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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.
#include "chrome/browser/extensions/api/push_messaging/push_messaging_api.h"
#include <set>
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_handler.h"
#include "chrome/browser/extensions/event_names.h"
#include "chrome/browser/extensions/event_router.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/sync/profile_sync_service.h"
#include "chrome/browser/sync/profile_sync_service_factory.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/extensions/api/experimental_push_messaging.h"
#include "chrome/common/extensions/extension.h"
#include "chrome/common/extensions/extension_set.h"
#include "chrome/common/extensions/permissions/api_permission.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_source.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/browser/signin/token_service.h"
#include "chrome/browser/signin/token_service_factory.h"
#include "chrome/common/extensions/api/experimental_push_messaging.h"
#include "content/public/browser/browser_thread.h"
#include "google_apis/gaia/gaia_constants.h"
#include "googleurl/src/gurl.h"
#include "chrome/browser/extensions/api/push_messaging/obfuscated_gaia_id_fetcher.h"
using content::BrowserThread;
namespace {
static const char kChannelIdSeparator[] = "/";
}
namespace extensions {
namespace glue = api::experimental_push_messaging;
PushMessagingEventRouter::PushMessagingEventRouter(Profile* profile)
: profile_(profile) {
}
PushMessagingEventRouter::~PushMessagingEventRouter() {}
void PushMessagingEventRouter::Init() {
ProfileSyncService* pss = ProfileSyncServiceFactory::GetForProfile(profile_);
// This may be NULL; for example, for the ChromeOS guest user. In these cases,
// just return without setting up anything, since it won't work anyway.
if (!pss)
return;
const ExtensionSet* extensions =
ExtensionSystem::Get(profile_)->extension_service()->extensions();
std::set<std::string> push_messaging_extensions;
for (ExtensionSet::const_iterator it = extensions->begin();
it != extensions->end(); ++it) {
const Extension* extension = *it;
if (extension->HasAPIPermission(APIPermission::kPushMessaging)) {
push_messaging_extensions.insert(extension->id());
}
}
handler_.reset(new PushMessagingInvalidationHandler(
pss, this, push_messaging_extensions));
// Register for extension load/unload as well, so we can update any
// registrations as appropriate.
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
content::Source<Profile>(profile_->GetOriginalProfile()));
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
content::Source<Profile>(profile_->GetOriginalProfile()));
}
void PushMessagingEventRouter::Shutdown() {
// We need an explicit Shutdown() due to the dependencies among the various
// ProfileKeyedServices. ProfileSyncService depends on ExtensionSystem, so
// it is destroyed before us in the destruction phase of Profile shutdown.
// As a result, we need to drop any references to it in the Shutdown() phase
// instead.
handler_.reset();
}
void PushMessagingEventRouter::SetMapperForTest(
scoped_ptr<PushMessagingInvalidationMapper> mapper) {
handler_ = mapper.Pass();
}
void PushMessagingEventRouter::TriggerMessageForTest(
const std::string& extension_id,
int subchannel,
const std::string& payload) {
OnMessage(extension_id, subchannel, payload);
}
void PushMessagingEventRouter::OnMessage(const std::string& extension_id,
int subchannel,
const std::string& payload) {
glue::Message message;
message.subchannel_id = subchannel;
message.payload = payload;
scoped_ptr<base::ListValue> args(glue::OnMessage::Create(message));
ExtensionSystem::Get(profile_)->event_router()->DispatchEventToExtension(
extension_id,
event_names::kOnPushMessage,
args.Pass(),
profile_,
GURL());
}
void PushMessagingEventRouter::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_EXTENSION_LOADED: {
const Extension* extension = content::Details<Extension>(details).ptr();
if (extension->HasAPIPermission(APIPermission::kPushMessaging)) {
handler_->RegisterExtension(extension->id());
}
break;
}
case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
const Extension* extension =
content::Details<UnloadedExtensionInfo>(details)->extension;
if (extension->HasAPIPermission(APIPermission::kPushMessaging)) {
handler_->UnregisterExtension(extension->id());
}
break;
}
default:
NOTREACHED();
}
}
// GetChannelId class functions
PushMessagingGetChannelIdFunction::PushMessagingGetChannelIdFunction() {}
PushMessagingGetChannelIdFunction::~PushMessagingGetChannelIdFunction() {}
bool PushMessagingGetChannelIdFunction::RunImpl() {
// Start the async fetch of the GAIA ID.
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
net::URLRequestContextGetter* context = profile()->GetRequestContext();
TokenService* token_service = TokenServiceFactory::GetForProfile(profile());
if (!token_service)
return false;
const std::string& refresh_token =
token_service->GetOAuth2LoginRefreshToken();
fetcher_.reset(new ObfuscatedGaiaIdFetcher(context, this, refresh_token));
// Check the cache, if we already have a gaia ID, use it instead of
// fetching the ID over the network.
const std::string& gaia_id =
token_service->GetTokenForService(GaiaConstants::kObfuscatedGaiaId);
if (!gaia_id.empty()) {
BuildAndSendResult(gaia_id, std::string());
return true;
}
// Balanced in ReportResult()
AddRef();
fetcher_->Start();
// Will finish asynchronously.
return true;
}
void PushMessagingGetChannelIdFunction::ReportResult(
const std::string& gaia_id, const std::string& error_string) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// Unpack the status and GaiaId parameters, and use it to build the
// channel ID here.
std::string channel_id(gaia_id);
BuildAndSendResult(gaia_id, error_string);
// Cache the obfuscated ID locally. It never changes for this user,
// and if we call the web API too often, we get errors due to rate limiting.
if (!gaia_id.empty()) {
TokenService* token_service = TokenServiceFactory::GetForProfile(profile());
if (token_service) {
token_service->AddAuthTokenManually(GaiaConstants::kObfuscatedGaiaId,
gaia_id);
}
}
// Balanced in RunImpl
Release();
}
void PushMessagingGetChannelIdFunction::BuildAndSendResult(
const std::string& gaia_id, const std::string& error_message) {
std::string channel_id;
if (!gaia_id.empty()) {
channel_id = gaia_id;
channel_id += kChannelIdSeparator;
channel_id += extension_id();
}
// TODO(petewil): It may be a good idea to further
// obfuscate the channel ID to prevent the user's obfuscated GAIA ID
// from being readily obtained. Security review will tell us if we need to.
// Create a ChannelId results object and set the fields.
glue::ChannelIdResult result;
result.channel_id = channel_id;
SetError(error_message);
results_ = glue::GetChannelId::Results::Create(result);
bool success = error_message.empty() && !gaia_id.empty();
SendResponse(success);
}
void PushMessagingGetChannelIdFunction::OnObfuscatedGaiaIdFetchSuccess(
const std::string& gaia_id) {
ReportResult(gaia_id, std::string());
}
void PushMessagingGetChannelIdFunction::OnObfuscatedGaiaIdFetchFailure(
const GoogleServiceAuthError& error) {
ReportResult(std::string(), error.error_message());
}
} // namespace extensions
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