1 // Copyright 2014 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 CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_ 6 #define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_ 7 8 #include <string> 9 10 #include "base/callback_forward.h" 11 #include "base/files/file_path.h" 12 13 namespace extensions { 14 15 // ExtensionCache interface that caches extensions .crx files to share them 16 // between multiple users and profiles on the machine. 17 class ExtensionCache { 18 public: 19 // Return global singleton instance of ExtensionCache. 20 static ExtensionCache* GetInstance(); 21 22 // Callback that is invoked when the file placed when PutExtension done. 23 typedef base::Callback<void(const base::FilePath& file_path, 24 bool file_ownership_passed)> PutExtensionCallback; 25 26 // Initialize cache in background. The |callback| is called when cache ready. 27 // Can be called multiple times. The |callback| can be called immediately if 28 // cache is ready. 29 virtual void Start(const base::Closure& callback) = 0; 30 31 // Shut down the cache. Must be called at most once on browser shutdown. 32 virtual void Shutdown(const base::Closure& callback) = 0; 33 34 // Allow caching for the extension with given |id|. User specific extensions 35 // should not be cached for privacy reasons. But default apps including policy 36 // configured can be cached. Can be called before Init. 37 virtual void AllowCaching(const std::string& id) = 0; 38 39 // If extension with |id| exists in the cache, returns |true|, |file_path| and 40 // |version| for the extension. Extension will be marked as used with current 41 // timestamp. 42 virtual bool GetExtension(const std::string& id, 43 base::FilePath* file_path, 44 std::string* version) = 0; 45 46 // Put extension with |id| and |version| into local cache. Older version in 47 // the cache will removed be on next run so it can be safely used. Extension 48 // will be marked as used with current timestamp. The file will be available 49 // via GetExtension when |callback| is called. Original |file_path| won't be 50 // deleted from the disk. There is no guarantee that |callback| will be 51 // called. 52 virtual void PutExtension(const std::string& id, 53 const base::FilePath& file_path, 54 const std::string& version, 55 const PutExtensionCallback& callback) = 0; 56 57 protected: 58 virtual ~ExtensionCache() {} 59 60 // Sets the singleton to the given |cache|. Returns the previous value of 61 // the singleton. Ownership is not transferred. 62 static ExtensionCache* SetForTesting(ExtensionCache* cache); 63 }; 64 65 } // namespace extensions 66 67 #endif // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_H_ 68
