extensions/shell/browser/media_capture_util.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/shell/browser/media_capture_util.h"
   6
   7 #include <string>
   8
   9 #include "base/callback.h"
  10 #include "base/logging.h"
  11 #include "content/public/browser/media_capture_devices.h"
  12 #include "extensions/common/permissions/permissions_data.h"
  13
  14 using content::MediaCaptureDevices;
  15 using content::MediaStreamDevice;
  16 using content::MediaStreamDevices;
  17 using content::MediaStreamUI;
  18
  19 namespace extensions {
  20
  21 const MediaStreamDevice* GetRequestedDeviceOrDefault(
  22     const MediaStreamDevices& devices,
  23     const std::string& requested_device_id) {
  24   if (!requested_device_id.empty())
  25     return devices.FindById(requested_device_id);
  26
  27   if (!devices.empty())
  28     return &devices[0];
  29
  30   return NULL;
  31 }
  32
  33 namespace media_capture_util {
  34
  35 // See also Chrome's MediaCaptureDevicesDispatcher.
  36 void GrantMediaStreamRequest(content::WebContents* web_contents,
  37                              const content::MediaStreamRequest& request,
  38                              const content::MediaResponseCallback& callback,
  39                              const Extension* extension) {
  40   // app_shell only supports audio and video capture, not tab or screen capture.
  41   DCHECK(request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE ||
  42          request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE);
  43
  44   MediaStreamDevices devices;
  45
  46   if (request.audio_type == content::MEDIA_DEVICE_AUDIO_CAPTURE) {
  47     VerifyMediaAccessPermission(request.audio_type, extension);
  48     const MediaStreamDevice* device = GetRequestedDeviceOrDefault(
  49         MediaCaptureDevices::GetInstance()->GetAudioCaptureDevices(),
  50         request.requested_audio_device_id);
  51     if (device)
  52       devices.push_back(*device);
  53   }
  54
  55   if (request.video_type == content::MEDIA_DEVICE_VIDEO_CAPTURE) {
  56     VerifyMediaAccessPermission(request.video_type, extension);
  57     const MediaStreamDevice* device = GetRequestedDeviceOrDefault(
  58         MediaCaptureDevices::GetInstance()->GetVideoCaptureDevices(),
  59         request.requested_video_device_id);
  60     if (device)
  61       devices.push_back(*device);
  62   }
  63
  64   // TODO(jamescook): Should we show a recording icon somewhere? If so, where?
  65   scoped_ptr<MediaStreamUI> ui;
  66   callback.Run(devices,
  67                devices.empty() ? content::MEDIA_DEVICE_INVALID_STATE
  68                                : content::MEDIA_DEVICE_OK,
  69                ui.Pass());
  70 }
  71
  72 void VerifyMediaAccessPermission(content::MediaStreamType type,
  73                                  const Extension* extension) {
  74   const PermissionsData* permissions_data = extension->permissions_data();
  75   if (type == content::MEDIA_DEVICE_AUDIO_CAPTURE) {
  76     // app_shell has no UI surface to show an error, and on an embedded device
  77     // it's better to crash than to have a feature not work.
  78     CHECK(permissions_data->HasAPIPermission(APIPermission::kAudioCapture))
  79         << "Audio capture request but no audioCapture permission in manifest.";
  80   } else {
  81     DCHECK(type == content::MEDIA_DEVICE_VIDEO_CAPTURE);
  82     CHECK(permissions_data->HasAPIPermission(APIPermission::kVideoCapture))
  83         << "Video capture request but no videoCapture permission in manifest.";
  84   }
  85 }
  86
  87 }  // namespace media_capture_util
  88 }  // namespace extensions