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// Copyright (c) 2013 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_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/files/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"
#include "chrome/browser/extensions/updater/local_extension_cache.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "extensions/browser/updater/extension_downloader_delegate.h"
namespace base {
class DictionaryValue;
}
namespace extensions {
class ExtensionDownloader;
}
namespace net {
class URLRequestContextGetter;
}
namespace chromeos {
// The ExternalCache manages a cache for external extensions.
class ExternalCache : public content::NotificationObserver,
public extensions::ExtensionDownloaderDelegate {
public:
typedef base::Callback<void(const std::string& id, bool success)>
PutExternalExtensionCallback;
class Delegate {
public:
virtual ~Delegate() {}
// Caller owns |prefs|.
virtual void OnExtensionListsUpdated(
const base::DictionaryValue* prefs) = 0;
// Called after extension with |id| is loaded in cache.
virtual void OnExtensionLoadedInCache(const std::string& id) {}
// Called when extension with |id| is failed with downloading for |error|.
virtual void OnExtensionDownloadFailed(
const std::string& id,
extensions::ExtensionDownloaderDelegate::Error error) {}
// Cache needs to provide already installed extensions otherwise they
// will be removed. Cache calls this function to get version of installed
// extension or empty string if not installed.
virtual std::string GetInstalledExtensionVersion(const std::string& id);
};
// The |request_context| is used for update checks. All file I/O is done via
// the |backend_task_runner|. If |always_check_updates| is |false|, update
// checks are performed for extensions that have an |external_update_url|
// only. If |wait_for_cache_initialization| is |true|, the cache contents will
// not be read until a flag file appears in the cache directory, signaling
// that the cache is ready.
ExternalCache(const base::FilePath& cache_dir,
net::URLRequestContextGetter* request_context,
const scoped_refptr<base::SequencedTaskRunner>&
backend_task_runner,
Delegate* delegate,
bool always_check_updates,
bool wait_for_cache_initialization);
~ExternalCache() override;
// Returns already cached extensions.
const base::DictionaryValue* cached_extensions() {
return cached_extensions_.get();
}
// Implementation of content::NotificationObserver:
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// Implementation of ExtensionDownloaderDelegate:
void OnExtensionDownloadFailed(const std::string& id,
Error error,
const PingResult& ping_result,
const std::set<int>& request_ids) override;
void OnExtensionDownloadFinished(const extensions::CRXFileInfo& file,
bool file_ownership_passed,
const GURL& download_url,
const std::string& version,
const PingResult& ping_result,
const std::set<int>& request_ids,
const InstallCallback& callback) override;
bool IsExtensionPending(const std::string& id) override;
bool GetExtensionExistingVersion(const std::string& id,
std::string* version) override;
// Shut down the cache. The |callback| will be invoked when the cache has shut
// down completely and there are no more pending file I/O operations.
void Shutdown(const base::Closure& callback);
// Replace the list of extensions to cache with |prefs| and perform update
// checks for these.
void UpdateExtensionsList(scoped_ptr<base::DictionaryValue> prefs);
// If a user of one of the ExternalCache's extensions detects that
// the extension is damaged then this method can be used to remove it from
// the cache and retry to download it after a restart.
void OnDamagedFileDetected(const base::FilePath& path);
// Removes extensions listed in |ids| from external cache, corresponding crx
// files will be removed from disk too.
void RemoveExtensions(const std::vector<std::string>& ids);
// If extension with |id| exists in the cache, returns |true|, |file_path| and
// |version| for the extension. Extension will be marked as used with current
// timestamp.
bool GetExtension(const std::string& id,
base::FilePath* file_path,
std::string* version);
// Puts the external |crx_file_path| into |local_cache_| for extension with
// |id|.
void PutExternalExtension(const std::string& id,
const base::FilePath& crx_file_path,
const std::string& version,
const PutExternalExtensionCallback& callback);
private:
// Notifies the that the cache has been updated, providing
// extensions loader with an updated list of extensions.
void UpdateExtensionLoader();
// Checks the cache contents and initiate download if needed.
void CheckCache();
// Invoked on the UI thread when a new entry has been installed in the cache.
void OnPutExtension(const std::string& id,
const base::FilePath& file_path,
bool file_ownership_passed);
// Invoked on the UI thread when the external extension has been installed
// in the local cache by calling PutExternalExtension.
void OnPutExternalExtension(const std::string& id,
const PutExternalExtensionCallback& callback,
const base::FilePath& file_path,
bool file_ownership_passed);
extensions::LocalExtensionCache local_cache_;
// Request context used by the |downloader_|.
scoped_refptr<net::URLRequestContextGetter> request_context_;
// Task runner for executing file I/O tasks.
const scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
// Delegate that would like to get notifications about cache updates.
Delegate* delegate_;
// Updates needs to be check for the extensions with external_crx too.
bool always_check_updates_;
// Set to true if cache should wait for initialization flag file.
bool wait_for_cache_initialization_;
// This is the list of extensions currently configured.
scoped_ptr<base::DictionaryValue> extensions_;
// This contains extensions that are both currently configured
// and that have a valid crx in the cache.
scoped_ptr<base::DictionaryValue> cached_extensions_;
// Used to download the extensions and to check for updates.
scoped_ptr<extensions::ExtensionDownloader> downloader_;
// Observes failures to install CRX files.
content::NotificationRegistrar notification_registrar_;
// Weak factory for callbacks.
base::WeakPtrFactory<ExternalCache> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ExternalCache);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
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