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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 "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/extensions/api/gcm/gcm_api.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 "chrome/browser/services/gcm/instance_id/instance_id_profile_service.h"
#include "chrome/browser/services/gcm/instance_id/instance_id_profile_service_factory.h"
#include "components/gcm_driver/gcm_driver.h"
#include "components/gcm_driver/instance_id/instance_id_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"
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_));
js_event_router_.reset(new extensions::GcmJsEventRouter(profile_));
}
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() {
js_event_router_.reset();
}
void ExtensionGCMAppHandler::OnMessage(const std::string& app_id,
const gcm::IncomingMessage& message) {
js_event_router_->OnMessage(app_id, message);
}
void ExtensionGCMAppHandler::OnMessagesDeleted(const std::string& app_id) {
js_event_router_->OnMessagesDeleted(app_id);
}
void ExtensionGCMAppHandler::OnSendError(
const std::string& app_id,
const gcm::GCMClient::SendErrorDetails& send_error_details) {
js_event_router_->OnSendError(app_id, send_error_details);
}
void ExtensionGCMAppHandler::OnSendAcknowledged(
const std::string& app_id,
const std::string& message_id) {
// This event is not exposed to JS API. It terminates here.
}
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.
//
// Note that this dummy app handler is added when there is at least one
// handler. This is because there might be a built-in app handler, like
// GCMAccountMapper, which is automatically added and removed by
// GCMDriverDesktop.
//
// 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::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&ExtensionGCMAppHandler::RemoveDummyAppHandler,
weak_factory_.GetWeakPtr()));
}
// When the extention is being uninstalled, it will be unloaded first. We
// should not remove the app handler in this case and it will be handled
// in OnExtensionUninstalled.
if (reason != UnloadedExtensionInfo::REASON_UNINSTALL)
RemoveAppHandler(extension->id());
}
void ExtensionGCMAppHandler::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension,
extensions::UninstallReason reason) {
if (IsGCMPermissionEnabled(extension)) {
// Let's first remove InstanceID data. GCM unregistration will be triggered
// after the asynchronous call is returned in OnDeleteIDCompleted.
GetInstanceIDDriver()->GetInstanceID(extension->id())->DeleteID(
base::Bind(&ExtensionGCMAppHandler::OnDeleteIDCompleted,
weak_factory_.GetWeakPtr(),
extension->id()));
}
}
void ExtensionGCMAppHandler::AddDummyAppHandler() {
AddAppHandler(kDummyAppId);
}
void ExtensionGCMAppHandler::RemoveDummyAppHandler() {
RemoveAppHandler(kDummyAppId);
}
gcm::GCMDriver* ExtensionGCMAppHandler::GetGCMDriver() const {
return gcm::GCMProfileServiceFactory::GetForProfile(profile_)->driver();
}
instance_id::InstanceIDDriver* ExtensionGCMAppHandler::GetInstanceIDDriver()
const {
return instance_id::InstanceIDProfileServiceFactory::GetForProfile(profile_)->
driver();
}
void ExtensionGCMAppHandler::OnUnregisterCompleted(
const std::string& app_id, gcm::GCMClient::Result result) {
RemoveAppHandler(app_id);
}
void ExtensionGCMAppHandler::OnDeleteIDCompleted(
const std::string& app_id, instance_id::InstanceID::Result result) {
GetGCMDriver()->Unregister(
app_id,
base::Bind(&ExtensionGCMAppHandler::OnUnregisterCompleted,
weak_factory_.GetWeakPtr(),
app_id));
// InstanceIDDriver::RemoveInstanceID will delete the InstanceID itself.
// Postpone to do it outside this calling context to avoid any risk to
// the caller.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::Bind(&ExtensionGCMAppHandler::RemoveInstanceID,
weak_factory_.GetWeakPtr(), app_id));
}
void ExtensionGCMAppHandler::RemoveInstanceID(const std::string& app_id) {
GetInstanceIDDriver()->RemoveInstanceID(app_id);
}
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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