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// Copyright 2014 The Chromium Authors
// 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_
#include <map>
#include <string>
#include "base/files/file_path.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/extensions/install_observer.h"
#include "components/keyed_service/core/keyed_service.h"
#include "extensions/buildflags/buildflags.h"
#include "extensions/common/extension_id.h"
static_assert(BUILDFLAG(ENABLE_EXTENSIONS_CORE));
namespace content {
class BrowserContext;
}
namespace extensions {
// The class responsible for cleaning up the cruft left behind on the file
// system by uninstalled (or failed install) extensions.
// The class is owned by ExtensionService, but is mostly independent. Tasks to
// garbage collect extensions and isolated storage are posted once the
// ExtensionSystem signals ready.
class ExtensionGarbageCollector : public KeyedService, public InstallObserver {
public:
explicit ExtensionGarbageCollector(content::BrowserContext* context);
ExtensionGarbageCollector(const ExtensionGarbageCollector&) = delete;
ExtensionGarbageCollector& operator=(const ExtensionGarbageCollector&) =
delete;
~ExtensionGarbageCollector() override;
static ExtensionGarbageCollector* Get(content::BrowserContext* context);
// Manually trigger GarbageCollectExtensions() for testing.
void GarbageCollectExtensionsForTest();
// KeyedService:
void Shutdown() override;
// InstallObserver:
void OnBeginCrxInstall(content::BrowserContext* context,
const ExtensionId& extension_id) override;
void OnFinishCrxInstall(content::BrowserContext* context,
const base::FilePath& source_file,
const ExtensionId& extension_id,
const Extension* extension,
bool success) override;
protected:
// Cleans up the extension install directory. It can end up with garbage in it
// if extensions can't initially be removed when they are uninstalled (eg if a
// file is in use).
// Obsolete version directories are removed, as are directories that aren't
// found in the ExtensionPrefs.
// The "Temp" directory that is used during extension installation will get
// removed iff there are no pending installations.
virtual void GarbageCollectExtensions();
static void GarbageCollectExtensionsOnFileThread(
const base::FilePath& install_directory,
const std::multimap<ExtensionId, base::FilePath>& extension_paths,
bool unpacked);
// The BrowserContext associated with the GarbageCollector.
raw_ptr<content::BrowserContext> context_;
// The number of currently ongoing CRX installations. This is used to prevent
// garbage collection from running while a CRX is being installed.
int crx_installs_in_progress_;
// Generate weak pointers for safely posting to the file thread for garbage
// collection.
base::WeakPtrFactory<ExtensionGarbageCollector> weak_factory_{this};
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_GARBAGE_COLLECTOR_H_
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