Migrate MediaDevices.enumerateDevices to Mojo

content/browser/renderer_host/media/media_devices_dispatcher_host.cc

Index: content/browser/renderer_host/media/media_devices_dispatcher_host.cc
diff --git a/content/browser/renderer_host/media/media_devices_dispatcher_host.cc b/content/browser/renderer_host/media/media_devices_dispatcher_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..43983733f3ed761e1e3cdfcdc42861a3ea2dcc6c
--- /dev/null
+++ b/content/browser/renderer_host/media/media_devices_dispatcher_host.cc
@@ -0,0 +1,223 @@
+// Copyright 2016 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/browser/renderer_host/media/media_devices_dispatcher_host.h"
+
+#include <utility>
+#include <vector>
+
+#include "base/bind_helpers.h"
+#include "base/memory/ptr_util.h"
+#include "content/browser/bad_message.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
+#include "content/browser/renderer_host/media/media_stream_ui_proxy.h"
+#include "content/common/media/media_devices.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/media_device_id.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/resource_context.h"
+#include "content/public/common/media_stream_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/shell/public/cpp/interface_provider.h"
+#include "url/origin.h"
+
+namespace content {
+
+namespace {
+
+MediaDeviceInfo TranslateDeviceInfo(bool has_permission,
+                                    const std::string& device_id_salt,
+                                    const std::string& group_id_salt,
+                                    const url::Origin& security_origin,
+                                    const MediaDeviceInfo& device_info) {
+  return MediaDeviceInfo(
+      GetHMACForMediaDeviceID(device_id_salt, security_origin,
+                              device_info.device_id),
+      has_permission ? device_info.label : std::string(),
+      device_info.group_id.empty()
+          ? std::string()
+          : GetHMACForMediaDeviceID(group_id_salt, security_origin,
+                                    device_info.group_id));
+}
+
+}  // namespace
+
+// static
+void MediaDevicesDispatcherHost::Create(
+    int render_process_id,
+    int routing_id,
+    const std::string& device_id_salt,
+    MediaStreamManager* media_stream_manager,
+    bool use_fake_ui,
+    ::mojom::MediaDevicesDispatcherHostRequest request) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  mojo::MakeStrongBinding(base::MakeUnique<MediaDevicesDispatcherHost>(
+                              render_process_id, routing_id, device_id_salt,
+                              media_stream_manager, use_fake_ui),
+                          std::move(request));
+}
+
+MediaDevicesDispatcherHost::MediaDevicesDispatcherHost(
+    int render_process_id,
+    int routing_id,
+    const std::string& device_id_salt,
+    MediaStreamManager* media_stream_manager,
+    bool use_fake_ui)
+    : render_process_id_(render_process_id),
+      routing_id_(routing_id),
+      device_id_salt_(device_id_salt),
+      group_id_salt_(ResourceContext::CreateRandomMediaDeviceIDSalt()),
+      media_stream_manager_(media_stream_manager),
+      use_fake_ui_(use_fake_ui),
+      weak_factory_(this) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+MediaDevicesDispatcherHost::~MediaDevicesDispatcherHost() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void MediaDevicesDispatcherHost::EnumerateDevices(
+    bool request_audio_input,
+    bool request_video_input,
+    bool request_audio_output,
+    const url::Origin& security_origin,
+    const EnumerateDevicesCallback& client_callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  if (!request_audio_input && !request_video_input && !request_audio_output) {
+    bad_message::ReceivedBadMessage(render_process_id_,
+                                    bad_message::MDDH_INVALID_DEVICE_TYPE);

[hta - Chromium, 2016/09/30 08:38:12]

Given that this is what the error means, should it be called
MDDH_INVALID_DEVICE_TYPE_REQUEST?

[Guido Urdaneta, 2016/10/07 17:07:13]

Done.

+    return;
+  }
+
+  if (!MediaStreamManager::IsOriginAllowed(render_process_id_,
+                                           security_origin)) {
+    bad_message::ReceivedBadMessage(render_process_id_,
+                                    bad_message::MDDH_UNAUTHORIZED_ORIGIN);
+    return;
+  }
+
+  MediaDevicesManager::BoolDeviceTypes devices_to_enumerate;
+  devices_to_enumerate[MEDIA_DEVICE_TYPE_AUDIO_INPUT] = request_audio_input;
+  devices_to_enumerate[MEDIA_DEVICE_TYPE_VIDEO_INPUT] = request_video_input;
+  devices_to_enumerate[MEDIA_DEVICE_TYPE_AUDIO_OUTPUT] = request_audio_output;
+
+  // This callback is run after permissions are checked.
+  AccessCheckedCallback access_checked_callback =
+      base::Bind(&MediaDevicesDispatcherHost::DoEnumerateDevices,
+                 weak_factory_.GetWeakPtr(), devices_to_enumerate,
+                 security_origin, client_callback);
+
+  std::unique_ptr<MediaStreamUIProxy> ui_proxy = GetUIProxy();
+
+  // The permission type MEDIA_DEVICE_AUDIO_CAPTURE is currently used for both
+  // audio input and output. TODO(guidou): use specific permission for audio

[hta - Chromium, 2016/09/30 08:38:12]

New line for TODO?

[Guido Urdaneta, 2016/10/07 17:07:13]

Done.

+  // output when it becomes available. See http://crbug.com/556542.
+  bool request_audio = request_audio_input || request_audio_output;
+  if (request_audio) {
+    ui_proxy->CheckAccess(
+        security_origin, MEDIA_DEVICE_AUDIO_CAPTURE, render_process_id_,
+        routing_id_, base::Bind(&MediaDevicesDispatcherHost::AudioAccessChecked,
+                                weak_factory_.GetWeakPtr(),
+                                base::Passed(&ui_proxy), request_video_input,
+                                security_origin, access_checked_callback));
+    return;
+  }
+
+  DCHECK(request_video_input);
+  ui_proxy->CheckAccess(
+      security_origin, MEDIA_DEVICE_VIDEO_CAPTURE, render_process_id_,
+      routing_id_,
+      base::Bind(&MediaDevicesDispatcherHost::VideoAccessChecked,
+                 weak_factory_.GetWeakPtr(), base::Passed(&ui_proxy),
+                 false /* has_audio_permission */, access_checked_callback));
+}
+
+void MediaDevicesDispatcherHost::AudioAccessChecked(
+    std::unique_ptr<MediaStreamUIProxy> ui_proxy,
+    bool check_video_permission,
+    const url::Origin& security_origin,
+    AccessCheckedCallback callback,
+    bool has_audio_permission) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (check_video_permission) {
+    ui_proxy->CheckAccess(
+        security_origin, MEDIA_DEVICE_VIDEO_CAPTURE, render_process_id_,
+        routing_id_,
+        base::Bind(&MediaDevicesDispatcherHost::VideoAccessChecked,
+                   weak_factory_.GetWeakPtr(), base::Passed(&ui_proxy),
+                   has_audio_permission, callback));
+    return;
+  }
+
+  MediaDevicesManager::BoolDeviceTypes permissions;
+  permissions[MEDIA_DEVICE_TYPE_AUDIO_INPUT] = has_audio_permission;
+  permissions[MEDIA_DEVICE_TYPE_AUDIO_OUTPUT] = has_audio_permission;
+  callback.Run(permissions);
+}
+
+void MediaDevicesDispatcherHost::VideoAccessChecked(
+    std::unique_ptr<MediaStreamUIProxy> ui_proxy,
+    bool has_audio_permission,
+    AccessCheckedCallback callback,
+    bool has_video_permission) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  MediaDevicesManager::BoolDeviceTypes permissions;
+  permissions[MEDIA_DEVICE_TYPE_AUDIO_INPUT] = has_audio_permission;
+  permissions[MEDIA_DEVICE_TYPE_AUDIO_OUTPUT] = has_audio_permission;
+  permissions[MEDIA_DEVICE_TYPE_VIDEO_INPUT] = has_video_permission;
+  callback.Run(permissions);
+}
+
+void MediaDevicesDispatcherHost::DoEnumerateDevices(
+    const MediaDevicesManager::BoolDeviceTypes& requested_types,
+    const url::Origin& security_origin,
+    const EnumerateDevicesCallback& client_callback,
+    const MediaDevicesManager::BoolDeviceTypes& has_permissions) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  media_stream_manager_->media_devices_manager()->EnumerateDevices(
+      requested_types,
+      base::Bind(&MediaDevicesDispatcherHost::DevicesEnumerated,
+                 weak_factory_.GetWeakPtr(), requested_types, security_origin,
+                 client_callback, has_permissions));
+}
+
+void MediaDevicesDispatcherHost::DevicesEnumerated(
+    const MediaDevicesManager::BoolDeviceTypes& requested_types,
+    const url::Origin& security_origin,
+    const EnumerateDevicesCallback& client_callback,
+    const MediaDevicesManager::BoolDeviceTypes& has_permissions,
+    const MediaDeviceEnumeration& enumeration) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  std::vector<std::vector<MediaDeviceInfo>> result(NUM_MEDIA_DEVICE_TYPES);
+  for (size_t i = 0; i < NUM_MEDIA_DEVICE_TYPES; ++i) {
+    if (!requested_types[i])
+      continue;
+
+    for (const auto& device_info : enumeration[i]) {
+      result[i].push_back(TranslateDeviceInfo(has_permissions[i],
+                                              device_id_salt_, group_id_salt_,
+                                              security_origin, device_info));
+    }
+  }
+  client_callback.Run(result);
+}
+
+std::unique_ptr<MediaStreamUIProxy> MediaDevicesDispatcherHost::GetUIProxy() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (use_fake_ui_) {
+    return fake_ui_proxy_ ? std::move(fake_ui_proxy_)
+                          : base::MakeUnique<FakeMediaStreamUIProxy>();
+  }
+  return MediaStreamUIProxy::Create();
+}
+
+void MediaDevicesDispatcherHost::SetFakeUIProxy(
+    std::unique_ptr<MediaStreamUIProxy> fake_ui_proxy) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  fake_ui_proxy_ = std::move(fake_ui_proxy);
+}
+
+}  // namespace content