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// Copyright 2015 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 "extensions/browser/api/usb/usb_event_router.h"
#include "device/core/device_client.h"
#include "device/usb/usb_device.h"
#include "extensions/browser/api/device_permissions_manager.h"
#include "extensions/common/api/usb.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/common/permissions/usb_device_permission.h"
namespace usb = extensions::core_api::usb;
using content::BrowserThread;
using device::UsbDevice;
using device::UsbService;
namespace extensions {
namespace {
// Returns true iff the given extension has permission to receive events
// regarding this device.
bool WillDispatchDeviceEvent(scoped_refptr<UsbDevice> device,
content::BrowserContext* browser_context,
const Extension* extension,
base::ListValue* event_args) {
// Check install-time and optional permissions.
UsbDevicePermission::CheckParam param(
device->vendor_id(), device->product_id(),
UsbDevicePermissionData::UNSPECIFIED_INTERFACE);
if (extension->permissions_data()->CheckAPIPermissionWithParam(
APIPermission::kUsbDevice, ¶m)) {
return true;
}
// Check permissions granted through chrome.usb.getUserSelectedDevices.
DevicePermissions* device_permissions =
DevicePermissionsManager::Get(browser_context)
->GetForExtension(extension->id());
if (device_permissions->FindEntry(device).get()) {
return true;
}
return false;
}
base::LazyInstance<BrowserContextKeyedAPIFactory<UsbEventRouter>>::Leaky
g_event_router_factory = LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
BrowserContextKeyedAPIFactory<UsbEventRouter>*
UsbEventRouter::GetFactoryInstance() {
return g_event_router_factory.Pointer();
}
UsbEventRouter::UsbEventRouter(content::BrowserContext* browser_context)
: browser_context_(browser_context), observer_(this) {
EventRouter* event_router = EventRouter::Get(browser_context_);
if (event_router) {
event_router->RegisterObserver(this, usb::OnDeviceAdded::kEventName);
event_router->RegisterObserver(this, usb::OnDeviceRemoved::kEventName);
}
}
UsbEventRouter::~UsbEventRouter() {
}
void UsbEventRouter::Shutdown() {
EventRouter* event_router = EventRouter::Get(browser_context_);
if (event_router) {
event_router->UnregisterObserver(this);
}
}
void UsbEventRouter::OnListenerAdded(const EventListenerInfo& details) {
UsbService* service = device::DeviceClient::Get()->GetUsbService();
if (!observer_.IsObserving(service)) {
observer_.Add(service);
}
}
void UsbEventRouter::OnDeviceAdded(scoped_refptr<device::UsbDevice> device) {
DispatchEvent(usb::OnDeviceAdded::kEventName, device);
}
void UsbEventRouter::OnDeviceRemoved(scoped_refptr<device::UsbDevice> device) {
DispatchEvent(usb::OnDeviceRemoved::kEventName, device);
}
void UsbEventRouter::DispatchEvent(const std::string& event_name,
scoped_refptr<UsbDevice> device) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
EventRouter* event_router = EventRouter::Get(browser_context_);
if (event_router) {
usb::Device device_obj;
device_obj.device = device->unique_id();
device_obj.vendor_id = device->vendor_id();
device_obj.product_id = device->product_id();
scoped_ptr<Event> event;
if (event_name == usb::OnDeviceAdded::kEventName) {
event.reset(new Event(usb::OnDeviceAdded::kEventName,
usb::OnDeviceAdded::Create(device_obj)));
} else {
DCHECK(event_name == usb::OnDeviceRemoved::kEventName);
event.reset(new Event(usb::OnDeviceRemoved::kEventName,
usb::OnDeviceRemoved::Create(device_obj)));
}
event->will_dispatch_callback =
base::Bind(&WillDispatchDeviceEvent, device);
event_router->BroadcastEvent(event.Pass());
}
}
} // extensions
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