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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.
#ifndef CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
#define CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
#include <string>
#include <vector>
#include "base/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/prefs/public/pref_change_registrar.h"
#include "base/values.h"
class ExtensionServiceInterface;
class PrefService;
namespace extensions {
class Extension;
// For registering, loading, and unloading component extensions.
class ComponentLoader {
public:
ComponentLoader(ExtensionServiceInterface* extension_service,
PrefService* prefs,
PrefService* local_state);
virtual ~ComponentLoader();
size_t registered_extensions_count() const {
return component_extensions_.size();
}
// Creates and loads all registered component extensions, including those with
// background pages.
void BulkLoadAll();
// Create all registered component extensions, loading those without
// background pages and deferring others until a call to BulkLoadDeferred.
void BulkLoadDeferBackgroundPages();
// Load component extensions deferred in the last call to
// BulkLoadDeferBackgroundPages.
void BulkLoadDeferred();
// Clear the list of all registered extensions and unloads them from the
// extension service.
void RemoveAll();
// Registers and possibly loads a component extension. If ExtensionService
// has been initialized, the extension is loaded; otherwise, the load is
// deferred until LoadAll is called. The ID of the added extension is
// returned.
//
// Component extension manifests must contain a "key" property with a unique
// public key, serialized in base64. You can create a suitable value with the
// following commands on a unixy system:
//
// ssh-keygen -t rsa -b 1024 -N '' -f /tmp/key.pem
// openssl rsa -pubout -outform DER < /tmp/key.pem 2>/dev/null | base64 -w 0
std::string Add(const std::string& manifest_contents,
const FilePath& root_directory);
// Convenience method for registering a component extension by resource id.
std::string Add(int manifest_resource_id,
const FilePath& root_directory);
// Loads a component extension from file system. Replaces previously added
// extension with the same ID.
std::string AddOrReplace(const FilePath& path);
// Returns true if an extension with the specified id has been added.
bool Exists(const std::string& id) const;
// Unloads a component extension and removes it from the list of component
// extensions to be loaded.
void Remove(const FilePath& root_directory);
void Remove(const std::string& id);
// Call this during test setup to load component extensions that have
// background pages for testing, which could otherwise interfere with tests.
static void EnableBackgroundExtensionsForTesting();
// Adds the default component extensions. If |skip_session_components|
// the loader will skip loading component extensions that weren't supposed to
// be loaded unless we are in signed user session (ChromeOS). For all other
// platforms this |skip_session_components| is expected to be unset.
void AddDefaultComponentExtensions(bool skip_session_components);
static void RegisterUserPrefs(PrefService* prefs);
// Parse the given JSON manifest. Returns NULL if it cannot be parsed, or if
// if the result is not a DictionaryValue.
DictionaryValue* ParseManifest(const std::string& manifest_contents) const;
// Clear the list of registered extensions.
void ClearAllRegistered();
// Reloads a registered component extension.
void Reload(const std::string& extension_id);
private:
// Information about a registered component extension.
struct ComponentExtensionInfo {
ComponentExtensionInfo(const DictionaryValue* manifest,
const FilePath& root_directory);
// The parsed contents of the extensions's manifest file.
const DictionaryValue* manifest;
// Directory where the extension is stored.
FilePath root_directory;
// The component extension's ID.
std::string extension_id;
};
std::string Add(const DictionaryValue* parsed_manifest,
const FilePath& root_directory);
// Loads a registered component extension.
void Load(const ComponentExtensionInfo& info,
bool defer_if_has_background_page);
void AddDefaultComponentExtensionsWithBackgroundPages(
bool skip_session_components);
void AddFileManagerExtension();
#if defined(OS_CHROMEOS)
void AddGaiaAuthExtension();
#endif
// Add the enterprise webstore extension, or reload it if already loaded.
void AddOrReloadEnterpriseWebStore();
void AddChromeApp();
// Unloads |component| from the memory.
void UnloadComponent(ComponentExtensionInfo* component);
PrefService* prefs_;
PrefService* local_state_;
ExtensionServiceInterface* extension_service_;
// List of registered component extensions (see Extension::Location).
typedef std::vector<ComponentExtensionInfo> RegisteredComponentExtensions;
RegisteredComponentExtensions component_extensions_;
PrefChangeRegistrar pref_change_registrar_;
// Extensions with background pages deferred by LoadAll(true).
typedef std::vector<scoped_refptr<const Extension> > DeferredAtLoadExtensions;
DeferredAtLoadExtensions deferred_at_load_extensions;
DISALLOW_COPY_AND_ASSIGN(ComponentLoader);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_COMPONENT_LOADER_H_
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