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// Copyright 2013 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.
#ifndef APPS_SAVED_FILES_SERVICE_H_
#define APPS_SAVED_FILES_SERVICE_H_
#include <map>
#include <set>
#include <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "components/keyed_service/core/keyed_service.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Profile;
class SavedFilesServiceUnitTest;
FORWARD_DECLARE_TEST(SavedFilesServiceUnitTest, RetainTwoFilesTest);
FORWARD_DECLARE_TEST(SavedFilesServiceUnitTest, EvictionTest);
FORWARD_DECLARE_TEST(SavedFilesServiceUnitTest, SequenceNumberCompactionTest);
namespace extensions {
class Extension;
}
namespace apps {
// Represents a file entry that a user has given an app permission to
// access. Will be persisted to disk (in the Preferences file), so should remain
// serializable.
struct SavedFileEntry {
SavedFileEntry();
SavedFileEntry(const std::string& id,
const base::FilePath& path,
bool is_directory,
int sequence_number);
// The opaque id of this file entry.
std::string id;
// The path to a file entry that the app had permission to access.
base::FilePath path;
// Whether or not the entry refers to a directory.
bool is_directory;
// The sequence number in the LRU of the file entry. The value 0 indicates
// that the entry is not in the LRU.
int sequence_number;
};
// Tracks the files that apps have retained access to both while running and
// when suspended.
class SavedFilesService : public KeyedService,
public content::NotificationObserver {
public:
explicit SavedFilesService(Profile* profile);
~SavedFilesService() override;
static SavedFilesService* Get(Profile* profile);
// Registers a file entry with the saved files service, making it eligible to
// be put into the queue. File entries that are in the retained files queue at
// object construction are automatically registered.
void RegisterFileEntry(const std::string& extension_id,
const std::string& id,
const base::FilePath& file_path,
bool is_directory);
// If the file with |id| is not in the queue of files to be retained
// permanently, adds the file to the back of the queue, evicting the least
// recently used entry at the front of the queue if it is full. If it is
// already present, moves it to the back of the queue. The |id| must have been
// registered.
void EnqueueFileEntry(const std::string& extension_id, const std::string& id);
// Returns whether the file entry with the given |id| has been registered.
bool IsRegistered(const std::string& extension_id, const std::string& id);
// Gets a borrowed pointer to the file entry with the specified |id|. Returns
// NULL if the file entry has not been registered.
const SavedFileEntry* GetFileEntry(const std::string& extension_id,
const std::string& id);
// Returns all registered file entries.
std::vector<SavedFileEntry> GetAllFileEntries(
const std::string& extension_id);
// Clears all retained files if the app does not have the
// fileSystem.retainEntries permission.
void ClearQueueIfNoRetainPermission(const extensions::Extension* extension);
// Clears all retained files.
void ClearQueue(const extensions::Extension* extension);
private:
FRIEND_TEST_ALL_PREFIXES(::SavedFilesServiceUnitTest, RetainTwoFilesTest);
FRIEND_TEST_ALL_PREFIXES(::SavedFilesServiceUnitTest, EvictionTest);
FRIEND_TEST_ALL_PREFIXES(::SavedFilesServiceUnitTest,
SequenceNumberCompactionTest);
friend class ::SavedFilesServiceUnitTest;
// A container for the registered files for an app.
class SavedFiles;
// content::NotificationObserver.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// Returns the SavedFiles for |extension_id| or NULL if one does not exist.
SavedFiles* Get(const std::string& extension_id) const;
// Returns the SavedFiles for |extension_id|, creating it if necessary.
SavedFiles* GetOrInsert(const std::string& extension_id);
// Clears the SavedFiles for |extension_id|.
void Clear(const std::string& extension_id);
static void SetMaxSequenceNumberForTest(int max_value);
static void ClearMaxSequenceNumberForTest();
static void SetLruSizeForTest(int size);
static void ClearLruSizeForTest();
std::map<std::string, scoped_ptr<SavedFiles>> extension_id_to_saved_files_;
content::NotificationRegistrar registrar_;
Profile* profile_;
DISALLOW_COPY_AND_ASSIGN(SavedFilesService);
};
} // namespace apps
#endif // APPS_SAVED_FILES_SERVICE_H_
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