Connect WebUSB client interface to the devices app

content/renderer/usb/web_usb_client_impl.cc

+// 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 "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/scoped_web_callbacks.h"
+#include "content/renderer/usb/type_converters.h"
+#include "content/renderer/usb/web_usb_device_impl.h"
+#include "device/devices_app/public/cpp/constants.h"
+#include "mojo/application/public/cpp/connect.h"
+#include "mojo/application/public/interfaces/shell.mojom.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"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/array.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.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::Service,
+                                    base::UTF8ToUTF16(kNoServiceError))));
+}
+
+void OnGetDevicesComplete(
+    ScopedWebCallbacks<blink::WebUSBClientGetDevicesCallbacks> scoped_callbacks,
+    mojo::ServiceProvider* device_services,
+    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::DeviceManagerPtr device_manager;
+    mojo::ConnectToService(device_services, &device_manager);
+    (*devices)[i] = new WebUSBDeviceImpl(
+        device_manager.Pass(),
+        mojo::ConvertTo<blink::WebUSBDeviceInfo>(results[i]));
+  }
+  scoped_callbacks.PassCallbacks()->onSuccess(blink::adoptWebPtr(devices));
+}
+
+}  // namespace
+
+WebUSBClientImpl::WebUSBClientImpl(mojo::ServiceProviderPtr device_services)
+    : device_services_(device_services.Pass()) {
+  mojo::ConnectToService(device_services_.get(), &device_manager_);
+}
+
+WebUSBClientImpl::~WebUSBClientImpl() {}
+
+void WebUSBClientImpl::getDevices(
+    blink::WebUSBClientGetDevicesCallbacks* callbacks) {
+  auto scoped_callbacks = MakeScopedUSBCallbacks(callbacks);
+  // TODO(rockot): Remove this once DeviceManager is updated. It should no
+  // longer take enumeration options.
+  device::usb::EnumerationOptionsPtr options =
+      device::usb::EnumerationOptions::New();
+  options->filters = mojo::Array<device::usb::DeviceFilterPtr>::New(0);
+  device_manager_->GetDevices(
+      options.Pass(),
+      base::Bind(&OnGetDevicesComplete, base::Passed(&scoped_callbacks),
+                 base::Unretained(device_services_.get())));
+}
+
+void WebUSBClientImpl::requestDevice(
+    const blink::WebUSBDeviceRequestOptions& options,
+    blink::WebUSBClientRequestDeviceCallbacks* callbacks) {
+  callbacks->onError(blink::WebUSBError(blink::WebUSBError::Error::Service,
+                                        base::UTF8ToUTF16("Not implemented.")));
+  delete callbacks;
+}
+
+}  // namespace content