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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 STORAGE_BROWSER_QUOTA_SPECIAL_STORAGE_POLICY_H_
#define STORAGE_BROWSER_QUOTA_SPECIAL_STORAGE_POLICY_H_
#include <string>
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "storage/browser/storage_browser_export.h"
class GURL;
namespace storage {
// Special rights are granted to 'extensions' and 'applications'. The
// storage subsystems query this interface to determine which origins
// have these rights. Chrome provides an impl that is cognizant of what
// is currently installed in the extensions system.
// The IsSomething() methods must be thread-safe, however Observers should
// only be notified, added, and removed on the IO thead.
class STORAGE_EXPORT SpecialStoragePolicy
: public base::RefCountedThreadSafe<SpecialStoragePolicy> {
public:
typedef int StoragePolicy;
enum ChangeFlags {
STORAGE_PROTECTED = 1 << 0,
STORAGE_UNLIMITED = 1 << 1,
};
class STORAGE_EXPORT Observer {
public:
virtual void OnGranted(const GURL& origin, int change_flags) = 0;
virtual void OnRevoked(const GURL& origin, int change_flags) = 0;
virtual void OnCleared() = 0;
protected:
virtual ~Observer();
};
SpecialStoragePolicy();
// Protected storage is not subject to removal by the browsing data remover.
virtual bool IsStorageProtected(const GURL& origin) = 0;
// Unlimited storage is not subject to quota or storage pressure eviction.
virtual bool IsStorageUnlimited(const GURL& origin) = 0;
// Durable storage is not subject to storage pressure eviction.
virtual bool IsStorageDurable(const GURL& origin) = 0;
// Some origins (e.g. installed apps) have access to the size of the remaining
// disk capacity.
virtual bool CanQueryDiskSize(const GURL& origin) = 0;
// Checks if the origin contains per-site isolated storage.
virtual bool HasIsolatedStorage(const GURL& origin) = 0;
// Some origins are only allowed to store session-only data which is deleted
// when the session ends.
virtual bool IsStorageSessionOnly(const GURL& origin) = 0;
// Returns true if some origins are only allowed session-only storage.
virtual bool HasSessionOnlyOrigins() = 0;
// Adds/removes an observer, the policy does not take
// ownership of the observer. Should only be called on the IO thread.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
protected:
friend class base::RefCountedThreadSafe<SpecialStoragePolicy>;
virtual ~SpecialStoragePolicy();
void NotifyGranted(const GURL& origin, int change_flags);
void NotifyRevoked(const GURL& origin, int change_flags);
void NotifyCleared();
base::ObserverList<Observer> observers_;
};
} // namespace storage
#endif // STORAGE_BROWSER_QUOTA_SPECIAL_STORAGE_POLICY_H_