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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 "content/renderer/usb/web_usb_client_impl.h"
#include <stddef.h>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/move.h"
#include "base/strings/utf_string_conversions.h"
#include "content/child/mojo/type_converters.h"
#include "content/child/scoped_web_callbacks.h"
#include "content/public/common/service_registry.h"
#include "content/renderer/usb/type_converters.h"
#include "content/renderer/usb/web_usb_device_impl.h"
#include "mojo/public/cpp/bindings/array.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "third_party/WebKit/public/platform/WebCallbacks.h"
#include "third_party/WebKit/public/platform/WebPassOwnPtr.h"
#include "third_party/WebKit/public/platform/modules/webusb/WebUSBDeviceFilter.h"
#include "third_party/WebKit/public/platform/modules/webusb/WebUSBDeviceInfo.h"
#include "third_party/WebKit/public/platform/modules/webusb/WebUSBDeviceRequestOptions.h"
#include "third_party/WebKit/public/platform/modules/webusb/WebUSBError.h"
namespace content {
namespace {
const char kNoServiceError[] = "USB service unavailable.";
// Generic default rejection handler for any WebUSB callbacks type. Assumes
// |CallbacksType| is a blink::WebCallbacks<T, const blink::WebUSBError&>
// for any type |T|.
template <typename CallbacksType>
void RejectCallbacksWithError(const blink::WebUSBError& error,
scoped_ptr<CallbacksType> callbacks) {
callbacks->onError(error);
}
// Create a new ScopedWebCallbacks for WebUSB client callbacks, defaulting to
// a "no service" rejection.
template <typename CallbacksType>
ScopedWebCallbacks<CallbacksType> MakeScopedUSBCallbacks(
CallbacksType* callbacks) {
return make_scoped_web_callbacks(
callbacks,
base::Bind(&RejectCallbacksWithError<CallbacksType>,
blink::WebUSBError(blink::WebUSBError::Error::NotFound,
base::ASCIIToUTF16(kNoServiceError))));
}
void OnGetDevicesComplete(
ScopedWebCallbacks<blink::WebUSBClientGetDevicesCallbacks> scoped_callbacks,
device::usb::DeviceManager* device_manager,
mojo::Array<device::usb::DeviceInfoPtr> results) {
blink::WebVector<blink::WebUSBDevice*>* devices =
new blink::WebVector<blink::WebUSBDevice*>(results.size());
for (size_t i = 0; i < results.size(); ++i) {
device::usb::DevicePtr device;
device_manager->GetDevice(results[i]->guid, mojo::GetProxy(&device));
(*devices)[i] = new WebUSBDeviceImpl(
std::move(device),
mojo::ConvertTo<blink::WebUSBDeviceInfo>(results[i]));
}
scoped_callbacks.PassCallbacks()->onSuccess(blink::adoptWebPtr(devices));
}
void OnRequestDevicesComplete(
ScopedWebCallbacks<blink::WebUSBClientRequestDeviceCallbacks> callbacks,
device::usb::DeviceManager* device_manager,
device::usb::DeviceInfoPtr result) {
auto scoped_callbacks = callbacks.PassCallbacks();
if (result) {
device::usb::DevicePtr device;
device_manager->GetDevice(result->guid, mojo::GetProxy(&device));
blink::WebUSBDevice* web_usb_device = new WebUSBDeviceImpl(
std::move(device), mojo::ConvertTo<blink::WebUSBDeviceInfo>(result));
scoped_callbacks->onSuccess(blink::adoptWebPtr(web_usb_device));
} else {
scoped_callbacks->onError(
blink::WebUSBError(blink::WebUSBError::Error::NotFound,
base::ASCIIToUTF16("No device selected.")));
}
}
} // namespace
WebUSBClientImpl::WebUSBClientImpl(content::ServiceRegistry* service_registry)
: service_registry_(service_registry) {}
WebUSBClientImpl::~WebUSBClientImpl() {}
void WebUSBClientImpl::getDevices(
blink::WebUSBClientGetDevicesCallbacks* callbacks) {
auto scoped_callbacks = MakeScopedUSBCallbacks(callbacks);
GetDeviceManager()->GetDevices(
nullptr,
base::Bind(&OnGetDevicesComplete, base::Passed(&scoped_callbacks),
base::Unretained(device_manager_.get())));
}
void WebUSBClientImpl::requestDevice(
const blink::WebUSBDeviceRequestOptions& options,
blink::WebUSBClientRequestDeviceCallbacks* callbacks) {
if (!chooser_service_) {
service_registry_->ConnectToRemoteService(
mojo::GetProxy(&chooser_service_));
}
auto scoped_callbacks = MakeScopedUSBCallbacks(callbacks);
mojo::Array<device::usb::DeviceFilterPtr> device_filters =
mojo::Array<device::usb::DeviceFilterPtr>::From(options.filters);
chooser_service_->GetPermission(
std::move(device_filters),
base::Bind(&OnRequestDevicesComplete, base::Passed(&scoped_callbacks),
base::Unretained(device_manager_.get())));
}
void WebUSBClientImpl::setObserver(Observer* observer) {
if (!observer_) {
// Set up two sequential calls to GetDeviceChanges to avoid latency.
device::usb::DeviceManager* device_manager = GetDeviceManager();
device_manager->GetDeviceChanges(base::Bind(
&WebUSBClientImpl::OnDeviceChangeNotification, base::Unretained(this)));
device_manager->GetDeviceChanges(base::Bind(
&WebUSBClientImpl::OnDeviceChangeNotification, base::Unretained(this)));
}
observer_ = observer;
}
device::usb::DeviceManager* WebUSBClientImpl::GetDeviceManager() {
if (!device_manager_)
service_registry_->ConnectToRemoteService(mojo::GetProxy(&device_manager_));
return device_manager_.get();
}
void WebUSBClientImpl::OnDeviceChangeNotification(
device::usb::DeviceChangeNotificationPtr notification) {
if (!observer_)
return;
device_manager_->GetDeviceChanges(base::Bind(
&WebUSBClientImpl::OnDeviceChangeNotification, base::Unretained(this)));
for (size_t i = 0; i < notification->devices_added.size(); ++i) {
const device::usb::DeviceInfoPtr& device_info =
notification->devices_added[i];
device::usb::DevicePtr device;
device_manager_->GetDevice(device_info->guid, mojo::GetProxy(&device));
observer_->onDeviceConnected(blink::adoptWebPtr(new WebUSBDeviceImpl(
std::move(device),
mojo::ConvertTo<blink::WebUSBDeviceInfo>(device_info))));
}
for (size_t i = 0; i < notification->devices_removed.size(); ++i) {
const device::usb::DeviceInfoPtr& device_info =
notification->devices_removed[i];
observer_->onDeviceDisconnected(blink::adoptWebPtr(new WebUSBDeviceImpl(
nullptr, mojo::ConvertTo<blink::WebUSBDeviceInfo>(device_info))));
}
}
} // namespace content
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