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// Copyright 2014 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_USER_SCRIPT_LOADER_H_
#define CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_LOADER_H_
#include <map>
#include <set>
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observer.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "extensions/browser/extension_registry_observer.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/user_script.h"
namespace base {
class SharedMemory;
}
namespace content {
class BrowserContext;
class RenderProcessHost;
}
class Profile;
namespace extensions {
class ContentVerifier;
class ExtensionRegistry;
typedef std::map<ExtensionId, ExtensionSet::ExtensionPathAndDefaultLocale>
ExtensionsInfo;
// Manages one "logical unit" of user scripts in shared memory by constructing a
// new shared memory region when the set of scripts changes. Also notifies
// renderers of new shared memory region when new renderers appear, or when
// script reloading completes. Script loading lives on the UI thread. Instances
// of this class are embedded within classes with names ending in
// UserScriptMaster. These "master" classes implement the strategy for which
// scripts to load/unload on this logical unit of scripts.
class UserScriptLoader : public content::NotificationObserver,
public ExtensionRegistryObserver {
public:
// Parses the includes out of |script| and returns them in |includes|.
static bool ParseMetadataHeader(const base::StringPiece& script_text,
UserScript* script);
// A wrapper around the method to load user scripts, which is normally run on
// the file thread. Exposed only for tests.
static void LoadScriptsForTest(UserScriptList* user_scripts);
UserScriptLoader(Profile* profile,
const ExtensionId& owner_extension_id,
bool listen_for_extension_system_loaded);
~UserScriptLoader() override;
// Add |scripts| to the set of scripts managed by this loader.
void AddScripts(const std::set<UserScript>& scripts);
// Remove |scripts| from the set of scripts managed by this loader.
void RemoveScripts(const std::set<UserScript>& scripts);
// Clears the set of scripts managed by this loader.
void ClearScripts();
// Initiates procedure to start loading scripts on the file thread.
void StartLoad();
// Return true if we have any scripts ready.
bool scripts_ready() const { return shared_memory_.get() != NULL; }
private:
// content::NotificationObserver implementation.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// ExtensionRegistryObserver implementation.
void OnExtensionUnloaded(content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionInfo::Reason reason) override;
// Initiates script load when we have been waiting for the extension system
// to be ready.
void OnExtensionSystemReady();
// Returns whether or not it is possible that calls to AddScripts(),
// RemoveScripts(), and/or ClearScripts() have caused any real change in the
// set of scripts to be loaded.
bool ScriptsMayHaveChanged() const;
// Attempt to initiate a load.
void AttemptLoad();
// Called once we have finished loading the scripts on the file thread.
void OnScriptsLoaded(scoped_ptr<UserScriptList> user_scripts,
scoped_ptr<base::SharedMemory> shared_memory);
// Sends the renderer process a new set of user scripts. If
// |changed_extensions| is not empty, this signals that only the scripts from
// those extensions should be updated. Otherwise, all extensions will be
// updated.
void SendUpdate(content::RenderProcessHost* process,
base::SharedMemory* shared_memory,
const std::set<ExtensionId>& changed_extensions);
// Add to |changed_extensions_| those extensions referred to by |scripts|.
void ExpandChangedExtensions(const std::set<UserScript>& scripts);
// Update |extensions_info_| to contain info for each element of
// |changed_extensions_|.
void UpdateExtensionsInfo();
bool is_loading() const {
// Ownership of |user_scripts_| is passed to the file thread when loading.
return user_scripts_.get() == NULL;
}
// Manages our notification registrations.
content::NotificationRegistrar registrar_;
// Contains the scripts that were found the last time scripts were updated.
scoped_ptr<base::SharedMemory> shared_memory_;
// List of scripts from currently-installed extensions we should load.
scoped_ptr<UserScriptList> user_scripts_;
// Maps extension info needed for localization to an extension ID.
ExtensionsInfo extensions_info_;
// The mutually-exclusive sets of scripts that were added or removed since the
// last script load.
std::set<UserScript> added_scripts_;
std::set<UserScript> removed_scripts_;
// Indicates whether the the collection of scripts should be cleared before
// additions and removals on the next script load.
bool clear_scripts_;
// The IDs of the extensions which changed in the last update sent to the
// renderer.
ExtensionIdSet changed_extensions_;
// If the extensions service has finished loading its initial set of
// extensions.
bool extension_system_ready_;
// If list of user scripts is modified while we're loading it, we note
// that we're currently mid-load and then start over again once the load
// finishes. This boolean tracks whether another load is pending.
bool pending_load_;
// Whether or not we are currently loading.
bool is_loading_;
// The profile for which the scripts managed here are installed.
Profile* profile_;
// ID of the extension that owns these scripts, if any. This is only set to a
// non-empty value for declarative user script shared memory regions.
ExtensionId owner_extension_id_;
ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
extension_registry_observer_;
base::WeakPtrFactory<UserScriptLoader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(UserScriptLoader);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_LOADER_H_
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