Clear cookies, local storage and databases when an extension gets uninstalled.

BUG=27938
TEST=Unittest in extension_service_unitttest.cc

Review URL: http://codereview.chromium.org/1095003
Patch from Mattias Nissler.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42467 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 62 insertions, 0 deletions

diff --git a/chrome/browser/extensions/extension_data_deleter.h b/chrome/browser/extensions/extension_data_deleter.h
new file mode 100644
index 0000000..a886833
--- /dev/null
+++ b/chrome/browser/extensions/extension_data_deleter.h
@@ -0,0 +1,62 @@
+// Copyright (c) 2010 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_EXTENSIONS_EXTENSION_DATA_DELETER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
+
+#include <string>
+
+#include "base/ref_counted.h"
+#include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/in_process_webkit/webkit_context.h"
+#include "chrome/browser/net/url_request_context_getter.h"
+#include "googleurl/src/gurl.h"
+#include "webkit/database/database_tracker.h"
+
+class Extension;
+class Profile;
+
+// A helper class that takes care of removing local storage, databases and
+// cookies for a given extension. This is used by
+// ExtensionsService::ClearExtensionData() upon uninstalling an extension.
+class ExtensionDataDeleter
+  : public base::RefCountedThreadSafe<ExtensionDataDeleter,
+                                      ChromeThread::DeleteOnUIThread> {
+ public:
+  ExtensionDataDeleter(Profile* profile, const GURL& extension_url);
+
+  // Start removing data. The extension should not be running when this is
+  // called. Cookies are deleted on the current thread, local storage and
+  // databases are deleted asynchronously on the webkit and file threads,
+  // respectively. This function must be called from the UI thread.
+  void StartDeleting();
+
+ private:
+  // Deletes the database for the extension. May only be called on the file
+  // thread.
+  void DeleteDatabaseOnFileThread();
+
+  // Deletes local storage for the extension. May only be called on the webkit
+  // thread.
+  void DeleteLocalStorageOnWebkitThread();
+
+  // The database context for deleting the database.
+  scoped_refptr<webkit_database::DatabaseTracker> database_tracker_;
+
+  // Provides access to the extension request context.
+  scoped_refptr<URLRequestContextGetter> extension_request_context_;
+
+  // The URL of the extension we're removing data for.
+  GURL extension_url_;
+
+  // The security origin identifier for which we're deleting stuff.
+  string16 origin_id_;
+
+  // Webkit context for accessing the DOM storage helper.
+  scoped_refptr<WebKitContext> webkit_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionDataDeleter);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_