Cleaning Up Extensions When Local Content Removed

chrome/browser/extensions/extension_garbage_collector.h

+// Copyright (c) 2012 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_GARBAGE_COLLECTOR_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
+#pragma once
+
+#include <map>
+#include <vector>
+
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+
+class ExtensionService;
+
+// Garbage collection for extensions. This will delete any directories in the
+// installation directory of |extension_service_| that aren't valid, as well
+// as removing any references in the preferences to extensions that are
+// missing local content.
+class ExtensionGarbageCollector
+    : public base::RefCountedThreadSafe<ExtensionGarbageCollector> {
+ public:
+  explicit ExtensionGarbageCollector(ExtensionService* extension_service);
+  virtual ~ExtensionGarbageCollector();
+
+  // Begin garbage collection; fetch the installed extensions' ids.
+  void GarbageCollectExtensions();
+
+ private:
+  // Check for invalid extension directories and for any extensions that are
+  // missing local content.
+  void CheckExtensionDirectories(
+      const std::map<std::string, FilePath>& extension_paths);
+
+  // Check the installation directory for any invalid/unused extension
+  // directories, deleting them if found.
+  void CheckInstalledDirectories(
+      const std::map<std::string, FilePath>& extension_paths);
+
+  // Remove all references to extensions which are missing local content (e.g.
+  // the extension's directory was deleted from the install directory).
+  void RemoveExtensionsMissingLocalContent(
+      const std::vector<std::string>& bad_extensions);
+
+  ExtensionService* extension_service_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_