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// 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.
#include "chrome/browser/extensions/extension_garbage_collector.h"
#include <map>
#include <string>
#include "base/bind.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "chrome/browser/extensions/extension_prefs.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/common/extensions/extension_file_util.h"
#include "content/public/browser/browser_thread.h"
namespace extensions {
ExtensionGarbageCollector::ExtensionGarbageCollector(
ExtensionService* extension_service)
: extension_service_(extension_service) {
}
ExtensionGarbageCollector::~ExtensionGarbageCollector() {
}
void ExtensionGarbageCollector::GarbageCollectExtensions() {
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
FilePath install_directory = extension_service_->install_directory();
// NOTE: It's important to use the file thread here because when the
// ExtensionService installs an extension, it begins on the file thread, and
// there are ordering dependencies between all of the extension-file-
// management tasks. If we do not follow the same thread pattern as the
// ExtensionService, then a race condition develops.
content::BrowserThread::PostTask(
content::BrowserThread::FILE, FROM_HERE,
base::Bind(
&ExtensionGarbageCollector::
CheckExtensionDirectoriesOnBackgroundThread,
base::Unretained(this),
install_directory));
}
void ExtensionGarbageCollector::CheckExtensionDirectoriesOnBackgroundThread(
const FilePath& install_directory) {
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
DVLOG(1) << "Garbage collecting extensions...";
if (!file_util::DirectoryExists(install_directory))
return;
std::set<FilePath> extension_paths;
file_util::FileEnumerator enumerator(install_directory,
false, // Not recursive.
file_util::FileEnumerator::DIRECTORIES);
for (FilePath extension_path = enumerator.Next(); !extension_path.empty();
extension_path = enumerator.Next()) {
std::string extension_id = extension_path.BaseName().MaybeAsASCII();
if (!Extension::IdIsValid(extension_id))
extension_id.clear();
// Delete directories that aren't valid IDs.
if (extension_id.empty()) {
DVLOG(1) << "Deleting invalid extension directory "
<< extension_path.value() << ".";
file_util::Delete(extension_path, true); // Recursive.
continue;
}
extension_paths.insert(extension_path);
}
content::BrowserThread::PostTask(
content::BrowserThread::UI, FROM_HERE,
base::Bind(
&ExtensionGarbageCollector::CheckExtensionPreferences,
base::Unretained(this),
extension_paths));
}
void ExtensionGarbageCollector::CheckExtensionPreferences(
const std::set<FilePath>& extension_paths) {
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
ExtensionPrefs* extension_prefs = extension_service_->extension_prefs();
if (extension_prefs->pref_service()->ReadOnly())
return;
scoped_ptr<ExtensionPrefs::ExtensionsInfo> info(
extension_prefs->GetInstalledExtensionsInfo());
std::map<std::string, FilePath> extension_pref_paths;
for (size_t i = 0; i < info->size(); ++i) {
extension_pref_paths[info->at(i)->extension_id] =
info->at(i)->extension_path;
}
std::set<std::string> extension_ids;
// Check each directory for a reference in the preferences.
for (std::set<FilePath>::const_iterator path = extension_paths.begin();
path != extension_paths.end();
++path) {
std::string extension_id;
extension_id = path->BaseName().MaybeAsASCII();
if (extension_id.empty())
continue;
extension_ids.insert(extension_id);
std::map<std::string, FilePath>::const_iterator iter =
extension_pref_paths.find(extension_id);
if (iter == extension_pref_paths.end()) {
DVLOG(1) << "Deleting unreferenced install for directory "
<< path->LossyDisplayName() << ".";
content::BrowserThread::PostTask(
content::BrowserThread::FILE, FROM_HERE,
base::Bind(
&extension_file_util::DeleteFile,
*path,
true)); // recursive.
continue;
}
// Clean up old version directories.
content::BrowserThread::PostTask(
content::BrowserThread::FILE, FROM_HERE,
base::Bind(
&ExtensionGarbageCollector::CleanupOldVersionsOnBackgroundThread,
base::Unretained(this), *path, iter->second.BaseName()));
}
// Check each entry in the preferences for an existing path.
for (std::map<std::string, FilePath>::const_iterator extension =
extension_pref_paths.begin();
extension != extension_pref_paths.end();
++extension) {
std::set<std::string>::const_iterator iter = extension_ids.find(
extension->first);
if (iter != extension_ids.end())
continue;
std::string extension_id = extension->first;
DVLOG(1) << "Could not access local content for extension with id "
<< extension_id << "; uninstalling extension.";
// If the extension failed to load fully (e.g. the user deleted an unpacked
// extension's manifest or the manifest points to the wrong path), we cannot
// use UninstallExtension, which relies on a valid Extension object.
if (!extension_service_->GetInstalledExtension(extension_id)) {
scoped_ptr<ExtensionInfo> info(extension_service_->extension_prefs()
->GetInstalledExtensionInfo(extension_id));
extension_service_->extension_prefs()->OnExtensionUninstalled(
extension_id, info->extension_location, false);
} else {
extension_service_->UninstallExtension(extension_id, false, NULL);
}
}
}
void ExtensionGarbageCollector::CleanupOldVersionsOnBackgroundThread(
const FilePath& path,
const FilePath& current_version) {
CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
file_util::FileEnumerator versions_enumerator(
path,
false, // Not recursive.
file_util::FileEnumerator::DIRECTORIES);
for (FilePath version_dir = versions_enumerator.Next();
!version_dir.value().empty();
version_dir = versions_enumerator.Next()) {
if (version_dir.BaseName() != current_version) {
DVLOG(1) << "Deleting old version for directory "
<< version_dir.LossyDisplayName() << ".";
if (!file_util::Delete(version_dir, true)) // Recursive.
NOTREACHED();
}
}
}
} // namespace extensions
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