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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.
#include "chrome/browser/extensions/extension_gcm_app_handler.h"
#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/services/gcm/gcm_profile_service.h"
#include "chrome/browser/services/gcm/gcm_profile_service_factory.h"
#include "components/gcm_driver/gcm_driver.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_system.h"
#include "extensions/common/extension.h"
#include "extensions/common/permissions/permissions_data.h"
#if !defined(OS_ANDROID)
#include "chrome/browser/extensions/api/gcm/gcm_api.h"
#endif
namespace extensions {
namespace {
const char kDummyAppId[] = "extension.guard.dummy.id";
base::LazyInstance<BrowserContextKeyedAPIFactory<ExtensionGCMAppHandler> >
g_factory = LAZY_INSTANCE_INITIALIZER;
bool IsGCMPermissionEnabled(const Extension* extension) {
return extension->permissions_data()->HasAPIPermission(APIPermission::kGcm);
}
} // namespace
// static
BrowserContextKeyedAPIFactory<ExtensionGCMAppHandler>*
ExtensionGCMAppHandler::GetFactoryInstance() {
return g_factory.Pointer();
}
ExtensionGCMAppHandler::ExtensionGCMAppHandler(content::BrowserContext* context)
: profile_(Profile::FromBrowserContext(context)),
extension_registry_observer_(this),
weak_factory_(this) {
extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
#if !defined(OS_ANDROID)
js_event_router_.reset(new extensions::GcmJsEventRouter(profile_));
#endif
}
ExtensionGCMAppHandler::~ExtensionGCMAppHandler() {
const ExtensionSet& enabled_extensions =
ExtensionRegistry::Get(profile_)->enabled_extensions();
for (ExtensionSet::const_iterator extension = enabled_extensions.begin();
extension != enabled_extensions.end();
++extension) {
if (IsGCMPermissionEnabled(extension->get()))
GetGCMDriver()->RemoveAppHandler((*extension)->id());
}
}
void ExtensionGCMAppHandler::ShutdownHandler() {
#if !defined(OS_ANDROID)
js_event_router_.reset();
#endif
}
void ExtensionGCMAppHandler::OnMessage(
const std::string& app_id,
const gcm::GCMClient::IncomingMessage& message) {
#if !defined(OS_ANDROID)
js_event_router_->OnMessage(app_id, message);
#endif
}
void ExtensionGCMAppHandler::OnMessagesDeleted(const std::string& app_id) {
#if !defined(OS_ANDROID)
js_event_router_->OnMessagesDeleted(app_id);
#endif
}
void ExtensionGCMAppHandler::OnSendError(
const std::string& app_id,
const gcm::GCMClient::SendErrorDetails& send_error_details) {
#if !defined(OS_ANDROID)
js_event_router_->OnSendError(app_id, send_error_details);
#endif
}
void ExtensionGCMAppHandler::OnExtensionLoaded(
content::BrowserContext* browser_context,
const Extension* extension) {
if (IsGCMPermissionEnabled(extension))
AddAppHandler(extension->id());
}
void ExtensionGCMAppHandler::OnExtensionUnloaded(
content::BrowserContext* browser_context,
const Extension* extension,
UnloadedExtensionInfo::Reason reason) {
if (!IsGCMPermissionEnabled(extension))
return;
if (reason == UnloadedExtensionInfo::REASON_UPDATE &&
GetGCMDriver()->app_handlers().size() == 1) {
// When the extension is being updated, it will be first unloaded and then
// loaded again by ExtensionService::AddExtension. If the app handler for
// this extension is the only handler, removing it and adding it again will
// cause the GCM service being stopped and restarted unnecessarily. To work
// around this, we add a dummy app handler to guard against it. This dummy
// app handler will be removed once the extension loading logic is done.
//
// Also note that the GCM message routing will not be interruptted during
// the update process since unloading and reloading extension are done in
// the single function ExtensionService::AddExtension.
AddDummyAppHandler();
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&ExtensionGCMAppHandler::RemoveDummyAppHandler,
weak_factory_.GetWeakPtr()));
}
RemoveAppHandler(extension->id());
}
void ExtensionGCMAppHandler::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension) {
if (IsGCMPermissionEnabled(extension)) {
GetGCMDriver()->Unregister(
extension->id(),
base::Bind(&ExtensionGCMAppHandler::OnUnregisterCompleted,
weak_factory_.GetWeakPtr(),
extension->id()));
RemoveAppHandler(extension->id());
}
}
void ExtensionGCMAppHandler::AddDummyAppHandler() {
AddAppHandler(kDummyAppId);
}
void ExtensionGCMAppHandler::RemoveDummyAppHandler() {
RemoveAppHandler(kDummyAppId);
}
gcm::GCMDriver* ExtensionGCMAppHandler::GetGCMDriver() const {
return gcm::GCMProfileServiceFactory::GetForProfile(profile_)->driver();
}
void ExtensionGCMAppHandler::OnUnregisterCompleted(
const std::string& app_id, gcm::GCMClient::Result result) {
// Nothing to do.
}
void ExtensionGCMAppHandler::AddAppHandler(const std::string& app_id) {
GetGCMDriver()->AddAppHandler(app_id, this);
}
void ExtensionGCMAppHandler::RemoveAppHandler(const std::string& app_id) {
GetGCMDriver()->RemoveAppHandler(app_id);
}
} // namespace extensions
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