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// Copyright 2013 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/mdns/mdns_api.h"
#include <vector>
#include "base/lazy_instance.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/common/extensions/api/mdns.h"
namespace extensions {
namespace mdns = api::mdns;
namespace {
// Whitelisted mDNS service types.
const char kCastServiceType[] = "_googlecast._tcp.local";
const char kPrivetServiceType[] = "_privet._tcp.local";
const char kTestServiceType[] = "_testing._tcp.local";
bool IsServiceTypeWhitelisted(const std::string& service_type) {
return service_type == kCastServiceType ||
service_type == kPrivetServiceType ||
service_type == kTestServiceType;
}
} // namespace
MDnsAPI::MDnsAPI(content::BrowserContext* context) : browser_context_(context) {
DCHECK(browser_context_);
EventRouter::Get(context)
->RegisterObserver(this, mdns::OnServiceList::kEventName);
}
MDnsAPI::~MDnsAPI() {
if (dns_sd_registry_.get()) {
dns_sd_registry_->RemoveObserver(this);
}
}
// static
MDnsAPI* MDnsAPI::Get(content::BrowserContext* context) {
return BrowserContextKeyedAPIFactory<MDnsAPI>::Get(context);
}
static base::LazyInstance<BrowserContextKeyedAPIFactory<MDnsAPI> > g_factory =
LAZY_INSTANCE_INITIALIZER;
// static
BrowserContextKeyedAPIFactory<MDnsAPI>* MDnsAPI::GetFactoryInstance() {
return g_factory.Pointer();
}
void MDnsAPI::SetDnsSdRegistryForTesting(
scoped_ptr<DnsSdRegistry> dns_sd_registry) {
dns_sd_registry_ = dns_sd_registry.Pass();
}
DnsSdRegistry* MDnsAPI::dns_sd_registry() {
DCHECK(thread_checker_.CalledOnValidThread());
if (!dns_sd_registry_.get()) {
dns_sd_registry_.reset(new extensions::DnsSdRegistry());
dns_sd_registry_->AddObserver(this);
}
return dns_sd_registry_.get();
}
void MDnsAPI::OnListenerAdded(const EventListenerInfo& details) {
DCHECK(thread_checker_.CalledOnValidThread());
UpdateMDnsListeners(details);
}
void MDnsAPI::OnListenerRemoved(const EventListenerInfo& details) {
DCHECK(thread_checker_.CalledOnValidThread());
UpdateMDnsListeners(details);
}
void MDnsAPI::UpdateMDnsListeners(const EventListenerInfo& details) {
std::set<std::string> new_service_types;
// Check all listeners for service type filers.
const EventListenerMap::ListenerList& listeners =
extensions::EventRouter::Get(browser_context_)
->listeners()
.GetEventListenersByName(details.event_name);
for (EventListenerMap::ListenerList::const_iterator it = listeners.begin();
it != listeners.end(); ++it) {
base::DictionaryValue* filter = ((*it)->filter());
std::string filter_value;
filter->GetStringASCII(kEventFilterServiceTypeKey, &filter_value);
if (filter_value.empty())
continue;
new_service_types.insert(filter_value);
}
// Find all the added and removed service types since last update.
std::set<std::string> added_service_types =
base::STLSetDifference<std::set<std::string> >(
new_service_types, service_types_);
std::set<std::string> removed_service_types =
base::STLSetDifference<std::set<std::string> >(
service_types_, new_service_types);
// Update the registry.
DnsSdRegistry* registry = dns_sd_registry();
for (std::set<std::string>::iterator it = added_service_types.begin();
it != added_service_types.end(); ++it) {
if (IsServiceTypeWhitelisted(*it))
registry->RegisterDnsSdListener(*it);
}
for (std::set<std::string>::iterator it = removed_service_types.begin();
it != removed_service_types.end(); ++it) {
if (IsServiceTypeWhitelisted(*it))
registry->UnregisterDnsSdListener(*it);
}
service_types_ = new_service_types;
}
void MDnsAPI::OnDnsSdEvent(const std::string& service_type,
const DnsSdRegistry::DnsSdServiceList& services) {
DCHECK(thread_checker_.CalledOnValidThread());
std::vector<linked_ptr<mdns::MDnsService> > args;
for (DnsSdRegistry::DnsSdServiceList::const_iterator it = services.begin();
it != services.end(); ++it) {
linked_ptr<mdns::MDnsService> mdns_service =
make_linked_ptr(new mdns::MDnsService);
mdns_service->service_name = (*it).service_name;
mdns_service->service_host_port = (*it).service_host_port;
mdns_service->ip_address = (*it).ip_address;
mdns_service->service_data = (*it).service_data;
args.push_back(mdns_service);
}
scoped_ptr<base::ListValue> results = mdns::OnServiceList::Create(args);
scoped_ptr<Event> event(
new Event(mdns::OnServiceList::kEventName, results.Pass()));
event->restrict_to_browser_context = browser_context_;
event->filter_info.SetServiceType(service_type);
VLOG(1) << "Broadcasting OnServiceList event: " << event.get();
// TODO(justinlin): To avoid having listeners without filters getting all
// events, modify API to have this event require filters.
extensions::EventRouter::Get(browser_context_)->BroadcastEvent(event.Pass());
}
} // namespace extensions
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