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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 CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
      7 #pragma once
      8 
      9 #include "base/memory/ref_counted.h"
     10 #include "base/string16.h"
     11 #include "content/browser/browser_thread.h"
     12 #include "googleurl/src/gurl.h"
     13 
     14 namespace webkit_database {
     15 class DatabaseTracker;
     16 }
     17 
     18 namespace fileapi {
     19 class FileSystemContext;
     20 }
     21 
     22 class Profile;
     23 class WebKitContext;
     24 
     25 namespace net {
     26 class URLRequestContextGetter;
     27 }
     28 
     29 // A helper class that takes care of removing local storage, databases and
     30 // cookies for a given extension. This is used by
     31 // ExtensionService::ClearExtensionData() upon uninstalling an extension.
     32 class ExtensionDataDeleter
     33   : public base::RefCountedThreadSafe<ExtensionDataDeleter,
     34                                       BrowserThread::DeleteOnUIThread> {
     35  public:
     36   ExtensionDataDeleter(Profile* profile, const GURL& extension_url);
     37 
     38   // Start removing data. The extension should not be running when this is
     39   // called. Cookies are deleted on the current thread, local storage and
     40   // databases are deleted asynchronously on the webkit and file threads,
     41   // respectively. This function must be called from the UI thread.
     42   void StartDeleting();
     43 
     44  private:
     45   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
     46   friend class DeleteTask<ExtensionDataDeleter>;
     47 
     48   ~ExtensionDataDeleter();
     49 
     50   // Deletes the cookies for the extension. May only be called on the io
     51   // thread.
     52   void DeleteCookiesOnIOThread();
     53 
     54   // Deletes the database for the extension. May only be called on the file
     55   // thread.
     56   void DeleteDatabaseOnFileThread();
     57 
     58   // Deletes local storage for the extension. May only be called on the webkit
     59   // thread.
     60   void DeleteLocalStorageOnWebkitThread();
     61 
     62   // Deletes indexed db files for the extension. May only be called on the
     63   // webkit thread.
     64   void DeleteIndexedDBOnWebkitThread();
     65 
     66   // Deletes filesystem files for the extension. May only be called on the
     67   // file thread.
     68   void DeleteFileSystemOnFileThread();
     69 
     70   // The database context for deleting the database.
     71   scoped_refptr<webkit_database::DatabaseTracker> database_tracker_;
     72 
     73   // Provides access to the extension request context.
     74   scoped_refptr<net::URLRequestContextGetter> extension_request_context_;
     75 
     76   // The URL of the extension we're removing data for.
     77   GURL extension_url_;
     78 
     79   // The security origin identifier for which we're deleting stuff.
     80   string16 origin_id_;
     81 
     82   // Webkit context for accessing the DOM storage helper.
     83   scoped_refptr<WebKitContext> webkit_context_;
     84 
     85   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
     86 
     87   DISALLOW_COPY_AND_ASSIGN(ExtensionDataDeleter);
     88 };
     89 
     90 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
     91