root/content/browser/renderer_host/media/media_stream_dispatcher_host.cc

DEFINITIONS

1. media_stream_manager_
2. StreamGenerated
3. StreamGenerationFailed
4. DeviceStopped
5. DevicesEnumerated
6. DeviceOpened
7. OnMessageReceived
8. OnChannelClosing
9. OnGenerateStream
10. OnCancelGenerateStream
11. OnStopStreamDevice
12. OnEnumerateDevices
13. OnCancelEnumerateDevices
14. OnOpenDevice
15. OnCloseDevice
16. IsURLAllowed

// 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_dispatcher_host.h"

#include "content/browser/browser_main_loop.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/common/media/media_stream_messages.h"
#include "content/common/media/media_stream_options.h"
#include "content/public/browser/render_process_host.h"
#include "url/gurl.h"

namespace content {

MediaStreamDispatcherHost::MediaStreamDispatcherHost(
    int render_process_id,
    const ResourceContext::SaltCallback& salt_callback,
    MediaStreamManager* media_stream_manager)
    : BrowserMessageFilter(MediaStreamMsgStart),
      render_process_id_(render_process_id),
      salt_callback_(salt_callback),
      media_stream_manager_(media_stream_manager) {
}

void MediaStreamDispatcherHost::StreamGenerated(
    int render_view_id,
    int page_request_id,
    const std::string& label,
    const StreamDeviceInfoArray& audio_devices,
    const StreamDeviceInfoArray& video_devices) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DVLOG(1) << "MediaStreamDispatcherHost::StreamGenerated("
           << ", {label = " << label <<  "})";

  Send(new MediaStreamMsg_StreamGenerated(
      render_view_id, page_request_id, label, audio_devices,
      video_devices));
}

void MediaStreamDispatcherHost::StreamGenerationFailed(
    int render_view_id,
    int page_request_id,
    content::MediaStreamRequestResult result) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DVLOG(1) << "MediaStreamDispatcherHost::StreamGenerationFailed("
           << ", {page_request_id = " << page_request_id <<  "}"
           << ", { result= " << result << "})";


  Send(new MediaStreamMsg_StreamGenerationFailed(render_view_id,
                                                 page_request_id,
                                                 result));
}

void MediaStreamDispatcherHost::DeviceStopped(int render_view_id,
                                              const std::string& label,
                                              const StreamDeviceInfo& device) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DVLOG(1) << "MediaStreamDispatcherHost::DeviceStopped("
           << "{label = " << label << "}, "
           << "{type = " << device.device.type << "}, "
           << "{device_id = " << device.device.id << "})";

  Send(new MediaStreamMsg_DeviceStopped(render_view_id, label, device));
}

void MediaStreamDispatcherHost::DevicesEnumerated(
    int render_view_id,
    int page_request_id,
    const std::string& label,
    const StreamDeviceInfoArray& devices) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DVLOG(1) << "MediaStreamDispatcherHost::DevicesEnumerated("
           << ", {page_request_id = " << page_request_id <<  "})";

  Send(new MediaStreamMsg_DevicesEnumerated(render_view_id, page_request_id,
                                            devices));
}

void MediaStreamDispatcherHost::DeviceOpened(
    int render_view_id,
    int page_request_id,
    const std::string& label,
    const StreamDeviceInfo& video_device) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DVLOG(1) << "MediaStreamDispatcherHost::DeviceOpened("
           << ", {page_request_id = " << page_request_id <<  "})";

  Send(new MediaStreamMsg_DeviceOpened(
      render_view_id, page_request_id, label, video_device));
}

bool MediaStreamDispatcherHost::OnMessageReceived(
    const IPC::Message& message, bool* message_was_ok) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP_EX(MediaStreamDispatcherHost, message, *message_was_ok)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_GenerateStream, OnGenerateStream)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_CancelGenerateStream,
                        OnCancelGenerateStream)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_StopStreamDevice,
                        OnStopStreamDevice)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_EnumerateDevices,
                        OnEnumerateDevices)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_CancelEnumerateDevices,
                        OnCancelEnumerateDevices)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_OpenDevice,
                        OnOpenDevice)
    IPC_MESSAGE_HANDLER(MediaStreamHostMsg_CloseDevice,
                        OnCloseDevice)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP_EX()
  return handled;
}

void MediaStreamDispatcherHost::OnChannelClosing() {
  DVLOG(1) << "MediaStreamDispatcherHost::OnChannelClosing";

  // Since the IPC channel is gone, close all requesting/requested streams.
  media_stream_manager_->CancelAllRequests(render_process_id_);
}

MediaStreamDispatcherHost::~MediaStreamDispatcherHost() {
}

void MediaStreamDispatcherHost::OnGenerateStream(
    int render_view_id,
    int page_request_id,
    const StreamOptions& components,
    const GURL& security_origin,
    bool user_gesture) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnGenerateStream("
           << render_view_id << ", "
           << page_request_id << ", ["
           << " audio:" << components.audio_requested
           << " video:" << components.video_requested
           << " ], "
           << security_origin.spec()
           << ", " << user_gesture << ")";

  if (!IsURLAllowed(security_origin))
    return;

  media_stream_manager_->GenerateStream(
      this, render_process_id_, render_view_id, salt_callback_,
      page_request_id, components, security_origin, user_gesture);
}

void MediaStreamDispatcherHost::OnCancelGenerateStream(int render_view_id,
                                                       int page_request_id) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnCancelGenerateStream("
           << render_view_id << ", "
           << page_request_id << ")";
  media_stream_manager_->CancelRequest(render_process_id_, render_view_id,
                                       page_request_id);
}

void MediaStreamDispatcherHost::OnStopStreamDevice(
    int render_view_id,
    const std::string& device_id) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnStopStreamDevice("
           << render_view_id << ", "
           << device_id << ")";
  media_stream_manager_->StopStreamDevice(render_process_id_, render_view_id,
                                          device_id);
}

void MediaStreamDispatcherHost::OnEnumerateDevices(
    int render_view_id,
    int page_request_id,
    MediaStreamType type,
    const GURL& security_origin) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnEnumerateDevices("
           << render_view_id << ", "
           << page_request_id << ", "
           << type << ", "
           << security_origin.spec() << ")";

  if (!IsURLAllowed(security_origin))
    return;

  media_stream_manager_->EnumerateDevices(
      this, render_process_id_, render_view_id, salt_callback_,
      page_request_id, type, security_origin);
}

void MediaStreamDispatcherHost::OnCancelEnumerateDevices(
    int render_view_id,
    int page_request_id) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnCancelEnumerateDevices("
           << render_view_id << ", "
           << page_request_id << ")";
  media_stream_manager_->CancelRequest(render_process_id_, render_view_id,
                                       page_request_id);
}

void MediaStreamDispatcherHost::OnOpenDevice(
    int render_view_id,
    int page_request_id,
    const std::string& device_id,
    MediaStreamType type,
    const GURL& security_origin) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnOpenDevice("
           << render_view_id << ", "
           << page_request_id << ", device_id: "
           << device_id.c_str() << ", type: "
           << type << ", "
           << security_origin.spec() << ")";

  if (!IsURLAllowed(security_origin))
    return;

  media_stream_manager_->OpenDevice(
      this, render_process_id_, render_view_id, salt_callback_,
      page_request_id, device_id, type, security_origin);
}

void MediaStreamDispatcherHost::OnCloseDevice(
    int render_view_id,
    const std::string& label) {
  DVLOG(1) << "MediaStreamDispatcherHost::OnCloseDevice("
           << render_view_id << ", "
           << label << ")";

  media_stream_manager_->CancelRequest(label);
}

bool MediaStreamDispatcherHost::IsURLAllowed(const GURL& url) {
  if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanRequestURL(
          render_process_id_, url)) {
    LOG(ERROR) << "MSDH: Renderer requested a URL it's not allowed to use.";
    return false;
  }

  return true;
}

}  // namespace content