePath();
const std::string& device_id = gallery.device_id;
if (base::Contains(pref_id_map_, gallery.pref_id)) {
result = base::File::FILE_OK;
} else if (MediaStorageUtil::CanCreateFileSystem(device_id, path) &&
file_system_context_->RegisterFileSystem(device_id, fs_name,
path)) {
result = base::File::FILE_OK;
pref_id_map_[gallery.pref_id] = MediaFileSystemInfo(
gallery.GetGalleryDisplayName(),
file_system_context_->GetRegisteredPath(fs_name),
fs_name,
gallery.pref_id,
GetTransientIdForRemovableDeviceId(device_id),
StorageInfo::IsRemovableDevice(device_id),
StorageInfo::IsMediaDevice(device_id));
}
}
if (pref_id_map_.empty()) {
CleanUp();
}
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), result));
}
std::string GetTransientIdForRemovableDeviceId(const std::string& device_id) {
if (!StorageInfo::IsRemovableDevice(device_id))
return std::string();
return StorageMonitor::GetInstance()->GetTransientIdForDeviceId(device_id);
}
void CleanUp() {
// This causes the owner of this class to destroy this object. The revoking
// of our filesystems occurs in the destructor. It's written that way
// because sometimes the Profile Shutdown can ALSO cause object destruction.
std::move(no_references_callback_).Run();
}
// MediaFileSystemRegistry owns |this| and |file_system_context_|, so it's
// safe to store a raw pointer.
raw_ptr<MediaFileSystemContext> file_system_context_;
// Path for the active profile.
const base::FilePath profile_path_;
// Id of the extension this host belongs to.
const extensions::ExtensionId extension_id_;
// A callback to call when the last WebContents reference goes away.
base::OnceClosure no_references_callback_;
// A map from the gallery preferences id to the file system information.
PrefIdFsInfoMap pref_id_map_;
// The number of living content::Page instances that are interested in this
// combination of Profile and `extension_id`.
size_t referring_page_count_ = 0U;
// Don't let callbacks extend our lifetime, as that makes things complicated.
base::WeakPtrFactory<ExtensionGalleriesHost> weak_factory_{this};
};
/******************
* Public methods
******************/
void MediaFileSystemRegistry::GetMediaFileSystemsForExtension(
content::WebContents* contents,
const extensions::Extension* extension,
MediaFileSystemsCallback callback) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
Profile* profile = Profile::FromBrowserContext(contents->GetBrowserContext());
MediaGalleriesPreferences* preferences = GetPreferences(profile);
MediaGalleryPrefIdSet galleries =
preferences->GalleriesForExtension(*extension);
if (galleries.empty()) {
std::move(callback).Run(std::vector<MediaFileSystemInfo>());
return;
}
ExtensionGalleriesHost* extension_host =
GetExtensionGalleryHost(profile, preferences, extension->id());
// This must come before the GetMediaFileSystems call to make sure the
// contents of the context is referenced before the filesystems are retrieved.
extension_host->ReferenceFromWebContents(contents);
extension_host->GetMediaFileSystems(galleries, preferences->known_galleries(),
std::move(callback));
}
void MediaFileSystemRegistry::RegisterMediaFileSystemForExtension(
content::WebContents* contents,
const extensions::Extension* extension,
MediaGalleryPrefId pref_id,
base::OnceCallback<void(base::File::Error result)> callback) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_NE(kInvalidMediaGalleryPrefId, pref_id);
Profile* profile = Profile::FromBrowserContext(contents->GetBrowserContext());
MediaGalleriesPreferences* preferences = GetPreferences(profile);
auto gallery = preferences->known_galleries().find(pref_id);
MediaGalleryPrefIdSet permitted_galleries =
preferences->GalleriesForExtension(*extension);
if (gallery == preferences->known_galleries().end() ||
!base::Contains(permitted_galleries, pref_id)) {
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(std::move(callback), base::File::FILE_ERROR_NOT_FOUND));
return;
}
ExtensionGalleriesHost* extension_host =
GetExtensionGalleryHost(profile, preferences, extension->id());
// This must come before the GetMediaFileSystems call to make sure the
// contents of the context is referenced before the filesystems are retrieved.
extension_host->ReferenceFromWebContents(contents);
extension_host->RegisterMediaFileSystem(gallery->second, std::move(callback));
}
MediaGalleriesPreferences* MediaFileSystemRegistry::GetPreferences(
Profile* profile) {
// Create an empty ExtensionHostMap for this profile on first initialization.
if (!base::Contains(extension_hosts_map_, profile)) {
extension_hosts_map_[profile] = ExtensionHostMap();
DCHECK(!base::Contains(profile_subscription_map_, profile));
profile_subscription_map_[profile] =
MediaFileSystemRegistryShutdownNotifierFactory::GetInstance()
->Get(profile)
->Subscribe(
base::BindRepeating(&MediaFileSystemRegistry::OnProfileShutdown,
base::Unretained(this), profile));
}
return MediaGalleriesPreferencesFactory::GetForProfile(profile);
}
GalleryWatchManager* MediaFileSystemRegistry::gallery_watch_manager() {
if (!gallery_watch_manager_)
gallery_watch_manager_ = std::make_unique<GalleryWatchManager>();
return gallery_watch_manager_.get();
}
void MediaFileSystemRegistry::OnRemovableStorageDetached(
const StorageInfo& info) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Since revoking a gallery in the ExtensionGalleriesHost may cause it
// to be removed from the map and therefore invalidate any iterator pointing
// to it, this code first copies all the invalid gallery ids and the
// extension hosts in which they may appear (per profile) and revoked it in
// a second step.
std::vector<InvalidatedGalleriesInfo> invalid_galleries_info;
for (auto profile_it = extension_hosts_map_.begin();
profile_it != extension_hosts_map_.end(); ++profile_it) {
MediaGalleriesPreferences* preferences = GetPreferences(profile_it->first);
// If |preferences| is not yet initialized, it won't contain any galleries.
if (!preferences->IsInitialized())
continue;
InvalidatedGalleriesInfo invalid_galleries_in_profile;
invalid_galleries_in_profile.pref_ids =
preferences->LookUpGalleriesByDeviceId(info.device_id());
for (ExtensionHostMap::const_iterator extension_host_it =
profile_it->second.begin();
extension_host_it != profile_it->second.end();
++extension_host_it) {
invalid_galleries_in_profile.extension_hosts.insert(
extension_host_it->second.get());
}
invalid_galleries_info.push_back(invalid_galleries_in_profile);
}
for (size_t i = 0; i < invalid_galleries_info.size(); i++) {
for (auto extension_host_it =
invalid_galleries_info[i].extension_hosts.begin();
extension_host_it != invalid_galleries_info[i].extension_hosts.end();
++extension_host_it) {
for (auto pref_id_it = invalid_galleries_info[i].pref_ids.begin();
pref_id_it != invalid_galleries_info[i].pref_ids.end();
++pref_id_it) {
(*extension_host_it)->RevokeGalleryByPrefId(*pref_id_it);
}
}
}
}
/******************
* Private methods
******************/
class MediaFileSystemRegistry::MediaFileSystemContextImpl
: public MediaFileSystemContext {
public:
MediaFileSystemContextImpl() = default;
MediaFileSystemContextImpl(const MediaFileSystemContextImpl&) = delete;
MediaFileSystemContextImpl& operator=(const MediaFileSystemContextImpl&) =
delete;
~MediaFileSystemContextImpl() override = default;
bool RegisterFileSystem(const std::string& device_id,
const std::string& fs_name,
const base::FilePath& path) override {
if (StorageInfo::IsMassStorageDevice(device_id))
return RegisterFileSystemForMassStorage(device_id, fs_name, path);
return RegisterFileSystemForMTPDevice(device_id, fs_name, path);
}
void RevokeFileSystem(const std::string& fs_name) override {
ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(fs_name);
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_CHROMEOS)
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&MTPDeviceMapService::RevokeMTPFileSystem,
base::Unretained(MTPDeviceMapService::GetInstance()),
fs_name));
#endif
}
base::FilePath GetRegisteredPath(const std::string& fs_name) const override {
base::FilePath result;
if (!ExternalMountPoints::GetSystemInstance()->GetRegisteredPath(fs_name,
&result)) {
return base::FilePath();
}
return result;
}
private:
// Registers and returns the file system id for the mass storage device
// specified by |device_id| and |path|.
bool RegisterFileSystemForMassStorage(const std::string& device_id,
const std::string& fs_name,
const base::FilePath& path) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(StorageInfo::IsMassStorageDevice(device_id));
// Sanity checks for |path|.
CHECK(path.IsAbsolute());
CHECK(!path.ReferencesParent());
return ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
fs_name, storage::kFileSystemTypeLocalMedia,
storage::FileSystemMountOption(), path);
}
bool RegisterFileSystemForMTPDevice(const std::string& device_id,
const std::string fs_name,
const base::FilePath& path) {
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_CHROMEOS)
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(!StorageInfo::IsMassStorageDevice(device_id));
// Sanity checks for |path|.
CHECK(MediaStorageUtil::CanCreateFileSystem(device_id, path));
bool result = ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
fs_name,
storage::kFileSystemTypeDeviceMedia,
storage::FileSystemMountOption(),
path);
CHECK(result);
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&MTPDeviceMapService::RegisterMTPFileSystem,
base::Unretained(MTPDeviceMapService::GetInstance()),
path.value(), fs_name, true /* read only */));
return result;
#else
NOTREACHED();
#endif
}
};
// Constructor in 'private' section because depends on private class definition.
MediaFileSystemRegistry::MediaFileSystemRegistry()
: file_system_context_(new MediaFileSystemContextImpl) {
StorageMonitor::GetInstance()->AddObserver(this);
}
MediaFileSystemRegistry::~MediaFileSystemRegistry() {
DCHECK(StorageMonitor::GetInstance());
StorageMonitor::GetInstance()->RemoveObserver(this);
}
void MediaFileSystemRegistry::OnPermissionRemoved(
MediaGalleriesPreferences* prefs,
const std::string& extension_id,
MediaGalleryPrefId pref_id) {
Profile* profile = prefs->profile();
ExtensionGalleriesHostMap::const_iterator host_map_it =
extension_hosts_map_.find(profile);
CHECK(host_map_it != extension_hosts_map_.end());
const ExtensionHostMap& extension_host_map = host_map_it->second;
auto gallery_host_it = extension_host_map.find(extension_id);
if (gallery_host_it == extension_host_map.end())
return;
gallery_host_it->second->RevokeGalleryByPrefId(pref_id);
}
void MediaFileSystemRegistry::OnGalleryRemoved(
MediaGalleriesPreferences* prefs,
MediaGalleryPrefId pref_id) {
Profile* profile = prefs->profile();
// Get the Extensions, MediaGalleriesPreferences and ExtensionHostMap for
// |profile|.
const extensions::ExtensionRegistry* extension_registry =
extensions::ExtensionRegistry::Get(profile);
ExtensionGalleriesHostMap::const_iterator host_map_it =
extension_hosts_map_.find(profile);
CHECK(host_map_it != extension_hosts_map_.end());
const ExtensionHostMap& extension_host_map = host_map_it->second;
// Go through ExtensionHosts, and remove indicated gallery, if any.
// RevokeGalleryByPrefId() may end up deleting from |extension_host_map| and
// even delete |extension_host_map| altogether. So do this in two loops to
// avoid using an invalidated iterator or deleted map.
std::vector<const extensions::Extension*> extensions;
for (auto it = extension_host_map.begin(); it != extension_host_map.end();
++it) {
extensions.push_back(
extension_registry->enabled_extensions().GetByID(it->first));
}
for (size_t i = 0; i < extensions.size(); ++i) {
if (!base::Contains(extension_hosts_map_, profile))
break;
auto gallery_host_it = extension_host_map.find(extensions[i]->id());
if (gallery_host_it == extension_host_map.end())
continue;
gallery_host_it->second->RevokeGalleryByPrefId(pref_id);
}
}
ExtensionGalleriesHost* MediaFileSystemRegistry::GetExtensionGalleryHost(
Profile* profile,
MediaGalleriesPreferences* preferences,
const std::string& extension_id) {
auto extension_hosts = extension_hosts_map_.find(profile);
// GetPreferences(), which had to be called because preferences is an
// argument, ensures that profile is in the map.
CHECK(extension_hosts != extension_hosts_map_.end());
if (extension_hosts->second.empty())
preferences->AddGalleryChangeObserver(this);
auto it = extension_hosts->second.find(extension_id);
if (it != extension_hosts->second.end()) {
return it->second.get();
}
auto new_host = std::make_unique<ExtensionGalleriesHost>(
file_system_context_.get(), profile->GetPath(), extension_id,
base::BindOnce(&MediaFileSystemRegistry::OnExtensionGalleriesHostEmpty,
base::Unretained(this), profile, extension_id));
// Save a raw pointer to the newly created host so we can return it.
auto* result = new_host.get();
extension_hosts->second[extension_id] = std::move(new_host);
return result;
}
void MediaFileSystemRegistry::OnExtensionGalleriesHostEmpty(
Profile* profile, const std::string& extension_id) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
auto extension_hosts = extension_hosts_map_.find(profile);
CHECK(extension_hosts != extension_hosts_map_.end());
ExtensionHostMap::size_type erase_count =
extension_hosts->second.erase(extension_id);
DCHECK_EQ(1U, erase_count);
if (extension_hosts->second.empty()) {
// When a profile has no ExtensionGalleriesHosts left, remove the
// matching gallery-change-watcher since it is no longer needed. Leave the
// |extension_hosts| entry alone, since it indicates the profile has been
// previously used.
MediaGalleriesPreferences* preferences = GetPreferences(profile);
preferences->RemoveGalleryChangeObserver(this);
}
}
void MediaFileSystemRegistry::OnProfileShutdown(Profile* profile) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
auto extension_hosts_it = extension_hosts_map_.find(profile);
CHECK(extension_hosts_it != extension_hosts_map_.end());
extension_hosts_map_.erase(extension_hosts_it);
auto profile_subscription_it = profile_subscription_map_.find(profile);
CHECK(profile_subscription_it != profile_subscription_map_.end());
profile_subscription_map_.erase(profile_subscription_it);
}
// static
BrowserContextKeyedServiceShutdownNotifierFactory*
MediaFileSystemRegistry::GetFactoryInstance() {
return MediaFileSystemRegistryShutdownNotifierFactory::GetInstance();
}
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