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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/fileapi/mtp_device_map_service.h"
#include <string>
#include <utility>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
#include "content/public/browser/browser_thread.h"
#include "storage/browser/file_system/external_mount_points.h"
#include "storage/browser/file_system/file_system_url.h"
namespace {
base::LazyInstance<MTPDeviceMapService>::DestructorAtExit
g_mtp_device_map_service = LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
MTPDeviceMapService* MTPDeviceMapService::GetInstance() {
return g_mtp_device_map_service.Pointer();
}
void MTPDeviceMapService::RegisterMTPFileSystem(
const base::FilePath::StringType& device_location,
const std::string& filesystem_id,
const bool read_only) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!device_location.empty());
DCHECK(!filesystem_id.empty());
const AsyncDelegateKey key = GetAsyncDelegateKey(device_location, read_only);
if (!base::Contains(mtp_device_usage_map_, key)) {
// Note that this initializes the delegate asynchronously, but since
// the delegate will only be used from the IO thread, it is guaranteed
// to be created before use of it expects it to be there.
CreateMTPDeviceAsyncDelegate(
device_location, read_only,
base::BindOnce(&MTPDeviceMapService::AddAsyncDelegate,
base::Unretained(this), device_location, read_only));
mtp_device_usage_map_[key] = 0;
}
mtp_device_usage_map_[key]++;
mtp_device_map_[filesystem_id] = make_pair(device_location, read_only);
}
void MTPDeviceMapService::RevokeMTPFileSystem(
const std::string& filesystem_id) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!filesystem_id.empty());
MTPDeviceFileSystemMap::iterator it = mtp_device_map_.find(filesystem_id);
if (it != mtp_device_map_.end()) {
const base::FilePath::StringType device_location = it->second.first;
const bool read_only = it->second.second;
mtp_device_map_.erase(it);
const AsyncDelegateKey key =
GetAsyncDelegateKey(device_location, read_only);
MTPDeviceUsageMap::iterator delegate_it = mtp_device_usage_map_.find(key);
CHECK(delegate_it != mtp_device_usage_map_.end());
mtp_device_usage_map_[key]--;
if (mtp_device_usage_map_[key] == 0) {
mtp_device_usage_map_.erase(delegate_it);
RemoveAsyncDelegate(device_location, read_only);
}
}
}
void MTPDeviceMapService::AddAsyncDelegate(
const base::FilePath::StringType& device_location,
const bool read_only,
MTPDeviceAsyncDelegate* delegate) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(delegate);
DCHECK(!device_location.empty());
const AsyncDelegateKey key = GetAsyncDelegateKey(device_location, read_only);
if (base::Contains(async_delegate_map_, key))
return;
async_delegate_map_[key] = delegate;
}
void MTPDeviceMapService::RemoveAsyncDelegate(
const base::FilePath::StringType& device_location,
const bool read_only) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!device_location.empty());
const AsyncDelegateKey key = GetAsyncDelegateKey(device_location, read_only);
AsyncDelegateMap::iterator it = async_delegate_map_.find(key);
CHECK(it != async_delegate_map_.end());
it->second->CancelPendingTasksAndDeleteDelegate();
async_delegate_map_.erase(it);
}
// static
MTPDeviceMapService::AsyncDelegateKey MTPDeviceMapService::GetAsyncDelegateKey(
const base::FilePath::StringType& device_location,
const bool read_only) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
base::FilePath::StringType key;
key.append(read_only ? FILE_PATH_LITERAL("ReadOnly")
: FILE_PATH_LITERAL("ReadWrite"));
key.append(FILE_PATH_LITERAL("|"));
key.append(device_location);
return key;
}
MTPDeviceAsyncDelegate* MTPDeviceMapService::GetMTPDeviceAsyncDelegate(
const storage::FileSystemURL& filesystem_url) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
DCHECK(!filesystem_url.filesystem_id().empty());
const std::string& filesystem_id = filesystem_url.filesystem_id();
// File system may be already revoked on ExternalMountPoints side, we check
// here that the file system is still valid.
base::FilePath device_path;
if (!storage::ExternalMountPoints::GetSystemInstance()->GetRegisteredPath(
filesystem_id, &device_path)) {
return nullptr;
}
const base::FilePath::StringType& device_location = device_path.value();
MTPDeviceFileSystemMap::const_iterator mtp_device_map_it =
mtp_device_map_.find(filesystem_id);
if (mtp_device_map_it == mtp_device_map_.end())
return nullptr;
DCHECK_EQ(device_path.value(), mtp_device_map_it->second.first);
const bool read_only = mtp_device_map_it->second.second;
const AsyncDelegateKey key = GetAsyncDelegateKey(device_location, read_only);
AsyncDelegateMap::const_iterator async_delegate_map_it =
async_delegate_map_.find(key);
return (async_delegate_map_it != async_delegate_map_.end())
? async_delegate_map_it->second
: NULL;
}
MTPDeviceMapService::MTPDeviceMapService() = default;
MTPDeviceMapService::~MTPDeviceMapService() {
DCHECK(mtp_device_usage_map_.empty());
}
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