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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef WEBKIT_QUOTA_SPECIAL_STORAGE_POLICY_H_ | |
| 6 #define WEBKIT_QUOTA_SPECIAL_STORAGE_POLICY_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/memory/ref_counted.h" | |
| 11 #include "base/observer_list.h" | |
| 12 #include "webkit/storage/webkit_storage_export.h" | |
| 13 | |
| 14 class GURL; | |
| 15 | |
| 16 namespace quota { | |
| 17 | |
| 18 // Special rights are granted to 'extensions' and 'applications'. The | |
| 19 // storage subsystems query this interface to determine which origins | |
| 20 // have these rights. Chrome provides an impl that is cognizant of what | |
| 21 // is currently installed in the extensions system. | |
| 22 // The IsSomething() methods must be thread-safe, however Observers should | |
| 23 // only be notified, added, and removed on the IO thead. | |
| 24 class WEBKIT_STORAGE_EXPORT SpecialStoragePolicy | |
| 25 : public base::RefCountedThreadSafe<SpecialStoragePolicy> { | |
| 26 public: | |
| 27 typedef int StoragePolicy; | |
| 28 enum ChangeFlags { | |
| 29 STORAGE_PROTECTED = 1 << 0, | |
| 30 STORAGE_UNLIMITED = 1 << 1, | |
| 31 }; | |
| 32 | |
| 33 class WEBKIT_STORAGE_EXPORT Observer { | |
| 34 public: | |
| 35 virtual void OnGranted(const GURL& origin, int change_flags) = 0; | |
| 36 virtual void OnRevoked(const GURL& origin, int change_flags) = 0; | |
| 37 virtual void OnCleared() = 0; | |
| 38 | |
| 39 protected: | |
| 40 virtual ~Observer(); | |
| 41 }; | |
| 42 | |
| 43 SpecialStoragePolicy(); | |
| 44 | |
| 45 // Protected storage is not subject to removal by the browsing data remover. | |
| 46 virtual bool IsStorageProtected(const GURL& origin) = 0; | |
| 47 | |
| 48 // Unlimited storage is not subject to 'quotas'. | |
| 49 virtual bool IsStorageUnlimited(const GURL& origin) = 0; | |
| 50 | |
| 51 // Some origins (e.g. installed apps) have access to the size of the remaining | |
| 52 // disk capacity. | |
| 53 virtual bool CanQueryDiskSize(const GURL& origin) = 0; | |
| 54 | |
| 55 // Checks if extension identified with |extension_id| is registered as | |
| 56 // file handler. | |
| 57 virtual bool IsFileHandler(const std::string& extension_id) = 0; | |
| 58 | |
| 59 // Some origins are only allowed to store session-only data which is deleted | |
| 60 // when the session ends. | |
| 61 virtual bool IsStorageSessionOnly(const GURL& origin) = 0; | |
| 62 | |
| 63 // Returns true if some origins are only allowed session-only storage. | |
| 64 virtual bool HasSessionOnlyOrigins() = 0; | |
| 65 | |
| 66 // Adds/removes an observer, the policy does not take | |
| 67 // ownership of the observer. Should only be called on the IO thread. | |
| 68 void AddObserver(Observer* observer); | |
| 69 void RemoveObserver(Observer* observer); | |
| 70 | |
| 71 protected: | |
| 72 friend class base::RefCountedThreadSafe<SpecialStoragePolicy>; | |
| 73 virtual ~SpecialStoragePolicy(); | |
| 74 void NotifyGranted(const GURL& origin, int change_flags); | |
| 75 void NotifyRevoked(const GURL& origin, int change_flags); | |
| 76 void NotifyCleared(); | |
| 77 | |
| 78 ObserverList<Observer> observers_; | |
| 79 }; | |
| 80 | |
| 81 } // namespace quota | |
| 82 | |
| 83 #endif // WEBKIT_QUOTA_SPECIAL_STORAGE_POLICY_H_ | |
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