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// Copyright (c) 2012 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 CHROME_BROWSER_PROTECTOR_PROTECTED_PREFS_WATCHER_H_
#define CHROME_BROWSER_PROTECTOR_PROTECTED_PREFS_WATCHER_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/extensions/extension_prefs.h"
#include "content/public/browser/notification_observer.h"
class PrefService;
class PrefSetObserver;
class Profile;
namespace base {
class Value;
}
namespace protector {
class ProtectedPrefsWatcher : public content::NotificationObserver {
public:
// Current backup version.
static const int kCurrentVersionNumber;
explicit ProtectedPrefsWatcher(Profile* profile);
virtual ~ProtectedPrefsWatcher();
// Registers prefs on a new Profile instance.
static void RegisterUserPrefs(PrefService* prefs);
// Returns true if pref named |path| has changed and the backup is valid.
bool DidPrefChange(const std::string& path) const;
// Returns the backup value for pref named |path| or |NULL| if the pref is not
// protected, does not exist or the backup is invalid. The returned Value
// instance is owned by the PrefService.
const base::Value* GetBackupForPref(const std::string& path) const;
// Forces a valid backup, matching actual preferences (overwriting any
// previous data). Should only be when protector service is disabled.
void ForceUpdateBackup();
// True if the backup was valid at the profile load time.
bool is_backup_valid() { return is_backup_valid_; }
private:
friend class ProtectedPrefsWatcherTest;
// content::NotificationObserver overrides:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Makes sure that all protected prefs have been migrated before starting to
// observe them.
void EnsurePrefsMigration();
// Updates cached prefs from their actual values and returns |true| if there
// were any changes.
bool UpdateCachedPrefs();
// Returns |false| if profile does not have a backup yet (needs to be
// initialized).
bool HasBackup() const;
// Creates initial backup entries.
void InitBackup();
// Migrates backup if it is an older version.
void MigrateOldBackupIfNeeded();
// Updates the backup entry for |path| and returns |true| if the backup has
// changed.
bool UpdateBackupEntry(const std::string& path);
// Perform a check that backup is valid and settings have not been modified.
void ValidateBackup();
// Returns |true| if backup signature is valid.
bool IsSignatureValid() const;
// Updates the backup signature.
void UpdateBackupSignature();
// Returns data to be signed as string.
std::string GetSignatureData(PrefService* prefs) const;
// Cached set of extension IDs. They are not changed as frequently
ExtensionPrefs::ExtensionIdSet cached_extension_ids_;
scoped_ptr<PrefSetObserver> pref_observer_;
// True if the backup was valid at the profile load time.
bool is_backup_valid_;
Profile* profile_;
DISALLOW_COPY_AND_ASSIGN(ProtectedPrefsWatcher);
};
} // namespace protector
#endif // CHROME_BROWSER_PROTECTOR_PROTECTED_PREFS_WATCHER_H_
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