Implement getMediaDevices.

content/browser/renderer_host/media/media_stream_manager.cc

 // Copyright (c) 2012 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_stream_manager.h"
 
 #include <list>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 143 matching lines @@
     }
   }
   return output_string;
 }
 
 // Needed for MediaStreamManager::GenerateStream below.
 std::string ReturnEmptySalt() {
   return std::string();
 }
 
+// Clears the MediaStreamDevice.name from all devices in |devices|.
+static void ClearDeviceLabels(content::StreamDeviceInfoArray* devices) {
+  for (content::StreamDeviceInfoArray::iterator device_itr = devices->begin();
+       device_itr != devices->end();
+       ++device_itr) {
+    device_itr->device.name.clear();
+  }
+}
+
 }  // namespace
 
 
 // MediaStreamManager::DeviceRequest represents a request to either enumerate
 // available devices or open one or more devices.
 // TODO(perkj): MediaStreamManager still needs refactoring. I propose we create
 // several subclasses of DeviceRequest and move some of the responsibility of
 // the MediaStreamManager to the subclasses to get rid of the way too many if
 // statements in MediaStreamManager.
 class MediaStreamManager::DeviceRequest {
  public:
   DeviceRequest(MediaStreamRequester* requester,
                 int requesting_process_id,
                 int requesting_view_id,
                 int page_request_id,
                 const GURL& security_origin,
+                bool have_permission,
                 bool user_gesture,
                 MediaStreamRequestType request_type,
                 const StreamOptions& options,
                 const ResourceContext::SaltCallback& salt_callback)
       : requester(requester),
         requesting_process_id(requesting_process_id),
         requesting_view_id(requesting_view_id),
         page_request_id(page_request_id),
         security_origin(security_origin),
+        have_permission(have_permission),
         user_gesture(user_gesture),
         request_type(request_type),
         options(options),
         salt_callback(salt_callback),
         state_(NUM_MEDIA_TYPES, MEDIA_REQUEST_STATE_NOT_REQUESTED),
         audio_type_(MEDIA_NO_SERVICE),
         video_type_(MEDIA_NO_SERVICE) {
   }
 
   ~DeviceRequest() {}
@@ skipping 101 matching lines @@
   // will receive a handle to the MediaStream. This may be different from
   // MediaStreamRequest::render_view_id which in the tab capture case
   // specifies the target renderer from which audio and video is captured.
   const int requesting_view_id;
 
   // An ID the render view provided to identify this request.
   const int page_request_id;
 
   const GURL security_origin;
 
+  // This is used when enumerating devices; if we don't have device access
+  // permission, we remove the device label.
+  bool have_permission;
+
   const bool user_gesture;
 
   const MediaStreamRequestType request_type;
 
   const StreamOptions options;
 
   ResourceContext::SaltCallback salt_callback;
 
   StreamDeviceInfoArray devices;
 
@@ skipping 84 matching lines @@
     const MediaRequestResponseCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // TODO(perkj): The argument list with NULL parameters to DeviceRequest
   // suggests that this is the wrong design. Can this be refactored?
   DeviceRequest* request = new DeviceRequest(NULL,
                                              render_process_id,
                                              render_view_id,
                                              page_request_id,
                                              security_origin,
+                                             true,
                                              false,  // user gesture
                                              MEDIA_DEVICE_ACCESS,
                                              options,
                                              base::Bind(&ReturnEmptySalt));
 
   const std::string& label = AddRequest(request);
 
   request->callback = callback;
   // Post a task and handle the request asynchronously. The reason is that the
   // requester won't have a label for the request until this function returns
@@ skipping 20 matching lines @@
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kUseFakeUIForMediaStream)) {
     UseFakeUI(scoped_ptr<FakeMediaStreamUIProxy>());
   }
 
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
                                              render_view_id,
                                              page_request_id,
                                              security_origin,
+                                             true,
                                              user_gesture,
                                              MEDIA_GENERATE_STREAM,
                                              options,
                                              sc);
 
   const std::string& label = AddRequest(request);
 
   // Post a task and handle the request asynchronously. The reason is that the
   // requester won't have a label for the request until this function returns
   // and thus can not handle a response. Using base::Unretained is safe since
@@ skipping 162 matching lines @@
   }
 }
 
 std::string MediaStreamManager::EnumerateDevices(
     MediaStreamRequester* requester,
     int render_process_id,
     int render_view_id,
     const ResourceContext::SaltCallback& sc,
     int page_request_id,
     MediaStreamType type,
-    const GURL& security_origin) {
+    const GURL& security_origin,
+    bool have_permission) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(requester);
   DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
          type == MEDIA_DEVICE_VIDEO_CAPTURE);
 
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
                                              render_view_id,
                                              page_request_id,
                                              security_origin,
+                                             have_permission,
                                              false,  // user gesture
                                              MEDIA_ENUMERATE_DEVICES,
                                              StreamOptions(),
                                              sc);
   if (IsAudioMediaType(type))
     request->SetAudioType(type);
   else if (IsVideoMediaType(type))
     request->SetVideoType(type);
 
   const std::string& label = AddRequest(request);
@@ skipping 16 matching lines @@
     return;  // This can happen if the request has been canceled.
 
   MediaStreamType type;
   EnumerationCache* cache;
   if (request->audio_type() == MEDIA_DEVICE_AUDIO_CAPTURE) {
     DCHECK_EQ(MEDIA_NO_SERVICE, request->video_type());
     type = MEDIA_DEVICE_AUDIO_CAPTURE;
     cache = &audio_enumeration_cache_;
   } else {
     DCHECK_EQ(MEDIA_DEVICE_VIDEO_CAPTURE, request->video_type());
+    DCHECK_EQ(MEDIA_NO_SERVICE, request->audio_type());
     type = MEDIA_DEVICE_VIDEO_CAPTURE;
     cache = &video_enumeration_cache_;
   }
 
   if (!EnumerationRequired(cache, type)) {
     // Cached device list of this type exists. Just send it out.
     request->SetState(type, MEDIA_REQUEST_STATE_REQUESTED);
     request->devices = cache->devices;
     FinalizeEnumerateDevices(label, request);
   } else {
@@ skipping 24 matching lines @@
     options.mandatory_video.push_back(
         StreamOptions::Constraint(kMediaStreamSourceInfoId, device_id));
   } else {
     NOTREACHED();
   }
   DeviceRequest* request = new DeviceRequest(requester,
                                              render_process_id,
                                              render_view_id,
                                              page_request_id,
                                              security_origin,
+                                             true,
                                              false,  // user gesture
                                              MEDIA_OPEN_DEVICE,
                                              options,
                                              sc);
 
   const std::string& label = AddRequest(request);
   // Post a task and handle the request asynchronously. The reason is that the
   // requester won't have a label for the request until this function returns
   // and thus can not handle a response. Using base::Unretained is safe since
   // MediaStreamManager is deleted on the UI thread, after the IO thread has
@@ skipping 631 matching lines @@
 
   if (request->security_origin.is_valid()) {
     for (StreamDeviceInfoArray::iterator it = request->devices.begin();
          it != request->devices.end(); ++it) {
       TranslateDeviceIdToSourceId(request, &it->device);
     }
   } else {
     request->devices.clear();
   }
 
+  if (!request->have_permission)
+    ClearDeviceLabels(&request->devices);
+
   request->requester->DevicesEnumerated(
       request->requesting_view_id,
       request->page_request_id,
       label,
       request->devices);
 
   // TODO(tommi):
   // Ideally enumeration requests should be deleted once they have been served
   // (as any request).  However, this implementation mixes requests and
   // notifications together so enumeration requests are kept open by some
@@ skipping 540 matching lines @@
       if (it->device.type == MEDIA_DESKTOP_VIDEO_CAPTURE) {
         video_capture_manager_->SetDesktopCaptureWindowId(it->session_id,
                                                           window_id);
         break;
       }
     }
   }
 }
 
 }  // namespace content